US825231A - Reversing mechanism for machine-tools. - Google Patents

Description

No. 825,231. PATENTED JULY-3, 1906.

J. MILEY.

REVERSING MECHANISM FOR MACHINE TOOLS;

APPLICATION FILED DEO.20, 1905.

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No. 825,231. PATENTED JULY 3, 1906. J. MILEY.

RBVERSING MECHANISM FOR MACHINE TOOLS.

APPLIOATION FILED DBO. 20, 1905.

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No. 825,231. PATENTED JULY 3, 1906. J. MILEY. REVERSING MECHANISM FOR MACHINE TO OLS.

APPLICATION FILED DEG-20, 1905,

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'UNITED STATES PATENT OFFICE.

JOHN MILEY, or MANCHESTER, ENGLAND, ASSIGNOR TO CRAVEN BROTHERS, LIMITED, or MANoHEs'rER, ENGLAND.

REVE'R'SIN'G MECHANISM FOR MACHINE-TOOLS.

Specification of Letters Patent.

atenteor July 3, 1906.-

Applioation filedDecember 20, 1905. Serial No. 292,656.

To all whom it may concern.

Be it known that 1, JOHN MILEY, a subject of the King of Great Britain, residing at 12 Mary street, Harpurhey, Manchester, in the county of Lancaster, England, have invented new and useful Improvements in the Reversing Mechanism for Machine-Tools, of which the following is a specification.

This invention relates to improvements in the reversing'mechanism of planing-machines and other machine-tools, cranes, and other belt or rope driven mechanisms, and has for its object to effect the automatic reversal of the main driving-shaft of the machine, crane, or other mechanism without shifting belts from fast to loose pulleys.

In carrying the invention into effect a rocking frame carrying two driven pulleys running in the same direction and a eared reversing-motion is mounted to osciflate upon two trunnion-brackets concentric with the driving shaft or screw to be reversed. This rocking frame is approximately triangular in form, is inverted, andv has its center of movement in, say, the middle of its base, and at each end of the base is a stud or stay bolt, upon each of which at the opposite corners of the inverted base is fitted arevolving sleeve. On one sleeve is keyed one driven belt-pulley and a spur-wheel in gear with a spur-wheel on the driving shaft. On the other sleeve is keyed the other driven belt-pulley and a pinion, gearing through an intermediate or carrier wheel with the aforesaid spur-wheel on the driving-shaft. ed triangular frame is formed or secured toothed quadrants geared with pinions or segments fixed on a shaft which is oscillated by suitable connections from the traveling table or other moving part.

lVhen the base of the inverted trian ular frame is in a horizontal position, both the elts on the driving-pulleys are slack, and consequently no motion is transmitted through the gearing to the driving-shaft. l/Vhen, however, the triangular frame is inclined to one side, the belt on the pulley which is lowered is tightened, and thus the shaft is driven through the gearing in one direction until the triangular frame is oscillated by the connections from the traveling table or other moving part, thus slackening the belt which had been driven and tightening the other belt, which thus becomes the driver and through On the apex of the invert-- the gearing drives the shaft in the reverse direction.

In the accompanying three sheets of drawings, Figure 1 is a side elevation of part of a planing-machine to which my improved reversing mechanism is applied. Fig. 2 is a plan view of Fig. 1 with the reversing mechanism shown in section, and Fig. 3 is an end view of Fig. 1.

In the drawings, a designates a rocking frame carrying two pulleys b a, driven in the same direction by belts.

(1 represents two trunnionbrackets upon which the rocking frame carrying the geared reversing-motion is mounted and free to oscillate. These trunnions are concentric with the driving shaft or screw f to be reversed. This rocking frame a is approximately triangular in form, is inverted, and has its center of movement in, say, the middle of its base and oscillates upon the trunnion-brackets (I. At each end of the base of the rocking frame is a stud or stay bolt h h, which connect together the two end plates of the rocking frame a. Upon the bolts h h are fitted sleeves i i, to which the pulleys b c are respectively secured. On the sleeve i is also secured a spur-wheel k, gearing into a spur-wheel Z upon the driving shaft or screw f. On the other sleeve i is secured the other driven belt-pulley c and a pinion m, gearing, through an intermediate 01' carrier wheel n, with the aforesaid spur-wheel l on the driving-shaft. On the apex of the inverted rocking frame a are formed or secured two quadrants 0, gearing into segments p, fixed upon a shaft 1, carried in the brackets cl.

