Patent GB-965558-A (GB)
Title: Magazine-type transparency slide projector
IPC: G03B23/04
Filed: 1960-12-14
Abstract: 965, 558. Projectors with two magazines for different slide sizes. FRANKE & HEIDECKE G.m.b.H., [trading as ROLLEI-WERKE FRANKE & HEIDECKE]. Dec. 14, 1960 [June 1, 1960], No. 43024/60. Heading G2J. A slide projector includes magazines on either side constructed to house respectively, slides of two different sizes, and means for feeding a slide and returning it to its appropriate.magazine by movement transverse to the optical axis. As shown in Figs. 1 and 6, claws 17 and 18 are adapted to transversely feed and return a slide in the appropriate magazine through correspondingly dimensioned apertures in the slides of the projector relatively displaced along the optical axis of lens 5 to avoid the possibility of jamming. Claws 17 and 18 are moved along rods 19 and 20 respectively in opposite directions by means of a double-armed lever 27 rotated via a pinion 26 and a rack 25 formed in a carriage reciprocable along guide rods by a cam 22 driven by shaft 21 which is couplable to a continuously running motor by a magnetic clutch 35 (Fig. 8) controlled by a manually operated switch. Manual control of slide change is possible by means of knob 23. The shaft 21 is fast with a cam 24 driving a member 53 in reciprocating motion whereby one of the pawls 64, 66, only one of which at a time can engage rack 52 of magazine 51 (in a manner described in more detail in Abridgment 965, 557) for movement of the latter in either direction, moves the magazine step by step. After each step the circuit of the magnetic clutch is broken by a switching cam 30 carried by shaft 21 (and not shown in Fig. 6). This cam, of course, stops in the "off" position, and to re-energize the clutch for a further slide-change, a switch 40 is manually operated which by-passes the cam-controlled switch 41 and may be released when the cam has rotated by a small amount away from its "off" position and the associated switch is conducting. To allow free withdrawal of the magazines without the slides fouling the claws, the latter may be brought into the position indicated in Fig. 1 by operating a further manual switch 43 that provides a current path to the magnetic clutch via a contact 44 that is opened by the switching-cam when this has rotated 180 degrees away from its normal "off" position. A manually-operated switch 45 also controls the energization of magnet 36 to move member 59 into the position shown thereby disengaging pawl 66 from, and engaging pawl 64 with the rack 52. Simultaneously, the magnet 36 closes a circuit via switch 46 energizing the driving motor of shaft 21. The main driving motor is indicated by its windings 31 and field magnet 32. An auxiliary winding 33 provides a low rectified voltage for the magnetic elements via the rectifier network 34, and a low alternating voltage for motor 37 which is operable by an external switch to provide power for focusing movement of the projection lens. All the manually-operated switches referred to are mounted as a bank 75 (Fig. 5) on the projector housing, and leads 47 are provided for an optional remotely situated switching-bank. The switches 75 are illuminated by diffuse light from the projection lamp via ventilating louvres 79. Flaps 9, 10 give access to a cooling fan and the rest of the mechanism. Specification 965, 559 also referred to.