US1154774A - Chain-stitch shoe-sewing machine. - Google Patents

Description

A. E. JERRAM.

CHAIN STITCH SHOE SEWING MACHINE. APPLICATION FILED SEPTUZ, 1910.

Patented Sept. 28, 1915 2 SHEETSSHEET I.

A. E. JERRAM. CHAIN STITCH SHOE SEWING MACHINE.

APPLICATION FILED SEPT.2,I910.

' Patented Sept. 28

1915. 2 HEETSSHEET 2. a).

required for the stitch trap sears ARTHUR ERNEST JERRAM. 0F LEICESTER, ENGLAND, ASSIGNOR T0 UNITED SHOE MACHINERY COMPANY,'OF PATEBSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.-

CHAIN-STITCH SHGE-SEWING' MACHINE.

Patented @ept. 22%, 1915.

Application filer) september 2, 1910. Serial No. 580,171.

To all whom. it may concern Be it known that I, ARTHUR E. Jnanair, a subject of the King of Great Britain. re siding at Leicester, in the county of Leicester, ,England, have invented certain new and useful Improvements in Chain-Stitch Shoe-Sewing Machines; and 1 do hereby declare'the following'to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to stitch setting and thread controlling devices particularly applicable to chain stitch sewing machines having hooked needles.

The object of this invention is to insure a better and a more positive control of the thread whereby only the amount of thread shall be pulled from the supply, and whereby the stitch shall be tightened more effectually than heretofore.

Accordingly, the invention comprises the provision for a chain stitch shoe sewing ma chine having a hooked needle and thread controlling devices comprising a take-up and a thread locking device, with a yielding auxiliary take-up or thread check between them, of locking means independent of the action of the thread for definitely determining the position of the yielding auxiliary take-up when thread for 'a. stitch is measured from the supply, in order that the yielding resistance shall not be able to steal or cause an undue quantity of thread to be measured off from'the supply as it would be had this resistance to be overcome as heretofore by the pull of the thread itself during the thread measuring stroke of the take-up.

Another feature of the invention contemplates a construction of the controlling devices which comprise an abutment, that to stitch to be set against a predetermined resistance, is made yielding, and in conjunction with this there may be a locking device operatingat certain periods in the cycle of operations to cause it to act as a stationary abutment, and there may be further or adjustable means to limit the extent of yield.

A further feature comprises the employ ment in the operative mechanism for the take-up of means, for examp1e,.a cam with 21 dwell in it, which will interrupt the thread pulling motion of thetake-up at the moment at which the lock is put on the sup- 1y to' enable a stitch settin pull to be exerted on the thread.

With these objects in view, my invention cons sts in the stitch setting and thread controlling devices.hereinafter described, as defined in the claims.

in the drawings accompanying-this ap plication I have illustrated a preferred form of my invention as applied to the wellknown Goodyear welt and turn machine which is illustrated and described in the patent to French and Meyer, No. 412,704,

October 8, 1889. It is to be understood, however, that my invention is clearly applicable to other types ofsewing machines, and that it can be otherwise embodied without departingfrom the spirit of my invention.

In the drawings, Figure l is a side elevation partly in section of the head of the ma chine; Fig. 2 is a par tial front elevation of the head shown in Fig. 1; Fig. 3 is a side elevation of the take-ups and their mechanisms with the spring plunger locked; and

Fig. is a view of the parts shown in Fig. 3,

but with the spring plunger free.

Referring to the drawings, 1 indicates the standard of the machine, Qthe driving shaft which bears the cam wheels for operating the sewing mechanism, and which rotates in the direction indicated by the arrow in Fig. 1, the cam wheel 3 with its cam slot t for actuating the thread finger cam lever 5 being shownin full lines, and indicated in dotted lines is the cam slot 6 (provided with a dwell 7) and in which is engaged the cam roller 8 carried upon and operating the bell crank lever 9 which through the link 10 operates the main take-up which comprises a thread roll or truck 11 mounted on the end of an arm 12 which is fulcrumed by a sleeve 13. At 14 is indicated the cam operated lever controlling the feed point or awl, which is not shown. Theneedle i5 is shown. in Fig. 1 as operating shoe 16, the needle being in retracted position having pulled the loop of thread through the work, the thread being indicated by a dot-dash line.

T he parts above described are constructed and arranged to operate in a well-known manner substantially as set forth in the above mentioned patent to French and Meyer, and further description thereof is I and auxiliary take-up is a large roll 22jourconsidered unnecessary.

