Device for parallel justification of print head relative to the

Details Device for parallel justification of print head relative to the Device for parallel justification of print head relative to the

1998-02-20

1999-12-28

Yan, Ren

Typewriting machines

Means auxiliary to typewriting function

Frame, casing, or support for typewriter

400 55, B41J 2902

Patent

active

060072636

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to printers.


BACKGROUND ART

Conventionally, handy printers are known which are capable of printing desired information easily at a desired place.
In a printer of this type, for example, a printing tape cassette, which is provided with an ink ribbon and a printing tape, is removably set in the printer body. The ink ribbon and the printing tape are disposed in an overlapping manner between a print head and a platen roller in the printer body. In such a state, the platen roller presses the printing tape and the ink ribbon against the print head, and the platen roller is then rotated to feed the ink ribbon and the printing tape while the print head is being driven in accordance with print information to print desired information on the printing tape.
In this printer, the print head and the platen roller are disposed in an upstanding manner within the printer body so as to be closable with respect to each other. When the tape cassette is set within the printer body, the print head and the platen roller are moved away from each other, the ink ribbon and the printing tape are inserted from above in an overlapping manner in between the spaced print head and the platen roller. In printing, the platen roller approaches the print head to press the ink ribbon and the printing tape against the print head. The print head is attached to an upstanding protective member fixed at a lower end to a chassis attached within the printer body. The platen roller is attached rotatably at an upper and at a lower end to a support member which in turn is attached turnably to an upstanding support shaft, which is fixed at a lower end to the chassis. The support member is turned around the support shaft so as to move toward/away from the print head.
In such a printer, the protective member of the print head and the support shaft of the platen roller are fixed only at their lower ends to the chassis in an upstanding manner, but they are not fixed at their upper ends. Thus, by pressing the platen roller against the print head, the print head is likely to move away at its upper portion from the platen roller. Thus, the print head and the platen roller cannot be brought into uniform contact with each other through their lengths, so that there is a difference in printing state between the upper and the lower portions of the print head. As a result, uniform printing cannot be achieved and there is a deterioration in the print quality.
Such a problem would also arise in a structure in which the platen roller is fixed and in which the print head moves toward/away from the platen roller. In particular, when the respective lengths of the print head and the platen roller are increased to use a wider printing tape, the above described problem would be striking.


DISCLOSURE OF INVENTION

It is therefore an object of the present invention to provide a printer which prevents the print head and the platen roller from moving at one end from each other, and presses the print head and the platen with uniform pressure to improve the printing quality.
In order to achieve the above object, the present invention provides a printer in which at least one of a print head and a platen is attached at one end to a printer body, and any one of the print head and the platen moves to separably press the other of the print head and the platen, comprising: and printer body for engaging disengageably with the other end of the at least one of the print head and the platen to restrict the print head and the platen roller at a predetermined space from each other.
Thus, the space restricting member attached to any one of the print head, platen and the printer body is engaged with the other end of at least one of the print head and the platen to restrict the print head and the platen at a constant distance from each other. Thus, in printing, the print head and the platen are placed so as not to move away from each other to thereby press both uniformly against each other. Accordingly, there is no difference in printing state b

REFERENCES:
patent: 4497682 (1985-02-01), Hamisch, Jr.
patent: 4944621 (1990-07-01), Uecker
patent: 4966476 (1990-10-01), Kuzuya et al.
patent: 5051009 (1991-09-01), Sugiura et al.
patent: 5366302 (1994-11-01), Masamura et al.

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