JPS60114854A - Press-contacting device of original - Google Patents

Abstract

PURPOSE:To move a pressing part in accordance with the thickness of an original and to press the original uniformly by fitting a fitting part pivotally to the body of the titled device so that the turning center of the pressing part is moved upwards from an original setting board. CONSTITUTION:The fitting part 21b is positioned on the original setting plate 23 by the engagement of a projection 21b' with a hole part 23a and held on a prescribed position by the force exerted by an elastic member 33 in the A direction so as not to be separated from the fixed position. When a thick original is set on the original setting board 22, the fitting part 21b resists the force of the elastic member 33 and rotates around the projection 21b' in the clockwise direction and a groove part 21c is moved upwards from the original setting plate 23. Since the fitting part part 21b is not fixed on the original setting plate 23 and elastically positioned by the positioning means 21b and the elastic member 33 holding the fitting part on the prescribed position, the fitting part 21b is made rotatable and the groove part 21c is moved upwards to set up the thick original 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document pressing device used in image forming equipment such as copying machines, stamping machines, and information recording devices.

Hereinafter, a description will be given using a document pressing device of a copying machine as an example.

In copying machines, a document pressure device is used to fix the document on the document table during copying and to prevent light leakage from the exposure lamp. Therefore, as shown in FIG. 1, the vertically long arm 4 is loosely inserted into the vertical hole 6 of the copying machine main body 5 so that the hinge 6 can swing up and down, and as shown in FIG. The whole was brought into contact with the mounting surface 2.

However, since the original document pressure bonding plate 1 of the above-mentioned conventional example integrates the hinge 5 and the arm 4, the structure is 41&(li), resulting in high cost.

Furthermore, FIG. 2(g) shows another conventional first-print pressure bonding plate.

This document pressure bonding plate 11 has two hinges, a first hinge 1B and a second hinge 19, instead of moving the hinge 6 upward when copying a thick object as in the previous example.
As shown in Figure G), the small part for copying the thick original 17 is the holder. This document pressure bonding plate 11 has a relatively simple structure compared to the previous example, and allows a thick document 17 to be placed thereon.

However, the configuration shown in FIG. 2 was undesirable because it had two hinges, so its lifespan was poor.

The present invention has been made in view of the drawbacks of the conventional examples mentioned above,
To provide a document pressing device which can move a pressing part to meet a thick document, can evenly press the document, and has a long service life.

An object of the present invention is to consist of a mounting part for mounting on the main body of an image forming apparatus, and a pressing part that is rotatably provided with respect to the mounting part and presses a document on a document mounting table. This is achieved by using a document pressing device in which a mounting portion is rotatably mounted to the main body so that the mounting portion moves upward relative to the document mounting table.

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. This is a document base plate for fixing the placing base 22 to the attachment portion 60 to the copying machine main body and for attaching the document pressure bonding device 21. The document pressing device 21 mainly includes a pressing section 21a (including a document pressing member 20) for pressing a document, and a document base plate 23.
It consists of an attachment part 21b for attaching to. This figure (FIG. 6) shows a state in which the original pressure bonding device 21 is positioned on the original base plate 26, and the protrusion 21 b / of the mounting portion 211) is loosely inserted into the hole 23 & provided on the original base plate 23. The elastic member 66 inserted and positioned and attached to the attachment part 21b engages with the hook part 23b of the document base plate 26, thereby biasing it in the direction of the arrow in the figure and holding the attachment part 21b in a predetermined position. are doing.

Furthermore, the mounting portion 21kl attached to the document platen 26 and the pressing portion 21a are integrally formed by an extremely thin groove portion (hinge portion) 21c, and the suppressing portion 21& is formed by this groove portion 21(
It is configured to be rotatable around l. In this embodiment, the pressing part 21a1, the mounting part 21b1, the groove part 210, etc. are made of polypropylene, which can be bent without breaking in a thin layer state. Further, 21d is a stopper member that is molded integrally with the pressing portion 21EL or is attached separately.

Next, based on FIG. 4 (&) to (0), the original pressing device 2
1 to the original base plate 26 will be explained. First, slide the take-off part 21b of the original pressing device 21 in the direction of the arrow 1. The tip 33 of
& engages with the lower part of the hooking portion 25b of the document base plate 23, and as it slides further in the direction of the arrow as shown in FIG.
deform in the direction. The deforming force is applied to the mounting portion 211
) acts as a force that pushes the paper in the direction of the arrow. As it slides further, the protrusion 21b' climbs over the corner 230 of the document base plate 2 as shown in FIG. 40 and is loosely inserted into the hole 25a, and is positioned as shown in FIG. Ru.

Therefore, when the operator wants to install the original pressing device 21, he only needs to place the original pressing device 21 in a predetermined position and slide it in a predetermined direction as described above. This is much simpler and easier to operate than the conventional document crimping device, which has several screws or the like and is attached and detached using a skewer that removes the screws. Further, when removing the original pressing device, the mounting portion 21b can be removed by simply shifting it upward to the position shown in FIG. 40, and then moving it in the opposite direction of the arrow.

