Printing – Stenciling
Reexamination Certificate
1999-10-04
2003-05-20
Nguyen, Anthony H. (Department: 2854)
Printing
Stenciling
C101S116000
Reexamination Certificate
active
06564706
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a stencil discharge apparatus for use in discharging a stencil sheet used in a stencil printing machine, and more particularly a stencil printing machine capable of accurately detecting a stored amount of used stencil sheets at the stencil discharge section, a stencil discharge device of a stencil printing machine and a stencil printing system.
2. Description of the Related Art
In the case of the stencil printing machine, it is necessary for discharging a stencil sheet fixed to a printing drum after completion of the printing operation prior to next perforating. The stencil discharging operation is carried out by a method wherein a peeling claw enters between the printing drum and the stencil sheet and the printing drum is rotated to feed out the stencil sheet into a discharge box. Within the discharge box are installed a compressing mechanism for compressing the stencil sheets or the like in order to increase a storing amount of the stencil sheets after their discharging operation.
Then, when the stored number of stencil sheets within the discharge box reaches a predetermined number of sheets (for example, it is filled with the sheets), the discharge box is taken out of the apparatus and the stencil sheets stored in the box are deposited.
The stencil sheet discharge apparatus is provided with a sensing means for sensing the number of sheets capable of being stored in the discharge box. This sensing means stores the present storing amount in a memory section, and calculates a residual amount of sheets in respect to the set number of sheets at an arithmetic section. In addition, there is also provided a filled amount sensing system for use in sensing a state when the discharge box is filled with sheets. Further, there is also provided a system combined with these devices.
However, in the case of these sensing means, it could not know an absolute capacity (a residual amount of discharge sheets) within the discharge box so long as the discharge box is taken out or the discharge box is not filled with discharge sheets.
In addition, since there was a certain difference in the number of discharge sheets capable of being stored in reference to a difference in the type of machine or state of application in use, a mechanism of sensing a residual amount of sheets detected through the memory section was required to have a predetermined surplus amount in the set value for the filled stencil sheets to be discharged. With such an arrangement as above, there was sometimes a possibility that the amount of discharge sheets capable of being stored in the discharge box was lower than an actual stored state.
Further, in the case that the discharge box is taken out during the operation, a stored state of the stencil sheets within the discharge box can not be discriminated accurately. For example, in the case of configuration in which the memory is cleared by taking-out the discharge box, if the stencil sheets within the discharge box are not deposited and the box is fixed again to the device, the residual amount of sheets in the memory is different from the actual value of the number of sheets.
In this case, even if the discharge box is filled with the sheets subsequently discharged, it is discriminated that the device is not filled with the sheets and an inferior discharge occurs (such as a jamming or the like). In addition, in the case that only part of the stencil sheets was taken out when the discharge box was taken out, a value at the memory section in the device was different from the stored state in the discharge box to produce an inconvenient state in operation.
The present invention has been invented in order to solve the aforesaid problems and it is an object of the present invention to provide a stencil printing machine capable of performing an accurate sensing of a stored state of the stencil sheets in the discharge box and further informing an appropriate time of deposition for the sheets, a stencil discharge apparatus for the stencil printing machine and a stencil printing system.
SUMMARY OF THE INVENTION
According to a first aspect of this invention, there is provided a stencil discharge apparatus for a stencil printing machine having a discharge box for storing a predetermined amount of stencil sheets after being peeled off from a printing drum so as to discharge said stencil sheets. The stencil discharge apparatus includes compressing means for compressing the stencil sheets discharged into said discharge box through motion of a compressing plate; compressing pressure sensing means for sensing and outputting a compressing pressure of said compressing means; moving amount sensing means for sensing and outputting an amount of motion of said compressing plate; and control means for calculating a storing amount of the stencil sheets in said discharge box on the basis of sensing of a predetermined pressure through said compressing pressure sensing means and an amount of motion sensed by said moving amount sensing means.
In accordance with the aforesaid configuration, the stencil sheets are compressed by the compressing means every time the stencil sheets are stored (discharged) into the discharge box. The control means calculates a storing amount of the stencil sheets in response to a moving amount of the compressing plate during compressing operation. Since the storing state in the discharge box can be directly sensed through motion of the compressing plate, it becomes possible to calculate an accurate amount of discharging stencil sheets.
According to a second aspect of this invention, in the first aspect of the present invention, there can be provided a stencil discharge apparatus for a stencil printing machine in which said control means calculates a residual amount of sheets capable of being stored in said discharge box in response to a limited storing amount of said discharge box and an amount of motion of said compressing means.
In accordance with the aforesaid configuration, the control means is enabled to know a dischargeable amount of said sheets every time in order to calculate a residual amount of the discharge sheets.
According to a third aspect of this invention, in the first or the second aspect of the present invention, there can be provided a stencil discharge apparatus for a stencil printing machine having a display device for displaying a storing amount of said stencil sheets or a residual amount which can be stored.
In accordance with the aforesaid configuration, a storing amount of the stencil sheets and/or a residual amount which can be stored is displayed on the display device and it can be easily confirmed.
According to a fourth aspect of this invention, in the first aspect of the present invention, there can be provided a stencil discharge apparatus for a stencil printing machine in which said control means alarms when the residual amount becomes less than a specified value in response to a storing limit amount of said discharge box and an amount of motion of said compressing means.
In accordance with the aforesaid configuration, since the external informing operation is carried out when the residual amount in the discharge box becomes less than a specified value, it becomes possible to inform the discharging of stencil sheets in the discharge box at a proper time and deposit the sheets.
In accordance with a fifth aspect this invention, in the first aspect of the present invention, there can be provided a stencil discharge apparatus for a stencil printing machine in which said control means includes a memory means for storing a storing amount of stencil sheets within said discharge box; the storing amount of the stencil sheets stored within said discharge box is calculated on the basis of an amount of motion sensed by said moving amount sensing means when said compressing pressure sensing means senses a predetermined pressure upon compressing the stencil sheet with the compressing means; and the storing amount of the stencil sheet is stored in said memory means.
In accordance with
Miyaki Makoto
Morita Naoki
Kanesaka & Takeuchi
Nguyen Anthony H.
Riso Kagaku Corporation
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