JPS6114663A - Copying machine - Google Patents

Abstract

PURPOSE:To obtain easily a correct density of a copying image by providing a control means for varying stepwise a density of a copying image set by a density setting means, as the exposing operation is continued. CONSTITUTION:When a printing key is operated in a state that switches 53a- 53c operated, a Q output signal of a DFF57b becomes a high level, a relay coil 61b is conducted electrically, a relay contact 54b is turned on, the highest input voltage is impressed to a control circuit 51, and an exposure quantity of an original is set to the maximum quantity. Subsequently, when a timer 60 outputs the next pulse signal, the Q output signal of the DFF57b becomes a low level, and a Q output signal of a DFF57b becomes a high level, therefore, a relay coil 61 is conducted electrically, a relay contact 54c is turned on, the second high voltage is impressed to the control circuit 51, and the exposure quantity is set to the quantity of the second magnitude. Therefore, in the same way, the exposure quantity is reduced stepwise as the exposing operation is continued. Accordingly, a correct density of a copying image is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a copying machine, and more particularly, to a copying machine that allows the density of a copy image to be easily set.

<Prior art> Copying machines that have been widely used in the past have been able to change the density of the copied image according to each original, from dark to light, and make 1 q of R-suitable copies. Broadly speaking, it is required to: 1) A device equipped with a 1/2-mm step setting key to visually judge the darkness of the original and change the density of the copied image by manual operation based on this judgment; and ■Ii? There are two types of printers that are equipped with a so-called automatic 1m IfIllill II+ device that automatically detects the shading of the original and automatically changes the density of the copied image in accordance with the detected density.

Among these, with a copying machine (■), it is possible to make appropriate copies for all types of originals by the operator's visual judgment or by changing the set exposure amount or development bias using the keys and making copies many times. There is a disadvantage that the density of the copied image must be set.

On the other hand, in the copying machine (2), these inconveniences have been considerably improved. However, these copying machines of the back tracking control type have the disadvantage of poor responsiveness. On the other hand, the press-screen type detects the density of a wide variety of originals and sets an appropriate exposure ratio or development bias, thereby eliminating the need for the operator to set the density of the copied image. It has the advantage of being able to easily produce copies of optimal image quality (9) without melting, but it is suitable for all types of originals.
It is possible to set ( ) to switch to manual operation, especially when placing portraits, photographs (°J) copies in barrels, and also to set J for the operator's visual judgment. , or by changing the 111 degrees of the set copy image and recopying it many times, it is inconvenient that the user has to set the appropriate density of the copy image. −
), some people prefer dark copies and others prefer whitish copies, and such preferences cannot be accommodated.

Furthermore, since the automatic 111 degree control device is expensive, there is also the problem that it cannot be incorporated into low-cost copying machines.

In other words, in any type of copying machine, if the operator sets the copy image to 81 degrees, the operator must make copies many times until the proper density of the copy image is obtained. There are disadvantages in that it takes time and effort to obtain the density of a copy image, and that a large amount of copy paper, toner, etc. is wasted.

<Purpose> This invention accomplishes the above-mentioned IF! ] The purpose of this invention is to provide a copying machine that can easily reduce the density of a copy image to an appropriate level by performing a single copying operation.

<Structure> In order to achieve the above object, the structure of the copying machine of the present invention is such that by exposing the original, light reflected from the original passes through an optical section and bends over the photoreceptor to form an electrostatic latent image. In a copying machine, a copy image corresponding to an original document is removed by forming an electrostatic WA record, making it visible in a developing position, and then transferring it onto copy paper.
r! 111 degree setting means for setting 1, and a stage for changing stepwise 11arC1 of the copied image as the exposure operation continues as the exposure operation continues. It is a feature.

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

FIG. 5 is a schematic view of the main parts of a multi-purpose optical system in which the optical system moves, and which uses a photoreceptor drum as a photoreceptor.

(1) is an original loading unit located on the F side of the copying machine main body (not shown), and an exposure lamp (21
), reflecting mirrors (22), (23), (24), a lens (25), and an optical part (2) consisting of a reflecting mirror (26), an exposure lamp (21), and an anti-D
By moving HJ[(22), (23), and (211) in the direction of the arrow, the original (D) can be sequentially exposed.

