JPS6240442A - Scan exposure type copying device - Google Patents

Abstract

PURPOSE:To obtain a copied picture with high quality free from unevenness of density, blotted developing or layered irregularity by providing a flywheel that transmits driving force to at least a part of a carrying device and to a scanning device for exposure, and thereby eliminating vibration and irregularity of rotation. CONSTITUTION:To rotate a sheet carrying system at all times, a driving roller 5 is fixed to a shaft 3 together with a toothed pulley 4 and directly connected by a coupling to a motor 2 having a reduction gear attached to the wall of the body. Turning force of the motor 2 is transmitted to a toothed pulley 7 that acts as a flywheel through a toothed belt 6. A driving pulley 19 of a running wire 21 of a scanning exposure stand 24 is fixed to the toothed pulley 7 and fitted to a shaft 18 fixed to the output hub of an electromagnetic clutch 16. As the toothed pulley 17 that acts as a flywheel absorbs irregularity of rotation and vibration, the movement of the scanning exposure stand is smooth, and uniform speed running synchronized with carried photosensitive material sheet can be maintained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a conveyance system and a scanning exposure system for preventing column unevenness and blurring and improving image quality in a scanning exposure type copying apparatus using a photosensitive material as recording paper. The present invention relates to an improvement of a drive device.

[Conventional technology]

Conventional scanning exposure copying devices illuminate the document surface in a straight line,
A light source is run perpendicular to the straight line, and an image formed through an optical system is formed on a photoreceptor that runs in synchronization with the light source, and while it is being developed with toner, the toner image is The image is transferred onto recording paper that runs in synchronization with the photoreceptor,
This is to obtain a duplicate image. In such a copying machine, vibrations and uneven running speed occur (・However, if the size of the vibration is smaller than the size of the toner particles, it will have no effect on the image quality of the copied image, such as image unevenness or density unevenness. It was not large, and there was no need to take particular measures to prevent vibrations or speed unevenness.However, it was used instead of an electrophotographic copying device that transferred the photoreceptor and its toner-developed image onto recording paper to obtain a copied image. Without using a photoconductor, toner development, or recording paper, a scanning exposure image is directly formed on the surface of a photosensitive material (particularly a silver halide photosensitive material) running in synchronization with a scanning light source, and then processed into a photochemical processing device. In a scanning exposure type copying apparatus that completes a copied image through a photosensitive material, the sensitivity of the photosensitive material is high (furthermore, the size of the silver salt particles is incomparably smaller than that of toner particles, and therefore high resolution is achieved). This makes it easy for vibrations and small synchronization deviations between the travel of the light source and the travel of the photosensitive material to affect density unevenness and image shift in the copied image.

[Problem that the invention seeks to solve]

Since the present invention has the above-mentioned problems,... In order to obtain high-quality copied images even in scanning exposure type copying apparatuses using Rogge/silver oxide photosensitive materials, scanning exposure speed with less vibration and photosensitive material conveyance are required. It is an object of the present invention to provide a copying apparatus that has a high degree of synchronization with speed.

[Means for solving problems]

This problem is solved by the following technical means.

In a scanning exposure type copying apparatus in which an exposure scanning means and at least a part of a photosensitive material conveyance means are driven by a common drive source, a driving force is transmitted to at least a part of the said conveyance means and an exposure scanning means. A scanning exposure copying device characterized by having a flywheel in its drive system.

[Examples and effects]

Embodiments of the invention will be described with reference to the accompanying perspective views.

The top of the photosensitive material is a drive roller 5 and a pressure roller 10.
The sheet is sandwiched between a conveying roller 9 and a pressure roller 11, which are driven in conjunction with the driving roller 5 at the same speed, and conveyed in the direction of arrow A. The roller is constantly rotating when the switch is ON and in a steady state, and when the leading edge E of the photosensitive material sheet 28 is held between the rollers 9.11, it is detected by a detector placed near the exit of the roller, and the detection signal is output. The scanning exposure table 24, which travels while irradiating the document surface, and the reflecting mirror table (not shown) start traveling, and the light is passed through the optical system to the exposure aperture 30 provided between the rollers 5 and 9. Then, exposure of the photosensitive material sheet 28 is started.

The scanning exposure table 24 synchronizes with the transport speed of the sheet 28
The sheet travels, and the forward scanning exposure table at which the sheet passes between the exposure ports also stops traveling.

