US2374804A - Control mechanism for sewing machines - Google Patents

Description

May 1, 1945. J. BRUSSELL CONTROL MECHANISM FOR SEWING MACHINES Filed July 24, 1940 2 Sheets-Sheet l May 1, 1945. J. BRUSSELL CONTROL MECHANISM FOR SEWING MACHINES F'il'ed July 24, 1940 2 Sheets-Shet 2 INVENTOR. J4me flew-$511 Patented May 1, 1945 CONTROL MECHANISM FOR SEIWING MACHINES Jacob Brussell, New York, N. Y. Application July 24, 19-40, Serial No. 347,116

15 Claims.

This invention is directed to sewing machines, more particularly to mechanism associated with various parts thereof whereby adequate and Valuable control of the functions of the machine may be obtained.

The present invention is directly related to the subject matter of my Patent No. 2,175,247, issued October 10, 1939, entitled Button sewing machine, and Patent No. 2,175,248, issued Octoberv 10, 1939, entitled Construction of button sewing machines.

It is among the objects of the present invention to provide a machine which is adapted to sewbuttons and to be used for other purposes in which the functions of the machine are exclearness;

Fig. 3 is an enlarged fragmentary view of a cally, some parts being shown in section, and other parts having been removed forthe purpose of clearly illustrating the invention;

Fig. 2 is a fragmentary end view of the sewing machine head, some parts being broken away for portion of the mechanism controlling the move ments of the needle and button clamp, shown in perspective, and some parts being broken away i for clearness; and

panded to an extent as to allow great flexibility in use.

It is also among the'objects of the present invention to provide a machine which is capable of adequate and rapid operation under widely varying conditions, including the use of the machine on buttons having two and four holes, with the use of various-patterns of stitches for attaching the same to garments and. thelike.

It is further among theobjects of the present invention to provide a construction of sewing machine which is simple, sturdy, easy to operate,

which is readily adjustable bythe operator of the machine, and which has a number of automatically operated parts.

The present invention as applied to a button sewing machine involves a structure wherein there is the ordinary reciprocating needle for forming stitches anda button clamp for holding the button to be sewed onto the garment. In

accordance withthe present invention, the needle may be caused to vibrate with each stitch transversely of its normal'vertical movement. Cooperating therewith is the button clamp which may be caused to remain stationary during the vibra tion of the needle, or which may in itself be caused to vibrate with each stitch. The invention further provides that the clamp may vibrate in a horizontal plane during the sewing operations. Cooperating therewith, the. needle may have only its no'rinalvertical movements without any lateral movements, or the needle may be caused to shift laterally one or more times during a cycle for sewing on a button.

In the accompanying drawings, constitutinga part hereof, and in which like reference characters indicate like parts,

Fig. 1 is a side elevational view of a sewing machine made in accordance Withthe present invention, some'parts being shown diagrammati- 'Fig. 4 is an enlarged detail viewof one of the elements supplementing the showing of Fig. 3.

The sewing machine comprises the usual bed I, standard 2, overhanging arm 3, and sewing head 4. A horizontalshaft 5, which is the main shaft, has a crank S at the forward end thereof connected with ayoke 7 secured to needle bar 8, having needle 9 therein. shaft '5 is a crank liloperating rod I I Which'may be utilized to rotate the hook and associated mechanism located below'the bed plate of the sewing machine and omitted from the drawings for clearness. i

A driving pulley I3 is mounted on shaft 5 and is contiguous with idling pulley I2. A belt shifter I4 is securedto sliding member I5 operated by pin l6 secured to stop member. I'L' Said stop member is normally operated by. the functioning of a latch l8 connected up by suitable linkages 19 to a controller cam 20 secured on auxiliary shaft 2!, as described in Patent No. 2,175,247. A worm and gear 22 and,22" associated with shafts 5 and 2|, respectively, serve to provide the necessary movement of cam 20. The operation of this mechanism is to cause the stop I! to engage a notch in collar ll secured to shaft -5 .at

the proper time in order to stop theoperation of the machine automatically, as described in Patent No. 2,175,247 issued October 10, 1939.

