JPS58193536A - Platen moving mechanism of electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To facilitate the inspecting operation and assembling operation of a copying machine, by providing a specifying means for moving an original within a specific range and a resetting means for it, and resetting the specifying means during operation except copying operation. CONSTITUTION:When a platen 9 starts scanning, a platen block 12 at its rear end 9a engages a shaft stopper 13 and when the scan ends, it engages a shaft stopper 13 at a front end 9b, specifying movement to beyond the specific range. When the inside of the copying machine, specially, an optical device 2 is inspected, a front cover 23 is opened to draw the shaft stopper 13 out as shown by an arrow (b) by gripping a handle part 20, and it is rotated counter-clockwise and locked; and then the shaft stopper 13 is disengaged from the platen block 12 to allow the platen 9 to move freely. For this purpose, the platen 9 is moved to expose the inside of the copying machine and the inspecting operation is carried out easily.

Description

[Detailed description of the invention] This invention relates to a platen moving mechanism of a secondary photocopying machine.

In document moving type electronic photography, the document is placed on a platen, and the document must be scanned by moving the platen through a drive system. Moving only 1a hani is done from K. An optical device for irradiation and storage is placed below the grating, and a photoreceptor is placed below it. The irradiation rung illuminates the original placed on the platen through the platen, and this irradiation light illuminates the original 1.
11, it becomes a light book, passes through the Yurin lens, and lands on the surface of the photoreceptor! *To be done. Further, the surface of the photoreceptor is charged by the charging device fit, and this charged area is tipped by the light gIK of the original to form an electrostatic charge myJ.

With the conventional platen movement mechanism, as mentioned above, foreign matter may get into the optical devices such as the irradiation lamp and storage lens under the platen, and the rung terminals and photoelectric parts may be exposed, causing spots between the entire surface of the platen. In order to prevent this, the range of movement of the platen is limited so as to prevent exposure of the optical device, the lamp terminal portion, and the charging portion even during scanning of the document. In other words, the platen is positioned at Klv so that both the optical device # and the rung terminal portion and the charging portion can be set to P#5 at both the scan start position and the scan end position.
Further movement in either the scanning direction or the opposite direction is prohibited. For this reason, usually! When inspecting the optical garrison station located under the latin, the platen obstructs the inspection from above, so the copying machine has to be pulled out from the main body and inspected. As described above, conventional methods have had the disadvantage that inspection work for optical devices and the like is difficult and complicated.

Another drawback was that when the optical system was returned to the 68 aircraft body after inspection work, the optical distance would be incorrect.

The present invention has been made in an attempt to eliminate such drawbacks in the prior art, and its purpose is to prevent foreign matter from getting into optical devices such as the irradiation rungs and imaging lenses when scanning documents, and to prevent the lamp terminals and charger from getting into the optical devices. By exposing the optical device gt# during inspection work and preventing In from being generated during safety reasons, the inspection work is performed from the top of the copying machine. The objective is to simplify the inspection work or assembly work of a copying machine.

In order to achieve this object, the present invention provides a platen moving mechanism of an original moving type electrophotographic copying machine, which includes a control means for controlling the movement of the platen so that the original is moved within a predetermined enclosure, and a vI period. A release means for releasing the platen is provided, which prevents the movement of the platen during copying operations so as not to expose the equipment inside the subject, and prevents the platen from moving forward during operations other than copying. '', the platen movement e side is provided as a sign that the intellectual control means has been released and the platen has been moved outside the above-mentioned predetermined range, making it possible to inspect the equipment inside the front camera. In the platen movement mechanism of the present invention, the platen is installed so that it can move to a position where the upper part of the optical device is exposed when the !laten movement restriction □ means is released by the release means. It is preferable that the optical device is snow-proofed at a position where it can be directly touched from the upper part of the copying rod main body.Furthermore, when the platen movement restriction means is released by the release means, one copying device is rendered electrically inoperable at the time of lWj. Ba,
Preferable from the point of view of safety. In addition, when the front cover of the copying machine is closed, the upper part of the KL and optics@tube is connected so that it is in a state where copying is possible, and when the front cover is open, it is electrically disconnected and copying is impossible. In an unmatched case, the copying machine may be configured so that the platen movement restricting means cannot be released unless the front cover is opened and the edge is electrically disconnected.

