US1824063A - Sewing machine - Google Patents

Description

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F. ASHWORTH SEWING MACHINE Original Filed May 19, 1920 14 Sheets-Sheet i4 Patented Sept. 22, i 1931 I UNITED; STATES P T.el rr oFrlcE FRED nsnwonrn. or BEVERLY, massacnosm'rs, ass renon To UNITED snot: m-

CHINEEY CORPORATION, or PATERSON, 1\ IEW JERSEY, a CORPORATION 01 NEW JERSEY SEWING MACHINE Application filed ma 19, 1920, semi No. 382,558. Renewed mmiaii 22, 1926.

The present invention relates to sewing machines and'more particularly to lock stitch outs'ole shoe sewing machines which are pro- V vidled with a curved hook needle and a curved aw 6 l The object of the present invention is to simplify and improve the construction and inode of operation of sewing machines particularly of the type referred to. ith this object in view'the featuresfof the present invention consist in certainconstructions, ar rangements and combinations of'partshereinafter described and claimed, the advantagesof which will be obvious to those skilled in'the ai't.. l u The several features of the present invention-will be clearly understoodfrom the following description and accompanying drawingsinwhich: I, .Figure 1 is a front elevationof a lock stitch outsole shoesewing machineembodying. the features in their preferred form; Fig. 2 is a right side elevation; Fig. 3 is a face view of astop cam and'its follower forming parts '4 is a rear elevation of themachine; Figs. 5

and 6 are right and left side elevations on an enlarged scale of the head of the machine; 7 Fig. 7 is a vertical sectional view taken subfront elevation of'the take-up shown at the l mit of its retracting movement; Fig. 13 is a vertical sectional view .of a portion of the presser footactuating mechanism with the partsshown in the position that they assume when the needle is at the limit of its loop drawing stroke; Fig.- 14 is a similar view of the presser foot actuating mechanism with the parts shown in the positionthey assume immediately after the needle has reached the ofthe stop mechanism of the machine Fig.

stantia-lly on the line 77 of Fig. 1; Fig. 8

10, respectively, of 5; Fig. llis a r limit of its work piercing stroke; Fig. 15 is a detailed sectional view taken on the line 15-15 of Fig. 9; Fig.16- is a. detailed section- :11 view taken on the line 1616 of Fig. 5; Fig. 17 is avertical sectional view, partly in elevation, of'the shuttle mechanism'and other stitch forming devices looking toward theright of the needle; F ig. 18 is a front view of a portion of the shuttle mechanism illustrated in Fig. 17; Fig. 19 is a view similar to Fig. 17 but looking toward the left.

mounted the needle, awl, thread hook, fudge knife and edge-gage; Fig. 21 is a detailed transverse sectional view of the bobbin case looking toward the rear of the machine; Fig.

22 is'a rear elevation of the bobbin case Fig, '23, is a vertical sectional view of a portion of ".the driving and 'stoppingmechanism'of the machine taken on the line 2323 of Fig. 4;

Fig. 24 is a sectional view taken on the line 2424= of Fig. 23; and Fig. 25 is a sectional plan view taken on the line 2525 of Fig. 23.

In the sewing machine. illustratedin'the drawings, the Work is fed by means of a work 1 support and presser foot while the needle and awl are out of the work. At the completion of the feeding operation the awl is actuated to pierce the work and as the awl retracts the needle closely follows theawl through the work. During the feeding operation and during the described movements of the awl and needle, the work is firmly clamped onthe work support by the presser foot. At the limit of the work iercing stroke of the needle, the pressure of the presser foot on the work is relieved and the presser foot and work support are returned to their initial "position whereupon the lpresser foot 1s again caused to clam the wor firmly on the work support. As t e needle is in the work during the back feeding or retraction of the work support and presser foot, there is no danger of the Work becoming dislodged by the work support and presser foot being drag ed over the work, and the needle is supporte at this en the work support and presser foothave been retracted and the presser foot is .,caused to clamp the work on the work support, the loop drawing stroke of the needle is initiated. f

The construction of the work support and presser foot, and their actuating mechanism is such that there is no danger of any back lash occuring even whenthese parts become worn with use. The feeding of the work by means of thework support and presser foot permits the awl and needle to be in alinement at all tilnes so thatthere is no danger of the needle failing to accurately enter the hole made by the awl as frequently occurs in machines in which the awl is employed to feed the work.