A collar 23 having pins 24 mounted for oscillation in head 4, surrounds the upper part of needle bar 8. Collar 25 at the lower end of said needle bar is provided'with a crank 26 operated by oscillating shaft 27. a The oscillating orshifting movements of the needle bar 8 are controlled by mechanism 28, more adequately illustrated in Fig. 3'. v

The button clamp has a base member 29 and a pivoted body 30 terminating in button holder 3!. An adjustable tension device 32' tends. to hold the button holder on the bed land an extension 33' on base 29 provides means for attaching the button holder to an operating mechanism. Gear 35 on shaft Scooperates with gear 36 carried on shaft 31, the axis of which isjin At the rear of main is rigidly secured to shaft 21.

' beneath extension I I operation of 42 and 43 constituting guiding means I for member, 40. In a fork at the lower end thereof is pivoted one end of connector bar 45, the

opposite end of which is pivoted in fork 46 of yoke 4?. Within the opening 48 of yoke 41 is block 49 having a portion 50 closely fitting the grip block '49 or to allow said block to remain loose. A rod'53 has one end secured in block 49, the other endbeing secured to operating 1 member 54 having. an opening55at the lower end cause vibration of the clamp.

walls of opening 48. A bolt 5| threaded into the 1 f lower end of'said yoke is provided with ahead 52 whereby the yoke may be adjusted so as to accidental movement.

thereof bridging bar 56secured to extension 33 for operation of the button clamp. In an opening 5! in'member 54 is fitted'abar 58 which is is secured to the machine was to allow oscillation of member 54.

In a notch 60 in memberis a block 6| havlink B4. Also'held in slot 63 is a'second block 65 into which is threaded a screw 68 adapted to cause sliding of block 65 in'the slot. A set screw 65 is adapted to lock said block in adjusted position. A pin 61 extendingifromblock 65 op-; of stationary member 69, which I crates in groove 68 is fixed by extension 10 and screws II to the; head of the machine. At the forward end of bar I54 is'a lateral extension I2 having a-pin I3 fitting into plate I4 for oscillating movement.

A bar or lever I5, which is secured to plate 14 by screw 75', has a slot I6 therein and a block 'I'I slidably mounted for adjustment by screw 18.

Set screw TI is adapted to lock the block 11 into its adjusted positions.

adapted to fit into notch 8| in extension I0 when the block 11 isin inoperative position. When in operative position, pin 8!] cooperates with reciprocable support member'82 having an opening 83 and provided with a groove 84 for reception ofsaid pin. A rod 85 passing through opening 83 is secured to member 82, the upper part 86'thereof being provided with plate 81. Cam rollers 88 and 88' On said plate cooperate withcam faces 89 and 89' respectively of'the cam; 81'. Said cam is mounted on shaft 2| and operable simultaneouslywith cam 20.

The rear end 19 of barl A pin 80 isi ing pivoted thereto a rectangular extension 62 which fits into slot 63 in oscillating member or slot I I2. The free end I I3 of lever 96 is positioned The operation of the machine is as follows:

When it is desired to cause the button clamp to vibrate with each stitch, the set screw. 53 is loosened and rod 53 is shifted to give the desired throw of the button clamp, after which the set screw is again tightened. Bolt 5| is tightened to cause the yoke 41 to firmly rasp block 50. In this position the movement of member 40 will When it is desired to allow the clamp to remain stationary, bolt 5! is loos'ened so asto no longer transmit motion from member 4|], and end 93 of lever 9| is rotated about its pivot H5 to embrace pin 96." Screw 92 is tightened so that it contacts with the top of the button clamp to holdthe same against When it is desired to cause the needle bar to vibrate with each stitch, block 65 is moved so that pin 61 is engaged in groove 68. The positioning of pin 'B'I atvarious'points in the length a of the groove.will determine the throw of the needle bar. "When the pin is so engaged, reciprocation of member lllcauses reciprocationot block 62 which in turn causes oscillation of bar 64 around block 65 as'a pivot. This motion is transmitted through extension I2, plate I4, bar I5 and shaft 21 to the needle bar '8. Apertured extension IIB depending from plate 14 is operatively connected with the hook'mechanism (not shown) to cause the hook to be in time with the needle. When the needle bar'is not to vibrate, block 65 is caused to move to thelleft of Fig. 3 so that it is no longer engaged with groove 68. In that case reciprocation of block 62 merely causes oscillation of bar 64 around pivot I3 without transmitting any motion.-

' .When it is desired to cause'the needle bar to shift at predetermined intervals, pin 80 of block. 11 is caused to engage with groove 84 ofmember 82. .When' pin 61 is out of groove 68 and pin 80 is held in groove 84, the motion of lever 15 is transmitted to member H6 .to shift the hook mechanism, The exact positioning of the pin in the groove determines the throw of the needle bar; Since the movement of memberBZ is con- "On the button clamp 29 is pivoted lever BI having a vset screw 92 on an extended angular arm thereof for locking the same in desired position on the button clamp. The opposite end of SI is provided with a fork 93 which is adapted to embrace pin 94 on member 54; a j

Pivotedat 95 on the arm 3 is a horizontal lever 96 having a'pivot 9l to which is secured vertical operating bar .98 havingroller 99 at the lower end thereof. Said roller 'oper'atesin angular slot Illfl of plate Illl, which is mounted for lateral movement. A bar I02 pivoted at I03 is mounted in thelower end I04 of member 11. A fork I05 at the opposite end embraces follower 99. An ex tension IGGirom plate IIlI terminatesina cutting knife I01. The button clamp has a vertical bar I I I3 secured thereto and passing into the head.

4, and having an extension I I I extending through trolled'by cam faces 89 and 89,-as transmitted through followers 88 and 88', at thetime'member 82 moves either upwardly'or downwardly, bar I5 is causedto oscillate about shaft 21 due t the action of block H with member 82. When pin is in notch .8l bar 15 is in inoperative position and there is no oscillation of shaft 21.

Briefly, the structure is adapted for use in sewing either a two hole or four hole button. In sewing a two hole button the parts should be as in Figure 3 'with'pin 80 out of notch SI and with the button clamp operating connections inoperative whereby the needle will vibrate between the two holes in the button. Onthe other hand, the clamp operating connections may be rendered operative and the pin 6'! moved out. of groove 68 whereby the needle will reciprocate vertically only and the button will bemoved by-the clamp in sewing a. two hole button; Z 1

' In sewing a four hole button the clamp operating connections should be operative for moving the button for sewing through two of four holes therein. In this instance, pin B'Ishould be vals for sewing through the secondtw holes of a four hole button, the clamp continuing to oscillate the button for the sewing through the second pair of holes.

At the end of a stitching cycle, cam 20 causes operation of stop H, which movement is coordinated with the shifting of the needle bar, since both cams 20 and 89 are fixed to the same shaft 2|, V

As the stop I! moves upwardly, it pulls follower 99 downwardly first through the angular portion of slot IOU, which shifts plate l! to the left of Fig. 1, causing operation of knife I07 to cut thread. Simultaneously therewith, there is do ward movement of rod 98 which, through linkages 91, 95 and H3, presses upwardly on extension Ill thus raising the button clamp simultaneously with the stopping of the machine. In Fig. 1 the positions of the elements are shown after the completion of the aforesaid operation. To start the machine, chain H5 is pulled down causing follower 99 to move up and knife I 01 to be retracted.

Although I have described the invention setting forth a single embodiment thereof, it is apparent that various changes and modifications in the details thereof may be made within the spirit of the invention. For instance, although the machine has been described in connection with its use for sewing buttons, it is quite obvious that at least some of the parts of the mechanism may be used with machines for other purposes. In place of the button clamp, there may be provided the ordinary Dresser-foot which is so linked with the remainder of the mechanism as to be automatically raised at the end of a stitching cycle, These and other changes may be made in the details of the invention without departing from the spirit thereof, the scope of the invention being defined by the claims appended hereto.

What I claim is:

the

1. In a sewing machine having a rotating main shaft and stitch-forming mechanism operated thereby including a reciprocating needle bar, means for shifting said needle bar at predetermined intervals comprising an oscillating shaft operatively attached to said bar and having an operating lever connected therewith, a cam rotated by said main shaft, a follower cooperating with said cam, a connecting link between said follower and said lever to transmit reciprocating motion of said follower into oscillation of said needle bar, said link being pivoted at an inter- 4 mediate point to a fixed support and being pivoted at its ends to said lever and follower respectively.

2. In a sewing machine having a rotating main shaft and stitch-forming mechanism operated thereby including a reciprocating needle bar, means for shifting said needle bar at predetermined .intervals comprising an oscillating shaft operatively attached to said bar and having an operating lever connected therewith, a cam rotated by said main shaft, a follower cooperating with said cam, a connecting link between said follower and said lever to transmit. reciprocating motion of said follower into oscillation of said needle bar, said link being pivoted at an intermediate point to a fixed supportand being pivoted at its ends to said lever and follower respectively, said, intermediate pivot of said link being adjustable to vary the throw of said bar.

3. In a sewing machine having a rotating main shaft and stitch-forming mechanism operated thereby including a reciprocating needle bar, means for shifting said needle bar at predeteroperatively attached to said barand having an operating lever connected therewith, a cam ro- I tated by said main shaft, a'follower cooperating with said cam, a connecting link between said follower and said lever to transmit reciprocating motion of said follower'into oscillation of said needle bar, said link being pivoted at an intermediate pointto a fixed support and beingf-piv oted at its ends to said lever and follower respectively, said intermediate pivot of said link being adjustable to vary the throw of said bar and means for rendering said intermediate pivot inoperative so that motion of said cam is trans-' mitted to said link but not to'said bar.

4. In a sewing machine having a rotating main shaft and. stitch-formingmechanism operated thereby including a reciprocating needle bar, means for shifting said needle bar atpredetermined intervals comprising an oscillating shaft operatively. attached to-said bar and having an operating lever connected therewith, a cam ro tated by said main shaft, a follower cooperating operating leverconnected therewith, a cam rotated by saidmain shaft, a follower co-operating with said cam, a connecting link between said follower and said lever to transmit reciprocating motion of said follower i'n'to'oscillation of said needle bar, said link comprising an oscillating lever, one end being pivoted to said follower and the other end being pivotally connected to one end of said first lever, and said second lever having an adjustable intermediate pivot adapted to' be rendered inoperative so that motion of said cam merely causes oscillation of said second lever about its pivotal connection with the first lever.

6. In a sewing machine having a rotating main shaft and stitch-forming mechanism operated thereby including a reciprocating needle bar, means for shifting said needle bar at predetermined intervals comprising an oscillating shaft operatively attached to said bar and having an operating lever connected therewith, a cam rotated by said main shaft, a follower co-operating with said cam, a connecting link between said follower and said lever to transmit reciprocating motion of said follower into oscillation of said needle bar, said link being pivoted at an intermediate point to a fixed support and being pivoted at its ends tosaid lever and follower respec tively, said intermediate pivot being adjustable to vary the throw of said ban-said pivot includ-' ing a stationary grooved guide, a movable block having a pin operating in said groove, and a slot in said link into which said block is movably fitted.

7. In a sewing machine having a rotating main shaft and stitch-forming mechanism operated thereby including a reciprocating needle bar, means for shifting said needle bar at predetermined intervals comprising an oscillating shaft I operatively attached to said bar and having" an mined intervals comprising an oscillating shaft" operating lever connectedtherewith, a cam rotated by said main shaft, a follower co-operating with said cam, a connecting link between said follower and said lever to transmit reciprocating motion of said follower into oscillation of said needle, bar, said link being pivoted at an inter- 1 mediate point to a fixed support and being piv- 1 oted at its ends to said lever and follower respectively, said intermediate pivot being adjustable .to vary the throw of said bar, said pivot including a stationary grooved guide, a movable block hav- 1 ing a pin operating in said groove, aslot in said link into which said block is movably fitted, and

a screw threaded through said link and into said block for adjusting the same.

8. .In a sewing machine having a rotating main shaft and stitch-forming 'mechanism operated thereby including a reciprocatingv needle bar, means for shifting said needle bar at-predetermined intervals-comprising an oscillating shaft operatively attached tosaid bar and having an operating lever connected therewith, a cam rotated by said main, shaft, a follower co-operating with said cam, a connecting linkobetween said follower and said lever to transmit reciprocating v motion of said follower into oscillation of said needle bar, said link beingpivoted at. an intermediate point to a fixed support and being pivoted at its ends to said lever and follower respectively, said intermediate pivot being adjustable in said;fixed support to vary the range ofsaid oscillating shaft, and means selectively operable for reciprocating said lever at predetermined intervals to shift said bar.

9. In a sewing machine having a rotating main 1 shaft and stitch-forming mechanism operated thereby including a reciprocating needle bar, means forv shifting said needle bar atpredetermined intervals comprising an oscillating shaft operatively attached to said bar and having an operating lever connected therewith, a cam r, tated by said main shaft, a follower co-operating with said cam, a connecting link between said fol-1- lower and said lever to; transmit reciprocating motion of said follower into oscillation of said needle bar, said link being pivoted at an intermediate point to a fixed support-and being pivoted at its ends to said lever and follower respectively, means for adjusting the position of said intermediate pivot to vary the throw of said link, said intermediate pivot being adjustable in said fixed support to vary the range of said oscil lating shaft, and means selectively operable for reciprocating said lever at predetermined intervalsto shift said bar.

10. In a sewing machine having a rotating main shaft and stitch-forming mechanism operated thereby including a reciprocating needle bar, means for shifting said needle bar at predetermined intervals comprising an oscillating shaft operatively attached t said bar and having an operating lever connected therewith, a camrotated by said main shaft, a follower co-operating with said earn, a connecting link between saidfollower and said leverjto transmit reciprocating motion of said follower into oscillation of said needle bar, said link being pivoted at an inter mediate point to a fixed support and being pivoted at its ends to said lever and follower respectively, said support having a grooved guide, said intermediate pivot adjustably held in said guide to vary the throw of said link, said intermediate pivot being adjustable in said fixed support to vary the range of said oscillating shaft, andmeans means for shifting said needle bar atpredetermined intervals comprising an oscillating shaft operatively attached to'said bar and having an operating lever connected therewith, a cam rotated by said main shaft, a follower co-operating with said cam, a connecting link between said follower and said lever to transmit reciprocating motion of said follower into oscillation of said needle bar, said link being pivoted at an intermediate point t a fixed support and being pivoted at'its ends to said lever and follower respectively, said intermediate pivot being adjustable in said fixed support to vary the range of said oscillatingshaft, and means selectively operable for reciprocating said leverat'predetermined intervals to shift said bar, including a pivot pin extendingfrom said lever and removably held in a reciprocable support member. f

, 12. In a sewing machine having a rotating main shaft and stitch-forming mechanism operated thereby including a reciprocating needle bar, means for shifting said needle bar at predetermined intervals comprising an oscillating shaft operatively attached to said bar and having an operating lever connected therewith, a cam rotated by said main shaft, a follower co-operating with said cam, a connecting link between said follower and said lever to transmit reciprocating motion of said follower into oscillation of said j needle bar, said link being pivoted at an intermediate point to a fixed support and being pivoted at its ends to said leverand follower respectively, said' intermediate. pivot being adjustable in said fixed support to varyv the range of said oscillating shaft, and means selectivelysoperable for reciprocating said lever at predetermined intervals to shift said bar, including a pivot pin extending from said lever and removably held in a reciprocable support member, a second cam and follower operated by said main shaft, said second follower being connected to said reciprocable support members I 13. In a sewing machine having a rotating main shaft and stitch-forming mechanism operated thereby including a reciprocating needle bar,

means for shifting said needle bar at predeter-.

mined intervals comprising an oscillating shaft operatively attached to said bar and having an Y operating lever connected therewith, a cam ro-v tated by said main shaft, a follower co-operating with said cam, a connecting link between said follower and said lever to transmit reciprocating motion of said follower into oscillation of said needlebar, a button clamp, and means secured to said follower tocause vibration of said clamp including a connector bar having one end pivoted in said follower, a yoke pivoted to the other end of said connector bar, an operating rod adjustably secured to said yoke, means for clamping said rod in said yoke, and a connection between said rod and said clamp.

14. In a sewing machine having arotating main shaft and stitch-forming mechanism operated thereby including a reciprocating needle bar,

means for shifting said needle bar at predetermined intervals comprising an oscillating shaft operatively attached to said-bar and having an operating lever connected therewith,'a cam rotated by said main shaft, a follower co-operating with said cam, a connectinglink between said follower and said lever to transmit reciprocating motion of said follower into oscillation of said needle bar, a button clamp, and means secured to said link to cause vibration of said clamp including a. connector bar having one end pivoted in said follower, a yoke pivoted to the other end of said connector bar, an operating rod adjustably secured to said yoke, means for clamping said rod in said yoke, and a connection between said rod and said clamp having means for adjusting the throw of said clamp.

15. In a sewing machine having a rotating main shaft and stitch-forming mechanism operated thereby, a cam operated from said shaft; a stop adapted to be released by said cam for stopping the operation of said machine,'a retractable member for holding fabric being sewed, a linkage connected to said stop and to said member, whereby operation of said stop causes lifting of said member and release of said stop causes lowering v of said member, said linkage including a plate having an angular slot therein, a linkage pin operating in said slot, a thread cutter secured to said plate, the movement of said pin causingshifting of saidcutter and then lifting of said member.

- JACOB BRUSSELL.

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