Justification data calculator and display device

Claim 2

In a character-by-character printEr of the proportional spacing type having an impositively driven letter feeding part movable along a printing line in multiples of a relatively small basic increment, the line length indicator mechanism comprising: a movable display member comprising a relatively large tube mounted for laterally sliding movement at a forward position in said printer adjacent said letter feeding part, resilient energy means operatively connected to said display member for urging relative movement thereof in a direction indicative of increasing printing line length, and a right margin mechanism partially defining a desired line length, and including: a latch member that is normally operatively connected with said display member to prevent movement thereof by said resilient energy means, means responsive to movement of said letter feeding part into a predetermined proximity relative to said right margin mechanism for releasing said latch member from its movement preventing connection with said display member, motion amplifying gear means, a first abutment operatively connected to said letter feeding part, and a second abutment operatively connected through said motion amplifying gear means to said display member and cooperatively engaging said first abutment whenever said letter feeding part is within said predetermined proximity for limiting movement of said display member to correspond to movement of said letter feeding part.

Claim 3

In a character-by-character printer having an impositively driven letter feeding part movable along a printing line, the line length indicator mechanism comprising: a movable display member, resilient energy means operatively connected to said display member for urging relative movement thereof in a direction indicative of increasing printing line length, a substantially stationary rack extending parallel to said printing line, a right margin mechanism partially defining a desired line length adjustably secured to said stationary rack under the control of a manual lever, and including: a latch member that is normally operatively connected with said display member to prevent movement thereof by said resilient energy means, means responsive to movement of said letter feeding part into a predetermined proximity relative to said right margin mechanism for releasing said latch member from its movement preventing connection with said display member, a first abutment operatively connected to said letter feeding part, a second abutment, an elongated transfer rack connected in motion transfer relationship to said display member and releasably connected at a selective point along the length thereof with said second abutment, said first and second abutments mutually cooperatively engaging one another whenever said letter feeding part is within said predetermined proximity for limiting movement of said display member to correspond to movement of said letter feeding part, and means responsive to margin adjusting movement of said manual lever for freeing said releasable connection between said second abutment and said transfer rack and for locking said display member against movement by said resilient energy means.

Claim 4

In a character-by-character printer having an impositively driven letter feeding part movable along a printing line, the line length indicator mechanism comprising: a movable display member, resilient energy means operatively connected to said display member for urging relative movement thereof in a direction indicative of increasing printing line length, a substantially stationary rack extending parallel to said printing line, a right margin mechanism partially defining a desired line length adjustably secured to said stationary rack under the control of a manual lever, and including: a latch member that is normally operatively connected with said display member to prevent movement thereof by said resilient energy means, means responsive to movement of said letter feeding part into a predetermined proximity relative to said right margin mechanism for releasing said latch member from its movement preventing connection with said display member, a first abutment operatively connected to said letter feeding part, a second abutment, an elongated transfer rack connected in motion transfer relationship to said display member and releasably connected at a selective point along the length thereof with said second abutment, said first and second abutments mutually cooperatively engaging one another whenever said letter feeding part is within said predetermined proximity for limiting movement of said display member to correspond to movement of said letter feeding part, and means responsive to margin adjusting movement of said manual lever for freeing said releasable connection between said second abutment and said transfer rack and for locking said display member against movement by said resilient energy means.