Patent GB-795836-A (GB)
Title: Glass break-off machine
IPC: B65G49/06
Filed: 1956-06-20
Abstract: 795,836. Glass manufacture. AMERICAN WINDOW GLASS CO. June 20,1956 [June 29, 1955], No. 19070/56. Class 56. In an apparatus for detaching and removing a sheet of flat glass from an upwardly travelling transversely-scored ribbon of glass, in which the glass to be detached is engaged by vacuum cups on a normally vertical framework which is swung for the break-off movement into a horizontal position, the cups are slidable relatively to the said framework which is held against downward movement when it is vertical and is held against horizontal movement when it is horizontal. As shown, the glass ribbon 30 is scored by a tool 40 carried by a cage 38, as described in Specification 725,894, and is held when properly positioned by vacuum cups 114 which are guided for limited movement along the framework which comprises guides 132, 134, 136, 138. The cups 114 are each mounted on a tube 164 slidable in a block 160 carrying rollers 162 which bear against the guides 132, 134 or 136, 138. A spring 170, shrouded by a sleeve 172, normally urges the cup towards the glass. The cups are assembled as a unit by connecting-bars 128 which screw into the blocks 160, and the lowest cup tube 164, on each side of the unit, is connected at 176 to one end of a chain 140 the other end of which is urged upwardly by a spring 146 whereby the weight of the vacuumcup unit is counterbalanced. The cups are presented and adhered to the glass as it approaches the place of separation, and are carried upward for a short distance by the rising glass. After the glass has been broken off, the additional weight transferred to the cup unit is held by a pawl 186 engaging a toothed member 190 on the guide 134, the pawl being released by a roller-ended arm when the unit is approaching its horizontal position. An oppositely acting pawl 192 engaging a rack 196 on the guide 132 is operated by gravity. As the unit swings towards its horizontal position, the pawl 192 is engaged with the rack and prevents the spring 146, which in the horizontal position is virtually unopposed, from continuing the movement of the vacuum-cup unit on the guides. The apparatus is carried by a bed 12 supported on a surface, e.g., a concrete floor, by casters 26, the bed being locked in operative position by a pin 80 which is projected into or withdrawn from a hole in the floor by a handle 76 and toggle linkage 78. The guides 132, 134, 136, 138 are pivoted at 196 to tie rods 90 pivoted at 88 in a carriage 86 which is mounted, for limited horizontal movement towards and away from the glass, on rods 84 which slide in bearings 152 secured to the bed 12. The carriage 86 is moved by hydraulic piston motors 87, whilst the swinging of the guides, and the cup unit therewith, from the vertical to the horizontal position is effected by the combined action of the retractive hydraulic motors 102 and the pivoted tie rods 90, 92, this action resulting in a quick initial upward and lateral movement of the severed glass away from the edge of the parent ribbon. The swinging glass-holding means eventually lies beneath the level of casters 48 on the bed 12, on which casters the glass is laid, the vacuum in the cups being broken simultaneously. The operator then slides the glass away to permit the swinging means to return to receive the glass next to be severed. The cycle of movements of the apparatus is initiated by the closing of a switch which may be effected manually, or automatically by the cutter's cage 38 completing a score in the glass. The completion of the circuit operates, in a manner modified by the contact of mechanical parts of the apparatus with limit switches, L10, L11, L12, L13, and by timedelay relays, solenoids some of which are connected to piston valves controlling the admission or exhaust of hydraulic fluid to or from the motors 87, 102 operating the sliding of the carriage 86 and the swinging of the vacuum cup guides ; the vacuum cups themselves being connected with or disconnected from a vacuum pump by the other solenoid.