JPS6237227Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wet type developing device for a copying machine.

The developing device supplies only the amount of developer necessary for development to the photosensitive paper and obtains a copy that looks relatively dry.It uses a coating roller that is partially immersed in the developer in the developer tank and draws up the developer. , a developing roller that contacts this application roller and transfers an appropriate amount of developer onto the photosensitive paper, and a pressure roller that comes into pressure contact with this development roller, and the photosensitive paper is passed between the development roller and the pressure roller. Wet type developing devices for developing are already well known. In this case, the developing roller is generally made of a rubber material with low hardness (for example, about 30 degrees of hardness), and therefore, if the pressure roller is constantly pressed against the developing roller, the developing roller will be permanently deformed, such as impressions and dents. There was a problem in that the indentation occurred and the impression appeared on the copy.

In order to solve this problem, a developing device has been proposed in which a pressure attachment/detachment device is provided to regulate the pressure applied to the pressure roller, and the pressure roller is brought into pressure contact with the developing roller only during development, and the pressure roller is normally separated from the developing roller. There is. However, in this type of developing device, even if the pressure of the pressure roller is removed during non-development, the pressure is simply removed between the coating roller and the developing roller, and the coating and developing rollers are in constant contact. ing. Therefore, as mentioned above, since the developing roller is made of a soft material,
Permanent deformation such as denting occurs at the contact portion with the coating roller due to its own weight, and this permanent deformation is particularly noticeable in wide machines such as large copying machines. The deformation of the developing roller causes uneven development, wrinkles, etc. on the photosensitive paper, which has a disadvantage in that it adversely affects the image quality of copies.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wet developing device that eliminates the above-mentioned conventional drawbacks.

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

Figure 1 shows the wet developing device according to the present invention during depressurization,
That is, it is a side view showing the state when not developing, and in the figure, reference numeral 1 is a developer tank, 2 is a developer contained in the developer tank 1, and 3 is a coating roller, the roller having a part of its circumferential surface. It is attached to the side plate 4 so as to be immersed in the developer 2. A developing roller 5 is provided above the application roller 3, and a pressing roller 6 is provided above the developing roller 5. The developing roller 5 is supported by a developing roller support part of the support means, and the developing roller support part in this example is composed of a guide groove 7 formed in the side plate 4 and a support arm 8. is inserted into the guide groove 7, and is accommodated and supported in a clearance 9 formed at the tip of the support arm 8. Press roller 6
is similarly supported by the pressure roller support part of the support means, and this support part is constituted by the guide hole 10 of the side plate and the upper end edge 11 of the tip of the support arm 8, and the shaft 6a of the pressure roller 6 is inserted into the guide hole 10. , and is supported by contacting the upper edge 11. The support arm 8 is rotatably attached to the side plate by a shaft 12, and a long hole 13 is formed at the other end of the support arm 8. Note that the coating, developing and pressing rollers 3, 5, and 6 are rotatably supported,
When pressurized as shown in FIG. 2, each is rotated in the direction of the arrow by a drive device (not shown).

A pressure roller 14 is in contact with the pressure roller 6, and this pressure roller 14 is supported by a pressure member 15. The pressure member 15 is a pressure lever 16
The pressurizing member 15 and the pressurizing lever 16, which are integrated with each other, are rotatably attached to the side plate by a shaft 17.

The free end 16a of the pressure lever 16 is in contact with the pin 19 in the pressure attachment/detachment device 18 due to its own weight.
The pin 19 is inserted into the elongated hole 13 of the support arm 8, and the base of the link 20 with the pin 19 fixed to the free end is pivotally connected to the link 22 by a shaft 21. 23, it is rotatably attached to the side plate 24 of the pressure attachment/detachment device 18. Furthermore, the movement of the link 20 is restricted by the pin 19 being fitted into a vertical long hole 24a provided in the side plate 24. link 20
The shaft 21 to which the link 22 is pivotally connected is a cam body 25
It serves as a cam follower and is in contact with the circumferential surface of the cam body 25. The cam body 25 in this example is made up of a perfectly circular disk that is eccentric, and is attached to one end of a connecting arm 26 of the shaft 21, and the other end of the connecting arm 26 is opposed to the shaft 21 with the cam body 25 in between. The shaft 27 is attached to the other end, and the shaft 2
7 is in contact with the circumferential surface of the cam body 25 and the side plate 24
By fitting into the elongated hole 28 formed in the cam body 25, the shaft 21 is securely brought into contact with the cam body 25.
The shaft 21 follows the movement of the cam body 25.

