Electrically operated typewriter

Claim 1

An electrically operated typewriter comprising, in combination: a. a rotatably mounted type carrier disc having an axis and a plurality of circumferentially distributed resilient tongue portions; b. a type on each tongue portion; c. an electric motor; d. connecting means for drivingly connecting said electric motor to said disc and for rotating the disc about said axis when said motor is energized; e. sheet carrier means for carrying a sheet of writing material; f. a movably mounted hammer member; g. electromagnetic hammer operating means for driving said hammer member into abutting engagement with one of said tongues and for thereby impressing the type of said tongue on a sheet carried by said sheet carrier means and for withdrawing said hammer member; h. arresting means for arresting rotation of said disc, said arresting means including 1. two locking members, one of said locking members being connected to said type carrier disc for rotation therewith, 2. limiting means limiting rotation of the other locking member about said axis, 3. electromagnetic engaging means for engaging and disengaging said locking members, said electromagnetic operating means and said electromagnetic engaging means each including i. a winding for generating a magnetic field when said winding is energized, ii. a return spring, iii. an armature connected to said return spring and mounted in said field for movement in one direction against the restraint of said spring when said winding is energized, and for movement in a second direction by the force of said spring when said winding is deenergized, 4. said hammer member being connected to the armature of said hammer operating means and driven against said tongue by the return spring of said operating means, 5. one of said locking members being connected to the armature of said engaging means and engaged with the other locking member by the force of the return spring of said engaging means, 6. the armature of said engaging means being moved in the direction of said axis by the associated return spring and the associated magnetic field, 7. said locking members including respective rows of teeth annular about said axis, said teeth being secured to saiD disc and to the armature of said engaging means respectively, 8. said limiting means including a normally stationary frame and yieldably resilient means secured to said frame and to said armature of the engaging means for resisting rotation of said armature of the engaging means about said axis, while permitting axial movement of said armature; i. deactivating means for deactivating said connecting means; and j. control means for operating said hammer operating means and said deactivating means simultaneously with the arresting of said disc.