US1599431A - Sewing machine - Google Patents

Description

Sept. 14 1926.

J. R. OLIVER SEWING MACHINE Filed lay 9. 1924 3 Shoots-Sheet 1 Ms @W T r mv Hu W0. m K w 5 b Sept. 14 I926.

J. R.-- OLIVER SEWING MACHINE Filed May 9 1924 3 Sheets-Sheet 2 lnvenTor. John R. Oliver by-;Rriw,ywia' Z1 My, ATTys'.

Sept. 14 1926.

1,599,431 J. R. OLIVER SEWING MACHINE Filed May 9 1924 v 3 Sheets-Sheet 5 Fig.3.

lnvenTor. John Roliver Patented Sept. 14, 1926.

UNITED STATES e was m an em a Ma ia a sse es ae e e sie e e SH I IAQHINE-RY c m-any.- Qr 305.1 me wm aea eQQW sI-WN 9 Y A E- EWI NG ivracninn,

application filed May 9,

shoe stitching machineofthe class known as. a welt-.andeturn stitching machine, in, Which.

the shoe insole is attached to the shoe upper,

and, in some cases, also to the welt strip.

One example of welt-and-turn-stitching .machine is shown in prior Patent 1,861,952 orra'nted December 14;, 1920 to Za1eski and gchoenky, although the present invention s applicable to shoe stitching or other sewing machines ofdifierent types.

' The present invention embodies improvements pertaining more especially to certain of the stitching instruments shown in the prior patent, including the worl; rest or socalled bumper and the weltfeeding and applying nieinber or'so-called back gage. The actuating means or operating connections for these instruments include, in the'prior patent, certain pawls or dogs cooperat ng with toothed racks, for holding the stitching instruments in proper position 'duringa certain part of the cycle in the formation of each stitch; This form of 'mechanism has proven' disadvantageous. An mproved mechanism has been disclosed in prior application of ZaleskiSerialNuniber 580,27 6 filed August 7 192. 1

The principal object of the present inventionis to afford a sewing machine in which the mechanisms and operations referred to are improved as compared with the prior structures, and'are simple, quickactin g,effective and durable. Other ob ec ts and advantages of the present invent on'will be explained hereinafter or will be apparent to those skilled in the art. To the attainment of such objects; and advantages the present invention consists in the novel sewing machine and the novel mechanisms. combinations, arrangements and devices herein illustrated or described.

In the aceompanyi pertinent parts of a shoe stitchingniachine embodying the present invention.

' Fig.2 is a right elevation showing certain not seen" in ng drawings forming a part hereof Fig. 1 is a left elevation of the 1924. serial as. 712,035.

Fig. 5 is an enlarged right elevationof certain parts seen in Fig. 2.

General features of construction and operation of the sewing machine, not forming a partof the present'invention, may he ascertainedby reference to the prior patent and application referred to, 1 and others, and

therefore are not herein illustrated except so far as convenient for thedescriptionof the present invention- I The herein illustrated machine may com-,

prise the usual stitchingflinstruments includingthe work-rest or bumper A against which the workman holds the shoe X. during stitching, also'the channel guide which en gages with the channel in the sole w, also'the oscillating, curved, hooked needle: C, 'ope -j a-ced' to penetrate the welt "w, the upper y and the lip i of the insole 10, also [the looper D, opera-ted toplace the thread in the harb in the needle, also 'the thread finger E2001 operating with the loo ei a' feedfdevice or awl, and'the back gage H against'whichthe work contacts at" certain timesiand which also serves as a guide and feeder'for the strip or welt. The usual take-up -will'be under stoocl. The work-rest Ais mounted atthe forward end of a sliding shankafland thev back gage Hat theforward end'of a similar shank h, through "which these" two inents are actuated or 'controlled.

The general operation may be as in the prior patent and application. At the starting pos tion of the machine both the ork.

rest and back gage are free, that is areheld forwardly by'spring pressure but canyield;

rearwardly to adapt themselves to the position ofthe shoe. During the period inwhich the needle is retracting from the work the work-rest is locked for-ward, thus holding the work forward and resisting therearward pull offthe' -needle. At all other times the work-rest is free and resiliently'adjusts it self according to the nianipulation'lof the shoe. The shoe of course is fed forwardly while the needle is out of the work and at" such times is. guided by the channelguide' The back gage H feeds the welt strip "to' the stitching point. While the work isjsta-g tionary, and after being disengagedby the xneedle,-'tlie back; gage isretracted, drawing welt from the-supply, later moving forward lOU ly and laying the welt in stitching position. The retraction of the back gage isiiot until after the needle has retracted out of the work, it being locked forward in the meanwhile, thus assisting the work-rest to hold the shoe forward during the retraction of the needle.

