US1927489A - Sewing machine feeding mechanism - Google Patents

Description

Sept. 19, 1933. A B CLAYTQN 1,927,489

SEWING MACHINE FEEDING MECHANISM Filed Oct. 29, 1951 2 Sheets-Sheet 1 Wbfweoo:

wmm @Kaw/WMS Sept. 19, 1933. A B, CLAYTQN 1,927,489

SEWING MACHINE FEEDING MECHANISM Filed Oct. 29, V19151 2 Sheets-Sheet 2 ndrewB. Clay/t0n.

Patentedv sept. 19, 1933 vThis invention relates toV sewing machines, more particularly of the cylinder-bed type, and has for an object to provide such a machine with a feeding mechanism, the feed-dog of which has a parallel motion or, in other words, moves so that its work-engaging surface is substantially parallel to the throat-plate at all times during its rising-and-falling and feeding-and-return movements. I believe I am the .first to provide a cylinder-bed sewing machine with such a feedmotion arranged to feed the work in a direction across or transversely of the cylinder-bed.

A feature of the invention is its compactness andpeculiarly efficient adaptibility to the requirements of a cylinder-bed chain-stitch sewing machine wherein space is at apremium. Another feature of the invention is its sturdiness and ability-to handle heavy work Vwithout undue strain on the parts.

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 drawings of a preferred embodiment of the invention from which the several features of the invention and the advantages Vattained thereby will be readily understood by those skilled in the art.`

Fig. 1 is an end view of the cylinder-bed of a sewing machine showing my `improved feeding mechanism incorporated therein. Fig. 2 is a top plan view of the feeding mechanism; Fig. 3 is al view substantially on'the line 3 3, Fig. 2, with the feed-dog and its carrier-bar removed. y Fig. 4 is a section on theline 4 4, Fig. 2. Figj is a section on the line 5 5, Fig. 2. Fig. 6 is a perspectivefview of the feed-bar. Fig. 7 is a perspective view of the feed-rocker, and Fig. 8 is a perspective view of the feed-rocker supporting.

and lifting means which may be calleda feedlift rocker. l'

1 represents the hollow cylinder-bed of a sewing machine within and lengthwise of which is the main-shaft 2. The throat-plate is shown at 3 and the feed-dog at 4. Thefeed-ddg 4 has the usual shank 4' which isseated in the groove 5 in the feed-bar 6 clamped to the pin 7 which `is journaled in the upstanding ears 8, 8 of the feedrocker 9. The feed-bar has an offset forked arm 10 which embraces the follower block k11 on the feed-lift eccentric l2 on the main-shaft 2.

The feed-rocker 9 is fulcrumed on the supporting pin 13V of the feed-lift rocker including the spaced arms 14 which carry the pin 13 and are fixed to the rock-shaft 15 journaled in the lower '-'1 f-isEW1NGMAQHINEFEEDINGMECIM V`SM I. B.*C.laytlorlf:Unio-r1,Iy

The Si,nger.gMa11ufacturing Company, Eliza" ,p l .Liza .corporation Y V Application October 29, 1931.. -SerialeNo.z571,704 l N. lJl',.assigner vtof @ef-,New Jersey.

3 claims. (AC1. 112;,215?" rear corner of the cylinder-bed 1 in bearings 16, 16. Adjustably clamped by screws 17' to the rockshaft-l is a vertical arm 17 which is connected by a pitman 18 to a second feed-lift eccentric 19 on the main-shaft 2. The feed-lift eccentrics l2 60 and 19 are timed to lift the frontl and rear ends 1 of the feed-bar 6 substantially simultaneously and to substantially the same extent, thereby maintaining the feed-dog 4 in a horizontal position at all times with its teeth parallel to the throatplate 3.

The feed-rocker 9 has two ears ,20, 20 aording a long bearing for the pinL 21 to which pin is fixed the pitman 22 embracing the adjustable feed-advancing eccentric 23 on the main-shaft. The collar 24 fixed to the pin 21 between the ears 20, 20, holds kthe pin 21 against endwise movement. 1

It will be observed that the` feed-rocker 9, whichsupports and lifts the rear end of the feedbarv 6, is of the maximum vertical dimension allowed by the space within the cylinder-bed. This provision minimizes and renders negligible the vertical component of motion of the rear end of the feed-bar about the pin 13 as a center.,8 0 A substantially true parallel motion of the feedd* dog is thus more easily attained.

.By loosening the set-screws 17' which clamp the arm 17 to the feed-lift rock-shaft 15, the feed-.rocker 9 may be raised or lowered to adjust the plane of the feed-dog teeth to the desired parallel relation to the throat-plate 3. By this same adjustment the feed-dog may of course be tilted either 'forwardly or rearwardly as may be desired in certain special sewing operations where a fulling or stretching action is required. t

It is also to be noted that the present feedmechanismis entirely clear of the space below and in front of the main-shaft'which is occupied by the looper-mechanism shown in my oopending g5 application Serial No. 571,703, filed herewith. Q

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

1. In feeding mechanism for sewing machines, a main-shaft having three eccentrics thereon twofoo of which are feed-lift eccentrics androne of which@ is a feed-advance eccentric, a feed-dog, a feedbar carrying said feed-dog and supported at its front end by one of .said feed-lift eccentrics, a vertically disposed feed-rocker supporting then?05 rear end of said feed-bar, a `feed-lift rocker ful-t crumed in rear of said feed-rocker and pivotally carrying the latter, said feed-lift rocker includingan upstanding arm, a horizontal pitman connection between said upstanding arm and them:

2 other of said feed-lift eccentrics, and a horizontal pitman directly connecting said feedrocker and said feed-advance eccentric.

2. Feeding mechanism for sewing machines comprising a main-shaft having two feed-lift eccentrics and one feed-advance eccentric thereon, a feed-bar supported at its front end by one of said feed-lift eccentrics, a feed-rocker arranged vertically in rear of the main-shaft and pivotally supporting bar at a point above the level of said main-shan, a feed-lift rocker pivotally carrying nid'ieadrocker, a pitman connectedvat one end to said feed-advance eccentric and at its other end, connected directly to said feed-rocker at a point between the feed-bar and the feed-lift rocker, and a horizontal pitman conneetim betweuxthe feedlift rocker and the other feed-lift eccentric. Y

"mi i fis' the rear end of said feed.

` in the length of the Yeed-bar,

3. A sewing machine having a frame including a work-supporting bed in the form of a hollow horizontal arm, a throat-plate, a shaft journaled within and lengthwise of said hollow horizontal arm, a feed-dog arranged to feed the work transversely of the free end of said arm, a feed-bar dsped transversely of and within the free end of said arm, a feed-eccentric on said shaft and connections for imparting feed-and-return movements to said feed-bar, and a pair of feed-lift eccentrics on said shaft and independent connecttl for imparting synchronized feed-lift movements to said feed-bar at two spaced points one of said connections including a Iced-lift rock-shaft journaled within and lengthwise of said arm.

ANDREW B. CLAYTON.

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