JPS5840743B2 - Developing device of wet copying machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves passing exposed photosensitive paper between a developing roller coated with a developer and a pressure blade that presses or contacts the roller. The present invention relates to an improved technique for a developing device of a wet-type copying machine that performs development.

In this type of developing device, conventionally, the supply of developer to the developing roller and the application of pressure of photosensitive paper to the developing roller are
Both blades are used to do this, and if these blades are kept in constant contact with the developing roller, the soft part of the developing roller surface may become distorted or deteriorated when the copying machine is stopped, causing uneven liquid absorption. Therefore, the blades are pressed against or in contact with the developing roller during operation of the copying machine.

However, supplying the developer to the developing roller using a blade has the drawback of increasing rotational resistance to the developing roller.On the other hand, the timing for bringing the pressure blade into pressure contact with the developing roller is such that the developer is evenly distributed on the developing roller. It is desirable that the developer be supplied after the developer has been supplied. Conventionally, the developer roller is rotated by the copier starting operation, and the developer supply blade is brought into pressure contact with the developer roller. The pressure blade is brought into pressure contact with the developing roller, but this requires an extremely complex cam mechanism and a switch mechanism for time delay. If the pressure blade does not come into contact with the developing roller, it means that the pressure blade is not pressed into contact with the pressure blade.For this reason, if the timing of the operation is even slightly off, the photosensitive paper may be damaged before the pressure blade comes into pressure contact with the developing roller. This has the disadvantage that it may pass between the pressure blade and the developing roller, which tends to cause developing errors.

SUMMARY OF THE INVENTION The present invention aims to eliminate the above-mentioned conventional drawbacks, and the present invention provides a developing device for a wet-type copying machine, which includes a roller that supplies a developer to a developing roller, and a pressurizer that brings photosensitive paper into pressure contact with the developing roller. The pressure blade is separated from the developing roller when the copying machine is stopped, and the supply roller is brought into pressure contact with or in contact with the developing roller when the copying machine is started, and
A guide plate is arranged to guide the photosensitive paper to the pressure contact area between the pressure blade and the developing roller, and the photosensitive paper is swung downward in the photosensitive paper conveyance direction by the photosensitive paper that has reached the vicinity of the pressure contact area. A switch with a paper detection actuator is provided with the actuator protruding into the photosensitive paper transport path defined by the guide plate, and further until the copying machine is stopped based on the detection of the photosensitive paper by the actuator. , a solenoid is provided for switching the pressure blade to press or contact the developing roller, and in conjunction with the switching, the actuator is forcibly moved out of the photosensitive paper transport path. shall be.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes the body of a wet-type copying machine, and 2 denotes a table provided at the front of the machine.A stacked document and photosensitive paper are guided by this table 2 and inserted into the machine.

Reference numeral 3 denotes an exposure device consisting of a cylinder glass 5 containing an exposure light source 4, conveyor rollers 5a, b, c, d, and a conveyor belt 1 wound between these, and the inserted original and photosensitive paper are conveyed. It is fed between the belt 7 and the cylinder glass 5 and baked.

After passing through the exposure device 3, the original is separated from the photosensitive paper and discharged onto the sheet tray 8, while the photosensitive paper is developed while being transported and guided by transport rollers 9a, 9a, transport belt 7, and guide plate 10. It passes between the pressure contact portion formed by the roller 11 and the pressure blade 12 and is sent out from the discharge port 13 .

When the photosensitive paper passes between the developing roller 11 and the pressure blade 12, the photosensitive paper is developed with a developer applied to the surface of the developing roller 11.

Reference numeral 14 denotes a supply roller that supplies developer to the developing roller 11, and this roller 14 is always supplied with developer A stored in a developer tank 15 by a replenishing member 16.

Reference numeral 17 denotes a supply roller switching mechanism, which is comprised of an L-shaped lever 18, a rotating plate 20 attached to a shaft 19' of an operation dial 19, and the like.

The bent lever 18 has a central bent portion 18a rotatably supported on the machine body 1, and the supply roller 14 is rotatably attached to one end, and the idler roller 18 is rotatably attached to the other end.
b is attached, and this roller 18b is placed on the upper surface of the peripheral edge of the rotating plate 20 so as to be removable.

As shown in FIG. 2, the one-way moving plate 20 has a stepped portion 21 formed on a part of its peripheral edge, and before turning on the operation dial 19 to turn on the copying machine, the free rotating roller 18b
is arranged so that it rides on the stepped portion 21.

Here, switch on and off the copy machine by operating dial shaft 1.
This is accomplished by a cam 22 attached to the lower end of the cam 9' and a main switch, such as a microswitch MS, provided opposite the cam 22.

