JPS6037543A - Device for starting copying machine - Google Patents

Abstract

PURPOSE:To enable setting of three rolls to an optimum pressing position in the stage of starting a copying machine by providing a means for controlling the driving means o the copying machine at a prescribed speed irrespectively of the printing speed setting of the copying machine in the stage of strating the copying machine. CONSTITUTION:When the operator turns of the power source switch of a copying machine which is off, a solenoid 46 operates and a plunger 47 is pulled downward aganist the energizing force of a spring 44 and a cam 48 fixed to a cam shaft 34 rotates in an arrow direction. When the shaft 34 rotates further, cams 38, 39 push respectively upward one end of levers 2o, 22 to separate three rolls (developing soln. feed roll 12, developing roll 14 and pressing roll 16). When the three rolls 12, 14, 16 arrive at the prescribed separating position, a microswitch 32 turns off and the power source of the copying machine is turned off. The plunger 47 of the solenoid 46 returns to the home position and a projection 41 engages with a projection 48b.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starting device for a photographic machine that overlaps an original and photosensitive paper and performs exposure printing. Although it is applicable to all types of copying machines, for convenience of explanation-1, a diazo copying machine will be used as an example.

The most common developing device used in recent diazo copying machines is the so-called pressure roll system. This type of developing device has a developing roll, a pressure roll, and a developer supply roll (hereinafter, to simplify the explanation, it may be simply referred to as the three rolls), and the copying machine is turned on. Then, the rolls 1-3 change from the separated state to the pressurized contact state, and when the copying machine is turned off, the operation of the copying machine is stopped after these rolls are separated. The reason why the three rolls are separated is to prevent deformation of the rolls.

The printed photosensitive paper is developed when it passes between a developing roll and a pressure roll that are under pressure.

By the way, conventionally, when the power of the copying machine is turned on (i.e., when the copying machine is started), three wooden rolls are automatically pressurized and compressed, and when the power of the copying machine is turned off (i.e., when the copying machine is stopped),
A method has been proposed to automatically separate the three rolls (when separating the rolls). However, in conventional developing devices, when the power is turned on while the printing speed remains high (that is, the printing adjustment dial is set to high speed), a sensor (micrometer) that detects the pressurized state of the roll Switches, photo sensors, etc.) do not operate normally, so there are cases where pressure contact between the three rolls cannot be detected, and there is also the problem that the three rolls do not reach the desired pressure contact position.

Accordingly, an object of the present invention is to
Regardless of the burning speed (i.e., regardless of the setting position of the burning speed adjustment dial), the burning speed is set to a predetermined speed (i.e.,
(optimal speed for separation of three rolls and separation detection),
To provide a starting device for a copying machine that ensures the detection of pressure contact between a developing roll, a pressure roll, and a developer supply roll, and also moves three rolls to an optimal pressure position when starting the copying machine. be.

Reward 1 house 4 rows In the present invention, the original and photosensitive paper are overlapped and exposed and printed.

In a copying machine that performs development using a developer supply roll, a developing roll, and a pressure roll in the developing device, when the copying machine is started, the speed of the drive means of the copying machine is set, regardless of the printing speed setting of the copying machine. This is a starting device for a copying machine having means for setting a predetermined speed.

DESCRIPTION OF EMBODIMENT OF THE INVENTION A preferred embodiment of the present invention will now be described with reference to the accompanying drawings. Note that even if the drawings are different, the same parts are given the same reference numbers.

FIG. 1 is a simple explanatory diagram of a pressure roll type developing device to which the present invention can be applied. In FIG. 1, a developer supply roll 12 is provided so as to be immersed in the developer stored in a developer vat 10. As shown in FIG.

There is a developing roll 14 above the developer supply roll 12,
Currently, there is a pressure roll 16 above the image roll 14. The developer supply roll 12 is a roll that supplies the developer to the developer roll 14, and the developer roll 14 is a roll that applies the developer to the photosensitive paper. If the copier is turned on,
The three wooden rolls described in L are in pressure contact as shown by the solid line,
The photosensitive paper 18 is developed by passing between the developing roll 14 and the pressure roll 16.

- When the power source of the copying machine is cut off, the three wooden rolls mentioned above are separated from each other as shown by the broken lines.

FIGS. 2 and 3 are diagrams showing an example of a roll control mechanism to which the device according to the present invention is applied. In Figure 2, A is a view from one side of the copying machine, and B is a view from the other side of the copying machine.When the power to the copying machine is turned on, the three wooden rolls are under pressure. (See the positions of the three rolls indicated by solid lines in FIG. 1). A in Figure 3
and B correspond to A and B in FIG. 2, respectively, and are diagrams showing a state in which the power of the copying machine is turned off (that is, the three rolls are in the position indicated by the dotted line in FIG. 1).

