US1351090A

US1351090A - Shoe-sewing machine

Info

Publication number: US1351090A
Application number: US231937A
Authority: US
Inventors: Ashworth Fred
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1918-05-01
Filing date: 1918-05-01
Publication date: 1920-08-31
Anticipated expiration: 1937-08-31

Description

F. ASHWORTH; SHOE SEWING MACHINE APPLICATION FILED MAY 1, 191a.

Patented Aug 31, 1920..

5 SHEETSSHEET I.

F.v ASYHWORTH. SHOE SEWING MACHINE APPLICATION FILED MAY 1, 19178,

Patented Aug. 31, 19%.

5 SHEETS-SHEET 2.

mlneus's F. ASHWORTH. SHOE SEWING MACHINE APPLICATION FILED MAY 1. 1018.

PatentedAug. 31,1928?" 5 SHEETSSHEET 3.

F. ASHWORTH.

SHOE SEWING MACHINE. APPLICATION FILED MAYI, 1918.

Patented Aug. 31, 1920..

5 SHEETS-SHEET 4.

Z3 E (9 i 69 F. ASHWORTH. SHOE SEWING MACHINE. APPLICATION FILED MAY 1, 191a Patented Aug 31, 19%.

5 SHEETS-SHEET 5- FRED ASHWOETH, 0F BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHIYEEY CORPORATION, 015 PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SHOE-SEWING 321T ACHINE.

Specification of Letters Patent.

Patented stu 31, 1920..

Application filed May 1, 1918. Serial No. 231,937.

To all whom it may concern Be it known that I. Finn) Asrrwon'rir, a citizen of the United States, residing at Beverly, in the county of Essex and State of ll fassachusetts, have invented certain new and useful Improvements in Shoe-Sewing Machines; and I 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 shoe sewing machines, and more particularly to outsole shoe sewing machines of the class employed in sewing the outsole to the welt of a welted shoe.

The objects of the invention are to provide shoe' sewing machines of the class above referred to with improved mechanism for bringing the machine to rest at a predetermined point in the cycle of operations after the sewing of the shoe, and with improved mechanism for unlocking or for unlocking and raising the presser foot as the machine comes to rest.

With these objects in view the invention consists in certain novel constructions, combinations and arrangements of parts hereinafter described and claimed, the advantages of which will be obvious to those skilled in the art from the following description.

The various features of the invention will be clearly understood from the following detailed description and accompanying draw ings, in which Figure 1 is a side elevation of an outsole shoe sewing machine embodying the preferred form of the present invention, looking from the right; Fig. 2 is a sectional side elevation of the machine looking from the left: Fig. 3 is a rear elevation of the stop mechanism and devices controlled thereby cooperating with the presser foot; Fig. 4 is a. detail front elevation of the stopping dog and its controlling devices, the parts being in such position that the dog is held in ineffective positionmFig. 5 is a fron'televation of the same mechanism. showing the parts in such position that the stopping dog is effective; Fig. 6 is a detail side elevation of the presser foot and mechanism for controlling its movements; Fig. 7 is a plan view of the devices shown in Fig. 6; Fig. 8 is a detail sectional elevation of the controlling devices of the stop mechanism; and Fig. 9 is a plan view of the stopping dog for positively stopping the machine.

The machine herein illustrated is of the same general type as that shown in the patent to French and Meyer No. 473,870, dated April 26, 1892. Such machine is provided with the usual stitch forming instrumentalities, a work support 2 and a presser foot 4.

The presser foot 4:, as usual, is secured to the forward end of a lever 6, pivoted on a stud 8 and having a rearwardly extending arm to which is connected a depending frame 10 which-is acted upon by a light spring 12 to hold the presser foot in engagement with the work. There is connected to the rear end of the presser foot lever a link 14 which extends through a recess in a laterally projecting lug 16 formed on a lever 18 also loosely pivoted on the stud 8. The link 14 is surrounded at its upper portion by a strong spring 20 between a collar 2% freely slidable on the link, and a nut 22 by means of which the tension of the spring 20 may be adjusted. In order to move the lever 18 to compress the spring 20, said lever is provided at its rear end with ratchet teeth 26, which are engaged at a certain period of the cycle of operations by a pawl 28 secured to the forward end of a lever 30. 30 is operated by one of the cams on the main cam shaft in the usual manner to lift the lever 18 by means of the pawl 28.

