Patent GB-1121152-A (GB)
Title: Improved cutting machine
Inventor: WILLIS-OWEN RICHARD BRYN
IPC: B26D1/20
Filed: 1965-12-17
Abstract: 1,121,152. Cutting webs. PHILIPS RECORDS Ltd. 28 Nov., 1966 [17 Dee., 1965], No. 53634/65. Heading B4B. A machine for cutting a web 5 of flexible material to which is bonded a succession of sheets 6 of flexible material which are arranged in overlapping formation comprises a knife 17 movable in a first plane and rollers 9, 10 for feeding the web and sheets past the knife in a second plane parallel to the first plane, a pivotally-mounted member 33 being arranged subsequently to divert the leading sheet on the web from the second plane but permit the second sheet to continue moving in this plane so that a fold 56 is formed in the web between the leading and second sheets, means being provided for moving the knife so that it cuts through the web along the fold. The cut-off web portions and sheets bonded thereto may be used in the manufacture of front or back covers for the sleeves of disc gramophone records. The ends of the knife are connected to arms 21a, 25a, Fig. 1, of pivotally-mounted two-armed levers 21, 25, the other arms 21b, 25b being connected respectively to a pneumatic piston-and-cylinder device 23, 24 and to a tension spring 27. As the knife reaches the end of its cutting movement, the lever 21 actuates a microswitch 28 to de-energize a solenoid valve associated with the cylinder 24 with the result that the knife returns to its original position and as it enters this position, the lever 25 actuates a microswitch 31 to cause actuation of a pneumatic piston-and-cylinder device 38, 39 operatively connected to the member 33. The device 38, 39 is controlled by microswitches 40, 44 responsive to the operation of the member 33. A gap 33a, Fig. 3, is provided between the edge 33b of the member 33 and the edge 32b in an opening 32 in a table 1. The member 33 is movable from the rest position, Fig. 3, to the raised position, Fig. 4, and back to the rest position, Fig. 5, and in its movement from the Fig. 4 position to the Fig. 5 position, it diverts the then leading sheet through the gap 33a. Rollers 18, 19, Fig. 3, engage the sheets 6 to hold the web 5 in contact with one side of the knife, the rollers being carried by lugs 20 on spring-influenced pivotally-mounted levers 14 connected by a cross-rod 15, Fig. 1. The operation of the piston-and-cylinder device 23, 24 is controlled by means of a photoelectric cell 49, Fig. 2, and a lamp 48 which is arranged to direct a light beam on to the cell through a slot 33c in the member 33 such that the beam is interrupted by the leading edge of the second sheet on the web to cause operation of the knife when the fold 56 has been formed between the leading and second sheets. Before the machine is started, the leading edge of the leading sheet on the web is manually inserted down the gap 33a. The feed rollers 9, 10 are driven at a fast forward speed and the material travels down through the gap 33a and is guided by a deflector plate 53, Fig. 2, to a conveyer 54. The fast forward speed of the material is maintained by an electric timer until the second sheet on the web reaches the feed rollers 9, 10. The speed of the rollers 9, 10 is then automatically reduced for the cutting operation. After this has been completed and the second sheet on the web diverted by the member 33 through the gap 33a, the speed of the rollers 9, 10 is again increased for a repetition of the above cycle of operations. In a modification. Figs. 6 and 7 (not shown), the member (33) is adjustable to vary the width of the gap (33a).