JPS6270829A - Original pressing plate - Google Patents

Abstract

PURPOSE:To adhere tightly and precisely an original to an original placing table, by laminating an original pressing sheet, a buffer member layer and an casing sheet member to which tensile force is to be applied successively and constituting the casing sheet of one end pivotally fixed to the original placing table and one end having a fixing member to be attached/detached to/from the original placing table. CONSTITUTION:The fixing member 43 to be attached/detached to/from a fixing member 44 is fitted to one end of the thin casing sheet 41 and the fixing member 44 is fitted to a holding guide 25. For instance, a magic tape is used for the fixing members 43, 44. When the fixing members 43, 44 are locked by pressing the thin casing sheet 41 downward while applying tensile force to the sheet 41 in the arrow B direction, the fixing member 43 presses the sheet 41 obliquely downward. Consequently, the buffer member 27 is compressed, an original press sheet 28 is pressed against the original 9 and the original 9 is tightly adhered to a platen glass 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] "Industrial Application Field" The present invention relates to a lightweight original pressure bonding plate in a copying apparatus such as an image forming apparatus such as an electronic copying machine.

``Prior Art'' Figure 4 shows a front sectional view of a conventional electronic copying machine, in which a photosensitive drum 2 having a photoconductive layer provided on a conductive drum base is rotatable in the direction of the arrow. It is pivoted.

A corona charger 3, a short focus optical element array 4, a developing device 5, a transfer corona discharger 6, and a cleaning device 7 are arranged around the photosensitive drum 2 in accordance with the rotating direction of the photosensitive drum 2.

In the copying apparatus described above, the surface of the photosensitive drum 2 is uniformly charged with a predetermined polarity by the corona charger 3, and then the original 9 placed between the platen glass 10 and the original pressing plate 8 which move back and forth at the upper part of the main body of the apparatus. is illuminated by a lamp 11, and the photosensitive drum 2 is exposed to reflected light via the element array 4 to form a latent image. The formed latent image is developed by a developing device 5, and the developed image is transferred to a transfer material by a transfer corona discharger 6. The transfer material is supplied to the transfer material supply tray 12 by an operator's manual operation, and is conveyed to the transfer section via the conveyance roller 16 and the timing roller 14. The transfer material that has been transferred is separated by the separating means 15, sent to the fixing device 17 via the moving path 16, where it is fixed, and further transferred to the ejection roller 18.
The paper is sent out onto the paper discharge tray 19 via the paper.

FIG. 5 is a diagram showing the periphery of the document pressure bonding plate, and is a longitudinal sectional view perpendicular to the plane of FIG. 4. In FIG. 5, 20 is a housing of an electronic copying machine, and a rail 21 is fixed to one side of the top surface in a direction perpendicular to the plane of the paper, and an L-shaped end support guide 23 is provided on the other side. . A slide guide 22 that engages with the rail 21 is fixed to a holding member 24.

Reference numeral 10 denotes a platen glass on which the document 9 is placed, the - side is fixed to the holding member 24, and the other side is fixed to the edge holding guide 25, so that the platen glass 10 and the edge holding guide 25 are connected to the guide 23. It is designed to guide you through the process. A document pressure bonding plate 8 is provided in the L-shaped groove provided on the holding member 24.
An L-shaped locking strip 31 of the document holding plate 26 is fitted and fixed, a buffer member 27 made of sponge or the like is attached to the lower surface of the document holding plate 26, and a document holding sheet 28 with a smooth white surface is further attached. It is attached and the manuscript plate 26
At one end there is a grooved hinge 5 for opening and closing in the direction of arrow A.
2 and 33 are provided.

In this way, in an electronic copying machine, the platen glass 10
Generally, the original 9 is placed on top of the original 9 with its copy side aligned, and the original 9 is fixed with an original pressure bonding plate 8.

This original pressure bonding plate 8 is usually made of a document pressing sheet 28 having a buffer member 27 or a thick flexible rubber material, in order to maintain close contact between the original 9 and the platen glass 10 by making the original 9 follow the platen glass 10 and holding it by gravity. A document holding plate 26 made of plastic or the like is used.

"Problems to be Solved by the Invention" On the other hand, in recent years, copying devices have become smaller and lighter, and there has been a demand for easily portable copying devices. It is necessary to reduce the weight of the However, the document pressure bonding plate 8 as explained in FIG. 5 is heavy, and this type requires weight, so that the weight reduction is small. For this purpose, as shown in FIG. 6, it is conceivable to use a document pressing plate 81 in which the document pressing plate 26 in FIG. 5 is replaced with a thin outer sheet 41.