The auxiliary take-up or thread check comprises a truck or roll 17 mounted on the end of the short arm 18 which is attached to a rockshaft 19 which passes through the sleeve 13 which supports the main take-up.

The rock shaft is extended through the sleeve, andcarries rigidly fixed to its end a lever arm 20 adapted to cotiperate with various stops in order to limit and control the amotiint of the movement of the auxiliary take-up. The auxiliary take-up is impelled in a downward direction bymeans of a spring 21 acting on the arm 20.

Goiiperating with the rolls of the take-up naled to the frame of the machine and around which the thread passes so that a shoe piece 23, which is adaptedto cotiperate with the large roll, may look or clamp the thread thereon. The shoe piece is mounted on one end of an elbow-lever 24, the other end of said elbow-lever being connected through a toggle 25 and 26 to some moving part'of the mechanism, preferably, as shown,

' the cam operated lever 14 which controls the chine frame.

feeding point or awl, and the cam path which controls the movement of the lever 14: may be given the necessary variation from that shown in the French and Meyer patent to cause the shoe 23 to fall and rise to clamp and unclamp the thru d at the correct time in the cycle of operations, and still not interfere (With the engagement of the feeding point with the work. In order that the grip of the shoe piece on the thread may be adjusted, an eccentric adjustment is provided .at the joint 27 of the toggle. Connected to the elbow lever 24 is an arm 28 having a pin 29 which acts on the cam face 30 of the pivoted detent 31, which is adapted to engage and look a spring pressed plunger 32 which at times forms an abutment for thearni 20 which is rigidly connected with the auxiliary take-up roll 17 The detent is normally rocked about its pivot into locking engagement with the plunger 32 by means of a spring 33, but-when the elbow lever 2. is-

rocked about its pivot to depress the shoe piece 23, the pin 29'rides down the cam face 30 and forces the lower end of the detent outwardand so releases the plunger 32.

I The lever arm 20 is adapted to engage with. its upper face the plunger 32 and with which screws into the end of the enlarged recess: This thumb screw is held in its adjusted position by means of the small locking screw 38. At the lower end of the reduced portion of the rod there is a collar 39 which is adapted to limit the downward. movement of the plunger under the action of the spring 36.

Opposite the reduced portion 35 of the plunger there is a projection 40 on the machine frame into which is. threaded a screw 41 held in adjustable position by .means of the jam nut 42. This screw is adapted to project more or less into the space left at the reduced part upon the plunger, and forms an abutment against which the collar 39 may strike to limit the upward movement of the plunger 32 under the action of the lever arm 20 so that said upward movement is checked positively. I

Then the stitch is being set by the take-up 11, the threadpulling on the roll 17 acts through the arm 20 and the plunger 32 to compress the spring 36, whereby the stitch is set with a yielding pull; When the upward movement of the plunger 32 is checked by the screw -l1, the roll 17 can no longer yield so thatthe stitch may be finally set with a positive pull. yielding movement of the plunger 32 and hence the amount that the thread may be positively pulled in the final setting of the stitch can be varied by adjusting the screw 41. To prevent the spring plun- 'ger 32 being displaced by the yielding of its spring during the thread measuring The amount of the stroke of the tak'e-up, the detent 31, already described is provided, and this detent operates in conjunction with the shoe piece 23 so that as soon a: the thread is locked the plunger 32 is released by the retraction of machine, passes around the large locking roll 22, under the thread truck or roll 17 of the. auxiliary take-up, over the thread truck or roll 11 of the main take-up, and thence to the looper and-the WOIlL;

It has been found that when, as heretofore, the upward motion of the take-up is continuous and the machine is running at a high speed, it is extremely difficult, owing to the inertia of the parts and'especially after I they have becomesomewhat worn, to apply the shoe piece23 to the large roll 22'at the J precise moment necessary in orderto insure ate this the cycle of operations and so provides that the correct amount of thread'be drawn from the supply.

The operation of the device is as follows: \Vhile the needle is being looped by the thread and while it is pulling the thread through the material,-the main take-up acts manner and the auxiliary takeunder the tension of the light coiiperates 1n the usual manner in its usual up acting spring 21 with the main take-up to control the thread.

