US1667046A - Welt-sewing machine - Google Patents

Description

April 24, 1928.

' J. R. OLIVER WELT SEWING MACHINE Filed Oct. 26, 1925 3 Sheets-Sheet 1 lnven'ror. John Roger Oiver 144, Afiys.

J. R. OLIVER WELT SEWING MACHINE April 24, 1928. w 1,665,346

Filed Oct. 26, 1925 3 Sheeis-Sheet 2 lnvenTor.

Joh n Roger Oliver mew KMWH & W,

A Tys.

April 24, 1928. I 1,667,046

J. R. OL'IVER WELT SEWING MACHINE Filed 00;. 26-1925 a Sheets-Sheet 3 \John RogerOl iver b j ww KM & MM Aliys,

Patented Ap1'a24, 1928. I I

PATENT oF-F cs.

JOHN noesn OLIVER, or Mann 1min, nAssac i-rsnr'rs, AssI'enon T0 Itasca SHOE Macnniare: co arnny, or Bosron, as

sncnusn'r rs, A con'ronario'n 'orfnAI' E- WELT-SEWING MACHINE.

Application filed October This invention relates to welt sewing machines and more especially to shoe sewing machines of the class known as the weltalthough the novel features are applicable to other machines for stitching welts or strips to various materials.

The gene'ral'object of the present invention is to improve the operation of such sewing machines and especially to afford a simple,,convenient and effective means for trimming or'cutting off the welt strip after the termination of a seam. This trimming device is used in association with a welt feeding or guiding means, and while I the welt trimmer might be used with any welt gu ding means, it is herein for convenience shown applied to a machine having a welt guide means similar to that shown inmy prior application Serial Number 21,544, filed April 8, 1925. Other and further objects and advantages of the present invention will be.

pointed out in the hereinafter following description of one form or embodiment of the invention or will be apparent to those skilled in the art.

To the attainment of the aforesaid'objects and'advantages the present invention consists in the novel sewing machine and welt trimming mechanism, and the several novel features of combination, arrangement, operat-ion, construction and detail as herein il'-' lustrated or described. I y

In the accompanying drawings Fig. 1 is a righthand'elevation of a portion of a shoe sewing machine, showing the parts particu larly concerned in the present invention Fig. 2 is a left hand elevation of the parts shown in Fig. 1.

Figs. 3 and 4 are partial left hand 'eleva-j tions showingthe parts in stages of operation different from that in Fig. 2.

Fig. 5 isa detail front elevation taken partly in'section on the line 55 of Fig. ,2.

Fig. 6 is a diagrammatic front elevation showing the preferred relation of the well: trimming blade of the present invention to the welt guidemeans and associated partsof said prior application.

The vertical frame wall 10. may be the left hand one of filled/W0 frame walls usually embodied in the Reece Welting machine; as

of which there are many types,-

26, 19.25, Serial No. 65,014.

shown in several, priorpatents. The main shaft 11 may have its bearings in the frame wallsas shown, and this maybe a crank shaftyoperating the needle and other instrumentalities through cranks, links, and levers, in accordance with the Reece type pf welting machine. ,tric 12 secured to the main shaft, thi's eccentricoperating upon an oscillating yoke 13 from which extends a link 14 to a. certain part of the needle mechanism, .namelythe connections which, at the completion pf a seam, operate to restore the needle to normal operation. These p'arts12, 13 and 14 are at the left or outer side .of'theframe wall 10. At the innerside of the wall is shown an ir regular bracketor casting 15 secured fixedly to or formed with the framewall and havi'ng various extensions as indicated by the reference number 15applied thereto. The parts thus far described maybe preexisting parts of the welting machine, although modified somewhat, as will b'e explained, to acconmoodate the present improvement. The needleC may be of the usual. curyed, barbed type, oscillating about an axle 16.

The work may be held against the, usual type of work rest A during stitching and maybe advanced to the left the usual feed mechanism, while the welt strip to is laid againstthe shoe and stitched to the The drawings show an e'ccen upper and insole lip as more particularly explained in said prior application.

