JPH06110138A - Electrostatic drum electrifying device - Google Patents

Abstract

PURPOSE:To easily stabilize the electrification of electrostatic charge on the surface of an electrostatic drum and to simplify the attaching/detaching operation of the drum. CONSTITUTION:A connecting terminal 410 made of phosphor bronze, which conducts between a photosensitive material drum 310 and a high voltage power source unit 401 is provided with a contact projection 414 of a tip part 411. When the drum 310 is incorporated, the terminal 410 has property as what is called, a leaf spring so that the shape shown by an alternate long and two short dashes line may become that shown by a continuous line in figure. The tip of the projection 414 of the terminal 410 comes in contact with the center of the end face of an end shaft 312 in terms of point. In such a case, the projection 414 is pressed toward the end face of the shaft 312 caused by the property as the leaf spring possessed by the terminal 410. When DC voltage is impressed on the drum 310 through the terminal 410, the electrification of the high-potential electrostatic charge is performed to the surface of the drum body 311 of the drum 310.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic drum applying device for applying a charging DC voltage to an electrostatic drum for charging electrostatic charges on the surface of a drum.

[0002]

2. Description of the Related Art An electrostatic drum which receives a direct current voltage for charging from an electrostatic drum applying device of this kind charges a surface of the drum with an electrostatic charge, thereby recording paper or film in a copying machine or plate making. A photosensitive material in a copying camera such as a commercial camera is adsorbed to and held on the drum surface. In applying a DC voltage to the electrostatic drum, for example, in Japanese Patent Laid-Open No. 64-72136, the power source of the DC voltage for charging and the electrostatic drum are brought into contact with the outer peripheral surface of the central axis of the electrostatic drum. A connection terminal is used to establish continuity with.

As shown in FIG. 5, such a connecting terminal T is formed as a bifurcated leaf spring so as to sandwich the central axis C of the electrostatic drum D from both sides on the outer periphery thereof. By doing so, cost reduction is achieved.

[0004]

However, in the conventional electrostatic drum applying device, the following problems remain unsolved. Connection terminal T to the above-mentioned electrostatic drum D
When the electrostatic drum D is eccentrically rotated when a DC voltage is applied using, the contact state between the outer periphery of the central axis C and the contact surface of the connection terminal T changes due to the rotation of the electrostatic drum D. Therefore, since the contact resistance fluctuates, the application of the DC voltage to the electrostatic drum D becomes unstable, and the electrostatic charge on the surface of the electrostatic drum is not stable.

As described above, when the electrostatic drum D is used as a holding drum for a photosensitive material in a copying camera, if the electrostatic charge on the surface of the electrostatic drum is unstable, the adsorption state of the photosensitive material also changes. Therefore, there are the following inconveniences. For example, the photosensitive material adsorbed on the drum surface may fall off from the drum surface during rotation of the drum, that is, during exposure of the photosensitive material,
There may be a gap. Therefore, exposure becomes impossible or defective.

By the way, the vibration of the photosensitive material holding drum in the copying camera has a great adverse effect on the product quality of the copying camera. However, since the holding drum does not rotate at high speed, the holding drum does not vibrate due to the eccentric rotation. Therefore, even if the holding drum has some eccentricity, the eccentricity does not deteriorate the product quality.

Therefore, at the connection terminal T, the drum should not be eccentric in order to stabilize the electrostatic charge on the surface of the drum, although some eccentricity is allowed in the drum. I had to do it. Specifically, it has been necessary to increase the dimensional accuracy and assembly accuracy of the drum more than necessary, measure the degree of eccentricity every predetermined time, and perform eccentricity adjustment again based on the result. Since the adjustment of the eccentricity of the drum requires a high degree of skill and a great deal of labor, the electrostatic charge on the surface of the drum cannot be stabilized without such effort.

