Patent GB-407949-A (GB)
Title: Typewriting machine
IPC: B41J1/32
Filed: 1932-09-24
Abstract: 407,949. Typewriters. FISCHER, O., Kappelhof, near Friedrichshafen, Wurtemberg, and INHOFFEN, W., 24, Maassenstrasse, Berlin, both in Germany. Sept. 24, 1932, No. 33185/33. Divided on 26601/32 under which a Specification was laid open to inspection under Sect. 91 of the Acts, Oct. 10, 1932. [Class 100 (iv).] Relay type-wheel actions ; case-shiftmechanism ; shiftkey actions.-A swinging type-cylinder is rotated for type-selection by means of an electromagnetically operated gear-sector or the like, and is differentially arrested by means of keystops and a co-operating stop-arm connected to the gear-sector, the gear-sector being of larger radius than the co-operating pinion on the type-cylinder, and the stops being arranged arcuately betwe en the axes of the type-cylinder and stop-arm. The arrangement permits of the use of a short, light stop-arm, and simplifies the connections between the stops and keys. Electromagnetic means, described below, may be provided for swinging and returning the type-cylinder. Shiftmechanism described below, for the type-cylinder is operated for tworow shift by means of shift-keys, and is operated electromagnetically for single-row shift by means of alternate typing-keys. In the machine shown in Figs. 1 and 2, a type-cylinder 1, having six circumferential rows of types, is mounted on a square shaft 2 splined in a drum 10 which is revoluble in a drum 12 having sidearms 13, 14 mounted on trunnions 15, 16. The type-cylinder is rotated in opposite directions by means of electromagnets 27, 28 having rotary armatures 140, 141 carried by a square shaft 30 which is provided with a sector 36 gearing with a pinion 11 on the drum 10. A stop-arm 37 on the shaft co-operates with bell-crank stops 38 operated by the keylevers 110, rebound of the stop-arm being prevented by means of spring-urged dogs 39, 40 mounted thereon. The dogs may be replaced by stop-arms which co-operate with toothed sectors on the armatures 140, 141 and are operated by the electromagnets 27, 28. The bell-cranks 38 engage levers 125 abutting on rods 124 which rest on rocking plates 123 co-operating with dogs 121 on levers 115 operated by the key-levers, the arrangement preventing the parts from binding. The dogs are so arranged that each plate 123 is operated by either of a pair of key-levers. The typecylinder is returned to normal angular position by means of pivoted arms 48 which are connected by a spring 46, and co-operate with a roller 49 on the shaft 30. The type-cylinder is arrested in normal angular position by co-operation of a cross-arm 54 on the shaft 30 with a pair of rocking arms 56 connected by bell-cranks 61 and links 66 to arms 67 on separate universal bails 68 arranged over the right-hand and lefthand sets of plates 123. The arms 67 are arranged to close contacts 132 in circuit with the electromagnets 27, 28. The type-cylinder is swung for impression by means of the rotary armature 25 of an electromagnet 26, which is in shunt with the electromagnets 27, 28. The shaft 22 of the armature 25 is connected to the arm 14 by a link 20, preferably consisting of a coiled spring. Swinging of the type-cylinder is normally prevented by means of a sleeve 31 mounted on the shaft 30 and having a groove 32 co-operating with a roller 33 on an arm 34 on the drum 12. The sleeve is normally locked by means of a part 29 which is connected by a link 45 to dogs 43, 44 mounted on the stop-arm 37 and arranged to engage the bell-cranks 38. The pawl releases the sleeve, to permit swinging of the type-cylinder, shortly before the rotary movement is completed. Instead of the sleeve and pawl, the electromagnet 26 may be provided with a switch which is operated, for instance by the dogs 43, 44, slightly before rotary movement of the typecylinder is completed. The type-cylinder is returned, after impression, by means of a spring, or the rotary armature 71 of an electromagnet 70, the armature-shaft being connected by a link 74 to the arm 13. The type-cylinder is shifted axially by means of a lever 82 carrying a universally mounted rod 78 which is provided with a ball engaging a cup at the bottom of the shaft 2. The lever 82 is connected by slotted links 88 to levers 87 carrying shift-keys u<1>, u<2> for raising the type-cylinder to bring the third and fifth rows of types respectively into position. Each lever 87 is connected to a stop-device consisting of a toggle 89, 90 connected to a spring 92. One of each pair of the key-levers 110 is arranged to shift automatically the typecylinder to bring the second or, in conjunction with the shift-keys u<1>, u<2>, the fourth or sixth row of types into position, the most frequently used types being in the first, third, and fifth rows. The lever 82 is provided with arms 93 supporting rollers 94 which co-operate with a cam 95, Fig. 10, secured to the rotary armature 96 of an electromagnet 76. Alternate dogs 121 co-operate with universal plates 133 to close the circuit of the electromagnet 76. The armature 96 co-operates with a reboundpreventing latch 100 controlled by the electromagnet 76. To afford time for shift, the armature 96 may be arranged to close the circuit of the electromagnet 26, or the electromagnet may be provided with an energizing-coil. When one of the key-levers 110 is depressed, the electromagnet 27 or 28 turns the typecylinder to the right or left and, on release of the latch 29, the electromagnet 27 swings the type-cylinder for impression. One of each pair of key-levers causes the electromagnet 76 to shift the type-cylinder from row to row, and the shift-keys u<1>, u<2> are employed for two-row shift. Adjustable bails 134, connected to the armature 25, release the operative dog 121 and thereby break the contacts independently of return of the key-lever and the associated members. The bails or dogs may be so arranged that the dogs employed when typing commas &c. are released at an earlier period than those employed in typing characters of large surface. The bails 68 may each be replaced by a pair of superposed bails which co-operate with the dogs 121 and are each provided with a finger for closing two contacts. The lower bail closes the circuits of the electromagnets 26, 27 28, and the upper bail closes the circuits of the electromagnets 27, 28, 76, the electromagnet 76 being arranged to close the circuit of the electromagnet 26.