Electric sewing machine

Claim 2

A sewing machine, comprising: a frame; a main shaft rotatably mounted on said frame; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; stitch-forming instrumentalities mounted on said frame; at least one regulator for influencing the operation of said stitch-forming instrumentalities; a manual knob operatively connected with each of said at least one regulator for optionally setting said regulator in a desired condition; a single manually operable member, movably mounted on said frame and operatively connected with said motor driving circuit, for actuating said motor driving circuit to control running and stopping of the machine, said single member being movable among first, second and third positions; stopping means for disengaging said motor driving circuit when said single member is in the first position; and running means for actuating said motor driving circuit for running of the machine when said single member is in the second or third position, said running means including first connecting means for causing the machine to be run under the optionally set conditions of said regulator, as set by said manual knob, when said single member is in the second position, and second connecting means for changing the condition of said regulator from said condition optionally set by said manual knob to a predetermined condition set independently of and without interference with the operation of said manual knob, when said single member is in the third position, whereby any one of the three operations of 1) the stopping of the machine, 2) the running of the machine under the optionally set condition of said regulator, and 3) the running of the machine under the predetermined condition of said regulator is selectively performed according to the moving of said single manually operable member into one of three different positions.

Claim 3

A sewing machine according to claim 1, further comprising: speed-setting means connected to said motor driving circuit and providing a plurality of different operative conditions for setting the speed of said motor; and manual means operatively interconnected to said speed-setting means for selecting one of said operative conditions to optionally set the speed of said motor; wherein second said connecting means includes a linkage connecting said speed-setting means with said single manually operable member for changing the speed of said motor from said optionally set speed to a predetermined speed set independently of and without interference with said manual means, upon the shifting of said single member to the third position, whereby at the second position of said single member the machine is run at a speed of said motor optionally set by said manual means under an optionally set condition of said regulator, and at the third position of said single member the machine is run at predetermined speed of said motor under the predetermined condition of said regulator.

Claim 4

A sewing machine according to claim 1, wherein the second position of the single manually operable member exists between the first and the third positons thereof, and further comprising: urging means for biasing said single member to the first position; and program means operatively associated with said single member for permitting the moving thereof among the three positions in a programmed sequence, said program means including holding means for holding said single member in the second position against the action of said urging means when said single member has been moved directly from said first position to the third position, through the second position, and subsequently has been released from the third position, and actuating means for returning said single member directly to the first position when said single member has been moved from a position of having been held in the second position to the third position and subsequently has been released from the third position.

Claim 5

A sewing machine according to claim 3, further comprising: means for releasing the action of said holding means upon the direct shifting of said single member to the first position from the second position in which said single member has been held by said holding means.

Claim 6

A sewing machine, comprising: a frame; a main shaft rotatably mounted on said frame; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; speed-setting means connected to said circuit for setting the speed of said motor and including a plurality of selector switches; manual means including a plurality of push buttons corresponding in number to said selector switches, said push buttons being respectively connected to said selector switches for optionally pre-setting the speed of said motor; a single manually operable member, movably mounted on said frame and operatively connected with said motor driving circuit, for actuating said motor driving circuit to control running and stopping of the machine, said single member being movable among first, second and third positions; stopping means for disengaging said motor driving circuit when said single member is in the first position; and running means for actuating said motor driving circuit for running of the machine when said single member is in the second or third position, said running means including first connecting means for causing the machine to be run under the optionally set condition of said speed-setting means, as set by said manual means, when said single member is in the second position, and second connecting means for changing the condition of of said speed-setting means from the condition optionally set by said manual means to a predetermined low-speed condition set independently of and without interference with the operation of said manual means, when said single member is in the third position, whereby any one of the three operations of 1) stopping of the machine, 2) the running of the machine at the speed of said motor optionally set by said manual means, and 3) the running of the machine at the predetermined low speed of said motor by means of said connecting means, is selectively performed according to the moving of said single manually operable member into one of three different positions.

