JPH0516513A - Stencil printing machine - Google Patents

Abstract

PURPOSE:To provide a stencil printing machine of small and simple construction at low cost wherein intended ink color for printing can be easily changed. CONSTITUTION:If desired color of ink pad of users is blue, a motor 43 is driven to rotate a rotary ink pad holder 8 to a direction of arrow so that a blue color ink pad 22 is caused to face an image formation section of a heat-sensitive stencil original sheet 80. Further, the holder 8 is lowered by a motor unit 70 to bring the pad 22 into close contact with the original sheet 80 so that a holder provided in a frame 1 (not shown) is held and pressed against a printing sheet, etc., to perform printing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine.

[0002]

2. Description of the Related Art Conventionally, a rotary stencil printing apparatus is known as a stencil printing apparatus capable of changing a printing ink color. As an example of such an apparatus, Japanese Patent Publication No. 60-262
FIG. 5 shows a stencil printing apparatus disclosed in Japanese Patent No. 684.

This stencil printing machine comprises a machine frame 100, a rotation support member 101 rotatably provided on the machine frame 100,
The stencil sheet 1 attached to the rotation supporting member 101
No. 02 carrying base paper carrying rotating member 103 and ink supply means 10 for supplying printing ink to the stencil printing base paper 102.
4, a plurality of rotary stencil printing means 105, a press roller 106, and a rotary support member 101 are rotationally driven in a divided manner to selectively select one of the plurality of rotary stencil printing means 105. And a divisional rotation driving means 107 which is positioned at a printing work position corresponding to 106.

In this apparatus, the rotation supporting member 101 is divided and rotated by the division rotation driving means 107, and the rotary stencil printing means 105 corresponding to the press roller 106 is changed. Therefore, the rotary stencil printing means 105 used for stencil printing is changed, and each rotary stencil printing means 10 is changed.
If the ink supply means 104 of No. 5 were filled with printing inks of different colors, it was possible to print with the printing inks of different colors only by the divisional rotation drive of the rotation support member 101.

[0005]

However, in the above-mentioned stencil printing apparatus, since the rotary stencil printing means is provided for each printing ink, the structure and mechanism are complicated, and the apparatus itself becomes large and expensive. It was something.

The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a stencil printing apparatus which can easily change the ink color to be printed, has a simple structure, and is small in size and inexpensive. To aim.

[0007]

To achieve this object, a stencil printing machine of the present invention comprises an image forming means for forming a perforated image on a stencil sheet and a plurality of ink impregnated inks of different colors. Ink impregnating body supporting means for supporting the ink impregnating body, and from the plurality of ink impregnating bodies supported by the ink impregnating body supporting means, only the ink impregnating body of a desired color is selected, The image forming unit includes a selecting unit for facing the perforated image forming unit and a pressure bonding unit for pressing the selected ink impregnated body to the perforated image forming unit.

[0008]

In the stencil printing apparatus of the present invention having the above-mentioned structure, the perforated image is formed on the stencil base paper by the image forming means, and among the plurality of ink impregnated bodies supported by the ink impregnated body supporting means by the selecting means. From the above, only the ink impregnated body of a desired color is selected, and it is made to face the perforated image forming portion formed by the image forming means of the stencil sheet. And
Printing is performed by pressing the selected ink impregnated body to the perforated image forming portion by a pressing means and pressing it onto the paper or the like to be printed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

The stencil printing machine of this embodiment will be described with reference to FIG. The heat-sensitive stencil sheet 80 supplied from the supply roll 3 rotatably supported by the machine frame 1 is configured to be conveyed along the platen roll 4 and the guide roll 6 and wound on the take-up roll 7. ing. A thermal head 5 is provided so as to face the platen roll 4. Further, a stamp unit 60 movably supported in the vertical direction and a motor unit 70 for moving the stamp unit 60 are provided.

The stamp unit 60 is disposed on the stamp holder 2, an upper surface of the stamp holder 2, and a holder rack 36 having racks formed on both sides thereof, and is rotatably supported by the stamp holder 2 via bearings 44. ,
A rotary shaft 45 having a pulley 42 at one end, a rotary ink pad holder 8 fixed to the rotary shaft 45 and having four ink pad holding surfaces, and a rotary ink pad holder 8 fixed to the holding surfaces of the rotary ink pad holder 8, respectively. A red ink pad 20, a black ink pad 21, a blue ink pad 22, a green ink pad (not shown), and an ink pad of each color are selectively rotated on the ink application surface of a heat-sensitive stencil sheet 80 described later. The motor 43 is directly connected to the motor 43,
A motor pulley 41 that transmits power to the pulley 42 via the timing belt 40.

