JPH02150351A - Method and apparatus for manufacturing heat-sensitive stencil plate - Google Patents

Abstract

PURPOSE:To easily control the heating temperature and to improve the reliability and safety of a heat-sensitive stencil plate manufacturing apparatus by preliminarily heating a base paper of a heat-sensitive stencil plate by a heat generating body before and image is formed by a heat generating element. CONSTITUTION:A heat generating body 16 and a fan 17 are alway kept ON, so that a heated air is blasted against a cover body 18 enclosing a thermal head 3, a laten roller 14 and a roll 2 of base papers of heat-sensitive stencil plates thereby to maintain the temperature inside the covering body 18 constant. A set temperature at the temperature sensor 15 is changed by various kinds of physical properties of a film which is a main material for a base paper 2a of a heat-sensitive stencil plate. The temperature immediately before the perforation formed by a thermal head 3 can be 30 deg.C to a value lower than a melting point of the film. The base paper 2a is pre-heated by the heat generating body 16. Therefore, in accordance with the improvement in the perforation property caused by the heating element of the thermal head, the seasonal change in the environmental temperature wherein the manufacturing apparatus of the title device is placed, hardly affects it.

Description

[Detailed Description of the Invention] Industrial f This invention relates to a heat-sensitive stencil-making method and apparatus suitable for perforating heat-sensitive stencil paper consisting mainly of a heat-sensitive film and its support in a heat-sensitive stencil printing apparatus. be.

As a thermal stencil printing apparatus of this type, one having an integrated thermal stenciling section and a printing section as shown in FIG. 5 is known. In this device, fM manuscript reading section 1
The original image read in is converted from an optical signal to an electrical signal and sent to a heating element in the thermal plate making section, the so-called thermal head 3.
Output/output to.

On the other hand, the heat-sensitive stencil paper 2a carried out from the heat-sensitive stencil paper roll 2 comes into direct contact with the heating element in the thermal head 3 while being conveyed, and is perforated by the heating element in this contact state.

Furthermore, the heat-sensitive stencil paper 2a is conveyed along the guide plate 5 by the conveyance roller 6, and when its leading edge is conveyed to the standby position of the clamper 13 of the plate w412, it is clamped and perforated while being wrapped around the outer peripheral surface of the plate cylinder 12. The Rukoto. When the image area has been read and punched, it is cut to a predetermined length by a cutter 4, thereby completing plate making and winding of the thermal stencil paper 2a around the plate cylinder 12.

Thereafter, in response to a printing instruction, the printing paper P on the paper feed tray 7 is pressed by the press roller 10 against the heat-sensitive stencil paper 2a wrapped around the outer circumferential surface of the plate cylinder 12 rotated by the drive motor 8. The inked paper is printed by transferring the ink from the roller 11, and the printed paper is discharged onto the paper discharge table 9.

However, the perforation performed by the heating element of the thermal head 3 in the conventional thermal stencil printing apparatus is affected by the environmental temperature in which the apparatus is placed.

For example, first thing in the morning in winter, the room temperature is low, and the heat-sensitive stencil paper 28 and thermal head 3 are cold, which is disadvantageous for this process, which perforates using thermal energy. Further, even when the room temperature is high during summer, the temperature is considerably lower than the temperature at which holes are formed in the heat-sensitive film, which is the main material of the heat-sensitive stencil paper 2a.

Therefore, in view of the conventional situation as described above, the present invention focuses on perforation using thermal energy of the thermal head 3 during the process from plate making to printing, and perforates each dot by applying thermal energy to each dot by the thermal head 3. The heat-sensitive stencil paper 2a is heated in advance to improve perforation performance in the thermal head 3, and to eliminate the influence of changes in the environmental temperature in which the heat-sensitive stencil printing apparatus is placed due to seasonal changes. The purpose of this invention is to provide a stencil-making method and device.

Means for solving the problem In order to achieve the above-mentioned object, the heat-sensitive stencil plate making method of the present invention is characterized in that the heat-sensitive stencil paper is preheated by a heating element before image formation by the nine heating elements.

Further, the thermal stencil making apparatus of the present invention is characterized in that it has a member that heats the thermal stencil paper before image formation by the heating element, and a sensor that detects the temperature. In the case of the stencil printing method, the thermal stencil paper is preheated by a heating element, which improves perforation performance by the heating element of the thermal head, and also reduces the effects of seasonal changes and other factors on the environmental temperature in which the thermal stencil printing equipment is placed. I won't be able to receive any money.

In the case of a heat-sensitive stencil-making apparatus, the temperature of the heat-sensitive stencil sheet heated by a heating member can be detected by a sensor, and the heating temperature can be easily controlled.

Figures 1 to 3 of ``Tomo'' 1-ri show a first embodiment in which the heat-sensitive stencil paper is preheated in a non-contact manner.