In FIG. 2, the levers 20.22 are connected to shafts 24.26, respectively.
The developer supply roll 12 is fixed to one end. The end of the lever 20.22 fixing the developer supply roll 12 is urged upward by a spring 28.30, and the three rolls are brought into pressure contact as shown by the solid line in FIG. There is. The microswitch 32 is a switch that detects whether or not the three rolls are in pressure contact.As will be described later, the switch position of the microswitch 32 is directly related to turning on and off the power of the copying machine. Second
In the figure, the microswitch 32 is in the on state because the three rolls are in pressure contact. A cam 36 fixed to the camshaft 34 is a means for controlling the operation (on) and non-operation (off) states of the microswitch 32, and cams 38 and 39, which are also fixed to the camshaft 34, are means for controlling the operation (on) and non-operation (off) states of the microswitch 32. φ This is a cam for releasing pressure. The lever 40 has a shaft 42
It is pivotally supported by and biased clockwise by a spring 44. The solenoid 46 operates just before the copying machine is stopped (i.e., the plunger 47 is pulled downward), and in the state shown in FIG.
4).

Next, FIG. 3 will be explained with reference to FIG. 2. First, in FIG. 2, when the copying machine is turned on, the solenoid 46 operates, and the plunger 47 is pulled downward against the biasing force of the spring 44, causing the cam 48 fixed to the camshaft 34 to open. rotates in the direction of the arrow. Further rotation of the camshaft 34 causes the cams 38 and 39 to move toward the lever 20, respectively.
and push one end of 22 toward the other side to separate the three wooden rolls (Figure 3). When the three wooden rolls reach the predetermined separation position, the microswitch 32 is turned off, the power to the copying machine is cut off, the plunger 47 of the solenoid 46 returns to its original position, and the protrusion 41 engages with the protrusion 48b. match. That is, the state becomes the state W (as shown in FIG. 3), and this state is maintained.

Hereinafter, embodiments of the present invention will be further explained with reference to FIG. 4 for a second.

In FIG. 4, operation switches 50 and 52 are interlocked, and when this switch is pressed (turns on), the copying machine is powered on, the drive motor circuit switch 53 is closed, and one circuit is supplied with a predetermined DC current. Voltage Vcc (for example, +
1.5V) is applied.

As will be described later, once the operating switch 50.52 is pressed, power continues to flow to the relay winding 54a and the relay contact 54b closes, so even if the operating switch 50.52 is turned off, the copying machine will not operate. Power continues to be supplied.

Assume that the copying machine has just been turned on.

In this case, the copying machine is in the state shown in FIG. 3, that is, the three rolls are in the shaded state. Note that the switch 98 is a switch used to turn off the power of the copying machine, and is in an OFF state. Micro switch 32 is off! Therefore, the switch position is the position shown in Figure 4, and the NOR circuit 56 (
The NOR circuit 62 (which together with the NOR circuit 60 constitutes a flip-flop) outputs a low level signal, while the NOR circuit 62 (which together with the NOR circuit 60 constitutes a flip-flop) outputs a "high" level signal. A signal is output. Therefore, the output of the OR circuit 64 becomes a "high" level, and the output of the inverter 65 becomes a "low" level, so that the relay winding 54a is energized, and as described above, the relay contact 54b
closes and maintains its state. The outputs of the inverter 66 and the AND circuit 67 are both at "low" level,
Since the outputs of the hater 68 and the AND circuit 69 are both at the "high" level, the output of the OR circuit 70 is at the "high j level" and the output of the inverter 72 is at the "low" level. In other words, since the solenoid 46' is energized, the plunger 47 (!83
) moves (i.e. moves downward). Diodes 74 and 76 are for bypassing the reverse current generated in solenoid 46' and relay winding 54a, respectively. The “low” level signal of AND circuit 67 is further applied to inverter 78 and switch 80.

The switch 80 is turned on when a "high" level signal is applied to the terminal 80a, receives a predetermined voltage divided by the resistors 82 and 84 at the terminal 80b, and outputs it from the terminal 80c. The switch 86 is a switch similar to the switch 80, and is turned on when a "high" level signal is applied to the terminal 86a, and the potentiometer (for controlling the printing speed) 88
The voltage from the slider is received by the terminal 86b and the voltage is applied to the terminal 86c.
Output from. Note that when the signals applied to the terminals 80a and 86a are at "low" level, the switches 80 and 86
is in the off state.

- As mentioned above, the output of the AND circuit 69 is at the "high" level, so the switch 80 is on and the switch 86 is off. Therefore, a predetermined DC voltage divided by resistors 82 and 84 is applied to the (+) terminal of comparator 90 via switch 80. A harmonic of a predetermined frequency is applied to the (-) terminal of the comparator 90. Comparator 90
The square wave output from transistor 94 is applied through Zener diode 92 to the base of transistor 94.
Controls the lead 41 period of 4. in this case.

