JPH08197822A - Thermal screen printing machine - Google Patents

Abstract

PURPOSE: To reduce the number of times of trial printing at an initial stage to the utmost by setting the ratio of the amt. of the ink infiltrated into an ink holding element to the void parts of the ink holding element before the impregnation with ink to a specific value or less. CONSTITUTION: A stamp part main body 4 is constituted of a hollow rectangular parallepiped frame member 26 made of a synthetic resin having a shallow recessed part 25 provided to the rear surface thereof, the ink holding element 27 impregnated with oily ink provided to the recessed part 25 of the frame member 26 and the thermal film 28 covering the rear surface of the ink holding member 27 and the outer periphery of the frame member 26 and bonded to the outer peripheral surface of the frame member 26 by an adhesive 29. The ratio of the amt. of the ink infiltrated into the ink holding element to the void parts of the ink holding element before the impregnation with ink is set to 1.5 or less. By this constitution, the excessive outflow of the ink infiltrated into the ink holding element by the slight compression force to the ink holding element is reduced and ink is properly transferred to an article to be printed through the perforations of a thermal film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive stencil printing apparatus which transfers ink to a material to be printed through dot-shaped holes of a heat-sensitive film.

[0002]

2. Description of the Related Art Conventionally, a stamp in which a company name, an address, and other various character strings are engraved on a rubber stamp surface can be printed or imprinted on the surface of a sheet (hereinafter, both are collectively referred to as printing). Has been done. Stamps of this type are expensive and take a long time from order to acquisition because they are usually made individually according to orders.

On the other hand, hitherto, by perforating infrared rays or a thermal head to form a desired dot pattern on a heat-sensitive stencil sheet, and allowing ink to permeate through the perforated group,
Those that print various patterns such as character strings, figures, and marks have been put into practical use.

The applicant of the present application, in Japanese Utility Model Laid-Open No. 5-74833, discloses a stencil printing plate mainly composed of the heat-sensitive stencil sheet and an ink holder impregnated with ink.
We have proposed a new stamp that replaces the conventional stamp in which the stamp face is made of rubber. In this stencil printing plate, an ink holder and a frame member surrounding the ink holder are bonded to an ink impermeable substrate, and a heat-sensitive stencil sheet is superposed on the surfaces of the ink holder and the frame member. It is a structure that is adhered.

When this stencil printing plate is applied to a stamp, the stencil printing plate is adhered to the lower surface of the base of the stamp member having a grip portion via a cushioning material, and the heat-sensitive stencil sheet is irradiated with infrared rays or A desired character string or the like is punched in a dot pattern with a thermal head. Then, by transmitting the ink in the ink holding body through the perforation group, it is possible to print a desired pattern of a character string or the like on the paper multiple times as in the case of a normal stamp.

Furthermore, the applicant of the present invention is the Japanese Patent Application No. 5-3296.
No. 57 proposes a stamping device including a stamping body and a heating punching device for forming a punching hole on the stamping surface of the stamping body.

The stamp body comprises a grip portion, a heat-sensitive stencil sheet, and an ink holder impregnated with ink.

[0008] In the above heating and punching device, a punching mounting portion for removably mounting a stamp body, a thermal head for forming a hole in the heat-sensitive stencil sheet of the stamp body, and the head for the heat-sensitive stencil sheet of the stamp body. A moving device that moves along, a keyboard that inputs characters and symbols, and a control device that controls the thermal head and the moving device so that the character string that is input based on the input data is punched on the heat-sensitive stencil sheet. It is configured.

According to the above stamping apparatus, the stamp body is provided with the heat-sensitive stencil sheet and the ink holder, and the pattern of the desired character string is punched on the stamp face portion of the stamp body by the thermal head. Since the ink is automatically supplied from the ink holder inside the stamp body to the printing surface portion, printing can be performed without applying external ink to the printing surface portion. Further, if necessary, different patterns can be punched in the stamp face portion, so that it is not necessary to wait a long period from ordering to obtaining, unlike a conventional rubber stamp.

[0010]

In each of the above heat-sensitive stencil printers, printing can be performed as many times as possible,
Moreover, it is desirable that printing can be repeatedly performed at short time intervals. Therefore, it is necessary to impregnate the ink holder with as much ink as possible.

However, if the ink holder is impregnated with too much ink, a large amount of ink in the ink holder flows out and stains the paper to be printed because a compressive force acts on the ink holder during printing. Sometimes.

Further, in the apparatus proposed in the above-mentioned Japanese Patent Application No. 5-329657, when a desired character string pattern is punched in the stamp face portion 33 of the stamp body 4 by the thermal head 90, as shown in FIG. Since the thermal head 4 is moved while pressing the printing surface portion 33, the printing surface portion 33 is recessed by the thermal head 4 and the ink-ink holder 27
It becomes a state of being squeezed. As a result, the heat-sensitive stencil sheet 2
Ink flows out from the perforated hole 28a of 8 and adheres to the surface of the heat-sensitive stencil sheet 28 (in this state,
7a), this ink will stain the printing paper.

In order to avoid these situations, it was necessary to carry out many trial prints to clean the ink adhering to the surface of the heat-sensitive stencil sheet.

Further, at the time of manufacture, the ink holder 2 is placed in the recess 25 of the frame member 26 with the state shown in FIG. 22 turned upside down.
7. After mounting the heat-sensitive stencil sheet 28, it is turned upside down and the periphery of the heat-sensitive stencil sheet 28 is bonded to the frame member 26 with the adhesive 29. Before this upside down, the frame member 26 and the heat-sensitive stencil sheet 28 are sandwiched by a jig, and a compressive force is applied to the ink holder 27. At this time, if the ink holder is impregnated with a large amount of ink, the ink drips to the side of the frame member 26, and the periphery of the heat-sensitive stencil sheet cannot be bonded to the frame member 26.