A switch cam 29 is fixed to the cam body 25, and a switch 3 is attached to the circumferential surface of the switch cam 29.
The actuator 30a of No. 0 is in contact with the actuator 30a. The cam body 25 is attached to a rotating shaft 31 which is constantly rotating via a friction clutch 32, and a sleeve 33 is provided on the outside of the friction clutch 32. This sleeve 33 is connected to the friction clutch 32, and rotates together with the cam body 25 in the direction of arrow A as the rotating shaft 31 rotates when the sleeve 33 is not restrained from the outside. The sleeve 33 is provided with a hole 33a, into which a bent piece 34a provided at one arm end of the actuating member 34 is inserted as shown in FIG. This results in sleeve 3
3 is prevented from rotating, and the cam body 25 and the switch cam 29 are in a stationary state.

The actuating member 34 has a shaft 35 fixed to the side plate 24.
The member 34 has one end attached to the side plate 24.
A tension spring 37 locked to a pin 36 fixed to the
The other end is locked, and the tension spring 37 is connected to the actuating member 3
4 is given a counterclockwise rotational habit in FIG. The solenoid 38 is fixed to the side plate 24,
The plunger 38a and the actuating member 34 are connected by a spring 39.

The present invention is constructed as described above, and its operation mode is as follows.

When the main switch (not shown) of the copying machine is turned on, the rotating shaft 31 starts rotating, and the solenoid 3
8 is also energized and the plunger 38a is pulled in. The operation of this plunger 38a is performed by the actuating member 3.
4 in the clockwise direction about the shaft 35, the bent piece 34a is inserted into the hole 33 of the sleeve 33.
a and releases the sleeve 33, and the other bent piece 34b comes into pressure contact with the circumferential surface of the sleeve 33. With the release of the sleeve 33, the sleeve 33,
The cam body 25 and the switch cam 29 rotate in the direction of arrow A.

When the sleeve 33 rotates approximately half a turn, the bent piece 34b of the actuating member 34 falls into the hole 33a, as shown in FIG. That is, the cam body 25 and the switch cam 29 are held at a half-rotated position,
During the rotation of the switch cam 29, the actuator 30a is pressed by the large diameter portion 29a, and the switch 30 is turned on. This switch 30 energizes the drive motor that rotates the rotating shaft 31 even when the main switch is turned off, causing it to rotate.
It serves to stop the rotation of the motor when the switch cam 29 returns to the original position shown in FIG.
Further, due to the rotational movement of the cam body 25, the shaft 21 is pushed away from the shaft 31, and the link 22
rotates counterclockwise about the shaft 23, and the link 20 moves to a nearly upright position.
The movement of the link 20 causes the pin 19 to move upward along the long hole 24a of the side plate 24, pushing up the support arm 8 and pressure lever 16 and rotating the support arm 8 and pressure lever 16 counterclockwise. .

The support arm 8 rotates counterclockwise around the shaft 12 and its tip portion descends, so that the developing roller 5 descends along the guide groove 7 and comes into contact with the coating roller 3 . At this time, the pressing roller 6 is not in contact with the developing roller 5 yet, but since the clearance 9 of the support arm 8 is formed to have an opening width larger than the diameter of the shaft 5a of the developing roller 5, the developing roller 5 is not in contact with the developing roller 5. Even when it comes into contact with the roller 3, the support arm 8 is provided with a margin for its tip to move further downward.
Then, as the support arm 8 continues to rotate and the pressure roller 6 continues to descend along the guide hole 10, it comes into contact with the developing roller 5, which is in contact with the application roller 3. At this time, the pressure roller 6 separates from the upper edge 11. Further, by rotating the pressure lever counterclockwise around the shaft 17, the pressure roller 14 descends and comes into pressure contact with the pressure roller 6, and the pressure roller 6 and the developing roller 5 are brought into pressure contact (see Fig. 2). ).

