Patent GB-672428-A (GB)
Title: Machine for making box blanks
IPC: B31B50/16
Filed: 1950-04-24
Abstract: 672,428. Cutting-machines. JACOB INDUSTRIES, Inc., W. P. April 24, 1950 [April 27, 1949], No. 10021/50. Class 31 (i). A machine for cutting a box blank B, Fig. 22, from a strip of paper board supported on a work-table 10 comprises a pair of feed rollers 14, 16, Fig. 7, combined slotting and scoring means 18, 20 movable vertically towards and away from the work-table for forming transverse slots N and transverse score lines E3, two pairs of scoring rollers 22, 24 for forming longitudinal score lines E4, a transverse cut-off knife 320, Fig. 9, and a motor-driven belt 608, Fig. 10, for moving the completed:blank across a delivery apron 548, the feed rollers, slotting and scoring means, scoring rollers, and cut-off knife being operated by hydraulic and electrical means controlled by. means of eight electric switches having feeler fingers F<SP>3</SP> to F<SP>6</SP> and F<SP>9</SP> to F<SP>12</SP>, Fig. 10, adapted to be engaged successively by the leading edge of the strip and disposed in spaced relationship corresponding to the length and width of the box to be formed. The feeler fingers and switches are mounted on slidable gauge assemblies 550, 552, 554, 556, Fig. 10, co-operating with index marks and are arranged in pairs, actuation of the first switch of each pair causing the rotational speed of the feed rollers 6 to be reduced and actuation of the second switch of each of the first three pairs causing successively the stopping of the feed rollers,. the operation of the slotting and scoring means, and the re-starting of the feed rollers. Actuation of the second switch of the last pair causes, the stopping of the feed rollers and operation of the cut-off knife. A motor-driven saw 104, Fig. 7, is provided in front of the feed rollers for trimming one edge of the strip or dividing it longitudinally. Edge guides 350, 352, Fig. 9, are provided for determining the overall width of the blank to be cut. The slotting cutters 18 are carried by a transverse scoring-bar 150, Fig. 3, and are moved vertically by cam means. The feed rollers and scoring rollers, slotting and scoring means, and cut-off knife are driven or operated by hydraulic motors 80, 158, and 342 respectively, the motors and their control switches being arranged in a circuit, Fig. 23, including a motor pump unit 100, interlocks, and solenoid-operated valves. The feed rollers are started when the leading edge of the strip strikes a switch S<SP>1</SP>, Fig. 23. The scoring rollers, slotting and scoring means, and edge guides are movable transversely of the strip, to vary the width and depth of the box to be formed, by means of carriages 164, 165, 186, 187, and 564, Fig. 24, which are actuated by lead screws driven by means of electric motors 258, 260. The relative positions of the scoring rollers and slotting and scoring means are indicated by means of graduated scales co-operating with index marks. The cut-off knife is pivotally mounted at 322, Fig. 1, and operated from the motor 342 through the intermediary of a toggle device. Means are provided for adjusting the vertical spacing of the feed rollers and scoring rollers to accommodate strips of different thickness. The trimming saw may be replaced by co-operating upper and lower shearing disc cutters, Figs. 18 and 19 (not shown).