US549537A

US549537A - Tacking attachment for sewing-machines

Info

Publication number: US549537A
Authority: US
Publication date: 1895-11-12
Anticipated expiration: 1912-11-12

Description

i (No Model.)

J. D. .SGHOONMAK-m.

TAGKING ATTACHMENT FOR SEWING- MACHINES.

No. 549,537. Patented Nov. 12, 1895.

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UNITED STATES yPATENT OFFICE.

JOHN D; SCHOONMAKER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE LENOX MANUFACTURING COMPANY,- OF JERSEY CITY, NEW' JERSEY.

TACKING ATTACHMENT FOR sEwlNc-MAcHlNEs.

SPECIFICATION forming part of Letters Patent No. 549,537', dated November 12, 1895.

Application iiled May 22, 1893. Serial No. 475,168. (No model.)

of the city of Chicago, county of Cook, State of Illinois, have invented certain new and use- Vful Improvements in Tacking Attachments for Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the said invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings.

My invention has for its object to provide an attachmenth for sewing machines which shall be adapted to tack the corners of pockets, buttonholes, crotches, rbc., wherever the parts are subjected to special strain, which would otherwise tend to rip or tear the sewed parts of the garment.

To this end my invention consists of certain novel devices and combinations of devices, which will be hereinafter fully described, and be defined inthe claims.

My attachment is illustrated in the accompanying drawings, wherein, like letters referring to like parts throughout the several views- Figure l is a plan View of the device with some parts broken away. Fig. 2 is a side elevation of the same. Fig. 3 is a vertical longitudinal section'throngh the device on the line X X of Fig. 1. Fig. 4 is a bottom plan view of the device; and Fig. 5 is a partial vertical section on the line X2 X2 of Fig. 3, looking from the left, with some parts broken away and others omitted.

c c c? represent, respectively, the bed portion, the cam-wheel casing, and the lugs for embracing the presser-foot bar, all of which parts are formed integral with each other and constitute what may be termed the fixed body or frame of the device. One of the lugs a2 is provided with a jam-screw a3 for clamping the device to the presser-foot bar of the sewing-machine, and thereby securing the same in its proper working position.

Inthe fixed casing a is j ournaled a shaft b, which extends outward slightly beyond the casing at one end and has fixed to its external or projecting portion a ratchet-wheel Z9. On

the said shaft b, between the casing a and the ratchet-wheel b, is pivoted a lever h2, which is provided with a spring-held pawl b3, in engagement with the ratchet-wheel b'. At its forward end the lever b2 is provided with a pair of jaws b4, adapted to embrace the jamscrew which secures the needle to the needlebar of the sewing-machine and be clamped by the said jam-screw to the needle-bar when the device is in working position. Hence, under the action of the needle-bar, the lever L2 will be croked up and down, and, through the pawl and ratchet b3 o', the shaft b will receive a step-by-step rotary motion in a constant direction. On the said shaft b is mounted a peripheral cam-channel wheel b5 h6, which is fixed to the shaft, as shown, by a set-screw hl. On the said shaft and fixed to the ends of the cam-wheel b5 are mounted a pair of beveled gear-wheels hs, arranged so that the teeth of the two wheels face each other and project beyond the cam-wheel. The cam-channel b of the cam-wheel b5 is engaged from below by a roller b on a stud Z910, formed integral with a lever bu, which is pivoted to the fixed part of the frame at its rear end, as clearly shown in Fig. 3. As shown, the pivot consistsY of a set-screw 512, the body or upper portion of which has screw-threaded engagement with a suitable seat formed in the fixed frame and the lower portion of which is reduced in respect to the body portion and is screw-threaded for adapting the same to be engaged by a nut Z913. The projecting stem of the set-screw 612, as well as the shank of the nut Z213, works through a slot c in a clamping-plate c and through a slot or opening d in the cloth-clamp slide d. On the lever hu and having dovetailed enga genient therewith is mounted a cross-head slide Z914, which may be clamped to the said lever Z911 in any desired position thereon by a setscrew 515, which works through a longitudinal slot c2 in the clamping-plate c. The clothclamp slide CZ is provided with a serrated cloth-clamp d2 at its forward end, which is connected to the slide by loose rivets d3 in such a way as to permit a limited pivotal movement of the said cloth-clamp d2 in respect to the slide d. The cloth-clamp d2 is providedpwith a needle-passage d* of the proper IOO dimensions to aiford the requisite play of the cloth-clamp in respect to the needle under the action of the device. The cloth-clamp slide (Z is provided with a longitudinal slot (Z5 in its rearward portion, through which works the body of a shouldered set-screw CZ, the reduced or -screw threaded portion of which engages er is tapped into the fixed frame of the device. The said shouldered set-screw d works through the clamping-plate e and serves to form a pivot or fulcrum for the oscillatory lor laterally swinging clothclamp slide (Z/ and the clamping-plate c when the parts are in working position.

