US2046070A

US2046070A - Sewing machine

Info

Publication number: US2046070A
Application number: US8863A
Authority: US
Inventors: Otto R Haas
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1932-03-19
Filing date: 1935-03-01
Publication date: 1936-06-30
Anticipated expiration: 1953-06-30

Description

5 sheets-sheet l Original Filed March 19, 1932 I Mmmm 41M @5% Mw@ @f WM@ O. R MAAS SEWING MACHINE Original Filed March 19, 1932 5 Sheets-Sheet 2 www o. R. MAAS yE@ i936.,

SEWING MACHINE Original Filed March 19, 1932 5 Sheets-Sheet 3 liv/vena? g1 (QM/@ K Vil/@ess y o. R. MAAS Zi-@m SEWING MACHINE v Original Filed March 19, 1932 5 Sheets-Sheet 4 zwi-6m@ G. R HAAS SEWING MACHINE im w3@ Original Filed March 19, 1932 5 Sheets-Sheet 5 Hmmm www@ i /r Patented June 30, 1936 unirsi) STATES PATENT OFFICE SEWING MACHINE Original application March 19, 1932, Serial No.

12 Claims.

The present invention relates to shoe machines and is herein set forth as embodied in an outsole stitcher of the type in which the shoe and the stitch forming devices are moved relatively 5 to transfer the point of operation about the shoe and to change the relative positions of the shoe and the operating means to present the shoe properly to the operating means as the point of operation is transferred about the shoe, and in l which the shoe is supported in operating position in the machine and all' of its movements are eected and controlled by automatically acting mechanisms. A machine of this type is disclosed in applicants prior application Serial No.

l 609,0i5, for Shoe sewing machines, filed March 19, 1932 of which the present application is a division.

The primary object of the present invention is to improve the construction and mode of oper- 2@ation of outsole shoe sewing machines and to produce a machine of the automatic type above referred to which is more eicient, reliable and uniform in its operation than prior machines, and upon which an operation on a shoe may be successfully performed by a comparatively unskilled operator with a minimum expenditure of labor and time. Certain features of the invention may be utilized to advantage in connection with shoe sewing machines other than outsole stitchers or in connection with machines for performing other shoe making operations. Also, certain features are not limited to use in machines which are wholly automatic in character, but may be embodied in machines in which at least some of the required relative movements of the operating instrumentalities and shoe are produced or controlled by the operator.

The automatic machine hereinafter described is of that type which comprises a jack upon which the shoe to be operated upon is supported and to which positioning movements are imparted to cause the shoe to be presented properly to the operating means as the point of oper- 45 ation is transferred about the shoe.

One feature of the present invention embodied in the machine hereinafter described comprises an improved means for stopping the machine in case of a misstitch caused by slack or broken 50 thread. In the present form of this feature of the invention, the machine, having a thread cutter and mechanism for throwing the jack out of operative position as the seam is completed on a shoe, is arranged with electrically controlled 55 devices to prevent actuation of the thread cutter Divided and this application March 1, 1935, Serial No. 8,863

and throwing out of the jack when the machine is stopped by reason of a misstitch.

The circuits of the electrically controlled devices according to the illustrated embodiment of the invention, are rendered inoperative to stop 5 the machine just before the seam is completed and for the first few stitches on a new shoe so that slack thread due to causes incident to stopping or starting will not effect the proper operation of the machine. 1n

The features of invention above referred to and other novel constructions, combinations and arrangements of parts hereinafter described and claimed will be readily understood by those skilled in the art from the following description taken in connection with the accompanying drawings which illustrate an automatic outsole stitcher constituting one speciiic embodiment of the several features of the invention.

In the drawings Figure l is a view in front elevation of a complete automatic outsole stitcher embodying the several features of the invention with the lower portion of the main base, the motor, and certain other parts broken off; Figure 2 is a plan view of the machine with the 25 frames for the power drive and sewing mechanism removed, and with the base partly broken away to show the construction and mechanism within the base; Figure 3 is a view in elevation of the upper portion of the machine from the right side, partly in section, illustrating particularly the driving and stopping mechanism; Figure 4 illustrates diagrammatically a wiring system for electrically connecting various parts of the machine; Figure 5 is a view on an enlarged 35 scale of a portion of the sewing mechanism in the machine; and Figure 6 is a detail View showing, in side elevation and section, certain of the parts connected with the driving and stopping mechanism.

