GB1374111A - Cutter unit and a machine utilising the unit for cutting rectangular blanks form a sheet - Google Patents

Abstract

1374111 Shearing METAL BOX CO Ltd 26 April 1972 [11 May 1971] 14306/71 Heading B3W [Also in Division B8] A cutter unit for use in slitting a sheet into parallel strips comprises a rotatable shaft 3, a plurality of annular cutters 6 coaxial and rotatable with the shaft and each having a flat cutting face 6a at right angles to the axis of the shaft, each annular cutter being inset in the periphery of a cutter disc 13 with the periphery of the disc and the cutter coterminous and with the cutter face 6a located in the plane of the flat face of the disc 13 and means such as sleeves 8 to locate the discs 13 in axially spaced relation. As shown, a sheet is fed by chains 1 and pushers 2 along a path P1 to a gauged slitter C1 and the resultant strips are deposited by a drop transfer device T on to a second carrier 1a 2a which feeds them along a path P2 to a second gauged slitter C2, fingers F1, F2 engaging the trailing edge of the sheet and strips respectively to increase the linear speed of the sheet and strips to the peripheral speed of the cutters 6. If parallel sections of a sheet to which lacquer has been applied are not strictly perpendicular to the leading and trailing edges of the sheet, sheet-contacting bars (F12), Fig. 11 (not shown), mounted on the fingers F1 are adjusted to make the direction of movement of the sheet through the cutting mechanism parallel to the sides of the lacquer panels. At least one role 58, Fig. 12, which may be magnetic, and a pair of pinch rolls 60, (61), Fig. 2 (not shown), tend to move the sheet against a guide cam 55, and a fence 59. Freely rotating magnetic rolls (not shown) guide the strips along path P2, a magnetic bar (62) Fig. 15 (not shown), replacing the cam 55. Auxiliary draw rolls (AR), Fig. 2, feed the slit strips to the drop transfer device T, a strip S1, Fig. 20, arriving first at position SIW with the edge 76 which will be the leading edge in its travel along path P2 resting in a slot 84 and its trailing edge 78 resting on a ledge 66 on a pivotable bar 64 and against a chamfered face 82 on a fixed bar 63 which ends in stripper fingers 79. The bars 64 are mounted on rocking spindles 74, (75), Fig. 17 (not shown), and are pivoted in turn to allow the strips to fall into the path of pushers 2a of the second conveyer by movement of a plate 85, through cranks 88-90. Cams 86 mounted on the plate 85 each cooperate with a cam follower 87 on a respective rocking spindle 74, the cam followers being progressively angularly displaced relative to the drop bars 64 to cause their operation in sequence. Each spindle is conected by linkage 71- 73 to a shaft 70 supporting pushers 67 spaced along each bar 64. The pushers are in position 67a when a strip arrives at the drop transfer device and are moved to position 67b to push the strip towards the path P2 when their associated bar 64 is rocked to drop the strip off the ledge 66.