Patent GB-1002034-A (GB)
Title: Index character setting device and apparatus, particularly photographic apparatus, comprising the same
IPC: G03B17/24
Filed: 1961-07-21
Abstract: 1,002,034. Recording apparatus. AGFA A.G. July 21,1961 [July 23, 1960; July 26,1960], No. 26602/61. Heading G1J. [Also in Divisions B6 and F2] Type-wheel machines; type-wheel actions; single and multiple-surface type selection: Key boards. A printing device 16 Fig. 1, in a photographic camera or photographic colour printing machine (in G2-G3) is provided with a plurality of type carriers 34, Fig. 4, each provided with a plurality of characters 42 and each carrier being power operable by a shaft 28 and friction clutch assembly 32, 33 so that particular characters thereon may be displaced into a printing position singly or collectively. The carriers are arrestable in said position by a pawl 45 engaging a ratchet wheel 35 fast with the carrier on de-energization of an electromagnet 37 the arrestment being responsive to the actuation of a setting means for the particular characters. The setting means comprises rows of keys 12, 13, and 15 mounted on a keyboard 11, each row of keys representing colour and density correction values in terms of numerical characters on the type carriers and each carrier is associated with one row of keys. In the preferred embodiment in Fig. 4 a printing unit 19 Fig. 2 comprises a plate 31 of insulating material provided with commutator segments 62 and a slip ring 61 for selective operation of the electromagnet 37 which on depression of one of the keys 12 arrests with its associated pawl 45 the ratchet wheel 35 fast with the type carrier 34 mounted freely rotatable on a common driving shaft 28 to which it is coupled by a friction coupling comprising a friction wheel 32 and a cork ring 31. When a particular key 12 is depressed a change-over switch 73<SP>1</SP>, Fig. 7, is changed over whereby connection is established between leads 68, 69 through the magnet 37 and a relay 81 (not shown) so that a motor 20 driving the shaft 28 is started and the carrier 34 is displaced until a contact 58 reaches the segment 62<SP>1</SP> corresponding to the switch 73, whereby the motor is stopped and the magnet de-energized to arrest the type carrier which is now in the printing position. Platen impression arrangements; alignment for impression. Impression is effected by upward displacement of a support plate 84, Fig. 2, by a magnet (not shown). When more than one key is depressed the corresponding type carriers are individually arrested and aligned for impression and the last type carrier via the appropriate commutator segment interrupts the supply and the type impression follows as above. Key interlocks. The keys in each row 12... 15 are interlocked so that all the keys of a row upon depression of a key are locked in the depressed position and the previously actuated key is unlocked so that it may return to its original position under the influence of a spring (not shown). Resetting of the last actuated key, without moving of another key into its operative position may be achieved by only a partial of another key in the row, whereby the carrier returns to its original position. The different rows of keys are independent of one another. Index setting arrangements. The rows of keys 12... 15, may be replaced by equivalent rotary knobs 86... 89 (Fig. 8, not shown) which are arranged in juxaposition on the board 11. The knobs are provided with pointers 86<SP>1</SP>... 89<SP>1</SP> which co-operate with scales 94... 97, respectively. Type-wheels. The type carriers 34, Fig. 4, are provided with contact members 57, 58 arranged in an eccentric annular groove 52 and spring urged against the plate 31 with springs 53, 54 which also press against the friction wheel 32 to complete coupling assembly 32, 33. Recording measurements. The printing device may also be used with devices set automatically according to varying values by means of an electric measuring instrument. The numerals on the type carrier may also be replaced by marks or lines of increasing or decreasing width or number. Specification 1,002,035 is referred to.