JPS5926937B2 - Original crimping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a document pressing device for an image forming apparatus such as a copying machine.

More specifically, the present invention relates to an original pressing device that can effectively press even thick originals onto an original placing surface. The explanation will be given below using a copying machine as an example.

Copying machines are usually equipped with a so-called original pressing device for the purpose of holding down the original and blocking external light.

These crimping devices have two types: one has a hard crimping plate with a back plate made of a hard material, and the other has a soft crimping plate with a back plate made of a flexible material such as rubber. There is. The problem that always arises with these crimp plates is the first
As shown in FIG. a and FIG. Since the parts are fixed, the function of the crimp plate cannot be fully performed. This tendency is particularly noticeable in hard crimp plates. Conventionally, in order to solve this problem, the crimp plate was made removable.

Alternatively, measures have been taken such as providing a bearing on the document table side for sliding the other end of the bonding plate in the vertical direction. However, this method has problems such as troublesome operation, complicated mechanism, and difficulty in determining the material and positional relationship of the bearing part. Therefore, the present invention solves the above-mentioned problems while having a very simple structure, and can effectively press a thick original even with a hard pressure bonding plate.

That is, the present invention, which achieves the above object, is an original pressing device for pressing an original against an original placing surface, which includes a pressing member having an opening formed at one end, and a pressing member that can be raised and lowered with respect to the original placing surface. a lever member which is rotatably supported at one end thereof, and which is bent in a step-like manner and includes a rising portion extending in a direction away from the document placement surface in the vicinity of the supporting portion; The pressure bonding member is engaged with the lever member by engaging the opening portion so as to be movable in the rising direction with respect to the rising portion.

Hereinafter, one embodiment of the present invention will be described in detail using FIGS. 2A, b, and c.

In the figure, reference numeral 5 denotes a document pressure bonding plate, which may be either a hard type or a soft type.

Two elongated holes 5a are provided in the crimp plate 5 near the hinge side end of the crimp plate 5. Also, 6
is a lever member that supports the pressure bonding plate 5 when the pressure bonding plate 5 is lifted from the document placement surface 7. This lever member 6 is approximately [
It has a U-shape, and both ends thereof are bent outward to form a rotating shaft portion 6b, and this rotating shaft portion 6b is rotatably fitted into a bearing member 9 fixed to the document table 8. . Further, this lever member 6 has a rising portion 6a on the bearing member 9 side that is bent in a direction substantially perpendicular to the document placement surface 7 when the pressure bonding plate 5 is closed. (Figure 2b). The lever member 6 is engaged with the pressure bonding plate 5 by the rising portion 6a passing through the elongated hole 5a. Therefore, the pressure bonding plate 5 is opened and closed around the bearing member 9 by grasping the handle 10 and lifting it up. When the crimp plate 5 is opened, the rising portion 6 of the lever member 6
The a end 6c contacts the document table 8, and the lever member 6 becomes independent and supports the pressure bonding plate 5 in a lifted state (FIG. 2c). Further, by engagement between the rising portion 6a and the elongated hole 5a of the pressure bonding plate 5, the pressure bonding plate 5 can be moved in the vertical direction with respect to the document placement surface 7 along the rising portion 6a. Therefore, even when a three-dimensional object 11 such as a book must be placed as a document, the entire pressure bonding plate can move up and down according to the shape of the document, making it easy to place the document 11 on the document placement surface 7. Moreover, the entire document 11 can be pressed uniformly (FIG. 2b). In addition, the reason why the through hole of the crimp plate 5 is made into an elongated hole is because
When the lever member 6 and the pressure bonding plate 5 are easily assembled, and a large document must be placed, the shaft portion 6b of the lever member 6 is inserted into the elongated hole 5a. This is because the shaft portion 6b and the bearing portion 9 on the document table side can be easily released by moving them closer to each other in the direction of the arrow a along the arrow a.

Therefore, if these can be done by other means, for example by assembling the lever member and the shaft separately, a simple round hole or square hole may be used. Alternatively, a separate member having such a hole or the like may be engaged with the lever, and that member may be fixed to the crimp plate, or in the case of soft material, a long hole 5b as shown in Fig. 2d may be used. In this case, since the pressure bonding plate is soft, there is no problem in attaching and detaching the lever, and on the other hand, various applications such as being able to eliminate backlash in the front and back direction are possible. Furthermore, the rising portion 6a of the lever member 6 and the bearing portion 9
By adjusting the position of the rising part 6a or the height of the rising part 6a, when the crimp plate 5 is opened as described above, it can be set so that the rising part apex 6c is the stopper and stops at a predetermined opening angle. I can do it. In addition, so that the end portion 5c of the crimp plate 5 on the bearing member 9 side does not interfere with opening and closing,
Of course, the distance between the rising portion 6a of the lever member 6 and the rotating shaft portion 6b must be taken into consideration. Furthermore, in this embodiment, the arcuate portion 6d of the lever member 6 is not engaged with the pressure bonding plate 5 and is in a free state. Therefore, when holding down a thick original, the lever member 6 is moved by the bearing member 9 as shown in FIG. 2b.
The pressure bonding plate 5 also freely rises along the thick original 11, and can press the original with uniform force. Furthermore, another embodiment will be described with reference to FIG.