Claim 7

A sewing machine, comprising: a frame; a main shaft rotatably mounted on said frame; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; speed-setting means connected to said circuit for setting the speed of said motor and including a plurality of selector switches; manual means including a plurality of push buttons corresponding in number to said selector switches, said push buttons being respectively connected to said selector switches for optionally pre-setting the speed of said motor; a single manually operable member, movably mounted on said frame and operatively connected with said motor driving circuit, for actuating said motor driving circuit to control running and stopping of the machine, said single member being movable among first, second and third positions; stopping means for disengaging said motor driving circuit when said single member is in the first position; and running means for actuating said motor driving circuit for running of the machine when said single member is in the second or third position, said running means including first connecting means for causing the machine to be run under the optionally set condition of said speed-setting means, as set by said manual means, when said single member is in the second position, and second connecting means for changing the condition of of said speed-setting means from the condition optionally set by said manual means to a predetermined low-speed condition set independently of and without interference with the operation of said manual means, when said single member is in the third position, whereby any one of the three operations of 1) stopping of the machine, 2) the running of the machine at the speed of said motor optionally set by said manual means, and 3) the running of the machine at the predetermined low speed of said motor by means of said connecting means, is selectively performed according to the moving of said single manually operable member into one of three different positions.

Claim 8

A sewing machine, comprising: a frame; a needle bar carried by said frame for lateral oscillation and for endwise reciprocation; a feed dog movably mounted in cooperation with said needle bar; a main shaft rotatably mounted on said frame for actuating said needle bar and said feed dog; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; an amplitude regulator for regulating the amplitude of lateral oscillation imparted to said needle bar; a first manual knob operatively connected with said amplitude regulator for optionally setting said amplitude regulator in a desired condition; a feed regulator for regulating the length and direction of feed movement of said feed dog; a second manual knob operatively connected with said feed regulator for optionally setting said feed regulator in a desired condition; a single manually operable member movably mounted on said frame and operatively connected with said motor driving circuit, for actuating said motor driving circuit to control running and stopping of the machine, said single member being movable among first, second and third positions; stopping means for disengaging said motor driving circuit when said single member is in the first position; and running means for actuating said motor driving circuit for running the machine when said single member is in the second or third position, said running means including first connecting means for causing the machine to be run under the optionally set conditions of said amplitude and feed regulators, as set by said first and second manual knobs, when said single member is in the second position, and second connecting means for changing the condition of of said amplitude and feed regulators from said conditions optionally set by said first and second manual knobs to predetermined conditions set independently of and without interference with the operation of said first and second manual knobs, when said single member is in the third position, whereby any one of the three operations of 1) the stopping of the machine, 2) zigzag stitching with the amplitude and feed length optionally set by said first and second manual knobs, and 3) straight stitching with fine feed length, is selectively performed according to the moving of said single manually operable member into one of three different conditions.

Claim 9

A sewing machine, comprising: a frame; a needle bar carried by said frame for lateral oscillation and for endwise reciprocation; a feed dog movably mounted in cooperation with said needle bar; a main shaft rotatably mounted on said frame for actuating said needle bar and said feed dog; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; an amplitude regulator for regulating the amplitude of lateral oscillation imparted to said needle bar; a first manual knob operatively connected with said amplitude regulator for optionally setting said amplitude regulator in a desired condition; a feed regulator for regulating the length and direction of feed movement of said feed dog; a second manual knob operatively connected with said feed regulator for optionally setting said feed regulator in a desired condition; a single manually operable member movably mounted on said frame and operatively connected with said motor driving circuit, for actuating said motor driving circuit to control running and stopping of the machine, said single member being movable among first, second and third positions; stopping means for disengaging said motor driving circuit when said single member is in the first position; and running means for actuating said motor driving circuit for running the machine when said single member is in the second or third position, said running means including first connecting means for causing the machine to be run under the optionally set conditions of said amplitude and feed regulators, as set by said first and second manual knobs, when said single member is in the second position, and second connecting means for changing the condition of of said amplitude and feed regulators from said conditions optionally set by said first and second manual knobs to predetermined conditions set independently of and without interference with the operation of said first and second manual knobs, when said single member is in the third position, whereby any one of the three operations of 1) the stopping of the machine, 2) zigzag stitching with the amplitude and feed length optionally set by said first and second manual knobs, and 3) straight stitching with fine feed length, is selectively performed according to the moving of said single manually operable member into one of three different conditions.

Claim 10

A sewing machine according to claim 6, further comprising: speed-setting means connected to said motor-driving circuit for selecting the speed of said motor and including a plurality of selector switches; and a plurality of push buttons corresponding in number to said selector switches, said push buttons being mounted on the outside of said frame and being operatively connected to said selector switches, respectively, for optionally presetting the speed of said motor; wherein second said connecting means includes a linkage means connecting said single member with said speed-setting means for changing the speed of said motor from said speed optionally set by said push buttons to a predetermined low speed set independently of and without interference with said push buttons, when said single member is in the third position, whereby the straight stitching with the fine feed length is performed at low speed upon the moving of said single member into the third position.

Claim 11

A sewing machine, comprising: a frame; a needle bar carried by said frame for lateral oscillation and for endwise reciprocation; a main shaft rotatably mounted on said frame for actuating said needle bar; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; an amplitude regulator for regulating the amplitude of lateral oscillation imparted to said needle bar; a first manual knob operatively connected with said amplitude regulator for optionally setting said amplitude regulator in a desired condition; a single manually operable member movably mounted on said frame and operatively connected with said motor driving circuit, for actuating said motor driving circuit to control running and stopping of the machine, said single member being movable among first, second and third positions; program means operatively associated with said single member for permitting moving thereof among the three positions in a programmed sequence; urging means for biasing said single member to the first position; said program means including holding means for holding said single member in the second position against the action of said urging means when said single member has been moved directly from said first position to the third position, through the second position, and subsequently has been released from the third position, and actuating means for returning said single member directly to the first position when said single member has been moved from a position of having been held in the second position to the third position and subsequently has been released from the third position; stopping means for disengaging said motor driving circuit when said single member is in the first position; and running means for actuating said motor driving circuit for running the machine when said single member is in the second or third position, said running means including first connecting means for causing the machine to be run under the optionally set conditions of said amplitude regulator, as set by said first manual knob, when said single member is in the second position, and second connecting means for changing the condition of of said amplitude regulator from the condition optionally set by said first manual knob to a condition for non-oscillation of said needle bar set independently of and without interference with the operation of said first manual knob, when said single member is in the third position, whereby any one of the three operations of 1) the stopping of the machine, 2) zigzag stitching with the amplitude optionally set by said first manual knob, and 3) straight stitching, is selectively performed according to the shifting of said single manually operable member into one of three different conditions.

Claim 12

A sewing machine, comprising: a frame; a needle bar carried by said frame for lateral oscillation and for endwise reciprocation; a main shaft rotatably mounted on said frame for actuating said needle bar; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; an amplitude regulator for regulating the amplitude of lateral oscillation imparted to said needle bar; a first manual knob operatively connected with said amplitude regulator for optionally setting said amplitude regulator in a desired condition; a single manually operable member movably mounted on said frame and operatively connected with said motor driving circuit, for actuating said motor driving circuit to control running and stopping of the machine, said single member being movable among first, second and third positions; program means operatively associated with said single member for permitting moving thereof among the three positions in a programmed sequence; urging means for biasing said single member to the first position; said program means including holding means for holding said single member in the second position against the action of said urging means when said single member has been moved directly from said first position to the third position, through the second position, and subsequently has been released from the third position, and actuating means for returning said single member directly to the first position when said single member has been moved from a position of having been held in the second position to the third position and subsequently has been released from the third position; stopping means for disengaging said motor driving circuit when said single member is in the first position; and running means for actuating said motor driving circuit for running the machine when said single member is in the second or third position, said running means including first connecting means for causing the machine to be run under the optionally set conditions of said amplitude regulator, as set by said first manual knob, when said single member is in the second position, and second connecting means for changing the condition of of said amplitude regulator from the condition optionally set by said first manual knob to a condition for non-oscillation of said needle bar set independently of and without interference with the operation of said first manual knob, when said single member is in the third position, whereby any one of the three operations of 1) the stopping of the machine, 2) zigzag stitching with the amplitude optionally set by said first manual knob, and 3) straight stitching, is selectively performed according to the shifting of said single manually operable member into one of three different conditions.

Claim 13

A sewing machine according to claim 8, further comprising: a feed dog movably mounted on said frame and actuated by said main shaft in cooperation with said needle bar; a feed regulator for regulating the length and direction of feed movement of said feed dog; and a second manual knob operatively connected with said feed regulator for optionally setting said feed regulator in a desired condition; wherein second said connecting means includes linkage means for connecting said single member with said feed regulator for changing the condition of said feed regulator from said condition optionally set by said second manual knob to a predetermined condition for a fine feed movement of said feed dog set independently of and without interference with the operation of said second manual knob, when said single member is in the third position, whereby at the second position of said single member, zigzag stitching with the amplitude and the feed length optionally set by said first and second manual knobs, and at the third position of the single member straight stitching with the fine feed length are selectively performed.

Claim 14

A sewing machine according to claim 9, further comprising: speed-setting means connected to said motor driving circuit for selecting the speed of said motor and including a plurality of selector switches; and a plurality of push buttons corresponding in number to said selector switches, said push buttons being mounted on the outside of said frame and being operatively connected to said selector switches, respectively, for optionally presetting the speed of said motor; wherein second said connecting means includes a further linkage means connecting said single member with said speed-setting means for changing the speed of said motor from said speed optionally set by said push buttons to a predetermined low speed set independently of and without interference with said push buttons, when said single member is in the third position, whereby at the second position of said single member zigzag stitching at the optionally pre-set speed, and at the third position of said single member straight stitching at the predetermined low speed are selectively performed.

Claim 15

A sewing machine, comprising: a frame; a main shaft rotatably mounted on said frame; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; stitch-forming instrumentalities mounted on said frame; at least one regulator for influencing the operation of said stitch-forming instrumentalities; a manual knob operatively connected with said regulator for optionally setting said regulator in a desired condition; a single manually operable member shiftably mounted on said frame and operatively connected with said motor driving circuit for actuating said motor driving circuit to control running and stopping of the machine; means for positioning said single manually operable member selectively in one of three different positions, the first position for stopping the machine, and the second and the third positions both for running the machine; and means for operatively connecting said single manually operable member with said regulator for changing the condition of said regulator from said optionally set condition to a predetermined condition set independently of and without interference with the operation of said manual knob, upon the shifting of said single manually operable member into the third position, whereby any one of the following three operations, i.e., the stopping of the machine, the running of the machine under the optionally set condition of said regulator, and the running of the machine under the predetermined condition of said regulator, is selectively performed according to the shifting of said single manually operable member into one of three different position.

Claim 16

A sewing machine, comprising: a frame; a main shaft rotatably mounted on said frame; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; stitch-forming instrumentalities mounted on said frame; at least one regulator for influencing the operation of said stitch-forming instrumentalities; a manual knob operatively connected with said regulator for optionally setting said regulator in a desired condition; a single manually operable member shiftably mounted on said frame and operatively connected with said motor driving circuit for actuating said motor driving circuit to control running and stopping of the machine; means for positioning said single manually operable member selectively in one of three different positions, the first position for stopping the machine, and the second and the third positions both for running the machine; and means for operatively connecting said single manually operable member with said regulator for changing the condition of said regulator from said optionally set condition to a predetermined condition set independently of and without interference with the operation of said manual knob, upon the shifting of said single manually operable member into the third position, whereby any one of the following three operations, i.e., the stopping of the machine, the running of the machine under the optionally set condition of said regulator, and the running of the machine under the predetermined condition of said regulator, is selectively performed according to the shifting of said single manually operable member into one of three different position.

Claim 17

A sewing machine according to claim 11, wherein the second position of the single manually operable member exists between the first and the third position thereof, and further comprising: urging means for biasing said single member to the first position; and program means operatively associated with said single member for permitting the moving thereof among the three positions in a programmed sequence, said program means including holding means for holding said single member in the second position against the action of said urging means when said single member has been moved directly from said first position to the third position, through the second position, and subsequently has been released from the third position, and actuating means for returning said single member directly to the first position when said single memeber has been moved from a position of having been held in the second position to the third position and subsequently has been released from the third position.

Claim 18

A sewing machine, comprising: a frame; a main shaft rotatably mounted on said frame; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; speed-setting means connected to said circuit for setting the speed of said motor and including a plurality of selector switches; manual means including a plurality of push buttons corresponding in number to said selector switches, said push buttons being respectively connected to said selector switches for optionally pre-setting the speed of said motor; a single manually operable member shiftably mounted on said frame and operatively connected with said motor driving circuit for actuating said motor driving circuit to control running and stopping of the machine; means for positioning said single manually operable member selectively in each one of three different positions, the first position for stopping the machine, the second position for running the machine at the pre-set speed of said motor, and the third position for running the machine at another speed of said motor; and means for operatively connecting said single manually operable member with said speed-setting means for changing the speed of the motor from said optionally pre-set speed to a predetermined low speed set independently of and without interference with said manual means, upon the shifting of said operable member into the third position, whereby any one of the following three operations, i.e., the stopping of the machine, the running of the machine at the optionally pre-set speed of the motor, and the running of the machine at the predetermine low speed of the motor is selectively performed according to the shifting of the single manually operable member into one of the three different positions.

Claim 19

A sewing machine, comprising: a frame; a main shaft rotatably mounted on said frame; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; speed-setting means connected to said circuit for setting the speed of said motor and including a plurality of selector switches; manual means including a plurality of push buttons corresponding in number to said selector switches, said push buttons being respectively connected to said selector switches for optionally pre-setting the speed of said motor; a single manually operable member shiftably mounted on said frame and operatively connected with said motor driving circuit for actuating said motor driving circuit to control running and stopping of the machine; means for positioning said single manually operable member selectively in each one of three different positions, the first position for stopping the machine, the second position for running the machine at the pre-set speed of said motor, and the third position for running the machine at another speed of said motor; and means for operatively connecting said single manually operable member with said speed-setting means for changing the speed of the motor from said optionally pre-set speed to a predetermined low speed set independently of and without interference with said manual means, upon the shifting of said operable member into the third position, whereby any one of the following three operations, i.e., the stopping of the machine, the running of the machine at the optionally pre-set speed of the motor, and the running of the machine at the predetermine low speed of the motor is selectively performed according to the shifting of the single manually operable member into one of the three different positions.

Claim 20

A sewing machine, comprising: a frame; a needle bar carried by said frame for lateral oscillation and for endwise reciprocation; a feed dog movably mounted in cooperation with said needle bar; a main shaft rotatably mounted on said frame for actuating said needle bar and said feed dog; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; an amplitude regulator for regulating the amplitude of lateral oscillation imparted to said needle bar; a first manual knob operatively connected with said amplitude regulator for optionally setting said amplitude regulator in a desired condition; a feed regulator for regulating the length and direction of feed movement of said feed dog; a second manual knob operatively connected with said feed regulator for optionally setting said feed regulator in a desired condition; a single manually operable member shiftably mounted on said frame and operatively connected with said motor driving circuit, for actuating said motor driving circuit to control running and stopping of the machine; means for positioning said single manually operable member selectively in each one of three different positions, the first position providing the stopping of the machine, and the second and third positions providing the running of the machine; and means for operatively connecting said single manually operable member with said amplitude and feed regulators for changing each condition of the regulators from said each optionally set condition to a condition for non-oscillation of said needle bar and to a condition for a fine feed movement of said feed dog, respectively, independently of and without interference with said first and second manual knobs upon the shifting of said single manually operable member into the third position, whereby zigzag stitching with the amplitude and feed length optionally set by the manual knobs, straight stitching with the fine feed length, and the stopping of the sewing operation are selectively performed according to the shifting of said single manually operable member into one of said three different positions.