However, in order to solve the above problem, if the amount of ink impregnated in the ink holder is reduced, the number of times printing can be performed is reduced, and the cycle from one printing to the next printing at substantially the same density is reduced. become longer. Moreover, if the printing surface is left vertical (that is, the stamp is laid sideways) for a long time, the impregnated ink is offset due to gravity, which causes uneven printing.

According to the present invention, the amount of ink impregnated in the ink holder is optimized to reduce the number of initial test prints as much as possible, to improve the printing result, and to minimize ink dripping during manufacturing. It is intended to improve quality. Furthermore, it is possible to reduce the occurrence of uneven density in the printed result.

[0017]

In order to solve the above problems, the present invention provides an ink holder made of a porous elastic material for impregnating and holding ink, and a flexible thin film which is perforated in a dot pattern. In a heat-sensitive stencil printing apparatus that overlaps a heat-sensitive film made of a material and transfers the ink impregnated in the ink holder to a material to be printed through the holes of the heat-sensitive film, the space inside the ink holder before being impregnated with the ink The ratio of the amount of ink impregnated in the ink holder with respect to the hole is set to about 1.5 or less.

Further, in the present invention, preferably, the ratio of the amount of ink impregnated in the ink holding body to the void portion in the ink holding body is set to about 0.5 or more.

In the present invention, preferably, the ratio of the amount of ink impregnated in the ink holding body to the pores in the ink holding body is determined by MI / (V × γs-Ms).

However, MI = weight of ink impregnated in the ink carrier V = volume of the ink carrier before being impregnated with ink γs = specific gravity of the material of the ink carrier Ms = weight of the ink carrier.

Further, in the above constitution, preferably, the ink holder is made of polyurethane foam, and the heat sensitive film is made of a thermoplastic film having a thickness of 1 to 4 μm.

The present invention preferably further comprises an ink impermeable rigid frame member which cooperates with the heat sensitive film to sandwich the ink holding body,
The periphery of the heat sensitive film is fixed to the periphery of the frame member so that the ink holder is substantially sealed.

In the present invention, preferably, the stamp body that further supports the heat-sensitive film and the ink holder, a perforating head that thermally perforates the heat-sensitive film in a desired dot pattern, and the perforating head thereof. And a pressing means for pressing the heat-sensitive film against the elasticity of the ink holding body from the side opposite to the ink holding body.

The present invention preferably further comprises a moving means for moving the head relative to the stamp body along the heat sensitive film while being pressed by the pressing means.

In the present invention, the stamp body is preferably removable from the head.

In the present invention, preferably, the stamp body further has a holder which can be held by a hand, an ink impermeable rigid frame member which supports the heat sensitive film and the ink holding body. With and
The frame member is attachable to and detachable from the holder together with the heat sensitive film and the ink holder.

Further, in the present invention, preferably, in the structure described at the beginning, preferably, a stamp body for supporting the heat-sensitive film and the ink holding body, and a heat-piercing for punching dot-shaped perforations on the heat-sensitive film of the stamp body. A heating punching device, wherein the heating punching device detachably mounts the stamp body, an inputting unit for inputting characters and symbols, and a data storage for storing the input data input from the inputting unit. Means, a punching means including a thermal head for punching a thermosensitive film of the stamp body mounted on the punching mounting portion in a dot pattern, and driving control of the punching means by receiving input data from the data storage means. Control means and the perforation means from the side opposite to the ink holding body against the elasticity of the ink holding body. A pressing means for pressing, a structure and a moving means for the moving stamp member relative along said thermal film the head while pressing with the pressing means.

[0028]

According to the present invention, the ratio of the amount of ink impregnated in the ink holding body to the pores in the ink holding body before being impregnated with the ink is set to about 1.5 or less by the above structure. The slight compression force applied to the ink holding body prevents the ink impregnated in the ink holding body from flowing out excessively, and allows the ink to be transferred almost properly to the printing object through the holes of the heat-sensitive film.

By setting the above ratio to approximately 0.5 or more, the printing cycle is sufficiently shortened and the number of times printing can be performed is increased. In addition, even when the printing surface is left vertical for a long time, the impregnated ink is not biased by gravity and uneven density is generated in the printing result.

Further, according to the present invention, in the above structure, the ink holding body is sandwiched between the ink impermeable rigid frame member and the heat sensitive film, and is substantially sealed, thereby maintaining the ink impregnation rate in the ink holding body. , Easy to handle when preparing for printing.

According to the present invention, in the above construction, the stamp body supports the heat sensitive film and the ink holder, and the punching head is pressed against the heat sensitive film from the side opposite to the ink holder against the elasticity of the ink holder. By heat-perforating the heat-sensitive film in a desired dot pattern, it is possible to manufacture a stamp desired by the user. On this occasion,
Compressive force acts on the ink holder, but by setting the ink impregnation rate as described above, the ink impregnated in the ink holder is prevented from flowing out excessively, and transfer to the printing material is good. To

Further, according to the present invention, by moving the head relative to the stamp body along the heat-sensitive film in the above structure, the compressive force on the ink holder is localized, and the outflow of ink from the ink holder is reduced.

Further, in the present invention, the stamp body can be attached to and detached from the head in the above construction, and after the stamp body is perforated in the heat-sensitive film, it is possible to print away from the head.

In the present invention, the ink-impermeable rigid frame member for supporting the heat-sensitive film and the ink holder can be attached to and detached from the stamp holder in the above structure, and a portion including the frame member can be attached. The replacement allows the new thermal film to be perforated and a new stamp to be produced.

According to the present invention, in the above construction, characters and symbols are inputted from the input means and stored in the storage means, and a dot pattern is formed by a thermal head on the heat-sensitive film of the stamp body mounted on the mounting portion for punching of the heating punching device. Perforate. Then, the stamp body is taken out from the heat punching device,
Similarly to the above, the heat sensitive film is pressed against the surface of the printing material to transfer the ink of the ink holder to the printing material.

[0036]

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

The heat-sensitive stencil printing machine according to this embodiment comprises a stamp body 1 shown in FIGS. 1 to 8 and a heat punching machine 50 shown in FIGS.

First, regarding the stamp body 1, FIG.
This will be described with reference to FIGS.

