US1685436A

US1685436A - Feeding mechanism for sewing machines

Info

Publication number: US1685436A
Application number: US160015A
Authority: US
Inventors: John C Ringe
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1927-01-10
Filing date: 1927-01-10
Publication date: 1928-09-25
Anticipated expiration: 1945-09-25

Description

Sept. 25, 1928. 1,685,436 J. c. RINGE FEEDING MECHANISM FOR SEWING MACHINES Filed Jan 10, 1927 3 Sheets$heet 1 Sept. 25, 1928.

-J. c. RINGE FEEDING MECHANISM FOR SEWING MACHINES Filed Jan. 10, 1927 3 Sheets-Sheet 2 Sept. 25, 1928 1,685,436 J. c. RINGE FEEDING MECHANISM FOR SEWING MACHINES Filed Jan. 10, 1927 3 Shams-Sheet 3 f 7 wiltweugiw 33% Patented Sept. 25, 1928.

UNITED STATES 1,685,436 PATENT OFFICE.

JOHN C. RINGE, OI STRATFORD, CONNECTICUT, ASSIGNOR TO THE SINGER MANUFAC- TUBING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JER- SEY.

FEEDING MECHANISM FOR SEWING MACHINES.

Application filed January 10, 1927.

This invention relates to improvements in feeding mechanisms for sewing machines and has for its object to provide a mechanism of this character which will with greater certainty feed superposed plies of work without distortion past the stitch-forming mechanism of the machine.

It has heretofore been a common practice to provide a feeding mechanism auxiliary to and having differentially timed work-feeding movements with respect to the main feed of the machine, for the purpose of obviating distortion of one of the plies of the work. These so-called differential feeding mechanisms do not however insure a definite relationship between a fulledply of the work and a work-ply superposed upon the fulled ply.

In a preferred embodiment of the present invention, a sewing machine is provided'with differentially feeding main and auxiliary four-motion lower feed-dogs cooperating with which is a needle-feed having work-advancing movements corresponding in ampli tude to those of the main feed-dog. The needle-feed actuating mechanism is so combined with the actuating mechanism of the differentially moving feed-dogs that by a. single adjustment the work-feeding stroke of all three feeding elements may be varied, while a separate adjustment provides means for regulating the feeding movement of the auxiliary feed-dog independently of those of the main feed-dog and the needle-feed.

By means of the present improvement it is therefore possible to feed superposed plies of fabric without relative slippage, due to the combined action of the needle-feed and the main feed-dog, while distortion of the lower ply of the work is prevented by the fulling action of the differentially timed auxiliary feeddo I n the accompanying drawings, Fig. 1 is a longitudinal section of a sewing machine containing a commercial embodiment of the invention. Fig. 2 is a bottom plan of the sewing machine illustrated in Fig. 1. Fig. 3 is a transverse section substantially on the line 33 of Fig. 2, omitting the loop-taker mechanism. Fig. 4 is a perspective view, partly in section, of the feed-actuating mechanism detached. Fig. 5 is adetail elevation of the adjustable feed-eccentric support.

. Referring to the drawings, the sewing ma.- chine comprises the usual bed-plate 1, from which rises the hollow standard 2 of the over Serial No. 160,015.

lower end the needle-bar carries the spaced needles 12.

The needle-bar 11 is journaled for endwise reciprocation in alined bearing apertures provided in the spaced

lugs

13 and 14 of the vibratory frame 15 pivotally supported at its upper end upon the pin 16' fixed in the head 4, whereby the frame 15 is confined to swinging movements in a vertical plane transverse to the length 'of the main-shaft 5.

Secured upon the main-shaft 5 is the beltpulley 17 connected by means of the belt 18 with the pulley 19 secured upon the looptaker actuating shaft 20 journaled in suitable bearings provided below the bed-plate 1, the

pulleys

17 and 19 being of equal size whereb one to one rotations are imparted to the sha 20 from the main-shaft 5. The loop-taker actuating shaft 20 carries spaced spiral gears 21 each meshing with a similar gear 22 fixed upon a vertical looptaker shaft 23, which loop-taker shafts 23 each carry a loop-taker 24 of any suitable or well known vertical-axis type for cooperation with the needles 12 in the formation of lock-stitches. The ratio of the gears 21 and 22 is such. that two rotations are imparted to the loop-takers 24 for each rotation of the actuating shaft 20.

