US 4,686,870 AGranted

Position incrementer

OwnerJames F. Mackinventor

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Abstract

Apparatus utilized in combination with a carriage reciprocating between a primary base position and a second position spaced away from the primary base position. The apparatus varies the distance of the second position of the carriage from the primary base portion of the carriage and includes a stop surface on the carriage and a plurality of secondary stop surfaces operatively associated with the carriage stop surface. The secondary stop surfaces are each movable between at least two operative positions, a first operative position in which one of the secondary stop surfaces contacts the carriage stop surface when the carriage is moving away from its primary base position, and, a second operative position in which another of the secondary stop surfaces contacts the carriage stop surface when the carriage is moving from its primary base position. When a secondary stop surface contacts the carriage stop surface, the carriage is halted in its second position. Movement of the secondary stop surface between their first and second operative positions is activated by a control mechanism carried on the reciprocating carriage.

In combination with reciprocating carriage apparatus, said apparatus including

a housing,
an elongate rod mounted in said housing and having a longitudinal axis, and
a carriage mounted on said rod to slidably linearly reciprocate therealong between a plurality of operative positions, including
a primary base position,
a secondary position spaced a first distance away from said primary base position, and
a tertiary position spaced a second distance away from said primary base position, said second distance differing from said first distance,
said carriage generally moving
in a first direction of travel when moving from said primary base position to one of said secondary and tertiary positions, and
in a second direction of travel when moving from one of said secondary and tertiary positions to said primary base position,
means for varying the distance said carriage linearly travels in said first direction of travel away from said primary base position, said means including
(a) a support member rotatably mounted on said housing and spaced away from said elongate rod;
(b) a stop surface on said carriage spaced away from said elongate rod in a direction generally toward said support member;
(c) at least a pair of secondary stop surfaces mounted on said support member for rotation therewith and operatively associated with said carriage stop surface, each of said secondary stop surfaces movable between at least two operative index positions,
(i) a first operative position in which said secondary stop surface is positioned to contact said carriage stop surface when said carriage is moving in said first direction of travel and to stop said carriage in one of said secondary and tertiary positions, and
(ii) a second operative position in which said secondary stop surface will not contact said carriage stop surface when said carriage is moving in said first direction of travel;
(d) a control member carried on said support member for rotating said member when said carriage is moving to said base position from one of said secondary and tertiary operative positions in said second direction of travel, said control member having a first contact surface generally at an angle with respect to said longitudinal axis of said elongate rod;
and,
(e) a second contact surface on said carriage
(i) spaced away from said elongate rod in a direction generally toward said support member,
(ii) linearly reciprocating with said carriage, and
(iii) shaped and dimensioned to
engage and slidably move over said first contact surface when said carriage and second contact surface are moving in said second direction of travel toward said primary base position, and
rotate said control member and support member and simultaneously rotate each of
said secondary stop surfaces between said first and second operative positions,
said carriage providing the motive power to rotate said control member and support member.

22 more elements

Abstract

Claims3