As shown in FIGS. 1 to 4, the stamp body 1
Is a holder part 2 for grasping by hand, and this holder part 2
The stamp portion 3 fixedly connected to the stamp portion 3, the skirt member 6 covering the outer peripheral side of the stamp portion 3, and the protective cap 7 detachably attached to the stamp portion 3.

The holder portion 2 is formed of a rectangular parallelepiped hollow body made of a metal or a synthetic resin material with an open lower surface, and a recess 11 for attaching the label 10 is formed on the top of the holder portion 2. A pair of engaging claws 14 projecting downward are provided on the lower ends of the front wall 12 and the rear wall 13, respectively. A guide groove 15 is formed in the lower portion of the front wall 12 and the rear wall 13, an engagement recess 16 is formed in the front wall 12, an engagement hole 18 is formed in the left side wall 17, and a holder is formed. A spring support portion 20 is formed in the center of the lower surface of the upper wall 19 inside the portion 2.

The stamp part 3 is composed of a stamp part body 4 and an outer peripheral holding member 5 which is a rectangular parallelepiped hollow body having an opened lower surface for accommodating the stamp part body 4. The outer periphery holding member 5 has an upper portion on the outer periphery side of the stamp body 4 of about 2 /
It covers the three parts and engages with the four engaging claws 14 of the holder part 2 to be detachably fixed to the holder part 2.

The stamp body 4 has a shallow concave portion 25 on the lower surface side and is a rectangular parallelepiped hollow frame member 2 made of synthetic resin.
6, an ink holder 27 impregnated with an oil-based ink that is mounted in the recess 25 of the frame member 26, and an ink holder 27
And a heat-sensitive film 28 that covers the outer peripheral side of the frame member 26 and is adhered to the outer peripheral surface of the frame member 26 with an adhesive 29. The ink holder 27 may be adhered to the recess 25 of the frame member 26 with an adhesive or the like.

The frame member 26 is a synthetic resin material (for example, vinyl chloride, polypropylene, polyethylene, polyacetal, polyethylene terephthalate, etc.) or a metal material that is excellent in oil resistance and impermeable to ink and has rigidity because it contacts oily ink. And the concave portion 2 of the frame member 26.
By mounting the ink holding body 27 on the nozzle 5, the positional deviation of the ink holding body 27 is prevented and the outflow of ink from the ink holding body 27 is prevented.

The ink holder 27 is preferably made of a non-woven fabric of porous and elastic polyurethane foam.
Or other synthetic resin material (eg polyethylene,
Polypropylene, polyethylene terephthalate, acrylonitrile-butadiene rubber, etc.) is a porous and elastic foam or non-woven fabric. The ink holder 27 is impregnated with an oil-based ink.
When pressure is applied to 7, the ink will seep out.

The heat-sensitive film 28, as shown in FIG.
It is composed of a thermoplastic film 30, a porous support 31, and an adhesive layer 32 for adhering them together to form a flexible thin film. The thermoplastic film 30 has a thickness of 1 to 4 μm, preferably 1.8 μ, which can be perforated by heating and melting.
m thermoplastic synthetic resin material (for example, polyethylene terephthalate, polypropylene, vinylidene chloride-vinyl chloride copolymer, etc.). Thickness 1
If the thickness is less than μm, it is not practical because the manufacturing cost is high, the strength is weak, and it is not practical, and if the thickness is 4 μm or more, it is too thick and the rated output is about 50 mJ / mm ^2. The head cannot be drilled.

The porous support 31 is made of natural fibers (for example,
Manila hemp, kozo, mitsumata, etc.), synthetic fibers (eg,
Polyethylene terephthalate, polyvinyl alcohol,
Polyacrylonitrile etc.) or semi-synthetic fiber such as rayon as a main raw material. Since the main purpose of the porous support 31 is to supplement the strength of the perforated thermoplastic film 30, it is 50 μm in this embodiment.
It is about the thickness.

As shown in FIG. 6, with the frame member 26 turned upside down, the ink holding body 27 is mounted in the recess 25 thereof, and then the ink holding body 27 is impregnated with the oil-based ink. From above 27, the heat sensitive film 28 is covered so that the porous support 31 is on the ink holding body 27 side, and the heat sensitive film 28 is adhered to the surface of the ink holding body 27. The stamp portion main body 4 shown in FIG. 7 is obtained by tightly folding the outer peripheral surface of the frame member 26 and adhering it with the adhesive layer 29.

Surface of ink holder 27 (lower surface in FIG. 5)
The portion of the heat-sensitive film 28 that is in close contact with is a stamp surface portion 33. As described above, since the outer peripheral side portion of the heat sensitive film 28 is adhered to the outer peripheral surface of the frame member 26, the stamp surface portion 33 covering almost the entire lower surface of the stamp portion 3 is adopted.
Could be formed. As a result, positioning when printing is simplified.

As shown in FIGS. 2 to 4, the outer periphery holding member 5
Is a peripheral wall portion 34 forming a rectangular parallelepiped hollow body having an open lower surface.
And an upper wall portion 35 and a pair of left and right engaging wall portions 36 protruding from the upper wall portion 35 by a predetermined height. The stamp main body 4 is inserted inside the peripheral wall 34, and the upper wall 3
The outer peripheral holding member 5 and the stamp portion main body 4 are fixed to each other by thermally caulking the pin 26a protruding from the frame member 26 on the wall portion 35a located at the central portion of 5.

Engagement holes 37 corresponding to the four engagement claws 14 of the holder portion 2 are formed in the pair of left and right engagement wall portions 36. The pair of left and right engagement wall portions 36 are slidably inserted from below into the pair of left and right rectangular holes 42 of the upper wall portion 41 of the skirt member 6 so that the four engagement holes 37 are formed.
The outer peripheral holding member 5 is detachably fixed to the holder portion 2 by engaging the four engaging claws 14 from above and bringing the upper end of the engaging wall portion 36 into contact with the lower end of the holder portion 2. ing.

