Patent GB-191020526-A (GB)
Title: An Electrically Actuated Typewriter with Type-wheel and Keys.
Inventor: FISCHER OSKAR
IPC: B41J3/44
Filed: 1910-09-02
Granted: 1911-02-16
Abstract: 20,526. Fischer, O. Sept. 2. Electric type-wheel actions; case-shift mechanism.-In machines in which the keys close electric circuits for rotating and swinging a type-wheel, and the circuits are broken independently of the keys, the breaking action is initiated before, and completed independently of, the completion of the printing movement of .the type-wheel; rotation is completed just before impression. For this purpose, the keys set contact-retaining slides, levers, or the like, which are independently actuated for breaking the circuits, and may serve also as the stops for limiting the rotation of the type-wheel. In the machine shown in Figs. 1 and 2, the type-wheel 12 is carried by a spindle 13 adjustable by shiftkeys 155, 155<1> in a sleeve 70 mounted at the top end by a ball bearing in a plate 54 carried by pillars on a plate 14. The lower end of the spindle 13 is mounted on a pin actuated by the shift-keys, in a sleeve 56 on the plate 14. The plate 14 forms the armature of an electromagnet 19 for effecting the swinging movement of the type-wheel, and is mounted on pillars 50 and returned by a spring 52. The downward movement of the armature 14 is limited by cushions 162<1>, preferably adjustable on pillars 162, and the upward movement by a cushion ring 120 adjustable on a rod 118, which is reciprocated by the armature 14, the ring 120, and a second ring 121. For rotating the typewheel, a pinion 77 on the sleeve 70 meshes with a toothed sector 78 rotated in opposite directions by electro-magnets 17, 18 through spring- returned armatures 83, 84 connected by rods 81, 82 to a pin on the sector. A central returning-spring 97 carries a roller engaging in an enlargement on the sector. A dead-beat action is obtained by means of a projection on the sleeve 70 and co-operating spring pawls on the armatures 83, 84. The contact-retaining devices, serving also as stops for the type-wheel, are shown as spring-returned levers 35 mounted on a semicircular spindle 46, and arranged so that alternate levers control a corresponding electro-magnet 17, 18, to determine the direction of rotation of the type-wheel, either by means of alternate long and short contact springs 40, 41 and contacts 42, 43, or by means of two pivoted contact bows. Two stop-arms 100, 101 are provided on the sleeve 70 and co-operate with the alternate levers 35, as determined by the direction of rotation. The circuits of the electromagnets 17, 18 include auxiliary electro-magnets 171, 172, the armatures of which carry contact springs 173, 174 for the circuit of the electromagnet 19; the armatures and contacts are adjustable so that the time of impression can be regulated; alternatively, the electro-magnet 19 may be controlled by hinged or resilient trailing members on the armatures of the electro-magnets 17, 18. The levers 35 are depressed by arms 31 on spring-retained pawls 32 on spring - returned levers 26, which are depressed by the key-levers 15 through vertical rods 27. The pawls 32 are tripped, to initiate the breaking action, by means of other arms 33, which are engaged by a yoke 116 actuated from the armature 14 by means of rings 122, 123 on the rod 118. The resilience of the contact springs of the levers 35 retards the breaking for a short time, for the completion of the swinging movement. Electric letter-spacing mechanism. - The rod 118, Fig. 1, reciprocated by the armature 14, is connected at its upper end to an escapementdog rocker 116<1>, and at its lower end to a lever 130 loosely connected to the space-key lever 132. Ink-ribbon mechanism.-A pawl 153, Fig. 1, pivoted on the swinging type-wheel support, actuates a ratchet-wheel 149 on a worm-shaft 148, which gears with wheels 147 clutched to the spool spindles 145 by screw-studs e for reversal.