In addition to the photosensitive material holding drum in the copying camera, the surface of the electrostatic drum D is charged with electrostatic charge, and therefore, in addition to the sensitive material, the recording paper, and the object to be attracted, dust and Dust may be adsorbed. In addition, the surface of the drum may be scratched for some reason. In such a case, maintenance work is required to remove these inconveniences by removing the drum from the device body. However, since the outer periphery of the central shaft C is sandwiched by the connecting terminals T from both sides, only the vertical drum attaching / detaching operation is allowed when attaching / detaching the connecting terminals T and the electrostatic drum D.
The operation was difficult.

The present invention has been made to solve the above problems, and it is an object of the present invention to easily stabilize the electrostatic charge on the surface of a drum and to simplify the mounting and demounting operation of the drum.

[0010]

In order to achieve the above object, the means adopted by the present invention is provided with a drum which rotates integrally with a rotatably supported central shaft and which is applied from the central shaft. An electrostatic drum applying device for applying a charging DC voltage to an electrostatic drum for electrostatically charging the surface of the drum with a DC voltage, wherein the electrostatic drum applying device makes point contact with the end face of the central axis of the electrostatic drum, The gist of the present invention is to include a conductive connection terminal for electrically connecting the power source of the charging DC voltage and the electrostatic drum, and a biasing means for biasing the conductive connection terminal toward the end face of the central shaft. To do.

[0011]

In the electrostatic drum applying device having the above structure, the conductive connecting terminal is biased toward the central axis end surface by the biasing means, and the conductive connecting terminal is brought into point contact with the central axis end surface of the electrostatic drum. That is, when the conductive connecting terminal is brought into contact with the central axis of the electrostatic drum, the contact is made point contact, and the contact position is the central axis end surface of the electrostatic drum.

Therefore, regardless of whether or not the electrostatic drum is eccentric,
The contact state between the end face of the central shaft and the conductive connecting terminal can be maintained in an almost initial state, and the contact resistance can be set to a substantially uniform value. In addition, since the conductive connecting terminal is biased toward the end face of the central axis, the contact state is maintained almost in the initial state regardless of the displacement along the central axis of the electrostatic drum. The contact resistance can be set to a substantially uniform value. Furthermore, since the contact position is on the end face of the central shaft, there is no restriction on the attaching / detaching operation direction of the drum when attaching / detaching the conductive connection terminal and the electrostatic drum.

[0013]

Preferred embodiments of the present invention will be described below in order to further clarify the structure and operation of the present invention described above. In this embodiment, the electrostatic drum applying device of the present invention is used as a device for applying a DC voltage to a photosensitive material drum in a slit exposure type copying camera. FIG. 1 is an explanatory diagram showing an overall configuration of a slit exposure type copying camera 20 (hereinafter, simply referred to as a copying camera 20) having an electrostatic drum applying device according to the embodiment as viewed from the front and side.

As shown, the copy camera 20
A base body 40 accommodating the electronic control unit 30 and the like; a document rack unit 100 incorporating a mechanism for assembling on the base body 40 to convey the document rack 50 in the horizontal direction;
It is composed of an optical unit 200 and a drum unit 300 which are integrally assembled above the document rack unit 100. On the drum unit 300, two magazines A and B containing roll-shaped photosensitive materials can be mounted, and a collection box 305 for collecting the exposed photosensitive materials.
Can be attached. The magazines A and B are the same, but here, the magazine mounted on the upper side is called the upper magazine A and the magazine mounted on the lower side is called the lower magazine B.

The document rack unit 100 conveys the document rack 50 in the horizontal direction by using a stepping motor 102 as a power source. The document rack 50 is slidably held on a transport rail (not shown). It is conveyed using the conveyor belt 110. The document rack 50 includes a lower frame 52 on which a transparent glass is placed, on which a document is placed, and two left and right sides from the lower frame 52.
It is composed of an upper frame 55 which is supported by a gas spring 53 of the book and which is also fitted with transparent glass. The original to be copied is placed on the glass plate of the lower frame 52 with the upper frame 55 opened upward, and is ready for copying with the upper frame 55 closed.

