US679409A - Take-up mechanism for sewing-machines. - Google Patents

Description

Patented July 30, IBM. F. L. ALLEY. TAKE-UP MECHANISM FOR SEWING MACHINES.

(Application filed Aug. 8, 1896.)

(No Model.)

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UNirnn STATES PATNT OFFICE.

FREDERICK L. ALLEY, OF LYNN, MASSACHUSETTS.

TAKE-UP MECHANISM FOR SEWING-=IVIACHINES.

SPECIFICATION forming part Of Letters Patent N0. 679,409, dated July 30, 1901. Application filed August 6, 1896. Serial No. 601,932. (No model.)

To all whom, it may concern:

Be it known that I, FREDERICK L. ALLEY, a citizen of the United States, residing at Lynn, in the county of Essex and State of Massach usetts, have invented certain new and useful Improvements in ShOe'SeWing Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

In shoe-sewing machines it has been found to be desirable while the take-up is giving up its thread to the shuttle duringthe operation of forming a stitch to prevent as far as practicable a retrograde movement of the needlethread, which would tend to allow the thread to become slackened between the take-up and the work. To secure the above-suggested result, it has heretofore been proposed in the art to provide what has been termed an auxiliary take-up, which acts upon the thread between the take-up proper and the supply end, as shown, for example, in United States Patent to O. Dancel, No. 366,935, dated July 19, 1887, also in patent to French and Meyer, No. 412,703, dated October 8, 1889, alsoin patent to same inventors,No. 473,870, dated April 26, 1892.

The device above noted has been found to be unsatisfactory in operation in that the auxiliary take-up not acting directly upon the needle-thread but being arranged to act upon the thread back of the take-up in order to take up any slack in the needle-thread must necessarily render the thread around the roll of the take-up proper and generally around one or more thread-guides, rendering its operation slow and for many types of machine ineffectual.

The present invention has for its object to provide an auxiliary take-up which is arranged to act upon the thread between the take-up proper and the work; and to the above end the present invention consists of the devices and combinations of devices hereinafter more specifically set forth and claimed.

A preferred form of the present invention is illustrated in the accompanying drawings, in which Figure 1 is a side view of a shoe-sewing machine, showing the present invention applied thereto. Fig. 2 is an enlarged side view of the take-up proper and auxiliary take-up; and Fig. 3 is a front view of the same, partially in section.

Similar letters and figures of reference refer to similar parts in all the views.

In the drawings, T is the backrest, S is the back gage, E is the looper, His the needle, P is the awl, A is the channel-guide, D is the take-up, and (Z the take-up lever, allof which parts, except as hereinafter noted, together with their actuating mechanism, may be of any usual or convenient construction and form no part of the present invention.

As shown in the drawings, the parts above referred to are substantially similar in form and arrangement to corresponding parts of the machine now known in the trade as the Goodyear lock-stitch welt-machine and embodying the in vention of Christian Dancel.

In accordance with the present invention I provide an auxiliary take-up 10, which acts upon the thread 12 between the take-up D and the work to prevent a retrograde movement of the needle-thread while the take-up proper is giving its thread to the shuttle.

As shown in the drawings, the auxiliary take-up 10 comprises an arm 2, which is pivotally connected at one end to the take-up lever cl and at its free end carries the threadroll, which forms the roll of the auxiliary take-up 10. In practice I find it convenient to extend the trunnion d, which supports the roll of the take-up D upon its actuating-lever d, to form a bearing for the arm 2, which is held in place thereon by a bolt 3 and washer 4; or other suitable means.

The above-described arrangement is such that the auxiliary take-up 10 has a swinging motion with the take-up D and also independently thereof about the trunnion d as an axis.

To limit the swinging movement of the auxiliary take-up 10 about the trunnion d, I find it preferable to provide on the take-up lever cl or an extension (1 thereof a stop 5, which is adapted to come in contact with the arm 2 and a lateral extension 6 thereon, the arrangement being such that the auxiliary take-up 10 can swing in one direction about the trunnion (1 until the arm 2 strikes the stop 5, and

in an opposite direction until the lateral extension of the arm 2 strikes the stop 5. To

render the swinging movement of the take-up 1O adjustable in extent, I find it convenient to provide in the lateral extension 6 of the arm 2 a threaded bearing, which receives a correspondingly-threaded bolt 7, the inner end of which is adapted to strike the stop 5. The swinging movement of the auxiliary take-up 10, which I have hereinbefore described as oocuring when'the take-up D is giving thread to the shuttle, is preferably secured by means of a suitably-placed spring 8, which acts to swing the auxiliary take-up 10 about the trunnion d as an axis until the slack in the needle-thread between the tension and the work has been taken up or until the extension 6 of the arm 2 or the bolt 7 strikes the stop 5, and which yields to allow the auxiliary take-up 10 to give up its thread to take-up D until the arm 2 comes in contact with the stop 5. As shown in the drawings, the spring 8 consists of a coiled spring, one end of which is conveniently secured to the trunnion d by means of the bolt 3 and washer 4, and the other end of which bears against a suitable stop near the free end of the arm 2, said stop being in practice formed by an extension of the trunnion 9, which supports the auxiliary take-up roll through the arm 2, the spring 8 projecting under a nut 20, which clamps it against the arm 2, holding it firmly in position.

In the machine of the drawings the lead of the thread 12 is from the wax-pot (not shown) around the tension-wheel 14, thence over the roll 15, thence over the roll of take-up D, thence over the roll 16, thence over the roll of the auxiliary take-u p 10, and from the auxiliary take-u p 10 direct to the looper E, needle H, and work.

The operation of the machine of the drawings is as follows: While the take-up D is being raised by its lever 01 to set the stitch the spring 8 is contracted to allow the arm 2 to bear against the stop 5 and the auxiliary takeup 10 to yield its thread to the take-up D, so

that at the limit of the upward movement of lever d the parts are in substantially the relative position shown in dotted lines in Fig. 1. When the take-up D has set the stitch and the lever d begins its downward movement to allow the take-up D to give thread to the shuttle as fast as any slack is developed in the needle-thread, the spring 8 expands and swings the auxiliary take-up 10 about the trunnion d until such slack is taken up or until the bolt 7 strikes the stop 5, so that at the limit of the downward movement of lever 01 the parts are in the position indicated by the full lines in Fig. 1 or in an intermediate position, depending upon the amount of slack developed in the needle-thread.

Having thus described my invention and its mode of operation, I desire to say that I do not consider my present invention limited to the specific form and arrangement thereof hereinbefore described; but

I claim as novel and desire to secure by Letters Patent of the United States-- 1. A take-np mechanism for sewing-machines, having, in combination, a main takeup,its actuating-lever and a spring-controlled auxiliary take-up pivotally mounted on the actuating-leverof the main take-up in position to engage the thread between the needle and main take-up, substantially as described.

2. A take-up mechanism for sewing-machines, having, in combination, a main takeup, its actuating-lever, a spring-controlled auxiliary take-up carried by said lever, and a stationary thread-truck located to engage the thread between the main and auxiliary take-ups, substantially as described.

In testimony whereof I atfix my signature in presence of two Witnesses.

- FREDERICK L. ALLEY.

Witnesses:

JOSEPH WARREN, HARTLEY F. A'rwoon.

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