The welt guiding means-as before stated, may be similar to said prior. application, and includes an elongatedguide member 17 containing a passage or conduit through whichi the Welt travels and is laid smoothly and tangentially against the shoe, this conduitmember' being preferably held continu ously in engagement with the shoe, either by springpressure or. by locking means, incontradistinction to being intermittently retracted. A stop arm'18mis shown limiting the forward swingingmovement of the welt guide, when the work is removed. The conduit member or welt guide 17 is mounted at the lower end of a swinging arm 19 mounted on an. axle 20 which extends from a portion of the bracket 15 to another bracket or frame part 21. v i

At the end of a stitching, operation a Stop motion is. usually applied to, bring the ma+ chine to rest with the needle. fully retracted .rearwardly. out of the work;zth;fledleh Lil ing been manipulated abnormally in the last stitch cycle so as not to receive a loop but to retract empty. The shoe, carried by hand throughout the stitching operation, is now free to be advanced by hand and withdrawn from the machine, the welt however requiring to be severed; and this invention provides a convenient severing means, operated under manual control, for severing the welt close to the needle and welt guide, avoiding the necessity of drawing out excess welt for the purpose of manual cutting thereof.

, The cutter blade 23 is shown diagrammatically in Fig. 6, being preferably in or near the plane of the swinging movement of the curved needle G, and closely to the left of the extremity of the welt guide 17, but preferably'out of contact therewith to avoid in jury to the sharpness of the cutting blade. The welt w is thereby cut in close proximity to the exit of the conduit member by which the welt is guided to the work, and it may be severed by a sort of shearing action without the necessity of gripping or holding the welt during the cutting. Following the cutting the stitched shoe may readilybe removed and a new piece of work brought to position,

and the welt suitably advanced in preparacutter is inoperative but in readiness to be operated at the finish of the stitching. The parts go through three intermediate positions when operated and Fig. 3 shows infull lines the position next succeeding that of Fig. 2, and in dotted lines the position next succeeding that, while F 4 shows the position of the parts in the process of being restored to the normal or Fig. 2 position.

A. cutter blade 23 is shown firmly attached to a curved oscillating carrier having rack teeth 25 along its outer edge and fitted to move toward and from the work in a guiding groove 26 in the irregular casting 15. Fig. 1 shows in full lines the blade and carrier retracted while the dotted lines show the advanced position of the blade, the forward sharpened edge of which may correspond more or less with the curvature of the welt strip '11:, although an exact correspondence is not preferred, as the slight difference shown. enables the blade to cut progressively through the material of the welt. When the device is operated the carrier and blade are movedforwardly as indicated, to cause the cutting of the welt, near the welt guide, as already explained whereupon the parts are promptly' retracte'd to normal position and there latched as will beexplained.

The immediate operating element for the cutter carrier is shown as a pinion 28 meshby oscillate the welt cutter.

The reciprocation of the rack bar 32 may be effected for example by a toggle mechanism connected to an extension 35 at the upper rear side of the bar. Thus a double toggle 36 is pivoted to the extension 35, while a pair of upper to les 37 are connected at the 2:1". middle by pivot pin 38 with the free end of the lower toggle. per toggles are interconnected by a pivot pin 39. This for reasons to be explained does not engage a simple fixed pivot'hole, but is arranged in an elongated pivot slot 40 having a notch 41 at its lower end which can accommodate the toggle pin 39 when the parts are in a certain position. A spring 42 pulls down upon the toggle pin 39, tending to open the toggle, that is move the links away from a position of alinement. The fulcrum slot 40 is shown formed in a plate 43 'secured to the frame wall 10. It may be so secured by means of adjusting devices 44 consisting of screws and slots. By such adjustment of the plate 43 upwardly and downwardly the normal or retracted position of the parts can be accurately determined, and thereby the position of forward movement of the cutter blade can. be determined. In this manner when the blade edge is worn the plate 43 may be adjusted down- The upper ends of the up wardly slightly to restore the proper relation of the blade to the welt guide and welt.

