JPH04363286A - stamp device - Google Patents

Abstract

PURPOSE:To rationalize the transmission amount of ink by controlling the supply of a current to a thermal head perforating thermal stencil paper to form an image so as to form perforations in the shape matching with the image and relatively reducing the shape of perforations in the region where perforations are crowded. CONSTITUTION:The thermal stencil paper 1 used in a stamp apparatus and fed by a feed means is formed from a thermoplastic film 21, an adhesive layer 23 and a porous support 25 and an image is formed to the stencil paper by a thermal head 7. The thermal head 7 has a heating part 56 and also has a protruding glaze layer 51 in order to enhance the adhesion with the stencil paper 1 on an alumina substrate 50 and a heating resistor layer 52 is arranged on the glaze layer 51 and an oxidation inhibiting layer 54 and a protective layer 55 are further provided thereon. The temp. of the heating part 56 of the thermal head is made variable by adjusting the conduction time of the current allowed to flow to conductors 53a, 53b and the size of the perforations of the stencil paper 1 is adjusted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stamp device, a stamp device using heat-sensitive stencil paper perforated by infrared irradiation or a thermal head, and particularly to a small and portable stamp device.

0002

2. Description of the Related Art Conventionally, small and portable stamp devices have been known that use mimeograph paper on which characters, figures, etc. have been drawn and perforated with an iron pen or ballpoint pen. An example of such a device is
A stamp device disclosed in Japanese Patent Publication No. 54-9523 is shown in FIG. 8(a). This includes a table 100, an ink forming unit 102, and an ink forming unit 1.
02 receives a mimeograph paper 104 reciprocably supported thereon, substantially performs mimeographing in one extreme condition, and inks the inking unit 10 in the other extreme condition.
2 can be stored or rested within the table 100.

[0003] Heat-sensitive stencil paper that can be perforated by infrared irradiation or a thermal head is also known. A typical example is a thermoplastic film and porous thin paper bonded together using an adhesive. As an example of a small portable stamp device using such heat-sensitive stencil paper, a device disclosed in Japanese Patent Application Laid-Open No. 17074/1983 is shown in FIG. 8(B). This consists of a heat-sensitive stencil paper 110 perforated in a frame 108 and an ink-impermeable cover sheet 1.
Ink is stored between the heat-sensitive stencil paper 110 and the cover sheet 112, and the stencil printing original plate 106 in which the ink is stored is placed in a cushion layer. Pedestal 1 equipped with grip member 120 having 116 and adhesive layer 118
14 and press it against the printing paper to perform stencil printing.

0004

[Problems to be Solved by the Invention] However, in the above-mentioned prior art stamping device, especially when the pressing pressure is increased, a large amount of ink is transferred to the heat-sensitive stencil paper through the large number of perforations in areas where the perforations are concentrated. 110
This causes a problem in that more ink permeates into the printing paper, and the ink dries only in that area.

Referring to FIG. 7, for example, when printing a shadow character H, an enlarged view of section E shown in FIG. 7 (b) is compared with an enlarged view of section F shown in FIG. 7 (a). As can be seen, the area of the ink overlap portion 62 is larger in the F section printing state. Therefore, an excessive amount of ink due to the ink overlap portion 62 bleeds into the area. This excessive amount of ink causes a problem in that it takes time to finish printing because it does not dry well. Another problem is that because it dries slowly, your hands get stained by contact with the ink while it dries, other areas of the printing paper become stained, and the density of that area becomes darker than other printed parts. There is a point.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a small and portable stamp device that does not allow a large amount of ink to pass through even in areas where perforations of heat-sensitive stencil paper are densely packed. be.

[0007]

[Means for Solving the Problems] In order to achieve this object, the stamp device of the present invention includes a conveying means for conveying a heat-sensitive stencil paper made by bonding a thermoplastic film and a porous support with an adhesive. a thermal head for perforating an image on the heat-sensitive stencil paper, an ink pad impregnated with ink and arranged on the porous support side of the heat-sensitive stencil paper, and forming perforations in a shape matching the image to be perforated. A control means for controlling the thermal head is provided.

[0008]

[Operation] By adjusting the current conduction time of the thermal head used in the stamp device of the present invention having the above object, the temperature of the heat generating portion of the thermal head can be changed. Furthermore, since this temperature adjustment changes the energy applied to the heat-sensitive stencil paper, it is possible to arbitrarily change the size of the perforations in the heat-sensitive stencil paper by changing the time during which current is applied to the thermal head.

Therefore, by making the shape of the perforations smaller than usual in areas where the perforations are densely packed, it is possible to reduce the amount of ink passing through the heat-sensitive stencil paper.