As shown in FIGS. 2 to 4, the skirt member 6
Is an outer peripheral wall portion 40 formed of a rectangular parallelepiped hollow body having an open lower surface, and an upper wall portion 35 of the outer peripheral holding member 5 at the upper end thereof.
An upper wall portion 41 located above, a gate-shaped portion 43 that protrudes upward a predetermined height from the center portion of the upper wall portion 41 and is inserted into the holder portion 2, and a center of an upper end of the gate-shaped portion 43. It is composed of a spring support portion 45 and the like protruding from the portion. Outer wall 40
The outer peripheral wall portion 34 of the outer peripheral holding member 5 is fitted in the inside of the so as to be slidable in the vertical direction. Guide holes 18 are formed in the lower portions of the left and right wall portions of the gate-shaped portion 43 so as to penetrate the both wall portions.
Corresponding to the guide hole 44 is formed.

The skirt member 6 is configured to be movable up and down with respect to the holder portion 2 and the stamp portion 3.
With the compression spring 21 mounted between the spring support portion 20 of the skirt member 6 and the spring support portion 45 of the skirt member 6, the holder portion 2
Further, the stamp portion 3 is urged downward. The lower end of the central portion of the four sides of the outer peripheral wall 40 of the skirt member 6 is
The protective cap 7 is partially removed, and the protective cap 7 is attached / detached and the stamp face 3
It is easy to position 3.

The protective cap 7 is for removably covering and protecting the lower end side of the stamp body 4, and the outer peripheral wall portion 48 thereof has the same shape as the outer peripheral wall 34 of the outer peripheral holding member 5 when seen in a plan view. Is formed in. This protective cap 7
It is fitted in the outer peripheral wall portion 40 of the skirt member 6 and supported by frictional force. As shown in FIGS. 3 and 4, when the protective cap 7 is mounted, the upper end of the protective cap 7 contacts the lower end of the outer peripheral wall 34, and a small gap is formed between the protective cap 7 and the stamp face portion 33. Even if the holder portion 2 is pushed downward with the protective cap 7 attached, the above-mentioned gap is maintained by the contact between the upper end of the protective cap 7 and the lower end of the outer peripheral wall 34. Will not adhere.

For example, as shown in FIG. 8, a character string of mirror characters of "BCDE Industry Co., Ltd."
A large number of perforations (dot pattern perforations) formed by a six-fold rectangular frame that surrounds the outer side of the frame are formed by a thermal head of a thermal printer to be described later, and like a normal stamp having a rubber stamp surface portion, The pattern can be printed.

As for the method of using the stamp body 1, the protective cap 7 is removed, the skirt member 6 is applied to the printing material (paper), and the stamp surface portion 33 is positioned with respect to the printing material. At this time, as shown in FIG. 3, the skirt portion 6 is located at a position where the lower end of the skirt portion 6 projects below the stamp surface portion 33 of the stamp portion 3 by the bias of the spring 21.

After that, the holder portion 2 is grasped and the holder portion 2
7 is pushed downward, the holder portion 2 and the stamp portion 3 are lowered with respect to the skirt portion 6 and the stamp surface portion 33 is pressed against the printing object as shown in FIG. The pressing force compresses the ink holder 27, and the ink in the ink holder 27 exudes from a large number of perforations in the heat-sensitive film 28, so that the perforation pattern can be printed on the surface of the substrate.

After printing, when the pressing force applied to the holder 2 is released, the spring 21 urges the stamp face 33.
Is peeled off from the printing object. When the skirt member 6 is not used, the lower end of the skirt member 6 is again projected below the printing surface portion 33 of the stamp portion 3 by the bias of the spring 21.
Supports the stamp body 1 as a whole and protects the stamp face portion 33.
The stroke of the skirt member 6 is preferably set to about 5 mm.

The stamp part 3 is an engaging claw 14 of the holder part 2.
You can remove it and replace it with a new one.

Even if the skirt portion 6 moves up and down, the outer peripheral holding member 5 keeps the skirt portion 6 apart from the heat sensitive film 28, and the protective cap 7 is fitted and supported by the skirt portion 6, so that the heat sensitive film 28 is not supported. It is possible to prevent the outer peripheral portion from being damaged by friction.

The amount of ink impregnated in the ink holder 27 is excessive when the printing is performed or when the heat sensitive film 28 is perforated as will be described later, and the printed material is contaminated or the amount of the ink is too small. It must be proper so that the printing cycle does not become long. As shown in Table 1, the tests were carried out by changing the amount of the ink impregnated in the ink holder 27 variously.

In the table, "impregnation rate" is determined by MI / (V × γs-Ms). However, MI = weight of ink impregnated in the ink holder V = volume of ink holder before impregnation with ink γs = specific gravity of material of ink holder Ms = weight of ink holder

In the above formula, the impregnation rate is calculated from the ratio of the weight of the ink holding body corresponding to the holes of the ink holding body to the weight of the ink, but the pores in the ink holding body before being impregnated with ink are calculated. It can also be calculated from the ratio of the volume of the part to the volume of the ink. In the latter case, since the specific gravities of the ink and the ink holder are almost 1, the former formula can be used as a substitute for the calculation.

When the liquid is impregnated, the elastic porous material such as the ink holder 27 expands in volume, so that it is possible to store an ink amount exceeding the volume of the pores before impregnation with ink, In some cases, the impregnation rate in the table exceeds 1.

"Ink deviation" means "printing time (time for pressing the stamp portion against the printing object after leaving the printing surface having a size of 14 mm x 79 mm for one month with the longitudinal direction set vertically. ) Indicates the number of times that continuous printing was performed at 0.5 seconds and a printing cycle of 5 to 10 seconds without causing uneven density due to ink deviation.

"Printing endurance count" means that the printing time is 0.5 seconds,
The printing cycle is 5 to 10 seconds, and the number of times that continuous printing is possible without causing blurring is shown.

The "number of times of trial printing at the time of punching" indicates the number of times of trial printing until the ink (27a in FIG. 22) attached to the printing surface can be cleaned at the time of punching by the thermal head as described later.

