JPS61243440A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent the shadow of indicators which indicate a copying range from being copied on a form carelessly and to mount an original correctly at the arrangement positions of the indicators by providing a transparent original scale to one side part of an original platen and providing the indicators under the scale. CONSTITUTION:The original scale 31 is provided to one side part of the original platen 16 of an electronic copying machine. The original scale 31 is made transparent and its transparent part 32 is provided with graduations 33 for indicating the position where the original is mounted according to original size. Then a couple of indicators 35 which indicate the copying range are provided under the original scale 31 without projecting into a scanning area part. The original is mounted on the original platen 16 according to the indicators 35. For the purpose, the indicators are set under the original scale and outside the scanning area of an exposure system and the original scale is made transparent for seethrough, so no shadow of the indicators is copied on the form and the arrangement positions of the indicators are confirmed clearly even after the original is mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus used, for example, as an electronic copying machine.

[Technical background of the invention and its problems]

Generally, in electronic copying machines, there is a 10th mark on the top of the main body.
As shown in the figure and FIG. 11, a glass document table a is arranged, and a document scale b having eyes @b1 is provided on one side of the document table a. A pair of indicators C, C are attached below. These indicators C, C move along the longitudinal direction of the document scale b in conjunction with the drive source, and move to predetermined scales b1 and 1 of the document scale b.
. . , to indicate the copyable range on the document table a. Based on this instruction, the original is placed on the original platen a against the side edge of the original scale b, and in this state, the exposure system is activated to scan the image of the original and copy it onto the specified paper. It is something to do.

However, in the past, a part of the indicators C1C protrudes from the side edge of the document scale b and faces into the scanning area of the exposure system, and as a result, the shadows of these indicators C0C are reflected on the paper, spoiling its aesthetic appearance. In order to avoid this, move indicators C and C outside document a every time you start copying.
We had to evacuate one by one. - When a document is placed on the document table a, the indicators C and C are obstructed by the document and difficult to see, making it difficult to judge whether the document is placed properly (and furthermore, the indicators Since C and C are arranged so as to protrude from the side edge of the original scale b and are separated from the graduations b1 of the original scale b, there is a problem that visual positional deviation easily occurs between the two.

[Object of the Invention] The present invention has been made with attention to the above-mentioned points, and its purpose is to prevent the shadow of the indicator from being inadvertently cast on the paper, and to prevent the indicator from being placed on the paper. To provide an image forming apparatus in which it is possible to clearly confirm the placement of a document, and there is no visual misalignment between an indicator and the scale of a document scale.

[Summary of the invention]

That is, in the present invention, a document scale is provided on one side of the document table, and an indicator is attached to the document scale that moves in conjunction with a drive source to indicate the copyable range on the document table. A document is placed on a document table based on instructions from the document table, and the image of the document is scanned by illuminating the document with light from an exposure system through the document table. The indicator is disposed at a portion that is removed from the document scale, and the document scale is configured so that the indicator can be seen through.

(Embodiment of the Invention) Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 9.

In the figure, reference numeral 1 denotes a main body of an electronic copying machine, and a photosensitive drum 2 as an image carrier is rotatably provided in the center of the interior of the main body 1. Around the photosensitive drum 2, a charged body 3, a developing device 4, and a transfer charger 5 are arranged in order along the rotation direction of the photosensitive drum 2.
, a peeling charger 6 and a cleaner 7 are provided. At the bottom of one side of the main body 1, paper feed cassettes 869 each containing paper of different sizes are installed in two stages and can be freely inserted and removed. Paper is fed one sheet at a time from .9 onwards. This paper is conveyed along a conveyance path 10, which includes a registration roller 11, the above-mentioned transfer charger 5 and peeling charger 6, a conveyance belt 12, a fixing device 13, and a paper ejection roller 14. are sequentially arranged along the paper conveyance direction, and the paper ejection roller 14
A paper discharge tray 15 for receiving paper is provided ahead of the paper.

A glass document table 16 is arranged at the top of the main body 1, and an exposure system 18 is provided below the document table 16.

It is. The exposure system 18 includes an exposure lamp 19, a first mirror 20, a second mirror 21, a $-th mirror 22, a lens 23, and a fourth mirror 24, and is placed on the upper surface of the document table 16. While moving the exposure lamp 19, the light is applied to the document and reflected to scan the image of the document, and based on this scanning, the image is formed as an electrostatic latent image on the circumferential surface of the photosensitive drum 2. It has become. Note that when the exposure lamp 19 is moved, the second and third mirrors 21 and 22
move in the same direction at a speed of 12, keeping the optical path length constant. The electrostatic latent image on the photosensitive drum 2 is visualized by the toner supplied from the developing device 4, and this visualized image is supplied from the paper feed cassette 8.9 and transferred to paper by the operation of the charger 5. transcribed. Thereafter, the paper is peeled off from the circumferential surface of the photosensitive drum 2 by the operation of the peeler 6, and sent to the fixing device 13 via the conveyor belt 12, where the image is fixed.
The paper is then ejected to the paper ejection tray 15 via the paper ejection row □U14.

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An original N is provided on one side of the original table 16.
' A scale 31 is provided, and this manuscript scale 31
A document is placed on a document table 16 using the side edges of the document as a reference, and is covered with a document cover 30. Manuscript scale 31
Two parts of the transparent part 32 are transparent, and scales 33 are provided on both ends and the area of the transparent part 32 to indicate the position where the document should be placed depending on the size of the document.

An instruction 11 indicating the copyable range below this manuscript scale 31! #I34 is provided. That is, a pair of indicators 35, 35 are provided below the original scale 31, close to and facing the transparent part 32, and not protruding into the scanning area of the exposure system 18. As shown in FIG. 4, these indicators 35 and 35 are attached to an endless wire 37 that is stretched between pulleys 36 and 36, and are moved close to each other or away from each other along the longitudinal direction of the document scale 31. They are moved apart from each other, and the copyable range is indicated by the mutual interval width X.

5 is a shutter mechanism that controls the width of the reflected light from the exposure system 18 and allows only useful light to enter the photosensitive drum 2 when copying is performed by changing the magnification, that is, when changing the magnification.
This shutter mechanism 40 has first and second shutter plates 4
'1.42. Shutter plate 41.4
2 each have racks 43, 44, which mesh with the same pinion 45, and cut edges 46, 47 for cutting reflected light are formed on the shutter plates 41, 42, and these cut edges 46, 47 move toward or away from each other in accordance with the rotation of the pinion 45, and the photosensitive drum 2
It is designed to regulate the width of reflected light that enters the area.

The instruction mechanism 34 and the shutter mechanism 40 are configured to be driven by the same drive source, for example, a pulse motor 50, as shown in FIG. That is, shutter plate 41.42
Pulleys 48.48 are provided on the upper side, and an endless wire 49 is stretched between these pulleys 48.48. And one pulley 3 in the indicating mechanism 34
6 and one of the pulleys 48 in the shutter mechanism 40 are the reduction teeth [! Pulse motor 5 via 51.52
0, and the other pulley 48 in the shutter mechanism 40 is connected to the binion 45 via a reduction gear 53,
As a result, the indicator 35
．． 35 and shirt shirt plates 41 and 42 are adapted to operate simultaneously.

Here, the minimum interval width between the two due to the operation of the indicators 35 and 35 is Xl n1in, and the maximum interval width is Xlma
If X is the maximum stroke width of the indicator 35.35
111aX becomes 'X1a+ax-Xiakin. Further, if the minimum interval width between the cut edges 46.47 accompanying the movement of the shutter plate 41.42 is X2 win and the maximum interval width is X2fflaX, then the shutter plate 41.4
The maximum stroke width 52111aX of 2 is 82 ma
x −82akin. When the indicator 35.35 moves by 81 maX due to the operation of the pulse motor 50, the shutter plate 41.42 moves by 82 max! It is set to operate a×.

The n-light lamp 19 is mounted on a carriage 55 as shown in FIG.
and the carriage 55 is supported on rails 56.56.
It is supported so that it can run freely. A scale plate 57 is provided at the upper end of the carriage 55 to face the document table 16. On the upper surface of the scale plate 57, a reference line 58 along the width direction of the document table 16 and the size of the document are displayed in the same way as the document scale 31. A scale 59 corresponding to . . . is provided.

As shown in FIG. 9, an operation panel 60 is provided on the upper side of the main body 1, and the operation panel 60 includes a variable magnification key 61 for setting the copy magnification, a number key 62 for setting the required number of copies, and A size key 63 for setting the paper size, an operation key 64 for starting copying, and the like are provided.

Therefore, first, in the case of copying at the same size, the length of the paper selected according to the size of the original in the feeding direction is Q,
When L is the distance between the reference line 58 of the scale plate 57 and the side edge of the original scale 31, L=2! (
The carriage 55 is positioned at point a) and the support 35, 35 is positioned at the graduation 33 of the document scale 31 corresponding to the paper size, thereby indicating the copyable range. Then, the original is placed on the original table 16 within this range. At this time, even after placing the original, the indicator 35° 35 can be visually seen through the transparent part 32 of the original scale 31, and the indicator 35
5.35 is placed directly below the scale 33, and there is no visual misalignment between the two. Therefore, it is possible to easily check the placement state of the document and accurately judge whether or not it is appropriate.

When the operation key 64 is operated from this state, the carriage 55 first moves to the side edge of the document scale 31 (point b), and at this position the exposure lamp 19 lights up, and the carriage 55 moves again to point a. By this operation, the image of the original is scanned and copied onto paper.

Here, the indicator 35.35 is placed inside the document scale 31 without facing the scanning area of the exposure system 18, so that the shadow of the indicator 35.35 is not reflected on the paper as in the conventional case. Therefore, the indicator 35
．． Clear and clean copies can always be made on paper without any troublesome and troublesome work such as retracting the paper 35 to the outside of the original. Note that similar operations are repeated when copying images of the same document onto multiple sheets of paper.

On the other hand, in the case of variable-magnification copying, the carriage 55 is controlled to be positioned at a position of L-λ/, where k is the variable-magnification ratio. In addition, due to the relationship between the magnification ratio and the paper size, the indicator 35 is operated by the pulse motor 50.
．． 35 is controlled to be placed at a predetermined position of the scale 33, and then waits.

This indicates the copyable range, and based on this instruction, the original is placed on the original table 16 and the operation key 64 is operated. In response to this, the pulse motor 50 is activated, the indicator 35.35 and the shutter plate 41.42 are moved, and the separation width of the shutter plate 41.42 x 2 is changed, for example, by the magnification ratio or 1 When the maximum original size width is h, k
It is controlled so that xs. In this state, the exposure system 18 is operated to perform copying, and after the copying is completed, the pulse motor 50 is operated again and the indicators 35, .
35 and shutter plates 41 and 42 return to their original positions,
The copyable range is again indicated by the indicator 35.35.

In the above embodiment, a part of the original scale is made transparent, but it goes without saying that there is no problem even if the entire original scale is made transparent.

〔Effect of the invention〕

As explained above, according to the present invention, the indicator is disposed below the original scale and outside the scanning area of the exposure system, and the original scale is configured to be able to see through the indicator. The shadow of the indicator will not be inadvertently cast on the paper when copying, and the placement position of the indicator can be clearly confirmed even after the original is placed. This has the effect that no visual positional deviation occurs between the two.

[Brief explanation of drawings]

1 to 9 show an embodiment of the present invention, in which FIG. 1 is a schematic configuration diagram of an electronic copying machine, FIG. 2 is a perspective view of the main parts, FIG. 3 is a sectional view, and FIG. is a perspective view of the indicating mechanism, 5th
The figure is a perspective view of the shutter mechanism, FIG. 6 is a perspective view showing the drive structure of the indicating mechanism and the shutter mechanism, FIG. 7 is a perspective view showing the arrangement structure of the carriage supporting the exposure lamp, and FIG.
9 is a perspective view showing the external appearance of the electronic copying machine, FIG. 10 is a perspective view showing the prior art, and FIG. 11 is a sectional view. 16... Original table, 18... Exposure system, 31...
Original scale, 36... Indicator, 5o... Pulse motor. Applicant's Representative Patent Attorney Takehiko Suzue Figure 2 Figure 3 Figure 4 Figure 5 Figure 8 Figure 10 Figure 11

Claims (2)

[Claims] (1) A document scale is provided on one side of the document table, and an indicator is attached to this document scale that moves in conjunction with a drive source to indicate the copyable range on the document table. A document is placed on the document table based on the document table, and the image of the document is scanned by exposing the document to light from the exposure system through the document table. An image forming apparatus characterized in that the indicator is disposed in a portion of the image forming apparatus, and the document scale is configured such that the indicator can be seen through the document scale. (2) The image forming apparatus according to claim 1, wherein the drive source of the indicator is a pulse motor.