US1716561A - Sewing machine - Google Patents

Description

June, 11, 1929. V 1.716.561

SEWING MACHINE Filed April 25, 1925 3 Sheets-Sheet 1 O Q lnvenToT.

John OHveT WW I WMLW A'ITys.

June 11, 1929. UVER 1 1,716,561

SEWING MACHINE Filed April 25, 1925 3 sheets-sheet 2 "Fig.8. 11

. lnvenTor.

Qohn ROHver ATTys June 11, 1929.. 1,716,561

SEWING MACHINE Filed April 25, 1925 3 Sheets-Sheet 5 lnvenTora--- John R.O\iver ATTys.

' erations.

Patented June 11, 19229..

UNITED stares- JOHN ROGER OLIVER, or MnnnIEitn, MAss'aoHusn'rrs, ASSIGNOR To REECE snon" earner or-Fics.

MACHINERY COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION MAINE.

snwnve MACfiINE.

Application filed April 25, 1925. Serial no. 2 5,752.

This invention relates to sewing machines; and more especially to sewing machines wherein a barbed needle is operated normally to advance through the work to receive a thread loop and to retract to draw such loop through the work, with a cooperating looper operated toplace the thread in the barb of the advanced needle, and with a take-uptor drawing tight the successive stitches, such machines usually comprising a power operated stitching shaft and timed connections from the shaft tor actuating the needle, loopor and other instruments in harmony through cycle after cycle during normal stitching op An example or" such maclnnes isthe shoe stitching machine known as the welt-andturn machine, in which the. barb needle is curved and swings about a center in its advancing and retracting movements. The prior patent of SchoenkylAQOtSO of June 2t. 1922, and the prior patents therein re ierred to, are examples of the specific typeot machine referred to. p v

The general object of-the present invention is to improve the, operation and convenience of sewing machines of the kind referred to, and a specific object is to provide means operative upon the stoppage of the machine for causing the needle to undergo an abnormal stroke. for example by shortening the advance stroke, so that the barb will not receive a loop from the looper, and so that when the machine is finally stopped with the needle tully retracted the work canbe readily removed without hindrance from the needle or thread. The prior Patent 1,420,580 referred to shows one form of mechanism for accomplishing this object, and said patent may be referred to for the disclosure of many details unnecessary to the description of the present improvement. It is an object of the present invention to simplify the needle actuating connections as shown in said Patent L l-20.580, as well as the mechanism for changing the needle stroke from normal to abnormalduring the final cycle or when stopping the machine. and to render the same more effective inoperation, durable, and. convenient in use. I

the attainment of the objects and advantages 'reterred to the present invention consists in the novel sewing machine and the novel features of combination, arrangement and structure herein illustrated or described. The invention might be embodied in number less mechanical forms, but by wayof illustratlon, the accompanyingthree sheets of draw- I Fig. 3. is a top plan view of certain parts shown partly in section substantiallyon the line 38ot Fig. 1. i

Fig. 1 is a rear elevation of the parts shown in the other figures. a 5' is a right elevation corresponding partly with Fig. 1, but showing the mechanism in full running condition, with the needle fully advanced. j i

Fig. 6 is a partial "front elevation showing particularly the connections to the stop'mo- 'ings are presented showing a welt-and-turn tion, the stop'motion itself being omitted eX- cept for the control orpedal rod, which may correspond for example with my prior Patv ent 1,532,634 of April 7, 1925, referring to stopping and starting mechanism for shoe stitching machines.

The preferred operation of a mechanism of the class hereof is substantially that when I the pedal'is released-by the toot, or'other con trolmeans operated to apply the stop motion, the actual stoppage will be delayed. for a complete stitch cycle or longer,'during which certain operations automatically take place. For example at a certain point in the stitch cycle a readjustment of the needle connections will be effected so that the final advancing stroke of'the needle will be shortened, the stop motion thereafter coming into effect so. that. when the needle is fully retracted .the machine willlcome to a final stoppage with the needle disengaged both from the work and from thethread, so that the work can readily be extracted; and with the present embodiment the final stoppage is accompanied by a restoration of the needle actuating connections to normal condition, so that the machine is in readiness tobe restarted, or can be turned by'hand andafiord, the'us'ual sequence of operation. y

A complete illustration of the various stitching instruments 1s unnecessary but the drawings show the work rest or bumper A,

"supported at the front end of its shank a, constantly pulled by spring a, and having means to lock it forward at certain times, as is well understood. The curved barb'needle C is shown mounted on a carrier a, turning about a center A needle guide C is shown; also a looper D, operated to move around'thc needle path in a Well known manner.