After the needle has been thrust through the work and the loop drawn about the shank of the needle, the rising of the take-up pulls thread from the supply 45 'in preparation for the next succeeding stitch. In order that there may be always an exactamount of thread measured from the supply, and that there may be no yielding means acting on the thread which would tend to steal 7 more thread, I have provided that the thread shall be given a positive pull during the time that it is pulled from the thread supply. As the main take-up 11 rises to pull the threadfrom the supply if), the abutment 44 rides over and depresses the stop l3, thus raising the arm 20 against the plunger 32 and positively locking the auxiliary takeup in the position shown in Fig. 3. The'fiat face of the abutment ll acts as a lock on i the stop 43 as the link 10 is-given further supply l5, and

all of the spring pressed parts of the thread movement, and the plunger 32 is locked against upward movement by the detent 31 engaging the collar 39. 'During this part of the stitch forming operation the shoe 23 is out of engagement with the roll '22 so.

may be drawn from the that the thread it will be seen that since controlling mechanism are positively locked there is nothing to steal thread, and that an exact amount will always be drawn from the thread supply. At the completion of this movement of the takeup 11 which has measured the thread from the supply for the next stitch, the roller 8 enters the dwell 7 in the cam slot (3. l' v hile the roller 8 is still in the dwell 7 the continued turning of the shaft 2 actuates the lever 14% sufficiently to clamp the shoe piece against and at the same time to cause the pin QSl-to ride over the cam face 30 releasing the detentfil from the partfit}; I After the thread thethread rollQQ-loeking the thread locked by the plunger but rises, lifting the plunger 32 and compressing the spring 36, the continued compression of the spring 0 36 giving an increasing tension to the thread as the stitch is'set in the work, and thus imitating the manner of the setting of a stitch by the hand of a skilled workman. The screw 41 may be adjusted .to engage the collar- 39, so that, if desired, at the end of the stitch setting stroke the stitch may be set under a positive pull. It can be readily seen that by momentarily interrupting the thread pulling motion of the take-up 11 while the thread is being locked, anexact adjustment of the amount ofthreadmeasured from the thread supply may be had. After the stitch has been set, the take-up 11 falls,

- and the elbow lever 28 is retracted, releasing spring 21 during the retraction of the needle and during the first steps of the stitch forming operation after the needle has entered the next awl hole. It will be noted that the auxiliary take-up has a triple function. During the retraction of the needle and the preliminary loop forming operation it performs the usual function of the auxiliary features of my in'iprovement may be used singly, the other parts of the combination being omitted. For instance, the device which raises the auxiliary take-up against the pressure of its spring 21 could be dis pensed with and the auxiliary take-up raised by the tension of the thread alone against the plunger 32, which would thenact to set take-up as set forth in the French andthe stitch against. the increasing pressure of the spring 31, or again it would be possible to omit the dwell in the cam and rely on the accuracy of the parts for drawing the correct amount of thread from the supply, or other parts may be used singly as necessity or convenience may. dictate.

I .am aware of the patent to Briggs, No. 687,719, dated December 3, 1901, which discloses a spring pressed device against which .the stitch is set and which is locked while thread is being pulled from the supply. This spring pressed device of the 'Briggs patent,-however, is not the equivalent of the auxiliary take-up referred to in" the following claims which is the ordinary auxiliary take-up which takes care of the slack thread givenup by the take-up and which in a machine of 'the Briggs type exerts a slight tension on the thread during the op-- eration of the looper and thread'finger.

Having explained the nature and object of the invention, and specifically described one form of mechanism in which it may be embodled, what I claim 1s:

1. A chain stitch shoe sewing machine,

having, in combination, stitch forming mechanism, a thread supply, a take-up, an auxiliary take-up cooperating with the takeup to control the thread given up by the takea p' and exerting a light strain on the thread as comparedwith the strain exerted in setting a stitch, and means for preventing the auxiliary take-up from acting during the time thethread is being pulled "'from the thread supply.

2. A chain stitch shoe sewing machine, having, in combination, stitch forming mechanism, a thread supply, a positively actuated take-up, a yielding auxiliary take- .having, in combination, stitch forming mechanism, a thread supply, a take-up hav- .ing a positive action on the thread, a yielding .au-xiliary take-up cotiperating with the take-up to control the thread givenup by the take-up and exerting a light strain on the thread as compared with the. strain exerted in'se tting a stitch, and means for locking the auxiliary take-up during the time the thread is being pulled from the thread supply, whereby the thread is relieved fromthe action of all yielding means .tending to steal thread.

4,." A chain stitch shoe sewing machine, having, in combination, stitch forming mechanism, a thread supply, a take-up having a positive action on the-thread, a springpressed auxiliary take-up, and means inde pendent of the action of the thread and operating in timed relation to the stitch forming mechanism for retracting the auxiliary take-up agalnst the tension of its spring during that part of the cycle of stitch forming operations when the thread is pulled from the thread supply.