An operation panel 60 (see FIG. 3) is arranged on the upper portion of the frame of the document stacking unit 100, and the operation panel is configured to instruct the copy magnification and the exposure operation start in the copy camera 20. ing. Note that the details thereof are omitted because they are not directly related to the gist of the present invention.

Next, the structure of the optical unit 200 will be briefly described. The optical unit 200 is for forming an optical image obtained from a document on a photosensitive material electrostatically attracted to a photosensitive material drum 310 provided in the drum unit 300. The optical system of the optical unit 200 is configured around an image forming lens 202, and has a first lamp unit 204 for a reflected light source and a second lamp unit 20 for a transmitted light source.
6, first, second, to guide the light from the document to the lens 202
It is composed of third mirrors 211, 212, 213 and fourth, fifth, sixth and seventh mirrors 214, 215, 216, 217 for guiding the light passing through the lens 202 to the sensitive material. Of these, the third, fourth and seventh mirrors 213, 21
4, 217 are fixed to the optical unit 200.
On the other hand, the first and second mirrors 211 and 212 are incorporated in the vertically movable object side moving mirror unit 220, and the fifth and sixth mirrors 215 and 216 are similarly moved in the vertically movable image side moving mirror unit 230. It has been incorporated.

The object-side moving mirror unit 220 and the image-side moving mirror unit 230 can be raised and lowered independently of each other, and depending on the raising / lowering position, the optical distance (object distance) X from the document to the lens 202 or the lens 202 can be changed. Optical distance (image distance) Y to the surface of the photosensitive material drum 310
Determine. Both distances X and Y are the focal length F of the lens 202.
On the other hand, if the relationship of 1 / F = 1 / X + 1 / Y (1) is satisfied, the optical image of the document is the photosensitive material drum 310.
An image is formed on the surface of, and the magnification at that time is Y / X. Therefore, if the object-side moving mirror unit 220 and the image-side moving mirror unit 230 are moved so as to satisfy the relationship of Expression (1) according to the designated magnification, the feeling of electrostatic attraction on the surface of the photosensitive material drum 310 is obtained. An image with a specified magnification can be obtained on the material. Control of the positions of the object-side moving mirror unit 220 and the image-side moving mirror unit 230 is performed by the electronic control unit 30 described later.

Since the copying camera 20 of the embodiment is of the slit exposure type, the optical magnification has meaning only in the width direction of the original. The magnification in the length direction of the document is 5
It is determined by the ratio of the transport speed of 0 and the peripheral speed of the photosensitive material drum 310. Therefore, the electronic control unit 30 sets both mirror units 220, 23 according to the magnification input from the operation panel.
After controlling the position of 0, at the time of exposure, the document rack 50
The speed ratio of the photosensitive material drum 310 is also controlled. In practice, the rotation speed of the photosensitive material drum 310 is constant and the document rack 5
The transport speed of 0 is variable.

Next, the drum unit 300 will be described. As shown schematically in FIG. 1, the drum unit 3
00 draws the sensitive material stored in the upper magazine A or the lower magazine B by the winding transport mechanism 320 and transports it to the photosensitive drum 310, and the photosensitive drum 310 adsorbs the sensitive material on the drum surface. The configuration of the drum unit 300 that fulfills such a function will be described below. The sensitive material is cut into a length designated by the operation panel by a cutting device 330 provided in the middle of the winding transport mechanism 320.

As shown in FIG. 3, the drum unit 300
Includes left and right side walls 301 and 302 for rotatably supporting the photosensitive material drum 310. Then, between the both side walls, the winding transport mechanism 320 and the cutting device 330 described above are provided.
In addition, a peeling device 350 for peeling the sensitive material from the surface of the sensitive material drum 310, a discharge transport mechanism 360 for transporting the sensitive material peeled from the sensitive material drum 310 to the collection box 305, and the like are provided. In addition, the motor 34 that rotates the photosensitive material drum 310
0, or a stepping motor (not shown) that is a drive source common to the winding transport mechanism 320 and the discharge transport mechanism 360,
The drum unit 300 is assembled and fixed to one of the side walls 301 and 302.

