JPS6186769A - Electrophotographic copying device - Google Patents

Abstract

PURPOSE:To take the copy of a desired portion through simple operations, by reading the position of the desired portion in an original by using coordinates for reading original position and inputting the positional data, then, selectively erasing the electrostatic image formed on an image carrier in accordance with the positional data. CONSTITUTION:At the time of copying, an original 1 is placed with its information written surface upward on a coordinate plate 27 for designating original position by setting the original 1 to a previously fixed reference point M and X and Y coordinate reference lines. Then coordinate scales of two corner points a(Xa, Ya) and b(Xb, Yb) which define a portion G to be copied of the original 1 are read. After reading the coordinate scales, the coordinate values are inputted by operating ten keys 28 of an operating section 31 and after the position of the portion G to be copied is designated, the original 1 is placed on an original placing table 2 with its information written surface downward. When this copying device is operated in the same way as ordinary copying operations thereafter, the erasion controlling signal of an erase lamp 26 is outputted from a control circuit 33 in accordance with the data of the portion G to be copied. Thus unnecessary portions are erased and only a necessary portion is copied.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an electrophotographic copying apparatus that is capable of copying only necessary portions of a document with simple operations.

(b) Prior art Conventionally, when copying a part of a document using an electrophotographic copying device, (a) first copy the entire document, cut out only the part you want to copy from the copy, and copy it again as a document. (b) Copying is done by covering unnecessary parts of the original with blank paper or filling it in white.In addition, recently developed digital copying machines convert the original image information into electrical signals using CCD and make copies. (c) A method is known in which a digitizer is used to specify the part to be copied and only the necessary part of the original is copied by electrical signal processing.

(c) Problems to be solved by the invention The methods (a) and (b) above are extremely troublesome for copying work, and the method (c) allows for accurate specification of the designated mechanism of the copying part. However, in normal copying work, it is not necessary to specify the copied parts with such precision, so digital copying devices have complex device configurations, document information reading mechanisms, circuit configurations for electrical processing, and image forming mechanisms such as lasers. The problem is that it becomes expensive.

(d) Object and structure of the invention The present invention has been made in view of the above points, and an object of the present invention is to provide an electrophotographic copying device that can copy only the necessary portion of a document with simple operation. In order to achieve this, coordinates for reading the document position are provided on the document holding cover, and the coordinates for reading the document position are used to read the position of the part of the document to be copied, and the position data is input.
The electrostatic image of the document formed on the image carrier is selectively erased based on the position data.

(e) Examples The present invention will be explained below based on the drawings.

FIG. 1 schematically shows the internal structure of an electrophotographic copying apparatus according to the present invention, and the illustrated example is a type of copying apparatus in which a scanning optical system for scanning an original is moved. Place original 1 on original table 2
Place the document on top and press it with the document holding cover 3. When the copy button is pressed here, the exposure lamp 4 is turned on and the first mirror unit 5 and second mirror unit 6 move in the direction of the arrow to scan the original 1. Reflected light from the original 1 is guided to a photosensitive drum 9, which is an image carrier, via an imaging lens 7 and a reflecting mirror 8, and is exposed to light. The photoreceptor drum 9 is charged to a certain level by a charger lO before being exposed to light, and when exposed to light reflected from the original 1, the photoreceptor drum 9 is charged with an electrostatic latent corresponding to the original 1. An image is formed. When the photoreceptor drum 9 rotates in the direction of arrow B and the portion on which the electrostatic latent image is formed reaches the development area, toner is supplied from the developing device 11 and a toner image is formed on the surface of the photoreceptor drum 9. be done. This toner image is
Or, the transfer pole 15
The copying machine P, on which the toner image has been transferred, is separated from the photosensitive drum 9 by the separation pole 16 and then sent into the fixing device 18 by the conveyor belt 17. The fixing device 18 is composed of a heating roller 20 having a heater 19 inside and a pressure roller 21.
The toner image is fixed on the copy paper passing between the copy paper 1 and the copy paper by heat and pressure. Thereafter, the copy paper is discharged onto a paper discharge tray 23 by a paper discharge roller 22. On the other hand, after residual charge is removed from the photosensitive drum 9 by the removing electrode 24, the remaining toner is removed by the cleaning device 25, and the photosensitive drum 9 is used for the next copying. An erasing lamp 26 is provided close to the photosensitive drum 9 of this device and between its exposure position and the developing device 11. The erasing lamp 26 is a device for partially erasing the electrostatic latent image formed on the photosensitive drum 9, and is composed of light emitting diodes (Ll!D) arranged in the axial direction of the photosensitive drum 9. In the present invention, the electrostatic latent image on the photosensitive drum 9 is partially erased by controlling the lighting timing and the number of lighting lamps 26.