The work support is indicated at 2 and the presser foot is indicated at 4 (Figs. 1, I and 10). The work support is shaped as usual to enter the crease between the welt and the upper and to cooperate with and edge gage 6 to guide the work. The work support is provided with the usual slot 8 through which the needle and awl work and through which a fudge or channel knife 10 for the welt extends. The work support isecentrally formed on a curved bar 12,the ends of which are secured to arms 14 projecting forwardly from a work support carrier .16. I i

It is customary in sewing about the fore- I part of a shoe to guide the shoe by means of the edge gage but as it is desirable, particularly on womens shoes, to make the line of stitches closer to the upper at the shank than about the forepart of the shoe, the edge gage is retracted when the shank is reached to permit the shoe to be guided by the work support. In the illustrated machine, in order that the line of stitches may be made as close as desired to the upper at the shank of the shoe, the work support has provision for adjustment in the plane of its work supporting.

surface. To this end, the curved bar 12 is adjust-ably secured to the arms 14 by means of horizontal pins 18 projecting from the ends of the curved bar engaging split clamping collars formed on the ends of the arms 14.

' The arms 14 are spaced at a distance to permit the looper 20 and partsof-the actuating mechanism for the needle and awl to oper-. ate between them.

In order that the work support may be actuated to feed the work, the carrier 16 is pivotally mounted on a vertical pin 22 supported by the frame of the'machine and spaced at a distance from the end of the work support (Figs. 6, 7, 8, 9 and 10). The forward-end of the carrier 16 is supported by means of a bracket 24 thatis provided with a flattened surface with which flattened surfaces formed on the under sides of the arms 14 are in slid- In order to move the presser foot 4 laterally with the work support to feed the work, it is formed on the end of a lever 26 which is pivotally mounted on an uprightbracket 28 projecting fromone of the arms 14. I

The carrier 16 is moved about its pivot to feed the work by means ofhorizontallyreciprocating blocks 30 (Figs. 7 ,8 and 9) which are pivotally mounted on the ends of a vertiing movement will be imparted to the work support and presser'foot. The pivot pin 32 is actuated to impart the desired feeding movements to the work support and presser foot by means of a link 40 on the forward end of which the pivot pin is formed. Therear end of the link 40 is pivotally connected to J M anarm 41secured to the upper end of a vertical rock shaft 42 mounted in the frame. An arm 43 is secured to the lower end of the rock shaft 42 and is provided with a cam roll v which engages a groove in a cam disk 44 carr1ed by a driving shaft 46 of the machine.

In order to adjust the length of the feed,-

the grooved block 38 is adjustable to vary the relative angular positions of the grooves 34 and 36. The block 38 is pivotally 'mounted by means ofa stud 48 projecting from the top thereof engaging a socket bearing in the framevof the machine, and its rear end is pivotally connected to the bifurcated end of a sleeve 50. The'other end of the sleeve 50 is split and embraces the rear end of a rod-52 (Fig. 15), the sleeve being securely clamped to therod by means'of a bolt 54. The rod 52 is screw-threaded through a sleeve 56 mounted to turn in a bearing in the frame and is held from longitudinal movement by nuts 58 threaded on its inner end and by a pinion 60 secured to its forward end. By turning the sleeve56, the block 38 may be adjusted to vary the length of the feed. In order that the operator mav conveniently effect such adjustment of the block 38, the sleeve 56 is adapted to be turned by means of a hand lever 62 (Figs. 1 and 10) secured to the right hand end of a rock shaft 64 mounted in the frame. The connection, between the sleeve 56 and the hand lever 62 comprises a gear segment 66 engaging the pinion 60, which gear segment is formed on the end of an arm secured tothe rock shaft 64. The grooved block 38 is adapted to be adjusted independ ently of the handlever 62 to vary the length of the feed. This may be accomplished by loosening the clamping bolt 54 and turning the rod 52 in the sleeve 56, a screw driver slot gage the work by means of a coiled spring 70 connected with the rear end of the presser foot lever 26 so that the presser foot will offer practically no resistance to the back feeding or retracting movement of the work support and presser foot. At the end of the retracting movement of these parts, the presser foot is pressed into engagement with the 7 work with a comparatively heavy pressure so as to clamp the stock firmly against the work support and is then locked in position. The presser foot remains locked until the end of the feeding operation when it is again unlockedand the cycle of operations repeated.

