JPS6230023Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a device for introducing photosensitive paper after printing into a developing section and developing it, particularly a developer application roll that is pressed against a pressure roll. This invention relates to a developing roll separating operation device for a copying machine that simultaneously pushes the developing roll downward and away from both the pressure roll and the wiper blade with a single touch operation from outside the machine.

(Prior art and problems) In a copying machine that uses developer, the developer is applied to the photosensitive paper by passing the photosensitive paper between a pair of upper and lower developer rolls, and at the same time, the excess developer is squeezed out. However, since both rolls are always pressed against each other, if they are left as they are even when the operation is stopped, deformation and distortion may occur on the circumferential surface of one or both rolls, resulting in uneven development,
This may cause aperture failure. In addition, when using a wiper blade to uniformize the amount of developer applied, the tip edge of the blade is pressed against the roll circumferential surface, which may cause pressure distortion on the roll circumferential surface when the operation is stopped, causing uneven development. Become. Therefore, in order to prevent this, it is necessary to separate the developing rolls from each other and to separate the wiper blade that is pressed against the peripheral surface of the roll when the operation is stopped.

Conventionally, in order to separate the rolls and wiper blades for this purpose, a method was used to separate one of the rolls and the wiper blade from the idea of separating the pressed object. A lever or linkage mechanism was used. Therefore, it is necessary to separately provide a mechanism for separating the rolls from each other and a mechanism for separating the wiper blades so that the two operations can be performed simultaneously or consecutively.Furthermore, the switch operation of the drive device must be performed separately, which is extremely troublesome. It was hot. Furthermore, if both mechanisms are to be operated in a single operation in a related manner, another interlocking mechanism will be required, which will make the mechanism even more complex, making it difficult to respond quickly and accurately, making it more likely to break down, and increasing the cost. There was a problem.

(Technical Problem) Therefore, in the present invention, when the pressure roll and the wiper blade that are in pressure contact with the coating roll are separated or brought into contact with each other, the start switch can be turned on and off with a single operation without having to perform separate operations. The technical challenge is to make it possible to turn off and on at the same time in a related manner.

(Technical Means) In order to solve the above technical problem, the present invention includes a developer application roll, a pressure roll that rotates in pressure contact with the upper surface of the developer application roll, and a pressure roll that is in elastic contact with the circumferential surface of the application roll. one or more wiper blades, the pressure roll and the wiper blade are fixed in a fixed position, and the corresponding applicator roll is in elastic contact with both the pressure roll and the fixed wiper blade at the same time. The coating roll is supported on the side plate of the support frame so as to be freely pressed down so as to be separated, and the coating roller shaft is engaged with and disengaged from the side plate of the support frame so as to push the coating roll down against the bias of the spring and hold it in the depressed position. A switching plate formed with a two-stage bearing section, high and low, is provided, and this switching plate is interlocked with an operating section so as to be operated from outside the machine, and a start switch is interlocked with the operating section.

(Function) When the operation handle 12 protruding from the top of the copying machine body 36 is operated forward (arrow A), the switching plate 11 is rotated counterclockwise (arrow B) via the connecting rod 13, so that the lower bearing The part 11a is the coating roll 2
The application roll 2 is instantly pulled upward by the force of the spring 5 in response to the shaft 2b, so that it comes into contact with the pressure roll 3 and the wiper blades 4, 4' at the same time, as shown in FIG.

Conversely, when the operating handle 12 is operated backward, the switching plate 11 rotates clockwise and the application roll shaft 2b is switched from the lower bearing part to the higher bearing part 11b, so that the application roll 2 is pushed downward. In this state, as shown in FIG. 3, the wiper blades 4 and 4' are separated from each other at the same time as they are separated from the pressure roll 3, and their respective separations are maintained.

By the above operation, when the copying machine is driven, the switch pusher 14a is pushed by the operating piece 12b interlocked with the operating handle, and the start switch 14 is turned on at the same time. Conversely, when the operating handle is operated in the stop direction, the applicator roll 2 separates from the pressure roll 3 and wiper blades 4, 4', and at the same time, the start switch 14 is turned off and the rotation of both rolls 2, 3 is transmitted. stops.

(Example) The developer application roll 2 is made of a highly hygroscopic elastic material such as sponge rubber.

The pressure roll 3 is made of a non-rusting hard material such as stainless steel, and has streaks formed on its circumferential surface, and its shafts 3a at both ends are rotatably supported by the support frame side plates 6. , its position is always fixed at a fixed position so that it does not change. Wiper blade 4, 4'
has each free end in elastic contact with the upper half of the circumferential surface of the coating roll 2 on the developer pumping side, and its base end is fixed to fixing brackets 8, 8' integral with the side plate 6 by screws 7, 7'. do. Although two wiper blades are provided in the illustrated example, one or two wiper blades may be provided. The spring 5 is coiled and bent into a U-shape to lock the shaft end of the application roll 2 to the mounting fitting 9.

Therefore, due to the traction elasticity of the spring 5, the coating roll 2 is brought into elastic contact from below against the lower circumferential surface of the pressure roll 3 which is fixed in a fixed position.

The mounting bracket 9 has an adjustment screw 1 on the upper end piece 6a of the side plate 6 so that the mounting position can be adjusted up and down.
Install with 0. Therefore, by rotating the screw 10, the tension of the spring 5 is adjusted to be strong or weak, and the pressure roll 3
The elastic force of the applicator roll 2 against the surface can be adjusted. A vertical groove 6b is provided at the lower end of the side plate 6, into which the shaft 2b of the coating roll 2 is fitted and locked from below, and which guides vertical movement of the roll 2.

The switching plate 11 of the application roll 2 is connected to the supporting frame side plate 6.
The bearing portion 11a and 11b are pivotally attached to the lower end of the bearing portion 11a and 11b.

The coating roll 2 has an end shaft 2b formed in the longitudinally divided groove 6.
This bearing part 11a, 11b in a state fitted to b
It is supported by either one of the springs 5 from below upward.

The operating handle 12 is pivotally mounted so as to protrude from the upper part of the main body 36 so as to be able to swing back and forth about a support shaft 12a, and is switched when pulled forward (in the direction of arrow A in FIG. 3) via a connecting rod 13. The plate 11 is the shaft 3a
Rotates counterclockwise (arrow B) about the fulcrum, and the higher bearing part 11a faces the vertically divided groove 6b, so the end shaft 2b of the application roll 2 is switched from the lower bearing part 11b to the higher bearing part 11a. When the rolls 2 and 3 come into contact, the operating piece 12b pushes the pusher 14a of the switch 14 to operate the drive device (not shown) of the copying machine. It is. 13a and 13b are connecting pins of the connecting rod 13.

In the figure, 15 is a baked transparent cylindrical body containing a light source lamp 16 and a reflector 17, and 18 is this cylindrical body 1.
Endless guidance belt wrapped around the circumferential surface of 5, 1
Reference numeral 9 is a drive roller that also serves as a guide for this belt 18, and 20, 21, 22, 23, and 24 are guide rollers. 25, 26 are separation rollers, 2
7, 28, 29, 30, 31, 32, and 34 are feed rollers, and 33 is a photosensitive paper tray. 35 is a container for replenishing the developer, and the developer tank 1 is placed upside down.
The liquid level a′ is kept constant.

The original N is superimposed on the photosensitive paper C, and the copying machine main body 3
When inserted through the insertion port 37 of 6, the cylindrical body 1
5 and the belt 18 while being transferred, and the original N is transferred to the separating roller 2.
The paper is separated from the photosensitive paper C by
8, and the photosensitive paper C is taken out from the machine from the guide plate 39 by feeding rollers 27, 28, 29,
The film surface is introduced downward into the developing tank 1 via 30, 31 and the guide plate 40.

The photosensitive paper C introduced into the developing tank 1 is immediately supplied between both rolls 2 and 3, is transferred while being subjected to a developing action by the rolling contact of both rolls, and is sent to a photosensitive paper tray 33 by feed rollers 32 and 34. .

The developing solution adhering to the application roll 2 due to rotation in the developing tank 1 is scraped by wiper blades 4 and 4' before reaching the contact area with the pressure roll 3, and is made into a very small amount of thin film. . Therefore, when the photosensitive paper C passes through the contact portion with the film surface facing downward, a very small amount of the thin film liquid is uniformly applied to the entire surface of the photosensitive paper C.

(Effects) Since the present invention is constructed as described above, under normal operating conditions, only the application roll is pulled upward and comes into elastic contact with both the pressure roll and the wiper blade at the same time, thereby applying the developer to the photosensitive paper. When the machine is out of operation, it is possible to release the pressure on the coating roll by simultaneously pushing it down from both the pressure blade and the wiper blade, which are fixed in place. Such pressure contact and separation can be easily and quickly performed with a single touch using an operation handle provided outside the copying machine body, and the start switch of the drive device is automatically operated in conjunction with this operation. Therefore, when the pressure roll and coating roll come into contact, it turns on and drives both rolls at the same time, and when they are stopped, they can be reliably stopped at the same time as they are separated, making operation and handling very convenient. Moreover, the structure is simple and can be implemented at low cost.

[Brief explanation of the drawing]

FIG. 1 is a side view of a copying machine equipped with the device of the present invention;
FIG. 2 is an enlarged cross-sectional view of the same essential parts, and FIG. 3 is a side view showing the operating state of the application roll with respect to the pressure roll and wiper blade. 1...Developing tank, 2...Applying roll, 3...
Pressure roll, 4, 4'...Wiper blade, 5
... Spring, 6 ... Support frame side plate, 11 ... Switching plate, 1
2... Operation handle, 13... Linking rod, 14... Switch, a... Developer, 11a, 11b... Bearing portion.

Claims (1)

[Scope of utility model registration request] Consisting of a developer application roll, a pressure roll that rotates while being in pressure contact with the upper surface of the developer application roll, and one or more wiper blades that are in elastic contact with the peripheral surface of the application roll,
The pressure roll and the wiper blade are fixedly provided in a fixed position, and the supporting frame side plate is freely pressed down so that the corresponding application roll can be brought into elastic contact with both the pressure roll and the fixed wiper blade at the same time, and separated from the same at the same time. The switch is supported on the supporting frame side plate, and has two high and low bearing portions formed on the side plate of the support frame to engage and disengage the coating roller shaft so as to push down the coating roll against the bias of the spring and hold it in the depressed position. A developing roll separation operating device for a copying machine, characterized in that a plate is provided, the switching plate is linked to an operating handle so as to be operated from outside the machine, and the operating handle is linked to a start switch of a drive device. .