The machine may comprise an upright frame wall 10 wh ch supports much of the mechanism and forms a bearing for the stitching shaft 11, which may be a crank shaft having a crank 13 at the right or inner side of the wall, from which the needle and other instruments may, take their movement, as in the prior patent and application. 2

In the illustrated embodiment of the present invention the work-rest and back gage are controlled from asingle cam disk 15 secured to the shaft at the left of theframe wall. The disk 15 is shown as having two cam grooves, an inner one 16 and an outer one 17.

The yielding forward pressure upon the work-rest A. may be effected by a'spring 18, seen in Figs. 2 and 4. Likewise the back gage H may be pressed forwardly yieldingly by a spring 19 shown in Figs. 2 and 3. The shanks a and h of these two members are shown slidingly fitted in grooves formed in the right side of the frame wall, and near their forward ends they are confined therein by an attached confining plate 20.

The retraction of the back gage may be effected by the following mechanism. A foll0wer'22 engages the cam groove 17 and is mounted on an arm 23 of a lever fulcrumed at 24 and having a downward arm 25, the extremity-26 of which constitutes a hunter, arranged to cause the retracting movements of the-shank h by striking a rearward blow against a lug 27 projecting leftwardly from the shank. Leather washers 28 may be interposed between the hunter 26 and the lug 27, with a pin 29 passing through and holding the parts in position. The timing is such that-after the needle has retracted and the shank it has been released it is bunted rearwardly to the proper extent so as to effect feed of welt as described and to draw the back gage away from the shoe so as not to disfigure the leather during the feeding movement. The extent of retracting movement may be adjusted through a plate 30 longitudinally adjustable on the shank h and carrying the lug 27 I Although the back gage normally comes forward, when released, into contact with the shoe, it is desirable to have a limiting stop and for this purpose the frame wall may be provided with a lug 31 recessed to contain a fiber or other cushion 32. The rear end of the shank is provided with a lug 33 which carries an adjustable stop screw 34, the head. 35 of which is arranged to contact the stop cushion 32.

The thread finger E is herein shown actuating from the inner groove 16 of the cam disk 15 in the following manner. A cam roller or follower 37 is mounted on a cam lever 38, which is connected by link 39 with an arm 40 mounted in an adjustable manner on a rock shaft 41'... An adjusting connection 42, 43 between the link and arm permits change of throw of the thread finger E, which is adjustably mounted upon the shaft 41. The thread finger cooperates with the looper in placing the thread upon the barb of the needle.

It only rema ns to describe the means and operation for looking forward and releasing the respective shanks of the work-rest and back gage. These operations are all controlled by the cam 16 through a follower 44 mounted at the lower end of a cam lever 45 mounted on a rock shaft 46, all as seen in Fig. 1. The rock shaft passes through the frame wall 10 to the opposite side, and the remaining connections are shown in Fig. 2. However, the locking devices themselves will be described first and later the controlling connections from the rock shaft 46.

Tt will be noted that the identical cam groove 16 is used to control both the thread finger E and the shank locking devices. It has been observed that the short period in which the locking is in effect is about a half cycle removed from the thread finger actuation, and the groove has been adapted and arranged, through two separate followers, to effect both operations.

The-devices forlocking forward the workrest and back gage respectively areof a novel form and may be designated as grip arms 43 and 49 respectively. The construction is shown separately in Fig. 5. The grip member or arm 48 or 49 is shown as a swinging member having a rounded or other blunt nose 50 adapted to contact upon and wedge against the smooth lateral surface of the shank a or it. This wedge arm is of a substantial length and fulcrumed' at a point 51 spaced laterally away from the shank, the distance and the length of the arm being such that when the nose is brought into contact with the shank the arm is inclined only slightly from the normal or 90 degree position. 'The mountings are firm and solid so to give no yield. Bythis arrangement, when the grip arm is brought into contacting position, as shown,

in Fig. 5, it affords an immediate gripping action, the shank being positively held against movement ina rearward direction, indicated bythe arrow 52; while at the same time the device is capable of easy and quickrelease, namely by simply pulling the grip arm slightly away from its gripping position.

The drawings show the grip members accommodated within recesses 53 in the frame wall 10, and each member has a spring 54 two shanks may be controlled simultaneous ly, and the connections for operating the grip arms may be as follows.