The locking mechanism for the presser foot comprises a wedge block 72 F igs. 7 and 10) the upper end of which engagesthe rear end of the presser foot lever. The lateral faces of the wedge block 72 are preferably arranged at a relatively small acute angle to each other, as shown in Fig. 7. A guide plate 74 secured to the frame is arranged to engage the forward faceof the wedge block and acts to limit the movement of-the wedge block laterally in one direction. A longitudinally movable lockingrwedge block 76is arranged to engage the rear face of thewedge block 72 to lock the same from downward movement. The locking wedge block 7 0 is mounted to slide on a vertical rod 78 secured to the frame. At the proper times during the operation'of the machine,the locking wedge block is movedupwardly and acts-through the wedge block 72 to clamp the presser foot upon the work. The block 76. is thus moved -upwardly by ineans of an arm 80, the for- 7 6 upwardly by means of a spring 92 coiled a about the" shaft and having one end connected to the arm 80 and its other end secured to the bearing sleeve 86. In order to vary the clamping pressure of the presser foot on the,

. work, the tension of the spring 92 is adjustable, and this is accomplished by loosening the bolt 90 and turning the bearing sleeve 86, a collar or nut being formed on the inner end of the sleeve for this purpose.

The presser foot is unlocked when the needle has reached the limit'of its work piere ing stroke, preliminary to the back feeding of the work support and presser foot, by mechanism connecting the rock shaft'84 with the needle actuating mechanism hereinafter described. This mechanism comprises a friction disk 94 (Figs. 10, 13 and 14) secured to the left end of the rock shaft 84, the periphery of which is adapted to be engaged by a friction shoe 96 to turn the rock shaft S t in the direction to lower the locking wedge block 76 in opposition to the torsion spring 92. The shoe 96 comprises a link having one end pivoted on a pin 97 extending between the arms of a yoke 98, the lower ends of the arms being joined by a bar 99 and the upper ends of the arms being loosely mounted on the rock shaft 81 at opposite sides of the disk 94-. The other end of the shoe 96 is pivotally connected with one end of a link 100 and the other end of the link 100 is pivotally'connected with the free end of an arm 102 projecting from a rocking sleeve 103 mounted on a shaft or rod 104 secured to the frame, the rocking sleeveforming a part of the needle actuating n1echanism, hereinafter described.

The friction shoe 96 is normally maintained in a certain position relatively to the cross bar 99 by means of a spring pressed plunger 105 mounted'in a longitudinal aperture in the friction shoe and engaging the cross bar 99, the plunger acting to maintain a stop lug 106 formed on the lower end of the friction shoe in engagement with the cross bar. Vhen the needle is at the limit of its loop drawing movement, the friction shoe 96 and the link 100 are substantially in alinement, as shown in Fig. 13. During the Work piercing stroke of the needle, the rocking sleeve 103 acts to swing the yoke 98 downwardly, the friction shoe being maintained by the plunger 105 in its normal position relatively to the cross bar 99 until the cross bar engages a yielding stop 108. The continued move ment of the link 100 after the engagement of the cross bar 99 with the yielding stop 10S cooperates with the stop to turn the friction shoe about the pivot pin 97 against the action of the spring pressed plunger 105. This turning movement of the friction shoe brings an eccentric friction surface 107formed on .the shoe into engagement with the periphery of the disk 94, whereupon the continued movement of the link 100 acts through this engagement of the friction shoe with the friction disk to turn the shaft 84 in the direction to unlock the presser foot, which occurs near the limit of the work piercing stroke of the needle.