0010

Embodiments Hereinafter, embodiments embodying the present invention will be described with reference to the drawings. In Figure 1, heat-sensitive stencil paper (hereinafter referred to as
The base paper (abbreviated as base paper) 1 is wound at both ends by a source roll 3 and a take-up roll 5, respectively. Then, the base paper 1 pulled out from the source roll 3 is conveyed between the image forming thermal head 7 and the platen 9 arranged on the right side of the source roll 3, and further passed through the source side guide roll 15 and the take-up side. It is wound up by the winding roll 5 via the guide roll 19.

Both the source winding side guide roller 15 and the winding side guide roller 19 have flanges formed at both ends corresponding to the width of the base paper 1, and guide the base paper 1 so that it does not meander during conveyance. Further, an ink pad 32 is arranged between the original winding side guide roll 15 and the winding side guide roll 19 so that the ink-applied surfaces thereof are in contact with each other. As shown in FIG. 2(B), the base paper 1 has a thermoplastic film 21 and an adhesive layer 2.
3 and a porous support 25, and the thermoplastic film 21 and the porous support 25 are bonded to each other by an adhesive layer 23. In this embodiment, the thermoplastic film 21 is a polyethylene terephthalate film (hereinafter abbreviated as PET film) having a thickness of 2 μm, but other films include polypyrene, vinylidene chloride-vinyl chloride copolymer, and the like.

[0012] The thickness of the PET film is 1μ to 4μ.
is preferred. If it is less than 1 μm, the manufacturing cost is high and the strength is low, making it impractical. In addition, the rating is 1m for 4μ or more.
It is too thick to drill with a general thermal head of J/dot size. The porous support 25 of this embodiment is a porous thin paper mainly made of natural fibers such as Manila hemp, kozo, and mitsumata, synthetic fibers such as polyethylene terephthalate, polyvinyl alcohol, and polyacrylonitrile, and semi-synthetic fibers such as rayon. is used. The base paper 1 constructed as described above is wound so that the thermoplastic film 21 side faces outward in FIG. 1.

In addition, as shown in FIG. 4, the thermal head 7 is provided with
A convex glaze layer 51 is provided on which a heating resistor layer 52 is provided.
Place. Then, conductors 53a and 53b are arranged, and an anti-oxidation film 54 and a protective film 55 are further covered thereon. The heat generating portion 56 is a portion that transmits heat to the base paper 1.

Next, the operation will be explained with reference to FIGS. 1 and 2. As shown in FIG. 2(A), the platen 9 is rotationally driven in the direction of arrow A by a drive device (not shown), and the frictional force between the platen 9 and the base paper 1 causes the base paper 1 to be transferred to the original roll 3.
The thermal head 7 is pulled out and conveyed to a position facing the thermal head 7. Then, the thermal head 7 selectively heats and melts the thermoplastic film 21 side of the base paper 1 according to image information synchronized with the rotation of the platen 9, thereby forming a perforation image 74 on the base paper 1 and making a plate (Fig. (See 4 (b)).

The base paper 1 on which the perforated image 74 has been formed is conveyed until the perforated image area is entirely in close contact with the ink application surface of the ink pad 32 . In this way, with the perforated image area of the base paper 1 in close contact with the ink application surface of the ink pad 32, the thermoplastic film 2 of the base paper 1 is placed against the printing paper 33.
By pressing so that one side faces each other, the ink impregnated from the ink layer 27 inside the ink pad 32 passes through the porous support 25 of the base paper 1 and oozes out from the perforated portion, and the ink is applied to the printing paper 33. An image corresponding to the transferred perforation image is formed.

Furthermore, the base paper 1 that has been made into a plate is wound up by a winding torque applied in the direction of arrow B of the winding roll 5. This winding torque is applied to the winding roll 5 by a known sliding device (not shown). This sliding device is composed of a rotational drive section to which driving force is transmitted from the drive device for the platen 9 described above, and a clutch that transmits rotation by friction torque. In the sliding device configured in this way, when there is no clutch slipping, the winding roll 5
The circumferential speed of the platen 9 is set to be higher than that of the platen 9 at all times. Further, the friction torque of the clutch is set so that the tangential force of the take-up roll 5 is smaller than the friction force between the base paper 1 and the platen 9. Therefore, the clutch slips by the difference between the circumferential speed of the take-up roll 5 and the circumferential speed of the platen 9, and the friction torque of the clutch, that is, the take-up torque, is applied to the take-up roll 5.