In this embodiment, the lever member 13 of the previous embodiment is attached to a pressure bonding plate 12.
It is fixed to. That is, the cylindrical portions 14a, 14b, and 14c are fixedly installed on the opening/closing side of the crimp plate 12, and the cylindrical portions 14a,
The lever member 13 is rotatably fitted into 14b and 14c. For this reason, in the case of the embodiment described above, the crimp plate 5 made of a particularly soft material sometimes moved inadvertently in the longitudinal direction of the crimp plate, but in the present embodiment, such a problem does not occur. The reliability of operation can be increased. In addition, the lever member 13 serves as a backbone, and even if a weak material is used for the crimp plate 12, it will not sag and will stick tightly to the document, improving operability. can be done. Further, as shown in the figure, the lever members between the respective cylinder parts may be formed into convex portions 13a, 13b. By doing so, the convex portions 13a, 13b can be used as handles, and operability can be further improved. I can do it. Furthermore, the lever member may be formed integrally with the pressure bonding plate.
This further simplifies the configuration. Further, another embodiment will be described using FIGS. 4a and 4b.

In this embodiment, the pressure bonding plate 15 and the lever member 16 are connected to the pressure bonding plate 1.
This is an example in which the document mounting surface 17 is movably engaged in the vertical direction with respect to the document placement surface 17 near the end of the document placement surface 17. That is, two holes 15a and 15b are provided near the end of the crimp plate 15, and the elongated holes 15a and 1
5b through which the lever member 16 passes. Also in this embodiment, the elongated holes 15a, 15 of the lever member 16
When the pressure bonding plate 15 is in the closed state, the portions engaged with the portions 16b and 16b are the rising portions 16a, 1 that are approximately perpendicular to the document placement surface.
6b. Further, the lever members 16 are connected 18 to each other after passing through an elongated hole 15b provided at the feeding side end of the pressure bonding plate 15. Therefore, as shown in FIG. 4B, even when a thick original 19 is placed, the pressure bonding plate 15 moves upward along the original 19, and can press the original with a uniform force. Furthermore, when closing the opened crimp plate again, if the crimp plate 15 or the lever member 16 is operated, these will be closed as one, further increasing the operability. As described above, the present invention allows at least one end of the document pressing member to be movably supported in the vertical direction of the document placement surface with respect to the support member, thereby effectively pressing even a thick document onto the document placement surface. It is something that can be done.

Furthermore, since it is only necessary to form an opening in the crimping member and attach it to the upright part of the lever member, which is a support member, so that it can move up and down, the configuration is extremely simple, and the device can be made smaller and lighter (with fewer parts). (reduction in the pressure, ease of assembly), and the ability to cope with changes in document thickness by moving the pressure bonding member up and down, making it easier to press the document.

[Brief explanation of the drawing]

FIGS. 1a and 1b are side views of a conventional original pressing device;
Figure 2a is a perspective view of an embodiment of the present invention, Figure 2b is a perspective view of an embodiment of the present invention;
Figure c is a side view thereof, Figure 2d is a perspective view showing a modification of Figure 2a, Figure 3 is a perspective view of another embodiment, Figure 4a is a perspective view of still another embodiment, FIG. 4b is a side view thereof. In the figure, 1...Original placement surface, 2...
・Original, 3...Crimping plate, 4...Original table, 5...Crimping plate, 5a...Elongated hole, 6.
... Lever member, 6a ... Standing portion, 7 ... Document placement surface, 6b ... Rotating shaft portion, 9 ... Bearing member , 12, 15...
Crimping plate, 13, 16...Lever member, 16a,
16b...Rising part.

Claims (1)

[Scope of Claims] 1. A document pressure bonding device for pressing a document against a document placement surface, which includes a pressure bonding member having an opening formed at one end, and a pressure bonding member formed at one end so as to be tiltable with respect to the document placement surface. a lever member that is rotatably supported, has a raised portion extending away from the document placement surface in the vicinity of the support portion, and is bent in a stepped manner. A document pressing device characterized in that the pressing member is attached to the lever member with the opening portion being engaged with the rising portion so as to be movable in the rising direction.