,The machine frame may comprise an up I right post extending from the power conneedle carrier-or block 0.

A specralarrangement consists. of a ful nections at the'floor to the head of the machine, and one or more foreand aft frame walls, such as the left wall 11.

The stitching or operating shaft 13 takes its hearings in the frame wall 11 and elsewhere, and at the left or outerside of the wall theshaftis provided with a cam disk 14, while at the right or inside is shown a crank 15. lVhile there may be other cranks andother camdisks these two suflice for the operations of the mechanism of the present invention.

The needle oscillating connections may in elude a pitman 17 on the crank 15, the free end of the pitman guided by an arm 18fulcrumedcrum block 26 on the axle arranged slidingly within a curved slot 27 in the hub 22 of the needle lever. The normal position is as shown in Figs. 1 and 5, but when the abnormal operation takes place, as already referred to, the needle lever hub 22 is caused to drop to the position shown in Fig. 2, which manifestly operates to shorten the final adyanCQ needle stroke. T h s arrangement constitutes a substantial simplification overthe compound needle lever arrangement shown in Patent 1,420,580.

-The upward and downward adjusting movementof the needle lever hub may be effected through a link 30. This link extends downwardly and has pivoted to its lower end a latch finger 31 w iiclrextends up wardly to the rear and is there provided with a latch or hook 32, having a rear extension 33 by which it may be unlatched; a spring 34 acting to press the finger rearward toward latching position. The lower end of the link is also provided wlth astud orroller 35 adapted to move along a guide or cam'slot 36 formed in a special bracket or wall 37' which also servesto support a hardened steel latch piece 38 arranged to be normally 'engaged by the latch 32, as seen in Figs. 1 and When the latch is unlatched, in a manner to be described, the stud 35 is free to move along the cam slot 36. A spring 40 pulls forwardly on the link and stud and thus causes the stud totravel along the slot, which extends at a downward slant, increasingin- It will thus be seen that the readger 31 at the proper point of time. As seen in 1, 3 and 5 an up standing finger 42 is arranged to press upwardly against the latch extension 33 to lift and disengage it from the latch piece 38. The extremity of aspring 43, coiled around the pivot of the unlatching finger 42, operates always to press the latter forwardly into operative position. The unlatching finger is pivoted to a supporting lever 44 which extends forwardly and is fulcrumed at 45 so that its rear end may swing up and down for unlatching operations. The middle part of the supporting lever 44 is provided with a fulcrum 47 on whichv is pivoted a control lever 48. This lever has a rear extension 49 formed with a slot 50 which normally, as seen in Fig. 5, is substantially concentric with theaxle 25, for purposes to be described. Near the front end of the control lever 48 is shown a laterally extending guard pin 51.

The connections for operations, through. the described l vers 44 and 48, may comprise a stud 52 carried on a lever and arranged to vibrate forwardly and rearwardly in the curved slot 50 in the control lever 49. The lever may he oscillated in proper ha molly with the other operations by the following connections; The upper end of thelevcr 53, above the fulcrum axle 25, is formed into an arch 54, whiclnas seen in the rear view of Fig. 4, extends back to the axle or rather to a; sleeve 55 sari-minding theaxleand extending j w: dly through the wall 11,- where the sleeve carries a rock arm 56 connected by link 57, as shown also in dotted lines in Fig. l, with a bell crank lever 58 car wing roller or follower 59 engaged in a cam groove 60 in the cam disk 1.4.

