US547191A

US547191A - Carpet-sewing machine

Info

Publication number: US547191A
Authority: US
Publication date: 1895-10-01
Anticipated expiration: 1912-10-01

Description

(No Model.) 2 Sheets-Sheet 1.

O. G. ,VOLBERG.

CARPET SEWING MAGHINE.

No. 547,191. Patented Oct. 1,1895.

AN DREW $.GRMIAM. PHOTO-LI'H'IDVWASNINGTUKQC (No Model.) 2 Sheets-Sheet 2 C. C. VOLBERG.

CARPET SEWING MACHINE.

No. 547,191. Patented 00t..1, 1895.

FTQEE CHARLES C. VOLBERG, OF ALAMEDA, CALIFORNIA.

CARPET-SEWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 547,191, dated Octoberl, 1895.

Application filed November 17, 1894- Serial No. 529,159. (No model.)

To aZZ whom it may concern.-

Be it known that I, CHARLES CHRISTIAN VOLBERG, a citizen of the United States, re siding at Alameda, county of Alameda, State of California, have invented an Improvement States No. 296,744, issued to George Grisel,

April 15, 1894. The general arrangement of parts shown in said former patent, though varied somewhat in practice in the manufac-' ture of the machines, has been substantially adhered to in that the necessary adjustments of the looper are still effected from two points of contact by two set-screws, both of which have been necessary in acting upon the finger as heretofore constructed and hinged to effect the double adjustment of the 1ooper namely, its movement to proper proximity with the needle and its rise up under and beyond the needle. The difficulty of these old means of adjustment, both that shown in the patent and that used in practice, has been the uncertainty and inaccuracy of the regulation due to having to adjust the finger at two points, rendering it possible to adjust one too much and the other too little, and vice versa.

The necessity for adjustment in a carpetsewing machine is a frequent one, as the neodles Working through the hard material often become bent, requiring constant watchfulness on the part of the operator to adjust the looper up to the new position of the needle, and thus to avoid dropping of stitches. The object of my invention is to overcome this inaccuracy and uncertainty of adjustment by providing such a construction that I am enabled to dispense with the adjustment of the finger-piece at two points, and so construct and mount it that by the operation of a single set-screw both adjustments will be efiected accurately and'with facility.

Referring to the accompanying drawings for a more complete explanation of my invention, Figure 1 represents aside view of aportion of a carpet-sewing machine embodying my invention, showing a portion of the disk L broken away. Fig. 2 is a detail viewshowing the relative positions of the needle and looper and also the mounting of the looperin lever L. Fig. 3 is a perspective view of my invention.

It is unnecessary herein to illustrate or to describe the whole carpet-sewing machine, as it will be sufficient to show the parts immediately surrounding the looper, whereby the means for properly adjusting it may be readily understood.

G is the vibrating needle-arm, which carries the needle A.

B is the looper adapted to oscillate across the path of the needle and to pass closely under it and up beyond it.

L is a disk provided with a groove-cam,

which receives a roller-stud l of a looper-actuating lever L, pivoted at Z to a portion of the frame, and having oscillation from the pivot forward and back.

The parts thus described are similar to those in the patent above mentioned and to those in the machine as manufactured.

The bar which is carried by the lower end of the looper-actuating lever L and which I have herein lettered L is set by a screw l fixedly upon the shaft or stem 1) of the looper B. This bar has approximately the shape of a bell-crank lever and is set at its angle upon the shaft of the looper, said shaft being mounted and adapted to rock in a suitable bearing in the looper-actuating lever L. The upper arm of the bar is acted upon from be hind by a spring S, which is housed or seated within a socket in the lever L, and the tendency of said spring is to force the upper arm of the bar L outwardly.

Pivoted at Z in the extremity of the lower arm of the bar L is a regulating-lever O, the upper end of which lies face to face with the upright or upper arm of the barLi-and the lower end of which extends downwardly and lies normally in contact with the lower end or extension of the lever L.

A screw D passes through the upper portion of the regulating lever O and bears against the face of the upright arm of bar L and the upper end of said regulating-lever is adapted to come in contact with a fixed part or lug T of the frame of the machine. The set-screw is provided with a head d, adapting it to be readily turned, and said head may have applied to it a spring d, by the frictional contact of which the screw will be held in the position to which it is adjusted. In the initial position of these parts, in which the set-screw D is turned outwardly to its limit, so that the spring S forces the upper portions of the bar and of the regulating-lever to lie parallel and face to face and the lower end of the regulating-lever to rest in contact with thelower end of the looper-actuating lever L, the looper-shaft is so turned downwardly that the looper itself is removed to the greatest extent from the plane or path of the needle, and in this position will be inoperative, as it would miss the loop and drop the stitch. Now, to set the looper up in as close proximity to the needle as is necessary to render it operative, the set screw 1) is turned inwardly, and its inner end bearing against the upright arm of the bar will force said bar backwardly against its spring, and thereby raising the looper to proper position under the needle. In this operation the bar moves, rather than the regulating-lever C, because the regulating-lever has a fixed bearing between its lower end and the lower end of the lever L, so that the only effect of the screw D is to turn the regulating-lever about its pivot at b, therebyraisingthelooper. Thissameadjustment of the screw, by varying the position of the regulating-lever with relation to the oscillatinglever L and separating the upper end of the regulating-lever therefrom to a greater degree, alters the time of contact of the upper end ofvthe regulatinglever with the log T of the frame, thereby regulating the time and consequently the propinquity of rise of the looper under and beyond the needle, which rise is effected by the yielding of the regulating-lever and the bar about the pivotal point of their common connection through the shaft of the looper with the lever L. Thus a single screw effects both adjustments with accuracy and enables the operator to follow with his looper all the inaccuracies and bendings of the needle during the progress of the work.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

In a carpet sewing machine, the combination, with the frame provided with a fixed lug, a reciprocating needle, and a looper actuating lever, of a looper having its shank journaled in said lever, and means for adjusting the looper relative to said needle comprising a two-armed bar fixed to thelooper-shaft, a regulating lever, pivoted to one arm of said bar, having one end normally in contact with an extension of the actuating lever, and its other end in position to contact with said fixed lug, adjusting means carried by said regulating lever and cooperating with the other arm of said bar, and means forholding the latter arm in yielding contact with said adjusting means. In witness whereof I have hereunto set my hand.

CHARLES C. VOLBERG. \Vitnesses:

S. H. NOURSE, WM. F. BOOTH.