Printing – Stenciling – Rotary machines
Reexamination Certificate
1998-10-02
2001-05-08
Hilten, John S. (Department: 2854)
Printing
Stenciling
Rotary machines
C101S118000
Reexamination Certificate
active
06227107
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a stencil printer, and more particularly to a stencil printer in which a printing drum is removably mounted on a printer body.
2. Description of the Related Art
In a rotary press type stencil printer, the printing drum is mounted in a printer body to be rotatable about a predetermined axis of rotation, and is removed from the printer body by moving the printing drum in the direction of the axis of rotation. By removing the printing drum, maintenance of the printer body is facilitated, for instance, when the rotation of the printing drum becomes out of synchronization with paper supply or the printer gets jammed with paper. In such a case, rollers and or a paper drum for conveying the printing paper can become stained with ink, and accordingly the rollers and the paper drum must be cleaned and maintenance must be performed.
However, conventionally, since the inside of the printer body is dark, the stained part and/or malfunctioning parts are difficult to view and maintenance is very difficult.
SUMMARY OF THE INVENTION
In view of the foregoing observations and description, the primary object of the present invention is to provide a stencil printer in which maintenance of the printer body is facilitated.
The stencil printer of the present invention is one comprising a rotary printing drum removably supported in the printer body and is characterized by having
a lamp means provided inside the printer body, and
a control means which, in response to an action necessary for maintenance inside the printer body, turns in the lamp means.
The action necessary for maintenance of the printer body may be any action such as opening the door of the printer body, removal of the printing drum, and the like which are necessary for checking the inside of the printer body, removal of jammed paper and cleaning of rollers and/or a paper drum stained with ink. This action will be simply referred to as “a maintenance action”, hereinbelow.
For example, the control means may be provided with a detecting means which detects removal of the printing drum and may turn on the lamp means when the detecting means detects that the printing drum has been removed from the printer body.
Otherwise the control means may comprise a detecting means which detects removal of the printing drum and a switch means which can turned on the lamp means only when the detecting means detects that the printing drum has been removed from the printer body.
In this case, it is preferred that a drum takeout switch which is operated to permit the printing drum to be removed from the printer body doubles as said switch means.
Preferably the lamp means is disposed in a position where it can illuminate the space for the printing drum.
In the stencil printer of the present invention, since the lamp means is turned on in response to a maintenance action, the inside of the printer body can be illuminated by the lamp means when maintenance is to be carried out. Accordingly cleaning of the rollers or the drum for conveying printing paper sheets and/or inspection of the parts is facilitated.
When the lamp means is arranged to be turned on when the detecting means detects that the printing drum has been removed from the printer body, the lamp means can be automatically turned on in response to removal of the printing drum without the necessity of any additional action.
Further by providing a switch means which can turned on the lamp means only when the detecting means detects that the printing drum has been removed from the printer body, it becomes possible to turn on the lamp means only when necessary and power consumption can be reduced.
When the drum takeout button doubles as the switch for turning on the lamp means, the number of components of the printer is reduced and the manufacturing cost of the printer can be reduced.
By disposing the lamp means in a position where it can illuminate the space where the printing drum exists, the space can be surely illuminated when the printing drum is removed and maintenance is further facilitated.
REFERENCES:
patent: 3941053 (1976-03-01), Black et al.
patent: 4030409 (1977-06-01), Adhikari et al.
patent: 4088800 (1978-05-01), Nicholson
patent: 4123569 (1978-10-01), Peterson et al.
patent: 5507225 (1996-04-01), Noguchi
patent: 5537920 (1996-07-01), Hasegawa et al.
patent: 5609101 (1997-03-01), Oyama et al.
patent: 5694841 (1997-12-01), Sato
patent: 0040179 (1986-02-01), None
Bansyo Toshihiro
Hashimoto Tetsuya
Miyata Masakazu
Watanabe Hitoshi
Hilten John S.
Nguyen Anthony H.
Nixon & Peabody LLP
Riso Kagaku Corporation
Studebaker Donald R.
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