JPS6028645A - Exposure region controller of copying machine - Google Patents

Abstract

PURPOSE:To prevent the light for exposure from leaking to the outside from the peripheral part of an original and copy safely the original which cannot be covered, by controlling the exposure region of a platen glass in accordance with a copy size and displaying accurately and directly the region which can be copied. CONSTITUTION:An exposure region controller is arranged at the rear face side of a platen glass 2 of a copying machine body 1 and is constituted of a pair of light shielding sheets 3a and 3b, which are moved longitudinally and laterally along the rear face of the glass, and driving means 4. Sheets 3a and 3b consist of opaque films and are provided with many through holes 5 having prescribed pitch intervals in the length wise direction in both side edge parts. The means 4 is constituted of a sprocket 7 and a forward and backward rotatable motor 8. Projections 6 on the sprocket 7 are engaged with holes 5 to move sheets 3a and 3b back and forth by the motor 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention regulates the exposure area on a platen glass on which a copy original is placed in a copying machine, and controls the exposure area from the periphery of the copy original placed on the platen glass during exposure. The present invention relates to an exposure area regulating device for a copying machine that prevents light from leaking and accurately displays a copyable area on a platen glass.

[Prior art]

When making copies with a copier, it may become impossible to close the platen cover if the original to be copied is, for example, a bound original.In such cases, the strong light during exposure may be placed on the platen glass. The light leaks out from around the copied document and enters the eyes of people around the operator, such as the operator.The strong light during exposure places a heavy strain on the eyes of these people, and some countermeasures have been required. In particular, we have adopted a flash exposure system that shortens exposure time and improves copying speed by exposing the entire document placed on the nib glass at once to a flash to form an electrostatic latent image on the photoreceptor. In some copying machines, a level of light that is dangerous to the operator's eyes may be emitted during flash exposure, and in such cases, copies cannot be made with the platen cover open, and the platen cover must be removed. If the document cannot be closed, a situation may arise in which it will not be possible to copy or make a copy.

Here's the trick: When making a copy, the operator selects a copy paper size and places the original in line with the copyable area indicated on one side of the platen glass. The display usually only indicates the vertical and horizontal dimensions of the copy paper using A; B4, A4.135, etc., and is indirect, especially when a large number of copies of originals are to be copied in succession. When copying, it may take some time to align the original to be copied, or the set position of the original to be copied may be misaligned, resulting in erroneous copying.

C. OBJECT OF THE INVENTION Accordingly, an object of the present invention is to solve the four various problems in such conventional copying machines, and to regulate the exposure range on the platen glass according to the size of the selected copy paper. This eliminates the possibility of light leaking from around the copy document placed on the platen glass during exposure and irritating the operator's eyes, and the copyable area is directly and accurately displayed on the platen glass. An object of the present invention is to provide an exposure area regulating device for a copying machine that allows a copy original to be accurately and quickly set in an exposure area of a platen glass.

[Structure of the invention]

That is, in the present invention, a pair of light-shielding sheets are provided on the lower surface side of the platen glass, and each light-shielding sheet is provided with a drive means for its reciprocating motion. is provided, and each of the light-shielding sheets is advanced or retreated by the respective driving means according to the size of the selected copy paper, thereby creating an exposure area on the platen glass according to the size of the copy paper, and making copies possible on this platen glass. This is an exposure area regulating device for a copying machine that directly displays the area.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

1 and 2, a copying machine to which an exposure area regulating device according to an embodiment of the present invention is applied is shown. This exposure area regulating device is provided in the -1 part of the housing i11 of the copying machine, is arranged on the lower surface side of the platen glass (2), and is moved back and forth along the lower surface of the platen glass (2). .

-1.Each light-shielding sheet 1- (+3; 1) (3α) is made of an opaque film that can block light during exposure. A large number of through holes (5) having a predetermined pitch interval are bored ( ).

1, the driving means (4) for reciprocating the valley light-shielding sheets (3a) (36') is the above-mentioned light-shielding sheet) C38X
Numerous protrusions that engage with the through holes (5) formed at 3θ) +6
1 with a tin rocket (7) and this sprocket (
It consists of a motor (814) that can rotate in forward and reverse directions to rotate the motor (814).

The reciprocating motion of each of these light-shielding sheets) (3aX:M') is controlled by driving the motor (8).
(7+) to engage the protrusions (6) of this sprocket (7) with the through holes (5) on both side edges of each light shielding sheet (3a) (3C), thereby each light shielding sheet) (3
a) Exposure area (3) on the platen glass (2) is moved back and forth on the lower surface side of the platen glass (2).
R).

As shown in FIG. 1, a copying machine to which this embodiment is applied is equipped with a photosensitive belt (9) as a photosensitive member in its nozzle (11), and has a platen glass (21) on which a copy document is placed seven times. (A so-called flash exposure system is adopted, which can project and expose 10 entire images onto the photosensitive belt (9) at once, thereby shortening the exposure time and improving the copying speed.