The presser foot is locked by a pawl 32 pivoted on a stud 34. and which is held in engagement with ratchet teeth 35 formed on the rear end of the presser foot lcvcr by means of a spring 36 which is secured by a screw 38 to the lever 30. While the prcsser foot lever is locked, the lever 19 is also held locked in position by means of the pawl 28 which remains in engagement with the ratchet teeth 26. the actuating lever 30, on which said pawl is mounted, being stationary at this time. Just before the feeding movement takes place, pawl 32 is released by means of the lever 30, which has a projection formed thereon to engage a iearwardly The lever extending tail 40 of the pawl. The lever 30 also moves pawl 28 into engagement with a stationary pin 41. thus releasing both pawls as fully described in the patent to French and l\Ieyer above referred to.

hand lever 42 is provided by means of which the operative may release the locking pawls when he desires. The hand lever 42 is pivoted on the stud 8 in a position to be conveniently grasped by the operative. The lever 42 has a downwardly and rearwardly projecting arm 44 pivotally connected to a yoke 46 which has

twoarms

48 and 50. The arm 48 of said yoke has a beveled end which is adapted to engage a pin 52 on the pawl 28 and the arm 50 of said yoke has a slot formed in its end and engaging a pin 54 on the pawl 32. hen the lever 42 is moved forwardly the yoke 46 is moved rearwardly by arm 44. and the ends of said yoke move the pins 52 and 54 so as to lift the locking pawls 28 and 32 out of engagement with their cooperating ratchet teeth. The prcsser foot is thenfree to be lifted from the work and to so lift the presser foot. there is provided a handle 56 secured to the presser foot level. which is adapted to be swung rear? \vardly by the operative to lift the presser foot off the work. The mechanism so far described is disclosed in the patent to French & Meyer above referred to or has been in common use for many years.

The machine illustrated in the drawings is provided with novel devices to move the locking pawls 28 and 32 to ineffective position and to lift the presser foot out of engagement with the work when the machine is stopped. These devices comprise an arm 58 pivoted on the stud 60 and having a cam 62 formed thereon which engages a roll 64 on a dependent arm 66 pivoted at 67 on the machine frame. The arm 58, when depressed, swings the dependent arm 66 rearwardly so that said arm 66 engages a laterally projecting lug 68 formed on the yoke 46 and by means of said lug moves the yoke rearwartflly to disengage the locking pawls 28 and 32 in the manner above described. As the arm 58 is moved downwardly still farther, a screw 69, secured in a laterally projecting portion of arm 58 is brought into engagement with the top of the frame 10 and moves the rear end of the presser foot lever downwardly to lift the presser foot off the work. During the normal operation of the machine, the arm 58 is held in its upper and ineffective position by means of a spring 70 connected to a pin 72 on said arm and a pin 74 secured in the split clamp 76 which is fixed to the stud 8. When the -mechanism for stopping the machine is thrown into operation, however, it operates in the manner to be hereinafter fully described to pull the arm 58 downwardly by means of a Bowden cable connection 78 so as to release the locking mechanism and lift the presser foot as above described. The connection 78 consists of a wire passing through a flexible but longitudinally immovable guiding sheath and is operated just before the stop mechanism brings the machine to rest.

The driving and stopping mechanism herein disclosed comprises a pulley 80 continuously rotated at high speed from a-suitable source of power. The pulley 80 is rotatably and-slidably mounted on the driving shaft and is moved to bring a friction clutch face 82 formed thereon into engagement with a cooperating friction clutch face 84 formed on a clutch member 86 secured to the driving shaft A. The clutch member 86 is a hand-wheel by means of which the operative may rotate the driving shaft by hand. The pulley 80 is moved into and out of engagement with the clutch face 84 by means of a yoke 88, the arms of which have pins 90 secured thereto which engage in a groove 92 formed in a hub 94 of the pulley 80. The yoke 88 is pivoted on a stud 96 mounted in a depending arm 97 secured to the machine frame. The yoke 88 has a laterally extending arm 98 and is rocked about the pivot 96 to engage and disengage the clutch faces 82 and 84 by means of said arm. A rod 100 passes through a recess in the end of the arm 98. This rod is surrounded by a compression spring 102 interposed between an adjustable nut 104 screwed on said rod and a lug 106 projecting laterally from an arm 108 pivotally mounted on the stud 96. The arm 108 has a recess 110 formed therein, through which passes the rod 112 extending upwardly from the controlling treadle of the stop mechanism and secured to said rod 112 are two collars 114, one on each side of the end of said arm 108. As the rod 112 is pulled downwardly one of the collars 114 engages the end of the arm 108 and rocks said arm about its pivot moving the lug 106 downwardly. As the lug 106 is thus moved it compresses the'spring 102 and pulls the rod 100 downwardly to rock. the yoke 88 about its pivot and move the pulley 80 to engage the clutch faces 82 and 84. When these clutch faces are engaged the machine is driven at high speed which varies with variations in pressure on the treadle bythe operative. When the treadle rod 112 rises on release of the treadle to throw the stop mechanism into operation, the lower collar 114 lifts the arm 108 and the lug 106 strikes the under side of arm 98, lifting said arm and rocking the yoke 88 to disengage the clutch faces 82 and 84-. The upward movement of the arm 108 is limited by an adjustable abutment screw 109 which engages the bracket 97.

The low speed driving mechanism is of the type disclosed in applicants prior Patllt mounted for rotation on the main shaft.

After the high speed driving, clutch is thrown out of operation, the worm wheel 122, which constitutes the 'low speed driving member, is clutched to the main shaft A so as to drive said shaft at low speed. To this end there is provided a sliding clutch member 124 splinedto the main shaft and adapted to engage a coiiperating clutch member 126 formed on the worm wheel 122. The clutch member 124 is moved into and out of engagement with the clutch member 126 by means of an elbow lever 128, which has on one of its arms a roll to engage a cam groove 129 formed in the sliding clutch member 124. The elbow lever 128 also has a recess 130 formed in the end of its other arm and which is adapted to be engaged by a pin or bolt 132 at a predetermined point in the cycle of operations after the treadle is released. The bolt 132 is carried in a projecting portion 134 of a slide 136 which extends through an adjustable sleeve 138 and is surrounded by a spring 140 interposed between a shoulder on the'slide 136 and the sleeve 138. The spring 140 normally holds the slide 136 in its rearmost position and the rearward movement of the slide is limited as desired by adjustable nuts 142 threaded on the slide. During the operation of the machine at high speed, the bolt 132 is held below the recess 130 and the elbow lever is vibrated idly on its pivot by means of the cam groove 129. When the stop mechanism is thrown into operation, however, the bolt is moved upwardly and engages in the recess 130 when said recess moves into register with the bolt. The spring 140 then tends to hold the elbow lever against movement. When the elbow lever and the slide 136 are thus locked together, the cam groove 129 acting on the roll coiiperating therewith will force the clutch member 124 into engagement with the clutch member 126. The

force with which the clutch members are held in engagement depends on the tension of the spring 140. As the cam continues to rotate and the pressure of the clutch memher 124 on the member 126 becomes greater than the tension of the spring 140, the spring will yield and the slide 136 will be moved forwardly by the elbow lever 128. The continued rotation of the cam will then reduce the pressure on the clutch member 126 and the slide 136 will be moved rearwardly and further rotation of the cam will disengage the clutch members 124 and 126.

The movement of the bolt 132 is controlled by mechanism operated by the starting and stopping treadle. This mechanism comprises a depending link 144, connected at its upper end to the bolt and pivotally connected at its lower end to an arm 146 pivoted on a rod 148. Integral with the arm 146 is an arm 150 having a roll 152 mounted on its rear end. Said roll is engaged by a cam 154 secured to an arm 156 pivoted on a stud 158 and connected at 160 to the upper end of the treadle rod 112. When the treadle rod 112 is depressed, the cam 154 is swung downwardly and because of its engagement with the roll 152 rocks the

arms

150 and 146 downwardly to pull the bolt 132 downwardlv and out of engagement with the recess 130. When the treadle rod is released a spring 162 which surrounds the bolt 132 operates to raise the bolt 132 and when the recess 130 registers with said bolt 132 the bolt is moved by said spring into engagement with the recess to operate the stop mechanism as above described.

