JPH077182B2 - Image forming device - Google Patents

Description

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

"Problems to be Solved by Conventional Techniques and Inventions" Many of the recent image forming apparatuses have come to have so-called variable magnification means for obtaining a magnified or reduced reproduced image of an original, and there is no particular need. There are many devices that can change the magnification in stages. In particular, in this case, it is not easy to know which area of the document is to be formed as an image, and there arises a problem that a necessary part of the document is missing or a margin is unnecessarily enlarged.

In order to surely form an image in a required area of a document, there is a method of selecting an appropriate size of a final image carrier on which an image is formed, or an appropriate image forming magnification. It is used properly according to the purpose of use.

In any case, it is necessary to clearly display the area where the image of the document is formed.

As a method of displaying the image forming area of the original document, a plurality of light emitters 3 are provided on the edge glass holding frame 2 of the original glass 1 as shown in FIG. 7, and the light emitter 3 at the edge of the image forming area is made to emit light. There are things to do. However, in the case of this method, there is a problem that the area cannot be clearly identified because the area is not directly displayed on the original glass 1. Further, in a machine capable of continuously changing the magnification, there is a problem that it is necessary to provide a very large number of light emitters 3.

As another method, the indexing means 4 fixed to the parallel wires 6 driven by the pulse motor 5 as shown in FIG.
The area is displayed by driving the pulse motor 5 to a position calculated by the selected magnification and the final image carrier. According to this method, the area is clearly displayed, but for this purpose, a special indexing means 4 and means for driving it (pulse motor 5 in the figure) and means for transmitting the drive (wire 6 and this in the figure) are used. A means for detecting the position of the wound pulley) index (the photo interrupter 7 in the figure) is required, which leads to the complexity of the mechanism and the enlargement of the device.

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

[Structure of Invention]

"Means for Solving Problems" The present invention relates to a document table, a light source that illuminates a document placed on the document table, a support that supports the light source and moves in the document scanning direction, and a support. The recording material includes a mirror that reflects the light that is supported and reflects the light obtained from the original, a size designating means for designating the size of the recording material, and a magnification designating means for designating the copy magnification to the recording material. In an image forming apparatus for forming an image according to an original image, a display unit provided integrally with the support and parallel to the light source for indicating a copyable range of the original, and a recording material designated by the size designating means. Calculation means for calculating the copyable range on the platen based on the size and the magnification specified by the magnification specifying means, and the display unit is stopped at the end of the copyable range calculated by the calculation means in the original scanning direction. On the copyable range display The control means for moving the supporting member and the supporting means for scanning the original by the distance between the mirror and the display so that the display moves to a position different from the stop position of the copyable range display during the original scanning. An image forming apparatus comprising: a correction unit that corrects a moving distance.

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

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 illuminating device 10 and the reflecting mirror 11 move to the right of the arrow in the figure, and the illuminating device 10 irradiates the original 0 pressed by the original pressure plate 49 on the original table 9 serving as the original supporting means, The original image is reflected and changes its direction by the reflecting mirror 11, and is reflected by the illuminating device 10 and the reflecting mirrors 12 and 13 which move in the same direction at half the speed of the reflecting mirror 11 and passes through the imaging lens 14. The light is sequentially reflected by the fixed mirrors 15, 16 and 17, a photoconductive insulator is provided on the outer periphery, and an image is formed on the photosensitive drum 18 which rotates in the direction of the arrow in the figure in synchronization with the optical scanning.

The charger 19 is arranged upstream of the image forming position of the photosensitive drum 18, and the developing device 20, the transfer electrode 21, the separating means 22, and the cleaning device 23 are arranged downstream of the image forming position of the photosensitive drum 18, thereby charging and exposing. Then, the transfer paper P which has been developed and is the final image carrier is transferred from the paper storage trays 24-1 and 24-2 to the paper feed roller 25-.
When either one of 1, 25-2 is rotated, it is selectively sent out, and by the roller pair 26, the photosensitive drum 18
After the image is transferred, it is transported in synchronism with the toner image on the transport device 2
7, a fixing device 28, and a discharging device 29 are used to store a copy image formed on the discharging tray 30. On the other hand, after the toner image is transferred onto the transfer sheet P, the cleaning device 23 removes the residual toner from the photosensitive drum 18. Reference numeral 48 is a fan for preventing the temperature rise of the optical system.

FIGS. 2, 3, and 4 are diagrams showing the main part of the document projection means shown in FIG. The illuminating device 10 includes a lamp 31 and a reflective shade 32, and is fixed on a support 33 that supports the mirror 11. One end of the support 33 is movably supported by the guide member 34, and is connected to the drive wire 36 by a fixing fitting 35. The other end of the support 33 is adapted to be guided on a guide member (not shown) parallel to the guide member 34.

The wire 36 is wound around a pulley 38 attached to a drive motor 37, and an end of the wire 36 is fixed to the main body via a pulley 39 and a pulley of a supporting body of the moving mirrors 12 and 13 (not shown).

