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US 4,747,709 AGranted
Printing apparatus with variable impact pressure
AssigneeCanon Kabushiki Kaisha
InventorsHiroyuki Ueda, Mitsuaki Seki
Life of this patent
Estimating the term…
Abstract
In a printing apparatus address data accesses an address of a time table to vary an impact pressure and supplementary data of each typeface (or character) of a printing type wheel. Thse data are stored in various memories. Data input/output and its processing are controlled by a plurality of microprocessors connected to each other through an interface.
Claims36
A printing apparatus comprising:
- a typefont structure having a plurality of type members thereon;
- a hammer for striking said type members to effect printing;
- hammer drive means for driving said hammer and energizable for different durations to control printing impression;
- a programmable timer coupled to said hammer drive means for controlling said durations;
- input means for inputting desired character information indicating a type member to be selected for printing;
- a time table storing a plurality of numbers having values equal to said durations;
- retrieving means responsive to information, including the character information, for retrieving desired durations from said time table and for supplying said retrieved desired durations to said programmable timer, said retrieving means including arithmetic means for performing a calculation to generate information for accessing said time table for retrieving the durations;
- selection information providing means responsive to desired character information from said input means for providing selection information for the selection of a desired one of said plurality of type members;
- and
- selecting means for performing the selection of said type member in response to the selection information;
- said retrieving means being operative, after the selection of said type member by said selecting means and lapse of a predetermined period of time, to access said time table in response to the information from said arithmetic means to retrieve the desired durations therefrom and to supply said retrieved desired durations to said programmable timer;
- said arithmetic means conducting said calculation to access said time table that stores the plurality of numbers, which have no direct relation to the character information corresponding thereto.
9 more elements
An output apparatus comprising:
- key input means capable of inputting desired character information;
- a typefont structure having a plurality of type members thereon;
- a hammer for striking said type members to effect printing;
- hammer drive means for driving said hammer and energizable for different operational durations to control printing impression;
- a programmable timer coupled to said hammer drive means for controlling the duration of energization of the hammer drive means;
- impression data providing means for providing impression data representing a component of the operational duration;
- a time table storing a plurality of numbers having values equal to said operational durations in units of time;
- and
- operable means, responsive to desired character information input by said key input means and the impression data provided by said impression data providing means, for calculating data for accessing said time table to retrieve operational durations from said time table and supply said retrieved operational durations to said programmable timer,
- said time table storing said numbers, which have no direct relation to the desired character information, that is accessed from said time table by the data calculated by said operable means.
7 more elements
Dependencies are inferred from the claim text.