.' 5. A chain stitch shoe sewing machine, having, .in combination, stitch forming mechanism, a thread supply, atake-up, a spring-pressed auxiliarytake-up, and means for retracting and locking the,auxiliary take-up against the tensi0n of its spring during apart of the stitch forming operation.

6. A chain stitch shoe sewing machine,

having, in combination, stitch formig mechanism, a thread supply, an intermittent thread locking device for lockingthe thread while the stitch is being set, a takeup, and means for arresting the thread taking movement of the take-up while the lockmg means is being actuated to lock the thread.

7. A chain stitch shoe sewing machine,

having, .in combination, stitch forming mechanism, a thread supply, a take-up having a thread pulling movement, a part of said movement serving to draw off thread from the thread supply for the next suc-' ceeding stitch and the succeeding part of said movement serving to set the stitch, an intermittent thread locking device for locking the thread during the stitch setting movement, and means for interrupting the thread pulling movement of the take-up while the thread locking means is being actuated to lock the thread, whereby the amount of thread to be drawn ofl from the thread supply may be accurately measured.

8. A chain stitch shoe sewing machine,

having, incombination, stitch forming mechanism, a thread supply, an intermittent thread locking-device for locking the thread while the stitch is being set, a take-up and a cam for actuating the take-up having a dwell to interrupt the thread pulling stroke of the take-up while the locking dey vice is actuated to lock the thread.

9. A chain stitch shoe sewing machine, having, in combination,. stitch, forming mechanism, a thread supply, a take-up, an auxiliary take-up, a movable stop limiting the movement of said auxiliary take-up, means for locking said stop while the thread is being pulled from the thread supply,

means for unlocking said lockingme'ans, and means for interrupting the thread taking movement of the take-up while the unlock ing means is being ctuated. .7 10. A chain stitpii shoe sewing-machine, having in comb' ation, stitch forming having, in combination, stitch forming auxiliary take-up,

mechanism, a thread supply, a take-up, an auxiliary take-up, means for locking said auxiliary take-up while the thread is being pulled from the thread supply, means for unlocking said locking means, and means for interrupting the thread taking movement of the take-up while the unlocking means is being actuated.

11. A chain stitch shoe sewing machine, having, in combination, stitch forming mechanism, a thread supply, an intermittent thread. locking device, a take-up, an auxiliary take-up, a movable abutment for limiting the movement of the auxiliary takeup, means for locking said abutment while the thread is being pulled from the thread supply, and means for unlocking said abutment when the intermittent thread locking means is actuated to lock the thread.

12. A chain stitch shoe sewing machine, having, in combination, stitch forming mechanism, a thread supply, a take-up, an

auxiliary take-up, a spring resist-ing the first movement oi thi auxiliary take-up, and an. abutment arresting further movement of the auxiliary take-up",'said abutment being yieldingly held against movement by a spring during a part of the stitch forming opera? tion and being locked during the remainder of the stitch. forming operation. 7

13. A chain stitch shoe sewing machine, having, in combination, stitch forming mechanism, a thread supply, a take-up, an auxiliary ta ke-up, means for locking the auxiliary take-up while the thread is being pulled from the thread supply, yielding means for resisting the movement of the auxiliary take-up while the stitch is being set, and an t justable stop to limit the extent of the yield of said yielding means.

14. A chain stitch shoev sewing machine,

mechanism, a thread supply, a take-up, an auxiliary take-up cooperating with the takeup to control the thread given up by the take-up and exerting a light strain on the thread as compared with the strain exerted in setting a stitcln'means for locking the auxiliary take-up while the thread is being pulled from the thread supply, yielding means for resisting the movement of the auxiliary-take-up while the stitch is being set, and-a stop to limit the extent of the yield of said yielding means. i

15. A chain stitch shoe sewing machine, having. in combination, stitch forming mechanism, a thread supply, a take-up, an an abutment limiting the movement of the auxiliary take-up, means for locking said abutment while the thread is being pulled from the thread supply, and yielding means resisting the movement of said abutment with an increasing pressure during the setting of the stitch, whereby the thread may be taken from the thread having,

vited by a stop, whereby I supply with a positive pull and the stitch may beset under an increasing tension.

