JPS5857147A - Fixing mechanism of plate for pressing original into contact - Google Patents

Abstract

PURPOSE:To fix a press-fixing plate surely to an original set table without play with no another member for coupling, by providing a fitting recess part in one of the press- fixing plate and the original set table and providing a fixing part, which should be fitted to this fitting recess part freely attachably and detachably, in the other. CONSTITUTION:A press-fixing plate 11 is placed on an original set table 1 so that a projecting stripe 18 of a projecting part 20 is fitted into a notch 12 and a positioning projection 21 is inserted into a wide hole 15 of engaging holes 17. When the press-fixing plate 11 is so shifted that an engaging piece 19 is engaged in a fitting recess part 13, the engaging piece 19 is deformed elastically, and the side edge of the fitting recess part 13 gets over the slope of the engaging piece 19; and when the engaging piece 19 coincides with the fitting recess part 13, the original press-fixing plate 11 is positioned in the longitudinal direction and the thickness direction in figure. At this time, since the positioning projection 21 is guided into a narrow hole 16 of engaging holes 17, the press-fixing plate 11 is positioned in the lateral direction simultaneously, and thus, the press-fixing plate 11 is fitted and fixed to the original set table 1 without play by the flexible elasticity of the engaging piece 19.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for fixing a pressure bonding plate to a document table in an image forming apparatus such as an electrophotographic copying device, for example, for bringing a document to be copied into close contact with a document placement surface of a copying machine. a It is related to paulownia.

Conventionally, the crimp plate and document table have two methods: the crimp plate has a hinge part for opening and closing the crimp plate, and the foot of this hinge is detachably fixed to the document table, or the hinge part is attached to the document table with screws. The majority of methods have been to fix the one-rotation shaft to the hinge so that it can be attached and detached, but with these methods, if the crimp plate is made easier to attach and detach, it creates a large play between the crimp plate and the document table. (
Become.

The crimping plate tends to move during copying, and there is a large risk that the document may move.This risk increases in electronic copying devices with a movable document table. If you try to restrict the movement of the plate, it becomes difficult to remove the crimp plate when copying a large original, resulting in troublesome work such as having to remove the hinge using a tool. This makes the mechanism difficult for users to use. In addition, the provision of the hinge member as mentioned above between the crimp plate and the document table increases the overall height of the wire, document table, and crimp plate, which is a major hindrance to the miniaturization of copying machines, which has been increasing in recent years. There were drawbacks such as. The present invention eliminates the drawbacks of the conventional example described above, makes it easier to attach and detach the document table and the pressure bonding plate, and also makes it possible to reliably fix the pressure bonding plate to the document table. It is an object of the present invention to provide a fixing device for a document pressure bonding plate that can be made thinner.

The present invention will be explained in detail below based on embodiments shown in the drawings. Reference numeral 1 denotes a document table having a transparent member such as a glass plate and its frame, and this document table 1 is attached to the upper surface of the main body 2 of the copying machine. Inside the copying machine main body 2, there is a light source 3 for exposure, a short focus imaging element array 5 for forming an image of the original on the document mounting table l on the photoreceptor drum 4, and a latent image on the photoreceptor drum 4. Developing device for visualization6. A transfer charger 9 for transferring the developed image on the photosensitive drum 4 onto the transfer paper 8 fed from the paper feeding system 7. and a separator 10 for fixing the unfixed image on the transfer paper B.

Reference numeral 11 denotes an original pressing plate superimposed on the upper surface of the original placing table 1, and the pressing plate 11 presses an original (not shown) onto the original placing table 1.

Further, one side of the pressure bonding plate 11 is attached to the original table 1 via a connecting mechanism so as to be openable and closable, and this connecting mechanism will be explained with reference to FIGS. 2 to 5. That is, at the edge of the document table 1, there is a retaining part 14 consisting of a notch 12 for fitting and a fitting recess 13 continuously formed on both sides of this notch 12, a wide hole 15, and this wide hole. 15
A retaining hole 17' consisting of a narrow hole 16 formed subsequently to
t-has. Further, the crimp plate 11 includes a protrusion 18 that is engaged in the notch fi12, and retaining pieces 19 that extend on both sides of the protrusion 18 and are engaged in the fitting recess 13. and the above-mentioned retaining hole 17.
It has a positioning protrusion 21 that is engaged with.

The above is the configuration of this embodiment.Next, I will explain its operation.When copying is performed using a copying machine with this configuration, the original table L first moves to the left M, and the light source for exposure 3
As the 0 light turns on, the original table is scanned to the right. At the same time, a latent image is formed on the photosensitive drum 4 through the entire short focus imaging element array.

Then, after scanning the original platen L or the original O, it is reversed.
It returns to the home position, which is the first state of the Nt, and stops. Although this copying operation is well known, next we will discuss the gist of the present invention, which is the connection between the document mounting table l and the pressure bonding plate 11. teeth.

