US2114958A

US2114958A - Feeding mechanism for sewing machines

Info

Publication number: US2114958A
Application number: US83440A
Authority: US
Inventors: George A Fleckenstein; Max L Waterman
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1935-06-19
Filing date: 1936-06-04
Publication date: 1938-04-19
Anticipated expiration: 1955-04-19
Also published as: DE672029C

Description

April 938. e. A. FLECKENSTEIN El AL 8 FEEDING MECHANISM FOR SEWING MACHINES 7 Original Filed June 19, 1935 2 Sheets-Sheet l Wness:

MazLJtizier-man April 19, 1938. e. A. FLECKENSTEIN El AL 2,114,953

FEEDING MECHANISM FOR SEWING MACHINES Original Filed June 19, 1935 2 Sheets-Sheet 2 Maw-L. [vizier-man,

WM W;

Patented Apr. '19,

PATENT OFFICE.

amass I 'FEEDI NG MECHANISM FOR SEWING moms George A.- Fleckenstein, Stratford, and Max L. Waterman, Fairiield, Conm, assignors to The Singer Manufacturing. Company, Elizabeth, N. 3., a corporation of-New Jersey originalapplication June 19, 1935, Serial, No.

Divided and this application June 4, 1936, Serial No. 83,440

'1 Claims. (Cl. 112-210) This invention relates to feeding mechanisms for sewing machines and more particularly to a feeding mechanism for high speed lock stitch sewing machines.

One 'of the objects of this invention is to provide an improved form of feeding mechanism which is capable of easy and ready adjustment and which may be operated at high speedswith little vibration and overthrow.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations, and arrangements 'of parts hereinafter set forth and illustrated in the accompanying drawingsof a preferred embodiment of the-invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the drawings:- Figure 1 is a side elevation partly in section, of a sewing machine having our improved feeding mechanism embodied therein.

Figure 2 is a top plan view with the cloth-- plate and bracket-arm removed to disclose the mechanism within the bed.

Figure 3 is an end elevation of the machine looking from the left of Figure 2.

In the embodiment of the invention selected for illustration, l is the trough-shaped bed of the.

machine to which is secured by the screws 2 the standard 2 carrying an overhanging bracket-arm 3 which terminates in a hollow-head 4. Journaled in the spaced bearings 5 and 3 in the over- I hanging arm 3 is a needle-bar driving-shaft I having the usual balance-wheel 8 fixed thereto and journaled in the bearings l3 and It in the bed is a rotary hook-shaft 3 having a rotary hook I5 fixed to one end thereof and fixed to the other end is a pulley l0 which is operatively connected to the pulley H by the clip-belt I2, the ratio being as l is to 2, and, therefore, the hook-shaft 9 makes two complete rotations for each rotation of the needle-bar shaft I. Journaled in the bearings l3 and IT in the bed I is a feed-shaft l3 having a pulley l3 fixed to one of its ends and driven .by means of the clip-belt from the pulley 2! carried by the shaft 1 at the ratio of 1 to 1.

Secured to the end of the feed-shaft l3 extending through the bearing I6 is a feed-lift eccentric 22 and fixed to the shaft l3 on the opposite side of the bearing is an adjustable eccentric 23. The eccentric 23 is the same as that shown in the co-pending patent application of J. H. Stearns, Serial No. 735,612, filed July 1'7,

1934, and which is provided with a notch 24 for the purpose of adjusting the throw of the eccentric. To effect adjustment of the eccentric, there is provided a finger-lever 25 pivoted intermediate its end to the bed I by means of the pivotpin 26. One end ,of the lever is held against lateral movement by a boss 21 formed with an open ended guideway and is provided with a locking nose 28 which is adapted to enter the slot 24 in the eccentric. The other end extends upwardly through an opening in the bed and the lever is normally held in the position shown in Fig. 1 by means of a plunger 29 urged upwardly by a spring 30 located in a boss 3| formed on the bed of the machine. To adjust the stitch-length the operator depresses'the finger-lever 25 and rotates the shaft I8 by turning the balance-wheel 8 until the desired stitch-length is obtained.

The front side. of the bed I, which is nearest the operator, is formed with upstanding bearings 32 and 32" in which is journaled a short shaft 33 having a feed-rocker 34 fixed thereto and is rocked back-and-forth by a pitman 38 having one of its ends secured to the eccentric 23 and its other end secured to a short shaft 35 carried by the feed-rocker. A feed-bar 36, carrying a feeddog 39, bridges the space between the feed-rocker 34 and the feed-shaft l3 and has one of its ends journaled on the short shaft 35 carried by the feed-rocker and its other end overlying a block 31 which cooperates with the feed-lift eccentric 22. The feed-bar 36is formed with a depending portion 40, and secured thereto by the screws 4i is a plate 42 which underlies the eccentric 22.

