US131051A - Improvement in head-blocks for saw-mills - Google Patents

Description

J. CAIN.

ead-Blocks for Saw-Mills.

Patented Sep. 3,1872.

Improvement in No. 131,051.

gttum AM FIIOTU-LITHOG/YAPH C mun 0550mm? PROCESS] UNITED STATES PATENT QFFICE.

JOHN GAIN, OF GREENVILLE, PENNSYLVANIA, ASSIGNOR TO HIMSELF AND JOSEPH W. EBERMAN, OF SAME PLACE.

' IMPROVEMENT IN HEADfBl-OCKS FOR SAW-MILLS.

:Specification forming part of Letters Patent No. 131,051, dated September 3, 187,2.

Specification describing a new Improvement in Head-Blocks for Saw-Mills, invented by JOHN GAIN, of Greenville, in thecounty of Mercer and State of Pennsylvania.

In the accompanying drawing, Figure 1 is a top view of my improved apparatus. Fig.

2 is a vertical longitudinal section of the same.

'ing shaft, which is worked bylever and ratchet-and-pawl connection to set the head and tail blocks. The invention also consists in combining with said shaft an eccentric rotary index, and arranging thereon a friction-ring and clamp, all as hereinafter more fully described.

In the accompanying drawing, the letter A denotes the shaft, which is hung in proper bearings at the back part of a saw-carriage, and reaches with its ends behind the head and tail blocks, connecting with the elbows thereon by gearing or otherwise, so that when the shaft A is revolved in one direction they will be moved forward, and backward when it is revolved in the opposite direction. Two ratchet-wheels, a and b, are mounted near to each other upon the shaft A, and near to them, respectively, are hung upon the shaft loosely two disks, d and 6. These disks connect, one above, the other below the shaft, by rods f g, with the.crank of a rock-shaft, z, that is operated by a lever, B. The two disks carry springpawls h h, that bear on the edges of the ratchet-wheels a and b, as indicated in Figs. 1 and 4. By vibrating the lever B on its rock-pivot the disks will be oscillated in opposite directions on the shaft A, and will swing their pawls along the ratchet wheels, respectively. That pawl which is drawn toward the rockshaft islips loose on its ratchet-wheel; but the other, moving away from the rock shaft, engages in its ratchet-wheel and turns the shaft. Thus, as the pawls are alternately moved in opposite, directions, the shaft A will receive intermittent rotary motion to feed the log, by means of the elbows on the head and tail blocks, steadily forward. When the head and tail blocks are to be drawn back to admit a new log, the pawls h h must both be thrown out of gear withtheirrespective ratchet-wheels, so that the shaft A may be revolved in the opposite direction to effect such purpose. A shaft, 0, hanging in a frame, D, that is, at ll, hung to the shaft A, is, by bevel-wheels m m, connected with the said shaft A, as shown in Fig. 1. The shaft 0 carries a friction wheel,

a, at its outer end. When the shaft Ais used to feed a log in manner above specified, the frame D, carrying the shaft 0, is held horizontal by a lever, E, which is pivoted to avertical post, 0, of the saw-carriage frame F, and rests on a stop, 11, as shown in Fig.5. But when the pawls are thrown out of gear the lever E is swung clear of the stop 1) and allows the frame D of the shaft 0 to drop into the inclined position which is shown in dotted lines in Fig. 5,- until the friction-wheel it strikes a stationary rail, q, placed under it immovably. When the carriage is moved the wheel n, rolling on the rail q, will be revolved, and thereby also the shafts C and A, the latter in direction proper for withdrawing the head and tail blocks to admit a new log. The register ing apparatus consists, principally, of a cylin drical drum, G, which is hung between two plates, 'I and s, that are rigidly affixed to the saw-carriage. The drum G is open-ended, and is held on circular shoulders of the plates 1* s, as is clearly shown in Fig. 2. It embraces the shaft A eccentrically, and has internal gearing t, into which a pinion, u, that is mounted upon the shaft A, engages. Thus, when the shaft A is revolved the drum is also turned, but slower. Around the circumference of the drum aremarks with figures, 11 1, 222,333, 850., all spaced, so that when the drum, for example, is moved to bring one mark 1 to the longitudinal position previously occupied by the mark 1 next to it, the shaft A will be turned so much as to feed the log one inch; the same, in equal manner, with the other marks, the spaces 2 corresponding with a feed of two inches of thelog the marks 3 with a feed of three inches, and so forth. To enable the necessary observation, a bar, H, is fastened to the edges of the plates 7" s, parallel to the axis of the shaft A. Its straight edge constitutes the gage on which the position of the marks on the drum can be observed. Therefore, when it is desired to feed the log a certain distance at a time, theleverB is operated until the changed position of the graduated drum indicates that the log has been fed such certain distance. In order to admit of a still finer degree of subdivision of the feed, or of irregular feeding, a graduated scale is marked on the edge of one of the plates r s. A ring, 20, embraces the drum near the plate so marked, and can, by a lever, w, and clamp-spring y, be drawn so tight on the drum as to be carried around with the same. A finger or point, z, is formed on the ringw close to the marked edge of theplate r or 8. When the drum is turned by the means above described the degree of motion can be observed with great nicety by the finger z moving along the graduated edge of r or s. The ring 20 is provided with a handle, a so that it may be turned into suitable position.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent 1. The log-setting apparatus, composed of the shaft A, ratchet-wheels a b, loose disks d e, rods f g, pawls h h, rock-shaft i, and lever B, all arranged to operate substantially as herein shown and described.

2. The shaft G, hanging in the vibrating frame D, and carrying ,the friction-wheel 12, when arr nged to gear into the shaft A, substantially as herein shown and described.

JOHN (JAIN.

Witnesses:

WM. BUCK, F. BOYER.

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