Below the optical section (2), there is a photosensitive drum (31) that rotates in the direction of the arrow for each copying operation, a snow removal lamp (32), an electrostatic charger (33), a developing KvI (
34), transcription "ft-shiv (35), oyo U'
) Transfer processing section (3) consisting of U-no (36)
61, an electrostatic latent image is formed on the surface of the photoreceptor drum (31) which is uniformly charged by the charged book jar (33). This electrostatic latent 1 is visualized into a toner image by a developing station (34), and the toner image can be transferred to copy paper (P) by a transfer 11 charger (35). Also, (4
1)1. The resist [
1-lag, the copy paper (P) can be fed at a speed approximately equal to the circumferential speed of the photosensitive drum (31).

FIG. 1 shows the electrical configuration, in which a DC voltage is applied to the input terminal of the control circuit (51), and a variable resistor (
Connect the variable terminal (52a) of 52) to a normally closed switch (!1
3a) and a fixed terminal (5
2b ) (52c) (52d) (52e
) (52f), respectively, and the shift register (5
7), timer (60), relay coil (G+l'1) (
61c ) (61d) (61c) (6
1f) etc. and 1] constitute the exposure sample control T-1'Q, and the relay contacts (!14b) (54c) (
54d ) (!+40 > (54f
) O31, (f Hatake) 11 switch (h3b)
'C connection via. , and then the 11 control circuit (51
Connect the exposure control circuit (55) to the output terminal of ), and connect the exposure lamp (21) to the tail control circuit (5!
) is applied to phase 1. II Go 1 Noru J, I'm making a sea urchin. Furthermore, a voltage of 11c1 as shown in FIG. 2 is applied to the differential circuit (56) via the normally open switch (53c),
The output signal of the differentiating circuit (56) shown in FIG.
) (57e) (57f) (57o)
The output signal of the η shift register (57) shown in FIG.
) and a normally open switch (53c
) is opened by the AND gate (59), and the output signal of the AND gate (59) is applied to the start input terminal of the timer (60) and the delay circuit (58
) are respectively applied to the stop input terminals of the timer (60), and the output signals of the timer (60) shown in the same figure are applied as clock pulses.
7h ) (57c ) (!i7+1 ) (57
e) (57f) Mark the input terminal of (57Q) with a mark InI1, and each mark shown in C1 to C6 of the same figure with IJ7/+1 Vp (57b) (5
7c ) (57d ) (57e ) <57()
(The Q output signal of 57(1) is connected to the relay coil (61b
) (61c) (61d) (61e
) (61f) FF1ll till switch switching transistor b) (62c)
((i2d) (62e) (62f). Then, the output signal of the delay circuit (58) shown in E of the same figure is applied to each D flip-flop (5
7b) (57c) (57d) (57
e) <57f) (applied to the clear input terminal of 57(1>).

In addition, the above switches (53a) (53b)
(53c) are constructed to be interlocked with each other.

With the above configuration, the switch (53a) (53
b) While operating (53c), if you operate the 1 ring] key (not shown), you will first see the first (Q n's D Noritsubu - 70 Tsubu (57b 'I's Q output Kai 8 bow is 61 novels) I "Su,') L/-] I/l/ <61h)
I,: 1'N shite'J l/-IB+::t (54b
) to turn on rnv, m is also an input? TILL is applied to the control circuit (51), and by applying high power to the exposure lamp M/1)IJ, the exposure amount can be set to a maximum of 1rl, and the original 1^ can be exposed.

Next, when the timer (60) outputs the next pulse, the Q output signal of the first stage D flip flop (571) becomes low level, and the second stage D flip flop (57c) becomes low level. ) becomes high level, the relay coil (61c) is energized and the relay contact (54c) is turned on.
) is turned ON, and the second highest input voltage is applied to the control circuit (51
). Therefore, the document can be exposed by setting the exposure amount to the second largest predetermined amount.

Thereafter, the Q output signals of the D flip-flops (', +7d) (57e) (57f) from the third stage to the fifth stage become high level, and the relay contacts (54d
) (54c) (54f) 'G:ON, sequentially apply low input voltage to the Ijl 1111 circuit (21).

Therefore, the original can be exposed by sequentially decreasing the exposure amount.

After that, the Q output signal of the D flip-flop (57a) at the entrance of the 6th stage becomes high level, and when a predetermined period of time has elapsed, the delay circuit (58) outputs a high level reset signal. In addition to stopping the pulse output of the timer (60), all D flip 70 knobs (57b) (
57c) (57d) (57e) (5
7f) Rehit (57o).

Figure 3 shows a copy corresponding to the original exposed as described in 1 above, and corresponds to five levels of exposure, ranging from a whitish area with a high exposure level to a dark area with a small exposure level. Area <dl) (d2) (d3)
(d4) (d5) will exist.

And this area ((eye) (d2) (d3)
(+I4) (tl!+) is the specified (
Attach to f/Fi (l et J'l/, -i1J pawl setting key (11) to form a joint/, T m IQ display vehicle weight 1 scale 1.2.3, 4.!' ) (See Figure 4)k-1
1,6sa1! It is being

Therefore, by visually inspecting this single copy, ii! You can check the IiT exposure setting, and then press the switch (53a) <5311)
(530) and move the variable terminal (52a) to the position corresponding to the operation of the 111 degree setting key (11) by operating the l1M setting key (11) in accordance with the appropriate exposure amount confirmed above. After that, if you operate the print key (12) (see Figure 4),
It is possible to perform a copying operation with an appropriate exposure amount.

In the case of this embodiment, if the original is long, the above-mentioned copying operation will be performed to change the exposure amount for only a portion of the original, but this will cause no inconvenience in order to confirm the appropriate exposure amount. There isn't.

Furthermore, the present invention is not limited to the above-mentioned embodiments, and includes, for example, original size, copy size,
Setting the output pulse period W of the timer <60) or I) based on the signal indicating the 8 rate, etc., the variable resistor jll #I
The terminal is driven by a motor, etc., and the photoreceptor drum (
31), use a photoreceptor belt instead of 1J, move the original table (1) instead of moving the optical part (2), and develop the image instead of changing the power applied to the exposure lamp (21). It is possible to change the bias voltage applied to the developing sleeve of the device (34), and various other design changes can be made without changing the gist of the invention.

<Effects> As described above, in this invention, the *edge of the copied image is changed in stages during one copying operation, so that it is possible to determine the appropriateness by simply visually judging the obtained copy. To provide the unique effects of being able to confirm the density of a copy image, reducing the effort required to set the appropriate density of the copy image, and reducing the number of copies wasted to only one.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram of the copying machine, Fig. 2 is a waveform diagram of each part, Fig. 3 is a diagram showing the obtained copy, Fig. 4 is a schematic diagram showing the operation panel of the copying machine, and Fig. 5 is a schematic diagram showing the operation panel of the copying machine.
The figure is a schematic diagram of the main parts showing the internal mechanism of the copying machine. (2)...Optical section, (21>...Exposure lamp, (31
)...Photoconductor drum as a photoconductor, (34)...Developing device, (52)...Variable resistor constituting density setting means, (5
4b) (54c) (54d) (54e) (54f) ・
- Relay contacts constituting the control means, (57>... Shift register constituting the control means, (6
1b) (61C) (616X61e) (6B>-... Relay coil that constitutes the control means.

Claims (1)

[Claims] 1. By exposing the original to light, The reflected light is guided onto the photoreceptor through the optical section. to form an electrostatic latent image and develop the electrostatic latent image. After being visualized by the device, it is printed on copy paper. Copying that corresponds to the original by transcription In a copying machine designed to obtain objects, the original Darkness setting to set the density of the copied image corresponding to the original. Setting by concentration setting means and concentration setting means The density of the copied image is adjusted to the extent that the exposure operation continues. and a control means for making gradual changes accordingly. A copying machine characterized by being equipped with. 2. The density setting means applies the voltage to the exposure lamp. The above patent claim is for setting the power. A copying machine according to item 1 of the scope. 3. The density setting means applies the voltage to the developing device. This is to set the developing bias voltage. A copy of claim 1 above Machine. 4. The concentration setting means can be set by external key operation. It is possible to set the density of the copied image even if Clause 2 or 3 of the above claims Copying machine mentioned. 5. The control means performs one exposure operation. In the meantime, the density setting means sets the Sequentially change the density of the mapping in multiple stages Claim 1 above, which is Copy machine included. 6. The control means has a predetermined size. Divide the exposure area of the virtual reference document into multiple sections, The density of the copied image is changed sequentially for each section. Claim 5 above Copying machine mentioned. 7. The control means controls the density of the copy image by adjusting the exposure opening. The above is one that increases sequentially from the beginning. A copying machine according to claim 6. 8. The control means controls the density of the copy image by adjusting the exposure opening. The above is to be decreased sequentially from the beginning. A copying machine according to claim 6.