In order to constantly rotate the sheet conveying system, the drive roller 5 is fixed to the shaft 3 together with a toothed gooey 4, and is directly connected to a motor 2 with a speed reducer attached to the main body wall 1 through a coupling. The rotational power of the motor 2 is transmitted to a toothed pulley 4 directly connected to the motor via a toothed belt 6 to a toothed pulley 7 which also serves as a flywheel. The toothed pulley 7
is the drive pulley 1 of the running wire 21 of the scanning exposure table 24.
9 is fixed and is fitted via a bearing to a shaft 18 fixed to an output cup of the electromagnetic clutch 16, and the toothed pulley 7 is further fixed to an input cup of the electromagnetic clutch 160. The electromagnetic clutch 16 is fixed to the main body 1 with screws 32.

Further, a sub-frame 26 is provided parallel to the main body wall 1, and is fixed to the main body 1 by several stays 27.

The bracket 1 is attached to this subframe 26 via a bearing.
7 is attached, the shaft 18 is fitted, and the electromagnetic clutch is supported on both sides together with the output hub of the electromagnetic clutch. Further, a guide rail n is attached to this subframe 26,
A guide roller 5 attached to the end of the scanning exposure table U
is fitted so that it can run in a straight line.

Also, on the subframe, there is a pressure roller 1 of the sheet conveying device.
A pin 15 is attached to the swinging fulcrum shaft 13 of the lever 12 attached to the fixed axes IQa and lla of 0.11, and the spring 14 hooked to the hook at one end of the lever 12 is attached to the hook at the other end. . The pressure roller 10.11 is always pressed against the roller 5.9 by means of the spring 14. Further, the pressure roller 1O111 is fitted onto the shaft 1 (1a, 11a) via a bearing.

Note that the main body wall 1 and the subframe are on both sides, and the bearings of each roller, guide rail, swing lever, etc. are set so that the scanning exposure table and the conveyance device are supported on both sides, but this perspective view is In order to make it easier to see, only one side is shown.

The rollers 5.9, which are directly connected to the motor 2 with a speed reducer and are connected to each other and constantly driven at a constant speed, rotate smoothly because they drive the light-loaded photosensitive material sheet 4. Also, a toothed pulley 7, which also serves as a flywheel, is constantly driven via the toothed pulley 4 and the toothed belt 6, and when the toothed pulley 7 receives a signal to start running the scanning exposure table 240, the electromagnetic clutch 16 is activated. When turned on, the generated magnetic flux connects the rotor connected to the input side (drive side) and the output side (driven side).
The armature connected to the knob is frictionally connected and the wire drive pulley 19 immediately begins to rotate. The scanning exposure table includes an exposure lamp, its curved reflector, and a first
It is equipped with a reflector, and together with its frame, it is heavy and has a large load compared to conveying a sheet of photosensitive material, and the wire-driven goo 9190 rotations are susceptible to uneven rotation. . However, the toothed pulley 7, which also serves as a flywheel, absorbs such uneven rotation and vibrations, so the scanning exposure table can move smoothly.
It becomes possible to maintain constant speed travel in synchronization with the photosensitive material sheet being conveyed.

This is particularly effective when aiming to speed up copying.

Note that there is some margin between the end of the travel of the scanning exposure table 24 and the end of exposure of the actual document surface, so even if there is an asynchronous part at the end of the travel, it will not cause any practical problems.

However, if it is necessary to further tighten this, the problem can be solved by connecting an electromagnetic pulley to the electromagnetic clutch 16 to prevent a forced stop.

Furthermore, the lighter the scanning exposure table 240 is, the smaller the weight and diameter of the flywheel can be.

〔Effect of the invention〕

According to the present invention, the scanning exposure speed and the transport speed of the photosensitive material sheet can be accurately synchronized, vibration and rotational unevenness are eliminated, and high-quality copied images can be obtained without density unevenness, bleeding, development, or column unevenness. Scanning exposure type copying devices are now available.

[Brief explanation of drawings]

The accompanying figure is a perspective view of one embodiment of the invention. 1... Main body wall 2... Motor with reducer 3.8... Conveying roller shaft 4... Toothed pulley 5.9... Conveying roller 6... Toothed belt 7... Fly Toothed pulley that also serves as a wheel10.11
... Pressure rollers 10a, lla ... Pressure roller shaft 12 ... Lever 13 ... Swinging fulcrum shaft 14 ... Spring 15 - Spring hook is pin 16 ... Electromagnetic clutch, chi 18.21 ... Shafts 19, 20...Wire drive pulley 2]...Wire n...Guide rail 24...Scanning exposure table 5...Guide roller 26...Sub frame 27...Stay 4...Photosensitive Material sheet 30...Exposure port 33...Detector

Claims (1)

[Claims] In a scanning exposure type copying apparatus in which the exposure scanning means and at least a part of the photosensitive material conveying means are driven by a common drive source, driving force is transmitted to at least a part of the conveying means and the exposure scanning means. A scanning exposure type copying apparatus characterized in that a flywheel is provided in a drive system.