16 is a heating element, 17 is a fan, and these are always ON.
(It may be turned off by a signal from the temperature sensor 15 provided in the thermal head 3), and sends hot air into the inside of the cover unit 18 that surrounds the thermal head 3, platen roller 14, and thermal stencil paper roll 2. It is designed to maintain a constant internal temperature. The side surface of this integrated cover 18 may also be used as a side plate of the thermal stencil printing apparatus.

Reference numeral 19 indicates a heat-sensitive stencil paper roll presser, and 20 indicates a support.

There are no restrictions on the heating element 16 used above, and it is sufficient as long as it has a heat generating function.6 For safety reasons.

Alternatively, from the standpoint of control and cost, a panel heater may be sufficient, and the heating element 16 may have an appropriate wattage.

The set temperature of the temperature sensor 15 varies depending on the physical properties of the film that is the main material of the thermal stencil paper 2a used, and the temperature immediately before perforation by the thermal head 3 can range from 30°C to below the melting point of the film, but in actual use. The temperature is preferably 30°C to 70°C, and more preferably about 30°C to 50°C for films with a high heat shrinkage rate.

The temperature is controlled by the control CPU 23 shown in FIG.
This is done by outputting ON/OFF signals to the heating element 16 and fan 17 in response to the input signal from the temperature sensor 15.

Figure 4 shows the second stage in which the thermal stencil paper is preheated by the contact method.
An example is shown.

Reference numerals 21 and 21 denote heating elements, which are disposed in an upper and lower pair so as to sandwich the path of the base paper 2a sent from the heat-sensitive stencil paper roll 2 to the thermal head 3.

In this example, the heating element 21.21 also has a temperature sensor 15'.

15' is provided.

In the above, the heating elements 21 and 21 are not always ON.
, there is no need to keep it. That is, the heating element 21.21 is turned on by the signal from the plate-making switch ◯N, and the set temperature is reached by the temperature sensors 15' and 15', and plate-making begins.

Other points are similar to the first embodiment, but since the heat-sensitive stencil paper 2a is in direct contact with the heating element 21.21 as a heating member, the temperature sensors 15', 15' provided on the heating element are Needless to say, it is necessary to control the temperature so that it does not rise too much.

Note that the heating elements 16, 21, and 21 in the above embodiments are merely examples, and other heating elements may be used as long as they can preheat the thermal stencil paper 2a before image formation by the heating elements. .

In the invention of claim 1, as described above, the thermal stencil paper is preheated by the heating element before image formation by the heating element, so that the perforation property of the thermal head can be improved. The thermal energy applied to the thermal head can be reduced, the service life of the thermal head can be extended, and the effects of seasonal temperature changes can be eliminated.

The invention according to claim 2 has a member that heats the heat-sensitive stencil paper as described above and a sensor that detects the temperature,
Since the heating temperature can be easily controlled, the reliability and stability of the thermal stencil making apparatus can be further improved.

[Brief explanation of the drawing]

Fig. 1 is an enlarged front view corresponding to section A in Fig. 5 showing the first embodiment of the present invention, Fig. 2 is a side view of the same as above, Fig. 3 is a control block diagram, and Fig. 4 is a second embodiment. FIG. 5 is a schematic diagram of a conventional heat-sensitive stencil printing apparatus. 1... Original reading section 2... Thermal stencil paper roll 2a... Thermal stencil paper 3... Thermal helad 1
0... Press roller 12... Plate cylinder 14... Platen roller 15, 15'... Temperature sensor 16
... Heating element 17 ... Fan 18 ... Cover integrated
21.21... Heating element P... Printing paper

Claims (1)

[Scope of Claims] 1. A thermal stencil making unit that relatively moves a thermal stencil paper in contact with a heating element to form an image on the thermal stencil paper by thermal change, and a stencil image perforated by the thermal stencil making unit. In a heat-sensitive stencil printing apparatus, the heat-sensitive stencil printing device has a printing unit that performs printing by wrapping a printing paper around the outer circumferential surface of a plate cylinder and pressing the printing paper with a press roller. A heat-sensitive stencil-making method characterized by heating. 2. A thermal stencil making unit that relatively moves the thermal stencil paper while in contact with a heating element to form an image on the thermal stencil paper due to thermal changes, and a thermal stencil making unit that forms an image on the thermal stencil paper by thermal change, and thereby transfers the image-perforated stencil to the outer peripheral surface of the printing cylinder. In a thermal stencil printing device having a printing unit that performs printing by wrapping the printing paper around the paper and pressing the printing paper with a press roller to perform printing, a member that heats the thermal stencil paper before image formation by the heating element and a sensor that detects the temperature thereof. A heat-sensitive stencil-making device comprising: