JPH0237587B2 - FUKUSHASOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus whose main body can be divided and opened into a first main body and a second main body. More specifically, the present invention relates to a copying apparatus that prevents a document table, which is reciprocatably provided in the main body of the apparatus, from hitting the floor or the paper feed/discharge tray when the main body is opened.

Hereinafter, the present invention will be explained by taking as an example a small-sized copying machine with a movable document table whose main body can be divided and opened with one end being the center of opening and closing.

Conventionally, in small electronic copying machines, a method for handling jammed transfer paper is to divide the copying machine into two separable upper and lower parts, and when jamming, use one end as a hinge to open one main body upwards. , methods have been developed to facilitate jamming. However, when the copying machine main body is opened, the upper body including the document table tilts, causing the document table to move rapidly toward the hinge side, causing damage to the document table drive unit and document table itself, or The original set in the original may be misaligned. To solve this problem, we have developed a safety device (Japanese Unexamined Patent Application Publication No. 153949/1982) that allows the main body to be opened only when the document table has been moved toward the hinge side, and a mechanism that works in conjunction with the opening means.
A document table fixing device has been proposed that fixes the document table when the main body is opened. However, as copying machines become more compact and the height of the copying machine main body becomes lower, when the main body is opened with the original platen protruding from the main body toward the hinge part, for example, the original platen bumps into the paper feed/eject tray. There is a risk that the tray may be damaged by hitting the document tray, or the document table itself may be damaged by hitting the floor.

Therefore, a movement blocking device has been proposed that prevents the document table from moving toward the hinge portion from the position where the document table is located except when the document table is being driven. However, this alone was insufficient as a safety device because if the power was turned off while the document table was close to the hinge section, the main body could be opened up and down.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to have a simpler configuration than the conventional device and to be able to eliminate the above-mentioned problems of the conventional device.

In order to solve the above problem, the present invention provides a first main body, a second main body provided in a manner that can be opened and closed at one end of the first main body, and a document movably provided in the second main body. and a copying apparatus in which the document table protrudes from a second main body in the movement direction when the document table reciprocates within a predetermined range to perform a copying operation, with the first and second main bodies in a closed state. a locking means for locking, and a blocking means for preventing the document table from moving toward the opening/closing center on the open side from the movement end position of the document table on the opening/closing center side of the first and second main bodies; When the document table is prevented from moving by the blocking means, the locking by the locking means is released and the second body can be opened, and the document table protrudes from the second body on the opening/closing center side at the end of the movement. When the second body is in the position, the locking means prevents the second body from opening.

Next, an embodiment of a copying machine according to the present invention will be described.

1 and 2 show cross-sectional views of the main body of the copying machine. In the figure, reference numeral 1 denotes a document placement table made of a transparent member, and this document placement table protrudes from the main body of the apparatus in the movement direction and reciprocates within a predetermined range. Reference numeral 2 denotes a short focal length small diameter imaging element array, and an original image placed on an original placing table 1 is slit-exposed onto a photosensitive drum 3. A charger 4 charges the photosensitive drum 3 uniformly. This uniformly charged photosensitive drum 3
Image exposure is performed by the element array 2 to form an electrostatic image. This electrostatic image is then visualized by the developing device 5. On the other hand, the transfer paper P is fed onto the drum 3 by a paper feed roller 6 and a registration roller 7 that rotates at a timing that registers the image on the photosensitive drum 3, and then transferred to a transfer charger 8. Then, the toner image on the photosensitive drum 3 is transferred onto the transfer paper P. Thereafter, the transfer paper P separated from the drum 3 is guided to a fixing device 10 by a guide 9, and after the toner image on the transfer paper is fixed, it is discharged onto a tray 12 by a paper discharge roller 11.

Now, in this embodiment, the main body of the copying machine is the upper main body 25.
and the lower body 26 can be divided and opened, and the upper body 2
5 is supported so as to be openable and closable around a lower body 26 and a shaft 13 provided at one end of the body, and is rotated clockwise (in the direction of arrow A) by a biasing means 29 such as a coil spring. force is applied.

