JPH0627545A - Original platen - Google Patents

Abstract

PURPOSE:To easily place an original, to improve photographing accuracy and to prevent image from blurring and fogging caused by staining on a photographing surface by constituting an original holding means for holding the photographing surface of an original to be photographed and the opposite surface of the original of an electrostatic attracting mechanism. CONSTITUTION:The original platen 12 is constituted of an electrostatic attracting mechanism supporting member 15 including the electrostatic attracting mechanism 4 as the original holding means, a bearing part 16 for fixing the supporting member 15 on a device main body 11 and rotating the member 15 and a transparent sheet-like member 13 arranged in the device main body 11 and for deciding the photographing original position of the original 5. The original 5 is placed on the upper surface of the electrostatic attracting mechanism 4 so as to be attracted and held while the photographing original surface faces upward in a state where the electrostatic attracting mechanism 4 is positioned above the supporting member 15. The electrostatic attracting mechanism supporting member 15 is rotated in this state so that the original 5 may be in press-contact with the transparent sheet-like member 13 and held on it, and then, the original 5 is photographed. A positioning mark corresponding to an original size, cross stripes having even intervals, etc., are printed on the original attracting surface of the electrostatic attracting mechanism 4 so as to easily place the original.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an original table for holding an original provided in an electrophotographic plate making machine, an electrophotographic copying machine, a plate making machine using the silver complex salt diffusion transfer method, and the like. The present invention relates to a document table that can be simplified and can improve photographing accuracy.

[0002]

2. Description of the Related Art An image copying method using an electrophotographic system is used as an electrophotographic plate making machine in the field of light printing as well as an electrophotographic copying machine, and reflects light reflected from a document placed on a document table. In the former case, the photosensitive drum is exposed, and in the latter case, the electrophotographic planographic printing original plate having photoconductivity is exposed to form a toner image corresponding to the original image, and the toner image is transferred and fixed on the plain paper. It is used by making it hydrophilic (desensitizing). An image copying method using a silver complex salt diffusion transfer method is also known, and in the camera type, the reflected light from the original placed on the original table is similarly exposed to the silver halide emulsion layer and the non-image area is exposed. It is used in the preparation of printing plates and printing plates by diffusing silver halide and developing it.

In the image copying apparatus utilizing the electrophotographic method or the silver complex salt diffusion transfer method, since the manuscripts are generally exchanged manually by the copying person, once the copying conditions are set on the apparatus, The cause of the copy image defect is largely due to the problem of placing the original on the original table. Further, in the case where the originals are continuously copied while being exchanged, the final copy time is determined by the structure of the original table such as the ease of exchange work.

A document table in a console type plate-making machine, a copying machine or the like which has been generally used in the past usually has a document table on the upper surface of the main body of the apparatus.
The document table includes a glass plate on which a document is placed, and a document pressing lid that holds the placed document on the glass plate by pressure contact,
The document cover is attached to the apparatus main body by a hinge portion at one end of the glass plate, and is pivotally supported by the hinge portion. In order to perform plate making or copying, the original surface of the original to be photographed is placed on the glass plate of the original plate face down (on the glass plate side), the original is held by the original pressing lid, and the original is irradiated by the light source when the photographing starts. The light is reflected by the surface of the original, passes through a lens to form an image on the photosensitive material of the photographing unit, and is then subjected to toner development and fixing processing, and the printing plate or the copied paper is ejected.

In the apparatus having such a structure, the original is placed face down and aligned on the glass plate, and then the original pressing cover is pressed and held on the glass plate. The original may float, and the desired copy may not be obtained due to deviation from the pre-adjusted shooting position. The accuracy of the position cannot be confirmed with the original pressing lid, and the original placement is not easy. . Also, in the case of originals that have been cut and pasted or just corrected with white correction fluid, glue or correction fluid often adheres to the glass plate, which adversely affects the next copy. The glass surface including it must be kept clean at all times. Further, since the original table cannot be exchanged during the exposure on the original table having such a structure, the waiting time during the exposure becomes a dead time and the work efficiency is lowered.

Therefore, in order to solve the above problems, a document table as disclosed in Japanese Utility Model Publication Nos. 62-169341 and 62-169342 has been devised. In this document table, a cushion plate and a transparent body for sandwiching and fixing the document are arranged on both sides of the document table, and the document table is connected to the apparatus main body by a rotation shaft. In this manuscript table, the manuscript can be placed on the cushion plate of the manuscript table face up and can be pressure-bonded to the transparent body (a member such as a glass plate), so that the manuscript can be placed easily and accurately. There is. Further, since the replacement document can be placed on the surface of the document table opposite to the photographing surface during the exposure, the dead time during the exposure time is substantially eliminated.

The document table of such a system certainly simplifies the alignment of the document as compared with the conventional document table, but since the document is fixed by the sandwiching system, document misalignment may occur. If the document table is not fixed accurately, the distance between the shooting surface and the lens and the angle of the shooting surface may slightly change each time the document is replaced, causing image blurring. Further, since the original is exchanged by opening and closing the transparent body on the side opposite to the exposed side, fingerprints or the like may adhere to both sides of the transparent body to affect the copied image. Further, since the upper part of the apparatus is released during the rotation of the platen, it is necessary to consider the safety measures such as protection of the lens and the light source from falling objects such as dust.

[0008]

DISCLOSURE OF THE INVENTION The present invention relates to a document table in an apparatus for photographing a document while holding a document frame, and simplifies the placement of the document on the document table and improves the photographing accuracy. An object of the present invention is to provide a document table which does not adversely affect a copied image such as image blurring or dirt on the photographing surface, and a plate making machine or a copying machine using the document table.

[0009]

As a result of repeated studies for solving the above-mentioned problems, as a result of a document table in a device for holding a document and photographing the document, the surface opposite to the photographing surface of the photographed document. In a document table having at least one set of document holding means for holding the document holding means, the document holding means is achieved by a document table composed of an electrostatic attraction mechanism.

[0010]

The document table of the present invention is a document table in a device for holding and photographing a document, and has at least one set of document holding means for holding the surface of the photographed document opposite to the photographing surface. If the document holding means supporting member is of a rotating type, the document surface can be always mounted with the document surface facing upward, so that the position alignment at the time of placing the document is simplified, and the document is exchanged for fixing by the holding means. It is possible to prevent the document misalignment that is easily attracted due to, for example, and at the same time, to easily attach and detach the document.

Conventionally, the surface of the original to be photographed is sandwiched by pressure with a transparent member such as a glass plate, but the surface of the original opposite to the surface to be photographed is held by constituting the original holding means by an electrostatic attraction mechanism. Since the original can be placed and held, at least a transparent member for crimping and sandwiching the photographed original is not required, which simplifies the structure of the original holding means and reduces the weight, and further the opening and closing of the transparent member at the time of original replacement. Since the operation is eliminated, the efficiency of the document replacement work can be improved.

Particularly, in the document table in which the photographed document is positioned at the photographing position by rotating the document holding means, the document setting means can be simplified due to the weight reduction of the document holding means.
In a document table having electrostatic attraction mechanisms as document holding means on both sides of a rotating document holding means supporting member,
Even if another document is placed and held on the document holding means on the side opposite to the shooting surface, the vibration due to document replacement is less than that of the platen clamped by the transparent member. Originals can be exchanged without lowering.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of each part of the document table according to the present invention and the action which is or is intended for them will be described in detail below with reference to the document table shown in the drawings. The present invention is not limited to the embodiments as long as it does not deviate from the object.

Embodiment 1 As shown in FIG. 1, a document table 12 according to the present invention has an apparatus main body 11 not shown in detail of the structure for executing image copying.
Of the electrostatic attraction mechanism supporting member 15 including the electrostatic attraction mechanism 4 serving as a document holding means, and the electrostatic attraction mechanism support member 15 is fixed to the apparatus main body 11 to fix the electrostatic attraction mechanism support member 15. The bearing 16 for rotating and the apparatus main body 11
And a transparent plate-like member 13 that determines the position of the captured original of the original 5.

As shown in FIGS. 2 (A) and 2 (B), rotary shafts 19 are arranged at both side end portions of the electrostatic attraction mechanism support member 15, and at one end of the upper portion of the apparatus main body 11. The bearing 16 is installed so that it can be rotated in the directions of the double-headed arrow, and the handle 21 can be rotated approximately 180 degrees from the top of the apparatus main body 11 to the front side of the operating side for document exchange. As shown in FIG. 2 (A), the electrostatic attraction mechanism support member 15 rotated forward is held on the upper surface of the apparatus main body 11 by a support means (not shown) so that the bearing portion 16 is not overloaded, and the original document 5 Is a state in which the electrostatic attraction mechanism 4 is located on the upper surface of the electrostatic attraction mechanism support member 15,
The photographed document surface of the document 5 is placed on the upper surface of the electrostatic attraction mechanism 4 with the document surface facing upward, and is attracted and held. In a state where the original 5 is adsorbed and held, the electrostatic adsorption mechanism support member 15
Is rotated toward the transparent plate-shaped member 13 so that the original 5
Is crimped and held on the transparent plate-shaped member 13 which is the photographing position,
In the state as shown in FIG. 2B, the surface of the original document 5 to be photographed is placed downward at the photographing position for photographing.

As shown in FIG. 3A, a key mark 33 for positioning and a size corresponding to a specific original size are discriminated on the original attraction surface of the electrostatic attraction mechanism 4 for holding the original 5. Characters 34 to be obtained and grids 36 at equal intervals in the vertical and horizontal directions are printed so that the document can be easily placed. Further, as shown in FIG. 3A, the electrostatic attraction mechanism 4 is provided with an attraction control switch 31 and a power source 30.

As shown in FIG. 3B, the apparatus main body 11
A hollow rotating shaft 1 from a power supply 31 (not shown)
Power is supplied to the electrostatic adsorption mechanism 4 through the electric wire 18 in the cable 9. Further, as shown in FIG. 3C, the electrostatic attraction mechanism 4 is composed of a comb-teeth-shaped flat electrode 37, an electrostatic attraction sheet 38 and an insulating substrate 39 that sandwich the comb-shaped planar electrode 37, and the electrostatic attraction mechanism is supported. The member 15 is mounted so that the electrostatic attraction sheet 38 side of the electrostatic attraction mechanism 4 serves as a document attraction surface.
For example, the material described in JP-A-59-108915 can be effectively used. When the document 5 is attracted to the electrostatic attraction mechanism 4, the power source 30 is operated by the attraction control switch 31 to apply a voltage to the comb-shaped flat electrode 37, and the surface of the electrostatic attraction sheet 38 is charged by electrostatic action. The surface of the original 5 opposite to the photographing surface is attracted and held on the surface of the electrostatic attraction sheet 38 by the electrostatic attraction force. When the original is replaced, the power supply 30 is released by the attraction control switch 31. Then, the original 5 is peeled off.

Embodiment 2 FIG. 4 shows an embodiment of a document table 42 having electrostatic attraction mechanism supporting means 45 in which electrostatic attraction mechanisms 4a and 4b which are document holding means according to the present invention are arranged on both sides. Has been done.
The document table 42 is arranged on the upper part of the apparatus main body 41 (details of the structure for executing image copying is not shown), and as shown in FIG. 5, the electrostatic attraction mechanisms 4a and 4 which are document holding means.
The electrostatic attraction mechanism support member 45 including b, the bearing portion 46 rotatably rotatably supporting the electrostatic attraction mechanism support member 45, and the apparatus main body 41, and the electrostatic attraction mechanism holding member 45 of the original 5 is disposed. It is composed of a fixing means 43 for fixing the photographing original position.

The electrostatic attraction mechanism holding member 45 is rotatably movable on the upper surface of the apparatus main body 41 by a rotary shaft 49 protruding from the central portions of both side surfaces and a bearing portion 46 arranged on the apparatus main body 41. It is supposed to be. Further, since the upper part of the apparatus main body 41 is released during the rotation of the electrostatic attraction mechanism support member 45, a transparent member not shown is an electrostatic attraction mechanism holding member in order to protect the lens and the light source not shown from falling objects such as dust. It is arranged at a position that does not affect the rotation of 45.

