Патент USA US2121652код для вставки
June 21, 1938. ' ' HfE. COOPER 2,121,652 TAKE-UP MECHANISM FOR sswme MACHINES Filed Jan. 25, 1937 ‘luv 14 J62 10 20 ' ‘ '/ £6 v / I m Patented June 21, 1938 ‘ 2,121,652 (1 UNITED STATES PATENT OFFICE‘ 2,121,652 TAKE-UP MECHANISM FOR SEWING MACHINES Harold Edmund Cooper, Kettering, England, as signor to United Shoe Machinery Corporation, V a Paterson, N. J., a corporation of New Jersey Application January 23, 1937, Serial No. 122,003 in Great Britain February 5, 1936 7 claims; (01. 112-57) 5 This invention is concerned with improvements in or relating to sewing machines and is particu larly, but by no means exclusively, concerned with improvements in or modi?cations of rotary take-up mechanism of the kind described in U. 5. Letters Patent to Keall et al., No. 1,941,943, dated January 2, 1934, to Gouldbourn et al. No. 2,056,670 dated October 6, 1936, and to Gould~ bourn et al. No. 2,049,369 dated July 23, 1935 which includes a thread engaging member moved during the machine cycle, at one time to pull the thread and at another time to give ‘up thread, in a continuous closed path which is not a circle. In a high speed machine constructed as dis 16 closed in Patent No. 2,056,670 and modi?ed as in Patent No. 2,049,369 and having a rotary take up of the kind above referred to, the rotary take up mechanism operates during the machine cycle to give up needle thread while a loop of needle ,5, tary take-up mechanism a yield which is effective at the time in the operation of the machine when the loop of needle thread is acting to pull the shuttle thread hard against the work just prior to the actual setting of the stitch, which yield ’* then acts to minimize any snatch with which the loop of needle thread may be pulled downwardly by the take-up device due to the sudden resist ance o?ered by the work to the continued down ward movement of the needle loop. In its broad er aspects, thev invention is not limited to use with a continuously rotating take-up mechanism in a lockstitch sewing machine of the kind re ferred to, but is applicable for use with other forms of take-up mechanism and in other types '15 of sewing machines. - ' In order that the nature of the present inven— tion may become more clear, the illustrative em bodiment aforementioned will now be described 20 thread is passing over the shuttle and then pulls in connection with the accompanying drawing. an the loop of needle thread passed over the shut In the drawing: tle down to lay the shuttle thread which it Figure 1 shows in right side elevation a form of straddles on the Work and thereafter pulls the take-up embodying the present invention as ap loop of needle thread into the work to set the plied to an outsole stitcher; and Figure 2 is a 25 stitch. During operation of such a machine sectional view on the line 11-11 of Figure l. as there sometimes occurs breakage of the needle The form of rotary take-up device illustrated thread, particularlywhen a waxed needle thread in the drawing will be described as applied to a is being used, near to the upper surface of the lockstitch outsole stitcher generally similar in work and close to that portion of the loop of operation to the machine described in the pat 30 needle thread which actually engages the shut ents above referred to. This machine is pro :30 tle thread when the needle loop is pulled down, vided with a curved hook needle 10, a lcoper l2, to set the stitch by the rotary take-up. a thread lifter l4, a shuttle l6, a thread ?nger The more frequent breakage of waxed needle It, a Work support 20, and a presser-foot 22. In thread at this time in the operation of the ma the illustrative embodiment there is rotary pin 35 chine is due, to some extent, to the fact that ion 24 movable bodily in a circular, path similar when thread has been waxed the‘ thread becomes to that ‘indicated at 69 in U. S. Patent No. 1,941, somewhat brittle and is therefore liable to break 943, and a disc 26 similar to that indicated at 75 in under a sudden strain and further, owing to the the latter patent. The pinion 24 and the disc 26 comparatively high speed at which the machine are, in the present illustrative embodiment not 40 operates, to the fact that the rotary take-up secured together in the manner disclosed in U. pulls the loop of needle thread very rapidly down 5. Patent No. 1,941,943, but can move relatively towards the work with the result that the sudden about the rotary axis of the pinion 24 by rea resistance offered by the work to the continued son of a yielding connection between the pinion downward movement of the loop, after the shut and disc. The pinion 24 in the illustrative em " tle thread has been laid upon the work, causes the needle thread to break. One of the several objects of the present inven tion is to prevent, during the operation of a sew ing machine having a rotary take-up mechanism bodiment