At the start of the loop drawing stroke of the needle, the rocking sleeve'103 is turned in the direction to swing the yoke 98 rearwardly out of engagement with the yielding stop 108, thereby permitting the friction shoe 96 to resume its normal, position. relatively to the cross bar 99 and out of engagement with the friction disk 94 to permit the presser foot to again clamp the work on the work support.

The yielding stop 108 comprises a plunger rod 110 (Fig. 6) mounted to slide in an aperture in the frame and is urged rearwardly by right-handv bracket arm 148. The needle guide 138 projects from a flange 160 on the inner end of the sleeve 154 which flange is adjacent the needle segment. The thread arm or hook 142 is carried by a collar or segment 162 journaled on the sleeve 154 between the flange'160 and the left-hand bracket arm 148. The edge gage 6 and the fudge knife 10 are mounted on the free endof an arm or segmeans of a spring 112 coiled about the rod ment 164 which is loosely mounted on a bearand engaging a shoulderon the rod, the rearward movement of the rod being limited by adjustable stop nuts 114 threaded on'the forward end thereof.

A treadle operated mechanism is provided to enable the operator to unlock and raise the prcsser foot and to release a thread locking device so that the work may be easily re-' moved and the requisite amount of thread pulled from the. supply. This mechanism comprises a treadle rod 120 (Figs. 2, 5 and 10) which ispivotally connected at 122 to the free end of an arm 124 loosely mounted on the presser foot controlling shaft 84. The upper end of the treadle rod 120 is pivotally connected with the rear end of a lever 126 pivoted on the machine frame and having its forward end arranged to engage the rear end of the presser foot lever 26. When the treadle rod 120 is raised upon actuating the treadle mechanism, the arm 124 is swung upwardly and acts through the engagement of a forwardly projecting lug 128 on the hub thereof with a lug on the locking wedge blockactuating arm 80,to lower the locking wedge block 76 thereby unlocking the presser foot, the

presser foot being then raised by the engagement of the lever 126 with the presser foot lever. The thread locking device that is released at this time and its connection with the treadle rod 120 will be hereinafter described.

-Upon. releasing the treadle mechanism, a

coiled spring 130 connected with the treadle rod acts to depress the rod, thereby allowing the shaft 84 to be turned by its spring in the direction to lock the prcsser-footin engagement with the work. i

The needle 136, ncedleguide 138, awl 140,

ledge gage 6, fudge knife 10, and a thread 150is screw-threaded through a coaxial aperture in the hub 156 of the awl segment 146 and is locked to the awl segment by means of a nut 158 threaded on itsouter end. The hub 156 of the awl segment is journaled in the ing 166 I formed onthe right-hand bracket arm 148, and said arm 164 is interposed be tween the awl segment and a shoulder formed on said bracket arm. With this construction it will be apparent that the instrumentalities above referred to are mounted in such a manner that the parts thereof will operate with certainty audsmoothness and that the liability of the parts becoming worn with use will structed and arrangedthat the needle and awl operate with ease, certainty and smoothness and-the mechanismstake up a minimum amount of space in the machine.

In lock stitch outsole shoe sewing machines,

it is desirable that the feeding devices shall be given as much time as'possible tofeed the work during a cycle of operations of the machine. In sewing machines of this type in which the work is fed by means of the work support and presser foot, it is obvious that the length of time that can be given to these parts to feed thework is dependent upon the length of time that both the needle and awl are out of the work. In the illustrated machine the mechanisms for actuating the needle and awl are so constructed and arranged that the needle and awl are bothout of the work while their actuating cranks are' travelling approximately 160, thereby giving the work support and presser. foot a comparatively long time to feed the work. V

The needle and awl actuating mechanisms in the'illustrated machine are also constructed and arranged in such a manner that both the work piercing, and retracting strokes of i the needle'andawl are made with rapidity, the needle closely follows the awl'as the awl retracts through the work and the needle is maintained at the limit of its work piercingstroke a sufficient length of time to give the work support and presser foot ample time to J its actuating crank,it will'be apparent from an inspection of the drawings that an idle backward and forward movement is imparted to the needle at the limit of its loop drawing stroke, this idle 'movement of the needle being provided in order to maintain the needle out of engagement with the work the-desired length of time and to causethe needle to operate in the proper timed relation to the awl.