In addition, each light-shielding sheet 1-(3a)(3
1), as shown in Figures 2 to 5, its tip penetrates the wall surface of the housing (11), and its both side edges are platen glass 2) on the bottom side of the front and rear edges, or on both the left and right sides. It is designed to be guided by sliding in each pair of guide grooves (112X11fA) formed on the inner wall surface of the housing (11) on the lower edge surface.
) (11?) are formed with their positions shifted vertically from each other, and each light-shielding sheet guided by each pair of guide grooves (11η) (II-g) is
, one of the light-shielding sheets (3a) moves back and forth in the front-back direction to set the exposure area in the front-back direction on the platen glass (2), and the other light-shielding sheet (3e) moves back and forth in the left-right direction to set the exposure area on the platen glass (2). /-i in (2): Set the exposure area in the right direction, define the exposure area (1 mode) by combining these exposure area settings in the front and back direction and /i (right direction, and set the exposure area (1 mode). For the parts other than 1t), each light-shielding sheet 1- (C) (, M) prevents light from leaking to the outside.
) is provided with a part of a thick stopper (screw) at the tip of each light-shielding sheet (3).
2) The tip of the (3σ) is prevented from passing through the wall surface of the housing (1) and coming off from the inside of each guide groove (11a) (114).

Furthermore, in this embodiment, the exposure range (R) is determined by the motor (8) which can rotate in forward and reverse directions constituting each of the driving means (4), based on information from the copy paper size selection section and the copy magnification selection section. Controlled by a microprocessor that calculates and outputs control signals! ′〆There is.

Therefore, according to this embodiment, by selecting the desired copy paper size and selecting the copy magnification, the motor (8) of each drive means (4) can be moved in the forward or reverse direction by a certain amount. rotates, thereby each sprocket (7) connected to each motor (8) connects each light shielding sheet (3aX
B) is moved by a certain amount in the front-back or left-right direction, thereby setting an exposure area (几) in an area calculated based on the size of the copy paper and the copy magnification, and this exposure area (R) The copyable area is directly displayed on the platen glass (2) through the platen glass (2).

In the above embodiments, the present invention is applied to a copying machine that employs a flash exposure system. (Of course, the present invention can also be used in this case.

In the above embodiment, each guide groove (Ila) (INF) is formed using the inner wall surface of the housing (1), but these guide grooves (1taXx1-g) are formed by using the inner wall surface of the housing (11). In addition to forming channels, for example, channels may be formed on the F side of both front and rear edges of the platen glass (2) and on the lower side of both left and right edges.

I1 Effect of the invention] Since the present invention has one or more configurations,
“The exposure area on the platen glass is regulated according to the size of the copy paper, and at the same time, the area that can be copied is accurately and directly displayed on this platen glass.For this reason, the original to be copied is set in the exposure area of the platen glass. When the original is copied, the exposed tip will not directly leak out from around the area, and even if the platen cover is opened, the copy will not be a big strain on the operator's eyes.
To safely copy originals for which the platen cover cannot be closed. Moreover, since the area that can be copied is directly displayed on the platen glass, it is extremely easy to set the copy original in its designated position, making copying operations easier and preventing mistakes in copying. It is also useful for prevention.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a copying machine with a flash exposure system to which an exposure area regulating device according to an embodiment of the present invention is applied.
FIG. 2 is a perspective view showing an exposure area regulating device according to an embodiment of the present invention, FIG. 3 is a sectional view taken along line 11.1-■ in FIG. 2, and FIG. 4 is a sectional view taken along line y--■ in FIG. FIG. 5 is a partial perspective view showing the guide groove of FIG. 2. fll...Housing (2)...Platen glass (
32X3σ le...shading sheet (4)...driving means (5)
...Through hole (6), protrusion (7)...Sprocket (8)...Motor (11, 2) (1 catch)...Guide groove (■)...Exposure area Figure 1 Figure 3 Figure 4 Figure 5

Claims (3)

[Claims] (1) A pair of light-shielding sorters are installed on the lower surface of the platen glass of the copying machine, and move back and forth in the front-back and left-right directions along the lower surface of the platen glass. 1. An exposure area regulating device for a copying machine, comprising driving means, and regulating an exposure area on a platen glass by moving each light-shielding notebook forward and backward with each driving means. (2) Each light-shielding sheet has a large number of through holes drilled at predetermined bisodge intervals along the longitudinal direction of both side edges, and each driving means has a large number of protrusions that engage with the through holes. The exposure area regulating device for a copying machine according to claim 1, comprising a sprocket having a sprocket and a motor for rotating the sprocket. (3) The scope of the claim that each light-shielding sort is guided by sliding its both side edges within each pair of guide grooves formed on the lower side of both front and rear edges and the lower side of both left and right edges of the platen glass. The exposure range regulating device for a copying machine according to item 1 or 2.