However, when using the thin outer sheet 41 as a document holding member in this way, it is too light, and furthermore, because the outer sheet 41 is thin and flexible, the platen glass 1
0, the adhesion is poor due to insufficient pressure on the document surface, so even if the document 9 is a sheet, it may float a little.
Alternatively, the creases of the original document 9 appear as wrinkle marks on the copy, resulting in an unsatisfactory copy with blurred or shadowed characters.

An object of the present invention is to improve the adhesion when pressing a document on a platen glass with such a light document pressure bonding plate.

[Structure of the invention]

"Means for Solving the Problems" The present invention is comprised of a document holding sheet, a buffer layer, and a tension-applying outer sheet member, which are laminated in this order, and the outer sheet is rotatably fixed to a document mounting table. The document pressure bonding plate is characterized in that it has one end and a fixing member that is removably attached to the document table.

``Function'' When a document is placed on the document placement table, the document pressure plates are placed on top of each other, and the outer cover sheet is tensioned by the fixing member at the end of the outer cover sheet member and fixed to the document placement table, the document holding sheet is compressed by the outer cover sheet. The original is pressed all over by the cushioning member layer, and the original is brought into close contact with the platen glass.

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

The same functional parts that have already been explained in the conventional example etc. are given the same reference numerals and their explanations are omitted.

FIG. 1 is a side sectional view. A fixing member 43 that can be attached to and removed from a fixing member 44 is attached to one end of the thin outer sheet 41, and a fixing member 44 is attached to the holding guide 25. Fixed member 43.44
An example of this is Velcro tape. As shown in FIG. 2, the thin outer skin sheet 41 is pressed downward while applying tension in the direction of arrow B to lock the fixing members 43 and 44. Therefore, the fixing member 43 presses down the outer cover sheet 41 diagonally downward, so that the buffer member 27 is compressed, the document holding sheet 28 presses the document 9, and the document 9 is brought into close contact with the platen glass 10.

FIG. 3 is a side sectional view of another embodiment of the invention. This embodiment is suitable for cases where the original is larger than the previous embodiment. In the embodiment described above, depending on the degree of flexibility of the buffer member 27 made of sponge or the like, when the length L of the document 9 is long, the close contact may not be perfect and marks such as wrinkles on the document 9 may become shadows. In FIG. 6, the buffer member 42 has a central thickness tl in the length J direction, a thickness tl at both ends, t+>tl, and the document holding sheet 2B is a quadratic curved surface convex toward the platen glass 10. be.

The outer cover sheet 41 is a curved surface or a flat plate facing in the opposite direction to the document holding sheet 28. The thickness tl at the center of the buffer member 42 can be arbitrarily selected depending on the softness of the buffer member 42 and the thickness tl at both ends, but normally t1 is preferably in the range of 1.1 to 2 times tl. Further, the thin outer sheet 41 can be made of a material such as a plastic sheet, cloth, or synthetic paper.

The fixing members 43 and 44 may be made of Velcro or other materials that are easy to attach, such as magnets.

The fixing members 45 and 44 in each embodiment may be provided along the entire length of one side of the original pressure bonding plate, or may be provided at an appropriate location, or may be provided to fix multiple sides of the document pressure bonding plate. good. In the second embodiment, the document holding sheet may be formed into a cubic curved surface with a middle and height facing toward the platen glass.

〔Effect of the invention〕

The present invention is made up of a document holding sheet, a buffering member layer, and an outer cover sheet member for applying tension, which are laminated in this order, and the outer cover sheet has one end rotatably fixed to the document mounting table and is removably attached to the document mounting table. Since the document pressure bonding plate is characterized in that it consists of one end having a fixing member, the document pressure bonding plate is lightweight and has the effect of reliably bringing the document into close contact with the document placement table.

[Brief explanation of drawings]

1 and 2 are side sectional views of an embodiment of the present invention, FIG. 3 is a side sectional view of another embodiment, FIG. 4 is a vertical sectional view of a conventional electronic copying machine, and FIG. 5 is a side sectional view of an embodiment of the present invention. FIG. 4 is a partially enlarged detailed view, and FIG. 6 is a side sectional view showing a modification of FIG. 5. 27...Buffer member 28...Document holding sheet 41...Outer cover sheet 43...Fixing member.

Claims (1)

[Scope of Claims] 1. Consisting of a document holding sheet, a buffer member layer, and an outer cover sheet member for applying tension, which are laminated in this order, and the outer cover sheet has one end rotatably fixed to the document placement table and one end that is rotatably fixed to the document placement table. A document pressure bonding plate comprising one end having a fixing member that can be attached to and detached from a table.