“Ink dripping during manufacturing” means that the ink holder 27 and the heat-sensitive film 28 are placed on the frame member 26 as shown in FIG. 6, and then the periphery of the heat-sensitive film 28 is turned upside down to adhere to the frame member 26. Before that, the frame member 26 and the heat sensitive film 28 are sandwiched by a jig, and a compressive force is applied to the ink holder 27. At that time, when the ink dripped from the ink holder to the side of the frame member 26, the periphery of the heat-sensitive film could not be adhered to the frame member 26, so the ink drooping condition was confirmed.

[0068]

[Table 1]

As is clear from the table, when the impregnation rate is less than 0.5, the unevenness of the density due to the deviation of the ink when the printing surface is placed vertically is severe, and the printing durability is low, which is not suitable for practical use. When the impregnation rate is greater than 1.5, the amount of ink flowing out to the printing surface portion at the time of punching is large, and clear printing cannot be performed even if the trial printing is performed many times. In addition, ink often drops on the frame member 26 during manufacturing, and many defective products are produced. This is also not suitable for practical use and manufacturing.

When the impregnation rate is approximately 0.5 to 1.5, uneven density due to ink deviation, the number of printing durability, the number of test printings during perforation, and ink dripping during manufacturing are considerably improved, and practical use is endured. It became so.

When the impregnation rate is approximately 0.75 to 1.25, the uneven density due to the deviation of the ink has almost no effect up to about 100 to 500 times, and the number of times of trial printing is about several times. No problem at all. It has sufficient performance for practical use.

Further, when the impregnation rate becomes approximately 0.9 to 1.25, uneven density due to the deviation of the ink is 500 to 100.
It has no effect up to about 0 times, and the durability has been further improved, making it practically comfortable to use, and there is no problem in manufacturing.

Next, the heat punching device 50 will be described.

As shown in FIGS. 9 to 11, the heat punching device 50 includes a body frame 51, a keyboard 52 and a display device such as a liquid crystal display 53 provided on the front portion of the body frame 51, and a rear portion of the body frame 51. It is composed of a heating perforation section 54 provided inside and a control means, that is, a control unit provided inside the main body frame 51.

The keyboard 52 has an input means such as a character / symbol key 5 including a plurality of character keys and a plurality of symbol keys.
6, various function keys (cursor movement key 5
7, execute key 58, line feed key 59, enter / end key 6
0, a cancel key 61, a delete key 62, a shift key 63, a lowercase switch 64, a character type setting switch 65, a punching switch 66, etc.) and a main switch 67 are provided. The liquid crystal display 53 is configured to be able to display a plurality of lines of character strings corresponding to a pattern to be printed by the stamp body 1.

As shown in FIGS. 11 to 19, the heating perforation section 54 includes a sub-frame 70, a perforation attachment section 71 for detachably attaching the stamp body 1, and a perforation attachment section 71. The stamp face portion 33 of the mounted stamp body 1 is provided with a heating punching mechanism 72 and the like for punching in a dod pattern shape.

Explaining the perforating mount 71, as shown in FIGS. 14, 15 and 17, the sub-frame 70 is used.
The right side wall 73 has an opening 74 having substantially the same shape as the side shape of the lower half of the stamp body 1 in which the stamp part 3 having the maximum width in the front-rear direction is mounted, and an opening / closing door 75 for opening and closing the opening 74. 14, a sector gear 76 is fixedly provided, and the opening / closing door 75 and the sector gear 76 are pivotally attached to the right side wall 73 in the front-rear direction by a pivot shaft 77 oriented in the left-right direction in FIG. A pair of front and rear parallel guide members 78 and 79 are provided on the upper portion of the sub-frame 70, and guide portions 80 extending horizontally and in parallel in the left-right direction are provided at the lower ends of the guide members 78 and 79 so as to face each other. Has been formed.

The front guide member 78 is provided with a pair of right and left rollers 81 through a long hole so as to be movable in the front-rear direction in FIG. 14 by a small distance. Energized towards 79.

The guide bar 83 having one end fixed to the front guide member 78 extends toward the opening 74 at an intermediate position between the guide members 78 and 79. As shown in FIGS. 14 and 18, on the upper surface of the right end portion of the guide bar 83, a taper surface 84 that is inclined downward to the right is formed, and at the left end portion of the guide bar 83, the left limit position of the stamp body 1 is located. A locking portion 85 for restricting is formed.

The stamp body 1 is inserted through the opening 74, and is inserted into the pair of front and rear guide grooves 15 of the holder portion 2 of the stamp body 1.
The stamp body 1 is supported by the pair of guide portions 80 by engaging the pair of front and rear guide portions 80.
Is urged toward the rear guide member 79 by a spring 82 via a pair of rollers 81, and the position in the front-rear direction is accurately set. Further, the horizontal position of the stamp body 1 is accurately set in a state in which the stamp body 1 is in contact with the locking portion 85 and the right roller 81 is engaged with the engagement concave portion 16 of the holder portion 2.

When the stamp body 1 is mounted on the perforation mounting portion 71, the guide bar 83 is inserted through the guide holes 18, 44, 44 of the stamp body 1 and, as a result, FIG.
As described above, the skirt member 6 is held in a state in which the lower end of the skirt member 6 is raised above the stamp surface portion 33.

Explaining the heating punching mechanism 72, the heating punching mechanism 72 is a thermal head 90 as punching means.
And a moving means for moving the head 90 along the stamp surface portion 33 of the stamp body 1 and a pressing means.

First, the moving means will be described. As shown in FIGS. 11 to 19, the thermal head 90 is provided below the perforation mounting portion 71, over the right end wall 73 and the left end wall 86 of the subframe 70. Carriage 8
A guide rod 8 extending in the left-right direction for guiding the 7
8,89 are installed. A cam body 91 for switching the position of the thermal head 90 is mounted on the rod 89 so as to be non-rotatable and slidable in the axial direction. The rod 89 serves as a head switching rod and directs the head 90 toward the printing surface portion 33 of the stamp body 1. It has a part of the function of pressing means for pressing.