16. A chain stitch shoe sewing machine, in combination, stitch forming mechanism, a thread'supply, a takeup, an auxiliary take-up, an abutment limiting the movement for locking said abutment while the thread is being pulled from the thread supply, and yielding means resisting the movement 0 said abutment with an increasing pressure during thmsetting of the stitch, the extent of yield of said yielding means being limthe final setting of the stitch may be made positive. 7

17. A chain stitch shoe sewingmachine, having, in combination, stitch forming mechanism. a thread supply, a take-up, an auxiliary takeup means for yieldingly holding the auxiliary take-up against the tension of the thread, means for locking said auxiliary take-up while the thread is being pulled from the thread supply comprising means for retracting said auxiliary take-up against its yielding means and a spring-held abutment, means for locking said abutment while the thread is being pulled from the thread supply, and means for releasing said abutment'locking means while the stitch is being set, whereby the auxiliary take-up may resist the pull of the thread with a gradually increasing tension during the setting of the stitch.

' 18. A chain stitch shoe sewing machine, havin x' in combination, stitch forming mechanism, a thread supply, an intermittent th ead locking device for locking the thread while the stitch is being set, a take-up, an auxiliary take-up. a spring-h ld movable abutment i'or arresting the movement o; the auxiliary take-up, means for locking said abutment while the thread is being pulled from the thread supply. and means for releasing the abutment while the stitch is being set whereby the stitch may be set against the tension of the spring-held abutment.

19. A chain stitch shoe sewing machine, havin in combination. stitchforming mechanism, a thread supply, an intermittentthrcad locking device for locking the thread while the stitch is being set, a take-up, an auxiliary take-up. a spring-held movable abutment for arresting theanovemcnt of the auxiliary take-up. means for locking said abutment while the thread is being pulled from the thread supply. means for releasing the abutment while the stitch is being set, whereby the stitch may be set against the tension of the spring-held abutment, and a stop for limiting the movement of the-abut ment. whereby the final setting of the stitch may be made positive.

20. A chain stitch shoe sewing machine, having, in combination, stitch forming mechof the auxiliary take-up, meansanism, a thread supply,-a take-up, an auxiliary take-up, a light spring normally holding said auxiliary take-up, yielding means by which the auxiliary take-up is engaged near the extremity of its movement, and means for locking said yielding means against movement during a part of the stitch form ing operation.

21. A chainstitch shoe sewing machine, having, in combination, -lstitch forming mechanism, a-thread supply, a take-up, an auxiliary take-up, a spring normally press ing against said auxiliary take-up, a second spring acting on said auxiliary take-up only while the stitch is being set, and means independent of the action of the thread and operating in timed relation to the stitch forming mechanism for holding the aux iliary take u'p retracted against the first spring during that part of the cycle of stitch forming operations when the thread is pulled from the thread supply,

22. A chain stitch shoe sewing machine, having, in .combination, stitch forming mechanism, a thread supply, an intermittent thread lockin device for locking the thread While the stitch'is being set, a take-up, an

auxiliary. take-up, a spring normally hold.

ing the auxiliary take-up against the tension of the thread, a spring-held movable abutment against which the auxiliary takeup is engaged near the extremity of its movement, means for holding the auxiliary take-up retracted against the action of the mechanism, a thread supply, a take'up, a .yieldmg auxiliary take-up cooperating with the take-up to control the thread given up by the take-up, and means for locking the auxiliary take-up during a part of the cycle of the stitch forming operations comprising an abutment stationary during said part of the cycle and a member for positively holding the auxiliary take-up against said abutment.

. 24. A chain stitch shoe sewing machine having, 111 combination, stitch forming mechanism, a thread supply, a take-up, an auxiliary take-up cooperating with the takeup to control the thread given up by the take-up and exerting a light strain on the thread as compared with. the strain exerted in setting a stitch, means for locking the auxiliary take-up when the thread is being pulled from the thread supply, and yielding means acting on the auxiliary take-up to oii'er a gradually increasing resistanceto the pull of the thread when the stitch is set in the work. i v

25. A chain stitch shoe sewing machine having, in combination, stitch forming mechanism, a thread supply, a main takeup, mechanism foroperating the main takeup, a yielding auxiliary take-up cooperating with the take-up to control the thread given' up by the take-up-and exerting a light strain on the thread as compared with the strain exerted in setting astitch, and mechanism operated from the main take-up mechanism for locking the auxiliary take-up during a part. of the cycle of the stitch forming operations.

26. A chain stitch shoe sewing machine having, in combination, stitch forming mechanism, a thread supply, a take-up, an auxiliary take-up cooperating with'the takeup to control the thread given up by the take-up and exerting a light strain on the thread as compared with the strain exerted in setting a stitchmnd means for locking the auxiliary take-up against movement in either direction during a part oiflthe cycle of the stitch forming operations.

ARTHUR ERNEST JERRAM. Witnesses E inaxou PYwnLn, Joi-rx Riemann LAW.

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