The timing at which this switch is turned on and the timing at which the free rotating roller 1ab rides on the stepped portion 21 are illustrated as shown in FIG.

Figure A shows the switch on, Figure B shows the operation dial 19 being rotated in the direction of turning on the switch (in the direction of arrow P), and Figure C shows the switch on.

That is, as understood from these figures, the operation dial 1
As the roller 9 is rotated, the free rotating roller 18b first rides on the stepped portion 21, and then the switch is turned on.

By appropriately determining the arrangement of the above-mentioned lever 18 and rotating plate 20, the supply roller 14 is separated from the developing roller 11 and brought into a non-contact state when the free rolling roller 18b is not riding on the stepped portion 21. (see Figure 4), free rolling roller 1
8b rides on the stepped portion 21, the supply roller 14 is pressed against or in contact with the developing roller 11 (see Figure 1). The supply roller 14 is spaced apart, and when the switch is turned on, that is, when the copying machine is started, the supply roller 14 first presses or contacts the developing roller 11, and then the developing roller 11 and the supply roller 14 are turned on. It is rotationally driven.

Also, when stopping the copying machine, from the state shown in FIG. 3C, turn the operation dial 19 in the switch-on direction (arrow Q direction). The system stops (the supply roller and the developing roller also stop rotating), and then the free rotating roller 18b that had ridden on the stepped portion 21 falls onto the rotating plate 20, and the supply roller 14 separates from the developing roller 11. Therefore, the supply roller 14 and the developing roller 11 can be smoothly brought into contact with each other and separated from each other.

Next, 23 is a pressure blade switching mechanism, which includes a solenoid 25 that moves the plunger 24 in and out depending on whether it is energized or not.
A switch 26 that controls energization/de-energization of the solenoid 25
and a drive lever 2 whose one end is pivotally connected to the plunger 24 and whose other end is fixed to the support shaft 12a of the pressure blade 12.
7, when the solenoid 25 is de-energized, the pressure blade 12 is separated from the developing roller 11 (see FIG. 4), and when the solenoid 25 is energized, the plunger 24,
The pressure blade 12 is rotated via the drive lever 27 and the support shaft 12a to press or contact the developing roller 11 (see FIG. 1).

The switch 26 is equipped with a rotatable actuator 26a, as shown in detail in FIG. ing.

When the actuator 26a comes into contact with the leading edge of the photosensitive paper being conveyed, it is rotated in the direction shown by arrow B in FIG.

The rotation of the actuator 26a turns on the switch 26, energizes the solenoid 25, and presses or contacts the pressure blade 12 with the developing roller 11 until the copying machine is stopped.

On the other hand, the tip of the support shaft 12a is the actuator 26.
A bent rod-shaped locking member 29 is fixedly connected to the lower part of a.

When the pressure blade 12 is separated from the developing roller 11, this locking tool 29 allows the actuator 26a to protrude into the conveyance path 28 as shown by the dashed line in FIG. Pushed by the photosensitive paper, the switch 26 is turned on as shown by the two-dot chain line in FIG. 5, and the solenoid 25 is energized.
The pressure blade 12 is moved by the drive lever 27 to the developing roller 1.
1, the bent end portion of the locking tool 29 moves the actuator 26a to the solid line position in FIG. 5, that is, the photosensitive paper is transported by the guide plate 10. It is rotated to the position where it exits from the passage 28, and then locked and held at the 1,000-degree position.

With this configuration, the actuator 26a
detects only the first photosensitive paper that is conveyed, and when the pressure blade 12 is brought into contact with the developing roller 11, it is then held at the position shown by the solid line in Figure 5 by the locking device 29 and the photosensitive paper is exposed from the second sheet onward. Since it does not come into contact with the paper, wrinkles in the photosensitive paper,
Paper jams are less likely to occur.

Also, by operating the operation dial 19, the main switch MS
When the solenoid 25 is turned off, the excitation of the solenoid 25 is released and the lever 27 returns to the position shown in FIG.
1 is released, the locking tool 29 releases the lock of the actuator 26a, and the locking tool 29 releases the lock of the actuator 26a.
returns to the position shown in FIG.

According to the developing device configured as described above, when the copying machine is stopped, both the supply roller 14 and the pressure blade 12 are separated from the developing roller 11, causing distortion of the developing roller 11 and damage to the developing roller 11. Deterioration of the contact portion of the supply roller 14 or pressure blade 12
This prevents changes in pressure force over time and prevents curling.

Next, when the copying machine is started, the supply roller 14
Since the developing roller 11 and the developing roller 11 come into contact with each other under pressure, unnecessary friction is not generated between the developing roller 11 and the developing roller 11, and the developing roller 11 and the developing roller 14 are started in a state where wear is prevented.

