Impression control mechanism for a typewriter
AssigneeSilver Seiko Ltd.
InventorTetsuma Asahi
Life of this patent
Estimating the term…
Abstract
Print impression control mechanism for regulating the impact velocity of a single element printing head against a platen. The printing head is normally retained to a rest position which is in a fixedly spaced relationship to the platen independent of manual adjustment of an impression control lever so as to provide best visibility of printed characters on the record medium. In a first part of each print cycle, the head is brought to an intermediate position from which it is accelerated to get sufficient velocity for printing in a subsequent second part of the print cycle. Such an intermediate position is determined depending upon manual adjustment of the control lever whereby the impression of the printed characters can be determined accordingly.
Claims6
An impression control mechanism for a single element typewriter, comprising:
- a platen;
- a single printing element;
- means mounting said printing element for movement from a fixed rest position towards said platen;
- means for defining said fixed rest position of said element;
- means for urging said element towards said rest position;
- cyclically operable print drive means operable in a particular part of each print cycle for driving said printing element to move towards said platen until a predetermined position is reached whereafter said printing element moves by its own inertia;
- manually adjustable impression control means for selectively defining an intermediate position of said printing element between said rest position and said predetermined position to thereby define a distance over which said printing element is driven by said print drive means within said particular part of each print cycle;
- and
- means operable in another part of each print cycle immediately preceding said particular part for bringing said printing element from said rest position to the selectively defined intermediate position;
- wherein said printing element is normally positioned at said fixed rest position independent of said manually adjustable impression control means to thereby provide an operator of the typewriter with optimum visibility of the printed characters.
An impression control mechanism for a single element typewriter, comprising:
- a platen;
- a single printing element;
- means mounting said printing element for movement from a fixed rest position towards said platen;
- means for defining said fixed rest position of said element;
- means for urging said element towards said rest position;
- a cyclically operable print drive cam having a cam profile including a first part for displacing said printing element from said rest to an intermediate position without providing said printing element with substantial energy for printing, and a second part for accelerating said printing element to provide said printing element with energy for printing;
- a cam follower mounted for engagement with said print drive cam;
- and
- manually adjustable motion transmitting means interposed between said cam follower and said means for mounting for transmitting motion of said cam follower to said printing element and manually adjustable to determine when the transmission of motion is to be initiated while said cam follower is acted upon by the cam profile part of said print drive cam, thereby determining a distance over which said printing element is driven by said second cam profile part of said print drive cam;
- said printing element being normally positioned at said fixed rest position independent of said manually adjustable impression control means to thereby provide an operator of the typewriter with optimum visibility of the printed characters.
An impression control mechanism for a single element typewriter, comprising:
- a platen;
- a single printing element;
- means mounting said printing element for movement from a fixed rest position towards said platen;
- means for defining said fixed rest position of said element;
- means for urging said element towards said rest position;
- a cyclically operable print drive cam having a cam profile including a first part for displacing said printing element from said rest position towards said platen without providing substantial energy for printing to said printing element and a second part contiguous to said first part for driving said printing element until a predetermined position is reached to provide substantial energy for printing to said printing element;
- motion transmitting means interposed between said cam and said means for mounting for transmitting motion of said cam to said printing element;
- and
- manually adjustable impression control means for defining a first distance over which said printing element is displaced from said rest position by the action of said first part of said cam profile of said cam to thereby define a second distance to said predetermined position over which said printing element is driven by said second part of said cam profile;
- said printing element being normally positioned at said fixed rest position independent of said manually adjustable impression control means to thereby provide an operator of the typewriter with optimum visibility of the printed characters.
Dependencies are inferred from the claim text.