To a lever 15 upon the shaft 1" is secured a stud a, which serves to connect the lever by a rod o to a lever w, which carries at its upper end two small bowls w e0 The usual adjustable dogs (not shown) upon the table 3 of the planing-machine act alternately upon one or other of the bowls w w and so impart an oscillating movement to the shaft 1". The lever 'w is keyed on a stud 0c, fitted in a stationary bracket y, and upon the squared end of this stud is fitted a handle 2. The drawings represent the base ofthc rocking frame a in the horizontal position and the belts on the drivin -pulleys b and c slack, so that no motionwi lbe conveyed to the planing-machine.

To start the machine, the operative must move the handle zsay to lower it. This will move the lever w and rod y far enough to move the lever t and cause the shaft 1" and segments p, mounted upon, it, to .turn

the rocking frame 60 upon its trunnions d by the quadrants far enough for the driv ing-belt to be drawn tight upon the pulley c adjustable stops, which act alternately upon the bowls w w of the lever w, as described.

In order to increase the speed of the driving shaft or screw f when the machine is cutting, I fit a spur-wheel s on a feather-key in the sleeve i. This wheel is hollowed out, as shown in Fig. 2, and when required to increase the speed of the reciprocating table the carrier-wheel n is moveddown out of gear with the pinion m, when the gear 8 can be pushed along the sleeve i into gear with the carrier-wheel n, which still remains in gear with the wheel Z, fast upon the driving shaft or screw f ,and gives an increased speed to the machine-table.

The direction of rotation of the driving pulleys b c, in connection with the gear-reversing wheels 10, 'm, and n, is such that it automatically supplies the necessary tension for driving and does not require any deadweights, springs, cams, or air-pressure to keep the drivingbelt taut. This can be readily understood by referring to Fig. 1, Where an arrow indicates the direction of rotation of the spur-wheels k and it when the spur-wheel 7c is driving the screw f through its gear Z. The resistance before the screw f can be set in motion tends naturally to force the wheel 7c to travel round the gear Z, and so holds the rocking frame a in position and automatically supplies the necessary tension to keep the belt taut, and a similar action takes place when the reversing-motion comes into play and the pinion m and carrier n become the drivers of the wheel 1 and screw It will be readily understood that instead of proved reversing-motion as applied to a plan ing-machine, it is obvious that it can be readily applied to certain other machine-tools, cranes, or other mechanisms.

What I claim, and desire to secure by Letters Patent of the United States, is

1. In reversing mechanism for machinetools and the like a rocking frame, a shaft carriedon each sidethereof, a driving-pulley on each shaft, a shaft for the tool to'be reversed, a toothed wheel thereon, gears on the first-mentioned shafts gearing with said wheel, a quadrant on the frame, an oscillating shaft, segments thereon engaging with the quadrant to rock the frame and means for oscillating the shaft.

2. In reversing mechanism for machinetools and the like, a rocking frame, a shaft on each side thereof, a pulley on each shaft, a toothed wheel on each shaft, a shaft for the machine to be reversed, a toothed wheel thereon, one of the wheels on the shafts of the frame meshing with said wheel and an intermediate wheel meshing with said wheel and the wheel of the other shaft on the frame, a second toothed wheel on said last-named shaft, means permitting movement of the in-v termediate wheel so as to engage with the second toothed wheel, a quadrant on said rocking frame, a rocking shaft, a segment thereon engaging with said quadrant and means for operating the rocking shaft fromthe machine.

In testimony whereof I have signed my name to this specification in the presence of two subscribingwitnesses.

JOHN MILEY.

Witnesses:

HENRY BERNOULLI BARLOW, HERBERT R. ABBEY.

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