The drive motor 37 is a speed controllable motor that enables stepless variable magnification, and a pulse motor or a DC motor equipped with a pulse generator is often used at present.
The example of FIG. 2 is the latter example, in which the pulse disk 37-2 and the pulse detection sensor 37-3 are attached.
A sensing piece 33b is provided so as to project from a part of the support 33 of the illuminating device 10 and the reflection mirror 11, and sensors 40 and 41 for detecting passage of the sensing piece 33b are arranged. Sensor here
40 is for detecting the position where the support 33 is stopped,
The sensor 41 detects the time when the scanning means passes the leading edge of the document.

The optical system of the copier is a sensitive piece 33 when not in use after the previous copying.
The optical system is located at the position shown in FIG. 1 by stopping at the origin position where b coincides with the sensor 40. When the user specifies the copy magnification and copy paper size with the operation unit, a paper size signal 51 and a magnification signal 52 (collectively referred to as an image forming designation signal) are input through the input port I ₄ to the micro computer 46 as shown in FIG. Is read by the microcomputer 46 from the output port O ₄ via the driver 47 to display the magnification paper size etc. 5
3 at the same time, for example, if the length of copy paper of the same size as the original is 364 mm and the magnification is 1.3 times, the copyable range on the original is 364 / 1.3 = 280 mm, and this calculation is used as the number of pulses of the drive motor 37. The microcomputer 46 thus driven drives the drive motor 37 from the output port O ₁ through the driver 47. The drive motor 37 rotates the pulley 38 and sends the drive wire 36 in the direction of the arrow shown in the figure, so that both the support 33 and the lighting device 10 move in the same direction. At the same time, the motor clock pulse generated by the action of the pulse disk 37-2 and the pulse detection sensor 37-3 is input to the microcomputer 46 from the input port I ₃ . When the sensitive piece 33b operates the document leading edge detecting sensor 41, the signal is input to the microcomputer 46 through the input port I _{2 and} the clock pulse of the motor starts counting. It is already stored in the microcomputer 46 as a clock pulse of the motor corresponding to the feed amount of the illuminating device 10 (corrected later, which is determined by the magnification signal 52 for copying and the paper size signal 51), and the front end of the document is detected by the sensor 41. When the number of counted motor clock pulses is reached after the detection, the microcomputer 46 outputs an L level signal from the output port O ₁ to deactivate the driver 47 and stop the drive motor 37. In the embodiment shown in FIG. 5, which will be described later, the output ports O ₂ and _{3 of the} microcomputer are output at the same time when the drive motor 37 is stopped, and the rotary drive solenoid 44 is energized via the driver 47. , Display board
42 rotates about a fulcrum 43 so that the end surface of the display plate 42 approaches the document table 9 and the area display lamp 45 as shown in FIG.
Lights up to clarify the position of the display plate 42. As a result, the end 32 ¹ of the reflection shade or the display plate 42 is stopped at the end of the copyable area. The distance between the edge 32 ^{1 of the} reflection shade or the display plate 42 and the leading edge of the original is a copyable area 280 mm determined by the already calculated copy magnification and paper size.

Here, the user can clearly know the copyable area by recognizing the position of the optical system through the glass of the document table 9. That is, the copyable area is viewed and compared with the image area of the original 0. Looking at the image area of the manuscript 0 at this point, if the magnification designation of the operation section of the copying machine is changed and the magnification signal 52 is changed, the magnification signal 52 is input to the microcomputer 46 through the input port I ₄ , and the microcomputer 46. The counted clock pulse indicating the current position of the drive motor 37 stored in the table is compared with the clock pulse corresponding to the copyable area designated by the changed magnification,
The drive motor 37 is driven to move the end 32 ^{1 of the} reflection shade or the display plate 42 to the end of the copyable area according to the designated magnification. In the case of this magnification change, in the example of FIG. 5, it is easier to see the display plate 42 and the area display lamp 45 as they are.

When the copy start button is pressed, the drive motor 37 reversely rotates, and at the same time, in the example of FIG. 5, the rotary drive solenoid 44 and the area display lamp 45 are deenergized, and the display plate 42 pivots about the fulcrum 43 and falls down. Thus, the support 33 goes back and the sensitive piece 33b is attached to the support 33.
The signal detected by the stop origin sensor 40 is input to the microcomputer 46 through the input port I ₁ , and the microcomputer 46 causes the drive motor 37 to rotate forward from the output port O ₁ via the driver 47, and at the same time, the lamp 31 of the lighting device. Lights up and the copying process is carried out as described above. In this case, the limit of scanning is the length limited to the previously recognized copyable area, and the illuminating device 10 and the like return from that position. In this way, when the required number of sheets are copied by repeating the copying, the sensitive piece 33b operates the sensor 40 at the origin, and this signal causes the micro-computer 46 to drive the driving motor 37 and the pulley.
38 stops, the wire 36 stops moving, the support 33 stops, and the lighting device 10 stops at the origin position.

In the embodiment, the copyable range is determined by the copy magnification and the paper designation, but it goes without saying that the same effect can be obtained in a copying machine in which the copyable range desired to be copied is simply determined by the input of the operation unit.