As shown in FIG. 5A, the fixing means 43
When the electrostatic chucking mechanism holding member 45 is released,
It can be freely rotated in the direction of the arrow (or in the direction opposite to the arrow) around the center 9. The top surface of the electrostatic attraction mechanism holding member 45 (hereinafter,
The electrostatic attraction mechanism holding member 45, on which the original 5 is placed and held on the upper surface refers to the surface opposite to the photographing surface, is released by rotating the fixing means 43, as shown in FIG. 5B. Then, the original 5 is turned over to the side of the photographing surface 7 (the lower surface of the electrostatic attraction mechanism holding member 45). As a result, the surface of the photographed document 5 is positioned downward at the photographing position, and the fixing means 43 fixes the electrostatic attraction mechanism holding member 45 to the apparatus main body 41 for photographing, and at the same time, electrostatically. The upper surface of the suction mechanism holding member 45 is in a state in which originals can be exchanged or placed and held.

On both sides of the electrostatic attraction mechanism holding member 45, electrostatic attraction mechanisms 4a and 4b, which are exactly the same as the document holding means used in the first embodiment, are arranged. The electrostatic attraction mechanisms 4a and 4b have an attraction control switch 3 for controlling and operating each.
1 and a power supply 30 are attached. In order to hold the original document on the electrostatic attraction mechanisms 4a and 4b, the power source 30 is actuated on the desired original document attraction surface by the attraction control switch 31, and the surface of the electrostatic attraction mechanism 4a or 4b is charged by electrostatic action so that the original document 5 The surface opposite to the image capturing surface is attracted and held by electrostatic attraction, and the attraction control switch 3
Conversely, the suction operation means is released by 1 and the original 5 is peeled off.

As shown in FIG. 3D, the electrostatic attraction mechanism holding member 45 of this embodiment does not limit the rotation angle.
The conductor portion of a coaxial electric wire 47 having a coaxial structure in which a conductor and an insulator are laminated in a rotating shaft 49 is slidably contacted with an electric wire 48 wired from a power source (not shown) installed in the apparatus body 41, thereby rotating the electric wire. Power is supplied inside.

Embodiment 3 FIG. 6 shows an embodiment of a document table 62 having an electrostatic attraction mechanism holding member 65 on one side of which the electrostatic attraction mechanism 4 which is the document holding means according to the present invention is arranged. . Platen 62
Is disposed in front of the apparatus main body 61 (not shown in detail for the structure for executing image copying), and as shown in FIG.
An electrostatic attraction mechanism holding member 65 that supports the electrostatic attraction mechanism 4,
A bearing portion 66 that rotatably supports the electrostatic attraction mechanism holding member 65, and a placement position fixing unit 6 that is disposed on the apparatus main body 61 and fixes the electrostatic attraction mechanism holding member 65 when the document is held.
4 and a photographing position fixing means 63 which is arranged in the apparatus main body 61 and determines the photographing original position of the original 5.

As shown in FIG. 6 (A), the electrostatic attraction mechanism holding member 65 includes a rotary shaft 69 projecting from the central portions of both side surfaces thereof and a bearing portion 66 arranged on the main body 61 of the apparatus. The electrostatic attraction mechanism holding member 6 on the front surface of the main body 61
5 is rotatably movable. When the mounting position fixing means 64 is released, the electrostatic attraction mechanism holding member 65 is rotated around the rotation shaft 69 in the arrow direction. The electrostatic chucking mechanism holding member 6 is placed and held on the upper surface of the electrostatic chucking mechanism 4 with the original 5 photographing surface facing upward.
5, the placement position fixing means 64 is released, and the original document 5 is photographed as shown in FIG. 6B by rotating the original document 5 in the direction of the arrow to a position where the original surface of the original document 5 becomes parallel to the lens. The electrostatic attraction mechanism holding member 65 is positioned at the position, and the electrostatic attraction mechanism holding member 65 is fixed to the apparatus main body 61 by the photographing position fixing means 63 so that photographing is performed.