This result is due mainly to the arrangement.

of the lever 178 with relation to the bell crank 17 4-17 5, the'arrangement being such that during the oscillating movement of the lever 17 8 in each direction the'pivotal connection of the link 17 6 with the'lever 178 crosses the line joining the pivot of the lever and the pivotal connection of the link 176 with the bell crank.

It will also be apparent that an idlejbackward and forward movement of a suflicient duration is im arted to the needle at the limit of its wor piercing stroke 'to givethe work support and presser foot the desired length of time to return to their initial positions after feeding the work. This idle backward and forward movement ofthe needle, however, is only through a suflicient distance to raise the work slightlyfrom the work support so that during the back feeding or retraction of thework support and presser foot the work support will not drag on the work, the backward part oftheidle move"- ment of the needle occurring at the start of the retraction of the work support and presser foot, and the forward part of the movement occurrlng at the limit of the retraction of the work support and. presser. foot,'the latter part of the movement acting to again bring the work down upon the work .support. This result is duemainly to the arrangementofthe bell crank 174-175 with relation to'the needlesegment, the arrangement being such that during.,the oscillating movement of the bell crank in each direction, the pivotal connection of .the link 172 with the bell crank crosses the line joining the pivot of the bell crankand the pivotal connection of the link 172 with the needle segment.

of the bell crank188 is connected by a link 190 with the actuating crank 169. With this connection between the awl and-its actuating crank it will be apparent that an idle backward and forward movement will be imparted to the awl at the limit of its retracting movement, this idle movement being rovided in order to maintain the awl out 0 engagement with the work the desired length of time and to cause the awl to operate in the proper timed relation to the needle. This'result is .due mainly to the relation of the bell crank 188-to the awl segment, the arrangement being such that during the oscillating movement of the bell crank in each direction,

the pivotal connection of the link 186 with the bell crank crosses the line joining the pivotal connection of the link with the needle segment and the pivot of the bell crank. During the work piercing stroke of the needle the needle guide is advanced into engagement with the: workan'd is held inthis position while the needle is at the limit of its work piercing stroke, in order to support the needle against any drag of the work support and presser foot on the workin returning to their initial position after feeding the work. ,The needle guide is advanced and held in advanced position by ymeans of the needle segment (Fig. 17), which is connected by a coiled spring 191 with the carrier for the needle guide. During the loop drawing strokeof the needle the needle guide is retractedby the engagement of the rear end of the needle segment with a lug 194 on the needle guide carrier.

c It is frequently desirable in sewing about the shank of a shoe to retract the edge gage and. fudge knife from the work and to lengthen the feed, and when the forepart of the shoe is reached tomove the edge gage and fudge knife into operative engagement with the shoeand to shorten the feed. These operations are simultaneously efiected in the illustrated machine by means of the hand operated lever 193 havingits rearend pivottally mounted on the shaft Stand having its forward [end extending to a position where it is conveniently accessible to the operator (Figs. 2, 5 and 10) The connection between the hand lever 193' and the edge gage, fudge knife, and work feeding means is such that upon movement of the leve'r downwardlyfrom the position shown in Fig. i

5, the edge'gage and fudge knife will be moved into operative engagement with the 1 work and the length of the feed decreased, and upon movement of the lever in the opposite direction the edge gage and fudge knife will be retracted from the work and the length of the feed increased.

