Patent GB-863518-A (GB)
Title: Apparatus for slitting rolls of sheet material such as rolled webs of fabric or cloth
IPC: B24B3/46
Filed: 1959-02-03
Abstract: 863,518. Slitting fabric &c. rolls. LEVER BIAS MACHINE CORPORATION. Feb. 3, 1959 [Feb. 25, 1958], No. 3752/59. Class 31 (1). [Also in Groups XXII and XXIII] A machine for slitting a fabric &c. roll 52 into narrow rolls comprises a rotary circular knife 33 mounted on a portion 32 of a compound carriage 30, the portion 32 being pivotally mounted on another carriage portion 31 which is traversable along rails 22. The carriage is traversed by means of a reversible electric motor 74, Fig. 12, which drives a shaft 41 through a clutch 75, an electrical brake 79 and gearing including a gear 47. The knife and carriage portion 32 are advanced towards and retracted from the roll 52 by means of a pneumatic motor 84, Fig. 8, having a plunger 83 movable under the control of an electrically operated valve 90, the speed of cutting being controlled by means of an hydraulic motor 87, coupled to the motor 84, having a plunger 86 controlled by a valve 91. The knife is driven by an electric motor 72, Fig. 14, mounted on the carriage. The roll 52 is secured to a faceplate 26, Fig. 3, by means of pins 26a and spikes 56, and is driven by an electric motor 96, Fig. 14. Means are provided for readily releasing the left-hand end of the spindle 25 carrying the roll 52. The knife and carriage portion 32 may be manually advanced towards and retracted from the roll 52 by means of a handle 36, to which is operatively connected a graduated scale 38 for determining the spacing of the cuts. The carriage may be traversed manually by means of a hand wheel 40. The automatic and semi-automatic pivotal and axial movements of the knife are correlated by means of the circuit shown in Fig. 14. At the ends of the forward and reverse automatic movements of the knife, limit switches 108, 109 respectively are actuated, the switch 108 being in circuit with a time-delay relay 112 connected to the valve 90 whereby the knife is made to dwell at the forward end of its stroke so as to cut through the core supporting the fabric roll. Mounted on the shaft 115, Fig. 12, of the gear 47 is a cam wheel 116, Fig. 14, driven by the motor 74 and co-operable with an arm 117 arranged to actuate a microswitch 118. The carriage portion 31 carries limit switches 103, 104, Fig. 3, engageable with adjustable abutments 105, 106 carried by the machine frame. By arranging for the valve 90 to assume a neutral position and for the motor 74 to be disengaged, the machine may be entirely manually operated. The knife is automatically sharpened in its retracted position by means of a grinding wheel 121 driven by an electric motor 120 mounted, together with an emery element 124, on a bracket 123, the motor 120, wheel 121 and element 124 being shiftable towards the axis of the knife to accommodate wear of the knife. The knife is automatically lubricated as it advances from its retracted position, by means of wax sticks carried by holders 132, 135, Fig. 3, the holder 132 being actuated by a solenoid 131 connected to a switch 130. The holders and solenoid are mounted on a pivotally mounted head piece and guard 138 which is angularly adjustable to enable the wax sticks to be adjusted towards the knife axis to compensate for wear of the knife. The holders are normally in raised positions, out of engagement with the knife, and when the solenoid is energized, they are brought down momentarily, during the initial forward movement of the knife, to effect the waxing.