The photosensitive material drum 310 is made of a conductive light metal material such as an aluminum material, and is provided with a hollow drum body 311 and end shafts 312 and 313 at both ends thereof, the both end shafts being the center of the drum body 311. It is configured by fitting and fixing at both ends so as to match the axis. The drum body 311
A groove 31 into which a peeling claw (not shown) in the peeling device 350 for peeling the photosensitive material from the drum surface is inserted into the surface of the groove 31.
Four 4 are formed. Further, on the surface of the drum body 311, a coating film made of a dielectric material is provided so as not to leak even if an operator carelessly contacts the drum surface at the time of drum maintenance and inspection.

The photosensitive material drum 310 includes the left and right side walls 30.
Through bearings 315 held by 1, 302, they are rotatably supported between the left and right side walls 301, 302. At this time, the outer ring of the bearing 315 is fitted into the bearing receiver 316 made of an insulator fitted and fixed to the left and right side walls 301 and 302, and the outer end surface of the outer ring is fixed to the end plate 317 fixed to the bearing receiver 316. It is suppressed by.

A driven pulley 318 fixed to the end shaft 312 and a drive pulley 341 on the side of the motor 340.
The driving force of the motor 340 is transmitted through the steel belt 342 which is stretched between the photosensitive drum 310 and
The motor 340 rotates normally and reversely as the motor 340 rotates.

A drum applying device 400 for applying a DC voltage for charging an electrostatic charge to the photosensitive material drum 310 will be described below. The drum applying device 400 includes a high-voltage power supply unit 401 incorporated in the base body 40.
And an insulator piece 402 on the side surface 21 of the main body of the copying camera 20.
And a connection terminal 410 fixed via the connection terminal, and the high-voltage power supply unit 401 and the connection terminal 410 are connected to each other.

The high-voltage power supply unit 401 includes the photosensitive material drum 3
A high-voltage DC voltage is applied to the photosensitive material drum 310 so that the surface potential of the drum body 311 of No. 10 becomes a high potential (about 1 to 3 KV) at which a sensitive material such as a polyester base film can be electrostatically adsorbed to the surface of the drum body 311. It is for doing.
In this embodiment, the potential of the surface of the drum body 311 is −1.5K.
It is configured to apply a DC voltage such that the voltage becomes V. Then, by opening and closing a built-in switch (not shown) based on a control signal from the electronic control unit 30 described later,
As will be described later, the photosensitive material drum 3 is connected via the connection terminal 410.
A DC voltage is applied to the photosensitive material drum 310 by establishing conduction with the photosensitive material drum 10.

The connection terminal 410 connected to the high-voltage power supply unit 401 is formed by bending a phosphor bronze plate material having high conductivity, and has a tip portion 411, an inclined portion 412, and a mounting portion 413. Further, the tip portion 411 is provided with a contact protrusion 414. When the connection terminal 410 is in a free state, it has a shape shown by a chain double-dashed line in the figure,
The tip portion 411 has a property as a so-called leaf spring so that when the tip portion 411 is pushed toward the mounting portion 413, the tip portion 411 has a shape shown by a solid line in the drawing. In other words, due to the nature of this leaf spring, the connection terminal 410 always urges the contact protrusion 414 forward.