In this way, the pressing process is completed, and in this state, the coating, developing and pressing rollers 3, 5,
6 are rotating in the directions of arrows, respectively, and the developing roller 5 is supplied with the developer 2 from the coating roller 3, and exposed photosensitive paper (not shown) passes in the direction B between the developing and pressing rollers. Then, an appropriate amount of developer 2 is transferred onto the photosensitive paper.

When copying is completed and the main switch is turned off, the solenoid 38 is turned off, but the rotation shaft 31 is turned off by the switch 3.
It continues to rotate due to the action of zero. In FIG. 2, when the solenoid 30 is released, the actuating member 34 rotates back to its original position and the bending piece 34b is inserted into the sleeve 3.
3. Release the sleeve 33 from the hole 33a.
As a result, the hole 33a of the sleeve 33 is connected to the bent piece 34.
Rotate half a turn until it locks at point a. The cam body 25 and the switch cam 29 are rotated by half a rotation of the sleeve 33.
1, respectively, and return to the positions shown in FIG. When this rotational operation is completed, the actuator 30a returns to its original position, and the switch 3
0 is turned off and the rotation of the rotating shaft 31 stops.

Furthermore, the links 20 and 22 return to their original positions due to the rotation of the shaft 21 due to the half rotation of the cam body 25, and the pin 19 also descends along the elongated hole 24a. pin 19
When the pressure lever 16 is lowered, the pressure lever 16 is rotated clockwise by its own weight around the shaft 17, and the support arm 8 is also rotated clockwise around the shaft 12. The pressure roller 6 is rotated by the rotation of the support arm 8.
The developing roller 5 contacts the upper edge 11 and is separated from the developing roller 5, and then the developing roller 5 contacts the lower end of the gap 9, is lifted, separated from the coating roller 3, and returns to the original position shown in FIG. do. The depressurization process is thus completed.

In the wet type developing device according to the present invention, the support arm 8 has a clearance 9, and this clearance 9 allows the developing roller 5 to move away from the pressing roller 6 from the position where it contacts the pressing roller 6 as described above. It becomes possible to move between the position where it is supported, coating,
The developing and pressing rollers can be held in separate positions and in contact positions, respectively.

According to the above configuration, it is possible to hold the coating, developing and pressing rollers in pressure contact during development, and to separate the rollers when development is not being performed, thereby making it possible to prevent permanent deformation of the developing roller due to its own weight. Summer.

In the above embodiment, the guide grooves and holes formed in the side plates of the supporting parts of the developing roller and the pressing roller guide the rollers when they move. Alternatively, the support arm may be divided into two parts, a gap may be provided between the support portions of the pressing roller and the developing roller, and each may be supported by separate members.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the wet developing device according to the present invention in a non-developing state, and FIG. 2 is a side view showing the wet developing device in a developing state. DESCRIPTION OF SYMBOLS 1...Developer tank, 2...Developer, 3...Applying roller, 5...Developing roller, 6...Press roller, 8...Support arm, 9...Gap, 25...Cam body, 30... ...Switch.

Claims (1)

[Scope of utility model registration request] a coating roller that is partially immersed in the developer in the developer tank and draws up the developer; a developing roller that comes into contact with the coating roller and transfers an appropriate amount of the developer onto the photosensitive paper;
A support means comprising a pressure roller that presses the development roller and the photosensitive paper, a development roller support section that supports the development roller, and a pressure roller support section that supports the pressure roller, and coating, development, and pressure rollers, respectively. a cam body that operates the support member to a position where the rollers are separated from each other and a position where the rollers come into contact with each other, and which causes the pressure roller to perform a pressure release process and a pressure process in one rotation; and a switch control means for returning the cam body to a predetermined position when the pressure is removed. 1. A wet-type developing device for a copying machine, characterized in that the developing roller is formed so as to be movable between a position in contact with the pressure roller and a position away from the pressure roller and supported by the developing roller support itself.