Patent GB-545196-A (GB)
Title: Improvements in or relating to cinematograph target apparatus
IPC: F41J9/14
Filed: 1940-11-12
Abstract: 545,196. Kinematograph targets. SOMERS, A. E. Nov. 12, 1940, No. 16393. [Class 20 (i)] A control device for a kinematograph target is operated through an electrical circuit energized by impact of the bullet to cause stoppage of the projector either at once or after a predetermined interval of time to set in motion time controlled mechanism through gearing to cause movement of the multiply target screen, to bring the bullet holes therein out of coincidence and to cause resumption of movement of projectors after a predetermined time interval. The target casing 16, Fig. 1, encloses a three-ply screen, two of the plies being continuous and passing around winding drums 3, 9 and over guide pulleys 4, 6, 7, while the third ply 10 passes from a pulley 11 to a ratchet controlled hand-operated drum 14. The continuous ply may be moved in opposite directions alternately by detaching the driving pin 33 from one drum to the other as required, the drums being driven from the motor 15. The multiply target screen passes across an opening 2 in the casing which can be illuminated interiorly by lamps, and vibration contacts in a casing 17 are actuated by impact of a bullet on the casing to stop the projector, light the lamps, and bring the control mechanism into operation so that for a time interval the picture is stationary and the bullet hole therein is visible, and then the target screen is moved to obliterate the perforation and the projector is restarted. A solenoid 18, Fig. 8, in circuit with the vibration contacts is the primary controller of the sequence of operations. The control shaft 46 is driven from the projector or through a synchronous motor. The core 20 of the solenoid has pin and slot connections with levers 22, 65 mounted on a sleeve on a shaft 64, catch levers 23 and 71 and clutch levers 63 being also attached to this sleeve. The clutch levers actuate a clutch member 57, which is normally disengaged, to cause a pulley 54 driven from the projector or from a synchronous motor to drive a sleeve 47 on the control shaft 46 through worm gearing 61, 62. On this sleeve is mounted a pin disc 41 and on the shaft is pinned a cam 42, and relative rotative adjustment between the shaft and the sleeve is made possible by means of a spring 52 and discs 50, 51, which can be pinned together in adjusted position so that the sleeve and shaft rotate together. The cam is adapted to control the movements of spring mounted switch arms 58, 36 through a lever 25 all pivoted on separate sleeves on a shaft 26, a catch arm 35 being on the same sleeve as the arm 36 so that this switch arm can be maintained in contact position with a fixed switch 29, 30 by a catch 37, until released by a pin 40 on the control pin disc 42. Another pm on this disc also disengages the catch 71 of the clutch catch lever 70 and allows the clutch 57 to be disengaged by springs 66, at the same time braking the control gear rotation by a brake 86. The sequence of operations is as follows: the shot is fired and the bullet perforates the target screen and hits the casing causing a trembler switch to be operated which closes the circuit of the solenoid 18. Movement of the armature of the solenoid actuates the clutch 57 to set in rotation the control mechanism and also releases the catch 23 of the cam follower lever 25, which moves by spring action against the surface of the cam 42. Simultaneously after a predetermined interval according to the setting of the cam and the pin disc a notch 43 on the cam allows the lever to move anti-clockwise under spring action which throws over the switch arm 36 to the fixed contacts 29, 30, which causes the lamps 77 to light and through a solenoid or mechanical means (not shown) disengages the projector drive, so that the picture remains stationary. The switch arm 36 is retained in engaged position by a spring catch 37. After another predetermined interval a large projection on the cam presses the lever 25 to the left, engaging the switch arm 58 with fixed contacts 29, 31 to start the motor 15 which moves the screen to obliterate the perforation. This movement terminates as soon as a notch 44 on the cam allows the lever 25 to move anti-clockwise again under spring action disengaging the switch arm 58 while at the same time a pin on the pin disc releases the catch 37 of the other switch arm so that the switch arms come into neutral position again. At the same time the catch 71 and lever 70 are actuated by another pin to release the control actuation clutch 57, the projection motor is re-started and the armature 20 of the control solenoid 18 moves outwardly under spring pressure so that the clutch 23 engages the lever 25 and the clutch 57 is disengaged. Over-running of the shaft 60 is prevented by friction means 86. A press button switch 81 is provided to cause independent movement of the target screen to obliterate previously formed holes when required and a tumbler switch 82 is also provided to render the projector drive ineffective for longer periods than that provided by the control mechanism.