Here, reference numeral 14 denotes a first hook which is a part of the locking means, and is provided on the upper body 25.
The biasing means 2 is fitted into the hole 15a of the side plate 15 of No.
The upper and lower bodies 25 and 26 are kept closed against the pushing force of 9. FIG. 2 shows a state in which the first hook 14 is removed from the hole 15a of the side plate 15 of the lower body 26 and the upper body 25 is pushed up and opened. In this state, if the original platen 1 protrudes to the right side of the copying machine, the paper feed tray 1
There is a risk that it will collide with 6 and be damaged, or even hit the floor. Therefore, in this embodiment, a document platen blocking device 27 as shown in FIG. 3 is provided. Figure 3 is a rear view of the copying machine;
Reference numeral 17 denotes a lever that forms part of the document table movement prevention device 27, and the document table 1 shown in FIG.
The platen 1 is located at a locking position, and engages with a stepped portion 1a provided on the document table 1 to prevent the document table 1 from moving beyond a certain position in the direction of arrow B. This lever 17 is operated by a plunger 27c when the document table is driven.
In other words, it is pulled downward from the document table 1, and does not affect the reciprocating movement of the document table 1. Note that this document platen movement prevention device 27
A slidable lever 17 is provided inside a,
An upward elastic force is applied to this lever 17 by a spring 27b, so that when the document table is not driven, the lever 1
7 engages with the stepped portion 1a of the document table 1, and the upper main body 2
This prevents the document from slipping off the document table 1 despite the opening of the document plate 5. Also, lever 17 when driving the document platen.
For example, when the copy signal is NO, the actuator 27
Spring 27b is pulled by plunger 27c that pulls d.
It is pulled downward against the elastic force of the document table 1, and does not interfere with the movement of the document table 1. Furthermore, plunger 2
7c is rffed by, for example, a copy end signal, so that the lever 17 then engages the stepped portion 1a by the spring force of the spring 27b, thereby preventing the document table 1 from inadvertently moving.

Next, detailed views of the hook portion, which is the main body opening mechanism of this embodiment, are shown using FIGS. 4 to 7.

In the figure, the first hook 14 is attached to the upper body 25.
It is integrally and rotatably fixed to a shaft 18 which is rotatably supported by a shaft 18, and is constantly pulled in the direction of arrow C by a spring 19. Also 2
Reference numeral 0 designates an opening handle for opening the main body, which is fixed on the shaft 18 so as to rotate together with the shaft 18. 21 is a second hook which is a part of the locking means for preventing the main body from being opened inadvertently when the document table 1 is not in a predetermined position; It is mounted so that it can rotate independently. The spring 22 is for urging the second hook 21 in the direction of arrow D, and is tensioned between the pin 14a fixed to the first hook and the pin 21b fixed to the second hook. The second hook 2
1 remains stationary with the pin 21a provided on the hook 21 abutting against the hook 14 due to the tensile force of the spring 22 (FIG. 4).

Next, referring to FIG. 5, the operation when the main body is released when the document table 1 is in a predetermined position will be described.

When the operator rotates the handle 20 in the direction of arrow D, the hook 14 rotates together with the handle 20 via the shaft 18, so that the hook 14b of the hook 14 fits into the opening 15a of the side plate 15 of the lower main body 26. The alignment is off. At this time, the hook 21 attempts to rotate together with the hook 14 in the direction of arrow D due to the action of the spring 22.
C protrudes from a hole 23 provided in the main body of the copying machine and abuts against the document table 1, thereby preventing further rotation. Therefore, as shown in FIG.
are detached from the side plate 15, and the upper body 2
5 can be pushed open upwards.

Next, when the original platen 1 is not in the predetermined position,
This shows the operation when the main body is released.

