US1143679A - Driving mechanism for variable-speed machines. - Google Patents

Description

E. M. WOODWARD.

DRIVING MECHANISM FOR VARIABLE SPEED MACHINES. APPLlC-ATION FILED MAY 19. 1909.

Patented. June 22, 1915.

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APPLICATION FILED MAY 19, 1909.

L1%,@?% Patentedl'une 22, 1915.

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TH E NORRIS FETERS 60.. FHOTO-LITHO.. WASHINGTON. cry 6 DRIVING MECHANISM FOR VARIABLE-SPEED MAUI-TIMES.

intents.

Specification of Letters Patent.

Patented June 22 1915.

Application filed May 19, 1969. Serial No. 497,136.

To all whom it may concern:

Be it known that T, EDWARD M. WOOD- WARD, a citizen of the United States, residing at l/Vorcester, in the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in Driving Mechanism for Variable-Speed Machines, of which the following is a specification, accompanied by drawings, forming a part of the same, in which Figure 1 represents an end elevation of a driving mechanism embodying my invention. Fig. 2 is a plan view of the same, and Fig. 3 is a detachedview of the countershaft, with the pulleys thereon shown in sectional view.

Similar reference letters and figures refer to similar parts in the dilferent views. The object of my present invention is to provide a driving mechanism for that class of machines which require to be driven at diflerent speeds according to the varying conditions of the work performed and, in the accompanying drawings, 1 have shown my invention as embodied in a driving mechanism applied to a metal planing machine for reciprocating the planer table at different speeds, according to the character of the work or the length of the stroke, the particular object of the invention being to increase the range of variation in speed over other devices now employed for that purpose without the use of gearing, and my invention consists in the construction and arrangement of parts as hereinafter described and pointed out in the annexed claims.

In operating the reciprocating tables of metal planing machines, it is desirable to impart to the table different speeds during the cutting stroke according to the character of the work performed, and it is also desirable to impart to the table difierent speeds during the return stroke according to the length of the stroke. These variations in speed have heretofore been produced by a system of gearing interposed between the driving power and the reciprocating table, and it has also been proposed to impart power to the reciprocating table through belts or wrapping connections with pulleys running at diiferent speeds, thereby avoiding the expense of construction, friction, and noise incident to the use of gearing.

lvly present invention relates to that class of driving mechanism by which power is applied by belts or wrapping connections,

and by my improvements T am able to secure a greater range in the variation of speed during the cutting stroke of the table of a metal planing machine, and also a variation in the speed during the return stroke. 1 am also able to control the variation in speed of either the cutting or return stroke independently of each other.

Referring to the accompanying drawings, 1 denotes a planer bed and 2 the reciprocating table, having suitable geared connection, not shown, with a shaft 3 journaled in the bed of the machine in the usual and well known manner, and any desired speed of which the driving mechanism is capable is imparted to the reciprocating table 2 by a variation in the speed of the shaft 3. Attached to the shaft 3 are pulleys r and 5, having corresponding loose pulleys 6 and 7, to receive the driving belts 8 and 9 when the machine is not in use. v pon the opposite end of the shaft 3 is attached a pulley 10, and carried upon the shaft is a corresponding loose pulley 11 to receive a driving belt 12. T he belts 8, 9 and 12 connect their respective pulleys with driving pulleys upon a counter-shaft 13, the belt 12 being crossed so as to impart a reverse motion to the shaft 3. The countershaft 13 is journaled in suitable hangers 11 above the metal planer, and in position to be conveniently driven by belt connections from a main shaft 15, which is rotated from any convenient source of power through a belt pulley 16. Attached to the main shaft 15 are driving pulleys 17 and 18, having belt connections 19 and 20 with pulleys carried upon the countershaft 13. The relative sizes of the pulleys connected by the driving belts 19 and 20 are such that the countershaft 13 will be driven at a higher rate of speed by the belt 19 than by the belt 20.

The counter-shaft 13, which is shown de tached in lFig. 23, carries the pulleys 21 and 22 attached to the countershaft and the loose pulleys 23, 2a and 25. The loose pulley 2% is a stepped pulley, having the steps 26 and 27 of different diameters. The loose pulley 25 is a companion to the step 27 and the loose pulley is a companion to the tight pulley 22. The hub of the pulley 24- is provided with a clutch member 28, which is provided with a sliding clutch member 29, havmg a spline connection with the countershaft 13 by means of the spline 30, and capable of a longitudinal movement on the countershaft in order to carry the clutch members into and out of engagement by means of a fork 31' and a shipping lever 32, in the usual manner in operating clutch devices ofthis class. V

