JPS623227Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a device that detects the remaining amount and abnormalities due to wear of the recording needle for plate making machines such as mimeograph paper, and also removes carbon, etc. that has adhered to the tip of the recording needle during plate making. It is related to.

A plate-making machine for making mimeograph paper using a facsimile machine sets the original and the original paper on a rotating drum, reads the original with an optical reading section, gives the read signal to the recording stylus that scans the original paper, and discharges electricity to the recording stylus. The original image is then made into a master paper.
Such a recording stylus wears out during plate making, or abnormal situations such as bending or skipping occur, and carbon etc. adhere to the tip of the recording stylus, making it difficult to perform normally and accurately. It often occurs that plate making is inhibited.

Therefore, as a conventional means of detecting that the recording needle is normal, as shown in Utility Model Application Publication No. 77605/1989, an insulating part that comes into contact with the tip of the recording needle is provided at the tip of the lead contact. When rotating to the plate-making preparation state, make sure that the insulating section does not come into contact with the recording needle and conductivity occurs.If the needle breaks or bends, the insulating section does not come into contact with the recording needle and the needle A device has been proposed that directly contacts the lead contact and becomes conductive, indicating an abnormality, but according to this method, the insulation part is constantly in contact with the recording needle during plate making, and bending force is applied to the needle, resulting in needle skipping, etc. There is a risk that the needle may be bent or broken even though the length of the needle is sufficient.

The inventors of the present invention previously proposed Utility Model Application No. 186267/1983 in order to improve the above-mentioned conventional disadvantages. Its structure is such that the recording needle hangs down almost vertically in the preparation state for plate making.
A conductive detection piece is attached to a base, which contacts the needle of the recording stylus under the above conditions and is connected to a detection circuit. Specifically, it is a means for detecting needle abnormality by contact between the side of the needle and the tip of the detection piece. Therefore, the above-mentioned conventional disadvantages can be solved. However, in order to achieve even more accurate plate making, it is necessary to remove carbon and the like adhering to the tip of the recording stylus during plate making.

That is, the purpose of the present invention is to prevent bending of the needle,
It is an object of the present invention to provide a recording needle detection device for a plate-making machine that can detect breakage, wear, etc., and can also remove carbon attached to the tip of the needle.

In order to achieve such an objective, the present invention is designed so that the recording needle, which receives a signal from an optical reading device and makes a manuscript image on a base paper, is pushed down by rotation to a prepress preparation state.
The present invention is characterized in that a conductive detection piece having a tip end surface that is elastically abutted by a recording needle is attached to a base or the like in a state of preparation for plate making.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a perspective view of the main parts of the present invention in a prepress state, in which the recording needle main body 1 has a conductive base piece 2,
The base piece 2 consists of a thin needle body 3 of a predetermined length that protrudes in the length direction at the tip of the base piece 2, and the base piece 2 is inserted into the clamping part 5 of the holder 4 and is removably clamped with a screw 6. The recording stylus main body 1 is connected at its center to a shaft 7 and is suspended substantially vertically. The shaft 7 rotates clockwise in the figure when setting the plate to the plate-making state (not shown), and the tip 3a of the needle body 3 comes into elastic contact with the plate-making drum 8 shown by the chain line, and the base paper wound around the drum 8 and set thereon is rotated clockwise. Plate making is performed using electrical discharge, etc.

A base 10 is disposed on the opposite side of the recording stylus main body 1 to the direction of rotation of the stylus 3 (on the right side in the figure), and a conductive detection piece 9 connected to a detection circuit is attached to the base 10. The detection piece 9 is made of springy stainless steel or the like, and its base end 9b is fixed to the intermediate part of the base 10 together with the terminal 11 of the recording stylus detection circuit with a screw 16. Then, a detection piece 9 is placed on a lower step 10a provided in the front half of the base 10.
The intermediate portion 9c of
a to make the head portion 12b protrude above the intermediate portion 9c.

Further, the tip of the detection piece 9 is bent downward, and the tip 9a of the bent portion 9d is further bent forward, so that the tip 9a is slightly downwardly forward.