Referring now more particularly to the present improved feeding mechanism, a main feed-dog 25 is secured by screws, as 26, upon a main feed-bar 27 receiving rising and falling movements from afeed-lift eccentric 28 100 upon the shaft 20, said eccentric being dis-- posed Within a fork 29 secured for vertical adjustment upon the feed-bar b means of a screw 30 passing through an e ongated slot 31 provided in a lug 32 depending from the 105 arms 35 on one end of a feed-actuating rock- 11 Lil shaft 36. Suitably secured to the opposite end of the rock-shaft 36 is the hub of a lateral arm 37 pivotally connected by means of a bolt 38 to the apertured lower end of a pitman 39 of which the upper end is formed as a strap embracing an eccentric 40. The eccentric 40 has an enlarged shaft aperture 41 and is formed integral with the eccentric-frame 42, which may be adjusted with respect to a disk 43 secured upon the shaft 5 to vary the throw of the eccentric. This adjustment may be effected by means of a knurled nut 44 at the outer end of the main-shaft 5 and in a manner substantially as disclosedin the pat-v ent to Dial et al., No. 718,988, Jan. 27, 1903, which eccentric adjustment is so well known in the art as to herein require no further de scription.

The bolt 38 also constitutes a pivotal con nection between the pitman 39 and the lower end of a link 45 of which the upper end is pivotally fconnected, by means of a bolt 46, to an arm 47 suit-ably fixed upon a needlevibrating shaft 48. The shaft 48 is journaled for oscillation in bearings provided in the bracket-arm 3, said shaft 48 being disposed substantially parallel to the main-shaft 5 and carrying at its forward end a bent crank-arm 49 suitably connected with the lower lug 14 of the needle vibrating frame 15. The described connections for vibrating the frame 15 are so proportioned that the lateral movements of the needles 12 correspond inamplitude to the feeding movements of the feeddog 25. As will be observed more particularly in Fig. 4, the feed-dog 25 is provided with apertures 50 entered by the needles 12 during the feeding movement thereof. It

- will therefore be understood thatthe needles for the main feed-dog actuating shaft 36,

said shaft 56 being journaled for rocking movements in suitable bearings provided in

lugs

57 and 58 at the under side of the bedplate 1. At its forward end, the shaft 56 is provided with spaced upstanding arms 59, between the free ends of which is pivotally mounted the transversely apertured boss of an auxiliary feed-bar 60. Secured upon the feed-bar 60 by screws as 61 is an auxiliary feed-dog 62 disposed in advance of the main feed-dog 25, said feed-bar 60 receiving rising and falling movements from the feed-lift eccentric 28 by means of a fork 63 embracing said eccentric. The fork 63 is secured upon the feed-bar 60 by means of a screw 64 and preferably for vertical adjustment of the feed-bar with respect thereto in the same manner as in the securing means for the fork 29.

The feed-dogs 25 and 62 operate as usual in suitable slots provided in the throat-plate 65 secured upon the bed-plate 1, said feeddogs being opposed during the feeding movements thereof by the usual presserfoot 66. I

From the foregoing description, it will be evident that the work-feeding movements of the needles 12 and the feed-dogs 25 and 62 may be simultaneously adjusted by the single adjustment of the eccentric 40, while the working stroke of the auxiliary feed-dog 62 may beseparately adjusted for differential work-feeding movements with respect to the unison feed of the other feeding elements. Consequently one of the work plies may be fulled the required extentfor different materials being operated upon, regardless of the stitch-length selected, while the superposed plies of material are with certainty fed without relative slippage past the stitch-forming mechanism of the machine, by the unison feed of the needles 12 and the main feeddog 25.

Having thus set forth the nature of the invention, what I claim herein is:

1. Feeding mechanism for sewing machines comprising, in combination, .an' endwise reciprocatory needle, means for imparting lateral work-feeding movements to said needle, a main feed-dog having work-feeding movements at one side of the work in unison with the feeding movements of said needle, operative connections for actuating said main feeddog, an auxiliary feed-dog having work feeding movements at the same side of the work as the main feed-dog, and means for actuating said auxiliary feed-dog in differential relationship with respect to said main feed-dog and needle-feed.

