JPS61238037A - Image forming device - Google Patents

Abstract

PURPOSE:To grasp the image formation area of an original clearly by moving a projecting means with an area specifying signal by the quantity of image formation determined by magnification and form size before copying operation and turning it on for display. CONSTITUTION:The image formation specifying signal is generated before copying according to paper size 51 and a magnification signal 52 and this signal is read in a CPU 46 to calculate a copying area. For example, when a form is 364mm and the magnification is X 1.3, a copy can be taken up to 280mm and a motor 37 is driven corresponding to the number of pulses based upon said distance. Therefore, a lamp 31 for irradiation moves by l=280mm and a pilot lamp 45 illuminates, so this range is compared with the original to grasp the copy range of the original. Consequently, a necessary part of the original is prevented from failing to be copied and a blank part is also prevented from becoming large.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] "Industrial Application Field" The present invention relates to a means for clearly displaying an image forming area on a document table to a user.

"Problems to be Solved by the Prior Art and the Invention" Many of the recent image forming apparatuses have been equipped with so-called magnification means for obtaining an enlarged or reduced reproduced image of a document, and there are some devices that are not particularly effective. More and more devices are capable of changing magnification in stages. Particularly in this case, it is difficult to know which area of the document will be formed as an image, which tends to cause problems such as necessary parts of the document being missing or blank spaces becoming unnecessarily large.

In order to reliably form an image on the required area of a document, there are two methods: selecting an appropriate size of the final image carrier on which the image will be formed, or selecting an appropriate image forming magnification. It is used differently depending on the purpose of use.

In either case, it is necessary to clearly display the area on which the image of the document is to be formed.

Currently, as a method of displaying the image forming area of the above-mentioned original, a plurality of light emitters 3 are provided on the edge glass holding frame of the original glass l as shown in Figure 7, and the light emitters 3 at the edges of the image forming area emit light. There are things you can do by letting someone do something. However, in this method, there is a problem that the area cannot be clearly seen because the area is not displayed directly on the original glass l.

Furthermore, in a machine capable of steplessly changing the magnification, there is a problem in that it is necessary to provide a very large number of light emitters 3.

Another method is to provide an indicator means fixed to parallel wires driven by a pulse motor S as shown in Figure S at the bottom of the original glass l, and select this indicator means. The area is displayed by driving the pulse motor 5 and moving it to a position calculated based on the magnification and the final image carrier. - According to this method, the area is clearly displayed, but for this purpose, a special indexing means is provided, a means for driving it (in the figure, a pulse motor), and a means for transmitting the drive (in the figure, a wire 6 and this This requires a means (a photo interrupter in the figure) for detecting the position of the index (a pulley wrapped around a

SUMMARY OF THE INVENTION An object of the present invention is to provide a means for displaying an image forming area in an image forming apparatus by using a document support means and a projection means without requiring any special means.

[Structure of the invention]

"Means for Solving the Problems" The present invention provides an apparatus that includes an original supporting means and an original projecting means and performs image formation by moving the projecting means or the original supporting means. By providing a means for moving and stopping the projection means or document supporting means from the image forming leading edge position of the document by the image forming area designation signal to a position moved in the scanning direction by the image forming area designation signal, the image forming area can be extended by the image forming area designation signal. An image forming apparatus is characterized in that recognition is possible based on the relative positions of a document projection device and a document support device.

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

FIG. 1 is a front sectional view of an electrostatic copying machine (hereinafter referred to as a copying machine) shown as an example of an image forming apparatus.

During copying, the illumination device /θ and the reflection mirror /l move in the right direction of the arrow shown in the figure, and the illumination device 10 illuminates the original O, which is held down by the original pressure plate 91 on the original platen as an original support means. The original image is reflected on the reflection mirror/
1, and the illumination device 10 and the reflecting mirror moving in the same direction at -half the speed of the reflecting mirror ii./2. /3
It is reflected by the imaging lens/da and passes through the fixed mirror/!
.

A charger/9 is arranged upstream of the image forming position of the photoreceptor drum/1, and a developing device -〇, a transfer electrode, 2/, a separating means -1, and a cleaning device λ3 are arranged downstream of the image forming position of the photoreceptor drum/l. The transfer paper P, which is the final image carrier, is transferred from the paper storage table 241-/, λDarko to the paper feed roller 2! -/, 5-1 is rotated to selectively send the toner out, and is further conveyed in synchronization with the toner image on the photoreceptor drum 11 by the roller pair 6ζ, and after image transfer, the toner image is transferred to the conveying device core. , a fixing device S, and an ejecting device T, a copy image is stored on the ejecting tray 30. On the other hand, after the photosensitive drum IT transfers the toner image onto the transfer paper P, the cleaning device 3
The remaining toner is removed. The fan is used to prevent the temperature of the optical system from rising.

1, 3, and 3 are diagrams showing the main parts of the document projection means shown in FIG. 1. The lighting device 10 is a lamp 3
1 and a reflective shade J, and is fixed on a support JJ that supports a mirror//8. The support body 3J has one end movably supported by the guide member 3da, and is connected to the drive wire J6 by a fixture 3j.

The other end of the support body 3J is movably guided on a guide member parallel to the guide member 3DA which is not subjected to water melting.

The wire 36 is connected to the boot IJ attached to the drive motor J.
, 7 t, and the end is connected to a pulley 39 and a movable mirror (not shown). /, is fixed to the main body via the pulley of the support body 1.

The drive motor 3 is a motor whose speed can be controlled to enable stepless magnification, and what is currently most commonly used is a pulse motor or a DO motor equipped with a pulse generator. The example in Figure 1 is the latter example, and the pulse disk 3? −
J and pulse detection sensor J Ku 3 are attached. Illumination device IO and reflective mirror/l support JJ
A sensing piece, 77t) is provided protruding from a part of the sensor aO, which detects the passage of this sensing piece, 7.71).
and da l are placed. Here, the sensor 4LO detects the position where the support 3J8 is stopped, and the sensor a
t detects the time when the scanning means passes the leading edge of the document.

The optical system of the copying machine has a sensitive plate when not in use after the previous copying.
jt) is stopped at the origin position that coincides with sensor '10, so that the optical system is located at the position shown in FIG. When the user specifies the copy magnification and copy paper size on the operation panel, a paper size signal is output as shown in Figure 6! l and the magnification signal (together referred to as the image formation designation signal) are input ports. The microcomputer 6 displays the magnification paper size, etc. from the output port 04 through the driver ay, and at the same time, for example, if the length of the copy paper of the same size as the original is 36 g, the magnification In the case of 3 times JAII/i, 3=-Iollm is the copyable range on the original document, and the microcomputer at that performed this calculation as the number of pulses of the drive motor 3 has an output port of 0.
The drive motor 3 is driven from the drive motor 3 via the driver at.

The drive motor 37 rotates the booleans IJ and 7g and sends the drive wire 36 in the direction of the arrow shown, so that the support JJ and the illumination device IO both move in the same direction.

At the same time, pulse disk 37-ko and pulse detection sensor J-koo 3
A motor clock pulse generated by the action of is inputted to the microcomputer 6 from the input port 6. And the sensing piece JJ'eJ is the document front direction detection sensor/
When the motor is operated, its signal is input to the microcomputer 4c6 through the input port I, and the clock pulses of the motor begin to be counted. The feed amount of the illumination device 10 determined by the copying magnification signal and the paper size signal xi (described in 1 below).
The number of motor clock pulses corresponding to (corrected) is already stored in the microcomputer 1, and when the number of motor clock pulses counted after the sensor 41/ detects the leading edge of the document is reached,
outputs an L level signal from the output port Q1, deenergizes the driver adapter 7, and stops the drive motor 3. In the embodiment shown in FIG. 5, which will be explained later, when the drive motor 3 is stopped, the output port 01 of the microcomputer is
#ol is output, the rotation drive solenoid is energized via the driver lI7, and the display board rotates around the fulcrum, so that the end surface of the display board is aligned with the original as shown in Figure 3. When approaching the mounting table 9, the area display lamp S lights up to clarify the position of the display board. As a result, the end 32+1 of the reflective shade or the display board 11 stops at the end of the copyable area. The distance between the edge jJ' of the reflective shade or the leading edge of the document is the copyable area -IOWIA, which is determined from the already calculated copying magnification and paper size.

This allows the user to clearly know the copyable area by recognizing the position of the optical system through the glass of the original table 9. That is, the copyable area is looked at and compared with the image area of the original aO. While looking at the image area of document 0, change the magnification signal j- by changing the magnification designation on the operation panel of the copying machine. 2 is input to the microcomputer 4I through the input port, and the counted clock pulses indicating the current position of the drive motor stored in the microcomputer 4 and the copyable area corresponding to the changed magnification designation are input to the microcomputer 4I through the input port. Compare the clock pulse and drive the drive motor 3 to move the end J of the reflective shade.
J' or the display board 41- is moved to the end of the copyable area according to the designated magnification. In the case of this change in magnification, it is easier to see if the display panel II and area display lamp j are left in their operating states in the example shown in FIG.

When the copy start button is pressed, the drive motor J'l reverses, and at the same time, in the example of FIG.
It rotates around and falls down. In this way, the support 3J goes back, and the signal detected by the origin sensor 0 for the support JJ is inputted to the microcomputer 414 from the output port Os to the driver 4. !7, the drive motor 3 is rotated in the normal direction, and at the same time, the lamp J/ of the illumination device is turned on, and the copying process is carried out as already described. In this case, the scanning limit is the previously recognized length of the copyable area iζ, and the illumination device io and the like move backward from that position. When the required number of copies have been made by repeating copying in this manner, the sensitive piece 33) operates the sensor 0 at the origin, and this signal causes the microcomputer 4 to be driven by the drive motor j?
, the pulley at stops, the wire J6 stops moving, the support body 33 stops, and the illumination device io stops at the original position.

In the embodiment, the copyable range is determined by copying magnification and paper specification, but it goes without saying that the same effect can be applied to a copying machine in which the copyable range to be copied is determined simply by inputting from the operation section.

In order to improve the stop tank j[ in the above-mentioned case 1, in the case of a Do motor, it is possible to use known electric braking means (for example, short-circuiting, etc.). Furthermore, even if a pulse motor is used, it is possible to move and stop the optical system at a predetermined position in substantially the same manner.

Furthermore, in order to clearly display the end of the area to the user, it is preferable to carry out ζζ by painting a member close to the glass top surface of the original table in a bright color.

Figure 3 shows an example of this, in which three ends of three reflective shades of an illumination lamp J/ are painted in a bright color (yellow or white). In this case, the scanning center A and the end B of the reflective shade are not in the same position, and a distance J occurs, so in this case, this 1
It is necessary to stop the optical system at a position corrected by
This correction can also be easily performed by the microcomputer 6 (FIG. 1).

FIG. 3 shows another embodiment, in which a dedicated position display means is provided on the support JJ to make the display clear. In the embodiment shown in Fig. 5, is the original i mounting table? In order to provide a display member that is very close to the bottom surface of the glass, it is kept away from the bottom surface of the glass during normal exposure scanning to avoid contact with the original glass, etc., and is placed close to the glass only when displaying an area. This is an example in which a movable member is provided. In the example of FIG. 3, the display board 4 extends in the front and back direction of the copying machine! This is rotatably supported by a fulcrum 41J, and connected to a rotary drive solenoid. When displaying the area, the rotary drive solenoid aa is energized so that it is at the position shown by the solid line in the figure, making it possible to display at a position close to the bottom surface of the glass, and when moving, the rotary drive solenoid aa is deenergized. Accordingly, a spring built into a rotary drive solenoid 4Ia (not shown) is used to tilt the display board to the dotted line position in the figure to ensure safe movement. In the example shown in Fig. 3, the display board e is used as a transparent light-transmitting means, including an example in which an area display lamp is placed at the end of the display board 4 (-) to further clarify the display of the area. In this case as well, it is necessary to correct the distance shown in the concession diagram.

The above description is for a copying machine with a moving optical system, but in a copying machine with a moving document table and a fixed optical system, a display board placed at or near the end of the reflective shade of the illumination device can be used to move the document table. The copyable range can be recognized as the amount of movement.

In the embodiment, only the scanning direction can be displayed as the area range, but the direction perpendicular to the scanning direction can be displayed by conventionally known means.

In the embodiment, the illumination device and the reflecting mirror // are integrally supported and a display section is provided thereon, but even if each is supported separately, a display section may be provided on either one of them. In this way, the same effect as above can be achieved.

〔Effect of the invention〕

The present invention provides an apparatus comprising an original supporting means and an original projecting means, in which an image is formed by moving the projecting means or the original supporting means, wherein the projecting means Alternatively, by providing a means for moving and stopping the document supporting means from the image forming leading edge position of the document to a position moved in the scanning direction by the image forming possible length, the distance between the document projecting means and the document supporting means is increased by the image forming possible length. Since the image forming apparatus is characterized in that it can be recognized by position, it has the effect of making it possible to clearly indicate the image forming area by a simple means.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of an electronic copying machine according to an embodiment of the present invention, FIG. 1 is a perspective view showing a part of the document projection means in FIG.
The figure is a partially enlarged view of Figure 1, and the lower figure is a perspective view of the lighting device.
FIG. S is a side view of another embodiment, FIG. #g6 is a block diagram showing the control device, and FIGS. 7 and 8 are perspective views of the conventional example. t...Original table lO...Illumination system flly...Edge of urn reflective shade 4Il--Display board.

Claims (1)

[Claims] 1. In an apparatus that includes an original supporting means and an original projecting means and performs image formation by moving the projecting means or the original supporting means, the projection means or original is By providing a means for moving and stopping the supporting means from the image forming leading edge position of the original in the scanning direction by the image forming possible length, the image forming area can be recognized by the relative position of the original projecting means and the original supporting means. An image forming apparatus characterized in that: