US1216537A

US1216537A - Thread cutter and clamp for sewing-machines.

Info

Publication number: US1216537A
Application number: US7108016A
Authority: US
Inventors: Frank Zaleski
Original assignee: Reece Button Hole Machine Co
Current assignee: Reece Button Hole Machine Co
Priority date: 1916-01-08
Filing date: 1916-01-08
Publication date: 1917-02-20
Anticipated expiration: 1934-02-20

Description

F. ZALESKI. THREAD CUTTER AND CLAMP FOR SEWING MACHINES. 4

APPLICAT'WH mi() 1AN.8,19I6

l l @37, mme@ Feb. 2o, 1917,

particular machine herein illustrated', this relative movement is secured by giving movement to the work-clamping means by means of a feed cam shown in dotted lines at 10.` When the machine is brought to rest at the end of each cycle of operations the parts are in -buttonhole-cutting position, as shown in Fig. 1, and the i york clamps 5 are raised. lVhen the machine is started, the

work clamps are first depressed to clamp the work lw against the clamp plates, and then the cutter 9 operates to cut the buttonhole. Thereafter the feed cam l() moves the workclamping means relative to the stitch-ferne ing mechanism to carry the work from buttonhole-cutting to stitching position and the stitching begins, the work-holding means having a continued feeding movement to effect the formation of the stitches around the edge of the buttonhole. XVhen the stitch.- ing has been completed around the buttonhole, the stitch-forming mechanism is brought to rest, and the work-holding means and stitch-forming mechanism have a further relative movement to carry the parts from stitching to buttonhole-cutting position.

The Ithread clamp which is illustrated in my above-mentioned co-pending application 1s carried by the movable work clamps and is actuated to clamp the needle thread t at the end of the stitching operation and while the parts are moving from stitching to buttonhole-cutting position. This threadclamping device comprises a fixed clamping jaw 13 and a movable clamping jaw r141. `The fixed jaw 13 is carried by an arm 15 which is made rigidwith one of the arms 6 by Ameans of a screw 16. The movable jaw 14 is carried by a lever 17 which is pivoted on a stud 18 secured to the arm 15. This arm 17 has a pin 20 rising therefrom which is acted upon by a suitable spring 19, said spring tending to hold the

clamping jaws

13 and 14 closed. The-lever 17 is provided with a cam projection 21 adapted to engage a roll 22 on the end of alever 23 which is pivoted at 24 to a base plate or support 29 that in turn is secured to the frame 1. This lever 23 has a finger 25 extending therefrom which plays between two

adjustable stop screws

26, 27. During the lstitching on the buttonhole, the work-clamping means isso position that the roll 22 will be at thc right on the cam projection 2l and the

stop screws

26, 27 are so adjusted that when the parts move from the stitching to buttonhole-cutoperation, the cam projection 21 will strike the roll 22, as shown in Fig. 2, thereby opening the clamping jaws andV permitting the needle thread to pass between said jaws as the work clamp is moved backwardly. Before the parts reach buttonhole-cutting position the roll 22 has passed the cam pro. jection 21, thus allowing the clamping jaws to close under the infiuence of the spring 19 and clamping the needle thread, as shown in Fig. 1. iVhen the machine is started again and the work-clamping device is moving` from buttonhole-cutting to stitching position, the cam 21 will engage the roll 22 and swing the lever 23 so as to carry' the linger 25 against the stop 26. Said stop is so adjusted that the finger will be brought into engagement (herewith justfas the iirst stitches on the buttouhole are being formed and as the work clamp continues its movc` just as the initial stitches are being formed.v

The thread-clamping device` as above dcscribed is such as is illustrated and described in my said co-pending application. 4

By my present invention I have provided a thread-cutting device which is independent from the thread-clamping means and which is actuated by the lever 23 to cut the needle thread after it has been clamped. My improved thread-cutter is shown as a cutting blade 30 which is carried on an arm or lever 31 that is pivoted to the work clamps. One convenient wayof accomplishmg this is to pivotally mount the arm 3l en the same stud 18 on which the lever 17 upon by a spring 32 which normally holds the cutting blade in its retracted position, and said arm 31 has also mounted thereon a roll 33 situated to be engaged by the roll 22 during the movement of the work-holding means from stitching to buttonhole-'cutting position and immediately after the roll has acted on the projection 21. In the opis pivoted. This arm 31 is shown as actedI eration of the device when the stitching on ing mechanism is brought torest with the needle raised as usual, and the work-clamping means then moves toward lthe right, Fig. 2. During this movement the projection 21 engages the roll 22 and opens the thread-clamping jaws as shown in F ig.'2, and as the projection wipes by the roll, the jaws will close onto the thread which has been drawn between them'by the movement of the work clamps, thereby clamping the thread. .Immediately after the thread is clamped the continued movement of the work-clamping means brings thc roll 33 against the roll 22 thereby giving a quick forward movement to the arm 31 and causing the cutting edge 35 of the cutting blade 30 to be carried against the thread extending between the thread clamp and the work. This portion of. the thread will be held taut so thatthe movement of the cutting blade against it will sever it accurately and with certainty regardless of the size orl character thereof. It will thus be seen`that the threadcutting device is separate from the. thread clamp and is operated subsequently to the clamping of the thread. It will also be seen that said thread-cutting' device is actuated by the same means that controls the movement of the thread clamp, this means acting rst to eli'ect the clamping of the thread and then the cutting thereof.

