JPS5831361A - Electrophotographic copying device with movable original platen - Google Patents

Abstract

PURPOSE:To prevent the slippage of an original, by providing a means which regulates the position in the side opposite to the original set regulation position of a platen cover when the platen cover is closed. CONSTITUTION:An approximately channel-shaped plastic spacer 15 is fitted into a supporting metallic jig for the purpose of preventing the lateral play of a hinge by which an original platen 1 and a platen cover 4 are attached to each other freely openably and closably. Though the spacer is effective when it is fitted between respective metallic jigs, the effect is secured also when the spacer 15 is provided only in the position of a maximum gap. Thus, since the hinge does not play for the impact which is caused when the original platen is stopped in the end in the direction of lateral movement, the position of the platen cover is regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic copying device that moves a document table to expose an original image onto a photoreceptor, develop it, and transfer it to create a copy. The purpose of this is to prevent the lateral displacement of the platen cover, which suppresses and regulates the original set in the original, and eliminates the original deviation.

Conventionally, in this type of electrophotographic copying apparatus in which the document table moves, as shown in FIG. 1, after setting the copy document 3 on the glass 2 of the document table 1, the platen cover 4 is closed and the document placed on the platen cover is removed. A valve plate 6 is used to press the original tightly against the glass surface. The platen cover 4 is attached to the document table 1 so that it can be opened and closed at two positions on the left and right sides using hinges 6. Figure 2 (a), ('b
), as shown in the side view and the side views 3, -1 and 1, the document table fixing bracket 7 and the platen cover fixing bracket 8 are rotatably connected by the supporting bracket 9, and the auxiliary brackets 1o and 11 are connected rotatably to each other. One end is rotatably locked to the support fitting 9, the other end is rotatably locked to the platen cover fixing fitting 8 and document table fixing fitting 7, respectively, and the auxiliary fitting 10 and the supporting fitting 9 are A spring 12 is provided between them to bias the platen cover in the direction of the arrow in FIG. 2 (&). Further, a spring 13 is provided on the auxiliary metal fitting 11 so as to form a triangle between the auxiliary metal fitting 11 and the document table fixing metal fitting 7, so that a tensile force is applied when the platen cover is opened. Note that the rotational fulcrum of each metal fitting is locked by a fulcrum pin 14, respectively.

In an electrophotographic copying device with such a configuration, when the platen cover is closed and copying is started, the document table moves left and right to perform copying and return operations, but since there are many pivot points for the hinge, the document table does not move. At the left and right ends of the movement, when the direction of movement is changed and stopped, the platen cover receives an impact and slides left and right. At this time, the original should be placed in the upper right corner (
The position is restricted to any position depending on the process (any position is possible), and since it is pressed by the document holder, there is no effect when the rightward movement is stopped. However, when the leftward movement is stopped, the document is not regulated in any way, and as the platen cover shifts to the left, it is pressed against the document holder, and since it is stuck in close contact with static electricity, it also shifts at the same time. Particularly in the case of copying a large number of sheets, since such operations are repeated, the deviation width increases and becomes larger. Therefore, the finished copy has the disadvantage that it is out of alignment with the original image, resulting in a reduction in copy quality.

The present invention aims to eliminate such drawbacks and prevent misalignment of original documents, and will be described in detail below with reference to the drawings. Note that the first
The same parts as those in FIG.

FIG. 3 shows an embodiment of the present invention, in which a substantially U-shaped plastic, resin, or , a spacer 16 made of rubber or the like is inserted therein. It is also effective to install it at a place where there will be a lot of stress. By doing so, the position of the platen cover can be regulated because the hinge does not rattle due to the impact when the document table is stopped at the end in the horizontal movement direction.

FIG. 4 shows another embodiment of the present invention, in which a portion is shown enlarged. A poly slider 16 in the form of a surface cam with a part of the circumference thickened is fixed to the support fitting 9 at the rotation fulcrum of the platen cover fixing fitting 8 and the support fitting 9, and the fulcrum pin of the platen cover fixing fitting 8 is fixed on the other side. The surface cam type polyslider 17 described above is fixed to 14, and the partially circumferentially thick portions of both polysliders 16 and 17 are made to face each other so as to match when both metal fittings are closed. In other words, when the two metal fittings are closed, the part of the circumferential thickness of both polysliders is rubbed together, and when they are completely closed, the thickest parts come into contact with each other to eliminate the gap between the metal fittings or prevent them from rattling. . When opening, follow the reverse of the above procedure, and there will be no resistance and it will rotate easily. Polysliders include metal, plastic,
It can be made of resin, rubber, etc. In this embodiment, only a part of the pivot points have been described, but if all the pivot points are provided, rattling of the hinge can be completely prevented and the position of the platen cover can be regulated.

FIG. 6 relates to another embodiment of the present invention, in which the platen cover 4
A convex member 18 for regulating the position of the platen cover 4 is provided on the document table 1 on the opposite side from the document setting regulating position when the document is closed.

As detailed above, according to the present invention, there is a structure that prevents rattling of the hinge that attaches the document table and the platen cover so that they can be opened and closed, or a convex member that simply restricts the position of the platen cover is provided on the document table. When a document is set on one side of the document table and the platen cover is closed to regulate the sect position of the document, at least the position of the platen cover on the opposite side of the document set regulation position is regulated. , it is possible to prevent the position of the platen cover from shifting even if it receives an impact when the document table is stopped at the end of the horizontal movement direction, and also to prevent the document from being misplaced07-1

[Brief explanation of the drawing]

Figure 1 is a perspective view of a moving document table type electrophotographic copying device;
Figures (&) and (b) are a side view and a front view of a conventional example of a hinge that attaches the document table and platen cover so that they can be opened and closed, and Figure 3 is a front view of a hinge according to an embodiment of the present invention. The figure is a side view of a polyslider for tightening the rotational fulcrum of a metal fitting constituting a hinge in another embodiment of the present invention, and FIG. 6 is a perspective view showing a position regulating means for a platen cover in another embodiment of the present invention. be. 1...Original table, 3...Original, 4...
...Platen cover, 6...Hinge, 8...
...Platen cover fixing metal fittings, 9...Supporting metal fittings, 16...Spacer, 16.17...
...Polyslider, 18...Convex member. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 114 Figure 5

Claims (1)

[Scope of Claims] (1) A movable document platen type electrophotographic copying device in which a platen cover is supported and fixed to a document table in a manner that it can be opened and closed; A movable document table type electronic photograph, characterized in that, in order to regulate the setting position of the document platen, a means is provided for regulating at least a position of the platen cover on the opposite side of the document setting regulation position when the platen cover is closed. Copying equipment. ? ) The document table movable electrophotographic copying apparatus as set forth in claim (1), characterized in that a substantially U-shaped spacer is provided on a support fitting constituting a hinge as a position regulating means. (3) In the statement of claim (1), as the position regulating means, a pair of surface cam-type poly sliders having a partially thick circumferential portion at the rotation fulcrum of the hinge are slid against each other. Features 2. A movable document table type electrophotographic copying device. (→ Claim (1) describes an electrophotographic copying apparatus with a movable document table, characterized in that a convex member for regulating the position of the platen cover is provided on the document table as a position regulating means.