For example, it is made of a material that can be elastically deformed, such as I-liprotherene. Therefore, in order to attach the pressure bonding plate 11 to the document placement table 1, the pressure bonding plate 11 is first positioned on the document placement table l, and then the protrusion 18 of the raised portion 20 is fitted into the notch 12. In addition, the positioning protrusion 21 is positioned so as to be inserted into the wide hole 15 of the retaining hole 17. Therefore, when the crimp plate 11 is shifted so that the retaining piece 19 is engaged in the fitting recess 13, the retaining piece 19 is elastically pressed and the slanted surface of the retaining piece 19 engages with the fitting recess. After crossing the edge of N513 and finally meeting the engagement piece 19 or the fitting opening @13, the document pressure bonding plate 11 is positioned in the longitudinal direction and the thickness direction in the drawing. Also at this time, 1 positioning protrusion 2
1 is guided into the narrow hole 16 of the engagement hole 17, the lateral positioning is also done at the same time, and the crimp plate 11 is guided into the narrow hole 16 of the engagement hole 17.
The flexible and elastic force of the engaging piece 19 allows it to be fitted and fixed onto the mounting table 1 without play. When removing the pressure bonding plate 11 from the document mounting table 1), the protruding portion 2 of the pressure bonding plate 11
By pressing the upper part of 0, the engagement piece 19 and the fitting recess 1 are removed.
3 is loosened, the pressure bonding plate 11i can be shifted and removed from the original table 1. Figures 6 and 7
The embodiment shown in the figure shows another embodiment of the present invention.
In the sixth cause, the two positioning protrusions 21 in the above embodiment are replaced with positioning protrusions 21', and the two retaining holes 17'lk and one positioning retaining hole 17' are replaced. be. In addition, the embodiment shown in FIG.
1', and a retaining portion 14 and a protrusion 20t are formed at the intermediate portion of both retaining holes 17' and the intermediate portion of both protrusions 21'. Therefore, these embodiments also have the same effects as those described in the first embodiment. - As described above, the present invention provides a document pressure bonding plate in which a fitting recess is provided on one of the pressure bonding plate and the document mounting table, and a fixing S is provided on the other side to be removably fitted into the fitting recess. Since it is a fixing mechanism, it is possible to securely fix the pressure bonding plate to the document table without any looseness without providing a separate member for coupling, and furthermore, the attachment and detachment of both members is easy.
It has the advantage that it can be easily performed with only one hand's pressing force without requiring the operator A.

Furthermore, the present invention applies to copying machines that are becoming increasingly smaller.

It also has the advantage of being able to produce a very thin document mounting table and pressure bonding plate.

[Brief explanation of drawings]

Figure M shows a fixing mechanism for a document pressure bonding plate according to the present invention, and Figure 1 is a schematic diagram of a nine-bag copying machine equipped with the fixing mechanism.
Channel 2 diagrams (a) and (b) are 1! of the crimp plate! Figures 3 (a) and (b) are a plan view of the original table and its side view, and Figure 4 is an enlarged view showing the relationship between the retaining hole and the positioning protrusion. Explanatory drawings, FIG. 5 is an enlarged perspective view showing the retaining portion and the protrusion, and FIGS. 6 (a) and (b) are views of the pressure bonding plate and document mounting table according to another embodiment of the present invention. FIGS. 7(a) and 7(a) are plan views of essential parts of a pressure bonding plate and a document mounting table showing further embodiments. 1... Original mounting table, 2... Copying machine main body. 3... Light source, 4... Photosensitive drum 5
...Short focus combined image element play. 6...Developer, 7...Paper feed system, 8...
Transfer paper, 9... Transfer charger, 10... Fixing device, 11... Original pressure bonding plate, 12... Notch, 13... Fitting recess, 14... Engagement@
, 15... wide hole, 16... narrow hole,
17...Engagement hole, 18...Protrusion,
19...Engagement piece. 20... Protrusion, 21... Positioning protrusion. 21'...Positioning protrusion. Moon) Figure 3 (A) Liu) Figure 2 (B) Figure 3 (0) Figure 4 Hanging Figure 5

Claims (1)

[Scope of Claims] 1. In a mechanism for fixing the original pressure bonding plate to the document mounting table, a fitting portion provided on either one of the document pressure bonding plate or the document placement table, and a fitting portion provided on the other side and the fitting portion provided on the other side. a fixing means consisting of a protrusion that is removably engaged with the part by utilizing elastic deformation, a retaining hole provided in either one of the document pressure bonding plate and the document mounting table, and a retaining hole provided in the other to retain the same. A document pressure bonding plate comprising a positioning means comprising a positioning protrusion that is engaged with a matching hole, and provided so that the fixing direction of the fixing means and the positioning direction of the positioning means are approximately perpendicular to each other. fixation device. 2. The fixing device for a document pressure bonding plate according to claim 1, wherein the engagement hole and the positioning protrusion serve as insertion guide means when the document pressure bonding plate and the document mounting table are attached.