The carriage 87 is supported by a guide rod 88 and a head switching rod 89 so as to be movable in the left-right direction, and a rack 92 having a predetermined length in the moving direction is formed at the front end of the carriage 87. There is.

The thermal head 90 is fixed on the head heat dissipation plate 94. The head heat dissipation plate 94 is the cam contact plate 9
3 together with the support shaft 95 in the front-rear direction on the carriage 87.
It is mounted so that it can swing up and down. Head heat sink 9
4 is urged upward by a spring 97 mounted on a pin 96 fixed to the cam abutting plate 93.

The cam body 91 is formed into an elliptical shape and abuts against the lower surface of the cam abutment plate 93, and the head switching rod 8
When the cam body 91 is turned to the sideways posture by rotating 9, the thermal head 90 moves downward together with the head heat dissipation plate 94 and separates from the stamp face portion 33 of the stamp body. The cam body 91
When is set to the upright posture, the thermal head 90 swings upward through the cam contact plate 93 and the spring 97 and approaches the stamp face portion. That is, the head 90 includes the pressing means, that is, the head switching rod 89, the cam body 91, and the cam contact plate 93.
The spring 97 presses the stamp face 33 or separates it from the stamp face 33.

A gear 98 meshed with the sector gear 76 is provided outside the right end wall 73 of the sub-frame 70 at the right end portion of the head switching rod 89, and when the opening / closing door 75 is opened, the cam body 91 is in a sideways posture. , Door 75
When is closed, the cam body 91 is switched to the vertical posture.

On the front wall 99 of the sub-frame 70, a stepping motor 100, a drive gear 101 meshed with the rack 92, and a reduction gear mechanism 102 for transmitting the rotation of the output gear 102 of the output shaft of the stepping motor 100 to the drive gear 101. And are attached. Therefore, the rotational drive force of the stepping motor 100 is decelerated and transmitted to the drive gear 101, and the carriage 87 can be moved and driven in the left-right direction.

The thermal head 90 is the same as the thermal head of an ordinary thermal printer, and the heat-sensitive film 28 is perforated in a dot pattern when each of a large number of heating elements generates heat. This thermal head 90
As shown in FIG. 21, for example, 96 heating elements 103 are arranged in a line in a direction substantially perpendicular to the moving direction of the carriage 87. This heating element 1 consisting of 96 pieces
The length of 03 is the stamp face portion 33 of the stamp portion 3 of the maximum size.
Approximately equal to the width dimension of.

Next, a control system including the control unit 110 for driving and controlling the heating punching mechanism 72 and the liquid crystal display 53 will be described.

As shown in FIG. 20, the control unit 110
Includes a keyboard 52, a thermal head 90, a carriage feed motor 100, a liquid crystal display 53,
Two proximity switches 104 and 105 for detecting the presence or absence of the stamp portion 3 of the stamp body 1 and the front-back width are connected.

In the case of the present embodiment, the stamp portion 3 of the stamp body 1 is of the narrow width type shown by the solid lines in FIGS.
There are two types of wide type shown by a chain line, and the two proximity switches 104 and 105 are attached to a plate piece 106 fixed to the lower surface of the rear guide member 79, as shown in FIGS. 11, 13, and 17. Then, the proximity switches 104 and 105 detect the wide-width stamp body 1, and the proximity switch 104 detects the narrow-width stamp body 1.

As shown in FIG. 20, the control unit 110
Include a CPU 111, a ROM 112, a data storage means, that is, a RAM 113, and a punching CG-ROM 114.
And a display CG-R for displaying on the display 53
OM115, keyboard 52 and proximity switch 10
An input interface 116 connected to 4, 105;
An output interface 117 is provided and these are connected to each other by a bus 118. Further, in the control unit 110, a head drive circuit 119 and a motor drive circuit 120, which are connected to the output interface 117, respectively.
And a display drive circuit 121.

The heating and punching device 50 is stored in the ROM 112.
A program memory 122 storing a control program for controlling the overall operation of the computer and a dictionary memory 123 for kana / kanji conversion are provided.

The RAM 113 is provided with an input buffer 124 for storing input data, a punching buffer 125 for storing punching data, a shift register 126, and various other counters and registers.

In the punching CG-ROM 114, dot pattern data of many characters to be punched is stored in association with the code data, and the display CG-ROM 1 is also stored.
Display dot pattern data of a large number of characters to be punched is stored in 15 in association with code data.

Next, the head drive circuit 119 will be described.

As shown in FIG. 21, one electrode of each heating element 103 is connected to a + 12V power supply terminal 127, and the other electrode is connected to a driver 128. The input terminal of each driver 128 includes the output terminal of the inverter 129 whose input side is connected to the punching strobe input terminal 130 and the output terminal of the data latch circuit 132 whose input side is connected to the latch signal input terminal 131. It is connected. Further, the data latch circuit 1
Each input terminal of 32 is connected to each output terminal of the shift register 135 whose input terminals are connected to the clock input terminal 133 and the data input terminal 134.

In the head drive circuit 119, the punch register data is stored in the shift register 135 in synchronization with the clock signal. After that, when the latch signal is supplied to the data latch circuit 132, the data is stored in the shift register 135. The data is output to and stored in the corresponding data latch circuit 132.

At the same time, the data is transferred to each driver 1
28 is applied. In this state, when a punching pulse signal of logic "0" is applied to the input terminal of the inverter 128 from the strobe input terminal 130 for punching, a signal of logic "1" is output from the output terminal of the inverter 128 and each driver 128 is output. Applied to the input terminal of.

Therefore, when the data of the data latch circuit 132 is logic "1", the output side of the driver 128 is logic "0", and the drive current is supplied from the power supply terminal 127 to the corresponding heating element 103. . At that time, the pulse width of the perforation pulse signal input to the perforation strobe input terminal 130 is set so that the surface temperature of the heating element 103 becomes a temperature suitable for thermal perforation.

