Patent GB-1381343-A (GB)
Title: Slide covers and method and apparatus for manufacturing the same
IPC: C03B33/023
Filed: 1972-03-17
Abstract: 1381343 Glass cutting machine PROPPER MFG CO Inc 17 March 1972 12587/72 Heading C1M Glass slide covers of predetermined length and width are cut from an elongated blank of the width required which is fed over a stationary transverse anvil edge till the required length is beyond the anvil, the stopped blank then being scored across the blank above the anvil edge, tapped beyond the anvil edge to break the blank at that edge to form a slide cover which is received on a stationary inclined surface down which it slides to a collecting location, feeding of the blank then being resumed. Glass blanks 16 are fed by endless belts 18, 20 from a stack under a weight 34 against a gate 38 allowing single feed only. The blank is held in correct position by rubber rollers 82 and 62 while being polished by brushes 50 and while being cut at position 60, respectively, and in between by a weight bar 86. The brushes 50 are driven by motor 52 in a direction contra to the feeding direction of the blanks 16. The hold down roller 62 is mounted by arms 64 pivoted at pins 66 and connected at their other ends to a rod 70 urged upwardly by a spring 72. Cutting.-At the cutting position 60, an anvil 96 with bevelled edge 98 underlies a scoring tool 102 carried by an assembly 104 pivoted at 106 to a carriage 108 slidable back and forth on rods 110 across the blanks 16. Reciprocation of carriage 108 is effected by a rod 130 connected to a pin 132 on a rotary crank disc 134 driven by chain 142. The rod 130 carries a pin 144 which engages a lever 146 pivoted at 148 to the carriage 108 and urged against the pin 144 by a spring 152, the lever 146 carrying a bolt 150 which engages the upper rod 118 of assembly 104, the arrangement being such that when the pin 132 of disc 134 is below the axis of its shaft 136, the bolt 150 is pressed against rod 118 to move it to the dot-dash position, when the scoring tool 102 is inoperative and when the pin 132 is above axis 136 (i.e. on the forward stroke of carriage 108), the assembly 104 is pulled by a spring 120 against a stop screw 124 at which position the scoring tool 102 is operative. Breaking off.-Immediately past cutting position 60, a hammer 178 is pivoted at 180 to an under-plate 174 secured to one end of a lever 158 supported on a pin 160, the other end having a stepped portion 162 held by a spring 262 in engagement with a rotary pin 164 on a crank disc 166 on a driven shaft 170. The shafts 136 and 170 are interconnected by the chain 142 and the positions of pins 132 and 164 are such that during the return stroke of carriage 108 after cutting, the pin 164 engages lever end 162 to swing the hammer 178 into engagement with the second blank to tap the cut off cover length 36 on to a downwardly inclined plate 182 which guides the cover 36 to a receptacle 184. Removal of cover.-Apparatus for counting the number of covers may be provided, which will operate a switch to stop the machine and which will restart when the covers have been removed. Alternatively, and as shown, stoppage may be effected by a weighing device 192, the receptacle 184 being mounted on a support 194 fixed to the balance beam 196 pivoted at 198 and with one or more weights 200 secured by screws 202 to give the required balance, at which point the beam 196 engages the arm 204 of a switch 206 to stop the machine. The operator replaces the filled receptacle 184 with an empty one and the switch arm 204 is released to restart the machine. Operation.-A driven shaft 214 with clutch ends 222 and 220 lies between a clutch 212 on shaft 170, which operates the cutting mechanism and a clutch 32 connected to the belts 18, 20 via gear 30, shaft 28, and chain 26 over sprockets 24 on the belt shafts, the clutches 32 and 212 being connected alternately to feed the blanks 16 and to score the stopped blank. The shift of shaft 214 between the clutches is effected by shift forks 228, 230 engaging collars 224, 226, the forks being pivoted at 232, 234 and connected to a rod 236 coupled to the piston-rod 244 of a double acting cylinder 246. The cylinder is under the control of a switch 258 operated when the leading edge of a blank 16 connects with a switch arm 256 at the required distance beyond the cutting position, to stop the feed of blank through clutch 32-220 and initiate the cut through clutch 222-212. Shaft 214 is driven by the engagement of a rubber friction wheel 218 by a friction wheel 266, driven from motor 270. Motor 270 is mounted on a tiltable support 272 and in its normal position, the wheels 266 and 218 are engaged, but when the weight switch 206 is operated, the support is tilted and the wheels are disengaged, to stop the machine operation.