FIG. 2 is a plan view of the copying apparatus shown in FIG. 1, in which a coordinate plate 27 for specifying the position of an original is pasted on the original holding cover 3. As shown in FIG. As shown enlarged in FIGS. 5 and 6, the coordinate plate 27 has coordinate scales (X coordinate scales and Y coordinate scales) placed at equal intervals on the four sides, and lines are drawn vertically and horizontally at appropriate scale intervals. It's dark.

When the coordinate plate 27 is viewed as shown in FIG. 2, the scanning direction of the optical system is the X-axis, and the direction orthogonal to the scanning direction is the Y-axis. The coordinate origin is determined by the reference position when placing the original on the document table, but in the illustrated example, the coordinate origin is the lower left corner M of the coordinate plate. However, in this embodiment, to specify the position of the portion G of the document to be copied, the document is placed on the coordinate board 27 with the information side facing upward; however, to copy the document thereafter, the document is placed on the document table 2. Since the document is placed with the information side facing down, the document is reversed when specifying the copy position and when copying. For this purpose, the coordinate origin on the document table 2 is the upper left corner, and the coordinate values are determined to increase downward in the Y-axis direction.

In FIG. 2, on the front side of the top panel of the device, an operation section 31 including a numeric keypad 28 for setting the number of copies, a display 29 for the number of copies and the set number of copies, and a copy button 30 is arranged. There is.

FIG. 3 shows an enlarged display of the operation section 31, and shows the numeric keypad 2.
8 has keys from 0 to 9, a mode switching key 28a, and a clear key 28b, and the display 29 has a copy number display 2.
9a and a copy setting number display 29b.

FIG. 4 shows a control block diagram of the copying apparatus according to the present invention.
B. Copy number display 29a5 Copy setting number display 29b
In addition to the above, a drive circuit 32 for the display devices 29m and 29b is provided. 33 is a control circuit that controls the copying process and the turning on and off of the erase lamp based on data on the position of the portion G to be copied entered using the numeric keypad 28 and signals obtained from the copying operation; The normal process drive circuit 35 is an erase lamp drive circuit that turns on and off the erase lamp 26 in response to the on/off period m signal output from the control circuit 33.

When copying, as shown in FIGS. 5 and 6, a predetermined reference point M, an X coordinate reference line, and a Y coordinate reference line are set on the coordinate board 27 for specifying the document position attached to the document holding cover 3. Place the original 1 with the information side facing up. In this state, two corner points a (X,, y,) and b (Xs, Yb
), in the example of Figure 6, read the coordinate scale of point 1
, -6,Y.

-4, point b chive &'i'Xb -11, Yb -10.

Next, the numeric keypad 28 of the operation unit 31 is operated in the following order to input the coordinate values read above. Here, P refers to the mode switching key 28a, and by pressing this key, the mode is switched to the document position designation mode.

P→6-4P→4→P→1l-P-410→P The input coordinate values are sent to the copy number display 29a and copy setting number display 29b via the display drive circuit 32 based on a signal from the control circuit 33. You can confirm this by sequentially displaying the values, and when the mode switching key 28m ("P") is finally pressed after the input, the document position designation mode is canceled and the display on the displays 29a and 29b returns to 00. Note that when the document position designation mode is canceled, the display may be returned to the value before the document position designation mode was entered.

