US1356938A - Feeding mechanism for sewing-machines - Google Patents

Description

G. E. MOLYNEUX. FEEDING MECHANISM FOR SEWING MACHINES. APPLICATION FILED MAR. 24. 1913.

1,356,938. H Patented Oct 26,1920.

IN VEN TOR ,4 TTORNEY UNITED STATES PATENT OFFICE.

GEORGE E. MOLYNEUX, 0F BAYONNE, NEW JERSEY, ASSIGNOR TO THE SINGER MANU- FACTURIN G COMPANY, A CORPORATION OF NEW JERSEY.

FEEDING MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Application filed March 24, 1913. Serial No. 756,317.

T 0 all whom it may concern:

Be it known that I, GEORGE E. MOLYNEUX, a citizen of the United States, residing at Bayonne, in the county of Hudson and State of N ewJersey, have invented certain, 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 relates to a feeding mechanism for sewing machines and more particularly to the construction of the feed-dog and throat-plate.

In the work of covering seams it has been the practice to first close the seam by either a through-and-through or overlook stitch, and then to cover the opened out seam upon another machine. When covering light and elastic goods the action of the covering stitch tends to draw or pucker the goods thereby forming a ridge on the upper side of the goods. 'To prevent this it has been the usual practice to run the lower or seamrcovering thread under very loose tension. The present feed-dog and throat-plate has been designed for use, more particularly, for seam covering, the object being to provide a device which shall automatically spread the work before the covering' stitch is made, thereby obviating the objectionable ridge on the upper side of the work. f

The-invention will be understood by reference to the accompanying drawings, in

, which Figure 1 is a side elevation of a feedup-the-arm machine, parts being broken away; Fig. 2 a top view of the throat-plate and feed-dog; Fig.13-a perspective view of the feed-dog and its support; Fig. 4: aperspective view; of one of the movable feeddogs; Fig. 5 a perspective view of thethroatplate; and Fig. 6 a section on the plane 6 6 of Fig.2. Similar reference numerals indicate similar parts in the several views. H

Referring to the drawings, the numeral 1 designates the arm of the machine, 2 the cylinder-bed, 3 the needle-bar, 3, 3 the needles carried thereby, 4: the presser-foot bar, 4; the resser-foot lifter, and '5 the power-shaft. The needlesB, 3, are adapted to cooperate as usual with the well-known covering thread-handling element or looper 3*. These parts are, all of usual and wellknown construction, My improved feeddog comprises a shank 6 secured to the carnor 7 by a screw passing through anelongated slot 8 in said shank to permit of proper adjustment on the carrier. The

'shank6 is formed with a T-head 9 having a lengthwise undercut slot 10 adapted to receive the feed-dog sections and to hold them Patented Oct. 26, 1920.

against longitudinal movement independently of the shank.v The feeding surfaces comprise the two outside or auxiliary feeddog sections 11 and 12 each of which has an integral base 13, or a base made in a separate piece and secured to the feeding surface, corresponding, in section, to the undercut slot 10 and freely movable therein lengthwise of the T-head, or laterally of the center line of the cylinder. The outer sections 11 and 12 are set at an angle to their bases so as to diverge outwardly in the direction of the line of stitching, that is, they diverge outwardly from the operator, the angle of divergence of said sections corresponding to the openings 16 and 17 in the throat-plate.

Thedegree of divergence of the feed surfaces 11 and 12, relatively to their bases, may be greater or less than that shown in the drawings, according to the character of the work; as for example with a ribbed fabric sewed lengthwise of the rib or with the Wale, it is desirable that the angle of divergence be greater than when stitching flat knitted fabrics. As seen more particularly in Fig. 2, the teeth of the sections 11 and 12 are cut at right angles to the side walls of the sections and certain of said teeth of each section are disposed in advance of the needles and are thus adapted to act upon and stretch the fabric before it reaches the needles.

Between the end sections 11 and 12 is a main feed-dog section 1 1 shown as having two feeding surfaces although it may be made with a single feed surface, the teeth on 1 said section or sections being at right angles rear of the stitch-forming mechanism and symmetrically with reference to the center line of the throat-plate.

The throat-plate 15, as shown in Figs. 2

and 5, is cut with feed-way. slots 16 and 17 extending from apoint in front of thencedle-holes 15' and diverging outwardly ina direction away from the operator. These slots are adapted to receive the long arm like sections 11 and 12 of the feed dog during their rising and feeding movements. The throat-plate has also a slot or slots 18 to receive the intermediate feeding surfaces 14. i

The carrier 7 is connected through feedlever 19 to a bellcrank 20 which latter receives its motion from an eccentric on the main-shaft 5 to give to the feed-dog its stitch-length movement. An eccentric 21 on the forward end of shaft 5 gives the feedlift movement.