If the document table 1 is not in the predetermined position, that is, if the document table 1 is at the end of the movement protruding from the upper body 25 on the opening/closing center side of the upper and lower bodies, and is not in the position where it closes the hole 23, as shown in FIG. When the handle 20 is rotated in the direction of arrow D as shown in FIG. Due to the tensile force of the spring 22, the pin 21a rotates in the direction D while being in contact with the hook 14, and this time the hook 21d of the hook 21 is attached to the lower body 2.
The opening 15a of the side plate 15 of
The hook 21 prevents the upper body 26 from being opened upward. At this time, the second hook 21
Adjust the installation angle of the first hook 14 to the side plate 1.
5, the second hook 21 is fitted into the opening 15a of the side plate 15.

Further, FIG. 7 is a side view of the hook portion viewed from the direction of arrow E, and 15a indicates openings into which the hooks 14 and 21 fit, respectively. This opening 15a
is provided vertically on the side plate 15 of the lower main body 26, and the upper opening 15b connects the hook 14 and the lower opening 1.
It is fitted with the hook 21 at 5c.

Note that in this embodiment, since the hook portion is provided near the open end of the main body, although the document table 1 closes the hole 23, the document table movement prevention device 27
Even if the main body is opened when the lever 17 of the lever 17 is not engaged with the step 1a, the document table 1 will inevitably slide down to the position where the lever 17 and the step 1a engage and will be prevented from moving. 1 will not protrude to the left side of the main body and be damaged. Moreover, at this time, since the lever 17 of the movement prevention device 27 is applying a pressing force to the document table 1 by the spring 27b, the document table 1 gradually slides down. Furthermore, by providing the hook portion at such a position, the pushing force of the biasing means 29 is reduced, and the vertical positioning when the upper and lower bodies are engaged can be made more secure.

Further, in the above embodiment, the hook 14 and the hook 21 are provided coaxially, but the hook 21 may be rotatably attached to a separate shaft provided on the upper body. It may move back and forth. Furthermore, although this embodiment has been described as an example in which the present invention is used in a small-sized copying machine, the present invention is not limited thereto, and can of course be applied to, for example, a large-sized copying machine.

As described above, according to the present invention, when the document table is jammed or the like and stops at the end of movement position protruding from the upper body on the opening/closing center side of the apparatus body, an inadvertent attempt to open the upper body is prevented. Since release of the lock by any means is prohibited, opening of the upper body is prohibited. Therefore, the document table protruding from the upper main body does not collide with the floor or the paper feed/discharge tray, and it is possible to prevent damage to the paper feed/discharge tray and deterioration of the precision of the document table. Furthermore, since the device itself can be made smaller, it is particularly effective when used in a small copying machine, for example.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a copying machine body to which an embodiment of the present invention is applied, FIG. 2 is a cross-sectional view showing the copying machine body opened vertically, FIG. 4 to 7 are detailed views of the hook portion.
In the figure, 1 is an original platen, 3 is a photosensitive drum, 13
is a hinge, 14 is a first hook, 15 is a side plate of the lower main body, 16a is an opening, 16 is a paper feed tray, 18
20 is a handle, 21 is a second hook, 25 is an upper body, and 26 is a lower body.

Claims (1)

[Scope of Claims] 1. A first main body, a second main body provided so as to be openable and closable with one end of the first main body being the center of opening and closing, and a document table movably provided on the second main body; In a copying apparatus in which the document table protrudes from the second body in the movement direction when the document table reciprocates within a predetermined range and performs a copying operation, the first and second bodies are locked in a closed state. a locking means, and a blocking means for preventing the document table from moving toward the opening/closing center on the open side from the movement end position of the document table on the opening/closing center side of the first and second main bodies; When the movement is prevented by the blocking means, the locking by the locking means is released and the second main body can be opened, and the document table is at the end of movement position protruding from the second main body on the opening/closing center side. A copying apparatus characterized in that when the second main body is opened, the locking means prohibits opening of the second main body.