JPS63127233A - Copy density controller - Google Patents

Abstract

PURPOSE:To efficiently set the density at the time of copying a board written part by invalidating the other density setting means when one of plural density setting means is selected. CONSTITUTION:When a sheet of paper is normally supplied, a board part 1 rotates the sheet 7 to send a resist timing signal. A copying part 2 drives a resist roll 24 by this signal to carry a copy paper. If a standard density set button 6-1 on the board part 1 is depressed, the board part 1 outputs a standard density signal. The copying part 2 drives a bias value switching circuit to switch the bias value to the standard density bias value. After exposure of the sheet 7 is terminated, a fluorescent lamp 33 on the board part 1 is extinguished by the end signal and the board part 1 is set to the stand-by mode, and the copy part 2 is set to the stand-by mode after the rotation routine.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a copy density control device.

[Prior Art] In recent years, electronic blackboards have been developed that can be used not only for blackboard copying but also for normal original copying. In such a device, the copy density is adjusted not by the blackboard but by a density adjustment means provided on the copying machine.

[Problems to be Solved by the Invention] However, when copying from a blackboard, the background level of the blackboard portion is constant, so it is very troublesome to set the density each time using the density adjustment means of the copying machine.

[Means and effects for solving the problem] According to the present invention, by having a first density setting means for copying at a constant density and a second density setting means for copying at an arbitrary density. , which solves the trouble of setting the density when copying a blackboard part.

(Example) FIG. 1 is an external view of an example of the present invention. 1 in the diagram
2 is the main body of the blackboard section (hereinafter referred to as the board), 2 is the main body of the copying machine,
Reference numeral 3 denotes a stand on which the copying machine 2 is placed, a part of which is supported by legs 4, and can swing around the legs 4;
It has a structure that allows it to move horizontally with respect to the ground.

Reference numeral 5 is an auxiliary leg fixed to the table 3 and is movable together with the table 3. Reference numeral 6 designates an operating section when the copying machine is in electronic blackboard mode, 7 a belt-like sheet on which writing is possible, 8 an auxiliary pipe for the leg section 4, and 10 an operating section when the copying machine is used alone.

FIG. 2 is an internal structural diagram of the main body of the copying machine. Reference numeral 11 denotes a document table on which a document is placed during normal copying, and is composed of a document table cover 11-1 and a document table glass 11-2, and moves from side to side in the figure.

Reference numeral 13 denotes an illumination lamp for pre-exposure to erase residual charges on the photosensitive drum 12, blank exposure by reflecting off the blank exposure shutter 25, and image exposure for illuminating the document in copying machine mode.

Note that the blank exposure shutter 25 is opened and closed by the movement of the document table 11. 14 is a primary charger, 15 is a developing device, 16 is a transfer charger, 17 is a fixing device, 18 is a drum cleaning device, 19 is a paper feed roller, 20 is a paper ejection roller, and 22 is a paper ejection lever 21 that emits light. A photointerrupter that detects paper ejection by blocking and transmitting light. 23 is a lens (trade name: SELFOC Lens Array). 24 is a registration roller that adjusts the timing of the leading edge of the image.

FIG. 3 is a diagram showing the internal structure of the board and its relationship with the copying machine. Reference numeral 31 denotes a drive roller for moving the sheet 7, which is driven by the motor 30. The image on the sheet irradiated by the lamp 33 passes through an optical system of mirrors 34 and 35 and a lens 36, and is formed on the surface of the document, passes through the lens 23, and forms an electrostatic latent image on the photosensitive drum 12.

FIG. 4 is a block diagram of the board section 1 and the copying machine section 2. Each of them is managed by a CPU, and the CPU 37 of the board section inputs the output signal of the operation switch 6, and the driver 38. Lamp 34 via lamp regulator 39
and controls the motor 31.

In addition, 6-1 is a standard density setting button provided on the operation switch 6 of the board section, and 10-1 is the operation switch 1 of the copying section.
This is a density adjustment volume set at 0.

The CPU 60 of the copying section 2 inputs the signal from the operation switch 1o, and operates the driver 61. The lamp 13 is turned on via the lamp regulator 62, and the photosensitive drum 12! The main motor 63 that drives the main motor 63 is transmitted to the paper feed roller 19 using the solenoid 44 to transport the paper, and a micro switch for detecting the position of the document table is used to move the document table 11 to a predetermined position. 27, the document platen drive circuit 26
The charger 14 is further controlled via a high voltage transformer 65.
．． 16. Control the voltage applied to the developing device 15. Then, after checking the copy preparation, the registration roller 24 moves six times in order to convey the copy paper 9 toward the photosensitive drum at the timing of aligning the leading edge of the image. Also, each CPU37
, 60 is the standard density switching circuit of the copying section 2 in the electronic blackboard mode by the interface 50.
The receiving CPU 60 energizes the switch means 40 (relay, semiconductor switch, etc.) for switching the bias setting value sent to the high voltage transformer 65 between the concentration setting volume 10 - 1 in the operation unit 10 and a constant concentration value 42 .

The configuration and control of the board section 1 and the copying section 2 have been outlined above, and detailed operations in this embodiment will be explained in Section 5-(a).
5-(b) and 5-(C), and the timing chart of FIG. 6.

First, by turning on the power switch in the operating section 6 of the board section 1, the copying section 2 enters the routine (101) of the control flowchart for the copying section 2 shown in FIG. 5-(a). At the same time, the board section 1 enters the routine (201) of the control flowchart of the board section 1 in FIG. 5-(b). This is copy section 2
Even if the door for jam removal in the printer is opened and the door is closed after the jam removal, both the copying section and the board section enter the same routine. The copying unit 2 is kept in a wait state until the temperature of the fixing device 17 reaches the set value, and if it is in the wait state (102), it outputs an oscillation pulse (board wait signal) to the board unit (10
3). Also, even when the copying unit is copying by itself (104), an oscillation pulse (board wait signal) is output (105).
. Upon receiving the oscillation pulse (board wait signal), the board unit 1 determines that the board printing operation is in a wait state (202), displays a wait state (203), and prints the board until the oscillation pulse (board wait signal) disappears. It does not go into the key receiving routine. The operations up to this point correspond to section A in the timing chart of FIG. 6 (BBIN is the output signal from the copying section). Next, when the copying section enters the standby state, it outputs a board standby signal to the board section (signal level is Hi), and the board section receives the signal and waits for the board print key to be pressed (207). However, if there is an abnormality on the copying unit side during this time, such as an abnormality in temperature control, a PPC error signal is output (the signal level is Low), and the board receives that signal and determines whether there is an abnormality in the copying unit (205). A message indicating that the copying unit is abnormal is displayed (206) and the board print key is not accepted. However, even during this time, the sheet feed key on the board section is always kept in place. The operation up to this point corresponds to part B in the timing chart of FIG. When the board print key is pressed in this board print standby state (207),
A board print signal is output from the board section (208) (
(The signal level of BBOUT in the timing chart of FIG. 6 becomes Hi), and at the same time, the fluorescent lamp 3 of the board section 1
3 is turned on (211). However, fluorescent lamps have a characteristic that the light intensity rises depending on the temperature, and it takes time to reach the required light intensity, and it may not turn on when the temperature is abnormally low. Therefore, it is necessary to set the time to detect abnormalities in the fluorescent lamp.
09), Also, since the fluorescent lights of the copying section are turned on at this timing, also set the time to detect an abnormality in the copying section fluorescent lights (2)
'IO). At this time, when the copying section receives the board print signal (106), it turns on the fluorescent lamp of the copying section and sets a timer to detect an abnormality in the fluorescent lamp of the board section in the same way as it did for the board section (107). Furthermore, a timer is set to detect an abnormality in the fluorescent light in the copying section (108), and the document table is first advanced for board printout (110). The document table advances to the position where the blank shutter is always closed (112) using sensor outputs such as microswitches, and then stops (113). However, if the document table does not move due to some abnormality, the maximum required moving time (109)
), when the stop position is not reached within ) (114), an error is displayed on the original platen (Fig. 5-(c) 116).

At the same time, a PPC abnormality signal is output to the board section (11
5). At the position where the original platen is stopped, it is determined whether the fluorescent light in the copying section has reached the required light intensity (117), and the process continues to wait until it reaches the required light intensity (118). However, if the required light intensity is not reached even after the time set by the PPCFL timer in 108), it is considered an abnormality.
5-(c) Proceed to the routine after FIG. 119. When the predetermined light intensity is reached within the time, a copying section fluorescent lamp OK signal is output to the board section (122), and the board section waits for that signal to arrive (212). The setting time of (108) and (21
0), the board section can detect an abnormality in the fluorescent lamp at the same time as the copying section using the input signal level (BBIN) of the interface (213). Thereafter, the board section displays an abnormality in the copying section, turns off the fluorescent lamp of the board section, prohibits the insertion of board print keys, and enters another key waiting routine. Then, the copying unit outputs a copying unit error signal (119) after the board unit detects an abnormality in the fluorescent lamps in the copying unit (in order to prohibit the print key on the board unit). Display and stop (121)
. (The operation up to this point is part C of the timing chart.) Next, after the fluorescent lamps in the copying section reach the required light intensity, an abnormality in the fluorescent lamps in the board section is detected. Do the same thing (123°124.215,216).