In assembling the connecting terminal 410, the notch 22 formed in the side surface 21 of the main body to the tip 4
The main body side surface 21 with 11 facing the photosensitive material drum 310 side
It is fixed to. Therefore, as described above, the connection terminal 410
When the photosensitive material drum 310 is assembled as shown in the drawing, the end surface of the end shaft 312 of the photosensitive material drum 310 and the tip of the contact protrusion 414 of the connection terminal 410 make point contact. In this case, the connection terminal 410 is adjusted and fixed in position so that the tip of the contact protrusion 414 makes point contact with the center of the end surface of the end shaft 312. Then, due to the property of the connection terminal 410 as the leaf spring, the contact protrusion 414 is urged toward the end surface of the end shaft 312 and pressed against the end surface to make point contact.

When the end surface of the end shaft 312 of the photosensitive material drum 310 and the tip of the contact protrusion 414 of the connection terminal 410 make point contact with each other in this manner, conduction between the high-voltage power supply unit 401 and the photosensitive material drum 310 is achieved through the connection terminal 410. To be Then, when the switch of the high-voltage power supply unit 401 is closed based on the control signal from the electronic control unit 30, a DC voltage is applied to the photosensitive material drum 310, so the photosensitive material drum 31.
The high potential electrostatic charge described above is charged on the surface of the drum body 311 of 0.

Therefore, the photosensitive material 310 conveyed to the photosensitive material drum 310 by the winding transport mechanism 320 is electrostatically attracted to the photosensitive material drum 310, and the photosensitive material is the photosensitive material drum 310.
Is adsorbed on the surface of the drum body 311. To describe this state in more detail, since the photosensitive material drum 310 is rotated at a rotation speed corresponding to the conveying speed of the photosensitive material, the photosensitive material is moved from its tip (conveying tip) to the photosensitive material drum by the electrostatic attraction. 31
No. 0 drum body 311 is sequentially attracted to the surface of the photosensitive material drum 3
It is set on the outer circumference of 10. When the photosensitive material is adsorbed, the photosensitive material drum 310 rotates counterclockwise in FIG.
When the suction is completed, the photosensitive material is rotated and stopped until the tip of the photosensitive material is positioned immediately before the exposure position. Thus, the preparation for copying on the drum unit 300 side is completed.

At the time of exposure, the document rack 50 is first conveyed below the optical unit 200 and moved to the initial position. While the document rack 50 is being conveyed, the object-side moving mirror unit 220 and the image-side moving mirror unit 230 are
Move to a position that achieves a predetermined magnification. From this state,
Rotate the photosensitive material drum 310 clockwise at a constant speed in FIG.
At the same time, the original rack 50 is conveyed at a speed determined based on the set magnification. It should be noted that the initial positions of the photosensitive material drum 310 and the document rack 50 require a predetermined time until the rotation speed and the transport speed become constant at the start of the rotation of the photosensitive material drum 310 and the start of the transportation of the document rack 50. Therefore, it is considered to be a position with an allowance for this time.

The tip of the exposed photosensitive material is the photosensitive material drum 310.
When the peeling device 350 is rotated by the rotation of the drum body 311
The exposed photosensitive material is separated from the photosensitive material drum 310 by the separation claws that enter the groove 314 on the surface. After that, it is transported to the collection box 305 by the discharging transport mechanism 360. In the present embodiment, the photosensitive material is collected in the collecting box 305 and is developed by the developing device installed elsewhere. An automatic developing device is connected to the drum unit 300 of the copying camera 20,
There is no problem with the configuration in which the development is performed integrally.

Each of these units of the copying camera 20 of the embodiment described above is managed by the electronic control unit 30. As shown in FIG. 3, the electronic control unit 30 includes a well-known CPU 31 that executes a logical operation, a ROM 32 that stores programs and data in advance, a RAM 33 that temporarily stores data and the like, a clock that generates an operation clock of the CPU 31, and the like. It includes a circuit 34 and the like, and further includes an input / output port 35 for interfacing with the outside world, a stepping motor controller 36, and the like. Each of these circuits
They are mutually connected via a bus 30A.