Since the conduction period of the rectangular wave of the comparator 90 is specified by the predetermined DC voltage divided by the resistors 82 and 84,
The rotational speed of the drive motor 96 is a constant value. That is, if the predetermined rotational speed of the drive motor 96 is set to the optimum speed for pressure contact detection of the three rolls and pressure contact of the rolls, the pressurized state of the developing roll, pressure roll, and developer supply roll will be adjusted. can be detected reliably, and these three wooden rolls can be reliably brought into pressure contact.

In this manner, when the power of the ladle copying machine is turned on, the motor 96 rotates at a predetermined speed, and the three wooden rolls are surely pressed into contact with each other. By the way, the microswitch 32 is turned on when the roll comes into pressure contact.

When the microswitch 32 turns on, the NOR circuit 5
6 outputs a "high" level signal, the outputs of the inverter 68 and the AND circuit 69 become "low" level, and the output of the OR circuit 70 also becomes "low" level, so the output of the inverter 72 becomes "low" level. "High" level. Therefore, when the solenoid winding 46' is energized or stopped, the plunger 47 of the solenoid 46 is pulled upward, and the lever 40
The projection 41 of the cam 48 engages with the projection 48a of the cam 48.

That is, the state shown in FIG. 2 is reached. On the other hand, since the output of the AND circuit 69 becomes a "low" level, the rotational speed (printing speed) of the drive motor of the copying machine is now controlled by the position of the slider of the potentiometer 88, and becomes the normal state. .

Next, the case of turning off the power of the copying machine will be explained. When the switch 98 is pressed (that is, turned on), the output of the NOR circuit 62 becomes a "low" level, so that the
The output of No. 6 is at the "r high" level. In this case, the NOR circuit 5
Since the output of the AND circuit 67 is at the "high" level, the output of the AND circuit 67 changes to the "high" level. Therefore, OR circuit 70
Since the output of the inverter 72 becomes a "high" level, the output of the inverter 72 becomes a "low" level, the solenoid winding 46' is energized, the plunger 47 of the solenoid 46 (Fig. 2) is lowered, and the camshaft 34 starts rotating. do.

Note that the output of the NOR circuit 62 is at a "low" level, and the output of the NOR circuit 56 is
Since the output of the OR circuit 64 is at the "high" level, the output of the OR circuit 64 remains unchanged and remains at the "high" level. In other words, the relay winding 54a
is energized, so the power is not turned off. By the way, since the output of the AND circuit 69 remains at the "low" level,
In the previous state, i.e., switch 86 is on and switch 80 is
is off. That is, a DC voltage corresponding to the position of the slider of the potentiometer 88 is applied to the (+) terminal of the comparator 90, as in the case of starting the copying machine described above.
The drive motor 96 is controlled by the potentiometer 88 to rotate. The camshaft 34 rotates and the microswitch 32
When OFF (the state shown in FIG. 3), the output of the NOR circuit 56 becomes a "low" level. Therefore, the outputs of the AND circuit 67 and the OR circuit 70 are both at a "low" level, and the output of the inverter 72 is at a "high" level. At the same time, the output of the OR circuit 64 becomes "low" level, and the inverter 65
Since the output becomes "high" level, the power supply to the relay winding 54a is stopped (second, and the power to the copying machine is turned off. In other words,
Return to the initial copying machine stop state.

Effect of Moxibustion As explained above, according to the present invention, when the copying machine is turned on, the printing speed is set to a predetermined value regardless of the printing speed (that is, regardless of the setting position of the printing speed adjustment dial). (i.e., the optimum speed for pressurized contact and pressure contact detection of the three rolls), it is possible to ensure the detection of the pressurized state of the developing roll, pressure roll, and developer supply roll, and to Pressurized contact can be made reliably.

4 Ming's Deformed Fist Change In the above explanation, a microswitch was used to detect the pressurized state of the roll, but the present invention is not limited to this, and other suitable detection means such as a photo sensor or a magnetic sensor may also be used. good. Further, the circuit shown in FIG. 4 is merely an example, and it goes without saying that other circuits may be used as long as they can achieve the uninvented purpose.

[Brief explanation of the drawing]

FIG. 1 is a simple explanatory diagram of a pressure roll type developing device to which the present invention can be applied, FIGS. 2 and 3 are diagrams showing an example of a roll control mechanism to which the device according to the present invention can be applied, and FIG. The figure is a circuit diagram showing one embodiment of the present invention. 12: Developer supply roll 14: Developing roll 16: Pressure roll 32: Micro switch 36.48: Cam patent applicant Copia Co., Ltd. agent Patent attorney Toshiaki Interrogator

Claims (1)

[Claims] In a copying machine that exposes and prints an original and photosensitive paper, and then develops the image using a developer supply roll, a developing roll, and a pressure roll in the developing device, before starting the copying machine, the printing speed setting of the copying machine and Regardless, a starting device for a copying machine having means for setting the speed of the drive means of the copying machine to a predetermined speed.