Thread wiper for sewing machines including a thread-separating arrangement

Claim 2

A thread wiper for the needle thread of a sewing machine of the type including a thread-severing device and thread tensioning and releasing means, said thread wiper comprising engaging means (32) for engaging said needle thread, actuating means (16) for causing said thread tensioning and releasing means to release the tension in said needle thread as said thread-severing device severs said thread, and connection means (28) connecting said engaging means (32) to said actuating means (16) for moving said engaging means (32) from an initial position into needle threadcatching position simultaneously with the release of said tension and for returning said engaging means to said initial position upon restoration of said tension.

Claim 3

A thread wiper as defined in claim 1 wherein said actuating means comprises a rotary solenoid having a linear stroke motion and a rotational motion, and means for transmitting said linear stroke motion to said thread-tensioning and releasing means and for transmitting said rotational motion to said engaging means of said thread wiper.

Claim 4

A thread wiper as defined in claim 1 wherein said actuating means comprises a rotary solenoid including an armature and a pin projecting therefrom, said connection means (28) comprising a Bowden wire having said engaging means at one end thereof in the form of a hook, and a lever (31) secured to said pin and connected to said Bowden wire remote from said hook.

Claim 5

A thread wiper as defined in claim 2 wherein said rotary solenoid includes an armature and a pin projecting therefrom, said connection means comprising a Bowden wire having said engaging means at one end thereof in the form of a hook, and a lever (31) secured to said pin and connected to said Bowden wire remote from said hook.

Claim 6

In a sewing machine wherein there are included a needle-thread-tensioning means and a needle-thread-deflecting means, the combination of a rotary solenOid having a part to which both rotary and longitudinal movement is imparted upon energization of the solenoid, means for actuating member, means for actuating the thread deflector means and including an releasing the thread-tensioning means to release thread tension and including an actuator member, means for simultaneously transmitting motion to both said members from said part upon energization of the solenoid to release the tension and place the thread deflector in thread-trapping position, and means effective upon deenergization of the solenoid to impart reverse movement to said members to restore the tension and retract the thread deflector to its at rest position.

Claim 7

In a sewing machine wherein there are included a needle-thread-tensioning means and a needle-thread-deflecting means, the combination of a rotary solenOid having a part to which both rotary and longitudinal movement is imparted upon energization of the solenoid, means for actuating member, means for actuating the thread deflector means and including an releasing the thread-tensioning means to release thread tension and including an actuator member, means for simultaneously transmitting motion to both said members from said part upon energization of the solenoid to release the tension and place the thread deflector in thread-trapping position, and means effective upon deenergization of the solenoid to impart reverse movement to said members to restore the tension and retract the thread deflector to its at rest position.

Claim 8

In a sewing machine wherein there are included a needle thread tension means and a needle-thread-deflecting means, the combination of a rotary solenoid having a part to which both rotary and longitudinal movement is imparted upon energization of the solenoid, means for actuating the thread deflecting means and including a first actuating member, means for releasing the thread-tensioning means to release thread tension and including a second actuator member, and means for transmitting rotary movement from said part to said first member and means for transmitting longitudinal movement from said part to said second member upon energization of the solenoid to place the thread deflector in thread-trapping position and to release the thread tension respectively, and means effective upon deenergization of the solenoid to impart reverse movement to said members to restore the tension and retract the thread deflector to its at rest position.

Claim 9

In a sewing machine wherein there are included a needle thread tension means and a needle-thread-deflecting means, the combination of a rotary solenoid having a part to which both rotary and longitudinal movement is imparted upon energization of the solenoid, means for actuating the thread deflecting means and including a first actuating member, means for releasing the thread-tensioning means to release thread tension and including a second actuator member, and means for transmitting rotary movement from said part to said first member and means for transmitting longitudinal movement from said part to said second member upon energization of the solenoid to place the thread deflector in thread-trapping position and to release the thread tension respectively, and means effective upon deenergization of the solenoid to impart reverse movement to said members to restore the tension and retract the thread deflector to its at rest position.

Claim 10

In a sewing machine wherein there are included a needle-thread-tensioning means and a needle thread deflecting means, the combination of a rotary solenoid having a bolt to which both rotary and longitudinal movement are imparted in one direction upon energization of the solenoid and in reverse direction upon deenergization, means for actuating the thread-deflecting means and including a first actuating member, means for releasing the thread-tensioning means to release thread tension and including a second actuating member, said first actuating member being effective to transmit the rotary motion of the bolt to the thread-deflecting means to first project the thread deflector to a thread-tapping position upon energization of the solenoid and then upon deenergization of the solenoid to retract the thread deflector to its at rest position, and said second actuating member being effective through engagement with and longitudinal movement of the bolt on energization and subsequent deenergization of the solenoid to first release the thread-tensioning means and then restore the thread-tensioning means during the thread-deflecting action of the thread deflector.