Next, the electrical operation will be explained with reference to FIGS. 3, 4, and 5. Input the image using an input device (not shown),
When storing the image in RAM, if there are 4 or more dots (2×2 dot configuration) adjacent to each other as shown in FIG. Therefore, flags are set on those dots to identify them. As shown in FIG. 6(b), the identification flag is not set for the dot configurations of other dot combinations.

The thermal head 7 conducts (on, off) the current flowing through the conductors 53a and 53b as shown in FIG.
By adjusting the time, the temperature of the heat generating part 56 of the thermal head 7 can be changed. That is, if the time from when the current flows until it turns off is t1, the temperature becomes T1, but when the time from when the current flows until it turns off is increased to t3, the temperature becomes T3, which is higher than T1. By adjusting the time of the current flowing through the conductors 53a and 53b in this way, the thermoplastic film 2 of the heat-sensitive stencil paper 1
The energy given to 1 can be adjusted.

Furthermore, this temperature change is highest at the center of the heat generating portion 56 of the thermal head 7, and the temperature distribution becomes lower and wider toward the periphery, so as the temperature is increased,
As shown in b), it can be seen that the energy applied to the thermoplastic film 21 also increases, and the area where the thermoplastic film melting energy value 73 is reached spreads out from the center of the perforation.

That is, as shown in FIG. 4A, when the energy value is 72, the area where the thermoplastic film melting energy value reaches 73 is small, and when the energy value is 70 hours, the area where the thermoplastic film melting energy value is 73 is large. In this way, the energy of the heat generation amount of the thermal head 7,
In other words, the conduction (On, O) of the current flowing through the conductors 53a, 53b
ff) By adjusting the time, it is possible to arbitrarily change the size of the perforations in the heat-sensitive stencil paper.

Therefore, the input image is transferred to the thermal head 7.
When drilling holes in Figure 5 (b), dots without flags
The perforation shape 74 is made large with a large energy 70 as shown in FIG. Due to the above,
When perforating and printing the shadow character H in Figure 6, Figure 6
Since the perforation shape 74 is large in the C part of FIG. 6 and the perforation shape 74 is small in the D part in FIG.

[0022] Therefore, excess ink due to the overlapping portion is eliminated, and the ink dries quickly. As described above, the present invention is not limited to these embodiments in any way, and may be implemented in various forms without departing from the gist of the present invention. For example, the perforation shape can be controlled not only in two stages but also in multiple stages using an intermediate perforation shape in the energy medium 71 as shown in Fig. , or a polygonal shape.

[0023] In addition, when setting the above identification flag, 2
The configuration is not limited to only the ×2 dot configuration, and other configurations such as a 3×3 dot configuration may also be used.

[0024]

[Effect of the invention] As is clear from the detailed description above,
The stamp device of the present invention controls the thermal head to form small-shaped perforations in areas where perforations are densely packed, so a large amount of ink does not adhere to the printing paper, the finished product dries quickly, and it is easier to use. It is possible to perform high-quality printing without staining the images.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a stamp device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the stamp device of the first embodiment and the stamp device of the first embodiment;
FIG. 2 is a cross-sectional view of the heat-sensitive stencil paper of Example.

FIG. 3 is a diagram showing the relationship between thermal head conduction current time and heat generation temperature.

FIG. 4 is a cross-sectional view of the thermal head, a diagram of the relationship between its energy and heat generation, and a diagram of the drilling state due to the heat generation of the thermal head when the energy is small.

FIG. 5 is a diagram of a drilling state due to heat generation of the thermal head when the energy is medium, and a diagram of a drilling state due to heat generation of the thermal head when the energy is high.

FIG. 6 is a diagram showing the printing result of the shadow character H, an enlarged diagram of the printing state of the C part of the shadow character, and an enlarged diagram of the printing state of the D part of the shadow character.

FIG. 7 is a diagram showing the printing result of the shadow character H, and an enlarged view showing the printed state of the E part and F part of the shadow character.

FIG. 8 is a cross-sectional view and a perspective view of a stamp device of the prior art.

[Explanation of symbols]

1...Thermosensitive stencil paper 3…Motomaki roll 5... Winding roll 7...Thermal head 9...Platen 21...Thermoplastic film

Claims (1)

[Claims] 1. A transport means for transporting a heat-sensitive stencil paper made of a thermoplastic film and a porous support bonded together with an adhesive; a thermal head for perforating an image on the heat-sensitive stencil paper; A stamp device is provided on a porous support side of a stencil paper, and includes an ink pad impregnated with ink and a control means for controlling a thermal head so as to form perforations in a shape matching an image to be perforated.