The detection piece 9 as described above constitutes a part of a recording needle detection circuit together with a lamp 15 disposed inside a knob 14 projecting on a cover 13 of a plate making machine shown in FIG.

Next, the functions and effects of the present invention will be explained.

FIG. 3 is an explanatory enlarged perspective view of the top surface of the tip 3a of the needle body 3 and the tip 9a of the detection piece 9. After completing the plate making, the recording needle main body 1 is separated from the drum 8, rotates counterclockwise in the figure around the shaft 7, and the needle body 3
An intermediate portion near the tip of the detection piece 9 contacts the front end of the tip portion 9a of the detection piece 9. This state is shown by a solid line in the figure. From this state, the recording stylus main body 1 further rotates counterclockwise, so that the sensing piece 9 made of springy stainless steel or the like is pushed down in the figure with the base 9c as a fulcrum by the rotational force of the recording stylus main body 1. With the recording stylus main body 1 hanging down as shown by the dotted line, the tip 3a of the stylus 3 elastically abuts the upper surface of the tip 9a of the detection piece.

In the above process, after the part of the needle body 3 near the tip comes into contact with the front end of the tip part 9a of the detection piece 9, the needle body 3
The tip 3a of the needle body 3 rubs against the tip 9a of the detection piece 9 during the process until the tip comes into contact with the upper surface of the tip 9a of the detection piece 9, and during rotation to the next plate-making state, so the tip Carbon adhering to 3a is rubbed off.

Further, as described above, the tip 3a of the needle body 3 and the detection piece 9
When the power to the recording needle detection circuit is turned on while the top surface of the tip 9a of It is possible to detect that the needle body 3 of the needle body 1 is normal. Subsequently, as described above, in the setting operation to the plate-making state, the recording stylus main body 1 comes into elastic contact with the original paper around eight rotations of the drum to perform plate-making. In this state, the needle body 3 and the detection piece 9 are separated, so the detection circuit is opened, and therefore the lamp 15 does not light up.

When the needle body 3 is worn out and cannot withstand plate making, there is no contact between the needle body 3 and the detection piece 9 in the plate making preparation state as shown in FIG. There is no continuity and the lamp 15 does not light up. Therefore, it is possible to detect that there is an abnormality in the recording stylus main body 1, and even if the stylus body 3 is bent or broken, the abnormality can be detected immediately.

As is clear from the above explanation, according to the present invention, upon receiving a signal from the optical reading device, the recording stylus for making a document image onto a base paper is pushed down by rotation to the prepress preparation state, and in the prepress state, the recording needle A conductive detection piece with a tip surface that elastically contacts is attached to a base, etc., so it is possible to detect abnormalities in the recording stylus needle during preparation for plate making, and at the same time remove carbon, etc. from the tip of the needle body. This invention has many advantages, such as improving the contact conditions during plate making, enabling normal and accurate plate making, and being able to achieve the above with a simple configuration.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Fig. 1 is a perspective view of the main parts of the invention, Fig. 2 is a perspective view showing an example of display means such as a lamp, and Fig. 3 is a needle body and a detection device. FIG. 4 is an explanatory enlarged perspective view of the recording needle in its pressed state with the piece, and FIG. 4 is a perspective view of the recording needle in its worn state. In the drawing, 1 is a recording needle body, 3 is a needle body, 3a is a tip of the needle, 9 is a detection piece, and 9a is a tip of the detection piece.

Claims (1)

[Scope of Claim for Utility Model Registration] An optical reading device that converts the original image into an electrical signal, and upon receiving the above signal, one rotating end makes the original image onto the base paper, and the other rotating end prepares the plate making. A recording needle located in the prepress state, and a tip surface that is pushed down when the recording needle rotates to the prepress preparation state, and in the prepress preparation state, the recording needle comes into elastic contact to remove carbon, etc. that has adhered to the recording needle. A recording needle detection device for a plate-making machine, comprising: a conductive detection piece equipped with;