is secured on a hollow spindle 28'ro tatably mounted in a casing 29, similar to that indicated at 61 in the patent last referred to, in place of the pin indicated at ‘H in said patent. The hollow spindle 28 has formed on its right hand end, viewing the rotary take-up mechanism of the kind referred to, breakage of needle thread from taking place in the manner aforesaid, as will hereinafter appear from the following de~ scription. The above and other objects are sought to be achieved in an illustrative embod about one quarter of an inch thick, about seven iment of the invention by providing in the ro eighths of an inch in width, and about one inch from the front of the machine, a head or block 39. The head 30 is substantially in the form of a rectangle with rounded ends, the head being 2 , 2,121,652 and a quarter in length. The opposite sides of the head are bevelled off slightly to form faces as shown at 3|, 3| from the middle of the head towards its opposite ends so that the angle sub tended between the opposite end portions of each side is some 175 degrees, the opposite ends of the head being therefore somewhat narrower than the middle portion. The disc 26 of the present illustrative em 10 bodiment, which is the counterpart of that re ferred to as 15 in the latter patent carriesa thread engaging take-up roll 32 mounted eccen trically to the spindle 28 similar to the roll indi cated at ‘ll in said patent and has extending 15 from the centre of one side face of it a pin 34 which enters into a hollow of spindle 28 with 7 freedom for rotary movement therein. Formed in the side of the face of the disc 26 from which the pin projects (1. e., the side nearer the said 20 head) is a recess 35 which receives the afore said head 30 on the hollow spindle 28, the width of the recess being equal to that of the widest part of the head on the hollow spindle. The, recess 36 in the disc is rectangular and the pin 25 34 which projects from the disc passes through the mid-portion of the recess. As will have been seen in Figure l, the end portions at the opposite sides of the head on the aforesaid hollow spin dle 28 are so bevelled off that a small amount, :30 about ?ve degrees, of relative rotary movement may take place about the axis of the hollow spin dle 28 between the head 30 on the hollow spindle and the disc 26 in which is the recess and which carries the take-up roll 32, the amount of rotary movement being limited between two positions by contact of the opposite bevelled end portions of the head with the opposite sides of the recess. Due to the eccentricity of the roll 32 to the spin ?dle 28, rotary movement between the spindle and 40 disc causes the roll to move bodily relatively to the rotary axis of pinion 24, the amount of thread taken up by the roll being changed cor respondingly. The pin 34 is prevented from end wise movement in the hollow spindle 28 by a pin 38 passing laterally through the hollow spin dle and through a recess 40 in the pin 34, which recess allows the relative rotary movement be tween'the pin and spindle to take place. To enable the take~up roll 32 to exert a yield 50 ing pull on the thread, the head 30 on the hol low spindle has formed in it, at right angles to its length, a closed bore which receives a com pression spring 42. The spring 42 presses against one side of the recess 35 in the disc 26 and tends .55 to hold the disc at one end of its rotary move ment relatively to‘ the head and thereforeyto hold the take-up roll in ‘a normally ?xed posi tion relatively to the hollow spindle. The construction of the illustrative embodi .60 ment has for convenience been described in con nection with a rotary take-up mechanism like that described in U. S. Patent No. 1,941,943, but it will be understood that the illustrative em 65 bodiment may equally well be used in the similar shown in Figure 50 of thedrawing of said Pat ent No. 2,056,670. During the time in the cycle of the machine indicated by the dot-and-dash lines A in Figure 1 of the accompanying drawing during which the take-up roll 32 is moving downwardly, as shown in Figure 3 of the drawing of Patent No. 2,056,670 in which ?gure the take-up rotates in aclockwise direction, and is drawing the loop of needle thread which has been passed over the shuttle down towards the work, preparatory to the setting of the stitch, i.