From the described mechanism it will be seen that when pressure is applied from the front to straighten the toggles, the pivot pin 39 will enter the notch 41 and the toggles will straighten out from the position of 2 to the full line position of liig. 3, thus throwing down the rack bar and open ating the cutting blade. For this purpose a toggle operating rod 45 shown, the rear end or head 46 of which flat and passes between the pairs of toggles,having a hole which accommodates the floating toggle pin 38. The rod 45 is shown'having a flange 47 to the front of the toggle pin, audits rear end is enlarged for a purpose to be described. The extreme front end of the toggle rod 45 is pointed at 48 to form a wedge operating to reset the latch to be described, and slightly to the rear is shown a notch or recess 49 normally receiving the latch. The actual rearward movement of rod 45 to operate the cutter may be produced by a strong spring 50 surrounding-the rod and pressing on the sion of the spring is effected by power, the

, operator having only to swing the latch.

The rod slides forwardly andrearwardly in a guidesleeve 51 which at its'forward end has a head 52 and a downwardly extending rigid arm 53; also a post 54 which extendsto theframe wall and is formed with a swivel pin 55 extending through the wall, so that the guide sleeve 51 may swing upwardly and downwardly to accommodate itself to the toggle motion. J

The latch 56 is pivoted to the arm-53and is arranged to engage in thenotch 49. The latch has a downwardly extending tail 57 by which it may be swung to release the toggle rod and spring, and a, stop pin- 58 .determines the normal position of the latch, where it is held by a spring 59; The latch tail 57 stands in a convenient position at the front of the machine and to the left of, the sewing pqint, so that the operator can readily swing the latch, or'strilre it with a part of the shoe, thereby releasing the parts and causing the cutti-ngof the welt, with minimum inconvenience. g

It will be understood that when the latch is operated and the spring released the toggle rod is thrown clear to the rear from the Fig. 2 position to the dotted line position of Fig. 3, thusboth advancing andretractin'g the cutter. In order to reset the mechanism and compress the spring the head- 46v oft-he p toggle rod is arranged to be pressed forwardly by power, at a proper time, so as to restore the original condition. This may be done by a resetting lever 61 fulcrumed at l 52 on the frame plate 10' and connected by a linlr63with. a portion of the oscillating yoke 13 alreadyreferred to. By this arrangement the power of the"mainshaft,11 is used to oscillate the resetting lever 61. 'A cushion may be interposed between the lever Gland the toggle rod to minimize the blow and vibration, although the contact will be a gentle one in view of the fact that the eccentric inherently operates to start the lever slowly into motion, the motion becoming more rapid after the lever hascontacted the rod and is thrusting it forward to reset position. During stitching thelever '61 is constantly idly oscillating, and in order to prevent repeated light taps by the lever upon the rod an. arrangement may be employed to hold the rods slightly forward of contacting position, to avoid this tapping. The rack bar 32 may be utilized by suitable connections to cause the advance of the welt to the extent of about one inch in the retracting movement of the bar, so that after the-welt is cut it will be thrust forwardly to project a convenient distance from theguide toassist the starting of the next sea-m.

The operation of the described invention may be substantially as follows. vDuring stitching-the power shaft 11 drives the stitching instruments, and at the end of the seam a stop, motion may operate to bring the parts to rest with the needle retracted,

and free from the thread, for example as in my prior Patent 1,532,634, granted April'Y, 1925- The operator can then move the shoe in such manner asto strike the'latch 57 thus releasing the confined spring 50. This first straightens the toggles, whichpass from the Fig' 2 position tothe full line position of Fig. 3. The upper toggle pivot pin 39 'is held by the notch 40,'so that the lower toggle is active to thrust down the thereby operate the cutter. 1 The actual cutrack bar 32' and 1 ting is performed under great power due to I the force of the toggle links when approaching their closed or straightened position.

The parts do not remain in this position as the links continue their movement to the dotted line position ofFig. '3, thus instantly retracting the'cutter. This double acting toggle arrangement thereforefgives' a quick powerful and effective action with both ad The is avoided by the described slidingpivot or I slotted fulcrum ;f0r'the upper togglepivot in 39. Thus Fig. 4 shows the position that the parts are midway of the restoring'st'roke.

