JPH04246655A - Paper feeding device for electrophotograhic engraving machine - Google Patents

Abstract

PURPOSE:To prevent distortion and deformation in elongation and contraction caused by water of a photosensitive material which is set and left standing in a paper feeding device for an electrophotographic engraving machine. CONSTITUTION:A non moisture permeable sheet material 31 provided with flexibility follows the positional variance of the photosensitive material 2 which is pulled out from a loaded roll-type photosensitive material so as to always come into contact with the back surface of the supporting body of the pulled-out photosensitive material 2. Water coming out and going in the photosensitive material 2 can be prevented by use of the sheet material 31.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device for an electrophotographic engraving machine that loads and feeds a roll of photosensitive material (hereinafter referred to as a master roll) used in electrophotographic engraving.

0002

2. Description of the Related Art FIG. 6 is a perspective view showing an example of a general master roll.
(referred to as the master) 2 is wrapped. When loading such a master roll into an electrophotographic engraving machine,
As shown in FIG. 7, the rotating shaft 3 attached to the electrophotographic engraving machine is inserted through the inner diameter part of the core 1, and as shown in FIG. 8, the two flanges 4 attached to the electrophotographic engraving machine are inserted. A convex portion having a diameter slightly larger than the inner diameter of the winding core 1 provided on each end surface side is fitted onto both ends of the inner diameter portion of the winding core 1, respectively. Then, lift up both ends of the rotating shaft 3 and load it into the photosensitive material loading mechanism 10 of the electrophotographic engraving machine as shown in FIG.
Close.

As shown in FIG. 10, the cross-sectional structure of the master 2 includes a paper 21 as a support, the surface (photosensitive surface) of which is coated with an undercoat layer 22 and a ZnO/binder photosensitive layer 23, and the back surface coated with a backcoat layer 24. has been done.

0004

[Problems to be Solved by the Invention] The layers 22 and 23 coated on the front and back surfaces of the master 2 described above
Although 24 and 24 have a waterproof effect, they do not have the effect of blocking even water molecules, especially on the back surface. Therefore, if you load the master roll into the paper feeding device of an electrophotographic engraving machine, pull out the master 2, set it on the paper feed roller 11, and leave it for a while, the pulled out part of the master 2 will expand and contract due to the addition and removal of moisture. Strain deformation may occur. When the image on the original 13 is exposed through the lens 14 to the master 2 which has undergone this expansion/contraction strain deformation, for example, the master 2 which has been lifted as shown in FIG. If the image is included, there is a problem in that the photographed image is distorted by the l portion as shown in FIG.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to prevent expansion/contraction distortion deformation due to moisture in a master when it is set in a paper feeding device of an electrophotographic engraving machine and left unattended. An object of the present invention is to provide a paper feeding device for an electrophotographic engraving machine that can perform the following steps.

[0006]

[Means for Solving the Problems] The present invention relates to a paper feeding device for an electrophotographic engraving machine that loads and feeds a master roll used in electrophotographic engraving. This is achieved by providing a flexible, moisture-impermeable sheet material that can constantly contact the back surface of the photosensitive surface of the master, following the positional changes of the master pulled out from the master roll.

[0007]

[Operation] In this invention, a flexible moisture-impermeable sheet material is always in contact with the back surface of the photosensitive surface of the master pulled out from the master roll loaded in the paper feeding device of the electrophotographic engraving machine. Therefore, it is possible to block moisture from entering and exiting from that surface.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view schematically showing a paper feeding device for an electrophotographic engraving machine according to the present invention. A flexible, moisture-impermeable sheet-like base 31 (for example, made of polyethylene terephthalate (PET) with a thickness of 150 μm) is disposed on the base 16 .

Since this PET base 31 has flexibility, it can follow the positional changes of the master 2 pulled out from the master roll and always come into contact with the back surface of the photosensitive surface of the master 2, as shown in the figure. . Therefore, even if the master 2 is left for a while in the state shown in the figure, moisture can be prevented from entering and exiting from the back surface of the photosensitive surface of the pulled-out master 2.

[0010] In addition, a portion that cannot come into contact with the back side of the photosensitive surface of the master 2, for example, a cutter section 19 equipped with a fixed blade 17 and a rotary blade 18 for cutting the master 2, has its periphery as shown in the figure. Metallic guide 32, PET
By surrounding the base 33 and the Teflon base 34 to stagnate the air, it is possible to block moisture from entering and exiting the master 2. Note that since the photosensitive surface of the master 2 is easily damaged, a flexible Teflon base 34 is used for parts that may come into contact with that surface. Furthermore, by surrounding the master roll, it is also possible to block moisture from entering and exiting from the photosensitive surface of the master 2. In addition, instead of the above-mentioned PET base 31, a spring 39 is attached to the metal plate 38 as shown in FIG. It can always contact the back side of the photosensitive surface of the master 2 by following the positional changes of the master 2.

In the above-described embodiment, a paper feeding device of an electrophotographic engraving machine into which a master roll can be loaded has been described, but a sheet feeding type electrophotographic engraving machine using a master 2' cut to a predetermined length has been described. The present invention can also be applied to a paper feeding device.

FIG. 4 is a plan view showing an example, and FIG.
is its XX sectional view. P that covers the open surface of the storage box 35 that stores the master 2', excluding the sucker 36 that attracts the master 2' and the entrance and exit of the master 2'.
An ET base 37 is arranged on the storage box 35. Since the PET base 37 stagnates the air inside the storage box 35, it is possible to block moisture from entering and exiting the master 2'.

[0013]

Effects of the Invention According to the paper feeding device for an electrophotographic engraving machine of the present invention, it is possible to block moisture from entering and exiting the master when it is set and left unattended, and to prevent expansion and contraction distortion deformation of the master. Highly accurate captured images can always be obtained.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a paper feeding device of an electrophotographic engraving machine according to the present invention.

FIG. 2 is a plan view showing another example of the paper feeding device of the electrophotographic engraving machine of the present invention.

FIG. 3 is a plan view showing still another example of the paper feeding device of the electrophotographic engraving machine of the present invention.

FIG. 4 is a plan view showing a modification of the paper feeding device of the electrophotographic engraving machine of the present invention.

FIG. 5 is a sectional view taken along line XX of the paper feeding device of the electrophotographic engraving machine of the invention shown in FIG. 4;

FIG. 6 is a perspective view showing an example of a general master roll.

7 is a perspective view for explaining the loading procedure of the master roll shown in FIG. 6. FIG.

8 is a perspective view for explaining the loading procedure of the master roll shown in FIG. 6. FIG.

9 is a perspective view showing a state in which the master roll shown in FIG. 6 is loaded into a paper feeding device of a conventional electrophotographic engraving machine.

FIG. 10 is a diagram showing a cross-sectional structure of a master.

FIG. 11 is a perspective view for explaining a conventional problem.

FIG. 12 is a perspective view for explaining a conventional problem.

[Explanation of symbols]

2 Master 2’ Master 11 Paper feed roller 15 Ruled line 21 Paper 22 Undercoat layer 23 Photosensitive layer 24 Back coat layer 31 PET base 32 Guide 33 PET base 34 Teflon base 37 PET base 38 Metal plate 39 Spring

Claims (1)

[Claims] 1. In a paper feeding device of an electrophotographic engraving machine that loads and feeds a roll of photosensitive material used in electrophotographic engraving, it follows the positional change of the photosensitive material pulled out from the loaded roll of photosensitive material. 1. A paper feeding device for an electrophotographic engraving machine, comprising a flexible and moisture-impermeable sheet material that can always contact the back side of the photosensitive surface of the photosensitive material.