JPS5825378Y2 - Diazo copying machine developing device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a developing device for a diazo copying machine.

The developing device of a conventional diazo copying machine consists of a sponge-like developing roller that applies a developing solution to the photosensitive paper and a pressure member that presses the photosensitive paper against the developing roller. Since the photosensitive paper tends to wrap around the developing roller, a member is required to prevent the photosensitive paper from wrapping around the developing roller.The surface of the developing roller has a rough distribution of holes and is not smooth, so it is difficult to develop evenly. Moreover, there is a drawback that when the development speed changes, the uniformity of development is greatly reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a developing device for a diazo copying machine that can eliminate the above-mentioned drawbacks.

The present invention will be explained below based on the illustrated embodiments.

In the figure, reference numeral 1 indicates a phenomenon roller.

The developing roller 1 is rotated in the direction of the arrow by a drive mechanism (not shown) to apply a developing solution to the photosensitive paper 2.

A roller-shaped pressure member 3 is in pressure contact with the upper part of the developing roller 1.

The pressure member 3 is rotated in the direction of the arrow and presses the photosensitive paper 2 against the developing roller 1.

The photosensitive paper 2 is fed in the direction of the arrow by a transport mechanism (not shown) and inserted between the phenomenon roller 1 and the pressure member 3.

A developing solution supply roller 6, which is rotated in the direction of the arrow and partially immersed in the developing solution 5 in the developing solution container 4, is in pressure contact with the lower part of the developing roller 1.

The developer supply roller 6 draws up the developer 5 and supplies it to the developing roller 1.

The developer roller 1 and the developer supply roller 6 have a diameter of 5 μm.
It is formed of an open-cell porous resin having a pore size distribution arbitrarily selected within the following range and a rubber hardness of 30 degrees to 70 degrees.

The current rt roller 1 and the current coating liquid supply roller 6 are made by, for example, dispersing powdered calcium carbonate in ethylene-vinyl acetate resin, then compression molding the resin, and using hydrochloric acid, nitric acid, or a mixture thereof after molding. It is formed using an open-cell porous resin made by extracting the powdered calcium carbonate.

The pressure member 3 is not limited to a roller-shaped member, but may be a plate-shaped member.

According to the present invention, the phenomenon roller 1 has a pore size distribution arbitrarily selected within the range of 5μ or less, and has a rubber hardness of 30 degrees to 70 degrees.
Since it is made of open-cell porous resin that has a
Due to the capillary action of the holes in the developing roller 1, it is possible to uniformly apply the developer to the photosensitive paper in the amount necessary for the development of the photosensitive paper. Since the photosensitive paper is absorbed by the capillary action of the holes inside, the photosensitive paper does not wrap around the developing roller 1, and the developing solution supply roller 6 is unraveled.
The roller is made of open-cell porous resin with a pore size distribution arbitrarily selected within the range of 5μ or less and a rubber hardness of 30 to 70 degrees. When the developing roller 6 rotates at a low speed, the squeezing effect of both rollers is good, so the amount of liquid supplied to the developing roller 1 is small, and it takes a long time for the liquid to be applied to the photosensitive paper by the developing roller 1. For this reason, in the past, when both rollers rotated at high speed, the squeezing effect of both rollers was poor, so there were many needles to supply the liquid to the developing roller 1, and the amount of liquid that the developing roller 1 applied to the photosensitive paper was small. Since the amount of acid is small due to its short transmission time, the effect is that the position of the liquid applied to the photosensitive paper remains almost constant even if the development speed changes.

[Brief explanation of the drawing]

The figure is a cross-sectional view of a developing device of a diazo copying machine showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Developing roller, 2... Photosensitive paper, 3... Pressure member, 5... Developer, 6... Developer supply roller.

Claims (1)

[Scope of utility model registration request] A developing roller rotates to apply a developing solution to the photosensitive paper, a pressure member presses the photosensitive paper against the developing roller, and a part of the developing roller is immersed in the developing solution in a developing solution container.
a developer supply roller that is in pressure contact with the image roller and rotates in the opposite direction to the developer roller, and the developer roller and the developer supply roller have a pore size distribution arbitrarily selected within a range of 5μ or less. A developing device for a diazo copying machine, characterized in that it is formed of an open-cell porous resin having a rubber hardness of 30 to 70 degrees.