US328542A - Chaeles e - Google Patents

Description

(ModeL) 2 Sheets-Sheet 1.

C. E. TIBBLES. FEED MOTION FOR SEWING MACHINES.

No. 328,542. Patented Oct. 20, 1885.

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(ModeL) 2 Sheets-Sheet 2.

G. E. TIBBLES.

FEED MOTION FOR SEWING MACHINES.

No. 328,542. k Patented 0ct. 2 0, 1885.

UNETED STATES ArENr amen.

CHARLES E. TIBBLES, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE TIBBLES MANUFAOTURIN G COMPANY, OF SAME PLACE.

FEED-MOTION FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 328,542, dated October 20, 1885.

Application filed May 14, 1885. Serial No. 165,412.

To aZZ whom it may concern.-

Be it known that 1, CHARLES E. TIBBLEs, of Chicago, in the county of Cook and State of Illinois, have invented certain Improvements in Feed-Motions for Sewing-Machines; and I hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, making part of this specification, in which Figure 1 is a bottom plan view of the bed plate of the machine and attached mechanisms. Fig. 2 is a detail elevation of the stitch-controlling device. Fig. 3 is a side elevation of the feed-bar, feed-points, and raising and lowering cam, the driving-shaft being in section. Fig. 4 is a bottom plan of the feed-bar, its fastenings, and driving-shaft. Fig. 5 is a side elevation of the bar and cam for working the lever that reciprocates the feed-bar. Fig. 6 is a plan of the same bar shown in Fig. 5, and a sectional view of the mechanism to change the throw of the cam that operates the bar. Fig. 7 is an end view of a sleeve on the drivingshaft provided with a pin to change the set of the cam which reciprocates the feedbar. Fig. 8 is an end view of the hub on the cam to reciprocate the feed-bar, and a section through the hub and cam. Fig. 9 is a plan and section of the vibrating lever that moves the feed-bar. Fig. 10 shows details to be referred to.

The object of my invention is to provide a feed-motion for sewing-machines which can be set to feed the work both to and from the operator atwill, and will also feed the work always from the operator, regardless of which way the driving-wheel may be turned.

My invention also has for its object to take up and compensate for all lost motion produced by wear between the working parts of the feed-motion.

My invention consists in various details of construction and combinations of devices, as hereinafter fully described, and specifically pointed out in the claims, being improvements on the invention described and claimed in my application filed March 11, 1884, and bearing Serial No. 123,834.

(ModeL) In order that those skilled in the art may make and use my invention, I will proceed to describe the exact manner in which I have carried it out.

In the said drawings, A is the bed-plate of the machine, and B is the drivingshaft. On the driving-shaft, by means of set-screw 2, is adjustably secured a sleeve, B, through which passes a plunger or pin, 1/, having a short rectangular arm, 11, on its outer or protruding end to engage in notches n n, of different 6 depths, and retract the pin against spring a when desirable, for a purpose hereinafter set out.

On driving-shaft B, adjacent to sleeve 13', is the cam e, which through intermediate con- 6 nections reciprocates the feed-bar. This cam is provided with a cylindrical hub, c, the end of which is cut away to a short depth around one-half of the face, forming a deprcssion,e, having at one end the semicircular shoulder e, and at the other end a hole, 2/, of a proper size to receive and engage with the inner end of pin 1/, whereby the hub and attached cam and sleeve 13 may be locked together, for a purpose hereinafter set out.

The cam 6 lies between two downwardly projecting adjustable arms, a c, secured to a pitman-bar, E,which passes on one side of the shaft without touching it, against which arms said cam strikes to move bar E back and forth, neither bar nor cam contacts 0 a touching the shaft proper. The arms 0 have rectangular slotted heads 0, through the slots of which pass screws securing the arms to bar E, and the slots afford a ready means of setting up the arms to the cam to compensate for wear.

The bar E has one end sustained in a boX, e secured to the bed-plate, said box having a central adj ustingscrew, 6 which bears against an interior loose flat gib or plate, 6, c on which rests the end of bar E, the feeding forward of the screw 6 serving to push the gib against the bar E and bring it to a hearing in order to compensate for wear. The

other end of bar E rests on the top of one end 5 of the vibrating lever H, and engages with it by means of stud h and hole h, the other end of said lever H being provided with a slot, If,

crum consists of a box, I, which straddlesbar- G and fits exactly over the edges of lever H,

the said box being secured to bar G by means of a headed screw, 2', about which the box vibrates.