After specifying the position of the portion G to be copied in this way, lift the document holding cover 3 and place the document L on the document table 2 with the information side facing downward.After that, operate the operation section 31 in the same way as in normal copying operations. Copy button 30 (see Figure 3)
When you press , the photoreceptor drum 9 rotates and the first. The scanning optical system including the second mirror unit begins to move. At this time, the control circuit 33 sends an erase lamp 26 to
The on/off control signal is output, but as mentioned above, the coordinate origin on the document table is the upper left corner, and the document information is reversed vertically and horizontally via the scanning optical system, and then transferred back onto the photoreceptor drum. An electrostatic latent image is formed with the coordinate origin at the lower left corner (this is just the same as placing a document with the information side facing upward on the document holding cover).

As shown in FIG. 7, there are a plurality of erase lamps 26 (n pieces).
It is composed of segment lamps (for example, LEDs) L1 to L, and the number of segment lamps is the same as the coordinate plate 2.
This corresponds to the number of Y coordinate scales of 7. Therefore, Y coordinate value Y
1. Yb, -------Yll correspond to the segment lamps Ll, Lz, '--L, respectively. However, this is not an essential condition, and therefore, as shown in FIG.
This will be explained using figures.

As shown in FIG. 8, segment lamps L, ~L, middle segment lamps L1~Ls, and Lll~L remain lit during the copying cycle, and segment lamps L, ~L
1. is the period t during the copy cycle.

and t are lit, and are turned off during period t. As a result, the electrostatic latent image on the photosensitive drum corresponding to the portion G to be copied is retained, and the electrostatic latent image on other portions is erased and fixed by normal electrophotographic processing and remains on the transfer paper.

A copying cycle in which the position of the part of the original to be copied can be read by placing the next original on the coordinate plate during the copying cycle of one original, without affecting the copying operation currently in progress. Since the document holding cover is closed inside, the coordinate board provided on the top surface of this cover can be used for editing purposes.The present invention allows inputting not only the same size copy but also the enlargement and reduction magnification. It can be applied by converting the coordinate values in association with the copying magnification.

(F) As described in detail, the present invention provides coordinates for reading the document position on the document holding cover, and uses the coordinates for reading the document position to read the position of the portion of the document to be copied. The configuration is such that the position data is input using the image carrier, and the electrostatic image of the document formed on the image carrier is selectively erased based on the position data, so the document can be placed on the document holding cover before copying. The desired part can be copied by a simple operation of reading the position of the part to be copied and inputting the position data, and the operation is extremely simple, and the electrical processing circuit for this purpose is not very complicated.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of an electrophotographic copying apparatus according to the present invention;
2 is a plan view of the electrophotographic copying device shown in FIG. 1, FIG. 3 is an enlarged view of the operation section of the electrophotographic copying device shown in FIG. 2, and FIG. 4 is a plan view of the electrophotographic copying device according to the present invention. 5 is a diagram illustrating the reading of the document position according to the present invention, FIG. 6 is a partially enlarged view of FIG. 5, and FIG. 7 is a diagram showing the document position and the erase lamp. FIG. 8 is a time chart showing the timing of turning on and off the erase lamp. 1... Original, 2... Original table, 3... Original holding cover, 4... Exposure lamp, 9... Photosensitive drum, 1o
...Charger, 11...Developing device, 26...Erasing lamp, 27...Coordinate board, 2 B...Numeric keypad, 2
9... Copy number and copy setting number display, 30...
・Copy button, 31...Operation unit, 33...Control circuit, 34...Process drive circuit, 35...Erase lamp drive circuit Patent applicant Hiroshi Suzuki, agent of Konishiroku Photo Industry Co., Ltd., patent attorney Younger brother 1 Figure 2 Figure J13 Figure 4 FA Figure 5 Figure 6 jg 7 Figure 8 (on the X-axis)

Claims (1)

[Claims] Coordinates for reading the document position provided on the document holding cover,
a copying position input means for inputting data on the position of a portion of the original to be copied read using the coordinates for reading the original position; and a copying position input means for inputting data on the position of a portion to be copied in the original read by the coordinates for reading the original position, and selectively copying the electrostatic latent image formed on the image carrier based on the position data. An electrophotographic copying apparatus comprising an electrostatic image erasing means for erasing an electrostatic image.