Referring to Figures l and 2 of the drawings, the frame of the machine comprises a main base 2 having a horizontal top 4. Suspended through an opening in the top is a cradle 6, machined to carry the frames 8 and I0 for the power drive 45 and the sewing mechanism, respectively. The power drive frame 8 supports a driving motor l2 attached to a flange at the top of the machine.

The motor i2 is mounted to drive a vertical shaft I4 (see Figs. 3 and 6) for operating the 50 constantly rotating main power driver, indicated at l5. The power driver I6 is formed at its lower portion with a conical clutching surface I8 for engaging a correspondingly shaped internal clutching surface 20 on a driven clutch 55 member 22. VThe clutch member 22 extends upwardly from a sleeve 23 freely slidable and rotatable on a shaft 24 and provided with an inheavy compression spring 25 between the sleevey 23 and a bearing carried by the power drive frame. member is also conical in shape and is adapted to engage an annular brakingvmember 2'| attached to the frame of the machine.

To disengage the driven clutch member from the main driver at the proper time and wedge it within the braking member 2'| to arrest thel movement of a sewing cam shaft 28 and a pattern cam shaft 29 driven thereby, means substantially the same as in the driving and stopping mechanism described in the T T.V S. Patent to Topham No. 1,791,176 granted February 3, 1931 are provided, comprising a suitably shaped Vcam slot 3|] formed on the sleeve 23 fork engagement with a spring pressed Ylock bolt 3|. vThe look bolt is mounted in aY carrier 32 rigidly secured to a horizontal rock shaft 34 mounted in the frame. Y

While the machine is in operation and while the sewing and pattern cam shafts are being driven, the lock bolt 30 is out of engagement with the'cam slot'30 and the clutch member' 22 is held in engagement with the power driver I6 by the force exerted'by the spring 26 kon the sleeve 23. To disengage the driven clutch member from Vthe power driver, the look bolt is allowed to engage the cam slot 30' in the sleeve 23Y and at a certain point in the revolution of the sleeve the carrier for the bolt is heldagainst movement, thereby causing the lock bolt and cam groove to cooperate in forcing the clutch member 22 away from the power driver against the force of the spring 26, and bringing the brake surface on the driven clutch member into engagement with the fixed braking member 21.

VThe horizontal arm of the carrier in which the bolt is mounted is maintained in` raised position by a spring 35 stretched between the vertical arm of; the carrier and the frame of the machine.vv When the locking bolt is allowed to move toward the cam slot, it engages the outer surface of the sleevel 23 and slides into the slot when the slotregisters with the bolt. Continued rotation of the clutch member causes the lock fbolt to be moved downwardly and the lock bolt carrier tobe moved in a clockwise direction. Movementof the lock bolt in the opposite direction is then prevented by the engagement of the vertical arm of the lock bolt carrier by a spring pressed latch 36. The lock bolt carrier with the'lock bolt 3| is thus held against movementand the continued rotation of the sleeve 23 causes the separation of 'the clutch members.

To start the machine in operation a power operated starting mechanismfis provided comprising'a horizontal crank shaft 38 and an auxiliary one-revolution clutch 43 on the shaft. The one-revolution clutch Vis ordinarily held in uncoupled condition by an abutment 42 (see Fig. 6)1carried on va rod 44 pivoted to the machine frame. To enable the crankV shaft to be operated, `the one-revolution clutch is coupled by rocking-the abutment 42 outof contact with Vthe clutch. The abutment 42 is rocked by means of amanually operated handle Mrpivoted on the The outside surface of the driven clutch,`

frame. Rotation of the crank shaft actuates the lock bolt 3| and the carrier latch 36 to free the main driven clutch member 22 from engagement with the stationary brake and allow it to rise under the pressure of the compression spring, into driving Vrelation with the lower driver I6, the crank shaft 38 4carrying a pitman 48 with a vertically adjustable stop screw 5,0. The latch 36 is released from the lock bolt carrier and the lock bolt 3| is withdrawn from engagement with the cam slot 30 by the action of the stop screw 50 on a projecting screw 54 carried byk a link 56 through connections substantiallyV the same as disclosed in Patent'No.