The previously stitched work is guided to the present covering stitch-forming mechanism by means of the usual guide-fin 22 on the presser-foot 23 secured to the presserbar 4:. The guide-fin 22 cooperates in a wellknown manner with the fabric-rib guideway or slot 24 formed in the throat-plate 15 and acts tmguide the initially stitched seam centrally between the needles 3, 3.

In the operation of a machine havii'ig the feed device herein described, the timing of the feed is the same as usual, that is, the feed-dog rises as the needles rise and moves lengthwise of the stitching when the needles are out of the work, the direction being indicated by the arrow at in Fig. 2. As the needles rise, the feed-dog rises in its advance position with the forward ends of sections 11 and 12 in a plane in front of the needles and with certain of the feeding teeth of each auxiliary section in advance of the stitch-forming mechanism; i. e. in advance of a transverse line through the stitching point. lVhen the needles are out of the work, the feed-dog is moved lengthwise of the stitching and as the sections 11 and 1.2 are so moved they are also moved laterally by reason of the divergent feed-way slots 16 and 1'? in the throat-plate. Such lateral movement of sections 11 and 12 will stretch or take. the fullness out of the work, in which stretched condition it is held by the presser-foot when the next succeeding stitch is being made. This stretching action does not extend much beyond the needle-holes for the reason that the seam and covering stitch .are supported upon and fed by the. center or main section 14 of the feed-dog.

While I have described and shown my invention in connection with a machine having a cylindrical arm. it is to be understood that it may be used with a flatbed machine, and that any known form of means for giving the feed-dog its movements may be employed.

Having thus set forth the nature of the invention, what I claim herein is z.-

1. Feeding mechanism for sewing machines comprising, in combination, a feed bar, means for imparting feed-and-return movements to said feed-bar, said feed-bar being provided with a slot extending transversely of the direction of feeding movement thereof, a plurality of feed-dog sections each having a shank slidingly fitted in said slot, and means for moving said sections toward and from each other laterally of the line of stitching.

2. In feeding mechanism for sewing machines, a feed dog comprising two outer sections, an intermediate section, a support for all of said sections in which they are held against independent longitudinal movement, means for imparting feeding movement to said feed-dog and means for moving said outer sections in divergent paths-laterally of the lineof stitching.

3. In feeding mechanism for sewing machines, the combination with a feed-dog comprising two outer sections and an intermediate section, of a support for all of said sections comprising a shank formed with a T-shaped head, said head having an undercut slot adapted to receive the bases of said outer sections and in which said sect-ions are held against longitudinal movement independently of the support, means for imparting feeding movements to the feed-dog, and means for moving said outer sections toward and from each other laterally of the line of stitching.

4. Feeding mechanism for sewing machines comprising, in combination, a feedbar having a transversely extending undercut slot adjacent one end thereof, a feeddog comprising two sections each having a base slidingly fitted within said undercut slot, means for imparting feeding movements to said feed-bar and means for moving said sections toward and from each other laterally of the line of stitching.

5, Feeding mechanism for cylinder-bed sewing machines comprising, in combination, an elongated feed-bar having a transversely extending guideway at its forward end, means for imparting endwise feedand-return movements to said bar, means acting upon said bar intermediate its ends to impart rising-andfallin g movements thereto, a pair of feed-dog sections each having at its rearward end a base snugly fitted to slide along said guideway, the forward ends of said feed-dog sections being free and extending in advanceof said feedbar, and means for moving said feed-dog sections toward and from each other laterally of the line of stitching.

6. A feeding mechanism for cylinder bed sewing machines including, in combination, a feed-bar having a forwardly extemhng free end-portion, two forwardly extending arms each carried by and movably connected at its rear end to the free end-portion of the feed-bar, feeding teeth carried by said arms, and means formoving said arms in opposite directions during the feeding movements of the feed-bar for causing said feeding teeth to stretch the fabric.

7 A feeding mechanism for cylinder bed sewing machines including, in combination, a feed-bar, two arms arranged side-by-side,

said arms being each entirely supported at' one end by said feed-bar for lateral movements relatively to said feed-bar, feeding teeth carried by each of said arms, and

guiding means including guideways adapted GEORGE E. MOLYNEUX.

Witnesses:

HENRY A. KORNEMANN, Jr., WM. P. STEWART.

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