JPH029949B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a press-type plate-making and printing apparatus, and particularly to a plate-making and printing apparatus that performs press-type heat-sensitive plate making and stencil printing using a heat-sensitive printing original plate. It depends.

Background of the Invention A plate-making printing device that performs thermal perforation plate making of a stencil printing original plate using a heat-sensitive sheet and stencil printing using this stencil printing original plate in a pressing manner is a practical application filed by the same applicant as the present applicant. No. 114253 (Sho 57)
15814), and this plate making printing apparatus includes a base having a pressure receiving surface, a pressing position where the pressing surface is pressed against the pressure receiving surface, and a pressing position where the pressing surface is pressed against the pressure receiving surface. A pressing plate rotatable with respect to the base is provided between an open position separated from the pressure receiving surface, and the pressure receiving surface is constituted by a cushion plate such as urethane foam, and the pressing surface is constituted by a transparent glass plate. It is composed of a light transmitting plate such as.

In the plate-making printing apparatus of the type described above, plate-making is carried out by sandwiching a polymer of a printing original plate having a heat-sensitive stencil paper and a manuscript sheet between the cushion plate and the light-transmitting plate. Printing is carried out in a thermosensitive manner by irradiating the polymer with a light beam that has passed through the light transmitting plate while the two are pressed against each other, and printing is performed by pressing the original printing plate attached to the pressing surface of the pressing plate. This is performed in a pressing manner by pressing a plate against the printing paper placed on the pressure receiving surface of the base.

In order to perform the above-described press-type printing repeatedly with good operability, the press plate is provided with a support element on its press surface portion that removably supports the printing original plate. The support element of the printing plate is useful during printing and is practically essential for a practical press-type printing device, but during press-type thermal platemaking, this support element collides with the opposing surface during the press state. This prevents the pressure contact between the heat-sensitive stencil paper and the original sheet,
Its uniformity may be adversely affected.

Purpose of the Invention The present invention provides a press-type plate-making and printing device configured such that a support element for supporting a printing original plate is effectively used during printing work, and is hidden during plate-making so as not to interfere with the plate-making work. It is an object.

Structure of the Invention According to the present invention, the above-mentioned object includes a base having a pressure receiving surface, a pressing position having a pressing surface where the pressing surface is pressed against the pressure receiving surface, and a position where the pressing surface is separated from the pressure receiving surface. In a press-type plate making printing device having a press plate movable with respect to the base between an open position and an open position, either one of the pressure receiving surface portion and the press surface portion is constituted by a light transmitting plate, and the other is constituted by a pad plate that is reversibly attached to either the base or the press plate, and the pad plate has one surface configured as a plate-making surface and the other surface configured as a printing surface. This is achieved by a press-type prepress printing apparatus characterized in that it is equipped with a support element that supports the printing original plate only on the printing surface portion.

Effects of the Invention According to the above-described configuration, during plate making, the pad plate is attached to the base or the pressing plate so that the plate-making surface portion, which is the surface portion without supporting elements, is exposed to the outside. The support element is hidden in a position on the back side where it does not interfere with the plate-making operation. As a result, the plate-making work can be performed satisfactorily with excellent adhesion without being hindered by the support element. On the other hand, during printing, the pad plate is turned upside down from its state during plate making and mounted on the base or press plate, so that the printing surface portion provided with the support elements is exposed to the outside. As a result, the printing original plate is supported by the supporting element, and press-type printing with good workability can be performed.

A cushion plate may be provided on each of the plate-making surface and the printing surface of the pad plate, and since the pad plate is used with its front and back reversed during plate-making and printing, the cushion plates on both sides of the pad plate are It is dedicated to plate making and printing. As a result, even if the cushion plate for printing may be stained with printing ink, the cushion plate for plate making will not be stained by the printing ink, and defects in plate making due to this stain can be avoided.

In addition, the cushion plates provided on both sides of the pad plate are dedicated to plate making and printing, so the hardness of each cushion plate can be adjusted to the hardness suitable for plate making and the hardness suitable for printing. It is now possible to set the stiffness individually, and by optimizing the hardness of the cushion plate, both plate-making performance and printing performance can be improved. The hardness of a cushion plate suitable for printing is softer than that for plate making, and therefore the cushion plate of the printing surface may be softer than the cushion plate for plate making.

DESCRIPTION OF EMBODIMENTS The invention will now be described in detail by way of embodiments with reference to the accompanying drawings.

FIGS. 1 to 3 show one embodiment of a press-type plate making and printing apparatus according to the present invention. In these figures, reference numeral 1 indicates a box-shaped base, and the base has a flat pressure-receiving surface portion 2 on the upper part, and the pressure-receiving surface portion is substantially entirely made of a transparent glass plate. It is composed of a light transmitting plate 3. A light source device 4 such as a xenon discharge tube is disposed inside the base 1, and a reflecting mirror 5 and a light source device 4 are disposed inside the base 1.
A power supply device (not shown) is provided, and the light source device 4 emits light when supplied with power from the power supply device, and emits light toward the light transmitting plate 3. . Further, the base 1 is provided with a plate making power switch 17.

The base 1 rotatably supports one end edge of the press plate 7 by means of a pivot 6. The press plate 7 has a pad plate 9 constituting the press surface part 8 attached to the side corresponding to the pressure receiving surface part 2 so as to be reversible from front to back. It is designed to be able to rotate relative to the base 1 around a pivot shaft 6 between an open position in which it is separated from the plate 3 and an open position.

The pad plate 9 has mounting pins 10 on the same axis at both ends thereof, and these two mounting pins are connected to two pin receiving portions 7a having spring properties provided on the pressing plate 7. By removably fitting together, it can be removably attached to the pressing plate 7. The two mounting pins 10 and the two pin receiving portions 7a are located on the same axis and are formed in the same shape, so that the pad plate 9 is attached to the pressing plate 7 so that it can be turned over and tilted only at a predetermined angle. .

As shown in FIGS. 4 to 7, the pad plate 9 has a plate-making cushion plate 1 on one side.
1 and a printing cushion plate 13 are attached to the other side. Cushion plate 11 for plate making
is made of a relatively hard elastic material such as neoprene rubber, and an Amundsen woven fabric 12 made of polyester resin fiber for degassing is adhered to the surface thereof. The cushion plate 13 for printing is made of a foamed elastic material, such as urethane foam, which is softer than the cushion plate 11 for plate making. An original supporting element 14 having a groove-shaped cross section is attached to a pair of mutually parallel side edges of the printing cushion plate 13.
A flexible original stopper 15 is provided at a pair of mutually parallel end edges, respectively.

The original printing plate used in this plate-making printing device is
In FIG. 3, the printing original plate 20 is indicated by the reference numeral 20, and includes a frame-like frame 21 made of cardboard and a heat-sensitive stencil attached to one side of the frame 21. Consisting of a printing base paper 22 and an ink impermeable ink cover sheet 23 attached to the other side of the frame 21 in an openable and closable manner, the stencil printing base paper 22 and the ink cover sheet are attached inside the frame 21. 23 so that relatively hard printing ink can be stored therein. In addition, this original printing plate 20 was applied for by the same applicant as the present applicant.
(Utility Model Application Publication No. 51-132007), and if a more detailed explanation is required, please refer to that publication.

When performing plate-making, turn on the plate-making power switch 17, attach the pad plate 9 to the pressure plate 7 so that the plate-making cushion plate 11 is exposed to the outside, as shown in FIG. A printing original plate 20 is placed on the printing original plate 20 with its heat-sensitive stencil printing paper 22 side facing upward, and then a manuscript sheet is placed on the printing original plate 20 with the print image side facing down, and then pressed. Holding the handle 7b of the plate 7, the press plate 7 is rotated from the open position as shown in the drawing toward the press position, and the plate-making cushion plate 11 is pressed against the light transmitting plate 3. This pressing force reaches a predetermined value,
When this is detected by the pressing force detection device provided in the base 1, the light source device 4 emits light, and the heat-sensitive stencil printing base paper 22 is irradiated with light, whereby perforation plate making is performed in a heat-sensitive manner. It will be done. Incidentally, this pressing force detecting device may have a structure as proposed in Japanese Patent Application No. 103281/1981 (Japanese Patent Application Laid-open No. 247229/1982) filed by the same applicant as the present applicant.

During this plate making, the original plate supporting element 14 is a pad plate 9.
and the pressing plate 7, the original support element 14
Since the pressure for plate making is performed by the cushion plate 11 which is not provided with any obstacles such as the plate supporting element 14, this pressing is performed satisfactorily without being hindered by any obstacles such as the original support element 14. Since the plate-making cushion plate 11 is made of a relatively hard elastic material, thermal plate making that requires a larger pressing force than during printing, especially thermal plate making with a solid image area, can be carried out well. Since the Amundsen woven fabric 12 is provided on the surface of the plate-making cushion plate 11, gases such as water vapor generated during plate-making can be efficiently discharged, and this also allows thermal plate-making to be performed satisfactorily.