The resetting leverfiltbeginsto act after the "needle has entered the work. As it thrusts forwardly on the toggle rod, to compress the spring, the upper toggle pivot'pin rides out of the notch 41 and slides upward in the slot j 40, against the tension of the spring 42,]to the position seen in Fig. 4. .In this way the lower toggle is rendered inoperative and the upper toggle becomes active on the resetting stroke,fand the cutter is not actua'ted. As the forward motion of-the toggle rod continues itsta'pered front end 48 operates to thrust aside the latch 56, so that as the for ward motion is completed the latch will drop into the notch 49 near the front end of the rod, thus restoring the parts to originalposition. i

It will thus be seenthat there has been described 'a welt sewing machine embodying the principles and attaining the advantages of the present invention. Since many mat ters of combination, arrangement, design and detail may be variously modified without departing from the principles of the invention it is not intended to limit the invention to such matters except to the extentspecified-in the appended claims.

What is claimed is other worlga cutter fitted to move to the welt and sever it, aspring understrain arranged to actuate the cutter to advance and sever the welt, power means for putting the spring understrain, and alatch for holding the parts in set position.

2. In a welt shoe sewing machine, a welt guide arranged to apply the welt to the shoe, a needle to stitch the welt to the shoe, a cutter normally inoperative arranged to advance to sever the welt, a spring operating means for advancing the cutter, and a latch device holding the cutter retracted, said latch being located so that it may be contacted by a part of the shoe/to release and cause operation of the cutter.

3. In a welt sewing machine, a, shaft, a needle operated. from the shaft, a welt guide member guiding the welt to the shoe or otherwork, a cutter fitted to move to the welt and sever it, means for actuating the cutter after the stitching, and a control means comprising an operating member for setting said actuating means into action, located to be operated at will by striking the same by a part of the work.

' 4:. In a welt sewing machine, a welt guide arranged to apply the welt to the work, a needle tostitch the welt to the work, a cutter normally inoperative arranged to advance to sever the welt, a spring operating means for advancing the cutter, and a control lever for releasing the spring at will by a striking movement of the work.

5..A welt sewing machine as in claim 2 and wherein is a latch resetting means con,- sisting of a constantly vibrating part operating upon restarting the machine.

6. In a welt sewing machine, a welt guide arranged to applythe welt to the work, a needle to stitch the welt to the work, a cutter normally inoperative arranged to advance to sever the welt, a spring actuated means for advancing the cutter and retracting it, the same adapted to be reset after operation, means for resetting the spring, and a latch device holding the parts in set position, until released. I

7. in a welt sewing machine, a welt guide, a welt cutter fitted to advance to the welt and sever it and return to retracted position.

position of the cutter.

a toggle pair normally open arranged to he straightened to closed position and thereby advance the cutter to the welt, and means for actuating the toggles.

8. A welt sewing machine as in claim 7 and wherein the toggle actuatingmeans comprises a spring, power means to reset the spring, and a latch device holding the spring reset. 1

9. A welt I and wherein the toggle actuating means comprises a rod connected to the toggle, a

spring pressing the rod, the rod having a operated by such movements of the toggle for advancing and retracting the cutter, and means for actuating the toggle.

11. A. welt sewing machine as in claim 7 and wherein one toggle link is connected to the cutter, and means for adjusting the ful- 'crum of the other link to set the advanced 12. A welt sewing machineas in claim 10 and wherein one toggle link 1s connected to the cutter, the other having a sliding fulcrum, with means holding the fulcrum on the operating action, and releasing it on the return action, whereby the cutter will not be operated in resetting the toggle.

13. A welt sewing machine as in claim 1 and wherein one toggle linkis connected to the cutter, the other having a sliding tulcrum, with means holding the fulcrum on the operating action, and releasing it on the return action, whereby the cutter will not be operated in resetting the toggle, spring means causing the operating action of the toggle, and powermeans causing the return movement thereof.

In testimony whereof, I have affixed my signature hereto. 1

JOHN ROGER OLIVE 1 60 sewin machine as in claim 7 i

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