As described above, since the platen movement mechanism of the present invention is provided with the platen movement regulating means, the optical device, the rung terminal portion, and the charging portion are housed in the platen during document scanning, so that foreign matter does not enter the optical device ffK. In addition, the rung terminal portion and the live portion are not exposed, thereby preventing safety problems from occurring.

Furthermore, since a release means for releasing the above-mentioned restriction means is provided, during inspection work, this release means releases the platen movement restriction means, moves the platen to a place other than the alluvial scanning range, and inspects the optical device above the platen. It can be easily done from Further, since the adjustment or assembly of the optical device can be performed from the copying machine side, there is no need to pull out the optical device etc. outside the copying machine. Therefore, the inspection work or assembly work of the copying machine can be simplified.Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of an original moving type electrophotographic copying machine to which the present invention is applied, and reference numeral 11 1 is a photosensitive drum. An optical device 2 is arranged above the photosensitive drum l. The optical device 2 is composed of a focusing light transmission body 3 and an illumination rung 4. As the focusing optical transmission body 3,
For example, a gradient index lens called a SELFOC lens (product name: Th) is used. This lens 3 is held from both sides by lens holders 5.6,
The lens holder 5 is fixed to an inner cover 7 of the main body of the copying machine. A reflector plate 8 is arranged around the irradiation lamp 4, and the reflector plate 8 allows the light emitted from the irradiation lamp to concentrate on one point on the document. The end of this reflector is fixed to the inner cover 7. A platen 9 made of a transparent glass body is attached to the -F side of the inner cover 7 so as to be movable in the direction of the arrow. The original is placed on this platen 9 facing downward.

The platen 9 is supported on both sides by a support frame 10.11, as shown in FIG. 3, and this support frame 10 is further secured to a block 12. The block 12 is formed with a stepped portion 14 for engaging with the shaft stop horn 413. The block 12 is connected to a drive means (not shown) such as a motor via a drive force transmission means (not shown) such as a drive pulley, an idler pulley, and a wire.

Are there shaft horns at both ends of the upper part of the subject as shown in the third figure? 13 is arranged, and this shirt tostra/
#13 can be slid in the axial direction by bearings 15.16
and is rotatably mounted. The bearings 15,16 are fixed to the frame 17,18 of the copying machine body. The tip of shaft horn #13 is! latin block 120
It is an engaging part 19 that engages with the stepped part 12, and a handle part 20 is formed at the rear end. Shaft horn #1
A spring receiver 21 is fixed to a position # near the bearing 16 of No. 3, and a spring 22 is arranged between the spring 921 and the bearing 16, and the shaft stop horn #j
3 K Constantly applies force in the direction of the arrow. In the copying operation ready state (copying standby state or copy M), the shaft stopper 13 is in the WInC position as shown in the figure, and in this position the retaining part 19 engages with the step part 12 of the platen block to secure the platen. The movement of 9 people is now restricted. On the other hand, when inspecting the inside of the camera, especially the optical device 2, the shirt strainer/413 is attached to the spring 22.
It is moved in the direction of arrow C against the force of , and is rotated counterclockwise by approximately qO@ as shown by arrow C and locked.
(see dashed line). This locking mechanism includes, for example, a key-shaped protrusion provided in the axial direction of the shaft stop horn 113, and
This can be more easily achieved by providing a keyway on the inner surface of 6 that engages with this protrusion. When the shaft levers 13 are in this locked position, the engaging portions at their tips are disengaged from the stepped portions 12a of the platen block 12, and the restriction on movement of the platen is released.

