US596053A

US596053A - crisp

Info

Publication number: US596053A
Authority: US
Publication date: 1897-12-28
Anticipated expiration: 1914-12-28

Description

(No Model.) 3 Sheets-Sheet 1.

J. E. CRISP.

MEGHANICALMOVEMENT. No. 596,053. Patented Dec. 28, 1897.

WITNESS-E5 INVEN D @fl Q I e 2%,

(No Model.) 3 SheetsSheet 2. J. E. CRISP. MECHANICAL MOVEMENT.

No. 596,053. Patented Dec. 28, 1897.

(No Model.) 3 SheetsSheec 3.

J. E. CRISP, MECHANICAL MOVEMENT.

No. 596,053. Patented Dec. 28, 1897.

WITN 55:5 INVENTEJR Mai 15 6? M w, 6;

NrTED STATES ATENr much.

MECHANICAL (MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 596,053, dated December 28, 1897. Application filed January 14, 1897. Serial No. 619,169. (No model.)

To all whom, it may concern.-

Be it known that I, J OSEPH E. ORIsP, a citizen of the United States, residing at Somerville, in the county of Middlesex and State of Massachusetts,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. I

The present invention relates to an improved mechanical movement, and more particularly to a combination ofmechanical ele ments which will impart a variable rotation to a shaft or crank or a variable reciprocating movement to an element of a machine from a rotating driving-shaft having a constant speed.

The object of the invention is to produce a mechanical movement of simple form and arrangement and of great power to impart a variable rotary movement to a shaft or crank or a variable reciprocation to reciprocating parts of various machines from a constantlydriven power-shaft.

To the above ends the present invention consists of the devices and combination ofdevices which will be hereinafter described and claimed.

In the embodiment of the present invention shown in the accompanying drawings it is shown as adapted to impart a variable reciprocation to a bed of a metal-planing machine, the said bed being advanced slowly while the tools are working upon the metal and being rapidly retracted.

Whilel have illustrated the invention in its application to a metal-planer, it is in no wise restricted to such use, but itis applicable to any machine where a variable rotation or reciprocation of an element thereof is desired.

The invention is illustrated in the accompanying drawings, wherein- Figure 1 represents a side view showing a portion of a planer-bed, parts being in section. Fig. 2 is-a view of the opposite side from that shown in Fig. 1, the planer-bed being removed; and Fig. 3 is a plan view.

In thedrawings, A represents the supporting-frame, of a size and shape to support the working parts.

Brepresents the main shaft, mounted in a suitable bearing a and carrying a drivingpulley B, which may be driven by a belt from any suitable source of power to impart a rotary movement to said shaft.

(3 represents the worm, which in the form of my invention shown in the drawings is mounted upon shaft B to turn therewith and to reciprocate along the same.

As above stated, in the present embodiment of my invention the worm C rotates with the shaft B and is movable longitudinally along the same. Provision may be made to secure this result by the usual spline or feather or other suitable means. I have in practice, however, adopted the following as the preferred construction: Near the outer end of shaft B is fixedly secured a spider or frame B having a plurality of arms b, each of which has at its outerend a bearing 1), in which is free to slide a corresponding number of rods 0, secured in anysuitable manner to the worm O, the said rod 0 being preferably projected from a spider or frame 0, having arms 0 substantially corresponding to the spider or frame B and, as shown in the drawings, said spider or frame 0 is formed integrally with or fixedly secured to the worm O.

D represents a driven shaft mounted to rotate in suitable bearings d, and which carries a worm-gear d, mounted fixedly on said shaft and in mesh with and driven by the worm 0. As shown, variable rotary movement is imparted to shaft D through the worm-gear d and worm C by simultaneously imparting to worm O a rotary movement with shaft B and a longitudinal movement along said shaft.

Any suitable means may be adopted to move the worm O along the shaft B, the means shown in the drawings comprising a cam E, which is fixed to the end of a short shaft 6, journaled in a suitable bearing 6 on frame A, the said shaft'carrying a worm-gear e which meshes with and is driven by a worm 0 upon shaft B, which imparts a constant rotating movement to the cam E.

F represents a plunger or rod adapted to have a free reciprocation in a sleeve or bearing f, fixed to frame A, and which at one end carries a fork f, adapted to fit a groove c in a collar or boss on the worm O, the other end of plungerF carrying an antifriction-roller f which bears against and is acted upon by the cam E, whereby a longitudinal movement is imparted to the plunger F and by means of-the fork f to the worm C along the shaft B simultaneously with the rotary movement of said worm C.

The arrangement above described is such that the rotation of the worm C and its 1011 gitudinal movement will impart a variable rotation to the shaft D.

As illustrated in Fig. 1, the invention is shown as adapted to impart motion to the planer-bed P, which is connected by a crankpin 2) to the disk 11 upon the driven shaft D, the crank-pin moving in a slot in the planerbed and being adjustable along the groove in the disk 1), as is usual and common in such machines.