The mechanism for automatically initiating the nal stopping movements of the machine is actuated from the pattern cam shaft 29 after it has nearly completed a revolution. This mechanism acts to release the lock bolt 3| and permit the gear, which block, after the pattern cam'` shaft has made nearly a complete revolution, engages and swings backwardly a pawl lever 60,

and through the pawl moves a lever 62 pivotally mounted at 64 on the machine frame. A sliding rod 66 is pivotally connected at its rear end to the lever 62 and at its forward end is arranged to engage the end of a dog 68 pivotally mounted at the left hand end of a lever l0.V The arrangement of these partsV is such that as the pattern-cam shaft nears the end of a revolution the lever 62 is rocked, the rod 66 is moved longitudinally towards the front of the machine, and the lever '|0 is swungv forwardly at its left hand end about its pivot '|2. The right hand end of the lever 10 is connected by means of a slotted link '|4'to the left hand end of another short centrally fulcrumed lever 16. The'right hand end of the short lever is provided with a V- shaped recess in which the lower wedge shaped end of a vertical sliding control bar rests (see Figs. 1 and 2) When the left hand end of lever 12 is moved forwardly, the right hand end of the short lever 'I6 is actuated to raise the vertically sliding control bar 11. When the control bar is givenY an upward movement, the lock bolt 3| is permitted to engagethe cam slot 30 on the main driven clutch member. 'Ihe entry of the lock bolt 3| within the ycam slot 30 causes the driven clutch member to becomedisengaged from the main driver and wedge within the braking member 2'| to arrest themovement of the main sewing cam shaft.

The jack '|8 and its supporting structure are substantially the same as in the machine ofV Patent No. 1,834,471, more fully described in U. S. Patent to Laurence E. Topham and Alfred R. Morrill No. 1,616,714, dated February 8, 1927 and inapplicants co-pending application, above referred to. During the sewing operation, tipping and rotating movements are imparted to the shoe to maintain the shoe at all times in proper position, tipping movements being imparted by moving the lower end of the jack forwardly and rearwardly of the machine, and laterally, and rotating movements being imparted by rotating the jack about the axis of the jack. In the present machine, the shoe is fed by the-.devices end lof the arm by insulating material.

, Contact I I4.

of the sewing mechanism acting directly on the shoe.

When the sewing mechanism is brought to rest at the end of a seam by disconnecting the main driven clutch member 22 from the main driver, an auxiliary mechanism similar to that of the machines of Patents No. 1,616,714 and No. 1,834,471 is automatically connected to the main driver |6 in substantially the manner disclosed in said patents. This mechanism comprises an eccentric 'I9 (see Fig. 6) mounted to turn loosely upon a hollow stud formed on the machine frame below the motor shaft |4. vertically below the eccentric i9 is a clutch block 80 arranged to drive the eccentric whenever the lever 'l0 is swung forwardly by the connections to the cam shaft in actuating the vertical sliding control bar 'I'I to stop the machine. I'his auxiliary mechanism actuated by the eccentric 'I9 includes an eccentric strap 02 by which the jack is moved outwardly away from the sewing devices, and also the mechanism through which a movement is imparted to the pattern cam shaft to complete its rotation so as to cause the jack to be reversely rotated to its initial position. Other operations performed during the final stopping movements of the machine include actuating a thread cutter S4 (see Fig. 3) to sever the threads of the last completed stitch and releasing the grip on the projecting edge of the shoe sole of the work support and the presser-foot. The thread cutter for severing the threads is operated from a continuously driven mechanism and includes a momentarily actuated one-revolution clutch 86. The same clutch also operates mechanism for releasing the presser-foot from engagement with the shoe sole.

The stitch-forming devices (see Figs. 3, 4 and 5) include the curved hook needle, indicated at 88, the awl at 90, the work support at 92, the presserioot at 94, the shuttle at 96, the looper at 93, the main take-up at |00, the auxiliary take-up at |02, the thread tension wheel at |04 and other mechanisms. In order to insure that the needle thread will not be pulled from contact with a new shoe as the first stitch is being formed, means is also provided for rotating the tension wheel |04 to withdraw a length of thread from the supply prior to the formation of the initial stitch when the machine is started, as described more fully in applicants copending application.