2. Feeding mechanism for sewing machines comprising, in combination, an end- Wise reciprocatory needle, means for imparting lateral work-feeding movements to said needle, a four-motion main feed-dog disposed below the work having work-feeding movements in unison with the feeding movements of said needle, operative connections for actuating said main feed-dog, an auxiliary feeddog disposed in advance of said main feeddog, and means for actuating said auxiliary feed-dog in differential relatipnshipwith respect to said main feed-dog.

3. Feeding mechanism for sewing machines comprising, in combination, an endwise reciprocatory needle, four-motion main and auxiliary feed-dogs, means for imparting unison rising and falling movements to said feed-dogs, means for imparting differential work feeding movements to said feed dogs, and operative connections transmitting lateral work feeding movements to said needle in unison with the Work feeding movements of one of said feed-dogs.

a. Feeding mechanism for sewing machines comprising, in combination, an endwise reciprocatory needle, means for imparting lateral work-feeding movements to said needle, a main feed-dog having work-feeding movements at one side of the work in unison with the feeding movements of said needle, operative connections for actuating said main feed-dog, an auxiliary feed-dog having work feeding movements at the same side of the work as the main feed-dog, means for actuating said auxiliary feed-dog in differential relationship with respect to said main feed-dog and needle-feed, and means for simultaneously adjusting the extent of work-feeding movement of the several feeding elements.

5. Feeding mechanism for sewing machines comprising, in combination, an endwise reciprocatory needle, means for imparting lateral work-feeding movements to said needle, a main feed-dog having workfeeding movements at one side of the work in unison with the feeding movements of said needle, operative connections for actuating said main feed-dog, an auxiliary feed-dog 'having Work feeding movements at the same sideof the work as the main feed-dog, means for actuating said auxiliary feed-dog in differential relationship with respect to said main feed-dog and needle-feed, and adjustable means for varying the extent of workfeeding movement of the auxiliary feed-dog with respect to the unison work-feeding movement of the main feed-dog and needle.

6. Feeding mechanism for sewing machines comprising, in combination, an end- Wise reciprocatory needle, means for imparting lateral work-feeding movements to said needle, a main feed-dog having work-feeding movements at one side of the'work in unison with the feeding movements of said needle, operative connectlons for actuatlng sald mam feed-dog, an auxiliary feed-dog having work' and adjustable means for varying the extent of Work-feeding movement of the auxiliary feed-dog with respect to the unison Workfeeding movement of the main feed-dog and needle.

7. In a sewing machine, the combination with a rotary actuating shaft, a reciprocatory needle carrying bar, and means for endwise reciprocating said bar from said shaft, of a needle-feed rock-shaft, operative connections between the needle feed rock-shaft and the needle-bar for imparting lateral workfeeding movements to the needle carried by said bar, main and auxiliary feed-dog carrying bars, a feed-actuating rock-shaft for each of said bars, an eccentric and pitman connection for rocking a feed-actuating rock-shaft from said rotary shaft, means for transmitting the actuating movements of said pitman to the needle-feed rock-shaft and to the other feed-actuating rock-shaft, and means for raising and lowering said feed-bars.

8. In a sewing machine, the combination with a rotary actuating shaft, a reciprocatory needle-carrying bar, and means for endwise reciprocating said bar from said shaft, of a needle-feed rock-shaft, concentrically j ournaled main and auxiliary feed-dog actuating fock-shafts, a crank-arm carried by each of said rock-shafts, an eccentric and pitman connection between said rotary shaft and the crank-arm of the main feed-dog actuating rock-shaft, means for transmitting the actuating movements of said pitman to the needle-feed rock-shaft crank-arm, a link connection with the crank-arm of said needlefeed rock-shaft, and an adjustable connection between said link and the crank-arm of the auxiliary feed-dog actuating rock-shaft.

In testimony whereof I have signed my name to this specification.

JOHN C. RINGE.