US 4,371,275 AGranted

Selector system for a single type carrier in typewriters and similar printing machines

AssigneeIng. C. Olivetti & C., S.p.A.

InventorWalter Albrile

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Abstract

A selector system for a typewriter of the single type carrier kind, in which a series of stop members are selectively positionable in order to cooperate with two selector levers in such a manner as to effect the variable displacement of the type carrier for the selection of the character which is to be printed. A control member releases the selector levers for their operation by driving forces and comprises a cyclic resetting member which returns the selector levers to their position of rest against the action of the driving forces on completion of the typing of the character selected. A shift device for the type carrier comprises a cyclically operating drive mechanism adapted to operate a member kinematically connected to the type carrier for the selection of one of the two zones in which the characters are distributed.

Claims14

Dependent claims

In a selector system for a type carrier of a typewriter comprising a support, an intermediate lever pivoted on the support and operatively connected with the type carrier for the selection of a character of the type carrier and two groups of stop members selectively settable in dependence on the character to be selected, the combination comprising:

a substantially rectilinear selector lever having a longitudinal axis and including a central zone and two stop and fulcrum shoulders lying on opposite zones of said longitudinal axis with respect to said central zone, wherein each of said two shoulders is cooperative with an associated group of said two groups of settable stop members and wherein a set stop member of said group lies at a different distance from the associated shoulder;
means pivoting the central zone of said selector lever on said intermediate lever for causing the typing member to select a different character in response to a variable displacement of said central zone;
driving spring means for rotating said selector lever with respect to said intermediate lever according to a predetermined sense of rotation;
a forked member having two arms substantially symmetrical with respect to the central zone of the selector lever and operable to hold the selector lever in a rest position against the action of said driving spring means;
means for releasing said forked member for causing the selector lever to be operated by said driving spring means up to the arrest of one of said stop and fulcrum shoulders against a set stop member, with following displacement of said central zone and selection of the desired character, wherein a set stop member of one group of stop members causes a rotation of the intermediate lever along one sense of rotation and the set stop member of the other group of stop members causes a rotation of the intermediate lever along another sense of rotation opposed to said one sense of rotation;
and
means restoring the forked member for causing the selector lever and the intermediate lever to return to said rest position on completion of the typing of the selected character.

4 more elements

A typewriter having a type carrier head whose characters are distributed in two different areas, a selector with an output member movable for the selection of the character to be typed, in one of the two areas, and an intermediate member which permits two different arrangements of the head in relation to the said output member for the purpose of preparing one of the two areas for typing, comprising a first member kinematically connected to the head, a cyclically operated driven mechanism, and a second member which is moved by the said mechanism between one of two zones outside the trajectory of the said first member and a zone in which it engages the said first member and in which the second member, in its movement from one of the two zones to the other, displaces the intermediate member in relation to the output member of the selector and prepares for typing the other of the two areas of characters on the head, where the first member comprises a rocking lever provided with at least two shoulders, and wherein the second member engages these shoulders for the rotation of the rocking lever and the selection of the other area when this second member moves in the zone of engagement with the first member.

Dependencies are inferred from the claim text.