Stop control motor for a sewing machine

Claim 2

In combination, a sewing machine having a sewing needle and motor means for driving said sewing needle through vertically reciprocating sewing strokes, said motor means having stopping characteristics related to its operating speeds, and a stop control for said sewing machine comprising a first motor control means for operating said sewing needle drive motor means at varying speeds so as to contribute to effective use thereof during a normal sewing interval of operation, a second motor control means operatively effective to operate said sewing needle drive motor means at a known selected speed having a correspondingly known stopping characteristic, a first sensing means operatively effective preparatory to termination of the sewing operation of said sewing machine to automatically cause the operation thereof by said second motor control means in preference to said first motor control means so as to have said sewing needle drive motor means operating at said known selected speed of operation, and a second sensing means operatively effective to terminate the sewing interval of said sewing machine while it is operating at said known selected speed, whereby said termination of operation occurs in accordance with said known stopping characteristic to contribute to termination in feed movement of the fabric being sewn at a selected location defining a work station.

Claim 3

The sewing machine stop control as defined in claim 1 wherein said motor means comprises two separate motors and a clutch means for selectively completing a drive between only one of said two motors and said sewing machine.

Claim 4

The sewing machine stop control as defined in claim 2 wherein said first and second sensing means are photocells disposed along the path travelled by the fabric being fed to said sewing needle.

Claim 5

A stop control for a sewing machine having a vertically reciprocating sewing needle and a high speed motor operatively arranged to provide rapid sewing service of said sewing needle during the normal sewing interval of operation of said sewing machine, said stop control comprising means defining a feed path past said sewing needle for edge-finishing material in strip form being stitched to a body fabric by said sewing needle, a work station established at a strategic location along said feed path immediately beyond said sewing needle, a cutting device disposed at said work station operatively effective to sever said strip at a selected cut-off location therealong at the termination of said sewing interval, a low speed motor operatively arranged to power said sewing needle in sewing operation in substitution for said high speed motor, a first encountered sensing means located along said feed path in advance of said sewing needle by a selected amount sufficient to cause the powering of said sewing needle by said low speed motor instead of by said high speed motor before said strip cut-off location moves into said work station, and a second encountered sensing means located between said first encountered sensing means and said work station operatively connected to terminate feed movement of said edge-finishing strip with said cut-off location thereof in cutting relation to said cutting device at said work station and to cause cutting operation of said cutting device, whereby the terminal portion of the feed movement of said edge-finishing strip is advantageously automatically at a low speed to facilitate the stopping and cutting of said strip.

Claim 6

A stop control for a sewing machine having a vertically reciprocating sewing needle and a high speed motor operatively arranged to provide rapid sewing service of said sewing needle during the normal sewing interval of operation of said sewing machine, said stop control comprising means defining a feed path past said sewing needle for edge-finishing material in strip form being stitched to a body fabric by said sewing needle, a work station established at a strategic location along said feed path immediately beyond said sewing needle, a cutting device disposed at said work station operatively effective to sever said strip at a selected cut-off location therealong at the termination of said sewing interval, a low speed motor operatively arranged to power said sewing needle in sewing operation in substitution for said high speed motor, a first encountered sensing means located along said feed path in advance of said sewing needle by a selected amount sufficient to cause the powering of said sewing needle by said low speed motor instead of by said high speed motor before said strip cut-off location moves into said work station, and a second encountered sensing means located between said first encountered sensing means and said work station operatively connected to terminate feed movement of said edge-finishing strip with said cut-off location thereof in cutting relation to said cutting device at said work station and to cause cutting operation of said cutting device, whereby the terminal portion of the feed movement of said edge-finishing strip is advantageously automatically at a low speed to facilitate the stopping and cutting of said strip.

Claim 7

The sewing machine stop control as defined in claim 4 including a cLutch means operated by said first encountered sensing means for disconnecting the drive connection to said sewing machine of said high speed motor and completing the drive connection for said low speed motor.

Claim 8

The sewing machine stop control as defined in claim 5 wherein said first and second sensing means are photocells.