The edge gage 6 is formed on the forward end of a lever pivotally mounted on a. cap

screw 196 between the head of the screw and the arm 164: The end of the cap screw 196 is reduced and extends through an aperture in the end of the arm 164 and is threaded into a block 198 on the inner side of the arm. The fudge knife 10 is adjustably secured to the arm 164 by being inserted in an aperture 200 formed by registering grooves in the 'arm and block 198 which are concentric with the axis of the arm. The rear end of the edge gage lever is pivotally connected to the upper arm of a bell crank 202 pivotally mounted on a stud shaft 204. On the lower arm of the bell crank 202 (Figs. 5, 10 and 16), a block 206 is pivotally mounted which engages acam groove in a segment 210 carried by the hand lever 193. The cam groove in the segment 210 is so arranged that upon movement of the hand lever 193 downwardly from the position shown in Fig. 5, the bell crank will be rocked in a direction to move the edge gage and fudge knife into operative engagement with the work, and upon movement of the hand lever upwardly, the edge gage and fudge knife will be retracted from the work.

In order that the length of the feed may be ad usted by the hand lever 193, the hand lever 62 for adjusting the length of the feed as hereinbefore described, is adapted to be connected to the hand lever 193. The lever 62 has a handle 211 pivotally connected with its out changing the'positions of the edge gage and fudge knife, by swinging the handle 211 outwardly to disconnect the hand levers 62 and 193, as shown by broken lines in Fig. 10,

. permitting the levers to be moved independently. v

The amount of movement imparted to the edge gage and fudge knife and the amount of adjustment of the feed during a movement of the hand lever 193 a given distance may be relatively varied by an adjustment of the segment 210. To this end the lower end of the segment is pivotally mounted on a down- 21 0 relatively to the shaft 64 may be varied and thereby the amount of movement imparted to the edge gage and fudge knife relatively to the amount of adjustment of the feed during a movement of the lever 193 may be varied. By adjusting the segment 210 so that its cam groove will be concentric with the shaft 64, it will be seen that no movement will be imparted to the edge gage and fudge knife upon moving the hand lever 193. Such adjustment of the segment 210 about its pivot is effected by means of a rod 216 having its rear end pivotally connected to the upper end of the segment 210. The rod 216 extends through the handle of the lever 193 and its forward end is threaded into a nut 218 on the end of the handle (Fig. 2). The nut 218 is held from longitudinal movement so that by turning the nut the desired adjustment of the segment 210 can be efiected.

The thread arm or hook 142 (Figs. 1, 6,10, 17 and 20) which cooperates with the looper 20 to lay the thread in the barb of the needle in the usual manner is actuated by a cam disk 44 carried by the driving shaft 46. The connection between the thread hook and the cam disk 44 comprises a pinion 220 engaging gear teeth formed on the collar or segment 162 that carries the thread hook. The pinion 220 is engaged by a gear segmentformed on the upper end of a lever 222 fulcrumed on a pin 224 secured to the machine frame. The lever is actuated by a cam roll 223 on the lower end thereof engaging a groove in the inner face of the cam disk 44.

The looper 20 comprises a tube through which the thread passes (Figs. 1, 6 and 11). Back and forth and transverse movements in a plane inclined slightly to the horizontal are imparted to the looper which combine to cause the looper to traverse a path about the needle. I The looper is secured in a collar upon the upper end of a carrier 230 pivotally mounted on a pin 232 extending between ears projecting from a block 234. The back and forth movement is imparted to the looper by means of a yoke 236 having horizontal hubs 238, one of which is pivoted on the inner end of the stud shaft 204 and the other pivoted on a pin 239 secured to the frame of the machine. The yoke'236 is provided with a slot 240 that is engaged by a downwardly projecting tail piece 242 on the carrier 230. The yoke 236 is provided with a downwardly extending arm 244 having a cam roll 246 on its lower end which engages a cam groove in a face of the cam disk 247 carried by the shaft 46. The transverse movements are imparted to the looper by means of the block 234 which is rocked about a horizontal axis,

The block is mounted on the frame of the machine by means of a rearwardly extending pin 248 formed on the block engaging an aperturein the frame. The slot 240 in the yoke 236 is elongated to permit the tail piece 242 on the looper carrier to work therein upon actuation of the block 234. The block 234 is actuated by means of a downwardly projecting arm 250 projecting therefrom which is provided with a cam roll 252 on its lower end engaging a cam groove in the cam disk 247. It will be noted that this mechanism for actuating the looper is simple and

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