Printing – Stenciling – Rotary machines
Reexamination Certificate
2000-02-07
2001-08-21
Colilla, Daniel J. (Department: 2854)
Printing
Stenciling
Rotary machines
C101S119000, C101S117000
Reexamination Certificate
active
06276268
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the invention
The present invention relates to a drum type printer, and more particularly, to a drum type printer having a mechanism for adjusting a transverse position of a printed image.
2. Description of the Prior Art
In Japanese Patent Publication No. 2542489 issued Oct. 9, 1996, there is described a device for adjusting a transverse position of a printed image for a stencil printer having a drum unit rotatably supporting a cylindrical printing drum and slidably mounted in a body of the printer along the longitudinal axis of the printing drum, so as to be manually dismountable out of the printer body at the end of the sliding drawout movement, wherein the printed image transverse position adjustment device comprises guide means provided in the printer body for guiding the drum unit in the sliding direction, a movement transmission system for moving the drum unit in the sliding direction along the guide means for a minute distance, a motor for driving the movement transmission system, and clutch means for optionally connecting or disconnecting the movement transmission system to or from the drum unit.
In the printed image transverse position adjustment device of a stencil printer described in the above-mentioned patent publication, there is an inconvenience with regard to a multi-color superposition printing made by a plurality of printing drums that, when a required number of sheets of a multi-color print have been obtained in a manner such that the required number of sheets of a first print are obtained by using a first printing drum with an adjustment of a transverse position of a printed image, and then the required number of sheets of a second print are obtained by using a second printing drum replaced for the first printing drum with an adjustment of a transverse position of the printed image by the second printing drum, or further the required number of sheets of a third print are obtained by using a third printing drum replaced for the second printing drum with an adjustment of a transverse position of the printed image by the third printing drum, and so on, if a further number of sheets of the same multicolor print are required to be produced by using the first, second or third and other printing drums temporarily stored for an additional demand for the prints, the adjustment of the transverse position of the printed image must be repeated from the very beginning with respect to each of the first, second or third and other printing drums.
SUMMARY OF HE INVENTION
In view of the above-mentioned problems, it is a primary object of the present invention to provide a drum type printer improved so as not to require any readjustment of the transverse position of the printed image with respect to any of the printing drums in the monochromatic or multi-color superposition printing employing a plurality of printing drums when a transverse position of the printed image is once adjusted with respect to each of the printing drums, even when any of the printing drums is reused for a reprinting according to a reorder.
In order to accomplish the above-mentioned object, the present invention proposes a drum type printer comprising:
a machine frame,
a printing drum,
a back press roller for pressing a print sheet to the printing drum;
frame means for supporting the printing drum to be rotatable around a central axis thereof,
the machine frame having guide-hold means adapted to removably engage a part of the frame means for guiding and holding the frame means so as to be movable along the central axis of the printing drum, and drawably receiving the frame means and the printing drum supported thereby,
printed image transverse position adjustment means including a shift member mounted in the frame means so as to be shiftable along the central axis of the printing drum along a shift path relative to the frame means at least as much as a shift distance corresponding to a maximum value of an adjustment of a transverse position of a printed image, drive means for selectively shifting the shift member relative to the frame means along the shift path, and latch means for selectively latching the shift member at a part thereof to the machine frame when the frame means are at an installed position thereof in the machine frame, such that a shifting of the shift member relative to the frame means along the shift path effected by the drive means with the latch means latching the shift member to the machine frame adjusts the transverse position of the printed image.
By the above-mentioned construction of the drum type printer, the axial position of the printing drum relative to the machine frame for an adjustment of a transverse position of a printed image is determined by the position of an adjustment of the shift member relative to the frame means. Since the shift member is a member mounted in the frame means, even when the drum unit integrally constructed by the printing drum, the frame means and the shift member is returned to its installed position in the machine frame after it has once been removed out of the machine frame from the installed position, the once adjusted position of the shift member relative to the frame means does not change, and therefore, the adjustment of a transverse position of a printed image once made with respect to each drum unit is maintained as unchanged until a next readjustment thereof.
The shift member may be a shaft member having a screw portion and engaged in a tapped bore formed at a part of the frame means by the screw portion, and the drive means may be means for selectively driving the shaft member in rotation around a central axis thereof relative to the frame means.
The drive means may include a splined portion formed at another part the shaft member, a gear wheel engaging the splined portion, and an electric motor for driving the gear wheel in rotation.
The shaft member may be disposed in the frame means along the central axis of the printing drum.
There may be provided means for positioning the shift member at a latch position for latching the shift member to the frame member by the latch means.
REFERENCES:
patent: 4911069 (1990-03-01), Hayama et al.
patent: 5243904 (1993-09-01), Hayama et al.
patent: 5507225 (1996-04-01), Noguchi et al.
patent: 6076460 (2000-06-01), Kagawa
patent: B1 6192793 (2001-02-01), Motoe et al.
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patent: 4-361043 (1992-12-01), None
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patent: 2-2542489 (1996-07-01), None
patent: 9-1913 (1997-01-01), None
patent: 9-104159 (1997-04-01), None
Motoe Katsuro
Takahashi Yasuhiro
Watanabe Hitoshi
Colilla Daniel J.
Oliff & Berridg,e PLC
Riso Kagaku Corporation
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