Next, a punching process for punching a pattern of a character string on the stamp face portion 33 of the stamp body 1 using the heating punching device 50 will be described.

When the main switch 67 is turned on, the carriage feed motor 100 is driven to perform the initial setting such as moving the carriage 87 to the initial position at the right end of the guide lot 88. The input setting of the print content is executed by operating the keyboard 52. In this input setting, the size designation of the stamp face part, the format input including the setting of the character size and the character arrangement, and the character string data for punching are performed. Input to the input buffer 124 is executed.

Next, the stamp body 1 is attached to the perforating attachment portion 71 through the opening 74. As the stamp body 1 is inserted through the opening 74, the guide bar 83 is inserted through the guide holes 18, 44, 44 of the stamp body 1 and is inserted into the tapered surface 84 of the guide bar 83 as shown in FIG. The gate-shaped portion 43 rises along the skirt member 6, and the lower end of the skirt member 6 is positioned above the stamp surface portion 33 as shown in FIG.
Further, the stamp body 1 abuts on the locking portion 85 of the guide bar 83, and the roller 81 engages with the engaging concave portion 16 of the holder portion 2 so that the stamp body 1 is arranged at a predetermined position in the perforating mounting portion 71. When the opening / closing door 75 is rotated counterclockwise in FIG. 17 to perform the closing operation, the sector gear 76 rotates in the same direction and the head switching rod 89 rotates in the direction in which the cam body 91 is in the upright posture. . Then, the thermal head 90 swings upward through the cam contact plate 93 and the spring 93, and is arranged at the punching position where the right end of the stamp face portion 33 of the stamp body 1 is pressed as shown by the solid line in FIG.

When the punching switch 66 is turned on, it is determined whether or not the stamp body 1 is attached, and whether or not the size of the stamp face portion and the size of the stamp body 1 that have been input match each other. In this case, the punching process is performed on the stamp face portion 33 of the stamp body 1. In the punching process, the dot pattern data for punching is created based on the format and the character string data for punching, which are stored in the punching buffer 125. The thermal head 90 is driven based on the dot pattern data stored in the punching buffer 125. The thermal head 90 is moved by the carriage 87 along the stamp face portion 33 while being pressed by the spring 97. In the carriage 87, the thermal head 90 has the printing surface 33.
Position to the left from (the position indicated by the chain double-dashed line in FIG. 19)
Up to this point, the thermal head 90 does not continue to press the printing surface 33 and cause ink to leak because it moves and stops.

As described above, the heat-sensitive film 28 is heated by the thermal head 90 to form a dot pattern. At this time, the ink holder 27 is the heat-sensitive film 2
22 is pressed by the thermal head 90 together with FIG.
Although it is dented in the same manner as the conventional one, that is, it is squeezed in the carriage movement direction while being locally compressed, the holes of the heat-sensitive film 28 are formed because the ink holder 27 is impregnated with an appropriate amount of ink as described above. A small amount of ink leaks from the ink, and the excess ink can be removed by a small number of test prints.

Here, a part of the above embodiment can be modified as follows.

1] The punching mounting portion 71 is formed by the stamp body 1.
Although it is configured to be detachably attached from the side, it may be detachably attached from above.

2] The heating punching mechanism 72 is configured to punch the thermal head 90 while moving the thermal head 90 via the carriage 87 while holding the stamp body 1 at a predetermined position. Alternatively, the stamp body 1 may be moved and punched.

3] A solenoid actuator may be provided instead of the cam body 91, and the position of the thermal head 90 may be switched by the actuator.

4] Instead of the rack 92, the drive gear 101, and the reduction gear mechanism 102, the carriage 87 may be moved and driven in the left-right direction via a wire and a pulley.

[0112]

As described above, according to the present invention, the ratio of the amount of ink impregnated in the ink holding body to the pores in the ink holding body before the ink impregnation is set to about 1.5 or less. As a result, the ink impregnated in the ink holder is less likely to flow out excessively by a slight compressive force on the ink holder, and the ink can be transferred almost properly to the printing material through the holes of the heat-sensitive film.

By setting the above ratio to approximately 0.5 or more, the printing cycle can be sufficiently short and the number of times printing can be performed can be increased. In addition, even when the printing surface is left vertical for a long time, the impregnated ink is not biased by gravity and uneven density is generated in the printing result.

Further, according to the present invention, in the above structure, the ink holder is sandwiched between the ink impermeable rigid frame member and the heat-sensitive film, and is substantially sealed, so that the ink impregnation rate in the ink holder is maintained for a long time. In addition, it can be easily handled when preparing for printing.

According to the present invention, in the above construction, the stamp body supports the heat sensitive film and the ink holder, and the punching head is pressed against the heat sensitive film from the side opposite to the ink holder, against the elasticity of the ink holder. Then, a stamp desired by the user can be manufactured by thermally perforating the thermosensitive film in a desired dot pattern. At the time of this perforation, a compression force acts on the ink holder, but by setting the ink impregnation rate as described above, it is possible to reduce the excessive outflow of the ink impregnated in the ink holder, and It is possible to reduce the number of initial test prints for removing the formed ink.

Further, in the present invention, by moving the head relative to the stamp body along the heat-sensitive film in the above structure, the compressive force on the ink holder is localized, and the outflow of ink from the ink holder during perforation is reduced. it can.

Further, according to the present invention, the stamp body can be attached to and detached from the head in the above-mentioned structure, and after the heat-sensitive film is perforated, the stamp body can be separated from the head and easily printed on an object to be printed.

Further, in the present invention, in the above structure, an ink impermeable rigid frame member supporting the heat sensitive film and the ink holder can be attached to and detached from the holder of the stamp body, and a portion including the frame member can be attached. By exchanging, a new thermal film can be perforated and a new stamp can be manufactured.

Further, according to the present invention, in the above construction, characters or symbols are inputted from the input means and stored in the storage means, and the dot pattern is formed by the thermal head on the heat-sensitive film of the stamp body mounted on the perforation mounting portion of the heat perforation apparatus. By punching in a circular shape, a stamp desired by the user can be input and manufactured through the input means. Then, the stamp body can be taken out from the heating and punching device and easily printed on the object to be printed in the same manner as described above.