Claim 21

A sewing machine, comprising: a frame; a needle bar carried by said frame for lateral oscillation and for endwise reciprocation; a feed dog movably mounted in cooperation with said needle bar; a main shaft rotatably mounted on said frame for actuating said needle bar and said feed dog; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; an amplitude regulator for regulating the amplitude of lateral oscillation imparted to said needle bar; a first manual knob operatively connected with said amplitude regulator for optionally setting said amplitude regulator in a desired condition; a feed regulator for regulating the length and direction of feed movement of said feed dog; a second manual knob operatively connected with said feed regulator for optionally setting said feed regulator in a desired condition; a single manually operable member shiftably mounted on said frame and operatively connected with said motor driving circuit, for actuating said motor driving circuit to control running and stopping of the machine; means for positioning said single manually operable member selectively in each one of three different positions, the first position providing the stopping of the machine, and the second and third positions providing the running of the machine; and means for operatively connecting said single manually operable member with said amplitude and feed regulators for changing each condition of the regulators from said each optionally set condition to a condition for non-oscillation of said needle bar and to a condition for a fine feed movement of said feed dog, respectively, independently of and without interference with said first and second manual knobs upon the shifting of said single manually operable member into the third position, whereby zigzag stitching with the amplitude and feed length optionally set by the manual knobs, straight stitching with the fine feed length, and the stopping of the sewing operation are selectively performed according to the shifting of said single manually operable member into one of said three different positions.

Claim 22

A sewing machine, comprising: a frame; a needle bar carried by said frame for lateral oscillation and for endwise reciprocation; a main shaft rotatably mounted on said frame for actuating said needle bar; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; an amplitude regulator for regulating the amplitude of lateral oscillation imparted to said needle bar; a first knob operatively connected with said amplitude regulator for optionally setting said amplitude regulator in a desired condition; a single manually operable member, shiftably mounted on said frame and operatively connected with said motor driving circuit, for actuating said motor driving circuit to control running and stopping of the machine; program means operatively associated wih said single manually operable member and effective for positioning the single manually operable member selectively in each one of three different positions and for shifting the single manually operable member among the three positions in a programmed sequence, the first position providing the stopping of the machine the second position providing the running of the machine under the optionally set condition of said amplitude regulator, and the third position providing the running of the machine under another condition of said amplitude regulator; urging means for biasing said single manually operable member to the first position; said program means including holding means for holding said single member in the second position against the action of said urging means when said single member has been moved directly from said first position to the third position, through the second position, and subsequently has been released from the third position, and actuating means for returning said single member directly to the first position when said single member has been moved from a position of having been held in the second position to the third position and subsequently has been released from the third position, means for operatively connecting said single manually operable member with said amplitude regulator for changing the condition of said amplitude regulator from said optionally set condition to a condition for non-oscillation of said needle bar independently of and without interference with said manual knob upon the shifting of said single manually operable member into the third position, whereby zigzag stitching with the amplitude optionally set by the manual knob, straight stitching, and the stop of the sewing operation are performed according to the shifting of said single manually operable member among the three positions under the operation of said program means.

Claim 23

A sewing machine, comprising: a frame; a needle bar carried by said frame for lateral oscillation and for endwise reciprocation; a main shaft rotatably mounted on said frame for actuating said needle bar; an electric motor for driving said main shaft; a motor driving circuit for supplying electrical power to said electric motor; an amplitude regulator for regulating the amplitude of lateral oscillation imparted to said needle bar; a first knob operatively connected with said amplitude regulator for optionally setting said amplitude regulator in a desired condition; a single manually operable member, shiftably mounted on said frame and operatively connected with said motor driving circuit, for actuating said motor driving circuit to control running and stopping of the machine; program means operatively associated wih said single manually operable member and effective for positioning the single manually operable member selectively in each one of three different positions and for shifting the single manually operable member among the three positions in a programmed sequence, the first position providing the stopping of the machine the second position providing the running of the machine under the optionally set condition of said amplitude regulator, and the third position providing the running of the machine under another condition of said amplitude regulator; urging means for biasing said single manually operable member to the first position; said program means including holding means for holding said single member in the second position against the action of said urging means when said single member has been moved directly from said first position to the third position, through the second position, and subsequently has been released from the third position, and actuating means for returning said single member directly to the first position when said single member has been moved from a position of having been held in the second position to the third position and subsequently has been released from the third position, means for operatively connecting said single manually operable member with said amplitude regulator for changing the condition of said amplitude regulator from said optionally set condition to a condition for non-oscillation of said needle bar independently of and without interference with said manual knob upon the shifting of said single manually operable member into the third position, whereby zigzag stitching with the amplitude optionally set by the manual knob, straight stitching, and the stop of the sewing operation are performed according to the shifting of said single manually operable member among the three positions under the operation of said program means.