Patent GB-1419883-A (GB)
Title: Measuring apparatus
IPC: G01B7/04
Filed: 1973-05-17
Abstract: 1419883 Measuring continuous lengths FRED CAM (ENG) LTD 15 Aug 1974 [17 May 1973] 18513/73 Heading G1M Material to be measured is moved by a roll (not shown) connected to a coupling 4, Figs. 2, 3 driving a measuring apparatus housed in a casing 23. The coupling 4 drives a shaft 1 through an electrically operated clutch 5 when measuring off a length of material, but an electric motor 6 is arranged to return drive the shaft 1 through a second clutch 7 and belt 8 in a direction opposite to that given by the drive roll. When the shaft 1 is rotated clockwise by the motor 6, Fig. 1 to begin another measurement, a pivoted finger 10 eventually serves as a stop to a shaft projection 9 and actuates a fixed setting switch 12 to stop the motor 6, energize the main clutch 5 and disengage the motor clutch 7 so that the shaft 1 may be driven by the driving roll and the moving material in a measuring cycle. The projection 9 now rotated by the driving roll instead of the motor 6 then rotates anti-clockwise and trips the finger 10 at each revolution. A measurement setting disc 13 on the shaft 1 is rotatably adjusted on the shaft by means of a knob 14 to set off the odd fractional part of the length to be measured equal to a part of a revolution of measurement of the driving roll, the remainder of the length being later checked off by complete revs of the roll counted by a counter. A proximity switch 15 and trigger switch 18, Fig. 2, on base 16 are operated by actuators 17, 19 on the disc, the switch 18 being actuated every complete revolution of the disc to feed a pulse to the counter 20 pre-set by dials 21, 22, whilst the switch 15 is actuated by 17 and a counter switch 32 only once after the pre-set number of revolutions have been made. Fine increments within the marking on the disc can be pre-set by operating a screw 29 and knob 30 to move the arm 28 carrying the switches 15, 18. In operation the motor 6 is started to bring the projection 9 by clockwise rotation into engagement with the finger 10 to make the switch 12, de-energize the clutch 7 and allow the driving roll to move the material. The main clutch 5 is then energized and the drive transmitted from the drive roll to the shaft 1. At each rev of the shaft 1 and the disc 13 the projection 9 now rotating anti-clockwise flips the part 33 of the finger 10 and the actuator 19 operates trigger switch 18 to transmit a pulse into counter 20. When a pre-set number of pulses i.e. revs related to distance required has been received by 20 the counter switch 32 is actuated and the drive roll is slowed and brought to a stop by the proximity switch 15 which is actuated by the next pass of 17. A switch not shown then operates a guillotine on the continuously fed material. A secondary clutch is now energized to actuate a lock switch and a delay timer to ensure that the clutch 5 is deenergized and the drive roll is at rest before motor 6 is re-started. In Figs. 5 and 6 (not shown) the material (39) drives the roll (36) through the coupling 4 which connects directly to the roll (36) and an air motor (37) replacing motor 6. A pressure roller (38) operated by a double acting ram (40) pushes the material against the roll and the pressure roll is withdrawn when switch 15 is actuated and advanced when switch 12 is operated.