. 1. A sewing machine having a bed, a horizontally disposed hook-shaft joumaled in said bed,

a rotary hook fixed to one end of said shaft, a rotary feed-shaftjournaled in said bed and arranged parallel to and at one side of said hookshaft, a feed-rocker disposed on the other side of said hook-shaft, means for operatively connect ing said rotary feed-shaft with said feed-rocker,

a feed-bar having one of its ends pivotally connected to said feed-rocker and means actuated by said feed-shaft and operatively connected to the other end of said feed-bar for imparting a rising and falling movement to said feed-bar.

2. A sewing machine having a bed, a horizontally disposed hook-shaft journaled in said bed, a hook fixed to the end of said shaft, a feed-shaft journaled in said bed and arranged parallel to said hook-shaft, a feed-rocker disposed at one side of the hook-shaft, an adjustable eccentric carried by said feed-shaft, means connecting said adjustable eccentric to said feed-rocker, a feedbar having one of its ends pivotally connected to said feed-rocker and bridging the space between the feed-rocker and feed-shaft, and feed-lift means actuated by said feed-shaft and operatively connected to the other end of said feed-bar.

3. A sewing machine having a bed, a horizon tally disposed hook-shaft journaled in said bed, a feed-shaft journaled in said bed and at one side of said hook-shaft, a feed-rocker carried by said bed, a feed-bar having one of its ends pivoted to said feed-rocker and its other end overlying an eccentric carried by said feed-shaft, an adjustable eccentric carried by said feed-shaft, and a pitman for connecting said adjustable eccentric to said feed-rocker.

4. A sewing machine having a bed, a horizontally disposed hook-shaft journaled in said bed, a rotary feed-shaft located in rear of said hookshaft, a feed-rocker journaled at the front of the machine, an eccentric carried by said feed-shaft, a pitman having one of its ends connected to said eccentric and its other end connected to said feedrocker for imparting a back and forth rocking movement to the feed-rocker, a feed-lift eccentric carried by the end of said feed-shaft, and a feed bar operatively associated with said feed-rocker and said feed-lift eccentric.

5. A sewing machine having a bed, a rotary feed-shaft journaled in said bed, an adjustable feed-eccentric carried by said feed-shaft, and means for varying the throw of said feed eccentric, said means including a pivoted lever arranged longitudinally of the bed and having one of its ends in a position to engage said eccentric and its other end extending through an opening in the clothplate.

6. A feeding mechanism for a sewing machine having a bed, comprising a horizontally disposed rotatable hook actuating shaft journaled in said bed, a rotatable feed-actuating shaft journaled in said bed and arranged parallel to and in rear of said hook-actuating shaft, means for rotating said feed-actuating shaft at one-half the speed of the hook-actuating shaft, a feed-rocker journaled at the front of the machine for rocking movement, a feed-bar having one of its ends pivotally connected to said feed-rocker, and means for transmitting operative work-feeding movements to said feed-bar from said feed-shaft including eccentric means actuated by said feed actuating shaft, a pitman connecting said eccentric means to said feed-rocker, and a second eccentric means actuated by said feed-actuating shaft and connected to the other end of said feed-bar.

7. A feeding mechanism for a sewing machine having a bed, comprising a horizontally disposed rotatable hook-actuating shaft journaled in said bed, a rotatable hook secured to the end of said shaft and operable about a horizontal axis, a rotatable feed-actuating shaft journaled in said bed and arranged parallel to and at one side of said hook-actuating shaft, means for actuating said feed-actuating shaft at one-half the speed of the hook-actuating shaft, a feed-rocker carried by said bed and located on the other side of the hookactuating shaft, a feed-bar having one of its ends pivotally connected to said feed-rocker, a feeddog carried by said feed-bar and extending laterally therefrom to a position overlying said hook, and means for transmitting operative work-feeding movements to said feed-bar and feed-dog from said feed-actuating shaft including, eccentric means actuated by said feed-actuating shaft, a pitman connecting said eccentric means to said feed-rocker, and a second eccentric means actuated by said feed-actuating shaft and connected to theother end of said feed-bar.

GEORGE A. FLECKENS'IEIN. IMAX L. WA'I'ERMAN.