[Brief description of drawings]

FIG. 1 is a perspective view of a stamp body of a heat-sensitive stencil printing apparatus according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a stamp body.

FIG. 3 is a vertical sectional front view of a stamp body.

FIG. 4 is a vertical sectional side view of a stamp body.

FIG. 5 is an enlarged sectional view of a heat-sensitive film of a stamp body.

FIG. 6 is a perspective view illustrating a method of manufacturing the stamp main body.

FIG. 7 is a vertical cross-sectional front view of a stamp body when printing on a printing material.

FIG. 8 is a diagram showing an example of a pattern for punching a stamp face of a stamp body.

FIG. 9 is a perspective view of a heat punching device of the stamp device.

FIG. 10 is a perspective view of a heat punching device and a stamp body.

FIG. 11 is a plan view of the heating punching device.

FIG. 12 is a partially cutaway front view of the heating punching device.

FIG. 13 is a partially cutaway vertical side view of the heating punching device.

FIG. 14 is a perspective view of a heating punching unit of the heating punching device.

FIG. 15 is a perspective view of an essential part of a heating punching unit of the heating punching device.

FIG. 16 is an exploded perspective view of a heating and punching mechanism.

FIG. 17 is a side view of a main part of a heating punching unit of the heating punching device.

FIG. 18 is a vertical cross-sectional front view of the stamp body and the heating punching part being mounted on the mounting part for punching.

FIG. 19 is a vertical cross-sectional front view of the stamp body and the heat punching unit after being attached to the punching attaching unit.

FIG. 20 is a block diagram of a control system of the heat-sensitive stencil printing apparatus.

FIG. 21 is an electric circuit diagram of a head drive circuit.

FIG. 22 is an enlarged vertical sectional view for explaining the operation of the conventional stamp portion main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stamp body 2 Holder part 3 Stamp part 4 Stamp part main body 5 Peripheral holding member 26 Frame member 27 Ink holding body 28 Heat sensitive film 33 Stamp face part 50 Heating punching device 52 Keyboard 71 Drilling mounting part 72 Heating punching mechanism 110 Control unit 111 CPU 112 ROM 113 RAM 114 CG-ROM for punching

Claims (11)

[Claims] 1. An ink holder made of a porous elastic material for impregnating and holding ink and a heat-sensitive film made of a flexible thin film material perforated in a dot pattern are superposed and impregnated on the ink holder. In a heat-sensitive stencil printing apparatus that transfers ink to a material to be printed through the holes of the heat-sensitive film, the ratio of the amount of ink impregnated in the ink holder to the pores in the ink holder before impregnation with ink. Is set to about 1.5 or less, a heat-sensitive stencil printing apparatus. 2. The heat-sensitive stencil printing apparatus according to claim 1, further comprising: a void portion in the ink holder.
The ratio of the amount of ink impregnated in the ink holder is approximately 0.
A heat-sensitive stencil printing machine characterized by being set to 5 or more. 3. The heat-sensitive stencil printing apparatus according to claim 1, wherein the ratio of the amount of ink impregnated in the ink holding body to the pores in the ink holding body is MI / (V × γs−). Ms) The heat-sensitive stencil printing device characterized by the following. Here, MI = weight of ink impregnated in the ink holder V = volume of ink holder before ink impregnation γs = specific gravity of material of ink holder Ms = weight of ink holder 4. The heat-sensitive stencil printing apparatus according to claim 1, wherein the ink holder is made of polyurethane foam. 5. The heat-sensitive stencil printing apparatus according to claim 1, wherein the heat-sensitive film is made of a thermoplastic film having a thickness of 1 to 4 μm. 6. The heat-sensitive stencil printing apparatus according to claim 1, further comprising an ink impermeable rigid frame member that sandwiches the ink holder in cooperation with the heat-sensitive film, A heat-sensitive stencil printing apparatus, characterized in that the periphery of the frame member is fixed to the periphery of the heat-sensitive film to substantially seal the ink holder. 7. The heat-sensitive stencil printing apparatus according to claim 1, further comprising a stamp body that supports the heat-sensitive film and the ink holder, and heat the heat-sensitive film in a desired dot pattern. A heat-sensitive stencil printing apparatus comprising: a perforating head for perforating; and a pressing means for pressing the perforating head against the heat-sensitive film against the elasticity of the ink holding body from the side opposite to the ink holding body. . 8. The heat-sensitive stencil printing apparatus according to claim 7, further comprising moving means for moving the head relative to the stamp body along the heat-sensitive film while being pressed by the pressing means. Heat-sensitive stencil printer. 9. The heat-sensitive stencil printing apparatus according to claim 7, wherein the stamp body is attachable to and detachable from the head. 10. The heat-sensitive stencil printing apparatus according to claim 9, wherein the stamp body is a holder that can be gripped by hand.
An ink impermeable rigid frame member that supports the heat sensitive film and the ink holder, and the frame member is attachable to and detachable from the holder together with the heat sensitive film and the ink holder. A heat-sensitive stencil printer. 11. The heat-sensitive stencil printing apparatus according to claim 1, further comprising a stamp body that supports the heat-sensitive film and the ink holding body, and a dot pattern on the heat-sensitive film of the stamp body. A heating punching device for punching, wherein the heating punching device is a punching mounting part for removably mounting the stamp body, input means for inputting characters and symbols, and input data input from the input means. Data storing means for storing, a punching means including a thermal head for punching in a dot pattern on the heat-sensitive film of the stamp body mounted on the punching mounting part, receiving input data from the data storing means, and Control means for driving and controlling the perforating means, and the perforating means from the side opposite to the ink holding body against the elasticity of the ink holding body. A pressing means for pressing the thermal film, heat-sensitive stencil printing apparatus characterized by comprising a moving means for moving said stamp body relative along said thermal film the head while pressing with the pressing means.