US447009A - Take-up for sewing-machines - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1.

H. H. CUMMINGS. TAKE-UP FOR SEWING MACHINES.

No. 447,009. Patented Feb. 24,1891.

(No Model.) 2 SheetsSheet 2.

H. H. CUMMINGS.

. TAKE-UP FOR SEWING MACHINES.

No. 447,009. Patented Feb. 24, 1891.

ulna-.5555. ivl/f/v 727/? UNITED STATES HENRY II. CUMMINGS, OF MALDEN, ASSIGNOR TO THE DAVIS-MOORE SEXVING MACHINE COMPANY,

OF BOSTON, MASSACHUSETTS.

TAKE-UP FOR SEWlNG-MAOHiNES.

SPECIFICATION forming part of Letters Patent No. 447,009, dated February 24, 1891.

Original application filed March 26, 1890, Serial No. 345,432. Divided and this application filed July 3, 1890. Serial No. 367,635. (No model.)

To all whom it may concern: Y

Be it known that I, HENRY H. CUMMINGS, a citizen of the United States, residing at Malden, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Take-Ups for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention has for its object to provide an improved take-up mechanism for sewingmachines, my improved take-up being more especially intend d for use on wax-thread or other machines designed for heavy work.

In the accompanying drawings, Figure 1 shows a side view of a wax-thread sewingmachine embodying my invention. FigsB and 3 are detail side views, partly in section, of the take-up mechanism; and Fig. 4 is a front end view of the latter. Fig. 5 is a detail section on line 5 5 of Fig 4.

A denotes the frame of the machine; 13, the driving-shaft suitably journaled in said frame and provided near its rear end with a grooved cam 12.

The machine herein shown is fully illustrated and described in my application, Serial No. 345,432, filed March 26, 1890, of which this application is a division. It may be stated here, generally, that this machine embraces a rotary shuttle and a hooked needle, both arranged below the work-plate and adapted for forming lock-stitches; but as the general features of this machine form no part of this application they need not be herein particularly described.

N is the take-up lever provided between its ends with a pin or shaft n, which is rigid therewith and which is j ournaled in the frame A. The take-up lever N thus has two arms 011 opposite sides of its pivot or fulcrum, the lower or take-up arm being preferably furnished with a roller of, around which the thread passes, as more clearly shown in Fig. 3, said roller co-operatin g with resistance-rollers 0 on stationary axes attached to the frame A. The upper arm of the take-up lever is provided with a pin m, on which is pivoted an arm or lever m, extending below the fulcrum n of the take-up levcigand to the lower end of which is attached the forward end of a connecting-rod K, the rear end of which latter is secured to the slotted upper end of an operating-lever K, receiving movements from the cam b on the driving-shaft B. The lever m is provided with an arm or portion m formed rigid therewith in any suitable manner. The pivot n of the take-up lever is provided with a hole a through which the thread passes, and forward of said hole on a portion of the take-up lever just below the center of the fulcrum 0f the latter is a bearing portion or, over which the thread runs, said bearing portion being arranged to be engaged by the forward or free end of the arm pressing on said bearing portion or on the thread running over the same will impart a backward or take-up movement to the lower arm of the lever N at the proper time. Thus when the connectingq'od K begins to move back ward, drawing with it the lower end of the lever m, the free end of the arm m is first pressed on the thread lying on the bearing portion 11, thereby clamping the thread, and as the said arm continues its downward or backward movement it forces the lower or take-up arm of the take-up lever backward, thus drawing up the thread to tighten a stitch. As the movements of the take-up lever are thus derived from the thread-clampin g arm 072 it will be apparent that the greater the resistance or the harder the pull of the take-up on the thread the tighter the latter will be clamped between the arm m and the bearing portion n. Thus the thread will always be securely clamped to prevent it from being drawn from the thread-supply when the take-up lever is operating to tighten the stitches, provided there is any resistance on the thread. As, however, the thread is entirely slack when the take-up first begins to operate, it is desirable,in order that the thread will be properly clamped at this time, that the take-up lever should not move too easily, and to this end 1 preferably provide the pivot pin or shaft or with a friction device consisting, as herein shown, of a pin m pressed against m of the lever m, so that the said arm by said shaft by a spring in, attached to the frame A by screws in and in, the latter serving to regulate the tension of said spring, so that the amount of friction on the shaft a may be varied, as may be desired.

13y providing the upper end of the takeup-operating lever K with a slot, so that the connection of the rod K therewith maybe changed, the throw of the take-up ma be varied,as may be desired. Adjustable stops L, attached to the arm or frame A and serving to prevent overthrowing of the take-up lever, are preferably employed. The forward movements of the take-up are effected by the draft of the thread when the arm in) is raised or swung away from the bearing portion 11 of the roller n, while the backward or takeup movements of said lever derived from the arm 121' are positive.

llaving thus described my invention, 1'

claim and desire to securehy Letters Patent 1. In a sewingnmehine, the conibination, with the stitch-forming devices, of a take-up lever having a bearing portion over which the thread passes, and an operating-lever, as 91/. serving to impart t'alie up movements to said take-up lever, said operating-lever being 1 provided with an arm or portion arranged to press upon and clamp the thread at said bearing portion and through such pressure to operate the take-up lever, whereby the greater the resistance on the thread and the harder the pull of the take-up the tighter the thread will be clamped.

eezooe ing two arms, one of which serves to take up the loops of thread and the other of which carries a pin, said take-up lever having a bearing portion over which the thread passes, and an operating-lever pivoted on said pin carried by the take'np lever and having an arm or portion to press upon and clamp the thread at said bearing portion, and by such pressure to operate the said take-up lever, said operatingdever extending from said pin be yond the fulcrum of the take-up lever, and means for actuating said operating-lever.

-t. The combination, with the stitch-forming mechanism of a sewing-machine and the frame thereof, of the talce-np lever N, having between its ends the pivot pin or shaft 71, rigid with said lever and journaled in said frame, said. take-up lever having at its upper end the pin 11/ and near its fulcrum the bearing portion a, over which the thread passes, the operating-lever m, pivoted on said pin m and having rigid therewith the arm "In", the free end of which is arranged to press upon said bearing portion and through such pressure to operate the takeup lever, and means for actuating said operating-lever.

5. The combination, with the stitch-forming mechanism ol'asewinganachineand the frame 5 thereof, of the take-up lever N, having between its ends the pivot pin or shaft 7t, rigid with said lever and journaled in said frame,

2. In a sewing-machine, the combination,

' of the said pin or shaft 12, the operating-lever with the stitch-forming devices thereof, of a take-up lever having rigid therewith a fulcrum pin or shaft, and being also provided with a bearing portion over which the thread passes, a friction device for the said fulcrum shaft, and an operating lever, as m, 1'

pin or having an arm or portion arranged to press said take-up lever having at its upper end the pin m and near its fulcrum the bearing portion a, over which the thread passes, a friction device for preventing free movement in, pivoted on said pin on and having rigid therewith the arm m the free end of which is arranged to press upon said hearing portion and through such pressure to operate the take-up lever, and means for actuating said operating-lever.

In testimony whereof I at'tix mysignature in presence of two witnesses.

HENRY ll. (,lIBUIINGS. \t'itnesses:

W1]. A. MACLEUD, 1i. \YALLALE.

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