US439378A - Tension device for sewing-machines - Google Patents

Description

2 Sheets-Sheet 1.

Patented Oct, 28, 1890.

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UNITED STATES PATENT OFFICE.

JACOB BOPPEL, OF NEWARK, NEW JERSEY.

TENSION DEVICE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 439,378, dated October 28, 1890.

Application filed October 11, 1889. Serial No. 326,657. (No model.)

To all whom it may concern..-

Be it known that I, JACOB BOPPEL, a citizen .of the United States, residing at Newark, in

the county of Essex and State of New Jersey, haveinvented certain new and useful Improvements in Tension Devices for Sewing-Ma chines; andI 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, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

The object of this invention is to secure a more uniform tension in that class of sewingmachines represented by the one shown in my prior application, Serial No. 295,537, filed January 5, 1889.

The invention consists in the improved tension device and in the arrangements and combinations of parts, substantially as will be hereinafter set forth, and finally embodied in the clauses of the claim.

Referring to the accompanying drawings, in which like lettersindicate corresponding parts in each of the several figures of the two sheets, Figure lis a side elevation, and Fig. 2 an under side plan, of the head of a sewingmachine, the general constructions and arrangements of parts of which are similar to those described and shown in my prior application for a patent above referred to. Fig. 3 is an end view of a peculiar spool-holdin g tension device embodying the greater part of my invention. Fig. dis an elevation showing the pivoted parts comprising said tension device turned from the positions indicated in Fig. 3, so that the said device is open to receive the spool. Fig. 5 is a plan of the device when the parts are in the positions indicated in Fig. 4. Fig. 6 is a section taken on line 00, Fig. 3. Fig. 7 is a plan of certain shafts or rods on which the said tension device moves reciprocatingly; and Fig. 8 is a section of the same, taken on line y. Fig. 9 is an end view taken from the end opposite that shown in Fig. 3. Fig. 10 is a detail view of a slide adapted to engage the shafts or rods shown in Fig. 7 and Fig. ll is a section taken on line .2, Fig. 9.

In said drawings, Ct indicates the bed-plate of the machine; I) b, shafts or rods on which the spool and its tension mechanisms slide back and forth under the influence of a spoolreciprocator c, and d is a toothed sleeve connected with a looping device, (indicated in Fig. 2,) by means of which the needle-thread is caught and a loop formed therein to allow the spool and its thread to be passed through to form the stitch, as has been explained in the prior case above referred to.

The shafts or rods b b are cut or split, as at g, as by a saw, and on the same is arranged the spool-holding tension device 71. This consists of two parts 77. 71. one of which is pivoted on the other, as indicated in Fig. 5, so that the said tension device can be opened to receive the spool. Each of said pivoted parts is provided with a disk-like head 77. k made of sheet metal and concavo-convex in shape, as indicated in Fig. 6, the center of each being perforated, as a 71 to allow for the insertion of the shafts or rods 1) b. At the center of one of said parts the one marked h is fixed what may, perhaps, be termed a slide. This consists of a plate 1', adapted to fit in the cuts or slots g in the rods or shafts b b, and to slide longitudinally back and forth therein. The'said plate is turned at its edges, as at 11' 7 so as to lap onto the outer faces of the shafts or rods, as willbe understood upon reference to Figs. 3, 4, and 9. By this means the slide is held in proper relative position. The faces of said shafts or rods 1) b, onto which the turned portions 2" lie, are recessed slightly, as indicated at g in Fig. 7, so that when the parts g '1 are together a continued roundness is presented to the spool. At the end of said plate 11 where it it is fixed to one of the disk-like heads, the same is broadened to presentabroad bearing j to the inner face of the disk, as will be understood upon reference to Figs. 10 and 11. The plate is attached to the part h by means of solder, by preference, although it may be secured in any other suitable manner. The slide being thus rigidly joined to the tension device, the latter is allowed to move reciprocatingly on the shafts or rods; but no pivotal movement thereof is allowed, as will be evident.

In the preferred construction, each of the pivotal parts h k are constructed with arms k 70, formed integral with the disks h h and extending from opposite sides of said disks longitudinally parallel with the slide or plate t'. The arms 70 k of the part 77, overlie or lie on the outer sides of those of the part h, as shown in Figs. 5 and 6, and the four arms are joined in pairs by hinge-pins or pivotal rivets Z, on which the pivotal parts 72 h turn in opening the device to receive the spool, as before described. The outer of said arms k k are each provided with an eye m, through which the spool-thread passes, the said thread passing from said spool between the arms k and outward through the eye. By this disposition of the thread the friction producing the tension is secured, and the eye is always in the same relation to the shaft and needle because of the tension device being unable to turn on its shafts or rods. Thus regularity of tension is attained.

Having thus described the invention, what I claim as new is- 1. In a sewing-machine, the tension device combining, with the split rods or shafts b b, a spool-holder having the slide 7 and pivoted parts h 7L2, one of which is provided with an eye m, substantially as set forth.

2. In combination with a shaft, a spoolholding tension device, and means forholding said tension device from pivotal movement, and means for reciprocating the same on said shaft, the said device consisting of parts h 72. pivoted at Z, one of which parts is provided with a thread-perforation m, substantially as set forth.

3. In a sewing-machine, the shafts b 5' thereof, the tension device consisting of disks 7L3, centrally perforated and one provided with a central slide, and each disk provided with arms 70 is, pivotally riveted together, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 26th day of September, 1889.

JACOB BOPPEL.

Witnesses:

CHARLES H. PELL, OSCAR A. MICHEL.

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