The operation of the invention isas follows: Motion being imparted to shaft 13 by any suitable means, the said shaft causes the rotation of the worms C and C, which in turn impart rotary motion to the cam-shaft e and cam E and the shaft D. The rotation of the cam E causes a reciprocation of the rod F, which by means of the fork f moves the worm G along shaft B, the result being that the shaft D has imparted thereto a rotary movement caused by the rotation of the worm C, which motion is augmented by the outward movement of the worm 0 along said shaft, resulting in an increased speed of rotation of the shaft D as the worm is moved outwardly by the cam E. The cam E, as shown, is a double-throw cam having two short rapid rises and two gradual longer falls, and, as shown in the several views of the drawings, the cam E (rotating in the direction of the arrow, Fig. 1) has moved the worm O outwardly to the limit of its throw. A further and continued rotation of the driving-shaft and the cam E causes the worm G to move backwardly because of the load on the shaft D, which tends to retard the rotation of said shaft and to cause the worm C to travel backwardly, decreasing the speed of the shaft D until the limit of the backward movement has been reached, when a rapid rise of the cam E comes into contact with the roller f on red F and the rod will be quickly moved forward, causing the worm to increase the speed of the shaft D, as before stated. The result of the application of the invention, as shown in the drawings, is that a rapid backward movement is imparted to the bed, with a relatively slow forward movement. It will be noted that the shape of the cam E determines the time at and during which the motion of shaft D is accelerated or retarded, and also the rate of acceleration or retarding of said shaft D, and by varying the shape of the cam the rotation of shaft D may be accelerated or retarded at any desired time, and the increment or decrement may be of any required amount or relative duration and con stant or variable, as desired.

Having fully described my invention and its mode of operation, I desire to state that so far as I am aware of-the state of the art it has never been proposed to impart a variable rotary motion to a machine element from an element rotated at a constant speed by means of gear connections one member of which has a constant rotary movement with the element rotated at a constant speed and an independent longitudinal movement, and that therefore I do not consider the present invention as limited to any particular application or to the details of construction which have been hereinbefore described; but

I claim as novel and desire to protect by Letters Patent of the United States 1. The combination with the driving and driven shafts, of a gear connection between the shafts, means to impart to one member of said gear connection a rotary movement with one of the shafts, and a longitudinal movement independent of said shaft, substantially as described.

2. The combination with the driving-shaft and a worm rotating with and movable along the same, of a driven shaft having a wormgear meshing with the worm on the drivingshaft, and means to impart a longitudinal movement to the worm along the drivingshaft during the rotary movement of said worm, substantially as described.

The combination with the driving and driven shafts, of gear connections between said shafts, and a cam actuated by mechanism independent of said gear connections to longitudinally move one member of said gear connection during the rotary movement thereof, to impart a variable speed to the driven shaft, substantially as described.

4. The combination with the driving-shaft, a worm mounted thereon for longitudinal movement along the shaft, of a driven shaft having a worm-gear meshing with the worm on the driving-shaft, and means actuated by the driving-shaft to impart a longitudinal movement to the worm along said shaft during the rotation of said worm, substantially as described.

5. The combination with the driving and driven shafts, of a worm on the driving-shaft gearing with the driven shaft, and means in dependent of the gear connection, actuated by the driving-shaft, to impart a longitudinal movement to the worm along the driving-shaft during the rotary movement thereof, substantially as described.

6. The combination with the drivingshaft and driven shaft, of a worm arranged to communicate motion from the driving to the driven shaft, and a cam arranged to move the worm longitudinally along said shaft during the rotary movement thereof, substantially as described.

7. The combination with a shaft of a worm mounted to slide along the same fixed projections carried by the worm and shaft, and a rod carried by one of said projections and movable through a bearing in the other, substantially as described.

8. The combination with a shaft, of aworm mounted to slide along the same, fixed projections carried by the worm and shaft, and a sliding connection between said projections, substantially as described.

9. The combination with the driving and driven shafts, of a gear connection between the shafts comprising a rotating and reciprocating worm, means to positively move said worm in one direction arranged to release said worm and permit its return movement by the load, substantially as described.

10. The combination with the driving and driven shafts, of a worin-and-gear connection between the shafts, one member of which is arranged to have a longitudinal movement independent of its shaft, and a plunger arranged to impart the longitudinal movement thereto, substantially as described.

12. The combination with a driven shaft,

a worm thereon fixed against longitudinal movement, another worm thereon free to move along said shaft, of a shaft having a gear connection with the fixed worm, a shaft having a gear connection with the longitudinallymovable worm and connections between the shaft driven by the fixed worm and the longitudinally-movable worm, to impart a longitudinal movement to the movable worm, substantially as described.

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

JOSEPH E. CRISP. Witnesses:

THOMAS H. ANDERSON, A. E. W'HYTE.