US570136A - Take-up for sewing-machines - Google Patents

Description

(No Model.)

I .J. M. MERROW. TAKE-UP FOR SEWING MACHINES.

No, 570,136. I Patented Oct. 27, 1896.

NITED STATES ATENT OFFICEGV JOSEPH M. MERROXV, OF MANSFIELD, CONNECTICUT.

TAKE-UP FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 570,136, dated October 27, 1896.

Application filed January 11, 1894. Renewed eeptember 25, 1896. Serial No. 607,002 N m deL) T0 to whom it may concern:

Be it known that I, JOSEPH M. MERROW, of Merrow, in the town of Mansfield, county of Tolland, and State of Connecticut, have invented certain new and useful Improvements in Take-Ups for Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the figures and letters of reference marked thereon.

My present invention relates particularly to that class of sewing-machines which form a double chain-stitch. In this class of machines the reciprocating needle is used to carry a thread through the fabric, and a re ciprocating looper provided with another thread is used to enchain or interloop the needle-thread below the fabric and the looperthread to produce the double chain-stitch, which is commonly designated generically as the Grover & Baker stitch. In order to produce this stitch in its best estate, it is necessary that the looper-thread should be properly taken up and let out, so that it will not be too loose at times or too tight at other times, and the object of this invention is to accomplish such purposes.

Throughout the drawings forming a part of this specification similar letters of reference indicate like parts.

Figure l is a front elevation of a doublechain sewing-machine provided with my new take-up apparatus. Fig. 2 is a detached view of a portion of the machine, showing a side elevation of the take-up devices.

A indicates the frame of the machine and serves as a support for the Working parts.

B indicates the needle-lever; C, its stud or support; D, the connecting-rod; E, the eccentric and hand-wheel; F, the main shaft; G, the looper-carrier; II, the looper; I, the looper-driving rod; J, the needle-bar; K, the needle; L, the Presser-foot; M, the feed, and N the tension.

- As is common in double-chain sewing-machines, I prefer to provide this machine with two sets of tensions, one for each of the threads, and the tension-disks for the looperthread may be placed upon the same stud 0, one set being upon the front side of the proj ection a of the frame and the other set being upon the rear side of the said projection, the

stud O passing through and being secured to the said projection Ct. It is not necessary, however, that the looper-thread should always be provided with the usual tensions, as

guide adjustably secured to its support 5,

which latter is movably secured to the frame of the machine by means of the screw 6 and is held in position by means of the frictiondisk 7. 1 v

The needle-thread P passes through the tension and take-up devices in the usual manner. The looper-thread 8 may pass through the tensions, as usual, and thence in any convenient course through the stationary threadguide 4, thence around the periphery of the take-up cam 1,through the thread-guide 3,carried by the looper-driving-rod I, and thence to the looper.

The periphery of the cam 1 is made of such form as to take up and let out the looperthread to correspond with similar variations in the looper-thread caused by the reciprocations of the looper. The arrow upon the cam 1 in Fig. 2 indicates the direction of the revolutions of the said cam, and the arrow above the looper=thread in the same figure indicates the direction in which the looperthread will be carried or fed along as it is enchained or taken up in the production of the stitches. The periphery of the cam 1, as it revolves in the direction contrary to the feeding of the looper-thread, causes a slight tension on the said looper-thread in addition to its action as a take -up on account of the friction of the said thread upon the periphery of the said cam, and this slight tension is sufficient to produce an elastic stitch Without the employment of further tension apparatus. The amount of this friction varies with I slightly against the greater portion of the cam 1, so that if the looper-thread in breaking should have at any time a tendency to wind around said cam it will be caught by the brush instead of being carried around the cam. The brush also acts to clear the cam from any lint, oil, or other matters which might collect thereon. As the machine is operated the looper-thread is held nearly in one position as it passes through the eye or guide at, but as the looper-driving red I reciproeates longitudinally the looper-thread will be carried similarly by the thread-guide 3 and traverses more or less diagonally around a por tion of the periphery of the cam 1, with which it is in contact. I11 practice I find that it is preferable to make the irregular surfaces of the cam 1 substantially parallel with its axis of rotation, especially on account of the cost of construction, which would be greater if irregularities are made in two or more planes.

I have herein shown the cam 1 and the counterbalance 2 as being integral and secured to the main shaft by means of a single screw 11, but these two elements may be made separate, or the counterbalance may be made in two or more separate pieces.

Having thus described my invention, what I claim as new is 1. In a sewing-machine, such as described, the combination of the looper, the longitudinally-reciprocating looper-driving rod, the revolving take-up cam engaging the thread, the thread-guide mounted upon the said driving-rod on one side the cam and the fixed thread-guide located on the opposite side of the cam; substantially as described.

2. In a take-up mechanism such as described, the combination of a rotary take-up cam, a thread-guide, mounted upon a fixed support 011 one side of said cam and a second thread-guide mounted upon a support reciprocatin g in a plane substantially parallel with the axis of the cam and the face of the latter; substantially as described.

3. In a machine, such as described, the combination with the needle, and its actuating mechanism and the reciprocating looper and its actuating mechanism including the driving-rod, of the driving-shaft, the take-up cam secured to said shaft in position to engage the thread, the fixed thread-guide and the reciprocating thread-guide, the latter mounted upon the looper-driving rod, substantially as described.

J OSEPII M. MERROW. Vitnesses:

F. A. GRIsWoLn, \V. C. GRAHAM.

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