US1191089A - Feeding mechanism for sewing-machines. - Google Patents

Description

r G. E. MOLYNEUX.

FEEDING MECHANISM FOR SEWING MACHINES. nrucmon FILED, me. 26. 1914.

1,191,089 Patented July 11, 1916.

WITNESSES. 22;; .1

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GEORGE E. MOLYNEUX,

' menace.

.; in en 0F BAYONNE, NEW JERSEY, ASSIGNOR TO THE SINGER, MANU- FACTURING COMPANY, A CORPORATION OF NEW JERSEY.

FEEDING MECHANISM FOR SEWING-MACHINES.

- Specification of Letters Tatent. Patented July 11 1916 Application filed January 26, 1914. Serial No. 814,291.

new and useful Improvements in Feeding Mechanisms for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention has for its object to provide asimple, strong and effective feeding mechanism for sewing machines, and more particularly for sewing machines of that type employing'a tubular work-supporting arm upon which the work is caused to travel lengthwise in the stitching operation.

Inits preferred form, the invention comprises a feed-bar extending longitudlnally of the work-supporting arm and having a yoke or I and embracing the'feed-actuating eccentric upon the main-shaft by which one end, of the feed-bar is confined to a fixed path of movement including its endwise operative or feeding movement, in conjunction with lifting means disposed within said arm and having an independent connection with said shaft. By this means, the feed-bar derives its endwise or work-advancing movements directly from the main-shaft which affords,

a support for its adjacent end,'a second support near the feed-dog mounted thereon 1mparting to it its rising and falling move-.

ments. The lifting means are preferably connected with the feed-bar 'at'a fixed dis tance from the main-shaft and by means of a sliding and pivotal j oint,"so'.that the feeding and rising and falling movements are entirely independent of each other.

In the accompanying drawings, Figure 1" is a sectional side elevation ofa cylinderbed sewing machine of the well; known Singer type embodying the present improvements, and Fig. 2 a sectional plan of the hollow standard and tubular work-supporting arm with the parts contained therein. Fig. 3 is a perspective view of the feeding mechanism and certain other operative parts, detached.

The frame is composed of the usual hollow standard 1 to which is secured by screws 2 the end flange 3 of the tubular work-supporting arm or horn 1, the standard having strap rigidly connected therewith extended from its upper end the overhanging tubular members 5 terminating in the hollow head 6. J ournaled within and cross wise of the standard 1 of the arm 4 is the main-shaft 7 which is provided with the needle-actuating crank 8, thread-controller actuating eccentric 9, looper, rock-shaft actuating eccentrics 10 and '11, feed-actuating eccentric 12 and feed-lift eccentric 13.

The needle-bar 14 carrying the needle15 derives its operative movements from the crank 8 through the pitman'16,crank-arm 17 on the rock-shaft 18 and crank-arm 19 on said rock-shaft connected with thoneedlebar by means of the link 20 in a manner well known. The'looper-carrier 21 carryingthe looper 22 is pivotally mounted upon the looper-supporting rock-shaft 23 j ournaled within and axially of the work-supporting arm and deriving its rocking movements from the eccentric 10, through the eccentric rod 24:, plural-armed rocker 25 and link c0nnection 26 with the crank 27 upon said rockshaft, as shown and described more fully in my Patent No. 1,127,069, issued February 2, 1915. The sidewise movements of the looper are derived fromthe eccentric 11 through the eccentric rod 28 pivotally connected with the endwise movable bar 29 journaled within the arm 4 beneath the looper-supportingrock-shaft and. having a sliding and pivotal connection with the looper-carrier similarly to that-of my said patent.

As respre'sented in the drawings, the feedbar 30' has secured uponits threaded rearward end the split yoke or strap 31 embracing the feed-actuating eccentric 12 and de riving therefrom circularv movements in a fixed path, which movement's'are communicated to the adjacent end of the feedbar in operative endwise .or work-advancing movementsand transverse movements. The feedbar extends within and lengthwise of the 35 from endwise 40 other types of feed actuation.

5 portion of the feed-bar, is shown formed with a transverse. rectangular slideway 39 arranged lengthwise thereof in which is fitted the slide-block 40 pivotally sustained by the screw-pin 41 between the spaced lugs 42 of the forked arm 43 of a rock-lever having its apertured hubs 44 entered by the transverse journal-pins 45 tapped into the arm 4 and provided with a rearwardly extending arm 46. The rearward end of the rock-lever arm 46 carries a stud-pin 47 em braced by the apertured end of the rod 48 prbvided with the eccentric strap 49 embracing the feed-lift eccentric 13.

The means employed in connection with the present improvement for adjusting the throw of the feed-actuating eccentric is preferably that of my Patent No. 1,146,437, issued July 13, 1915, the eccentric being controlled in its lateral position upon the shaft by means of the peripherally notched disk member 50.

By the use of a crank or eccentric upon the main-shaft embraced by a strap having a rigid connection with the feed-bar, a peripherally continuous bearing contact is produced between the operative parts which provides ample bearing surface to insure durability' and to exclude grit or other injurious matter, while the feed-bar receives there-' reciprocating movements whose gradual reversal is free from shock owing to the circular movement of which it is one of the component elements, therebypreventing the noise produced with certain Owing to the pivotal support of the feedbar within the work-supporting arm at a point near the opposite end of the feed-bar, the crosswise movement of the latter derived from the feed-actuating eccentric is so slight in its effect upon the feed-dog as to be negligible, while the connection of the lifting means with the feed-bar is sufliciently close to the feed-dog to prevent the appreciable spring- 50 ing of the feed-bar under the action of the strongest pressures applied by the pressure spring 51 to the presser-foot 52 through the presser-bar 53. This relation of the parts permits the employment of independent means for imparting endwise feeding and rising and falling movements to the feedbar, so that adjustments may be made in the length of feed without appreciably aflecting the amplitude of the vertical movements of the feed-dog. c

It is obvious that the present improvement, while designed especially for the cylinder-bed type of machines, is adapted for other types, and that the construction and arrangement of its component elements may be considerably varied within the scope of the present invention.

Having thus set forth the nature of the invention, what T claim herein is In a sewing machine, the combination with the frame comprising a hollow standard and a tubular work-supporting arm extending laterally therefrom, of a rotary shaft mount ed within said standard and transversely thereof and of said work-supporting arm, feedactuating and-lifting eccentric elements upon said shaft, a feed-bar extending through said arm and having at one end a strap embracing the feed-actuating eccentric element, a feed-dog mounted upon the opposite end of said feed-bar, a rock-lever mounted upon a fixed fulcrum within and transverse to said work-supporting arm, and having an arm extending lengthwise of said feed-bar, a rectilinearly sliding connection between said arm of the rock-lever and the feed-bar and disposed intermediate said transverse fulcrum and the feed-dog, and a link connection within said standard at one end with another arm of said rock-lever and provided at the opposite end with a strap embracing the feed-lifting eccentric.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

HENRY J. MILLER, HENRY A. KORNEMANN, Jr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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