US 2552350 A
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Description (OCR text may contain errors)
y 1951 R. F. SMITH 2,552,350
MOTION TRANSMITTING MECHANISM Filed Nov 12, 1.949
i\\\, mm /o 2/ 2O 20 IN VEN TOR. 225 22 PC6667 Fdw/n/ 4 24 I 9 V 7 I 5 "'1 flrroemfy Patented May 8, 1951 UNITED PATENT OFFICE MOTION TRANSMITTING MECHANISM Robert Floyd Smith, Fort Wayne, Ind. Application November 12, 1949, Serial No. 126,713
This invention relates to improvements in motion transmitting mechanism wherein a rotor having a cam activates a reciprocator through the medium of a follower having a swivei connection with the reciprocator.
It is a common practice to transmit movement to a reciprocator by a rotor having a cam thereon or an irregular groove with which the reciprocator has operative engagement, and generally such arrangements occasion more or less frictional re sistance or lost motion to the traveling parts.
The purpose of the instant invention is to afford a mechanism by which rotary movement is im-' parted to a reciprocator in which is substantially eliminated frictional resistance between the ac tivating and activated parts of the apparatus Another object of the invention is to accurately convert rotary motion into reciprocating motion with a minimum of frictional resistance which is advantageous especially where the activating cam is more or less irregular in its course.
Other objects and advantages of the invention appear in the following description.
An illustrative embodiment of the invention is shown in the accompanying drawings, in which:
Fig. 1 is a side elevational view of a structure in which the invention is incorporated, parts thereof being in section; h
Fig. 2 is a diagrammatical plan view showing overlapping sprockets that engage radially disposed pins on a cam carried by a rotor, the parts in section being on the line 22 of Fig. 1; and
Fig. 3 is a fragmentary vertical elevational view in central section of the structure shown in Fig. 1.
Figs. 2 and 3 are drawn to an increased scale.
The illustrative embodiment of the invention consists of a rotor, indicated. generally by A, by which a reciprocator, indicated generally by B, is activated through the medium of at gear mechanism or follower, indicated generally by C'.
The rotor A consists of a drum 4 secured upon a drive-shaft 5 mounted upon standards 6 that surmount a base I, the drum being adapted to be revolved accordingly as the drive-shaft rotates. The drum has a peripheral concentric cam 8 having opposite end walls 9 arranged in parallelism, the cam being of a selected shape suitably to accord with the particular movement desired to be imparted to the reciprocator B. The cam has a series of spaced radially projecting pins l0 extending from the center line of the cam that have operative relation with the follower C hereinafter described.
The reciprocator B is shown in an exemplary form which consists of alined shafts l I arranged to have sliding axial movement in bearings l2, the inner ends of the shafts being connected with a yoke [3 by which the follower C receives support. The reciprocator B is activated by the rotor mechanism through the medium of the follower C which is operatively connected with the cam on the rotor and the yoke on the reciprocator.
The follower C consists of an oscillating crosshead M provided with an upstanding shaft 15 that projects loosely through the yoke l3 and has on its upper end a collar [6 and a Washer I I that afford support for the shaft. By this arrangement the cross-head M is permitted to have swivel movement relative to the yoke l3. The cross-head has secured thereto parallel stubshafts I8 extending downwardly, on which are loosely disposed spur gears is that mesh with each other, and beneath said gears, loosely disposed on said stub-shafts, are'sprockets 20 arranged in separate parallel planes, so that the one sprocket overlaps the other. Both of said sprockets mesh with the series of pins ID that extend radially from the cam 8 and are activated thereby when the rotor A is revolved. The gears l9- and the corresponding sprockets '20 are connected by dog-pins 2i whereby movement of said sprockets imparted by the radial pins I0 is accompanied by corresponding rotation of said spur gears. By this arrangement is accurately controlled uniformity of travel of the sprockets as they are activated by the rotor.
On the lower ends of the stub-shafts I 8 are loosely mounted rollers 22 that are disposed astride the cam 8 and bear oppositely against the walls 9 thereof. Washers 23 and pins 24 on the lower portions of the stub-shafts are provided to support said rollers thereon.
In use, the drive-shaft is connected with any suitable source of power (not shown) and the reciprocator B is suitably attached to an object (not shown) to be activated thereby, so that, when the rotor is revolved, the object is moved to and fro through the medium of the follower and. the reciprocator to an extent limited according to the particular shape of the cam on the rotor. The invention is advantageous in that the swivel supported follower on the reciprocator and its spur gear and sprocket relation with the cam on the rotor aliords uniformity in the movement of the operating parts of the apparatus occasioned by imparting motion of the rotor to the reciprocator and in this manner is substantially eliminated lost motion between all of the movable parts of the apparatus as well as binding between 3 the rollers 22 and the adjacent walls 9 of the cam. Thus is assured precision in the action of transmitting movement from the rotor to the reciprocator.
Variations from the particular construction above disclosed may be resorted by the exercise of skill in the art, without departure from the spirit or scope of the invention.
What I claim is:
1. A motion transmitter having a rotor provided with activating means therefor, a reciprocator and a follower, said rotor having thereon a circumferential cam provided with an annular series of radially projecting pins located midway between the ends of said cam, said follower having a swivel connection with said reciprocator for imparting movement thereto and provided with rollers disposed astride the cam and bearing against the ends thereof respectively to limit relative play between the follower and cam, and a gear mechanism carried by said follower, said mechanism consisting of overlappin sprockets having engagement with said pins and spur-gears that mesh with each other and are individually connected with said sprockets for concurrent rotation therewith whereby is substantially maintained right-angularity of the follower with respect to the cam.
2. A motion transmitter consisting of a rotor, a reciprocator and a follower, said rotor having thereon a circumferential cam provided with an annular row of radially projecting pins located between the ends of the cam, said follower having operative connection with said reciprocator and provided with rollers disposed astride the cam and bearing against the ends thereof respectively to prevent play between the follower and earn, a gear mechanism carried by the follower having opposite overlappingsprockets engaging said pins and opposite spur-gears that mesh with each other and which have individual operative connections with the corresponding sprockets whereby rotation of said gears and sprockets is concurrent, thus to maintain right-angularity of the follower with respect to the cam, and means for activating said rotor.
3. A motion transmitter consisting of a rotor, a reciprocator and a follower, said rotor having thereon a circumferential cam the ends of which have parallel walls, an annular row of radially projecting pins located on said cam between said walls, said follower having operative connection with said reciprocator, and rollers disposed astride said cam and bearing against said walls to prevent lateral play between the follower and cam, a gear mechanism carried by the follower in cluding overlapping sprockets oppositely engaging said row of pins, and opposite spur-wheels having individual connections with said sprockets for concurrent rotation thereof, whereby is maintained right-angularity of the follower with respect to said cam, and activating means for said rotor.
4 A motion transmitter in which is included a rotor, a reciprocator and a follower, said rotor being provided with a circumferential cam having parallel walls and an annular row of radially projecting pins located between the walls, said follower having a cross-head operatively connected with said reciprocator to activate it and parallel stub-shafts extending from said crosshead, rollers on said stub-shafts that bear against the respective cam walls, sprockets loosely mounted on said stub-shafts engaging said row of pins, spur-gears meshing with each other loosely mounted on said stub-shafts having connections with said sprockets respectively for concurrent rotation thereof whereby is maintained right-angularity of the follower with respect to the cam, and means for activating said rotor.
5. In a motion transmitter, a rotor provided with activating means therefor, a reciprocator adapted for connection with a part to be driven thereby, an annular cam forming part of the rotor provided with parallel end'walls having thereon equally spaced from said walls an an nular row of radially projecting pins forming the center line of said cam, a follower having a swivel connection with said reciprocator to activate same and having opposing rollers bearing respectively against said walls, and a gear mechanism carried by said follower provided with spurgears that mesh with each other and sprockets engaging said row of pins, and means connecting each of said spur-gears individually with the corresponding sprockets to cause concurrent rotation thereof, said gear mechanism being adapted to maintain right-angularity of said follower with respect to said cam.
- ROBERT FLOYD SMITH.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 76,139 Atherton Mar. 31, 1868 142,903 Doubler Sept. 16, 1873