Motion is imparted to the table 2 during the cutting stroke by means of either of the driving belts .8 or 9, which run upon the loose pulleys 6 and 7 and are capable of being shifted by suitable belt shipping mechanism, not shown, upon the tight pulleys 4 and5. The belt 8 runs upon the larger step 26 and the belt 9 upon the smaller step 27 of the pulley 24, so that, when the shaft 3 is driven through the belt 8, it revolves at a higher "rate of speed than when driven through the belt 9. Two speeds may, therefore, be given to the table 2 as power is imparted through either of the belts 8 or 9 with the pulley 24 runningat a constant speed. Two different speeds may, however, be imparted to the pulley 24 first, by drivlng the pulley 24 by the belt 20 on the smallerstepv 27 of the pulley 24 or, second, by carrying the belt 20. upon the loose pulley 25 and connecting the pulley 24 with the shaft 13 by means of the clutch members 28 and 29, and driving the shaft by means of the belt connection 19 between the pulley 17 on the main shaft 15 and the tight pulley 22 on the shaft 13. The pulley 24 will then be rotated from the shaft 13 at a higher rate of speed than by means of the belt 20, thereby increasing the'velocity of both the belts 8 and 9. V V

I thereby securetwo initial speeds of the pulley 24 one, when driven by the belt 20 and the other when driven from the shaft 13, and also two variations of speed between the pulley 24and the shaft 3 due to the difference in diameter between the steps 26 and 27, enabling the reciprocating table 2 to be driven at four different rates of speed during its cutting stroke. By carrying the belt 19 upon the loose pulley 23, driving the pulley. 24. by the belt 20 and engaging the clutch members 28 and 29, I am enabled to drivethe countershaft 13 at a speed determinedby the velocity of the belt 520. I consequently obtain two. difi'erent speeds of the pulley 21, by which the shaft 3 is reversed through the crossed belt 12.

r the above described arrangement of pulleysand belts, I obtaintwo different speeds for the reverse movement of the shaft 3,, giving two differentspeeds for the return stroke of the table and four difierent speeds for the cutting stroke of the table through the belts 8 and 9. The belt shipping mechanisms for controlling the belt 12- fordriving the table upon its return stroke,

and the belts Sand 9 for moving the table upon its forward or cutting stroke are not shown in the accompanying drawings, as they may be of the usual type of belt shipping devices now employed on metal planing machines and, in practice, these belt shipping mechanisms are usually controlled automatically by the movement of the ta- .ble 2.

speed than those obtained by the steps 26 and 27. For example, if the pulley 24 were provided with three steps carrying three driving belts, with a corresponding increase of tight and loose pulleys upon the shaft 3, three separate speeds could be obtained with the constant speed of the driving pulley 24, and, with the two changes already noted in the speed of the pulley 24, a selection of six different speeds may be made for the cutting stroke of the table.

I claim,

1. In an apparatus of the class described, a main shaft, a countershaft, a stepped pulley running loosely on said countershaft, and having a peripheral driving surface coextensive with one of its steps, a belt connection between said driving surface and the main shaft for establishing at will a predetermined driving ratio between said main shaft and said stepped pulley, secondary means for driving said stepped pulley from the main shaft at a different speed, a driven shaft, and means for rotating said driven shaft from the different steps of said stepped pulley.

2. In an apparatus of the class described, a countershaft, means for rotating said countershaft, a stepped pulley, with steps of different diameters, running loosely on said countershaft, a loose pulley on said countershaft having the diameter of one of the steps of said stepped pulley and arranged to receive a belt from said pulley, abelt connection for rotating said stepped pulley and operative with respect to a driving surface thereon which is a continuation of one of the steps thereof, means for operatively connecting said stepped pulley and said countershaft, a driven shaft, and means for rotating said driven shaft separately from each step of said stepped pulley.

3. In an apparatus of the class described,

the combination with a main shaft running ing belt, a pulley loosely mounted on said driven shaft from each step of said stepped countershaft adjacent to said belt receiving pulley. surface, and having the same diameter as said step, a clutching mechanism adapted to EDWARD WOODWARD' be operated at Will to rotatably connect the Witnesses:

hub of said pulley with said countershaft, a PENELOPE COMBERBACH,

driven shaft, and means for rotating said NELLm WHALEN.

G'opies of this patent may "be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

It is hereby certified that in Letters Patent No. 1,143,679, granted June 22, 1915,

upon the application of Edward M. Woodward, of Worcester, Massachusetts, for an improvement in Driving Mechanism for Variable-Speed Machines, an error appears in the printed specification requiring correction as follows: Page 2, line 113,

'after the Word said insert the Word stepped; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 27th day of July, A. D., 1915.

[SEAL] R. F. WHITEHEAD,

Acting Commissioner of Patents.

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