VV.The means for stopping the machine in case of a misstitch, according to the present' invention, (see Figs. 4 and 5) is actuated by the'relative positions of the main and auxiliary take-up members |00 and |02, and comprise contact members |06 fixed in insulating material carried by a fulcrum shaft |08 on which the main take-up member |00 is operated. The auxiliary take-up member |02 is carried on the shaft |08 which passes loosely through a hub portion ||0 of the auxiliary take-up member. Also, extending from the hub ||0 is an arm ||2 carrying a double ended spring contact ||4 separated from the The two contact members |06 are provided with arcuate surfaces for forming! a rubbing contact with spring supported brushes H6 insulated from the frame of the machine and connected to wires ||8 and |20, respectively. The contact members |06 are fashioned with radial shoulders |22 to which are attached contact points |24 of suitable refractory metal to cooperate with corresponding points on the two ends of the spring Movements of the contact ||4 and the contact members |06 together complete the connections from wire IIB, through the corresponding brush ||6, the contact member |06, the spring contact |4, the other member |06 and back through the wire |20 by the corresponding brush 6. The completion of the circuit through these connections actuates electrical apparatus hereinafter described to stop the machine without actuating the thread cutter or throwing the jack out of operative position in the machine and thus indicates slack thread due to breakage or other cause.

The main take-up member is operated from the main sewing cam shaft by oscillation of fulcrum shaft |03 which shaft has suitable bearings in the sewing machine frame. The auxiliary take up member |02 is operated in one direction by a spring |28, stretched between a right angle arm |30 extending from the hub of the auxiliary take-up member and the frame of the machine. A stop is provided for the auxiliary take-up member in the form of an adjustable abutment screw |32 threaded into the sewing frame for preventing extreme movement of the auxiliary take-up member during the operation of the machine. The abutment screw is so adjusted that with the auxiliarytake-up released to its extreme position under the action of spring |28, the contact members |06 operated by the main take-up will just contact with the double ended spring contact ||4 operated by the auxiliary take-up at the extreme position occupied by the main take-up. The auxiliary take-up may strike the abutment screw |32 at any other point during the stitchforming cycle of operations without completing the circuit through the contacts. At the time when each stitch is set the thread extends in a substantially straight line between a stationary pulley (not shown) and a pulley |34 rotating loosely on the fulcrum shaft |08, with the auxiliary take-up resting on this straight portion of thread. The thread is subject to the greatest tension at this time and the auxiliary take-up member is also in its most forward position. If breakage or slack thread from other cause occurs at this time, the circuit between the contacts will be closed and the machine brought to rest.

The electrical apparatus connected with contacts |06 for stopping the machine upon the 0ccurrence of a misstitch is illustrated 4diagrammatically in Figure 4. The wires ||8 and |20 connected to the brushes I I6 are connected to one terminal of the low Voltage winding of a transformer |36 and to a relay |30. The relay |38 is connected by a wire |40 to a stationary contact |42 positioned to be acted upon by a movable contact |44. The movable contact is connected to the other terminal of the low voltage winding of the transformer |35 by a wire |46. When the circuit is closed through contacts |42 and |44 and through the contacts |06 and III-l, the relay |38 is energized, closing relay contacts |48 having a connection |50 to one side of a source of power |52. A connection |54 from the other side of the source of power |52 completes the circuit through a solenoid |55. rlhus, when the coil circuit of the relay |38 is completed, the solenoid |55 will be energized to retract its armature |50. The solenoid |56 is bolted at it!) to the righthand edge of the base of the machine, adjacent the V-notched end of the short lever 'i6 for actuating the control bar 'IB (see Figs. 1, 2 and 4), to bring the machine to rest. The armature 58 of the solenoid |56 is pivotally connected to a hooked member |62.

The forward end of the only when the pattern cam shaft has nearly 41 Y Y Y 2,046,070

hooked member is provided with a notch to oooperate with a detent |64'xed to a shaft |65 which isjournalled a bracket |58 extending Y from the base of the machine and attached to Vslotted end of the link slides idly without actuating the lever 'lll to cause the operation of the auxiliary clutch block 88,*a's previously described. Since no movement of these levers is produce the auxiliary clutch for completing the movement of the jack and pattern cam shaft is not thrown into operation and the jack remains in operative.V position with the sewing mechanism, when the machine is stopped by energizing the solenoid |55. As the armature |58 is retracted, a positioning pinV H2 fixed in the bracket |58 and sliding inV an oblique Vslot |l4 in the hooked member |52 acts to throw the free end of the hooked member away from the end of the detent ifli to permit the lever l5 to return to its original position. When the solenoid is deenergized, a

Yspring (not shown) presses the armature |58 out of the coil and a spring |16 causes the hook memy ber |62 to snap in front of the detent |64 ready Y for another operation.

Y The thread cutter 84 is arranged to be actuated only at lthe end ofthe outseam, at whichr time the sewing mechanism has reached the breast line of the heel and the pattern cam shaft hasrsubsta'ntially completed its rotation. To secure this result, the-lever 62 operated by the block 58 on the pattern cam shaft is provided at its left hand en-d with a pivotal connection to a link H8 pivotally connected at its forward end to a lever (not shown) for controlling the thread cutter. The thread cutter clutch may,by this connection, be coupled to cut the thread and release the shoe from the stitch-forming devices reached its stopping position.

VMeans is also provided for preventing the operation of the thread break solenoid 55 upon the occurrence of slack thread during the first few stitches on a new shoe and during the iinal move#- Y ments of the machine. To this end the block 58 Y on the pattern cam shaft for operating the stop a spring i9@ connecting Vlugs on the two levers Y and yieldingly holding aY setscrew |98 mounted in a lug on the lever 84 in Contact with a lug on lever i923.

in which the contact |44 engages the contact |42, insulated from the bracket |98 by a spring 288 stretched between the lever |84 and the frame of the machine. The wiresY |45 and |45 are connected, respectively, to the contacts |42 and E44 and lead through an armored cable or other suitable conduit to a box 292 in which the various circuit connections are made. During the nal 'The connection between the link .Y

The lever |92 carries the insulatedY 4contact M14 and is normally held in a position movements of thev pattern cam shaft, the lever |88 is moved rearwardly by the block 58, breaking the circuit to the relay` |38 by separating the contacts |52 and |44; Should Va thread break occur at this time and the contacts |06 and |.|4 be moved together therelay .|38 will not be energized nor the armature |58 `be retracted.V The contacts |42 and |44 are cause-d to remain separated Vduring the first few stitches on a new shoe by positioning the end of the lever |80 sov that it will not be relieved fromthe block 58 immediately upon starting themachine. If the contacts E88 and H4 should come together during the nrst few initial stitches, an account of slack thread produced by rotation of the tension wheel,

the machine will not be stopped because the controlling circuit of solenoid |56 is maintained open by contacts |42 and 544.

The nature and scope of the present invention having been indicated and a machine embodying the several features having been specically described, what is claimed isr- Y 1. A sewing machine having, in combination, stitch-forming' devices `including an oscillatory main thread take-up, an auxiliary take-uma member movable with said auxiliary take-up, a member movable with said main take-up ar-V ranged to contact with the member movable with the auxiliary take-up at one limit of movement in the travel of said main take-up, and means for stopping the machinerrendered operative by the contacting of said members by reason of slack thread.

2. A sewing machine having, in combination..

stitch forming devices includingv an oscillatory` main thread take-up, an auxiliary'take-up yielding means for forcing said take-ups together,V an abutment for preventing contact of said take-ups except in extreme position of' said main take-up, and means for stopping the machine comprising electrical contacts movable with said take-ups to complete a circuit as said take-ups are forced together by reason of slack thread under the action of said yielding means.V n

4. A sewing machine having, in combination,

stitch-forming devices including an oscillatoryY main thread take=up,an auxiliary takeup,elec trical contactsr arranged to be engaged by the joint movement of said take-ups, yielding means for moving said take-ups to engage the contacts upon a misstitch, an electric circuit including an electro-magnet controlled by said contacts, apparatus for stopping the machine controlled by said iectro-magnet and a switch connected said circuit for rendering said contacts ineffective for operating said apparatus during a predetermined initial` movement of said Astitch-forming devices.

