Printing – Stenciling – Rotary machines
Reexamination Certificate
2000-04-06
2001-02-13
Eickholt, Eugene (Department: 2854)
Printing
Stenciling
Rotary machines
C101S118000, C101S119000, C101S128400, C101S477000
Reexamination Certificate
active
06186062
ABSTRACT:
BACKGROUND OF THE INVENTION
DETAILED DESCRIPTION OF THE INVENTION
1. Field of the Invention
The present invention relates to a stencil printing apparatus that allows normal stencil printing to be restarted at the first print sheet even after a long rest.
2. Prior Art
A stencil printing apparatus prints out a desired image on a print sheet by winding a stencil sheet perforated in a stencil making section on a printing drum and pinching the print paper fed from a sheet supply section between a roller and the printing drum.
Such a stencil printing apparatus, when left for a long time with no operation, often causes the ink existing on inner and outer surfaces of the drum including the openings, etc., as well as between the drum and a stencil sheet, etc. to dry.
Consequently, when a stencil making and printing operation is restarted after a long rest, it is difficult to supply a proper amount of ink onto the inner and outer surfaces of the drum and to between the drum and a stencil sheet. It is thus hardly possible to secure a normal print density at the first print sheet. The print image will thus be apt to become faint, and accordingly, quite a lot of print sheets are usually wasted until a desired print quality is obtained. This has arisen problems such as an increase in the printing cost, requirement of a long printing time, etc. The major factors of those problems are items (1) and (2) described below.
(1) The ink existing in the printing drum section, as well as between the printing drum section and a stencil sheet dries while the apparatus is at rest and a proper amount of ink for normal printing cannot be secured.
(2) The used stencil sheet for printing must be removed from the printing drum and discharged before a newly perforated stencil sheet is wound on the printing drum. The used stencil sheet often bears considerably much ink even when it is discharged.
The viscosity of the ink used for stencil printing depends significantly on the ambient temperature, as well as on how long the apparatus is left at rest. Consequently, even when the ink is kept under a low temperature for a long time, a faint image problem often occurs.
SUMMARY OF THE INVENTION
Under such the circumstances, it is an object of the present invention to provide a stencil printing apparatus that assures normal stencil printing to be restarted at the first print sheet even after a long rest.
The stencil printing apparatus in the first embodiment of the present invention comprises a stencil making means for perforating each stencil sheet with a desired image pattern; a porous structure printing drum incorporating an ink supply mechanism to be wound with the stencil sheet perforated by the stencil making means; a sheet supply means for supplying print sheets; a roller for pinching the print sheet supplied from the sheet supply means between the printing drum and itself; and time counting means for counting the rest time of the stencil printing apparatus. In addition, the stencil printing apparatus further comprises controlling means for controlling before the apparatus is started up so that a non-perforated stencil sheet is wound on the printing drum, supply of print sheets from the sheet supply means is inhibited, and the printing drum is rotated, thereby the pinching time between the printing drum and the roller is changed according to the time data counted by the time counting means.
The stencil printing apparatus in the second embodiment of the present invention comprises a stencil making means for perforating each stencil sheet with a desired image pattern; a porous structure printing drum incorporating an ink supply mechanism to be wound with the stencil sheet perforated by the stencil making means; a roller for pinching the print sheet supplied from the sheet supply means between the printing drum and itself; and temperature detecting means for detecting the temperature in the printing drum. In addition, the stencil printing apparatus further comprises controlling means for controlling before the apparatus is started up so that a non-perforated stencil sheet is wound on the printing drum and the printing drum is rotated while supply of print sheets from the sheet supply means is inhibited, thereby the pinching time between the printing drum and the roller is changed according to the temperature data detected by the temperature detecting means.
The stencil printing apparatus in the third embodiment of the present invention comprises a stencil making means for perforating each stencil sheet with a desired image pattern; a porous structure printing drum incorporating an ink supply mechanism to be wound with the stencil sheet perforated by the stencil making means; a sheet supply means for supplying print sheets; a roller for pinching the print sheet supplied from the sheet supply means between the printing drum and itself; time counting means for counting the no-operation time of the stencil printing apparatus; and temperature detecting means for detecting the temperature in the printing drum. In addition, the stencil printing apparatus further comprises controlling means for controlling before the apparatus is started up so that a non-perforated stencil sheet is wound on the printing drum, supply of print sheets from the sheet supply means is inhibited, and the printing drum is rotated, thereby the pinching time between the printing drum and the roller is changed according to the time data counted by the time counting means and the temperature information detected by the temperature detecting means.
The stencil printing apparatus in the fourth embodiment of the present invention comprises a stencil making means for perforating each stencil sheet with a desired image pattern; a porous structure printing drum incorporating an ink supply mechanism to be wound with the stencil sheet perforated by the stencil making means; a sheet supply means for supplying print sheets; a roller for pinching the print sheet supplied from the sheet supply means between the printing drum and itself; time counting means for counting the no-operation time of the stencil printing apparatus; and storing means for storing data corresponding to the time of the pinching frequency between the printing drum and the roller. In addition, the stencil printing apparatus further comprises controlling means for controlling so that a non-perforated stencil sheet is wound on the printing drum, supply of print sheets from the sheet supply means is inhibited, the printing drum on which the non-perforated stencil sheet is wound is rotated, and the pinching frequency data is read from the storing means according to the time counted by the time counting means, thereby the pinching between the printing drum and the roller is changed according to this read pinching frequency before a stencil making operation is performed by the stencil printing apparatus.
The stencil printing apparatus in the fifth embodiment of the present invention comprises a stencil making means for perforating each stencil sheet with a desired image pattern; a porous structure printing drum incorporating an ink supply mechanism to be wound with the stencil sheet perforated by the stencil making means; a sheet supply means for supplying print sheets; a roller for pinching the print sheet supplied from the sheet supply means between the printing drum and itself; temperature detecting means for detecting the temperature in the printing drum; and storing means for storing data corresponding to the temperature of the pinching frequency between the printing drum and the roller. In addition, the stencil printing apparatus further comprises controlling means for controlling so that a non-perforated stencil sheet is wound on the printing drum, supply of print sheets from the sheet supply means is inhibited, the printing drum on which the non-perforated stencil sheet is wound is rotated, and the pinching frequency data is read from the storing means according to the temperature detected by the temperature detecting means, thereby the pinching between the printing drum and the roller is
Eickholt Eugene
Kanesaka & Takeuchi
Riso Kagaku Corporation
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