Patent GB-190014954-A (GB)
Title: Improvements in Sand-papering Machines.
Filed: 1900-08-21
Granted: 1900-11-10
Abstract: 14,954. Lake, H. H., [Smith Machine Co., H. B.]. Aug. 21. Sandpapering, machines for. The wooden or other articles to be treated are passed under the sandpaper rollers 4 by means of an endless-band conveyer 3. This conveyer consists of a series of bars 20, jointed together in an endless chain which works over chain-wheels 16, 18. Each bar is provided with a resilient facing, composed of conical plugs of rubber &c. inserted in holes in a plate which is screwed on, and is formed at each end with two pairs of lugs for the joint pins ; the pins have rollers 19 which engage the teeth of the wheels and, together with additional rollers 192, run upon tracks 22 on the table 2 ; the tracks 22 extend beyond the track 21, upon which the bars themselves slide ; this feature, together with the fact that the pitch of the pins is as great as or greater than the width of the bars, serves to prevent any buckling of the chain between the wheels and the ends of the track 21. The table 2 is raised and lowered by means of four screws 40, which pass through nuts 49 seated in boxes 52 secured to the table ; the nuts are pressed out of the boxes by springs, and are held in place by screws, so that they may be raised and lowered in the boxes for levelling. The screws are geared by bevel-wheels and horizontal spindles to a pinion loose on the shaft 5, but adapted to be clutched thereto, or to a loose pinion thereon, which is driven in the reverse direction by a bevel gear train, for the purpose of working the screws in one direction or the other. The sandpaper rollers are each carried in a pair of arms 56, pivoted on the frame by means of eccentric pins 55, which may be turned for levelling the roller. A shaft 59, which extends between and is supported in the ends of each pair of arms, carries eccentrics 60 which work in slide blocks fitted to the frame ; by turning the shaft, by means of a worm and wheel at one end, the sandpaper roll may be raised or lowered. The rollers receive an axial reciprocating motion by means of eccentrics on the spindle 28, and levers 77 which are forked to embrace the roller shafts ; each shaft has, between two fast collars, a loose collar 79 having lugs between which and the acting faces of the forked end of the lever springs are interposed. Each roller consists of a pair of bosses and a cylindrical shell in which is a longitudinal slot. The sheet of sandpaper is clamped at one end between a pair of angle-irons fixed to and extending along one side of the slot, and at the other end between a similar pair of angleirons secured to a bar 68 adapted to move to and fro in the slot and carried by a pair of spring arms ; the spring arms are each secured to a boss loose on the roller shaft, and extend round an eccentric shaft 72 journalled in the roller bosses, so that, by turning this shaft, by hand. the sandpaper can be drawn tight upon the roller. Spring catches are provided for the eccentrics. The articles, as they pass from under the rollers, are dusted by a rotary brush 85, supported by arms on a shaft 88, which is also provided with an adjusting-lever.