US400833A

US400833A - Union

Info

Publication number: US400833A
Authority: US
Publication date: 1889-04-02
Anticipated expiration: 1906-04-02

Description

Patented Apr. .2 1889,.

INVENTOR Q WITNESSm (W. 040, 39- ZZJQQMi N. PEYERs, PhofloLlthugmpher. Washin ton. D. C.

UNITED STATES PATENT OFFICE.

JOHN IN. DEWVEES, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE UNION SPECIAL SEl VING MACHINE COMPANY, OF CHICAGO, ILLINOIS.

FEED MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent N0. 400,833, dated April 2, 1889. Application filed April 2'7, 1888. Serial No. 272,040. (No model.)

To a whom it may concern."

Be it known that I, JOHN WV. DEWEEs, of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Feed Mechanism for Sewing- Machines, whereof the following is a specification, reference being had to the accompanying drawings.

In said drawings, Figure 1 is a partial end elevation of a sewing-machine embodying my invention; Fig. 2, a partial top or plan view of the feeding devices, and Fig. 3 a sectional view illustrating details of the adjusting mechanism.

In Letters Patent of the United States, No 299,568, granted to L. lWIuther and R. G. WVoodward, under date of June 3, 1884:, certain de- Vices for actuating the feed are shown and described. Said devices consist, broadly speaking, in an oscillating hinged frame whose movement is the resultant of two independent reciprocating movements, one in a substan-, tially vertical plane, the other in a substantially horizontal one.

My present improvements relate to feeding devices actuated by such oscillating frames, and their object is to produce the required improvements with greater efficiency and to afford a greater range of ready adjustment for varying the extent of the feed while preserving the synchronism of its several motions.

In the accompanying drawings, A represents the workplate of the machine mounted upon the frame or base B, which carries one of the bearings of the main driving-shaft J. A portion of the head of the machine is indicated at D, the needle and presser-bar being shown at E F, respectively. The remaining parts of the stitch-forming mechanism are not shown in detail, as their construction is well understood.

The feed-dog O is attached by means of its downwardly-projecting piece T to the front end of the horizontal arm H, which forms one member of the oscillating frame referred to. Said arm is pivoted at U to the vertical arm G, which forms the other member of said frame, and this latter arm, G, is in turn pivoted to the base of the machine at I.

From the bottom of the horizontal arm H a piece, R, extends downward and forward, so as to embrace between its upper surface and the lower surface of the front end of the arm H the eccentric W, (see the outer circle of dotted lines in Fig. 1,) which is mounted upon the main driving-shaft J immediately beneath the arm H. A piece of sponge, V, or other porous material, is placed in the opening between the piece R and the rear of the eccentric in order to supply lubricant. The pur-6o pose of the eccentric WV is of course to give the vertical reciprocating movement to the horizontal arm H upon its pivot U, and thus far the construction of the device is sub stantially that specified in the patent before referred to.

The portions to which my improvements re late are those which produce the horizontal reciprocating movement, or, in other words, the forward-and backward movement of the feed, as distinguished from its rising-and-falh ing movement.

' Upon the outer end of the shaft J, I mount another eccentric, K, whose greatest radius coincides with that of the eccentric W. eccentric K is provided with a strap or link,

L, the end of the link being pivoted at Q to one of the arms, N, of a bifurcated frame which is pivoted at P to the base-plate of the machine. The other arm, N, of said frame has in it a curved slot, X, in which a pin, 0, slides freely. Upon the vertical arm G of the oscillating feed-frame is pivoted a bar or link,

M, which corresponds in length with the radius of the curved slot X. The pin 0 fits snugly in a hole in the front end of this link M, and by means of a head, S, (see Fig. 3,) and a nut and washer, Y, the pin can be secured at any desired point in the length of the slot X.

The operation of the device is as follows: The arm H of the feed-frame receives its proper rising-and-falling movement from the eccentric W. In the proper relation to this movement the eccentric K, through the link L, rocks the frame composed of the two arms N N, the center of oscillation being, of course, the pivot P. This movement is communicated by means of the link M to the vertical arm G of the feed-frame, and it is rocked backward and forward to produce these movements in roe Said 7 5 the feed-dog C. The arc of reciprocation of the frame N N is of course a constant one; but by securing the pin 0 at different points in the slot X a greater or less throw will be given to the link M, and hence the length of the feed-motion can be varied With the utmost nicety, but Without varying the rise and fall of the feed or the synchronisni of the several movements.

The parts are simply constructed and of great strength, and by reason of the very considerable length of the slot X a great capacity for adjusting is altorded.

Having thus described my invention, I claim In a feed device having an oscillating feedframe composed of vertical and horizontal arms pivoted together, the combination, with said arms, of a pair of eccentrics mounted upon a driving-shaft, the first of said eccentries engaging directly with said horizontal arm,a bifurcated frame pivoted upon an axis parallel to the driving-shaft and having in one of its bifurcations a curvedislot, a link adj ustably secured in said slot and connected With said vertical a m, and a second link and strap connecting the other bifurcation with the second eccentric, substantially as set forth.

J. \V. DEl/VEES. \Vitn esses:

W. H. 130mm, \V. S. NORTH.