Claim 11

In a sewing machine wherein there are included a needle-thread-tensioning means and a needle thread deflecting means, the combination of a rotary solenoid having a bolt to which both rotary and longitudinal movement are imparted in one direction upon energization of the solenoid and in reverse direction upon deenergization, means for actuating the thread-deflecting means and including a first actuating member, means for releasing the thread-tensioning means to release thread tension and including a second actuating member, said first actuating member being effective to transmit the rotary motion of the bolt to the thread-deflecting means to first project the thread deflector to a thread-tapping position upon energization of the solenoid and then upon deenergization of the solenoid to retract the thread deflector to its at rest position, and said second actuating member being effective through engagement with and longitudinal movement of the bolt on energization and subsequent deenergization of the solenoid to first release the thread-tensioning means and then restore the thread-tensioning means during the thread-deflecting action of the thread deflector.

Claim 12

In a sewing machine wherein there are included a sewing head with reciprocable needle bar, presser foot and needle-thread-tensioning means, the combination of a solenoid, a needle thread deflector including a hook ended Bowden wire means supported by the head in position for having the hooked end of the wire of the Bowden wire means projectable and retractable across the general path of needle movement, and means operable upon energization and deenergization of the solenoid to project the free hooked end of the wire across the needle path into position for trapping a needle thread portion extending between the needle eye and the presser foot and then retract the same to deflect said thread portion and prevent clamping thereof under the presser foot.

Claim 13

In a sewing machine wherein there are included a sewing head with reciprocable needle bar, presser foot and needle-thread-tensioning means, the combination of a solenoid, a needle thread deflector including a hook ended Bowden wire means supported by the head in position for having the hooked end of the wire of the Bowden wire means projectable and retractable across the general path of needle movement, and means operable upon energization and deenergization of the solenoid to project the free hooked end of the wire across the needle path into position for trapping a needle thread portion extending between the needle eye and the presser foot and then retract the same to deflect said thread portion and prevent clamping thereof under the presser foot.

Claim 14

The machine structure defined in claim 8 wherein the means operable upon energization and deenergization of the solenoid includes a bolt to which forward and reverse rotary motion is imparted, and an actuator arm extending generally radially from the bolt and attached at its free end to the wire of the Bowden wire means.

Claim 15

The machine structure defined in claim 8 wherein there also are included means operable from the solenoid upon energization and deenergiZation thereof for releasing the thread tension means as the wire of the Bowden wire means is projected into thread-trapping position and for again restoring the thread tension as the wire is retracted to deflect the needle thread portion.

Claim 16

The machine structure defined in claim 9 wherein the bolt also has a reciprocation along its axis upon energization and deenergization of the solenoid, and thrust rod means are provided engaging between the bolt and the thread-tensioning means and effective to control the tensioning to release thread tension as the wire of the Bowden wire means is projected and restore said tension when the wire is retracted.

Claim 17

The machine structure defined in claim 9 wherein the bolt also has a reciprocation along its axis upon energization and deenergization of the solenoid, and thrust rod means are provided engaging between the bolt and the thread-tensioning means and effective to control the tensioning to release thread tension as the wire of the Bowden wire means is projected and restore said tension when the wire is retracted, said rod means comprising end abutting bipartite rods slidable in bearing means traversing the sewing head.

Claim 18

In a sewing machine whererin there are included a sewing head with a reciprocable needle bar and presser foot, the combination of a solenoid, a needle thread deflector including a Bowden wire means having a wire with a hook at a free end thereof, mounting means for locating said Bowden wire means in position for projecting and retracting said hook across the general path of needle movement, and means operable upon energization and deenergization of said solenoid for projecting said hook across the needle path for seizing a needle thread portion extending between the needle eye and the presser foot and then retract said wire to deflect said needle thread portion for preventing clamping thereof under said presser foot.

Claim 19

In a sewing machine whererin there are included a sewing head with a reciprocable needle bar and presser foot, the combination of a solenoid, a needle thread deflector including a Bowden wire means having a wire with a hook at a free end thereof, mounting means for locating said Bowden wire means in position for projecting and retracting said hook across the general path of needle movement, and means operable upon energization and deenergization of said solenoid for projecting said hook across the needle path for seizing a needle thread portion extending between the needle eye and the presser foot and then retract said wire to deflect said needle thread portion for preventing clamping thereof under said presser foot.

Claim 20

Apparatus as defined in claim 13 wherein mounting means are provided for mounting said solenoid on said sewing head.

Claim 21

Apparatus as defined in claim 13 wherein a lever (31) is connected to said solenoid, and means for connecting said wire to said lever.