The input / output port 35 has various external sensor groups 37 in addition to the first and second lamp units 204 and 206.
And a circuit that controls the interface with the high-voltage power supply unit 401. An open / close signal of a switch incorporated in the high-voltage power supply unit 401 is output to the high-voltage power supply unit 401. Then, the high-voltage power supply unit 401 that has received this open / close signal
Opens and closes the switch based on the signal, and applies a high-voltage DC voltage to the photosensitive material drum 310 via the connection terminal 410.

The CPU 31 reads the state of each part of the copy camera 20 through the input / output port 35, and
Control the lighting and extinguishing of the lamp unit as necessary. The stepping motor controller 36 controls various motors via the stepping motor drivers 38 and 39. To the stepping motor driver 38, the drive motor 252 of the object side moving mirror unit 220 and the drive motor 256 of the image side moving mirror unit 230 are connected. Further, the stepping motor driver 39 is connected with a stepping motor 102 for transporting the document rack 50, a drum driving motor 340, a driving motor 370 for each part of the drum unit 300 such as a winding transport mechanism 320, and the like. Therefore, the CPU 31 can freely start, operate, and stop the motors of the respective parts via the stepping motor controller 36.

Next, of the processes executed by the electronic control unit 30, an outline of the exposure process will be described as a process related to the present invention. Normally, the electronic control unit 30 is shown in FIG.
The exposure processing routine shown in is executed. In this routine, first, the key input from the operation panel 60 is read (step S400), and various settings corresponding to the key input are performed (step S410). The various settings include, for example, selection of the upper magazine A or the lower magazine B, selection of a light source, setting of magnification, setting of document length, and the like.

After the various settings have been made, if the start key on the operation panel is pressed (step S42)
0), the process proceeds to S430, and the exposure process is performed by controlling the operation of each unit described above. That is, in this exposure process, the document rack 50 is conveyed, the sensitive material is wound by electrostatic attraction through the output of the switch-on signal (DC voltage application start signal) to the high-voltage power supply unit 401, and the lamp unit 2 is used.
Lighting of 04 or 206, execution of exposure (synchronous drive of the document rack 50 and the photosensitive material drum 310), etc. If the start key has not been pressed, the process returns to step S400 and the above-described processing is repeated from the key input from the operation panel.

As described above, in the drum applying device 400 of this embodiment, the high-voltage power supply unit 401 and the photosensitive material drum 310 are electrically connected via the connection terminal 410, and the photosensitive material drum 310 is charged with electrostatic charge. High voltage DC voltage is applied. At this time, in contacting the connection terminal 410 with the central axis of the end shaft 312 of the photosensitive material drum 310, the contact projection 414 of the connection terminal 410 is biased toward the end surface of the end shaft 312, and the tip of the contact projection 414 is urged. Is in point contact with the center of the end surface of the end shaft 312.

Therefore, regardless of the eccentricity of the photosensitive material drum 310 and the presence or absence of deviation along the central axis, the contact state between the end surface 312 of the photosensitive material drum 310 and the connection terminal 410 is almost the same as the initial state at the time of assembly. It can be maintained as it is, and the contact resistance can be set to a substantially uniform value. As a result, according to the drum applying device 400 of the present embodiment, it is possible to stably apply the DC voltage to the photosensitive material drum 310 without performing a complicated eccentricity adjustment of the photosensitive material drum 310, etc. 310
The electrostatic charge on the surface of the drum body 311 can be easily stabilized.

Further, the connection terminal 410 and the photosensitive material drum 310.
The point contact position with the end shaft 312 of is the end surface of the end shaft 312. Therefore, according to the drum applying device 400 of the present embodiment, the connection terminal 410 and the photosensitive material drum 310.
When attaching and detaching, the attaching and detaching operation is not limited, so that the attaching and detaching operation can be easily performed. Moreover, since the point contact position is the center of the end surface of the end shaft 312, the point contact position does not change on the end surface of the end shaft 312 even if the photosensitive drum 310 rotates. Therefore, by suppressing the wear of the contact protrusions 414, it is possible to avoid the fluctuation of the contact resistance between the connection terminal 410 and the end shaft 312, and to further stabilize the electrostatic charge on the surface of the drum body 311.