On one side of the electrostatic attraction mechanism holding member 65, an electrostatic attraction mechanism 4 exactly the same as the original holding means used in the first embodiment is mounted. In addition, the power feeding method is the same as in the first embodiment. An adsorption control switch 31 and a power source 30 are attached to the electrostatic adsorption mechanism 4. The document 5 is held on the electrostatic attraction mechanism 4 by using the attraction control switch 31.
As a result, the power source 30 is actuated, the surface of the electrostatic attraction mechanism 4 is charged by electrostatic action, and the surface of the original 5 opposite to the photographing surface is attracted and held by the electrostatic attraction force. At this time, the suction control switch 31 reversely releases the power source 30 and the original 5 is peeled off.

Embodiment 4 FIG. 7 shows an electrostatic attraction mechanism holding member 85 in which the electrostatic attraction mechanism 4 which is the document holding means according to the present invention is arranged on one side.
An example of a document table 82 having a is shown. Platen 8
2 is disposed in front of the apparatus main body 81 not shown in detail of the structure for executing image copying, and as shown in FIG. 7, the electrostatic attraction mechanism 4 and the electrostatic attraction mechanism supporting the electrostatic attraction mechanism 4. It is composed of a mechanism holding member 85.

The electrostatic attraction mechanism 4 has an attraction control switch 31.
And a power supply 30 is attached. In order to hold the document 5 on the electrostatic attraction mechanism 4, the power source 30 is operated by the attraction control switch 31, the surface of the electrostatic attraction mechanism 4 is charged by electrostatic action, and the surface of the document 5 on the opposite side of the photographing surface is charged. It is designed to be attracted and held by an electrostatic attraction force, and at the time of document replacement, the attraction control switch 31 reversely releases the power source 30 and the document 5
Is peeled off.

[0028]

According to the document table of the present invention, it is possible to place and hold a document regardless of the photographing position with the photographed document surface of the document facing upward, and moreover, the glass plate that has been used in the conventional document sandwiching and placing. Since a transparent plate-shaped member such as that described above is not required, the weight of the document holding means can be reduced, so that the document can be placed easily and with high position accuracy, and the document holding means holding the document can be moved to the photographing position by the structure of the document table device. Even if it is done, it has an excellent effect that it can be done easily.

[Brief description of drawings]

FIG. 1 is a schematic external perspective view showing a document table according to a first embodiment of the present invention.

FIG. 2 is an explanatory view showing an operation of document replacement on the document table according to the first embodiment of the present invention.

FIG. 3 is a schematic view showing an electrostatic attraction mechanism of a document table of the present invention,
A perspective schematic sectional view and a schematic perspective view of a power feeding portion.

FIG. 4 is a schematic external perspective view showing a document table according to a second embodiment of the present invention.

FIG. 5 is an explanatory view showing an operation of replacing a document on a document table according to the second embodiment of the present invention.

FIG. 6 is an explanatory view showing an operation of replacing a document on a document table according to a third embodiment of the present invention.

FIG. 7 is a schematic side sectional view showing a document table according to a fourth embodiment of the present invention.

[Explanation of symbols]

 4, 4a, 4b Electrostatic attraction mechanism 5 Originals 11, 41, 61, 81 Device main body 12, 42, 62, 82 Original table 13 Transparent plate member 15, 45, 65, 85 Electrostatic attraction mechanism support members 16, 46 , 66 Bearings 18, 48 Electric wires 19, 49, 69 Document rack rotating shaft 21 Handle 30 Adsorption control switch 31 Power supply 37 Planar electrode 38 Electrostatic adsorption sheet 39 Insulating substrate 43 Fixing means 47 Electric wire 63 Photographing position fixing means 64 Placement position Fixing means

Claims (1)

[Claims] 1. A document table in an apparatus for holding and photographing a document, the document table having at least one set of document holding means for holding a surface of a photographed document opposite to a photographing surface thereof. A document table characterized in that the document holding means is composed of an electrostatic attraction mechanism.