Patent GB-1498343-A (GB)
Title: Laminator
IPC: B32B37/22
Filed: 1976-07-14
Abstract: 1498343 Laminating apparatus INTERNATIONAL BUSINESS MACHINES CORP 14 July 1976 [24 July 1975] 29247/76 Heading B5N A laminator for applying a sheet of flexible material cut from a supply web to one face of a rigid panel comprises a member for holding the leading portion of material from the web, first feed means for feeding a panel and stopping it in a position opposite the member, means for operating the member towards and away from the panel to press seal the leading portion of the material to one face of the panel, means for restarting the first feed means to feed the panel with the leading portion of the material attached past rotating calender roll means to press seal the material to one face of the panel as the panel pulls material from the web, second feed means for feeding the panel from the calender roll means and first first feed means, means for stopping the second feed means and the rotation of the calender roll means and the panel as the material is being press sealed, means responsive to the stopping of the second feed means and calender roll means for operating a cutter mechanism to cut a length of material from the web, and means responsive to the completion of the cutting operation to restart operation of the second feed means and calender roll means to complete press sealing of the material to the panel. In a preferred embodiment the laminator is designed to apply the material to each face of the panel, such an apparatus comprising an input elevator 10 into which the panels 11 are stacked and four belt conveyers 12, 13, 14, 15 for transporting the panels, the elevator having U-pusher member 16 reciprocated by an air pusher to eject single panels and being raised as each panel is ejected. The first conveyer section 12 comprises a pair 17, 18 of rotatable rollers entraining a pair 19 of relatively narrow conveyer belts and runs continuously during operation of the laminator, the second conveyer station 13 comprising continuously running rollers 20, 21, 22 and a pair of tensioned, adjustable narrow belts 23 and serving to feed the panels between I.R. lamp heater sections 25 and 26. At the beginning of the second conveyer is a sensor operated switch 27, open when a panel is between air detector nozzles 29 the switch is open but is closed in the absence of a panel. The third conveyer section 14 includes two narrow adjustable belts 32 entrained around two continuously driven rollers 30, 31, two sensor operated switches 33 and 34 being spaced along the section and operating similarly to switch 27, conveyer section 14 feeding the panels to a web applying and severing apparatus comprising upper and lower vacuum members 39 and 391, upper and lower vacuum shoes 40 and 41, upper and lower rotating blade cutters 41 and 411, upper and lower apply rollers 42 and 421 and associated reed or microswitches 43, 44, 45 and 46, the panels being fed from this apparatus to conveyer section 15 including two narrow adjustable belts 49 entrained around continuously driven rollers 47, 48, two sensor operated switches 50, 51 operating similarly to switch 27 being spaced along this section. In operation, power is applied to run the four conveyer sections, a supply of panels is loaded into elevator 10 and a switch on the elevator operated to raise the elevator to the first panel position, member 16 ejecting the first panel on to conveyer 12 and hence to conveyer 13, movement of the panel on to conveyer 13 closing switch 27 which reopens as the trailing edge of the panel clears the sensor and initiates a signal to cause member 16 to eject a second panel on to conveyer 12. The first panel is heated by heaters 25 and 26 and moves on to conveyer 14 operating at a higher speed than conveyer 13, the leading edge of the panel closing the switches 33 and 34, the trailing edge of the panel clearing the sensor of switch 33 opening the switch and initiating a signal to stop conveyer 14 and operate vacuum members 39 and 391. When 14 is stopped, members 39 and 391 are swung towards the panel to apply the leading edges of webs 56 and 57 thereto. As the upper member 39 moves down, switch 46 is actuated to start a short time delay and to initiate a signal to allow upper and lower web tensioning cylinders 58 and 581 to let out web stack, the vacuum members being restored to their normal position at the end of the time delay and switch 45 being actuated to set up an interlock to ensure non-operation of cutters 41, the microswitch 46 being actuated to start conveyer 14. The panel with attached webs is fed further on conveyer 14 until its trailing edge clears switch 34 sensor and reopens the switch to initiate a signal to close the two revolving calender rolls 42 and seal the webs to the panel. The panel passing on to conveyer 15 and continuing until its leading edge closes the switch 50 to initiate a signal to stop the calender rolls and conveyer 15 and to actuate cutters 41, 411 to shear the webs, the upper cutter 41 actuates either of switches 43, 44 to restart the calender rolls and conveyer 15 to feed the panel past the sensor of switch 51, the panel trailing edge reopening the switch and stopping the calender rollers. The upper and lower vacuum members 39, 391 are of Teflon (R.T.M.) coated steel with perforated faces, vacuum being supplied thereto from pipes 66 and 661, the members having curved nose sections and comprising rubber inserts 68, 681 to seal the web edges against the panel. Member 39 extends across the machine audits upper end is journalled by pivot pins 69 in blocks 70 slidable upon vertical rods 72, the lower end carrying cam followers engaged on cam surfaces in blocks 74. Expansion of an air cylinder 73 from the shown inoperative position causes counterclockwise rotation of member 39 about pivot pins 69, continued expansion of 73 when the member 39 is vertical causing downward movement of member 39 towards the panel, member 391 being similar to member 39. Upper and lower cutter mechanisms 78, 781 are slidably mounted on horizontal rods 79, 791 and connected to endless cable 80 wound around pulleys 81, 82, a controllable drive being used to reciprocate the cutter mechanisms across the machine. The webs used may each be of three-ply construction, an outer layer of polyethylene, which is removed to take up rolls 63 and 631, a middle layer of photo-resist material and an outer layer of polyester film.