In the above case, in order to improve the stopping accuracy, in the case of a DC motor, it is possible to carry out by known electric braking means (for example, a shout or the like). Also in the pulse motor, it is possible to stop the movement of the optical system to a predetermined position in substantially the same manner.

Further, in order to display the area edge easily for the user, it is preferable to apply a bright color to a member close to the glass upper surface of the document placing table.

FIG. 4 shows an example thereof, in which the end 32 ¹ of the reflection shade 32 of the illumination lamp 31 is painted in a bright color (yellow or white). In this case, the position of the scanning center A is not the same as the position of the end B of the reflection shade, and a distance l is generated. In this case, therefore, it is necessary to stop the optical system at a position corrected by this l, and this correction is also performed by the micro computer. This can be easily done by using 46 (Fig. 6).

FIG. 5 shows another embodiment, in which a dedicated position display means is provided on the support 33 to make the display clear. In the embodiment shown in FIG. 5, the display member is provided closer to the lower surface of the glass of the original placing table 9, so that it is kept away from the lower surface of the glass in order to avoid contact with the glass or the like during normal exposure scanning, and the area display is performed. This is an example in which a movable member is provided so as to be close to the glass only at times. In the example of FIG. 5, a display plate 42 extending in the front-rear direction of the copying machine is rotatably supported by a fulcrum 43, and is connected to a rotary drive solenoid 44. When the area is displayed, the rotary drive solenoid is set so that it is at the solid line position in the figure.
It is possible to display at a position close to the lower surface of the glass by energizing 44, and by deactivating the rotary drive solenoid 44 during movement, a spring built in the rotary drive solenoid 44 (not shown) is used. The display plate 42 is tilted to the position indicated by the dotted line in the figure to ensure the safety of movement. In the example of FIG. 5, the display plate 42 is used as a transparent light transmitting means, and an area display lamp 45 is arranged at the end of the display plate 42 to further clarify the display of the area. Also in this case, it is necessary to correct the distance shown in FIG.

The above is a description of a copying machine equipped with a moving optical system, but in the case of a copying machine in which the optical system is fixed by moving the original placing table, similarly, the original placing table of the original placing table is set by the display plate arranged at the end of the reflection shade of the illuminating device or in the vicinity thereof. The copyable range can be recognized as the movement amount.

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

In the embodiment, the illuminating device and the reflection mirror 11 are integrally supported and the display unit is provided, but even when each is separately supported, by providing the display unit on either one of them. The same effect as above can be exhibited.

〔The invention's effect〕

According to the present invention, a document table, a light source that illuminates a document placed on the document table, a support that supports the light source and moves in the document scanning direction, and a light that is supported by the support and that is obtained from the document are reflected. An image that has a mirror, a size designating unit for designating the size of the recording material, and a magnification designating unit for designating the copy magnification to the recording material, and forms an image according to the original image on the recording material. In the forming apparatus, a display unit that is provided integrally with the support and is parallel to the light source for indicating the copyable range of the original, the recording material size designated by the size designating unit, and the magnification designating unit are designated. Calculation means for calculating the copyable range on the platen based on the magnification, and the support on the copyable range display part so that the display part stops at the end of the copyable range calculated by the calculation part in the document scanning direction. Control means to move the body Correction means for correcting the moving distance of the supporting means at the time of scanning the original by the distance between the mirror and the display so that the display moves to a position different from the stop position of the copyable range display during scanning of the original. Since the copyable range on the platen can be clearly displayed to the operator by a simple method, the correction unit does not move the support to an unnecessary position during scanning of the document. This has the effect of shortening the scanning time.

[Brief description of drawings]

1 is a side sectional view of an electronic copying machine according to an embodiment of the present invention, FIG. 2 is a perspective view showing a part of the document projection means of FIG. 1, and FIG.
1 is a partially enlarged view of FIG. 1, FIG. 4 is a perspective view of a lighting device,
FIG. 5 is a side view of another embodiment, FIG. 6 is a block diagram showing a control device, and FIGS. 7 and 8 are perspective views of a conventional example. 9 ... Original platen, 10 ... Illumination device, 32 ¹ ... Edge of reflector, 41
... display board.

Claims (1)

[Claims] 1. A document table, a light source that illuminates a document placed on the document table, a support that supports the light source and moves in the document scanning direction, and a light source supported by the support and obtained from the document. An image corresponding to an original image is formed on the recording material by having a reflecting mirror, a size designating means for designating the size of the recording material, and a magnification designating means for designating a copy magnification to the recording material. In the image forming apparatus, a display unit provided integrally with the support and parallel to the light source for indicating a copyable range of an original, a recording material size designated by the size designating unit, and a scaling factor designating unit are designated. Calculating means for calculating the copyable range on the platen based on the calculated magnification, and the above-mentioned display mode when the copyable range is displayed so that the display unit stops at the end of the copyable range calculated by the calculating means in the original scanning direction. Control to move the support Means and a correction means for correcting the moving distance of the supporting means at the time of scanning the original by the distance between the mirror and the display so that the display moves to a position different from the stop position when the copyable range is displayed at the time of scanning the original. An image forming apparatus comprising: