Patent GB-191500505-A (GB)
Title: Sand-papering and Polishing Machine.
IPC: B24B35/00
Filed: 1915-01-12
Granted: 1915-10-14
Abstract: 505. Prims, J. C., Smith, W. F., and Duplex Moulding Sander Co. Jan. 12. Block, rubber, and like a p p a r a t u s .-A sandpapering or polishing machine comprises a bed 1 with a work table 11 along which the work 58, for example moulding, is fed, polishing-blocks 13 being adapted to be reciprocated in opposite directions longitudinally of the work, and the abrasive action of each block thereby -counteracting that of the other to prevent acceleration or retardation of the feed of the material. The blocks are reciprocated by means of connecting-rods 24 driven by cranks 23 on a shaft 20, and this shaft is rotated at a high speed by a belt 106 passi g round a pulley 107 on the shaft and a pulley 105 loose on a countershaft 103 in the machine bed. The pulley 105 has a friction ring 111 whereby it is driven, by means of a friction disk 110, from the main driven pulley 104 of the machine, the friction clutch being brought into operation by sliding the pulley 105 along the countershaft by means of a lever 112 operated by a cam-lever 114. The polishing devices each comprise spaced sides 34 to which are bolted a fixed section 41, and an adjustable section 42 adapted to be moved by an adjusting-screw 48<a> so as to grip the block 36 carrying a shaped abrading-portion 36<a>, between the sections. The polishers are guided by rods 32 projecting from yokes 28 mounted on slideways 27 and adapted to be lifted, to replace &c. the abrading-blocks, by rods 60 operated by treadles 63 which also carry locking- bars 64 whereby the yokes may be maintained in the raised position ; the downward movement of the yokes is adjustably limited by screws 53. The slidways 27 are formed on a bearing- bracket 16 carrying the bearings for the crank-shaft and a casing 17 for the cranks. The work is guided along the table by means of an adjustable guide-bar 68 and a vertically adjustable roller 71 and horizontally and vertically adjustable rollers 72, and it is fed through the machine by upper and lower feed-rollers 76, 77 at the ends of the machine. These rollers are driven through spur gearing by pulleys 88<a> driven by a belt 90 passing round a pulley 102 integral with or secured to the pulley 105, and the rollers 76 are carried by adjustable arms 81 pivoted in bearings 84 on the machine ; these arms may be adjusted to give the desired pressure on work of different thicknesses and may be fixed in theadjusted position by a nut 87 and a washer 86. The lower feedrollers 77 are carried by shafts journaled in eccentric bushings having handles 100, whereby the feed-roller is caused to project in varying degrees above the table. A tension pulley 118 for the belt 90 is carried by a crank-arm on the end of a shaft 116 operable by a handle 119 and adapted to be fixed in the adjusted position. The top of the bed 1 of the machine has a suction chamber 4 with an opening 8 connected to a vacuum suction device, hooded openings 12 being provided above the bed at the back of the polishing-devices; an opening 14 with a cover-plate 15 is provided for removal of dust accumulating in the suction chamber.