GB1204113A - Improvements in and relating to foam cutting apparatus - Google Patents

Abstract

1,204,113. Cutting apparatus. NON-SAG SEATING CO. Ltd. 11 Sept., 1967 [16 June, 1966; 7 Aug., 1967], Nos. 27009/66 and 36234/67. Heading B4B. Apparatus for making a planar cut in a block of foam material comprises planar cutting means, means for moving the cutting means in a plane about an axis relative to the material, and transport means for effecting translational movement of the cutting means in a said plane, the arrangement being such that the angle of cut with respect to said block can be altered without altering the length of said cutting means capable of being presented to said material to effect a cut therein. In one form, a carriage 12 movable vertically with respect to a column 11 mounted on a plinth 10 has journalled with respect thereto a rotatable axle 20 to which is pivoted a support arm 14 provided with wheels 21 about which is passed a band knife 15 for cutting a block of material carried by a work-table 16. The lower wheel 21 is driven by a motor 22. The axle 23 of the upper wheel 21 is carried by a spring- loaded slide 24. The arm 14 is pivotable about the axle 20 by means of a rotatable worm 27 Fig. 2, engaging a pinion 70 or quadrant. The carriage 12 is movable vertically by means of a rotatable screw-thread rod 17 engaging a threaded portion 18 on the carriage . The arm 14 is counterbalanced by dashpot means 45 carried by a chain 41 and comprising a cylinder 46 in which is movable a plunger, the upper portion of the cylinder being linked to an air line 48 incorporating a pressure valve 49 the plunger of which is controlled by a cam-plate 50 carried by the arms 14. In another form, a cutting head 72 is carried by a support arm 74 pivotable about a pivot 71 disposed at the rear end of a carriage 70 which is movable horizontally in a slideway 65 having a base 66 mounted on sliding portions 63 movable vertically in cylinders 62, 62<SP>1</SP> by means of a screw-jack or an hydraulic ram under the control of means 64. The arm 74 has at the ends thereof forwardly projecting portions 77, 77<SP>1</SP> carrying wheels about which a band knife is passed. The lower wheel is driven by a motor 84. The work table 61 comprises a fixed portion 100, Fig. 5, and a portion 93 which is movable in tracks P2, P2<SP>1</SP>. The portion 100 has a slot 103 to allow passage for the band knife. The worktable is provided with guide-rails 100 which carry support means 106 for a fence (107), Fig. 4 (not shown), to engage the block of material to be cut. The movable portion 93 may carry a rotatable turntable (110), Fig. 7 (not shown), so that a circular cut may be made in a workpiece.