In the event of an abnormality, the copying unit turns off the fluorescent lamp (5-(c) Fig. 125), performs a sequence of moving the document table to close the blank shutter (126), and enters the post-rotation routine (125).
27), return to standby state. Turn off the fluorescent light on the board 217), display board abnormalities 21g),
The board copy key is disabled (239), and BBOUT is turned off (221) after a period of time when the copying unit detects an abnormality in the fluorescent lamp of the board unit (220). When the board fluorescent lamp reaches the required light intensity, a board fluorescent lamp OK signal is output (222) (BBOUT is turned down). (The operation up to this point is part C of the timing chart). Upon receiving this signal, the copying unit feeds paper (128), moves the document table to open the blank shutter (129), and stops at the document table position (131) where the optical path for board printing is secured (133). , if there is paper at that time (134), a copy unit preparation completion signal is output (135). During this time, the board section sets a paper out timer (223) and detects paper out and document platen abnormalities in the same way (224, 225° 136.13).
7). However, if there is no paper, the display on the board section will still show PPC error (226), but the next board print key reception will not be prohibited in either the board section or the copying section. (The timing chart up to this point is part E.)
When the paper is fed normally and the board print mode is ready, the board unit rotates the sheet (227).
A registration timing signal is output (228). (The timing chart up to this point is section F.) Upon receiving this signal (136), the copying section drives the registration rollers and conveys the copy paper (137). When the standard density setting button on the operation section of the board section is pressed (229), the board section outputs a standard density signal (230) (pulses are output as shown in part 0 of the timing chart).

When the copying section receives the standard density signal (138), it drives the bias value switching circuit shown in FIG. 7 to switch to the standard density bias (139). When the exposure of the sheet surface of the board is completed (231), an end signal is output (232), and the sheet is stopped (at the H section in the timing chart) (233).
, After a predetermined time, turn off the fluorescent light on the board 234°23
5) Enter the board into standby mode.

When the copying section receives the exposure end signal (140), it enters a routine for closing the blank shutter (141), then performs a post-rotation routine (142), and enters standby mode. (The above is part of the timing chart.) If a paper jam occurs in the copying unit during sheet exposure (143), a copying unit error signal is output and BBIN is lowered from Hi to Low) (144), a jam is displayed. Stop (145).

The board section receives this signal (236), turns off the fluorescent light in the board section (237), stops the sheet at a position one page forward from the point where exposure started (238, 239), and returns to the key human power waiting routine. move on.

"Effects" - As explained, the present invention has the first density setting means for copying at a constant density and the fjS2 density setting means for copying the above image at an arbitrary density. death,
When the above-mentioned first density setting means is selected, the density set by the second density setting means is invalidated, which simplifies the density setting when copying on the board, and also makes it easier to set the density for normal copying. This also makes it possible to adjust the concentration at the time of printing.

[Brief explanation of the drawing]

Fig. 1 is an external view of an electronic blackboard embodying the present invention, Fig. 2 is a perspective view of the main body of the copying machine, Fig. 3 is the board part, and Fig. 6 is the board part, timing 1 in board print mode, and 2. is the copying section, 6 is the operation section of the board section, 6-1 is the standard density setting button, 7 is the sheet, 10 is the copying section operation section, 10-1 is the copying section density setting volume, 11 is the original table, 13 is the copying section 19 is a paper feeding roller, 24 is a registration roller, 25 is a blank shutter, 33 is a board fluorescent lamp, 40 is a bias mode switching means, and 42 is a standard density value setting resistor.

Claims (3)

[Claims] (1) A board writing section, a copying means for copying the image formed on the board writing section, a first density setting means for copying the above image at a constant density, and a copying means for copying the above image at a desired density. a second density setting means for setting the density, and when the first density setting means is selected, the density set by the second density setting means is invalidated. Device. (2) The copying density control device according to claim 1, wherein the copying means has a mounting table on which the original is placed in order to copy the original. (3) The copy density control device according to claim 1, characterized in that when copying an original, the copy is made at a density set by the second density setting means.