As previously stated, the slide 136 is given a forward and rearward movement just before the machine is stopped and this movement is utilized according to the present invention, to operate the lever 58 to release the locking mechanism of the presser foot and to lift the presser foot out of engagement with the work. The mechanism by which the slide 136 operates the lever 58 comprises an arm or lever 164 secured to a stud 166 which is rotatable in a bearing on the projecting portion 134 of said slide. Connected to one end of said arm 164 is one end of the Bowden cable connection 78. During the operation of the machine, the arm 164 is held in lowered position as illus trated in Fig. 8, by means of a tension spring 170 connected to a pin on said arm and a stationary arm 172, and when in such position the cable 78 is slack and the spring 7 O is free to lift the arm 58 to its inefiective position. When the slide 136 is given its forward and rearward movement the arm 164 is raised. When so raised, it will pull upwardly on the end of the cable 78 attached thereto, drawing the other end of said cable downwardly and moving the arm 58 downwardly. The devices for operating the arm 164 comprise a sleeve 174, integral with the left end of the stud 166 in which sleeve is received a spring-pressed plunger 176 which is normally pressed downwardly by a spring 178 until the enlarged head 180 of the plunger engages the upper end of the sleeve. The lower end of said plunger forms one member of a latching device and coiiperating therewith is a latch member 182 secured by a bolt 184 to the arm 156. When the arm 156 is moved upwardly on release of the treadle the latch member 182 will occupy a position to the right of the lower end of said plunger 176, as viewed in Fig. 8, and when the slide 136 is subsequently moved forwardly the plunger 176 will be moved to the rightof said latch member 182. The

plunger or latch member 176 is provided with a cam face 186 which engages a cooperating cam face188 formed on the latch member 182 as the slide 186 moves forwardly. The cam face 188 raises the plunger 176 against the tension of the spring 178 and enables the plungerto be moved forwardly beyond the latch member 182. When moved to such position the spring 178 depresses the plunger to its normal position. The

latch members

176 and 182 are provided also with abrupt'faces 190 and 191 which are engaged as the slide 136 is moved rearwardly and during the continued rearward movement of the slide the stud 166 is rocked in its bearing and the arm 164 is raised.

It is desirable to stop this machine accurately and without objectionable shock or jar at a definite point in the cycle of operations in which the parts of the machine are in such relative position as not to interfere with the removal of the; work. To secure this result a stop dog 192 is provided, which. is adapted to engage a notch 194 formed in the peripheral surface of a cam disk 196 secured to the main shaft A. The stop dog 192 projects laterally through a slot formed in a carrier arm 200 which is pivoted on a stud 202 and is rocked about said stud in a manner'hereinafter described to bring the dog into engagement with the notch 194.

The dog consists of a projection-from the rear end of a rod 204, slidably mounted in the carrier arm 200. This rod is surrounded by a compression spring 206 which is interposed between an enlarged head 208 on the rod 204 and ashoulder 210 of the carrier arm. The spring normally holds the rod 204 in its rearmost position. ."When the dog 192 engagesin the notch 194 it is moved forwardly by the momentum of the machine andwhen so moved it moves said rod 204 to the right as viewed in Figs. 2 and 8 until the resistance of the spring 206 overcomes the momentum and brings the machine to a stop. The force of the s ring then moves the stop 192 to the left and reversely rotates the drive shaft of the machine until the force of the spring is reduced to such a point that it is 'insuflicient to move the drive shaft, when the machine will be brought to rest.

To control the movements of the carrier arm 200, said arm has formed thereon a downwardly extending arm 212 having a pin 214 secured therein whichengages in a slot 216 in the lower end of a link 218, connected at its upper end to the link 144, connected to the lock bolt 132. Connected also to the pin 214 is a tension spring 220, which is also connected to an arm 222 fast on shaft 148. The spring 220 normally tends to rock the rear end of the carrier arm upwardly to move the dog 192 into engagement with its cooperating notch, but w en the treadle is depressed to start the machine into operation the link 144 is pulled downwardly and by means of link 218 rocks the rear end of the carrier arm downwardly, moving thev dog 192 below the periphery of the cam disk 196. During the operation of the machine, the treadle holds the dog in this position. When the treadle is released the link 144 is raised by the spring 162 and as the link 218 is drawn upwardly, the spring 220 is permitted to draw the rear end of the carrier arm upwardly. The disk 196 is so constructed that a part of itsperipheral surface is wider than the remainder of said peripheral surface, such wide surface extending abouthalf way around the disk. The notch 194 is formed in this wide part of the peripheral surface of the disk, and if the carrier arm 200 is swung upwardly at a time when the wide surface is in a position to be engaged by the stop dog 192, said dog is prevented from moving into engagement with the surface and is, therefore, held out of engagement with the notch 194. The stop dog is controlled in thismanner by a yielding controlling dog 226 formed on the rear stop dog 192 and when said dog 226 engages the, surface of the disk the dog 192 is held. in a position a little below the surface of said disk. When the narrow surface of the.

disk comes opposite the dog 226, the dog will move upwardly to a position above the peripheral surface of said disk and the dog 192 will rest against said surface. As the disk continues to rotate a cam 236 011 said disk moves the dog against the tension of the spring 234 to the position shown in Fig. 5, and when the notch 194 reaches a point opposite the dog 192 said dog is moved into the notch by the action of the spring 220 and the machine is brought to a final stop as above described.

The nature and scope of the present invention having been indicatedand its preferred embodiment having been specificalh described, what is claimed as new is: i 1. A sole sewing machine having, in combination, stitch. forming devices, a work support, a presser foot, a cam shaft, driving mechanism therefor, a stop disk driven by the cam shaft provided with stop shoulder,

rennet a stop dog movable toward and from said disk and normally out of operation while the machine is running, a controlling dog movable with said stop dog and also movable independently at right angles to the movement of the stop dog, a surface on said disk cooperating with the controlling dog to hold the stop dog out of the path of said shoulder, a cam on said disk to move the controlling dog with relation to the stop dog out of the path of said surface, means for throwing the stop dog into operation and the driving mechanism out of operation to stop the machine and normally inoperative mechanism thrown into operation on stopping the machine for lifting the presser foot before said stop dog engages said stop shoulder.

2. A sole sewing machine having, in combination, stitch forming devices, a work support, a presser foot, a cam shaft, driving mechanism therefor, a stop disk driven by the cam shaft provided with a stop shoulder, a stop dog carrier movable toward and from said disk and normally out of operation while the machine is running, a stop dog yleldlngly mounted in said carrier, a controlllng dog mounted on said carrler so as to move independently at right angles to the movement of the carrier, a surface on said disk cooperating with the controlling dog to hold the stop dog carrier in a positlon in which the stop dog is out of the path of said shoulder, a cam on said disk to move the controlling dog with relation to the carrier out of the path of said surface, means for throwing the stop dog carrier into operation and the driving mechanism out of operation to stop the machine, and normally inoperative 'mechanism thrown into operation on stopping the machine for lifting the presser foot before said stop dog engages said stop shoulder.

3. Asole sewing machine having, in combination, stitch forming devices, a work support, a presser foot, a cam shaft, driving mechanism therefor, a stop disk driven by the cam shaft provided with a peripheral slot, a stop dog movable radially of said disk toward .and from said disk and normally out of operation while the machine is running, a controlling dog movable radially of the disk with said stop dog and also movable axially of the disk independently of said stop dog, a laterally extended surface on the periphery of the disk cooperating with the controlling dog to hold the stop dog out of engagement with saidlslot, a cam on the edge of the periphery of said diskto move the controlling dog with relation to the stop dog out of the path of said surface, means for throwing the stop dog into operation and the driving mechanism out of operation to stop the machine, and normally inoperative mechanism thrown into operastitch forming cycle, a pawl lifter normally inoperative, a lever, and suitable connections for moving the pawl lifter to unlock the presser foot, a stop mechanism acting to stop the machine at a point the stitch cycle where the pawl normally, engages the ratchet, mechanism thro vn into operation on stopping the machine,- or actuating said lever, said mechanism including a wire conne'cted to said lever and a flexible longitudinally immovable guiding sheath for said wire. I