From the foregoing statements it is obvious that the cloth-clamp slide (Z/ is held between the bed portion a of the frame and the clamping-plate c bythe parts Z112Z113Z115and the pivotscrew (ZG. The slot c in the clamping-plate c and the opening or longitudinal slot (Z in thc forward part of the clamp-slide (Z/ are of the proper lateral dimension to afford elearance, with respect to the fixed nut Z113, for the lateral swinging` motion of the cloth-clamp. The cross-head slide Z114 is of a size to exactly fit the opening (Z in the cloth-clamp slide. Hence, when the parts are in workin g position, under the rotary motion of the cam-wheel b5 the lever Z111 will be swung back and forth in the horizontal plane and will impart a similar swinging motion to the cloth-clamp (Z2 and the forward end of the cloth-clamp slide d. In this swinging motion of the cloth-clamp (Z2 and the forward end of the slide d the clampin g-plate e will also swing at its forward end with the cloth-clamp slide d and both will turn on the pivot-screw d as their fulcrum. The extent of throw given to the cloth-clamp (Z2 in its lateral swinging motion is determined by the position of the cross-head slide b14 on the cam-lever Z111. If this cross-head Z114 be at its outermost limit on the lever Z211, the full stroke of the lever ZJ11 will be imparted to the clothcla-mp d2; but if the said cross-head Z211 be in any other position nearer to the pivoted end of the said lever Z211 the lateral stroke or throw of the cloth-clamp Z2 will be correspondingly decreased.

Having regard new to the sliding motion or longitudinal feed of the cloth-clamp slide (Z', it may be seen en reference to Fig. 3 that the said slide (Z/ is provided with a vertical lug (ZT. This lug detachably engages with a suitable seat in a nutf, which is mounted on and has screw-threaded engagement with a screw-shaftf". This serew-shaftf/ is mounted in suitable vertical bearing-lugs f2 of a lateral slide-plate f3, which has dovetailed engagement with flange-lugs f4, fixed to or forming a part of the main frame a a. 'lhe .forward end of the screw-shaftj" is provided with a beveled pinion f5, which maybe made to engage with either one of the beveled gea-rwheels bS on the shaft Z) and cam-wheel b5 or he thrown into an idle position, where it will be out of gear with either of said wheels Zig. It is therefore, of course, obvious that the said screw-shaft f will be turned in one or the other direction, according to which one of the said beveled gear-wheels Z18 the said beveled pinion f5 is made to engage. The laterally-movable slide f3, on which the said serew-shaftf is mounted, is under the control of a pivoted cam-action shipper-lever f, This lever is pivoted to the bed-plate a, as shown at f7, and is provided with a cam-slot f, which is engaged by a stud fm, rising from the said laterally-movable slide-plate f. In virtue of the relation of the cam-slot f and the stud f1O the said plate f3 may be shifted by operating the pivoted lever f, so as to stand in either one of its extreme positions or in its intermediate and idle position. The said lever f is provided with a pair of projections or cam-tips f 11, one or the other of which will be in the path of the traveling nut j" whenever the pinion is in engagement with either of the beveled gears Zig.

It should have been noted that the screwshaft f is held against longitudinal movement and that the nut f travels lengthwise of the shaft f through a slot f1? in the slideplate f3. Hence whenever the nut ji reaches the limit of its travel in either direction on the shaft f it will have engaged one or the other of the cam-tips f11 on the lever f and have rocked the said lever into its opposite extreme position, which movement of the said lever f will move the slide-plate f3 from one to the other extreme of its lateral movement, and thereby shift the pinion f5 from one to the other of the said beveled gears Z;8 andreverse the direction of the travel of the nutf and the cloth-clamp slide (Z. 'lhe longitudinal feed of the cloth-clamp slide d' and its reversal in direction is, therefore, automatic. The lever]CG is, however, capable of hand action, so as to permit the longitudinal feed of the cloth-clamp to be reversed at any intermediate point and permit the slide-plate j to be thrown into position to render the pinion f5 idle or out of gear with either of the beveled gear-wheels bs. ln beth directions of the cloth-clamp slidcs travel the oscillatory or laterally-swinging motion of the clothclamp (Z2 will be maintained under the action of the cam-channel Z1" of the wheel Z1, the cam-lever Z111, and cross-head D11.

A flat spring g is shown as fixed to the forward part of the frame and as bearing at its free end against the continuous peripheral portion of the cam-wheel Zr", and serves to operate as a check-brake to prevent the backward movement of the said cam-wheel.

From the foregoing detailed description it is thought that the construction and operation of this device must be clear and distinct. It will, of course, be understood that when this device is applied to the sewing-machine a cover is placed over the ordinary cloth-feed of the sewing-machine and the ordinary presser-foot is removed.

