JPS60163038A - Automatic exposure quantity adjusting device of copying machine - Google Patents

Abstract

PURPOSE:To obtain the titled device whose handling operation can be executed easily by providing an optical transmissivity detecting device for opening and closing freely a light source case and a photodetecting sensor case, on the outside of a copying machine body, and connecting it to the copying machine body by a flexible cable. CONSTITUTION:When a correct place for detecting and measuring an optical transmissivity of an original drawing paper is inserted between a light source case 32 and a photodetecting case 33, a start switch 38 is started, and an automatic exposure quantity adjusting device 41 starts operation. Also, when a light source lamp 21 is turned on, a photodetecting sensor 22 detects a transmitting light quantity of an original drawing paper, and an origianl drawing paper optical transmissivity detecting and measuring flexibility 23 of the automatic exposure quantity adjusting device 41 detects and measures its optical transmissivity. This measured voltage is amplified by an amplifying circuit 24, and thereafter, the voltage value is held by a holding circuit 42. This holding voltage is sent to a speed control generating circuit 26 and a timing circuit 43, and the circuit 26 converts it to a speed control signal of a driving motor 28, and adjusts automatically a rotational speed of the driving motor 28 through a motor speed controlling circuit 27.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention detects and measures the light transmittance of the original paper to give a required amount of exposure to the photosensitive paper that is conveyed in superimposed contact with the original paper. The present invention relates to an automatic exposure amount adjustment device for a copying machine for printing.

[Prior art and its problems]

FIG. 1 shows a schematic configuration diagram of a copying machine incorporating a conventional automatic exposure adjustment device. In the figure, the 68 machine 1 mainly consists of a printing section 2, an original paper transport section 3, a photosensitive paper transport section 4, an original paper/photosensitive paper transport section 5, a light transmission early detection section 6, an automatic exposure amount adjustment device 68, etc. be done. The printing section 2 includes an exposure and printing rotating drum 7, an exposure and printing light source 8 built into the drum 7, and a reflection plate 9. In addition, the original paper transport section 3 includes a table 10, an original paper feed roller 11X, and a driven feed roller 1.
2. Consists of an original paper conveyance roller 13, a conveyance driven roller 14, a guide plate 15, and the like. The original paper feed roller 11 rotates by receiving power from a drive system (not shown) of the copying machine 1, and causes the driven roller 12 to rotate. Furthermore, the rotation of the original paper conveyance roller 13 causes the conveyance driven roller 14 to fully rotate. The guide plate 15 is a guide for holding the original drawing MA and transporting it to the printing section 2. Note that the photosensitive paper conveying section 4
, the photosensitive paper feed row 216 is rotationally driven by the power of the drive system, and the photosensitive paper driven roller 7 is rotated in a driven manner to feed the photosensitive paper B.
transport. Further, the original paper/photosensitive paper conveying section 5 includes a conveying belt 18, a main drive roller 219, and a plurality of auxiliary rollers 2.
0, the main drive row 219 is rotationally driven in the direction of the arrow by the power of the drive system, and the transport pel) 18'iz is moved,
The original paper A and the photosensitive paper B, which have been superimposed in close contact with each other, are completely conveyed. At this point, the exposure and printing rotating drum 7 is rotated by the frictional force with the conveyor belt 18.

The original paper light transmittance detection section 6 includes a light source lamp 21° and a light receiving sensor 22. The light receiving sensor 22 receives the amount of light from the light source pump 21 that has passed through the original paper A being conveyed. Automatic exposure adjustment device w, 6A original paper light transmittance detection measurement circuit 23
detects and measures the light transmittance based on the light receiving voltage of the light receiving sensor 22. This light transmittance is amplified by an amplifier circuit 24, and a peak voltage of this light transmittance is detected and held by a peak detection circuit 25. This peak 'fl pressure 1f
i. The signal is converted into a speed control signal for the drive motor by the speed control generation circuit 26, and then passes through the motor speed control circuit 27 to automatically adjust the rotational speed of the drive motor 28.

By such speed adjustment, automatic exposure amount adjustment is carried out, and exposure printing of the photosensitive paper B by the exposure printing rotating drum 7 is possible. However, the light source lamp 21 and the light receiving sensor 22 are fixed at specific locations on the original paper transport path 15 inside the copying machine 1.

For this reason, it is necessary to detect and measure the light transmittance in a very narrow area of the original paper A. If lines and drawings are generally drawn in this area, the light transmittance will be incorrect. Even if the peak voltage detection circuit 25 is provided to detect the peak voltage of the light transmittance, it is difficult to achieve a satisfactory automatic exposure amount adjustment.

[Purpose of the invention]

In view of the above-mentioned points, the present invention effectively solves all the problems of the prior art, and aims to provide a simple structure, appropriate detection and measurement, and satisfactory exposure and printing. An object of the present invention is to provide an automatic exposure amount adjustment device for a copying machine that achieves the following.

[Key points of the invention]

In order to achieve such an object, the present invention includes a light source box provided outside the copying machine and containing a light source, and a light source box provided outside the copying machine facing the light source box to control the amount of light from the light source. It consists of a light receiving sensor box containing a light receiving sensor that receives light, the light source box and the light sensor box can be opened and closed, and an appropriate light transmittance can be detected and measured between the light source box and the light sensor box. The present invention is characterized in that it includes a light transmittance detection device that clamps a portion of the original drawing paper.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 2 shows a schematic configuration diagram of a copying machine to which the present invention is applied. In the figure, a copying machine main body 29ij is connected to a light transmission detection device 31 provided outside the copying machine main body 29 by a flexible cable 3o.

The light transmission detection device 31 is large enough to be operated with one hand, and is movable within an appropriate length of the flexible cable 30.

FIG. 3 is a schematic diagram of an embodiment of the present invention, and FIG. 4 is a block diagram of an automatic exposure amount adjustment device. Figures 3 and 4
In the figure, the light transmission detection device 31 is located opposite the light source box 32 and the light source box 32, and is connected to the light source box 3 by a hinge 34.
2 and a light receiving sensor box 33 which is provided so as to be openable and closable. The light source box 32 includes a metal or resin box 35, a light source lamp 21 and a lock release switch 36 built into the box 35. Moreover, the light receiving sensor box 33 is
It consists of a metal or resin box 37 having the same shape as the box 35, and a light receiving sensor 22 and a start switch 38 built into the box 37. Also, 39 is the box body 35
A light passage hole 40 is provided on the inner surface 35A of the box body 37. This box body 35
When closing the box body 37i in the A direction and the box body 37iB direction, the inner surface 35
A.

37A are combined, the light source lamp 21 and the light passing hole 39°4
0 and the light receiving sensor 22 are on the same line, and the light receiving sensor 22 receives the amount of light from the light source lamp 21.

The protruding button of the activation switch 38 protrudes from the inner surface 37A, and activates the activation switch 38 when the inner surfaces 35A and 37A are brought together. Further, reference numeral 41 shown in FIG. 4 is an automatic exposure adjustment device built into the copying machine main body 29.

With the above-mentioned configuration, lines, drawings, etc. on the original drawing paper A can be inserted and held between the inner surface 35A of the light source box 32 and the inner surface 37A of the light receiving sensor box 33 (appropriate for detecting and measuring light transmittance). For example, suppression is applied to the protruding button of the start switch 38, and the start switch 38 is activated.This activation causes the automatic exposure amount adjustment device 41 to start operating.Furthermore, when the light source lamp 21 is turned on, the light receiving sensor 22 detects the original paper. The amount of transmitted light transmitted through A is received and detected.The original paper light transmittance detection and measurement circuit 23 of the automatic exposure amount adjustment device 41 detects and measures the light transmittance, and the amplification circuit 24 electrically converts the detected and measured voltage. After amplifying this voltage, the hold circuit 42 holds this voltage.

This hold voltage is sent to speed control generation circuit 26 and timing circuit 43. The speed control generation circuit 26 converts the signal into a speed control signal for the drive motor 28, and automatically adjusts the rotational speed of the drive motor 28 via the motor speed control circuit 27. Note that the timing circuit 43 is connected to the drive motor 2.
The timing at 1 when the rotation speed of 8 reaches a stable control speed is measured, and after reaching this control speed, a locking signal is sent to the motor speed lock circuit 44. The motor lock circuit 44 locks the motor speed control circuit 27 and
Even if the original drawing paper A is removed from the light transmission wheel detection device 31, the drive motor 28 is maintained at a stable controlled speed state, and a proper copying state is maintained.

When the copying is completed, the lock release switch 36 whose operation button protrudes from the surface of the light source box 320 is activated to release the locks on the motor speed lock circuit 44 and the motor speed control circuit 270. Therefore, the controlled speed state of drive motor 28 is also released. Note that this lock release switch 36 is
Although it is provided in the light source box 32 in this embodiment, the present invention is not limited to this, and it may be provided in the main body 29 of the copying machine. Further, in this embodiment, the light source is the light source lamp 21, but it is also possible to use a light emitting diode or an optical fiber to guide the exposure and printing light source 8 shown in FIG. 1 as the light source.

Therefore, as long as the original paper A of the same quality is used, the optimum automatic exposure amount adjustment state can be maintained by proper light transmittance detection and measurement, and the light transmittance detection and measurement by using a different original paper A can be maintained. Very easy to change and easy to handle (easy to operate,
D. is also certain.

〔Effect of the invention〕

As described above, according to the present invention, a light transmitting wheel detection device that allows the light source box and the light receiving sensor box to be opened and closed is provided outside the copying machine main body, and a flexible cable connects the copying base and body. By connecting between the two, it becomes possible to select and clamp any part of the original drawing paper to detect and measure the appropriate light transmittance, improving its performance, and its structure is simple, making it easy to handle and operate. It has many advantages such as being easy to use and durable for long-term use.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a copying machine incorporating a conventional automatic exposure amount adjustment device, FIG. 2 is a schematic diagram of a copying machine to which the present invention is applied, and FIG. 3 is a schematic diagram of an embodiment of the present invention. Configuration diagram, 4th
The figure is a block diagram of the automatic exposure amount adjustment device. 21: Light source lamp, 22: Light receiving sensor, 23: Original paper light transmission detection circuit, 31: Light transmission vehicle detection device, 32:
Light source box, 33: Light receiving sensor box, 36: Lock release switch, 37: Start switch, 41: Automatic exposure amount adjustment device,
44: Motor speed lock circuit. Patent applicant Copia Co., Ltd.

Claims (1)

[Claims] l) By detecting and determining the light transmittance of the original paper,
In a copying machine that has a built-in automatic exposure adjustment device that applies a required exposure i' to the photosensitive paper that is conveyed in superimposed contact with the original paper and prints it, a light source box that is installed outside the copying machine and has a built-in light source. and a light-receiving sensor box provided outside the copying machine and containing a light-receiving sensor that faces the light source box and receives the amount of light from the light source, and opening and closing between the light source box and the light-receiving sensor box. A copying machine characterized by comprising a light transmittance detecting device which is freely adjustable between the light source box and the light receiving sensor box and which can clamp any part of the original paper where appropriate light transmission heavy metal detection and measurement can be performed. 2. In the statement of claim 1, the light transmission detection device is configured to activate the automatic exposure amount adjustment device by closing the light source box and the light receiving sensor box. An automatic exposure amount adjustment device for a copying machine characterized by being provided with a start switch.