JPS6090331A - Exposure quantity setting device of electrostatic copying machine - Google Patents

Abstract

PURPOSE:To shorten a key operating time between the maximum oxposure quantity and the minimum exposure quantity which can be set, and to raise an operability, by setting an energizing power of an exposing lamp to an opposite threshold value by a control device by inputting a signal from a discriminating means. CONSTITUTION:Seven LEDs 13, a down-key 14, an up-key 15, etc. are provided adjacently on an operating part 3, the exposure quantity corresponds from the lowest (dark copying) to the highest (light copying), and one of the LEDs 13 is lighted from the left to the right. In this state, in case when a discriminating means discriminates that an energizing power (exposure level) of an exposing lamp is a settable threshold value, and also an input of an operating means exceeds this threshold value, the exposure level is set to its opposite threshold level. As a result, for instance, in case when copying is executed by the lowest exposure level after executing the copying by the highest exposure level, the exposure level can be set to the lower limit value by operating the up-key 15 once, and it can be executed by the number of times of an operation which is fewer than the number of times of an operation by the down-key 14.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an exposure amount setting device for an electrostatic copying machine, and more specifically, the present invention relates to an exposure amount setting device for an electrostatic copying machine. The present invention relates to an exposure amount setting device for an electrostatic copying machine that controls the energizing power of corners, etc. in stages.

<Prior art> In recent years, in order to improve the operability of electrostatic copying machines, especially the operability of setting the exposure amount, the exposure amount is set using a numeric keypad, and after copying is completed, the exposure amount is set automatically. Exposure ffi step setting device (see No. 1982-21165) which is designed to set the exposure amount to the standard exposure amount, and the exposure amount can be changed by one step by selectively operating the up key and down key. , and an exposure setting device (Japanese Unexamined Patent Application Publication No. 1983-1995) that allows standard exposure to be set by operating both keys simultaneously
No. 7-6870) has been filed.

That is, in the former case, the desired exposure can be set by operating the desired key after switching the numeric keypad to exposure setting mode, and the standard exposure can be automatically set after copying is completed. Although it is convenient, since the numeric keypad usually doubles as the copy number setting key, it is cumbersome to have a separate mode selection key and operate the mode selection key and the numeric keypad. The problem is that it is difficult to determine whether the value is a standard value or not.

On the other hand, in the latter case, the exposure amount can be changed by selectively operating the up key or down key, which simplifies the operation compared to the former, which requires operation using the numeric keypad and mode selection key. It has the advantage of being able to

Furthermore, by operating both keys simultaneously, a standard exposure amount can be set, which is convenient. However, if you have to change the exposure amount between the maximum and minimum settable exposure amounts, the operation time of the up or down key will be longer, especially in the case of interrupt copying. The problem with this method is that key operations must be performed for a long time when interrupt copying is started and when interrupt copying is completed, resulting in a decrease in operability.

<Purpose> The present invention has been made in view of the above problems, and aims to improve operability by shortening the key operation time as much as possible between the settable maximum and minimum exposure amounts. An object of the present invention is to provide an exposure amount setting device that can perform the following steps.

<Configuration> The configuration of the exposure amount setting device of the present invention for achieving the above object is as follows:
In an exposure amount setting device for an electrostatic copying machine having a control device for controlling energy power, an up operation means for increasing the energy power of an exposure lamp by one step by the control device; a down operation means for reducing the power by one level; and a determination means for determining that the energizing power of the exposure lamp is at a settable limit value and that the input from the operation means causes the limit value to be exceeded. , and a setting means for setting the (-1vj power) of the exposure lamp to the opposite limit value by the control device using the signal from the discriminating means as input.

<Example> Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of an electrostatic copying machine incorporating the exposure amount setting device d of the present invention. An operating section (3) is provided, a paper feed cassette (4) is provided on the right side, and a copy tray (5) is provided on the left side. A power switch (6) is provided at the left end of the operation unit (3), and a print switch (power, clear key (81), number of copies setting key (1st),
9), the 10th copy number setting key ■) and an interrupt key (11), and the copy number setting key (91).
(A two-digit copy number display section (12) is provided close to 101. In addition, in the center of the operation section (3), as shown in an enlarged view in Fig. 2, seven LEDs are installed. (13) are arranged side by side on the left and right, and the down key (13) is provided on the left side.
4) On the right side, the up keys (15) are placed close to each other and in parallel with the LED (13).

Here, the leftmost LED (13) has the lowest exposure (,1
The rightmost LED indicates that the
(13) indicates that the exposure amount is the highest (light copy), and the middle LED (13) indicates that the exposure amount increases toward the right side. Therefore, the degree of exposure can be immediately determined by the illuminated LED (13).

Further, the up key (15) is a key switch for increasing the exposure amount, and the down key (14) is a key switch for decreasing the exposure amount.

FIG. 3 is an electrical circuit diagram of the exposure amount setting device.

(16) is a microcomputer that has RAM, ROM, CPU, clock generator, etc.
4) Outputs a 3-bit level signal L1 depending on ON-OFF of the up key (15).

Then, this 3-bit level signal L1 is converted into a decimal signal 12 of 1 to 7 by a decimal converter (17), and the LED (13) corresponding to this decimal signal can be connected. . On the other hand, the 3-bit level signal L1 is applied to the summing amplifier (18), and the summing output signal of the summing amplifier (18) causes the ramp regulator (
19) is driven.

The output signal of the lamp regulator (19) is transformed by a voltage transformer (20), rectified by a diode (24), and connected in series to a general-purpose AC power source (23) and an exposure lamp (22) as a document scanning light source. By applying a control pulse to the gate terminal of the triac (21), the energizing power of the exposure lamp (22) can be varied.

FIG. 4 is a flowchart showing the operation of the exposure amount setting device. In the following description, the energizing power of the exposure lamp (22) will be expressed as an exposure level.

When the power switch (6) is turned on, the initial settings of the electrostatic copying machine such as cleaning the photosensitive drum (not shown) are performed in step 2, and the exposure level is set to the reference level (in the case of this embodiment) in step 2. , exposure level 4 out of exposure levels 1 to 7). Then, in step (2), it is determined whether the up key (15) is ON or not, and in step (2), it is determined whether or not the down key (14) is ON.

Here, if it is determined that the [1F up key (15) is ON], for example, 300 m Se
e ~ 500 m Determine whether or not the timer T 1 whose measurement time is set to a predetermined time of 8elC is in operation,
If the timer T1 is not in operation, the timing operation of the timer T1 is started in step 2, and in step 2, it is determined whether the exposure level is at the upper limit value (exposure level 7 in this example), and the upper limit is determined. If it is not the value, the exposure level is increased by one level in step (2), and if it is the upper limit, the exposure level is set to the lower limit value (in the case of this embodiment, the exposure level is 1) in step (2). Further, if it is determined in step (2) that the timer T1 is in operation, the exposure level is not changed.

Also, if it is determined that [■1 town key (14) is ON, Stellar Pro-Ni is set, for example, 300m Se
C~500m 5 (Determine whether or not the timer T2 whose clock time is set to a predetermined time of the IC is in operation, and if the timer T2 is not in operation, start the time measurement operation of the timer T2 in step 0, Step 0 [13] determines whether the exposure level is the lower limit value (exposure level 1), and if it is not the lower limit, the exposure level is lowered by one step in step O; Set the exposure level to the upper limit (exposure level 7).

Further, if it is determined in step 0 that the timer T2 is operating, the exposure level is not changed.

If it is determined that both the down key (14) and the up key (15) are OFF, the timer T1 is stopped in step 0, and the timer T2 is stopped in step 0. This only stops the timekeeping operation, and does not change the exposure level.

After determining and processing any of [I] [nl [I[[], it is determined in step 0 whether the print switch ('7) is ON or not, and if it is OFF, the process returns to step ■ and below. If it is ON, copy processing is performed at the set exposure level in step O. Next, in step 0, it is determined whether or not a preset total number of copies have been made, and if all the copies have been completed, in step O, for example, 30 se
Step 0
In the step η, it is determined whether or not the h1 hour time set by the timer T3 has reached the set time. If all the copies have not been completed, or if the time measured by the timer T3 has not reached the set time, the determination and processing from step ① are performed again, and the time measured by the timer T3 is set. If the time has been reached, the determination and processing in step (2) and subsequent steps are performed.

If the exposure setting device consists of the electric circuit and flowchart described above, after turning on the power switch (6),
Copying at the reference level (exposure level 4) can be performed by turning on the print switch (7) without operating the dark key <14> or the up key (15). Ma IC, down key (14) or up key (15)
By operating , the exposure level can be changed by a stepwise force determined by the number of operations or operation time of each key, and a copy with a desired density can be made.

After copying at the highest exposure level, if you want to copy at the lowest exposure level, you can set the exposure level to the lower limit by pressing the up key (15>) and the down key. The number of operations required is significantly less than the number of operations when operating the key (14), or the operation time is significantly less than the operation time required when continuing to operate the down key (14), which greatly contributes to improved operability. Conversely, after copying at the lowest exposure level,
If you want to make copies at the highest exposure level,
Contrary to the above, it is only necessary to operate the down key (14) once, and this case also greatly contributes to improved operability.

<Effects> As described above, the exposure amount setting device of the present invention determines that the energizing power of the exposure lamp is at a settable limit value and that the input from the operating means causes the limit value to be exceeded. Since the energizing power is set to the opposite limit value, the energizing power can be switched from one limit value to the other in a short time and with only one input from the operating means. It has the unique effect of improving operability.

[Brief explanation of the drawing]

Figure 1 is an external perspective view of the electrostatic copying machine, and Figure 2 is the operation section (
3) is an enlarged view of the main part, FIG. 3 is an electric circuit diagram of the exposure amount setting device, and FIG. 4 is a flowchart of the same. (1)... Electrostatic copying machine, (13)... LED, (
14)... Down key as a down operation means, (1
5)...up key as an up operation means, (16
)...Microcomputer as a means of discrimination, (1
8)...Summing amplifier constituting the control device, (19)
...Lamp regulator that constitutes the control device, (21)
...TRIAC that constitutes the control device, (22)...
・Exposure lamp. Particularly 1 applicant: Sanda Kogyo Co., Ltd.

Claims (1)

[Claims] 1. In an exposure setting constant device for an electrostatic copying machine having a control device that controls the energizing power of the exposure lamp by an external operation, an up operation means for increasing the energizing power of the exposure lamp by one step by the control device; and a down operation means for decreasing the energizing power of the exposure lamp by one step; a determining means for determining that the input of the input signal causes the limit value to be exceeded; and a setting means for setting the electric power of the exposure lamp by the control device to the opposite limit value using the signal from the determining means as input. An exposure amount setting a setting of an electrostatic copying machine characterized by having the following. 2. The exposure amount setting device for an electrostatic copying machine according to claim 1, which displays the energizing power of the exposure lamp in stages by the control device. 3. The exposure amount of the electrostatic copying machine according to claim 1, in which the energizing power of the exposure lamp by the W control device is changed stepwise at predetermined time intervals by continuing to operate the operating means. Setting device. 4. An exposure amount setting device for a single-type copying machine according to claim 1, wherein the energizing power of the exposure lamp by the control device is changed by one step each time the operating means is operated once.