Further, even when gears are used to transmit the drive between the developing roller 11 and the supply roller 14, the meshing thereof is performed smoothly.

At this start-up, the developer is applied and supplied to the developing roller 11 via the supply roller 14.

After the start, the first photosensitive paper is conveyed to the developing roller 11 position with a slight delay from the start, and during that time both the developing roller 11 and the supply roller 14 have rotated at least a few times, so the pressure blade 12 is transported to the developing roller 11 position. The developer is uniformly applied to the developing roller 11 before it comes into pressure contact with or comes into contact with the developing roller 11, and when the first photosensitive paper is conveyed along the guide plate 10 to the front of the developing device section, the switch 26 is turned on. The pressure blade 12 is brought into pressure contact with or contact with the developing roller 11 by detection. That is, the pressure blade 12 is brought into pressure contact with or contact with the developing roller 11 until the photosensitive paper reaches the vicinity of the pressure contact portion. The developer is supplied to the developing roller 11 evenly as much as possible, and when the photosensitive paper reaches near the pressure contact part, the actuator 26a is driven by the photosensitive paper to apply pressure. Since the pressure blade 12 is brought into pressure contact with or in contact with the developing port roller 11, the operation of the pressure blade is reliable and there is no risk of developing mistakes, thus ensuring uniform and clean development from the first photosensitive paper. can be done.

Thereafter, the pressure blade 12 is maintained in this state until the copying machine is stopped, and the actuator 26a is also maintained outside the photosensitive paper transport path 28.

As explained above, according to the present invention, since the developer is supplied to the developing roller via the supply roller, the developer can be applied more uniformly than in the conventional blade supply, and the rotation relative to the developing roller is The resistance is also extremely small, and the actuator is driven by the photosensitive paper that has reached near the pressure contact area between the pressure blade and the developing roller, and based on this, the pressure blade is pressed or brought into contact with the developing roller. Therefore, the time required for the supplied photosensitive paper to reach near the pressure blade is the time delay until the pressure blade is brought into pressure or contact with the developing roller after the copying machine is started, and the delay time is The supply timing of the photosensitive paper after the machine is started can be set artificially at will, and a complicated cam mechanism or time delay mechanism is no longer necessary, making it possible to reduce costs.

Furthermore, since the pressure blade is driven by the photosensitive paper, when the photosensitive paper is supplied, the pressure blade can be reliably brought into pressure contact with or contact with the developing roller. Even in the worst case where the photosensitive paper is supplied when it is not evenly supplied, it is now possible to reliably prevent the photosensitive paper from being taken out in a developing state.

Furthermore, in order to press or contact the pressure blade with the developing roller, the pressure blade is driven by a solenoid, and the actuator of a switch for operating the solenoid is driven by the photosensitive paper. The operation configuration is extremely simple and simple, and once the actuator is operated, it is moved out of the photosensitive paper transport path until the copying machine is stopped. There will be no disturbance or paper jams caused by the actuator.
That is, while adopting a simple photosensitive paper detection means in which the actuator of the flenoid operation switch is positioned within the photosensitive paper conveyance path, it has been possible to avoid the troubles that may result from this.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a sectional view showing the overall structure of a wet copying machine, Fig. 2 is a perspective view showing the main parts of the supply roller switching mechanism, and Fig. 3A. , B, and C are diagrams explaining the supply roller switching operation. Figure 4 is a cross-sectional view showing the supply roller and the pressure blade separated from the developing roller. Figure 5 shows the main components of the pressure blade switching mechanism. FIG. 11... Developing roller, 12... Pressure blade, 14... Supply roller, 10...
・Guidance board, 25... Solenoid, 26...
...Switch, 26a... Actuator, 2
8...Photosensitive paper conveyance path.

Claims (1)

[Claims] 1. A roller that supplies developer to the developing roller and a pressure blade that presses the photosensitive paper against the developing roller are separated from the developing roller when the copying machine is stopped, and the supply roller is moved away from the developing roller when the copying machine is started. A guide plate is arranged to press or contact the developing roller and guide the photosensitive paper to the pressure contact area between the pressure blade and the development roller, and the photosensitive paper is transported by the photosensitive paper that has reached the vicinity of the pressure contact area. A switch equipped with an actuator for detecting photosensitive paper that is operated to swing downward in the direction is provided with the actuator protruding into the photosensitive paper conveyance path defined by the guide plate, and further, based on the detection of the photosensitive paper by the actuator, A renoid is provided for switching the pressure blade to press or contact the developing roller until the copying machine is stopped, and in conjunction with the switching, the actuator is forcibly moved out of the photosensitive paper conveyance path. A developing device for a wet type copying machine, characterized in that the developing device is configured to be ejected.