The rock shaft 46 heretofore mentioned, oscillated by the cam 16, carries a clownwa-rdly extending rock lever 56. The lower extremity of this is connected to swing a sec- 0nd lever 57 which is fulcrumed at 58. A loose connection between the two levers is necessary and this is provided by a block 59 pivoted on the lever 56 and engaging a slot 60 in the lever 57 The lever 57 extends downwardly at 61, and thelower extremityis provided with a pivot 62, connecting it to a link 63 which extends rearwardly and at 64 is connected near the lower end of the grip arm 49. The link 63 is extended for wardly beyond the pivot 62 and this eX- tension 65 is similarly connected by a link 66 with the free end of the grip arm 48 by pivot 67. By this linkage a slight throw of the cam 16 is capable of moving both grip members 48 and 49 simultaneously into or out of gripping position. The same cam 16 is utilized that serves also to actuate the thread finger E. The connecting levers and links are proportioned and arranged to give the proper throw to the grip members at.

the proper points oftime and to the proper extent. The timing of these operations with respect to the retracting movements, already described, will be understood by those skilled in the art and is also made clear by the contours of thecams herein shown. The

described mechanism for operatingv and controlling the work-rest and back gage is simple, effective, quick-actingand durable.

In order to strengthen the mountings of the shanks a and h at their rear ends each of them may be provided with a confining plate 21., placed opposite to the gripping point at which the grippers 48 and 49 engage. The forward movement of the shank a may be limited by a stop pin 36 contacting the forward confining plate 20.

It will thus be seen that I have described a sewing machine of the class mentioned, embodying the principles and attaining the objects and advantages of the present invention. Since-niany matters of combination, arrangement, design, construction, and detail, may be variously modified without departing from the novel principles involved, no limitation to such mattersis intended except in so far as set forth'in'the appended claims.

iVhatis claimed is: p 1. In a shoesewing machine, the operating shaft,and stitching:instruments oper- 'ated therefrom, in combination with a member, engagoable with the WOIlZ, a slidable shank carrying the member toward or from the 'work,.and means for looking forward the shank at certain per1ods,"compr1s1ng a pivoted blunt-nosed grip-arm arranged to have-its extremity swung into locking engagement'with the sliding shank, at'a slight incline from right angles to the surface of the shank, and connections from the operating shaft to said grip arm comprising an oscillating part and a connection therefrom to the grip arm operating both'tothrust the grip arm into locking position and to swing it from position, in cooperation with the stitch forming operations. i

2. In a shoe sewingmachine, the operating shaft, and stitching'instruments operated therefrom, in combination with a memher en 'a eable with the work aslidablo I shank carrying the member toward or from u the work, and means for lOCl lI1g.l OI\VLl7Cl the shank at certain periods, comprising a pivoted blunt-nosed grip-arm arranged to have its extremit swun 1nto lOCklIl engagement with the sliding shank, at a slight incline from right angles to the surface of the shank, and connections from the operating shaft to said grip arm comprising a rock lever oscillated from the shaft, and a link connection from the rock lever to the grip arm, moving the latter both to and from looking position' 3. In a-shoe sewing machine a work rest, 6

a back gage, sliding shanks therefor," a swlnglng grip arm for locklng each shank forward, a rock lever, means for rocking'lt,

and connections from said lever to both grip.

arms, comp "ising linkage operating both to force the grip arms into locking position and move them from gripping position.

4. In a shoe sewing machine a work rest, a back gage, sliding shanks therefor, a swinging grip arm for locking each shank forward, a rocklever, means for rocking it, and connections from said i .ver to both grip arms comprising a link from the rock lever to one of said grip arms, and a link from said link to the'other of said grip arms.

5. In a sewing machine a member engageable with the work, and its slidable-shank,

a needle, a'looper, a thread finger, a shaft,

and connections for operating said elements, includlng a cam surface, two followers en gaging said cam surface, connections from one follower to actuate the thread finger and connections from the other follower for locking the shank forward.

6. In a shoe sewing machine a yielding member engaged by the shoe, a yielding shank supporting said member, a shaft, a needle, a looper, a thread finger cooperating with the needle and looper, a cam actuated by said shaft, two independent followers engaging said cam, connections from one of such followers'to the thread finger to operate it and means operated from the other follower for looking forward said shank at a certain part of each stitch cycle.

7. In a shoe sewing machine a yielding member engaged by the shoe, a yielding shank supporting said member, a shaft, a

needle, a thread handling instrument cooperating with the needle, a cam actuated by said shaft, two independent followers engaging said cam, connections from one of such followers to the thread handling instrument to operate it, and means operated from the other follower for locking forward said shank at a certain part of each stitch cycle.

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

JOHN ROGER OLIVER'

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