US1181917A - Sewing-machine stop. - Google Patents

Description

' Patented May 2,1916.

iIhII SEWING-MACHINE sror.

Application filed August 23, 1915.

To all whom it may concern Be it known that I, TsUNnJmo Nono'ro, a subject of the Emperor of Japan, residing at Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in Sewing-Machine Stops; 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. Y

This invention relates to machine elements, and especially to a pawl and ratchet; and the object of the same is to produce a check mechanism for preventing the retrograde turning of a drive shaft, which mechanism shall include a pawl yieldingly sup ported by a spring of improved structure and location. This object is carried out by the specific details of construction hereinafter more fully described and claimed.

In the drawings :Figure 1 is a detail perspective view of the ratchet, pawl and coiled spring. Fig. 2 is a view of the device located upon a conventional sewing machine.

Iiike characters of reference designate corresponding parts throughout the several )arts. 1 The improved device which forms the subject-matter of this application is adapted to be associated with a sewing machine of substantially the usual' and ordinary type embodying a drive wheel 10 operated by a pitman rod 9, connecting its wrist pin 8 with a treadle 11 in substantially the usual and ordinary manner.

Located upon the shaft 7 of the drive wheel 10 is a ratchet wheel 12 rigid upon and rotating with such shaft. Itigidly attached as at 13 to any convenient portion of the frame 14 is the smaller end of a conically coiled spring 15 surrounding one end of said shaft 7 and having the larger convolution opposite the attachment 13 bent outwardly into the plane of the ratchet as shown at 16 to form a hinge 17 for the pawl 18.

, Specification of Letters Patent.

Patented May 2, 1916.

Serial No. 46,949.

It is obvious that the ratchet 12 which is rigidly connected to the shaft 7 of the drive wheel 10 and rotates therewith may rotate in the direction indicated by the arrow and will not be retarded by the pawl 18, but should the ratchet 12 be moved in the opposite direction the pawl 18 will. engage one of the ratchet teeth and prevent further movement except under the yielding of the spring 15.

It is desired at times to reverse the motion of a sewing machine or other device a slight distance, and for this purpose the spring 15 is provided whose uncoiling permits of such limited movement. It is obvious that after such limited movement the recoil of the spring 15 will return the parts to the position shown at Figs. 1 and 2 with gentle force, owing to the length of the spring. The latter is coiled between the ratchet wheel and frame as best seen in Fig. 1, where it occupies very little space and is out of the way of the machinery or the operators garments. I prefer to give its convolutions a conical shape so that they shall not stand in contact with each other which might cause the device to rattle, and I prefer that the outermost and larger convolution 16 shall be deflected so that it will pass over the top of the ratchet wheel as seen, and carry the pawl 18 at a point where it is entirely out of the way.

In a device of the class described, the combination with a frame, and a driving shaft mounted therein; of a ratchet wheel fast on said shaft, a conical spring coiled around the shaft between the ratchet and frame with its smaller convolution secured to the latter and its larger convolution deflected and led over the periphery of the ratchet wheel, and a pawl pivoted to the em tremity of said larger convolution and engaging the teeth of said wheel, for the purpose set forth. 7

In testimony whereof I aflix my signature.

.TSUNEJIRO NOMOTO.

topics of'this patent may be obtained for five cents each, by addressing the Commissioner of latents,

' Washin gton, D. Q.

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