When printing, remove the pad plate 9 from the press plate 7 as shown in FIG. 2 with the press plate 7 in the open position, and turn the pad plate 9 upside down in this removed state. As shown in FIG. 3, the pad plate 9 is attached to the press plate 7 again so that the printing cushion plate 13 is exposed to the outside, and printing ink is placed between the stencil printing base paper 22 and the ink cover sheet 23. Insert the printing original plate 20 filled with the original into the groove of the original support element 14 and attach the printing original plate to the pad plate 9. Also, the printing paper is placed on the light transmitting plate 3, and then the press plate 7 is By grasping the handle 7b, the press plate 7 is rotated from the open position shown in the drawing toward the press position, and the printing cushion plate 13 is pressed together with the printing original plate 20 toward the light transmitting plate 3. As a result, press-type stencil printing is performed.

Since the printing cushion plate 13 is made of a relatively soft elastic material, stencil printing is performed without requiring a very large pressing force, and the stencil printing base paper 22 and the ink cover sheet 23 of the printing original plate 20 are separated. During this period, the loaded printing ink becomes difficult to spread, and as a result, the printing ink is effectively used for stencil printing, and a large number of sheets can be printed with one printing ink filling. ,
In addition, in the case of multicolor printing, the degree to which printing inks of different colors mix with each other in the original printing plate 20 is reduced.

FIGS. 8 and 9 show another embodiment of the press-type plate making and printing apparatus according to the present invention. In FIGS. 8 and 9, parts corresponding to those in FIGS. 1 to 3 are designated by the same reference numerals as those in FIGS. 1 to 3.

In this embodiment, the pad plate 9 is mounted to the pressure plate 7 by a mounting pin 10 so as to be rotatable at least 180 degrees about its axis. In this embodiment, the pad plate 9 can be turned over by rotational movement without being removed from the press plate 7. The pressing plate 7 is provided with a spring stopper element 16 for holding the pad plate 9 in the reversed position as shown in the figure while allowing tilting at a predetermined angle.

In any of the above embodiments, the pressing plate 7 can be moved between the pressing position and the release position by rotating relative to the base; however, the pressing plate 7 can be moved in the vertical direction relative to the base. It may be possible to move between the pressed position and the released position by parallel movement.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited to these, and it is understood that various embodiments can be made within the scope of the present invention. It will be clear to those skilled in the art.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the state of the press-type plate making and printing apparatus according to the present invention during plate making, FIG. 2 is a perspective view showing the state of the press-type plate making and printing apparatus according to the present invention with the pad plate removed, and FIG. 3 is the present invention. FIG. 4 is a plan view of a pad plate used in the press plate making and printing device according to the present invention, and FIG. 5 is a perspective view of the pad plate shown in FIG. 4. 6 is a sectional view taken along the line - in FIG. 4, FIG. 7 is a rear view of the pad plate shown in FIG. 4, and FIG. FIG. 9 is a side view showing an embodiment of the present invention, and FIG. 9 is a cross-sectional side view showing a main part of the press-type prepress printing apparatus shown in FIG. DESCRIPTION OF SYMBOLS 1...Base, 2...Pressure surface part, 3...Light transmission plate, 4...Light source device, 5...Reflector, 6...Pivot, 7...Press plate, 8...Press surface part, 9... ...Pad board, 10...Mounting pin, 11...Cushion plate for plate making, 12...Amundsen woven fabric, 13...Cushion plate for printing, 14...Original support element, 15...
... Original stopper, 16... Stopper element, 17...
...Plate making power switch, 20...Printing original plate, 21
... Frame, 22 ... Heat-sensitive stencil printing base paper, 23
...Ink cover sheet.

Claims (1)

[Scope of Claims] 1. A base having a pressure-receiving surface, and a base having a pressure-receiving surface between a pressing position where the pressing surface is pressed against the pressure-receiving surface and an open position where the pressing surface is separated from the pressure-receiving surface. In a press-type plate-making printing apparatus having a press plate movable with respect to the base, either the pressure receiving surface portion or the press surface portion is constituted by a light transmitting plate, and the other is constituted by the base and the press plate. The pad plate is configured with one side as a plate-making surface and the other side as a printing surface, so that printing is performed only on the printing surface. A press-type plate-making and printing device characterized by comprising a support element that supports a master plate. 2. In the press-type plate-making and printing apparatus according to claim 1, the press pad plate has a cushion plate on each of the plate-making surface portion and the printing surface portion, and the cushion plate on the side of the printing surface portion is one of the cushion plates. is a press-type plate-making printing device characterized by being softer than that on the side of the plate-making surface.