Next, the operation of the platen moving mechanism incorporating the percentage feature of the present invention will be explained. Referring to Figure 1, the platen position at the start of document scanning! (indicated by a broken line) and the platen position fil (indicated by a solid line) at the end of document scanning. In the figure, the heights of the solid line position and the broken line position of the platen 9 are different, but this is to make the figure easier to read, and they are actually at the same height. At the start of scanning as shown by the broken line, the platen 9 has a rear end 9a fi
Platen block 1 located at l+ (right @ in Figure 1)
2, as shown in Figure 3, the shaft is straight! 13, and movement in the direction opposite to the direction indicated by the arrow is restricted. On the other hand, at the end of scanning as shown by the solid line, the shaft is engaged with the shaft stop horn 13 located at the front end 9b (at the left in Figure 1), and moves in the direction shown by the arrow. When the platen 9 is at the scan start position or at the scan start position as shown in the figure, the platen 9 is locked and placed next to the entire optical system !2, thus preventing the scanning. Even inside, optical device #2 does not come out.

Next, when inspecting the inside of the copying machine, especially the optical device f2, a service person or the like should first open the front cover of the copying machine as shown by the arrow, and open the handle part 20 of the shaft stock horn 413.
Grasp it, pull it out in the direction indicated by the arrow, and turn it counterclockwise to lock it in place. Then, shaft stock horn 413! The platen 9 is disengaged from the platen lock 12, and the platen 9 can move freely. Therefore, the platen 9 can be moved to the right or left in the figure, exposing the interior of the copying machine and making inspection work easier. In FIG. 2, the platen 9 indicated by a solid line is moved in the opposite direction to the scanning direction by disengaging the shaft stopper 13 on the right side of the figure, and the platen 9 indicated by a broken line is the one shown on the left side of the figure. . The shaft stopper 13 is disengaged and the platen is moved in the scanning direction. In either state, the upper part of the optical device 2 is not covered by the platen 9, so that inspection of the optical device 2 can be easily performed from above. Also, when performing inspection work, the flat part 20 of the shirt strap/4'13 cannot be pulled out in the direction of the arrow to release the platen movement restriction unless the front cover of the copier is opened. On the other hand, when performing copying work, the engaging portion 14 of the shaft stopper 13
The front cover 23 cannot be closed unless it is firmly pushed into the position where it engages with the stepped portion 14 of the platen block 120. A stopper mechanism (not shown) is also used to prevent the platen from falling off from the copying machine when the platen movement restriction is released and the platen is moved from side to side during inspection work.

As described above, according to the present invention, when the copying machine is in the state where it is ready to copy, t! There is a shaft stopper! The movement range is controlled by the Latin movement restricting means to prevent foreign matter from entering the optical device or the lamp terminal portion and charging portion from causing safety problems. Furthermore, when carrying out inspection work on a copying machine, the platen movement control means can be easily released by the release means and the platen can be moved, so equipment such as optical devices can be easily inspected from above the copying machine. This greatly simplifies inspection work. It is also advantageous that parts replacement and assembly work can sometimes be performed from above the copying machine.

In addition, as mentioned above, the front cover of the copying machine must be opened to prevent the platen movement restriction from being released, and conversely, the front cover cannot be closed unless the platen movement chain side means is in the platen restriction position. By doing so, malfunction of the platen can be prevented.

The first section of the Hiro drawing shows a part of a copying machine incorporating the platen moving mechanism of the present invention, and is a schematic diagram showing the state of the copying machine when scanning a document.

FIG. 1 is a schematic diagram showing the same state of the copying machine as in FIG. 1 during inspection work.

Figure 3 shows Figure 1 and 1.
FIG. 3 is a right side view showing the platen moving mechanism of the present invention placed in the apparatus.

l...Photoreceptor, 2...Optical device, 3
...lens, 4...irradiation lamp,
5.6...Lens holder, 9.
...Platen, 12...Graten block, 13...Shaft stock horn mother, 2
0...Handle part, 23...Front cover〇Figure 1 8, ○

Claims (1)

[Claims] A platen moving mechanism of a document moving type electrophotographic copying machine is provided with a control means for regulating the movement of the platen so that the document is moved within a predetermined range, and a release means for canceling the control means. During the copying operation, movement of the platen is restricted so that the equipment inside the copying machine is not exposed, and during operations other than the copying operation, the restriction means is released and the platen is moved outside the predetermined range, A platen moving mechanism that indicates that the equipment inside the copying machine can be inspected.