Next, the operation of the document pressing device when a thick document 7 is placed will be explained based on FIG. The mounting portion 211) is positioned with respect to the document base plate 26 by engagement between the protrusion 21b' and the hole 23&, and is held by the biasing force of the elastic member 16 in the inward direction so as not to be separated from the predetermined position. In other words,
When the thick original 7 is placed on the original placing table 22, the attachment part 2
11) overcomes the urging force of the elastic member 66 and the projection 21b
It rotates in the direction of 61 degrees around the center, and the groove portion 210 moves upward with respect to the document platen 26. In this way, the mounting part 2i
The positioning means (2
1t+) and the elastic member 66 that attempts to hold the mounting part in a predetermined position, the mounting part 21b
becomes rotatable, and the groove portion 210 moves upward, making it possible to place the thick materials IJi and KAI7 as shown in the figure.

Next, based on FIG. 6, the operation of the document pressing device when the pressing section 21 & is opened will be explained. As the pressing part 21& is opened, the stopper member 2 closes to the opening angle of 90°.
1d comes to the position indicated by the chain double-dashed line in the figure. In this process, the tip of the stopper member 21d comes into contact with the document platen 2, and the mounting portion 21b is pushed against the urging force of the elastic body 36 to prevent the protrusion 21d from moving.
1b' as the center in the direction of time d1 (indicated by the two-dot chain line in the figure). As shown in the figure, this is between the distance 1 between the groove 210, which is the center of rotation of the pressing part 21&, and the original base plate 2'5, and the radius drawn by the stopper part JFA' 21a when the pressing part 211L rotates. This is because there is a relationship l<L.

Therefore, when the pressing part 21a is in the open state as shown by the solid line in the figure, the biasing force in the direction of entry by the elastic body 63 is applied to the pressing part 21a.
The stopper member 2, which is located on the left side of the groove 210, works to lower the groove 210 downward with the weight of the stopper member 1&.
The tip of the document 1d receives an upward force from the original base plate 26 as a reaction force. That is, in this state, the suppressing portion 21+L maintains an open state while receiving a clockwise rotational force (indicated by arrow B).

With the above configuration, when the operator fully opens the suppressing portion 211L to place or replace a copy document, if the position shown by the two-dot chain line in the figure is exceeded (i.e.,
When the contact point a between the stopper member 21T1 and the original base plate 26 is located on the left side of the groove portion 21 (l), the pressing portion 2
1& is rotationally biased in the direction of arrow B in the figure, even when the pressing portion 211L is forcefully opened.
The inconvenience that the pressing part 21& falls into the closed state due to the reaction does not occur.

The above is a description of one embodiment of the original pressing device according to the present invention, but it goes without saying that the present invention is not limited thereto.

For example, in the above-mentioned embodiment, the explanation was given of an original pressing device with a hinge structure in which the suppressing part and the mounting part are integrally molded through an extremely thin wall, but the application is also applicable to original pressing devices with other hinge structures. I can do that.

Furthermore, the rotation inhibiting position of the suppressing section is 90 as shown in FIG.
The stopper member 21d is not limited to the vicinity of the document base plate 2 at a position slightly counterclockwise rotated back from the open position shown in FIG.
6 and may be restrained.

Further, the stopper member 21cl may be brought into contact with the document mounting table 22.

Since the original pressing device according to the present invention 1 (l) has the above-mentioned configuration, even though the 4th precept is extremely simplified, it can reliably press thick originals and the lifespan is reduced by 1. There is an effect.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of a conventional document pressure bonding plate, Figure 2 <A)~
FIG. 20 is a side sectional view of another conventional document pressure bonding plate, and the fifth quotient is a side sectional view of the IQ positive pressure bonding plate according to the present invention.
Figure 4C) shows the assembly procedure of the crimp plate in Figure 6.
FIG. 5 is a side sectional view of the document pressure plate according to the present invention on which a thick document is placed, and FIG. 6 is an operational explanatory diagram for explaining the present invention in detail. 2111・Tube original pressure bonding device, 211L...pressing part, 2
1b...Function attachment part, 21c...Groove part (hinge), 21
d...Stopper, 22φ...Document mounting table, 23...
@Manuscript plate, 66Φ...Elastic member. Applicant Canon Co., Ltd.

Claims (2)

[Claims] (1) Consists of a mounting part for mounting on the main body of the image forming device, and a pressing part that is rotatably provided with respect to the mounting part and presses the original on the document mounting table, and the pressing part rotates. A document pressing device characterized in that the attachment portion is rotatably attached to the main body so that the center moves upward with respect to the document placement table. (2) The pressing part and the handle part are connected by a hinge, and the hinge is used as the rotation center of the pressing part, and the mounting part can be rotated to the document mounting table via the positioning means and the elastic part side. The original pressing device according to claim 1, characterized in that the original pressing device is supported by.