US300419A - Mechanical movement - Google Patents

Description

(Nd Model.)

L. E. WALLERMAN.

MECHANICAL MOVEMENT. No. 300,419. r Patented June 17, 1884.

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UN rrnn Stern s LOUIS H. W ALLERBYJ OF MIL\VATKEE, XVISCONSIN.

MECHANlCAL movement SPECIFICATION forming part of Letters Patent No. GOO/H9, dated June 17, 188%.

Application filed January 152, 1584. (No model.)

To a-F who/2t it may concern/.-

Be it known that 1, Louis E. XVALLERMAN, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of XVisconsin, have invented certain new and useful Improvements in Mechanical Movements; 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, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of thisspecification.

My invention relates to improvements in mechanical movements, and the object thereof is to provide means by which an adjustable circular cam of a given diameter may be rotated with greater or less eccentricity to its supporting-shaft or in line with such shaft between and in contact with the bearings of two rigid immovable arms of a lever, whereby, by the adjustment of said cam toward or from the center of such shaft, the throw of the lever may be increased, diminished, or stopped, and whereby said lever is moved in both directions solely by said cam without the aid of springs, and a more positive movement is attained at a less expense of power than by the ordinary methods. This movement is adapted to be used in converting rotary into reciprocating motion whenever it is desirable for any purpose to increase or diminish the length of the movement of an arm which is actu ated by an eccentric, and it is especially adapted to be used in connection with a sewing-machine, ior transmitting motion to the feed mechanism, as by its application to such purpose the feed mechanism is readily adjusted for short or long stitches, as may be required. I have therefore illustrated one manner of applying my invention in connection with a sewing-machine, and the drawings and specification illustrate and describe the invention thus applied.

Figure 1 represents the arm and bed-plate of a sewing-machine, part in section, showing a side view of my adjustable cam upon the band-shaft in connection with the vibrating lever. Fig. 2 is a longitudinal section of the band-shaft and cam in connection with the cam-adjusting" device. Fig. is a side view of the cam upon a band-shaft, showing the band-wheel, the adjusting-knob, and part of the band-shaft in section. cross-section of the band-shaft, the adjustable cam, and the device by which the same is adjusted.

Like parts are represented by the same ref erence-lettcrs throughout the several views.

A represents the ordinary band-shaft, B the band-wheel, and O the arm, of a sewingmachine.

D is my improved adjustable cam, from and by which mot-ion is communicated to the feed-lever B through the cam-lever F. The cam-lever is centrally pivoted on the pivotal bolts G, in the ordinary manner. Hcreto fore it has been common to provide the camlever with but one arm only, when, as before mentioned, the said lever F is moved in one direction by the action of the cam and in the opposite direction by the action of a spiral spring, which spring is usually attached to the long arm of the i'ceddever E. By my improvement the cam-lever F is provided with two arms, H H, which operate upon the respective sides of the cam D, whereby said lever is caused to vibrate toward the right and left with each rotation of said cam.

I-Ieretofore it has been common to use a conical cam adapted to be adj nsted longitudinally upon the band-shaft A relatively to the cam bearing-surlhce of the cam-lever F,whereby the length of stitch is increased or diminished as the greater or less diameter of said conical cam is brought in contact.- with the bearing-surface of said cam-lever. It is obvious that it would be impossible to use a conical cam with a fork or twoarmed lever, as such arms would not simultaneously bear upon both sides of such cam, except at one point of adjustment only, for if adjusted to the greater diameter they would not fit the less, or, on the contrary, if adjusted to the less diameter would not fit the greater. By my improvement I am enabled to dispense with the conical-shaped cam and use one having horizontal bearings, as shown in Figs. 2 and 3, and the length of stitch is governed by adjusting said cam eccentrically to said bandshaft, which end is accomplished through the knob .T, rod Iii, eccentric L, and pins M Fig. i is a vertical IOC WVhen the cam D, rod K, eccentric L, and pins M N are adjusted relatively to each other, as shown in Fig. 4, said parts all move together, describing a true circle around a common center, without communicating any motion whatever to the cam-lever F, and the required vibrating motion is attained only as said cam D is adjusted eccentrically to said band-shaft toward the left, which end is accomplished by turning the rod K, when it is ob vious by such movement that the eccentric pin L will approach the vertical either above or below the common center of such parts, and thereby carry the cam D toward the left, said cam D being adapted to be adjusted and the length of the stitch increased or diminished a distance corresponding to the space 0 between the periphery of the band-shaft and the inner surface of said cam. The pins M N are rigidly fixed at their outer ends in the cam D, while their inner ends bear against the surface only of the eccentric L, and permit of the required movement of said eccentric L as said cam D is adjusted. It is obvious that the periphery of the cam D is formed in a true circle, as well as that of the band-shaft A and adjusting-rod K, and that the same is adapted to serve as a cam only as it is adjusted eccentric to said band-shaft by turning said rod K.

In operation the band-shaft A, rod K, with eccentric L, and cam D, all rotate together. Vhen desired to increase or diminish the length of the stitch, such end is accomplished by holding the band wheel or shaft at rest and turning the knob J. The knob J, being rigidly affixed to the rod K, carries with it the eccentric pin L, which, acting against the inner ends of the pins M and N, move said cam D in or out of center relatively to said band shaft, whereby the vibrating movement of the cam-lever F is increased or diminished corresponding to the adjustment of said cam, and

the feed'lever E, which is actuated thereby,

er or less distance, and thus, as stated, increase I or diminish the length of stitch.

It is obvious that, the upper end of the camlever being divided, as it is, into two arms, the same is adapted to be moved both toward the right and left with a positive movement, and the spring by which one of said movements has heretofore been attained is dispensed with.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The mechanical movement herein described, consisting in the combination of a circular adjustable cam, D, having a uniform diameter, with the shaft A and arms H H of lever F, said cam being adapted by its adjustable attachment with said shaft to be adjusted more or less eccentric thereto within said arms, whereby the vibration of said lever F is increased or diminished, substantially as and for the purpose specified.

2. The combination, with the shaft A, of the adjustable cam D,provided with bearings M N, rod K, provided with eccentric pin L, and lever F, provided with arms H H, said cam D being adapted, by turning said rod K, to be adjusted accentric to said shaft A, substantially as and for the purpose specified.

3. The combination of shaft A, adjustable cam D, of uniform diameter, and lever F, having rigid arms H H, said cam being adapted to vibrate said lever F in both directions unaided by spring, and to be adjusted eccentric to said shaft between said arms, all substan tially as and for the purpose specified.

In testimony whereof I affix my signature in presence of two witnesses.

LOUIS E. WALLERMAN.

Witnesses:

O. T. BENEDICT, G. E. STELLER.

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