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment and can be implemented in various modes without departing from the scope of the present invention. Of course. For example, in the above-described embodiment, the contact protrusion 414 of the connection terminal 410 is configured to make point contact with the center of the end surface of the end shaft 312, but the point contact position is not limited to the center of the end surface as long as it is the end surface of the central shaft. Further, the drum applying device 400 of the present embodiment is used not only for the copying camera but also for other devices as long as the device uses the electrostatic drum that charges the electrostatic charge on the drum surface by the applied DC voltage. be able to.

[0042]

As described above in detail, in the electrostatic drum applying device of the present invention, when the conductive connecting terminal is brought into contact with the central axis of the electrostatic drum, the conductive connecting terminal is urged toward the end surface of the central axis. Then, make point contact with the end face of the central axis of the electrostatic drum. Therefore, regardless of the eccentricity of the electrostatic drum and the presence or absence of displacement along the center axis, the contact state between the end surface of the center axis and the conductive connection terminal is maintained in the almost initial state, and the contact resistance is set to a substantially uniform value. The DC voltage can be stably applied to the electrostatic drum. As a result, according to the electrostatic drum application device of the present invention, it is possible to easily stabilize the electrostatic charge on the surface of the electrostatic drum through stable application of the DC voltage without performing complicated eccentricity adjustment and the like. it can. Further, since the point contact position between the conductive connecting terminal and the central axis of the electrostatic drum is the central axis end surface, according to the electrostatic drum applying device of the present invention, the conductive connecting terminal and the electrostatic drum are attached and detached. Therefore, the attaching / detaching operation can be easily performed without being restricted by the attaching / detaching operation direction.

[Brief description of drawings]

FIG. 1 is a front view of a slit exposure type copying camera of an embodiment using an electrostatic drum applying device of the present invention and an explanatory view showing its configuration from the side.

FIG. 2 is an explanatory diagram illustrating a configuration of a drum applying device 400 according to an embodiment.

FIG. 3 is a block diagram showing a schematic configuration of an electronic control device 30.

FIG. 4 is a flowchart showing an exposure processing routine executed by the electronic control unit 30.

FIG. 5 is an explanatory diagram for explaining a conventional electrostatic drum applying device.

[Explanation of symbols]

 20 ... Slit exposure type copy camera (copy camera) 30 ... Electronic control unit 40 ... Base body 50 ... Document rack 100 ... Document rack unit 200 ... Optical unit 202 ... Lens 220 ... Object side moving mirror unit 230 ... Image side moving mirror unit 300 ... Drum unit 310 ... Sensitive material drum 311 ... Drum body 312, 313 ... End shaft 315 ... Bearing 316 ... Bearing receiver 320 ... Winding transport mechanism 330 ... Cutting device 340 ... Motor 342 ... Steel belt 350 ... Peeling device 360 ... Discharging transport mechanism 400 ... Drum applying device 401 ... High-voltage power supply unit 410 ... Connection terminal 411 ... Tip portion 412 ... Inclined portion 413 ... Mounting portion 414 ... Contact protrusion C ... Central axis D ... Electrostatic drum T ... Connection terminal

Claims (1)

[Claims] 1. An electrostatic drum, comprising a drum which rotates integrally with a central shaft rotatably supported, and which charges electrostatic charges on the surface of the drum by a DC voltage applied from the central shaft. An electrostatic drum applying device for applying a DC voltage of, by making point contact with the end face of the central axis of the electrostatic drum,
A conductive connection terminal for establishing electrical continuity between the charging DC voltage power supply and the electrostatic drum; and a biasing means for biasing the conductive connection terminal toward the end face of the central shaft. Electrostatic drum applying device.