JPS6037541A - Device for stopping copying machine - Google Patents

Abstract

PURPOSE:To detect surely the separating condition of a developing roll, pressing roll and developing soln. feed roll by controlling the speed of a means for driving a copying machine at a prescribed speed irrespectively of the set printing speed for the copying machine in the stage of stopping the machine. CONSTITUTION:A switch 86 is turned off and a switch 80 is turned off when the operator pushes a switch 98. The prescribed voltage divided by resistors 82, 84 is therefore impressed to the + terminal of a comparator 90 and a driving motor 96 runs at a prescribed rotating speed irrespectively of the position of a slider of a potentiometer 88 so that a cam shaft 34 rotates at a preset rotating speed. The power source of the copying machine is turned off when a microswitch 32 turns off upon rotation of the shaft 34. The rotating speed of the motor 96 when the switch 80 turns on is thereupon controlled to the prescribed speed optimum for detecting the sepn. of a developing roll, pressing roll and developing soln. feed roll, by which the sepn. condition of the three rolls is surely detected.

Description

[Detailed description of the invention] The present invention is applied to a stop device for a copying machine that overlaps an original and photosensitive paper and performs exposure printing. Although the present invention is applicable to all copying machines that perform exposure printing by overlapping an original and photosensitive paper, for convenience of explanation, a diazo copying machine will be used as an example.

Earashi's recent development devices for diazo copying machines are mainly of the so-called pressure roll type. 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 three rolls mentioned above change from the separated state to the pressurized contact state, and when the power of the copying machine is turned off, the operation of the copying machine is stopped after these rolls are separated. The reason for separating the three rolls 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 turning on the power to a copying machine (i.e., when starting the copying machine), three wooden rolls are automatically pressurized and compressed, and on the other hand, when turning off the power to the copying machine (i.e., when the copying machine is started, a stop button is set). A method has been proposed for automatically separating the three rolls. However, in conventional developing devices, when the power is turned off while the printing speed remains high (that is, the printing adjustment dial is set to the high speed position), a sensor (3) that detects the release of the pressurized state of the roll (Micro switch, photo sensor, etc.) may not be working properly, so it may not be possible to detect the separation of the 3rd roll. Furthermore, if the copier stops operating, the 3rd roll may not be in the correct separation position even if the copier stops operating. there were. Therefore, conventionally, there has been a problem that the operation of the copying machine does not stop even if the power is turned off, or that the three rolls are not separated enough even if the operation of the copying machine is stopped. Ta.

[1] Accordingly, an object of the present invention is to
Regardless of the printing speed (i.e., regardless of the setting position 1d of the printing speed adjustment dial), the printing speed is set to a predetermined speed (i.e., the optimum speed for separation and separation detection of the three-piece roll), and the developing roll, A stop device for a copying machine that ensures the detection of the separation state of a pressure roll and a developer supply roll, and causes the operation of the copying machine to be stopped at an appropriate separation position of these three rolls. It is to capture and provide.

SUMMARY OF THE INVENTION The present invention provides a copying machine that exposes and prints a document and photosensitive paper in a stacked manner, and performs development using a developer supply roll, a development roll, and a pressure roll in a developing device. , a copying machine stopping device having means for setting the speed of a driving means of the copying machine to a predetermined speed regardless of the printing speed setting of the copying machine.

DESCRIPTION OF EMBODIMENTS Preferred embodiments of the 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 tank 10.

There is a developing roll 14 above the developer supply roll 12,
A pressure roll 16 is located above the developing 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. When the copying machine is powered on, the three rolls mentioned above come into pressure contact as shown by the solid lines, and as the photosensitive paper 18 passes between the developing roll 14 and the pressure roll 16, , the photosensitive paper 18 is developed.

On the other hand, when the power of the copying machine is turned off, the three rolls described above are separated from each other as shown by 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 seen from one side of the copying machine, and B is a view seen from the other side of the copying machine.When the power of the copying machine is turned on, the three wooden rolls are in a pressurized state. (See the position of the three wooden 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 third roll is 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. I/I fixing the developer supply roll 12
The ends of the bars 20.22 are held together by springs 28.30 and the three wooden rolls are in pressure contact as shown in solid lines in FIG. The microswitch 32 is a switch that detects whether or not the three rolls are in pressurized 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.

In FIG. 2, the microswitch 32 is in the on state because the three rolls are in pressure contact. The cam 36 fixed to the camshaft 34 controls the operation of the microswitch 32 (
means for controlling the on) and inoperative (off) states;
Cams 38 and 39, which are also fixed to the camshaft 34, are cams for applying and releasing pressure on the roll. The lever 40 is pivotally supported by a shaft 42 and biased clockwise by a spring 44. The solenoid 46 operates immediately before stopping the copying machine (i.e., the plunger 47 is pulled downward), and in the state shown in FIG.
4) is engaged with the protrusion 48a.

Next, FIG. 3 will be explained with reference to FIG. 2. First, in FIG. 2, when the power off switch of 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, and the cam 48 fixed to the shaft 34 rotates in the direction of the arrow. When the camshaft 34 further rotates, the cams 38 and 39 push one end of the levers 20 and 22, respectively, to the -11 side.
Separate the 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 shown in FIG. 3 is reached, and this state is maintained.

Hereinafter, embodiments of the present invention will be described in more detail with reference to FIG.

In FIG. 4, operation switches 50 and 52 are interlocked, and when this switch is pressed (that is, turned on), the power is turned on to the photocopier, the drive motor circuit switch 53 is closed, and the circuit is set to a predetermined state. DC voltage Vcc (for example, +15
V) is applied.