The motor unit 70 includes the left and right pinion gears 3 that engage with the racks of the holder rack 36, respectively.
2 and 33, and a gear 3 that is rotatably supported coaxially with the pinion gears 32 and 33 and engaged with each other.
0 and 31, and a vertical movement motor 35 that rotationally drives a motor gear 34 that is engaged with the gear 30.

The heat-sensitive stencil sheet 80 will be described with reference to FIG. The heat-sensitive stencil sheet 80 is made of the thermoplastic film 8
1, the adhesive layer 83, and the porous support body 85, and the thermoplastic film 81 and the porous support body 85 are bonded by the adhesive layer 83.

Thermoplastic film 81 in this embodiment
Is a polyethylene terephthalate film having a thickness of 2 μ (hereinafter abbreviated as PET film), but other examples thereof include films of polypropylene, vinylidene chloride-vinyl chloride copolymer and the like.

The thickness of the PET film is 1 μ to 4
μ is preferred. If it is less than 1 μm, the manufacturing cost is high and the strength is weak, which is not practical. On the other hand, if the thickness is 4 μm or more, a general thermal head having a rating of about 50 mJ / mm ² is too thick to punch. The porous support 85 is
For example, 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.

Next, the operation will be described.

First, the stamp unit 60 is moved from the state shown in FIG. 1 to the position shown in FIG. 2 by the motor unit 70.
Move by. This is because the gear 30 engaged with the motor gear 34 is driven by driving the vertical movement motor 35.
Is performed and the pinion gears 32 and 33 are rotated, so that the stamp holder 2 is moved upward. This state is the release state of the stamp unit 60 and the print preparation state. This state is maintained except during printing.

Next, the heat-sensitive stencil sheet 80 is pressed against the platen roller 4 by the thermal head 5, and the surface of the thermoplastic film 81 is selectively heated and melted according to the image information to form a perforated image for plate making. .. After plate making, the thermal head 5 is separated from the heat-sensitive stencil sheet 80.

Then, the image forming portion of the heat-sensitive stencil sheet 80 is conveyed to just below the ink pad. If the ink pad color desired by the user is blue, the rotating ink pad holder 8 is rotated in the arrow direction by rotating the motor 43, and the blue ink pad 22 faces the image forming portion of the heat-sensitive stencil sheet 80. Let Then, the rotating ink pad holding portion 8 is lowered again by the motor unit 70, whereby the blue ink pad 22 is pressed and brought into close contact with the heat-sensitive stencil sheet 80 as shown in FIG. Printing can be performed by holding a holder portion (not shown) and pressing it against printing paper or the like.

When the same stencil original is used repeatedly, this state is used as it is. When the ink pad color and the stencil original are changed, the heat-sensitive stencil sheet 80 is taken up by the take-up roller 7.
Then, the ink pad color to be selected is selected by the same operation as described above, the stencil sheet is made into a plate, and the same operation is performed.

As is clear from the above description,
The stencil printing apparatus according to this embodiment can easily change the ink color to be printed, has a simple structure, and is small and inexpensive.

The present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the spirit of the present invention.

For example, although the number of ink pads is four in this embodiment, the number is not limited to four, and the number can be increased more.

[0024]

As is clear from the above description, according to the present invention, it is possible to easily change the ink color to be printed, provide a simple structure, and provide a small and inexpensive stencil printing apparatus. You can

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a stencil printing apparatus of this embodiment during printing.

FIG. 2 is an overall configuration diagram of a stencil printing apparatus of this embodiment in a print preparation state.

FIG. 3 is a perspective view of the stencil printing machine with a machine frame removed.

FIG. 4 is a cross-sectional view of the heat-sensitive stencil sheet of this example.

FIG. 5 is a sectional view of a conventional stencil printing machine.

[Explanation of symbols]

 5 Thermal Head 8 Rotating Ink Pad Holding Section 20 Red Ink Pad 21 Black Ink Pad 22 Blue Ink Pad 60 Stamp Unit 70 Motor Unit 80 Thermosensitive Stencil Base Paper

Claims (1)

Claim: What is claimed is: 1. An image forming means for forming a perforated image on a stencil sheet, and an ink impregnated body supporting means for supporting a plurality of ink impregnated bodies impregnated with inks of different colors, respectively. Only the ink impregnated body of a desired color is selected from the plurality of ink impregnated bodies supported by the ink impregnated body supporting means, and is opposed to the perforated image forming part formed by the image forming means of the stencil sheet. A stencil printing apparatus comprising: a selection unit for causing the selected ink impregnated body to be pressure-bonded to the perforated image forming unit.