GB290241A - Improvements in glass cutting machines - Google Patents

Abstract

290,241. Price, W. C., and Price, W. H. G. May 11, 1927, [Convention date]. Cutting glass.-A machine for cutting glass sheets, and particularly for producing rectangular sections or glass tiles, comprises sets of cutters adapted to be reciprocated across a sheet of glass placed on the bed of the machine, and means for preventing the cutters from chipping the edges of the glass. The machine bed, shown in plan in Fig. 1, has two sets of slideways 9 disposed at an angle to one another, usually 90‹. The sheet of glass, 10, rests on adjustable supports 11 clamped to the bed, and stops 13 are provided to act as abutments for the sheet. The cutters are' carried by blocks 17, Figs. 1 and 4, clamped to a bar 15 which is pivoted, in a pair of slide blocks 14 that can be reciprocated along the slideways 9. The cutters 19 are mounted on holders 20 which are flexibly connected by springy steel strips 21 to the cutter blocks 17, and vibration is prevented by damping-levers 23. Each of the cutter bars 15 has secured to one end a lever arm 31, Fig. 7, which has a cam face 39 formed on its free end. A spring-operated trip lever 32 is pivoted to the arm 31 and has a hook 33 adapted to engage a projection 34 on the block 14. A blade, spring 40, secured to the cutter-bar 15, forces the cutters downwards into contact with the glass when the hook 33 is free from the projection 34. The cutters are raised during part of their movement by means of ramps 35, 36, Figs. 1 and 7, disposed in the slideways 9, which engage the cam face on the lever arm 31. A third ramp, 37, engages] the trip lever 32. In use, the operator moves the slide blocks 14 across the sheet 10 from the position shown in Fig. 1, and during this stroke the cutters are held out of contact with the glass, the ramp 35 having raised them, and they are kept in the raised position by the engagement of the trip lever 32 with the projection 34. On the return stroke, the ramp 37 engages the trip 32 and allows the spring 40 to press the cutters down into contact with the glass. The position of the ramps 36 and 37 is so arranged that the cutters are moved downwards gradually, but not until they have passed over the edge of the sheet, thus preventing them from chipping the edge.