JPH03111833A - Original pressing device - Google Patents

Abstract

PURPOSE:To prevent an original from deviating and flying when the original is set or when the pressing plate is opened by providing the original pressing device with a means which can suck and release the original. CONSTITUTION:The original pressing device 8 is opened, the original 12 is aligned with an index 17 and pressed against an original pressing member 10, and then a suction switch is turned on to suck air through small holes 11 of the member 10 by suction 9 through a vacuum sucking device 14, thereby fixing the original 12 in contact with the member 10. Then the device 8 is lowered, a specific copy is taken, and the device 8 is lifted; and the suction switch is turned off and the original 8 is removed. Further, the device 8 is provided with an actuator, a main body 2 is provided with an actuator, and a microswitch is provided to the main body 2 to detect the opening/closing state of the device 8, thereby stopping the suction automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a document pressing device for an image forming apparatus using, for example, an electrophotographic method.

[Prior Art] Conventionally, in the original pressing device of an electrophotographic copying machine, there has been a method disclosed in Japanese Patent Application Laid-Open No. 58-505, which aims to reliably suppress the original.
An auxiliary crimping device as shown in No. 62 has been installed to prevent the original from floating or flying.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional document pressing device, the document cannot always be pressed reliably due to space constraints of the auxiliary pressing device.

Particularly in the case of curled originals such as FAX paper, folded originals, thin paper, etc., the original may be misaligned during the operation of closing the original pressing plate after setting the original.

The present invention has been made in view of the above-mentioned conventional problems, and it is an object of the present invention to provide an original pressing device that can reliably set even curled originals and folded originals without shifting them.

[Means and effects for solving the problem] According to the present invention, by providing the document pressure device with a means that can be adsorbed and released at will, it is possible to prevent the document from shifting or flying when setting the document or opening the pressure bonding plate. This is designed to improve operability.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of the original pressing device according to the present invention, and M2 has a thickness of 11181. =) Suhara Risho Art Post Office Ha Kangsang M Shijinru.

In Fig. 1, 1 is the original table glass, 2 is the main body of the copying machine, 3 to 7 are the hinge parts of the original pressing device, 8 is the original pressing device, 9 is the suction, and 10 is the white elastic original pressing member. There are multiple stages of small holes 11 for adsorbing the original 12 (second
(see figure). When setting the original 12 with the original pressing device 8 in the open state, first, the original 12 is pressed against the original pressing member 10 in accordance with the indicators shown in FIG. Next, turn on the suction switch provided on the control unit (not shown) of the copying machine.
Then start adsorption. Then, suction is started by a known vacuum suction device 14, and air is suctioned from the pores 11 of the document pressing member 10 by the suction 9 and the suction pipe 13. Then, the document 12 is brought into close contact with the document pressing member 10 and fixed. Incidentally, excess air is exhausted from the exhaust pipe 15.

In this state, curled originals, folded originals, thin paper, etc. are firmly held and there is no fear of them shifting.

Next, the original pressing device 8 is lowered, and when the original pressing device 8 is raised again after the predetermined copying has been completed, the original 12 remains in the adsorbed state as shown in FIG.

Therefore, it is possible to prevent the original from flying when the original pressing plate is opened. Next, when the suction switch is turned OFF to end the suction, the document 12 can be removed.

[Other Embodiments] <Embodiment 2> FIG. 3 is a cross-sectional view of a document pressure bonding device according to a second embodiment of the present invention. The structure is basically the same as that of the first embodiment, or by providing an actuator 18 and a microswitch 19, it is possible to detect the open/closed state of the document pressure plate. Note that this mechanism may be used in conjunction with a mechanism used in a document size detection device.

With this configuration, it is possible to automatically stop the suction by detecting that the original pressing device 8 is raised after copying is completed, further improving operability.

<Embodiment 3> Although the document pressing apparatus according to the present invention described above uses a vacuum method as a suction mechanism, other suction methods such as electrostatic suction may be used.

[Effects of the Invention] As explained above, a document can be arbitrarily adsorbed and attached to the document pressure device.
By providing a release means, it is possible to reliably set curled originals, folded originals, thin paper, etc., and also prevents the original from flying away when the pressure bonding plate is opened, thereby improving operability.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an original pressing device according to the invention, FIG. 2 is a perspective view of the original pressing device according to the invention, and FIG. 3 is a sectional view of another embodiment of the original pressing device according to the invention. 1: Copying machine body, 2: Original table, 3: Support rod, 4: Hinge fitting, 5: Shaft, 6: Coil spring, 7: Spring holding rod, 8: Original pressure bonding plate, 9: Suction, 10: Original pressing member, 11: Pore, 12: Original, 13: Suction pipe, 14
: Suction device, 15: Exhaust pipe, 16: Document position indicator,
17: Original position indicator on the original pressing plate side, 18: Actuator, 19: Micro switch.

Claims (1)

[Scope of Claims] In a document pressing device of an image forming apparatus, the document pressing member for pressing a document onto the document placing table is provided on an image forming apparatus main body equipped with a document placing table so as to be openable and closable. A document pressure bonding device characterized in that the document pressure bonding device is provided with a means for arbitrarily adsorbing and releasing a document.