By this arrangement the cam. 60 operates to swing the lever 53, and its stud 52 moves in the slot 50 of the control lever 48, normally without effect, since, as seen in Fig. 5, said slot is normallyconcentric witl the fulcrum axle 25. Normally therefore the motions of the lever 53 can not effect any motions of the supporting lever 44 "or the unlatching finger 42. hen the read ustments effecting the unlatch- 4 take place, which will be described, the lever 53 will effect unlatching of the latch 31 at the proper point of time. i

The position of the slotted control lever 48, fulcrumed on the supporting'lever 44, may be controlled in the following manner. A link 62 with spherical ends is shown engaged atits top end with a socket at the underside of the lever 48, while its lower end a socket in ,a lever 63, seen in Figs. 1 and 6. A spring pulls the lever-48 toward the lever 63, thus making the link 62 effective, while permitting universal motions. The lever '3 is shown as a horizontal lever ar- 'anged below the head of the machine, pivoted near its center, and extending to the left, where its slotted extremity (35 engages with the stud at the right end of a lever arm 66, the other arm 67 extending to the left. where its slotted extremity engages a pin 68 mounted on the upright pedal rod 6th The tinue the motion to a definite final position,

with the needle fully retracted from the work.

When the pedal is wholly released the pedal rod and connected parts will first rise to an intermediate point, stopped by a guard 7 to be described,the stop motion not taking effectuntil the guard releases the parts to permit a completion of the movement. The partial rise of thepedal rod causes the link 62 to lift the front end of the lever 48. This shifts the lever 48 from the position shownin Fig. 5 to a position slightlv lower than that shown in 1, and with the guard pin 51 of the lever 48 in cont ctwith, and held down by a guard bolt 75, or rather the lateral flange 7 6 thereof, as will be understood by the relaf tion of these parts shown in Fig. 5.v The guard bolt is shown as a sliding mernher extending forwardly and rearwardly. positioning pin 77 normally contact ngthe hearing or slideway 78. while a spring 79 pulls the bolt rearward. the bolt having a 1 ear extension or pin 80 which slides in a portion of the bracket 37 and projects into the slot 36. so that when the stud is pulled forward to the lowest point of the slot 36 the stud will strike the pin 80 and force the guard bolt forward from above the guard pin 51, thus releasing the latter and permitting a furtherupward movement of the lever 48, namely to the position shown in. Fig. 1. so as to raise the unlatching finger 42 to an abnormally high position.

From this description the operation will;

Ithas a be understood, but may be preferably restated as follows. lVhile the pedal is held down the stitching proceeds, the speed sometimes being regulated by slightvariations in position of the depressed pedal. When the I pedal is released by the foot it rises to an in termediate point, being stopped by the contact of the guard finger 51 of the lever 48 against the flange 76 of the guard bolt 75.

Fig. 5 shows the normal position with the pedal down and from this figure will be understood how the guard confines thepin 51 against completely rising. The holding down of the pedal prevents the stop motion becoming operative. The partial rising of the lever 48 however throws down its rear extension 49 from the Fig. 5 position to that of Fig. 1, rendering the slot 50 eccentric. Theree upon thepin 52, vibrating in the slot, on its next rearward stroke, forces upwardly the rear ends of levers 44 and 48. The unlatching finger 42 is thereby thrust upwardly from the Fig. 5 position. and dislodges the latch 32 from the latch piece 38. The spring 40 at once asserts itself tending to pull the link 30 from theposition shown in Figs. 1 and 5 to the position shown in Fig 2. This motion, however, is controlled by the lever 53.

the stud 35 bearing against the lever and moving forwardly as permitted by the return forward stroke ofthe lever. When the stud 35 reaches its full forward position, as seen in Fig. 2, it strikes the pin 80 of the guard 7 5 and thereby releases the guard pin 51011 the lever 48. This in turn, by releasing the lever 48, releases the pedal rod, which is thereupon" forced upwardly to the full extent, thus rendering operative the stop motion. The rotation of thepartscontinues until thestop motion has brought the shaft to rest with. the needle fully retracted. In this final movement the lever 53, swinging rearwardlyto its final stopped position, as seen in Fig. 1. forces V the stud rearwardly in the cam slot 36. thus eleva-tingthe stud, and at the same time re storing the needle lever 21' to normal condi tion, and applying the latch 32toithe latch piece 38, the unlatching finger 42 taking the final position as seen in Fig. 1. The-parts are nowin normal position ready for restarting; The lever 48 will be restored to its orig inal position when the pedal isdcpressed. and

the lowering of the guard pin 51 will release the guard '3 5 and permit it to resume its initial position, while the lowering of lever 44 pulls down the unlatching finger to operative position; so that restarting the machine resets the mechanism for stopping.

It will thus be seen that there has beendescribed a sewing machine of the class 'referred to embodying'theprinciples and attaining the objects of the present invention."

Since many matters; of combination, ar-

rangement, structure and form may be variously modified without departing from the principles it it not intended to limit the invention tosuch'matters except so far as specified in the appended claims.

lVhat is claimed is:

1. In a power driven chain stitch sewing machine, a main shaft, stitch forming means including a barb needle and means for applying thread to the needle barb when advanced, a needle actuating lever, connections from the shaft for vibrating thelever to ad Vance andv retract the needle in cooperation With the thread applying means, said lever having a shiftable hub, resilient means for sh fting such hubto modify the movement communicated to the needle whereby it will avoid taking thread, a 1 latch holding the hub 111 normal position, stopping means for stopping the machine withthe needle re; .tracted, means for unlatching SZlCl latch when stopping the machine, whereby to .modify the needle movement as stated, and

timed means operating during the final retraction of the needle for resetting said latch.

QQ'In a sewing machine an operating shaft, a barbed needle, actuating mechanism operated from the shaft to advance and retract .the needle, means, to apply thread to the advanced needle, said actuating, mechanism being adjustable to modify the needle stroke to avoid taking thread, a stop mechanism for bringing the shaft to rest with the needle retracted, a controller operable to apply said stop mechanism, a guard pre venting full movement of the controller, ad

'justing means for adjusting the needle actuating mechanism to abnormal, a latch means holding said actuating mechanism in normal adjustment, connections operated by the partial movement of the controller for releasing such. latch means, and means for thereafter rendering said guard inoperative.

3. In a sewing machine a barbed needle, needle actuating mechanism acjustable to abnormal. to shorten an advancing stroke of the needle, a latch devicenormally maintaining the mechanism in normal adjustment, timed means for releasing said latch device to permit such abnormal adjustment,

and automatic means restoringthe parts to.

normal adjustment, during the succeeding retracting movementof the needle;

4. In a sewing machine a stitching means 'ment as the machine stops.

5. In a power driven chain stitch sewing machine, a mam shaft, stltch forming means including a barbed needle and means for'ap plying thread to the needle barb when advanced, a needle actuating lever, connections from the shaft for vibrating the lever to ad- Vance and retract the needle in cooperation with the thread applying means, said lever having its hub shiftable. at the fulcrum, resilient means for shifting such hub to modify the movement communicated to the needle whereby it will avoid taking thread, a latch holding the hub in normal position, stopping means for stopping the machine with the needleretracted, means for'unlatching said latch when stopping the machine, thereby allowing the resilient means to shift such hub, a pedal controlling the power drive, with connections to operate the stopnin means on therelease of the nodal a m o 7 guard delaying the action of the stopping means on the release of the pedal, and a connection whereby the action, of shifting"- the needle lever hub renders said guard inoperative.

6. In a power driven chain stitch sewing machine, a main shaft, stitch forming means including a barb needle and means for applying thread to the needle barb when 'ad- I vanced, a needle actuating lever, connections from the shaft for vibrating the lever to advance and retract the needle in cooperation with the. thread applying means,

said lever havin a shiftable hub a sirin constantly tending to shift such hub to modify the movement communicated to the needle. whereby it will avoid taking thread, a spring latch normally preventing such shifting, means for releasing saidlatch to permit the spring to so shift the hub, and other means for restoring and latching the parts. j 7, In a power driven chainstitch sewing machine, a main shaft, stitch forming means including a barb needle and means for applying thread to the needle barb 'when vanced, a needle actuating lever, connections from the shaft for vibratin the lever to advance and retract the needle in cooperation with the thread applying means, said lever having afshiftable hub, a resilient device constantly acting. on such hub for shifting it to modify the move: ,ent communicated to the needle. whereby the needle will avoid taking thread, a lat 1 normally holding the hub in normal position but permitting it to be moved by said resilient dev,

when lunlatched, stopping); means-for story" ping the machine with the'needle retracted,

means forunlatching said latch whenstop JOHN noses OLIVER.

when

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