5. A shoe machine having, in combination,

means for operating upon a shoe, a shoe supporting jack, mechanism for changing the relative positions of the shoe and the operating means to present the shoe properly to the operating means as the point of operation is transferred along the shoe, an electric circuit including an electromagnet controlled by said loperating means, ap-

paratus for stoppingithe machine connected to said electro-magnet, and contacts associated with said position changing mechanism to render said circuit ineffective for operating said electro-magnet during a predetermined initial movement of said jack.

6. Ashoe sewingmachine having, in combination, stitch-forming devices comprising a main thread take-up and an auxiliary take-up, electrical contacts operable to affect a circuit by joint movement of said take-ups to an extreme position in the travel of each, an electro-magnet contained within the circuit including said contacts, apparatus for stopping the machine connected to said electro-magnet, a shoe supporting jack, mechanism for changing the relative positions of the shoe and the stitch-forming devices to present the shoe properly to the stitch-forming devices as the point of operation is transferred along the shoe, and contacts associated with said jack position changing mechanism to render said circuit ineffective for operating said electro-magnet during a certain portion of the travel of the jack.

7. A sewing machine having, in combination, stitch-forming devices, a main thread take-up for setting the stitch, an auxiliary thread take-up to maintain tension on the thread and contacts engageable upon release of said auxiliary take-up through thread breakage or the like, to close a circuit by the joint action of said take-ups while said main take-up is in stitch-setting position.

8. A sewing machine having, in combination, stitch-forming devices, a main thread take-up for setting the stitch, an auxiliary thread take-up to maintain tension on the thread, contacts engageable upon release of said auxiliary take-up through thread breakage or the like to close a circuit by the joint action of the take-ups while the main take-up is in stitch-setting position, and means for preventing engagement of the contacts when the main take-up is in any other than stitch-setting position.

9. A sewing machine having, in combination, stitch-forming devices, a main thread take-up for setting the stitch, an auxiliary thread take-up to maintain tension on the thread, contacts engageable upon release of said auxiliary take-up through thread breakage or the like to close a circuit by the joint action of the take-ups while the main take-up is in stitch-setting position, and a stop arranged t0 hold the auxiliary take-up in a position Where the contacts Will be out of engagement when the main take-up is in any other than stitch setting position.

10. A shoe machine having, in combination, means for performing a principal operation on a shoe, a shoe supporting jack, a pattern cam shaft, mechanisms actuated by the cam shaft for changing the positions of the shoe and the operating means to present the shoe properly to the operating means as the point of operation is transferred along the shoe, mechanism for causing the machine to perform certain auxiliary operations after the principal operation is completed, a driving and stopping mechanism for the machine, a control lever for the driving and stopping mechanism actuable in one direction to stop the machine and set the auxiliary mechanism into operation and in the other direction to Stop the machine only, connections between the pattern cam shaft and the control lever for actuating the lever in the first direction, and other connections between the operating means and the control lever for actuating the lever in said other direction whenever the operating means operates improperly.

1l. A shoe sewing machine having, in combination, stitch forming devices, a shoe supporting jack, a pattern cam shaft, mechanisms actuated by the cam shaft for changing the positions of the shoe and operating means to present the shoe properly to the operating means as the point of operation is transferred along the shoe, mechanism for causing the machine to perform certain auxiliary operations after the stitching is completed, a driving and stopping mechanism, a control lever for the driving and stopping mechanism actuable in one direction to stop the machine and set the auxiliary mechanism into operation and in the other direction to stop the machine only, connections between the pattern cam shaft and the control lever .for actuating the lever in the rst direction, and other connections between the stitch-forming devices and the control lever for actuating the lever in said other direction whenever the stitch-forming devices operate improperly.

12. A shoe sewing machine having, in combination, stitch-forming devices, a shoe supporting jack, a pattern cam shaft, mechanisms actuated by the cam shaft for changing the positions of the shoe and operating means to present the shoe properly to the operating means as the point of operation is transferred along the shoe, mechanism for causing the machine to perform certain auxiliary operations after the stitching is completed, a driving and stopping mechanism, connections between the auxiliary mechanism, the driving and stopping mechanism and the cam shaft for actuating said mechanisms at the end of a seam, other connections between the stitchforming devices and the driving and stopping mechanism for bringing the machine to rest whenever the stitch-forming devices operate improperly, and means actuated by the pattern cam shaft just before the seam is completed to prevent stopping of the machine from improper operation of the stitch-forming devices.

OTTO R. HAAS.