I claim:

l. ln a sewing machine, the combination with stitch-forming mechanism, ot' workclamping means, said stiteh-torn'lingmechanism and workclamping mains havinga movement relative to each other during a predetermined cycle of operations including a stitching operation, a thread clamp carried by said work-clampingmeans above the work, a cutter separate from-the thread clamp, and means rendered 'operative' by such relative movement to cause the thread clamp to clamp the thread at the end of the stitching operation and then to actuate the cutter to cut` the thread.

2. In a sewing machine', the combination with stitch-forming mechanism, of workclamping means, said'stitch-forming `mechanism and work-clamping means having a relative movement during aprede terrinined cycle of operations includ/inga stitching operation, a pair of thre:-1d-clamp1ng jajws car-l ried by the work-clamping means abfffve the work, a thread cutter separate from said jaws, and means rendered operative by such 'relative movement to cause the jthreadclamping jaws to clamp the thread at the.

vend of the stitching operation and subsequently to actuate the cutter tol cut the clamped thread.

3. In a sewingl machine, the combination with stitch-forming mechanism, "of Workclamping means, said stitch-formifiigmechanism and work-clamping meanslhaving a movement relative to veach other during a predetermined cycle of operations including a stitching operation, two movabl elements,

one adapted to clamp and the .o her to cut `the needle thread above the work ,lheld' 1n the work-clamping means and means to actuate said elements successively at the end of the stitching operation whereby the hread Will y be first clamped and then cut.

4. In a buttonhole sewing m ichinc, the combination with stitch-forminglmechanism including a reciprocating eye-'poihted needle, ot work-clamping means, means jto give the work-clamping means a work-feeding movement while the edge stitches on abuttonhole are being formed and an additional movement after the stitching on a buttonhole isthe thread `at the end of the stitching operation and subsequently to actuate the cutter to cut the thread.

,"5..In a buttonhole sewing machine, the combination with a frame carrying stitchforming mechanism, of work-clamping jneans, means to move the work-clamping neans on the frame thereby to move the ,n vork carried thereby from stitching to butfton hole-cutting position, a fixed and a mov- "i: ble thread-clamping jaw mounted on the work-clamping means above thc work held in the work-clamping means, a thread cutter independent'from said jaws. and also mounted on -said work-clamping means, and an actuator carried by said-frame and operating duringsaid movement of the workclamping means to cause the thread-clamping to clamp the thread and subsequentlyV to actuate the cutter to cut the clamped thread.

combination with a frame carrying stitchforming mechanism, of work-holding,r means, means to move the work-holding means 0n the frame thereby to more the work from stitching to biittonhole-cutting position, a fixed and a movable thread-clamping jaw mounted on the work-holding means, a cam projection rigid with the movable jaw, a swinging cutting blade separate from said thread-clamping jaws, and an actuator-carried by said trame and adapted to engage said cam projection-and actuate the movable thread-clamping jaw and subsequently/to actuate the thread cutter.

- 7. In a buttonhole sewing machine, the combination with a frame carrying stitchforming mechanism, otl Work-clamping means, means to give the work-clamping means a movement relative to the frame to carry the work from .st-itching tor buttonholc-cutting position, an arm `pivoteel to the Work-clamping means and carrying a threml-clamping jaw, said arm having a cam projection, a second arm pivoted to said work-clamping means and carryinga cutvting blade, said arm also having a projection, and an actuator carried by said ltrame and adapted 'to engage said projections successively during the movement of the work-clamjng means thereby to clamp -and cul. the thread successively'.

8. ln a buttonhole .sewing machine, .the combination with a frame carrying stitchsequently to actuate forming mechanism, of means,- means to move the Work-clamping means on the frame thereby to move the work carried thereby from stitching to buttonhole-cutting position, a fixed and a movable thread-clamping jaw mounted on the work-clamping means, a threadcutter independent from said jaws also mounted on said work-clamping means, and an actuator carried by the frame and a limited free movement in the direction of movement of the work-clamping means and operating during said movement of the work-clampintg` means to cause the threadclamping jaws to clamp the thread and subsequently to actnate the cutter to cut the clamped thread.

9. In a buttonhole sewing machine, the combination with stitch-forming mechanism, of work-clamping means said stitch-forming mechanism and forl-clamping means having a movement relative to each other duringa predetermined cycle of operations inelutling, a stitching operation, a thread clamp carried by said work-clamping` means above the work, a cutter separate from the thread clamp, and means rendered operative 'by such relative movement to cause the threadclamp to clamp the thread at the end of the. stitching operation and then to actuate the cutter to cut the thread and subsaid thread clamp to unclamp the thread.

l0. In a buttonhole sewingmachine, the combination with stitch-forming mechanism, of work-clamping' means, said stitch-form- .ing mechanism and work-clamping means having a movement relative to `each other during a predetermined cycle of operations includinga stitching operation, a thread clamp carried by said work-clamping means above the work, .a cutter separate from the work clamping capable of having predetermined cycle of operations including a stitching operation, a thread clamp carried by said Work-clamping means above the work, a cutter separate from the thread clamp, and means rendered operative by such relative movement to cause the thread clamp to clamp the thread at the end of the stitching operation and then to actuate thecutter t0 cut the thread and to cause said thread clamp to release the thread at the beginning of the next succeeding stitching operation.

l2. In a sewing machine, the combination with stitch-forming,- mechanism and workclamping,` means, said stitch-forming mechanism and work-clamping:r means having a movement relative to each other during a predetermined cycle of operations including a stitching operation, two movable elements, one adapted to clamp and the other to cut the needle thread above the Work held in the work-clampingmeans and means to actuate said elements successively at the end of the stitching operation whereby the thread will be first clamped and then cut and to actuate the thread-clamping element at thebeginning of the next succeeding operation thereby to release said thread.

In testimony whereof, I have signed my name to this specication.

' FRANK ZALESKI.