Interposed between-bar G and lever H is a gib, '6, against the lower side of which bears a screw, '13, which passes through the center of screw 6, tapped for that purpose, and is provided with a jam-nut. Turning screw 0; inward forces gib 6 against lever H, and always brings it up so as to make the bearing perfect, and thereby compensates for wear.

The change in the position of the movable fulcrum by the longitudinal movement of the bar G determines the length of the throw of the feed-bar, and consequently the length of the stitch, after the well-known manner in such devices, with the exception that at the longest throw of the feed-bar the movable fulcrum is at the center of the lever H, so that, whatever be the length of stitch, I at all times maintain a powerful leverage to throw the feed-bar.

The feed-bar F is sustained and slides in rectangular supports or hangers f, secured to therace-rib by headed screws passing through slots 4 4, the slots enabling a ready adjustment of the bearings of the feed-bar against the rib, while gibs 5 5, inserted between the hangers and the lower face of the feed-bar and set up by screws 6 6, allow a vertical adjustment of,

the feed-bar to take up lost motion or for other purposes.

The feed-points F are secured to a sliding block, F which moves independently in ver-} tical ways 7 7 in the feed-bar, and is actuated In a recess in, block F is a movable contact, f, for cam fj to strike, controlled by a screw, 1, to feed it by cam f on the driving-shaft.

downward in order to take up lost motion.

It will be observed that in so far as the pitman-bar E is concerned it has no direct contact with the driving-shaft, and cam e only touches the arms 0 0, thereby avoiding any be used on the shaft for the same purpose without departing from the vention.

It is obvious that the sleeveB may be made integral with the driving-shaft without departing from the spirit of my invention, and

spirit of my inat right angles to the center radius of the working-arc of the lifting and depressing cam f. In this position the cams will feed the goods in time toward the operator, when the driving-wheel is thrown toward the operator and feed the goods in time from the operator, when the driving-wheel is turned from the operator.

When it is desired to always feed the goods from the operator, regardless of the direction of the rotation of the driving-shaft, the pin b is withdrawn from hole I), and lever 12 is turned into the shallower notch n, leaving the inner end of the pin 12' projecting into the depression 6, so that hub e can move freelyin either direction one-half a revolution, until it brings up either against shoulder 6 or the shoulder e at hole b. When the driving-shaft is now turned in one direction, the 9 'tion, the friction checks cam e for half a revolution, until the end of the pin b strikes the shoulder c at hole b, and carries said cam along,quartering in the opposite direction from that maintained while the pin was against shoulder 6', and also quartering exactly across cam f, and in a position consequently to still feed the work from the operator in time.

Having thus described my invention, what I claim as'new, and desire to secure by Letters Patent, is-

1. In a feed mechanism for sewing-machines, the feed-bar F, and cam e, for reciprocating the feed-bar, having hole b and semicircular depression e, in combination with the stationary sleeve B, provided with movable pin 12, and the driving-shaft B, substantially as described.

2. The stitch-regulating bar G and vibrating lever H, in combination with box I, flat gib 11, screw '5, and screw 13, passing through screw i and abutting against gib i", all constructed, arranged, and operated as described.

3. The driving-shaft B, sleeve B, provided with notches a n spring-pin b, cam 6, provided with hole I) and depression (2, pitman-rod E, having adjustable contact-arms c c, vibrating lever H, provided with a movablefulcrum feed-bar, F, and stitch-regulating bar F, and operating mechanism connecting the G, all constructed, arranged, and operated as feed-bar and pitman-bar E, substantially as 10 set forth. set forth.

4. In asewing-machine feed mechanism, the pitman-bar E and devices to support it en- CHARLES TIBBLES' tirely free of the driving-shaft, in combination Witnesses: with two laterally-adjustable contact-arms,c F. D. ELLSWORTH,

a, cam e, to reciprocate the feed-bar, feed-bar F. B. EVANS.

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