US1232091A - Feeding mechanism for sewing-machines. - Google Patents

Description

I. C. RINGE.

FEEDING MECHANISM FOR SIEWING MACHINES.

APPLICATION FILED FEB. 27, I915.

Patented July 3, 1917.

ammun- ATTORNEY Jam; 07772 5.

WITNESSES."

STATES JOHN c. HINGE, on iartrnenronr, CONNECTICUT, AssieNon To Tran SINGER MANUFAC- I r ItING COMPANY, n CoRPoRA'rIoN or NEW JERSEY.

FEEDING MECHANISM FOR SEWING-MACHINES.

Specification oflLetters Patent,

Patented July 3,1917.

Application filed February 27, 1915. Serial No. 10,899.

H t l. feedlng mechanisms for-sewing machmes and has for itsobject to better adapt a needle feed and complemental under fourmotion feeding mechanism to the requirements of multiple needle sewing machines.

In the manufacture of mens, womens and childrens garments it is common to employ multiple needle sewing machines,and the uniting of superposed pli'esof fabrics it is preferable to use the variety of machine ems ploying aneedle feed cooperatingwith an under feed-dog provided with needle openings to better insure a uniform travel of the upper and under lying plies, and frequently it happens that one ofthe seams is arranged close to the free edges of the fabrics and when this occurs the opening in the needleplate for the section of feed-dog cooperating with the edge stitching needle leaves the free edges unsupported when the feed-dog is moved below the upper surface of'the needle plate, and when stitching comparatively thin fabrics the action of the take-up, when setting or tightening the stitch, tends to slightly pucker or pull the fabrics 111 line with the edge seam.

To overcome the difliculty above pointed out and retain substantially all of the advantages incident to the employment of an under four-motion and needle feeding mechanism, one of the serrated sections of the feed-dog is dispensed with, this effecting a needle feed for theedge seam and a combined needle and four-motion feed for the others of the seams.

In the accompanying drawings which form a part of the specification, Figure 1 is a front end elevation of one form of commonly employed sewing machine equipped with the present invention. Fig. 2, a plan of the front end portion of the bed-plate shown in Fig. 1, the front and back slide plates being omitted to expose to view the loop-takers. Fig. 3, a plan view of the throat or needle-plate, feed-dog and needles,

- the latter shown in section and together with the feed-clog in position to commence the feeding operation. Fig. 4, a view similar to Fig. 3, except that the feed-clog and needles are at their limit of feed movement. Fig. 5,

one form of product illustrating the application ofthe present invention.

The invention is herein shown and will be described as applied to a Singer sewing machine equipped with an upper needle feed cooperating, while the needles are in the fabrics, with an under four-motion feed-dog provided with needle openings the means for giving to the needles their feed move ments being the same as is illustrated and described in U. S. Patent No. 929,7 61, August 3, 1909,. to C. F. Gray and may be as therein pointed out or of any approved form of construction.

Referring to the figures, 1 represents a sewing machine bed-plate upon which is mounted the arm standard 2 provided with the usual bracket-arm (not shown) carrying the head 3, 4 the band wheel, 5 the thread tension, 6 the take-up pivoted upon a stationary part of a sewing machine and operatively connected with thelink-stud 7 carried by the shaft flange 8 secured upon the main or needle-bar driving shaft (not shown) common to machines of the present variety. 9 denotes a spring-pressed clothpresser car- "rying bar provided with a cloth-presser l0 and lifting lug 11, the latter cooperating with a lifting lever 12 to raise and hold the cloth-presser in its elevated position.

13 represents the needle-bar into which are suitably secured the needles 14 and 15, said needle-bar being mounted to move vertically in and laterally with the swinging frame 16 pivoted at 17 to the head 3, and operatively connected with the shaft flange 8 by stud 7, link 18 and needle-bar studcollar 19, the frame 16 being given its lateral movements through the oscillating shaft 20 (shown in dotted lines only and corresponding to and operating in the same manner as the rock-shaft 65 of Patent No. 929,761 previously referred to), and crank-arm 21 whose free end tracks the groove 22 formed in the lower end of said frame.

23 and 24 represent the right and left hand loop-takers respectively, each provided with a thread-bobbin, as 25, and carried by suitable shafts, as 26, provided with spiral gears, as 27, (one only of said shafts and gears being shown, Fig. 1), said spiral gears meshing wlth gears, as 28, of double ratlo carried by the loop-taker actuating shaft 29,

of the sewing machine, for effecting the feed movements of the feed-dog, the eccentric I 33, through the yoke 34 secured by screw 35 to the rear end of said feed-dog carrying bar acting to give to said feed-dog its vertical movements. 36 denotes the needle or throat plate provided with openings 37 and 38 for the serrated portions 39 and 40 re spectively, of the feed-dog, 41 a needle opening in the serrated portion 39 of the feeddog, 42 a like opening in the needle-plate, and 43 an opening in the latter through which passes the commonly employed needle-plate screw (not shown) threaded into the bed-plate.

In the operation of the machine, for eifecting the product represented by Fig. 5, the fabric 44 is passed through the folding scroll 4:5 ofthe edge folder 46, the folded tape or stay47 being passed from the supply through suitable guiding elements (not shown) to and beneath the presser-foot 10, the outer edge 48 of the tape and the folded edge 49' of the fabric being guided to the action of the stitch-forming mechanism by the edge guide 50, the latteracting to direct the fabric in a line to insure that the seam 51 will follow the edges 4-8 and 4L9 as close as the stitching operation will permit, and to effect such edge seams without distorting either of the fabrics is the purpose of the small needle opening 15, and to insure that the feed movements of the separate plies will a be uniform or of like amplitude is the purpose of the. needle feed and the housing of one of said needles in the opening 41 in the feed-dog thus effecting a seam close to the free edges'of the fabric without distorting the latter and the stitching of parallel seamswithout danger of giving to certain of the plies feed movements differing in amplitude from others of the plies.

Having thus set forth the nature of the invention, what I claim herein is In a stitch-forming and cloth-feeding mechanism for sewing machines, the combination with means for supporting the fabric, multiple loop-takers, multiple needles oooperating with the latter for effecting an edge-seam and a parallel inner seam and means for giving to said needles feed movements, of an under feeding mechanism arranged atone side only of said edge seaming needle and in position to cooperate with the feed. movements of the other of said needles.

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

JOHN G. RINGE.

Copies of this patent may be obtained for five cents each, by addressing 'thercommissioner of Patents,

Washington, D. 0. I v

Images