The device, as described, will produce an even stitch; but by placing a thread or cord IOO IIO

at the side of the needle and holding the same in such a way that it will shift laterally with the cloth-clamp, so that the needle will make its downstroke on opposite sides of the cord alternately, a raised tack may be producedl whenever so desired.

My device herein disclosed is, as must be apparent from the description, of extremely simple construction for the purposes had in view. v It should also be especially noted that in view of the fact that the casing a for the cam-wheel b5, beveled gear-wheels bs, and the pinion f5 is formed integral with or secured to the bed a, it protects the parts which require the most oil from dust and dirt and shields the cloth and the operator completely from the oil, which would be otherwise liable to escape from the rotary cam-wheel, beveled gears, and pinion. This form of frame also protects the working parts in such a way that they are not liable to injury from handling and knocking around under rough usage.

It should be especially noticed in regard to the action of this device that when in working position it is rigidly secured to the presser-foot bar of the sewing-machine, and hence the attachment is movable up and down with the presser-foot bar, thereby affording clearance for the free manipulation of the cloth in the same way as under the ordinary action of the sewing-machine.

Vhat I claim, and desire to secure byLetters Patent of the United States, is as follows:

l. In a sewing machine attachment, the combination with the cloth clamp slide, of the pair of bevel gears receiving motion from the needle-bar, a shiftable screw-shaft having a pinion engageable with either of said bevelgears, a traveling nut on said shaft connected with said cloth clamp slide, and a shifting device for shifting said screw-shaft, substantially as described.

2. In a sewing machine attachment, the combination with the cloth clamp slide, of the pair of bevel-gears receiving motion from the needle bar, a shiftable screw-shaft having a pinion engageable with either of said gears, a traveling nut on said screw shaft connected with said cloth clamp slide, and a screw-shaft shifter operated by said traveling nut to alternately shift said pinion from one to the other of said gears, for automatically reversing the feed of the cloth clamp, substantially as described.

3. In a sewing machine attachment, the combination with .the cloth clamp slide, of the pair of bevel-gears receiving motion from the needle-bar, a shiftable screw-shaft having a pinion engageable with either of said gears, a t-raveling nut on said shaft connected with said cloth clamp slide, and a cam action pivoted lever arranged to shift said screw shaft and provided with a pair of tips or projections which are alternately acted upon by said traveling nut, to effect the shift and reverse the feed, substantially as described.

4. The combination with the cloth clamp slide CZ, of the bevel gears 198 receiving motion from the needle-bar, of the lateral slide plate f3, the screw shaft f having the pinion f5, the traveling nut, f, the lug Z7 on said clamp slide engaging said nut, the shifting lever f6 having the cam slot ff and the cam action tips f and the stud flo on the slideplate f3 workin' g in said cam slot fg, substantially as described.

5. In a sewing machine attachment, the

combination with a cloth clamp slide mounted for pivotal and longitudinal movement, of a rotary shaft receiving motion from the needle bar, a cam-wheel on said shaft, a pivoted lever subject to the action of said cam-wheel and connected with said cloth clamp slide, for imparting a lateral swinging motion to said clamp slide, a pair of beveled gears also on said shaft and facing each other, a shiftable screw shaft having a pinion engageable with each of said beveled gears, and a traveling nut on said screw-shaft having a connection with said cloth clamp slide, for impart-ing the longitudinal feed thereto, substantially as described.

6. In a sewing machine attachment, the combination with a suitable fixed frame, securable to the machine, of a cloth clamp slide mounted on said frame, with freedom for longitudinal s'liding motion and lateral swinging motion, a rotary shaft provided with a ratchet, a lever pivoted on said shaft having a pawl engaging with said ratchet and securable to the needle-bar, for turning said shaft with a step-by-step motion, a cam-wheel on said shaft having a peripheral cam-channel, a pivoted cani-lever subject to the action of said cam-wheel, an adjustable cross-head connecting said cam-lever with said cloth clamp slide, for imparting the swinging motion to said slide, a pair of beveled gears on said shaft, a laterally movable slide-plate on said frame, a screw-shaft on said slide-plate having a pinion engageable with either of said beveled gears, atraveling nut on said screw-shaft working through a slot in said plate and engaging a lug on said clamp-slide, for imparting the longitudinal feed thereto anda shifting-lever having a cam slot and stud connection with said plate f3, which lever is capable of hand action and is also provided with cam tips subject to the action of said traveling nut, for shifting said plate and screw shaft either to stop or to reverse the feed of the cloth clamp slide, substantially as described.

JOHN D. SCI-IOONMAKER.

Witnesses B. SOHOONMAKER, S. T. MORGAN, F. P. MACK.

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