- e., during the move ment of the take-up from about 280 degrees to about 350 degrees in the diagram shown in said Figure 50, the take-up roll 32 occupies a position more rearward in the machine than the axis of the disc 26 which carries the roll and while, dur ing this time, the take-up rotates in a clockwise direction, the take-up roll 32 is, besides being carried bodily round by the take-up mechanism, 20 being rotated in a clockwise direction about the axis of the disc, i, e., it is being carried towards the forward side of the axis of the disc. During this part of the movement of the take-up roll the spring 152 in the head 30 on the hollow spin 2.5 dle is inoperative and merely holds the disc carrying the take-up roll at the limit of its coun terclockwise movement about the axis of the said spindle, its angular position relatively to the ' spindle being then determined by contact between one of the bevelled faces 3i on the head 30 of the spindle and one side of they recess 35 in the disc 26 which carries the take-up roll. The ar rangement is such that any resistance then o?ered by the thread to the movement of the take-up 35 roll during this part of the movement of the take-up roll tends to move the take-up roll in a counter-clockwise direction about the axis of the disc and to hold the said bevelled face on the head more ?rmly against the side of the recess with the result that the loop of needle thread is pulled positively down towards the work. ' p - At the time when the take-up roll has just pulled the loop of needle thread down and laid 45 the shuttle thread on the work which occurs at about 350 degrees of rotation of the main shaft of the machine from its initial position, the take up roll 32 will havebeen advanced downwardly and forwardly both by bodily movement of the 50 pinion 2% as the take-up mechanism rotates and by movement of the roll 32 about the axis of the disc 26 which carries'the roll into a position in which upward pressure exerted on the roll, due to the resistance o?ered to movement of the roll 55 by the tensioned thread, tends to move the take-. up roll in a clockwise direction about the axis of the said hollow spindle 28. The resistance of the loop of thread to downward movement of the take-up roll tends, by the consequent upward .60 reaction exerted on the roll, at this time, to cause the disc 25 carrying the roll 32 to move in a clockwise direction about the axis of the hollow spindle 28 against the action of the spring 42 which normally urges the disc in a counterclock rotary take-up mechanism described in Patent wise direction aboutsaid spindle. The extent to No. 2,056,670 and its operation will now be de scribed in relation to a machine and take-up mechanism as described in said. latter patent, in which the thread handling and work feeding in axis of the spindle is limited by contact of an other of the bevelled'faces 3! on the spindle head strumentalities (except in so far as the thread handling instrumentalities are modi?ed in the manner disclosed in Patent No. 2,049,369) op erate at the approximate times in the machine 175 cycle described with reference to the diagram 65 which the disc can so move angularly about the 30 with a side of the recess 36 in the disc 26 and, 70 as before indicated, is approximately some ?ve degrees. .During such movement of the disc rel atively to the spindle, the take-up roll, which as before stated vwill then lie at the forward side of the axis of the spindle; will rise slightly (e. g., 3 2,121,652 some as? of an inch) towards the work out of the path, indicated at D, it would otherwise follow and thus relieves to a small, but nevertheless measurable, extent the tension exerted on the thread at this time. Thus during a part of the movement of the take-up roll when the'roll is acting to set the stitch which part extends from between about 350 degrees to 10 degrees in the diagram, providing the machine makes more 10 than a complete cycle, the roll 32 can yield to relieve any sudden tension on the thread against the action of the spring in the head on thehol low spindle. Before the roll reaches the posi tion, indicated by the full lines B in Figure 1, 15 in which it actually completes the setting of the stitch, however, the yield between the disc and spindle will normally have been completely taken up so that in completing the stitch setting the roll pulls positively on the thread. After the 20 stitch has been set and the take-up mechanism continues to rotate, the take-up roll gives up needle thread to the thread handling instru mentalities and during this thread giving-up part of the movement of the take-up roll, indi 25 cated by'the dot-and-dash lines C in Figure 1, such strain as was imposed on the thread during the major portion of setting of the stitch is re lieved and, if the take-up roll has yielded against the action of the spring 42 in the head on the 30 hollow spindle, the spring once more rotates the disc carrying the roll in a counterclockwise di rection about the spindle and returns the roll to its original position relatively to- the spindle. ‘There is thus provided a yielding means in the 35 take-up mechanism which is inoperative during the greater portion of the pulling down of the 55 60 ing on the thread engaging member to permit a limited bodily movement of the thread engaging member about the axis of rotation of the rotary member under the pull exerted on the thread during the setting of a stitch. 