JPH032908Y2 - - Google Patents

Description

[Detailed description of the invention] Among photolithography equipment, there is a printing press as a device for obtaining a multifaceted printing plate.

These printing presses can be roughly divided into vertical printing presses and flat printing printing machines, but the vertical printing plate machines are overwhelmingly in practical use because of their various advantages. This is the reality.

As the name suggests, a vertical printing press prints a film taken as a manuscript for plate-making printing, that is, a manuscript, and a plate material on which the image of this manuscript is printed, which are held vertically and brought into close contact with each other. It is.

When one printing is completed, the original and the printing plate are separated, and the original holder that holds the original (composed of a transparent plate for holding the original and a frame that holds the transparent plate) is used. a "manuscript holder", a "deployment frame" with a butterfly at the bottom end attached to the plate printing machine body (installation body) to which this document holder is removably attached), and a plate material holder that holds the plate material. The original and the printing plate are rolled out to opposite sides to approximately horizontal positions, the original and printing plate are pasted on to the ones for the next printing, and the original holding body and printing plate holder (these are referred to as the "unfolding body") are placed again. The original and the printing plate are made to face each other upright (that is, the original and the plate material are made to face each other), and a contact mechanism is used to bring them into close contact with each other, and then printing is performed.

In this manner, the deploying body repeats a swinging operation of approximately 90 degrees using the hinged portion to the installation body as a fulcrum each time one unit of firing is performed.

The applicant first proposed an auxiliary device for deployment in order to facilitate the above operation, and at this time, preferentially adopted a spring body with a constant elastic modulus, such as a gas spring, as the drive source for this auxiliary device. However, by configuring this auxiliary device as described below, (a) the durability of the auxiliary device itself (especially the spring body) has been dramatically improved, and (b) the hinge part, which is the fulcrum of the hinge operation, has been improved. (c) Eliminate loads that may cause damage.
Eliminating factors that impede the positional accuracy of printed image forming members (manuscripts and plate materials) by achieving the purpose of item (b) above;
(d) We succeeded in proposing an innovative device that eliminates factors that hinder work on the deployable body during deployment.

In other words, the deployment auxiliary device that provides these features is the one disclosed in Utility Application No. 57-70423 (Utility Model Application No. 58-704).
(Refer to No. 172943); This is a device that was proposed in 1999; a support arm for supporting the deployable body, which is rotatable about the hinged part of the installation body as a fulcrum, is fixed to the deployable body. The distal end of the guided body is slidably engaged with the guide groove of the guided body, and the proximal end of the guided body is rotatably attached to the installation body, while a spring body with a constant elastic modulus is connected to the free end of the deployment body. The proximal end of the spring body is rotatably attached to the installation body so that an elastic force acts in the direction of lifting the body, and the working end of this spring body is installed in an optimal manner to support the deployable body without any load. A deployable body is characterized in that the deployable body is rotatably attached to a support arm by selecting a position that can serve as a fulcrum, and the deployable body is supported by the elastic force of a spring body via the support arm. It is an auxiliary device for deployment.

This devised device exhibits the above-mentioned features and has solved all the problems of previous devices of this type.Although we do not recognize the need for improvement in fundamental respects, the devised device exhibits the above-mentioned features. Only when the present invention is applied to a document holder of a developing body, it has been discovered that further improvements are needed in the following points.

In other words, in the case of a plate holder, there is a relationship between its surface area and weight, and the load on the plate holder due to plate replacement work performed with the plate holder unfolded. In this case, a fairly large load is applied to the spring body, so in consideration of this, support legs are attached to the back of the plate holder so that it will just touch the ground when it is unfolded horizontally. , an excessive load is not applied to the spring body when the document holder is unfolded horizontally, but since the document holder does not have anything equivalent to this support leg, when the document holder is unfolded horizontally, the document holder's Since the spring body receives the total load and also receives the load associated with the work of replacing the document on the document holder, there is a concern that the spring body will have an excessively shortened effect and its durability will be impaired.

The present invention has been developed with this point in mind, and by attaching or attaching a restraining body to the spring body to prevent excessive contraction of the spring body, factors that inhibit the durability of the spring body can be eliminated. This feature is characterized by the fact that it has completely eradicated the disease, and will be described in detail below with reference to the accompanying drawings showing one embodiment.

The figures are all embodiments of the present invention, in which the device of the present invention is installed on a document holder. Figure 1 is a plan view of the document holder in an unfolded state, and Figure 2 is a side view. , and Figure 3 are side views of the printing position (upright) (the original holder is omitted only in Figure 1). A document holder consisting of a developing frame 4 attached to the printing machine main body, that is, an installation body 3, and a document holder 8, which is made up of a frame 7 attached to the developing frame 4 and holding a transparent plate 5 and a packing 6. It is.

Reference numeral 9 denotes a guide attached to the back surface of the document holder 1, and the installation body 3 is inserted into the guide groove 10 of the guide 9.
a support arm 12 whose base end is rotatably fixed 11 to the support arm 12;
A rotor 13 attached to the tip of the rotor 13 is movably engaged therewith.

14 is a gas spring whose one end is rotatably fixed to a pin 15 attached to the installation body 3; It is rotatably fixed at an optimal position for supporting the holder 1.

The configuration described above is the same as the previous proposal by the present applicant (Utility Application No. 70423/1983).

Accordingly, in the present invention, one end of the stopper 17 for preventing excessive contraction of the gas spring 14 is rotatably attached to the pin 16, and the vicinity of the other end is fixed to the gas spring 14. Because of this, it operates integrally with the gas spring 14, and this stopper 17 is
4 retracts and the document holder 1 reaches approximately horizontal position,
Since the free end portion 18 is configured to abut against the pin 15 (see FIGS. 1 and 2), the contraction action of the gas spring 14 is completely prevented, causing damage to the gas spring 14 due to excessive contraction. It is possible to simultaneously prevent this and maintain the expansion limit of the document holder 1 horizontally.

In this embodiment, the stopper 17 is provided along the gas spring 14 to prevent the gas spring 14 from being excessively shortened; however, for example,
This purpose can also be achieved by attaching restraints to appropriate locations on the rod 14' of the gas spring 14.

[Brief explanation of the drawing]

Figure 1 is a plan view of the document holder equipped with the device of the present invention in an unfolded state, Figure 2 is a side view of the same, and Figure 3 is a side view of the document holder in the printing position (upright) (Figure 1 only). (Illustration of the document holder is omitted).

Claims (1)

[Scope of Claim for Utility Model Registration] Guide groove of a guide body in which a support arm for supporting a deployable body which is rotatable about a hinged part of an installation body is fixed to a deployable body The distal end thereof is slidably engaged with the base end thereof, and the base end thereof is rotatably attached to the above-mentioned installation body, while a spring body having a constant elastic modulus is attached in the direction of lifting the free end of the deployment body. The proximal end of the spring body is rotatably attached to the installation body so that an elastic force acts, and the operating end of this spring body is located at a position that can serve as an optimal fulcrum for supporting the deployable body without a load. In an auxiliary device for deploying a deployable body, which is selected and rotatably attached to a support arm so as to support the deployable body with the elastic force of a spring body via the support arm, By attaching a restraining body to the spring body to prevent the shortening action of the spring body that occurs in proportion to the expansion of the deployment angle to a certain limit, it is possible to prevent the spring body from being excessively shortened and to make the deployment limit of the deployment body horizontal. An auxiliary device for deployment, characterized in that it is capable of being held.