US143741A - Improvement in tuck-creasers for sewing-machines - Google Patents

Description

UNITED STATES PATENT GFEICE.

sYLvEsTEE nBABcooK, or ADRIAN, MICHIGAN.

' VuvwnovrlviENT IN TucK-cREAsERs FoR SEWING-MACHINES.

Specification forming part of Letters Patent No. 143,741, dated October 21,'1873 application filed May 17, 1873.

description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, and being a part of this specification, in which- Figure 1 is a perspective view. Fig. 2 is a I perspective view of the creasing devices depressed, as when compressing a fold in the fabric. Fig. 3 is a partial side elevation of the creaser-plate with the fabric lying thereon, showing the tuck previously made folded under the creaser-plate, a tuck in process of being stitched down, and the fabric lying on the creaser-stud ready to be creased.

Like letters refer to like parts in the several figures.

The nature of this invention relates to an improvement in tuck-marking attachments'to sewingmachines of that class wherein a series of creases are formed in the fabric on the line on which it is to be subsequently folded 5 and it consists in certain details of construction fully described hereinafter.

In the drawing, A is the base-plate, which is secured to the cloth-plate of the sewing-machine by a thumb-screw passing through the hole a. B is a gageplate, sliding in grooves I formed by turning'up the sides of the baseplate. b is the guide or gage for the fabric to be stitched and is formed by turning up the front edge of the plate B, which has also a longitudinal slot, through which the thumbscrew passes. The foregoing parts being already commonly known and used their oflice requires no explanation here. Gis a pressure-` bar of sheet metal, slightly curved in crosssection, except at the front end, with its convex side uppermost, and, sliding on the gageplate, is secured thereto by a set-screw, l). The front end of the pressure-bar is fiat, and is bent backupon itself, the upper part, forming the pressure-plate O1, having an open space underneath. From its surface a short and thin stud, d, projects upward. At the back end of the bar a T-shaped plate, G2, is riveted thereto,

carrying two posts, E, in which is journaled the rear end of the vibrating presser-arm F, bent to a right angle with its main part, and thrown upward by a helical spring, e, coiled about the arm. The front end is also bent in wardly at a right angle with the main part; and f is the tie-piece through which. the needle passes, the presser-arm being depressed by the down stroke of the needlebar of the sewing-machine. At the near end of the plate C2 is riveted to its under side a spring-plate, G, to serve as a cloth-smoother. It being in common use I disclaim the invention thereof. Above it a long narrow plate, H, is secured to the said plate C2, (curved in cross-section to make it sti'en) and to its front end I secure the lateral creaser-plate I, which comes over the pressure-plate C1, its edge coming behind the stud thereon. This plate I has two lugs, i, punched outwardly from its face, in and through which a horizontal rock-shaft, h, is journaled, and to which a rocker-arm, J, is riveted, its shorter arm having a notch, j,'cut out of it, where it passes behind and below the rockshaft, forming a jaw which sweeps by the stud on the pressure-plate below, when the rockerarm is depressed by the descending presserarm F. A spring, lo, coiled aroiuid the rockshaft, with its bale pressing under the rockerarm, throws the latter upward, and keeps the jaws retracted from the fabric until the creaserplate I strikes the pressure-plate C1, when a continued pressure will depress the long arm of the rocker J, and force its jaw past the stud, gathering a fold in the fabric, and creasing it by drawing it forcibly around the stud d against the creaser-plate I, whereby a close succession of well-dened creases are made in the fabric.

By journaling the presser-arm in the posts, as shown and described, the up throwing spring need only be strong enough to lift it, and thus offer but little resistance to the needie-arm of the machine, as it cannot sway laterally, by reason of its long bearings 5 hence it does not require a stijf spring to resist any tendency to bend it laterally. A

What I claim as my invention, and desire to secure by Letters Patent, is

The movable pressure-bar and plate C Cl,

the latter carrying the stud d, the plato G2, struotod and operating as and for the purpose posts E E, presser-arm F, spring e, and toset forth.

piece j', the oreaser-bar H, oreasenplate I hav- SYLVESTER P. BABGOCK. fing the rook-shaft l journaled in its lugs i z',

the rockenarm J having a notch, j, in its Witnesses:

shorter arm, and the spring k in connection S. M. BABCOOK,

with the base-plate A and gage-plate B7 con- S. E. GRAVES.

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