As will be described later, when the -1 operation switch 50.52 is pressed, current continues to flow through the relay winding 54a and the relay contact 54b closes, so even if the operation switch 50.52 is turned off, the copier continues to be supplied with power.

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 a separated state. Since the microswitch 32 is in the OFF state, the switch position is the position I7 shown in FIG. , On the other hand, the NOR circuit 62 (which forms a flip-flop together with the NOR circuit 60) outputs a "high" level signal. Therefore, the output of the OR circuit 64 is at a "high" level, and the output of the inverter 65 is at a "low" level, so that the relay winding 54a is energized, and as described above, the relay contact 54b is closed to maintain its state. Hold. The outputs of the inverter 66 and the AND circuit 67 are both at the "low" level, and the outputs of the inverter 68 and the AND circuit 69 are both at the "high" level, so the output of the OR circuit 70 is at the "high" level and the output of the inverter 72 is at the "high" level. "Low" level. That is, since the solenoid 46' is energized, the plunger 47 (FIG. 3) operates (ie, moves downward). Diodes 74 and 76 are connected to solenoid 46, respectively.
' and for bypassing the reverse current generated in the relay winding 54a. 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 described above, the output of the AND circuit 67 is at the "low" level, so the switch 86 is on and the switch 80 is off. Therefore, a DC voltage determined by the position of the slider of potentiometer 88 is applied to the (+) terminal of comparator 90 via switch 86 . Comparator 90
A silver wave of a predetermined frequency is applied to the (-) terminal of the .

The square wave output from the comparator 90 is connected to the Zener diode 9
2 to the base of transistor 94 to control the conduction period of transistor 94.

That is, since the conduction period of the rectangular wave of the comparator 90 is controlled by the position of the slider of the potentiometer 88, the rotational speed of the drive motor 96 is controlled. This control method is a pulse width control method well known to those skilled in the art, so a detailed explanation will be omitted. In this way, when you turn on the copier,
The drive motor 96 starts rotating at a speed corresponding to the position of the slider of the potentiometer 88. When the drive motor 96 starts rotating, the camshaft 34. (Fig. 3) rotates, and the microswitch 32 is turned on. When the micro switch 32 is turned on, the NOR circuit 56 outputs a "high" level signal, so the 11j output of the inverter 68 and AND circuit 69 becomes "low" level, and the output of the OR circuit 70 also becomes "low" level. ” level, so the output of the inverter 72 becomes a “high” level. Therefore, solenoid winding 4
6' is stopped, the plunger 47 of the solenoid 46 is pulled upward, and the projection 41 of the lever 40 and the projection 48a of the cam 48 are engaged. That is, the state shown in Fig. 2,
In other words, the three wooden rolls are in pressure contact. Incidentally, since the output of the AND circuit 67 remains at the "low" level, the rotational speed (printing speed) of the drive motor of the copying machine is controlled by the position of the slider of the potentiometer 88.

Next, the case of turning off the power of the copying machine, which is directly related to the present invention, will be explained. A switch 98 in FIG. 4 is used to turn off the power to the copying machine. When switch 98 is pressed (
In other words, when turned on), the output of the NOR circuit 62 is "low"
In this case, the output of the NOR circuit 56 is at the "high" level, so the output of the AND circuit 67 changes to the "high" level. On the other hand, since the output of the OR circuit 70 becomes a "high" level, the output of the inverter 72 becomes a "low" level, and the solenoid winding 46' is energized, so that the plunger 47 (FIG. 2) of the solenoid 46 is activated. The camshaft 34 moves downward and starts rotating. Note that since the output of the NOR circuit 62 is at the "low" level and the output of the NOR circuit 56 is at the "high" level, the output of the OR circuit 64 remains unchanged and remains at the "high" level. In other words, relay volume! 154a is energized, so the power is not turned off. When the output of the AND circuit 67 changes to the r-high level, the switch 86 is turned off and the switch 80 is turned on. That is, at the (+) terminal of the comparator 90,
A predetermined voltage divided by resistors 82 and 84 is applied, the drive motor 96 rotates at a predetermined rotation speed regardless of the position of the slider of the potentiometer 88, and the camshaft 34 rotates at a preset rotation speed. Become. When the camshaft 34 rotates and the microswitch 32 is turned 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 the "low" level, and the output of the inverter 72 is at the "r" level.

At the same time, the output of the OR circuit 64 becomes a "low" level and the output of the inverter 65 becomes a "high" level, so that the relay winding 54a is de-energized and the copying machine is powered off.

In other words, the copying machine returns to the initial stopped state. By the way, if the predetermined rotational speed of the drive motor 96 when the switch 80 is turned on is set to the optimum speed for separating the three rolls and detecting the separation, the separation state of the developing roll, pressure roll, and developer supply roll can be determined. can be reliably detected, and the operation of the copying machine can be stopped at the optimal separation position of these three rolls.

As described in detail, according to the present invention, when the copying machine is powered off, the printing speed is set to a predetermined speed regardless of the printing speed (i.e., regardless of the setting position of the printing speed adjustment dial). (
In other words, the optimum speed for separating and detecting the separation of three wooden rolls)
Therefore, the separation state of the developing roll, pressure roll, and developer supply roll can be reliably detected, and the operation of the copying machine can be stopped at the optimal separation position of these three rolls.

Variations and Modifications of the Invention In the above description, 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 be used. . 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 object of the present invention.

[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 Morisaki Figure 1 8

Claims (1)

[Claims] In a copying machine that exposes and prints the original and photosensitive paper one on top of the other, and develops the image using a developer supply roll, development roll, and pressure roll in the developing device, what is the printing speed setting of the copying machine when the copying machine is stopped? Regardless, a stopping device for a copying machine has means for setting the speed of the drive means of the copying machine to a predetermined speed.