4. A shoe sewing machine having, in combina 10 tion with the other stitch forming devices, a take up comprising a rotary member arranged to move bodily in a circular path, a thread engaging member mounted eccentrically on said rotary member, and means for rotating said rotary 15 member comprising a yielding connection per mitting a limited rotary movement of said mem ber under the pull exerted on the thread during the setting of a stitch. 5. A shoe sewing machine having, in com 20 bination with the other stitch forming devices, a take-up comprising a rotary driving member arranged‘ to‘ move bodily in a circular path, a thread engaging member mounted eccentrically to the axis of rotation on the rotary driving 25 member, and a yielding connection for causing the thread engaging member to exert a positive pull on the needle thread while the resistance o?ered by the thread tends to move the thread engaging member in one direction about the axis 30 of rotation of the rotary member, and to exert a yielding pull on the needle thread while the resistance offered by the thread tends to- move the thread engaging member in the other direc 35 tion. 6. A shoe sewing machine having, in combina tion with the other stitch forming devices, a take passed over the shuttle but may become auto up comprising a rotary driving member arranged matically operative substantially at the time when 50 ber mounted eccentrically to the axis of rotation on the rotating member, and yielding means act loop of needle thread after the loop has been 40 the loop lays the shuttle thread' ?rmly against 45 up comprising a rotary member arranged to move bodily in a circular path, a thread engaging mem to move bodily in a circular path, a thread en gaging member, a spindle concentric with the 40 rotary member on which the thread engaging member is eccentrically mounted for bodily move ment relatively to the rotary member, means for limiting the bodily movement of the thread en gaging member between two positions about the 45 spindle relatively to the rotary member, the re~ sistance oifered by the thread tending to hold the thread engaging member in one position while the take-up pulls the needle loop towards the work and in the other position while the take 50 up sets the stitch, and spring means for holding the thread engaging member in the position as the work and during the setting of the stitch, which yielding means may then yield and thus tend to prevent undue strain on and consequent breakage of the needle thread and in which, at a time when setting of the stitch is being com pleted, the yield will normally have been taken up so that the stitch is ?nally set by a positive pull on the needle loop by the take-up roll. The nature and scope of the invention having been indicated, and a form of the invention hav ing been described, what is claimed is: 1. A lockstitch shoe sewing machine having, in combination with the other stitch forming de vices, a take-up comprising a thread engaging member, and mechanism for actuating the thread engaging member to pull the needle loop from the shuttle into the work and to set the stitch comprising yielding means rendered inoperative while the thread engaging member is pulling the needle loop from the shuttle and rendered op erative as each stitch is being set to relieve sudden thread engaging member eccentric to the axis 60 of rotation of the rotary member, a spindle con nected to the rotary member, a block on the tension on the thread. spindle formed with an end narrower than an 2. A lockstitch shoe sewing machine having, in combination with the other stitch forming de 65 vices, a take-up comprising a thread engaging member, and mechanism for actuating the thread engaging member to pull the needle loop into the work and to set the stitch including a spring for causing the thread engaging member to exert a 70 yielding pull on the needle thread, and means for limiting the yielding pull exerted by the spring to insure that the stitch will ?nally be set with a positive pull. 3. A shoe sewing machine having, in combina 75 tion with the other stitch forming devices. a take_ sumed while the take-up pulls the‘ needle loop towards the work. '7. A shoe sewing machine having, in combina tion with the other stitch forming devices, a take-up, comprising a rotary driving member arranged to move bodily in a circular path, a other portion thereof, a supporting disc for the thread engaging member formed with a recess loosely surrounding the block, the width of said recess being substantially equal to the widest part of the block to permit the disc to pivot about the widest part of the block between positions determined by engagement of the end of the block with the sides of the recess, and spring 70 means acting between the block and the disk to hold the thread engaging member yieldingly in position relatively to the rotary member. HAROLD EDMUND COOPER.