5. A sole sewing machine having, in combination, stitch forming devices, a work support, a presser foot lever, a presser foot on one end of said lever, a ratchet on the other end. of said lever, a cooperating locking pawl, means for moving the pawl into and out of engagement with said ratchet during each stitch forming cycle, a pressure lever yieldingly connected to the presser foot lever, a ratchet on said pressure lever, mechanism including a pawl engaging said ratchet for actuating said pressure lever to force the presser foot toward the work support, a pawl lifter normally inoperative, a stop mechanism acting to stop the machine at a point in the stitch cycle where the pawls normally engage their ratchets, and mechanism thrown into operation on stopping the machine for moving the pawl lifter to lift the pawls from their ratchets, said mechanism including a lever and suitable connections between the lever and the pawl lifter, a wire connected to the lever and a flexible longitudinally immovable guiding sheath for said wire.

' 6. A sole sewing machine having, in com bination, stitch forming devices, a work support, a presser foot, mechanism for forcing the presser foot toward the work support .to clamp the material, a ratchet connected to the presser foot,a locking pawl engaging the ratchet, means for moving the pawl out of engagement with the ratchet during each stitch forming cycle, a pawl lifter normally inoperative, manually operable means for actuating said pawl lifter, a release lever engaging the pawl lifter, an actuating lever engaging the release lever, a stop mechanism acting to stop the machine at a point in the stitch cycie where the pawl normally engages the ratchet, and means thrown into operation on stopping the maltd chine for moving the actuating lever to unlock the presser foot.

7. A sole sewing machine having, in combination, stitch forming devices, a work support, a presser foot lever, a presser foot on tive, manually operable means for actuating said pawl lifter, a release lever engaging the pawl lifter, an actuating lever en'- gaging the release lever and arranged dur ing its movement to engage the ratchet end of the presser foot lever, a stop mechanism acting to stop the machine at a point in the stitch cycle Where the pawl normally engages the ratchet, and means thrown into operation on stopping the machine for moving the actuating lever to unlock and lift the presser foot.

8. A sole sewing machine having, in combination, stitchforming devices, a work support, a presser foot, a cam shaft, high and 'low speed driving mechanism therefor,

means for throwing the lOW speed mechanism into and out of operation in stopping the machine including a cam, a lever oscillated thereby, a spring pressed slide, a coupling device for connecting the lever and slide, and mechanism actuated by the slide for raising the presser foot.

9. A sole sewing machine having, in combination, stitch forming devices, a work support, a presser foot, a cam shaft, high and low speed driving mechanism therefor, means for throwing the low speed mechanism into and out of operation in stopping the machine including a cam, a lever oscillated thereby, a spring pressed slide having a movement in one direction as the low speed mechanism is thrown in and a return move ment as the low speed mechanism is thrown out, a coupling device for connecting the lever and slide, and mechanism actuated by the return movement of the slide for raising the presser foot.

10. A sole sewing machine having, in combination, stitch forming devices, a work support, a presser foot, a cam shaft, high and low speed driving mechanism therefor, means for throwing the low speed mechanism into and out of operation in stopping the machine including a cam, a lever oscillated thereby, a spring pressed slide having a movement in one direction as the low speed mechanism is thrown in and a return movement as the low speed mechanism is thrown out, a coupling device for connecting the lever and slide, a lever mounted upon said slide, latch devices for causing said lever to be actuated by the return movement of the slide, and connections actuated by said lever for raising the presser foot.

11. A sole sewing machine having, in combination, stitch forming devices, a work support, a presser foot, means for forcing the presser foot toward the Work support to clamp the material, a ratchet connected to the presser foot, a locking pawl engaging the ratchet, means for moving the pawl out of engagement with the ratchet during each stitch forming cycle, a cam shaft, high and low speed driving mechanism therefor, means for throwing the'lo'w speed mechanism into and out of operation in stopping the machine including a cam, a lever oscillated thereby, a spring pressed slide, a coupling device for connecting the lever and slide, a lever mounted on the slide and actuated by the movement thereof, an actuating lever and suitable connections for moving the locking pawl to unlock the presser foot, and a wire connecting said actuating lever and the lever on said slide.

FRED ASHWORTH.