US484398A - Take-up for sewing-machines - Google Patents

Description

(No Model.) 2 Sheets-Sheet '1. J. BOLTON.

TAKE-UP FOR SEWING MACHINES.

No. 484,398. I Patented Oct. 18, 1892.

(No Model.) J 2 Sheets-Sheet 2.

TAKE-UP FOR SEWING MACHINES.

No. 484,398. Patented Oct. 18, 1892.

PATENT OFFICE JAMES BOLTON, OF CHICAGO, ILLINOIS.

TAKE-UP FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 484,398,

dated October 18, 1892.

Application filed February 18, 1892. Serial No. 422,053. ('No model.)

To all whom it may concern.-

Be it known that I, JAMES BOLTON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, 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 relates to that class of takeup mechanisms for sewing-machines in which a take-up lever is operated from the needlebar-actuating mechanism, thereby avoiding the use of a take-up cam, the object of my invention being to provide a take-up device of the class referred to in which the movements of the take-up lever will be strong and positive and will require but little power, and also in which the movements of the take-up lever may be properly timed relative to the stitch-forming devices. To this end I pivot my take-up lever to the upper portion of the head of the sewing-machine, and I provide the needle-bar-operating pitman with an arm provided near its upper end with a pin having a loose connection with the take-up lever, the said pin being eccentric to the crank-pin from which the link is operated, so that it will travel in a path or orbit which is somewhat elliptical, thereby securing the proper timing or fast and slow movement for the take-up lever.

In the accompanying drawings, Figure 1 is a front view of the head of a sewing-machine provided with my improved take-up mechanism. Fig. 2 is a sectional side view of the same. Fig. 3 is a detail view in horizontal section on line 3 3, Fig. 2. Figs. at and 5 are slightly-modified forms of my invention.

A denotes the head or front portion of the bracket-arm of a sewing-machine, and B a portion of the main driving-shaft provided with a crank 19, having a crank-pin b.

O is the needle-bar, to which is secured a block 0, connected by a pitman D with the crank-pin b, the said pitman having secured thereto or formed integral therewith the block (1, having arms 01, to which is rigidly attached the arm E, provided near its upper end with a pin 6, which is eccentric to or out of line with the crank-pin b.

F denotes the take-uplever connected by a link f with the pin 6, the said link forming a loose connection with the said pin. Instead of connecting the pin c with the take-up lever by means of a link, as shown in Figs. l and 2, the said take-up lever may be made in the form of a bell-crank F, as shown in Figs. 4 and 5, the lower arm of the said bell-crank lever being provided with a slot f which is entered by the said pin 6, the said slot in which said pin works thus also affording a loose connection between the said pin and the take-up lever.

In the operation of the machine as the crankpin 19 rotates the pitman D will receive a v1- brating movement, which will be imparted to the arm E, which is rigidly connected therewith at its lower end, and the pin a at the upper end of the said arm will thus be caused to travel in an elliptical path or orbit, and will thereby impart a proper fast and slow vibratory movement to the take up lever, whether the connection between the said pin e and the take-up lever be made by means of a link or a slot. The fast or quick movement of the take-up lever occurs, as is usual, when the shuttle has passed through the loops of needle-thread and the stitch is to be tightened and the slow movement when the needle is descending and the needle-thread is to be gradually slackened.

It will be obvious that the proper timing of the take-up lever may be secured by changing the pivotal point of the take-up lever by lengthening or shortening the link or by making the arm E of greater or lesser length, so as to vary the position of the pin 6 with reference to the crank-pin b. This variation in the timing may be still further changed, if desired, by making the slot f in the take-up lever somewhat curved or irregular, as shown in Fig. 5, as will be obvious.

Having thus described my invention, I claim and desire to secure by Letters Patent- 1. A take-up mechanism for sewing-ma chines, consisting of the combination, with a vibratory take-up lever pivoted to the head of the 'machine, of a rotating driving-shaft provided with a crank, a needle-bar, a pitman serving to connect said crank with the said needle-bar, and an its lower end with the lower man and provided at or near its upper end of said pitend arm rigidly connected atwith a pin having a loose connection with the said takeup lever.

2. A take-up mechanism for sewing-machines, consisting of the combination, with a vibratory take-up lever pivoted to the upper portion of the head of the machine, of a rotating driving-shaft provided with a crank, a needle-bar, a pitman serving to connect said needle-bar with said crank, an arm rigidly connected at its lower end with the lower end of said pitman and provided at or near its upper end with a pin, and a link serving to connect said pin with said take-up lever.

3. A take-up mechanism for sewing-machines, consisting of the combination, with a vibrating take-up lever pivoted to the upper portion of the head of the machine, a rotat- JAMES BOLTON.

Witnesses:

HENRY CALVER, HELON V. GUsHMAN.

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