US1308610A

US1308610A - Plamooraph co

Info

Publication number: US1308610A
Authority: US
Publication date: 1919-07-01
Anticipated expiration: 1936-07-01

Description

c. R. TOWNSEND.

ENDLESS BAND GRINDING AND POLISHING MACHINE.

APPLICATION FILED MAY 1- I917.

Patented July 1, 1919.

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PLANO RAH C. R. TOWNSEND.

ENDLESS BAND GRINDING AND POLISHING MACHINE.

APPLICATION FILED MAY 1. 19!]- Patented July 1, 1919.

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THE COLUMBIA PLANOGRAPN $0.. WASHINGTON. b. C.

CHARLES RALPH TOWNSEND, OF BIRMINGHAM, ENGLAND.

ENDLESS-BAND GRINDING AND PGLISHING MACHINE.

Specification of Letters Patent.

Patented July 1, 1919;

Application filed May 7, 1917. Serial No. 166,984.

To all whom it may concern:

Be it known that I, CHARLES RALPH TowNsnND, subject of the King of Great Britain, residing at Caxton House, Great Charles street, Birmingham, England, engineer, have invented certain new and useful Improvements in Endless-Band Grinding and Polishing Machines, of which the following is a specification.

This invention relates to grinding and polishing machines of that type in which an endless band, having its outer surfaces formed or provided with grinding material, runs over two pulleys, one adjacent to each end of a rigid table, and one stretch of said band travels across such table. The chief object of the invention is to provide means to automatically separate the two pulleys over which the endless belt runs in a straight line, which means is always in action whether the'pulley shafts are parallel or slightly inclined one to the other without bringing the endless band into contact with the table.

The invention is represented by the accompanying drawings applied to a machine having a vertically disposed table.

Figure 1 is a side elevation.

Fig. 2 is an end section.

Fig. 3 is a longitudinal sectional detail of the means for slightly inclining the axis of the movable pulley, and

Fig. 4 is a front elevation with the work support removed.

The frame of the machine comprises the based and the elevated part a to which latter at a is detachably and transversely adjustably secured the table 0 over which the one stretch of the endless band d runs from lower and upper pulleys f and g. The lower pulley f has stationary bearings at a a within the frame. The endless band (i is indicated by a dotted line in Fig. 1 and Fig. 2 only, same not being in position in Fig. 4.

The upper pulley g has bearings one each side said pulley within brackets g 9 carried by tubes h and 11 disposed one each side the table 0 to slide in lug extensions h 72, and i i of the machines frame part (1 such straight line sliding movements being parallel with each other and with the surface of the table. Said tubes are jointedly connected at h and i with the brackets g 9 By sliding the tubes h and 71 together within the lug extensions the pulleys f and 9 may be separated farther, to thereby put the necessary stretch and tension upon the endless band (i.

This stretching and tensioning is automatically arranged for from the operation of the weight w. Collars and m are oppositely fixed one on each tube, and are, by pivoted links y' m connected with swinging arms n and 0 of a transverse rocking shaft 8 having bearings within the machines frame, a and to which is connected a long arm .12 carrying the weight w, whose position can be adjusted along said arm and then fixed by suitable means such as a set screw 00 The weight normally operates on the rocking shaft, and, through the short arms, links, and collars, exerts a parallel and even sliding action upon the two tubes h and i, carrying the bearings of the pulley g from the machines frame, in such manner that the machine has a large amount of movement separating the two pulleys f and o to accommodate a larger range in the different sizes of endless bands, and to automatically tension any of such bands up to its full life, and without any other device except the two pulleys f and g, and the surface of the table 0, making physical contact with the endless band.

To slightly incline the axis of the movable pulley g the collar m is provided with a screw-threaded bore m to receive an externally screw-theaded sleeve 2? revolubly fitted over the tube i between two additional collars n and 12 fast on the tube. This sleeve t is adapted for revolution by hand, using the collar m as a screw box to bodily slide the tube 71 a distance quite independent of any operation of the weight m, which has the effect of inclining the axis of the pulley g, the jointing of the tubes at h 2' to the brackets g 9 being necessary when this part of the invention is used. After setting the inclination of the axis of the pulley g the operation of the weight 00 causes all the collars j, m, a, and o to move as one piece with the tubes h and z', which always move parallel and together.

It is a constructional feature to arrange the axes of the tubes 7L and i in the same plane as the axes of both pulleys 7 and g.

A swinging catch to is carried by the slidable tube 2', and is adapted for engagement with a stud w fixed to the machines frame, for the purpose of holding the pulleys f and advance said slide to and from the band a and table 0. Upon this middle slide is mounted a top slide 9 to form a rest surface for work or a carrier for work. This top slide can be moved by any suitable mechanical devices truly in a direction at right angles to the movement of the middle slide 7, namely, across the running band d. If the saddle 3 is tipped at an angle the work surface of the top slide 9 is also tipped to the same angle.

The elevated part a is provided at 10 10 with lateral projections to which complemental projections 0 0 of the table are rigidly clamped by the pins 11 11. The

pieces 10 10 are formed with slots 12 within:

which the pins 11 may be adjusted. By these devices the table 0 may be laterally adjusted on the machines frame to enable either of its longitudinal edges 13 13'tobe set to. the adjacent edge of the endless band d.

Having now described my invention what I claim and desire to secure by Letters Patent is 1. In an endless band grinding and polishing machine, the combination of two end pulleys over which the band runs, a table ar ranged between the two pulleys and over which one stretch of the band travels, a pair of rods carrying one of said pulleys, one at each end of said pulley and arranged, respectively, adjacent the longitudinal edges of said table and mounted for movement in a straight line longitudinally of said table, and a weight automatically operating on said rods to normally separate the twopulleys for tensioning the band and maintaining same, substantially as described.

2. In an endless band grinding and polishing machine, the combination of two end pulleys over which the band runs, a table arranged between the two pulleys and over which one stretch of the band travels, means carrying one of said pulleys and arranged to slide in a straight line longitudinally of the table, a transverse rocking shaft, means connecting said rocking shaft to said slidable means to impart movement to the latter when said shaft is rocked, and a weight tending to rock said shaft to automatically separate the two pulleys for tensioning the band and maintaining same, substantially as described.

3. In an endless band grinding and polishing machine, the combination of two end pulleys over which the band runs, a table arranged between the two pulleys and over which one stretch of the band travels, a pair of rods carrying the movable pulley, one mounted adjacent to each longitudinal edge of the table, and arranged to slide in a straight line longitudinally of the table, and one of which is lengthwise adjustable to incline the aXis of the movable pulley, and a weight automatically operating on said rods to normally separate the two pulleys for tensioning the band and maintaining same, substantially as described.

4. In an endless band grinding and polishing machine, the combination of two end pulleys over which the band runs, a table arranged between the two pulleys and over which one stretch of the band travels, a pair of rods carrying the movable pulley, one adjacent each of the longitudinal edges of the table, and mounted to slide in a straight line longitudinally of the table, one of said rods being provided with a pair of collars, a screw-threaded sleeve revolubly fitted over said rod between said collars, and a weight automatically operating on said rods, in the one case through the sleeve, to normally separate the two pulleys for tensioning the band and maintaining same, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

CHARLES RALPH TOWNSEND.

Witnesses Gno. FUERY. D. LEAKER.

Copies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G.