JP2001232761A - Stencil printing machine with ink drying system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink drying system for a stencil printing machine by which ink can be enough dried by lengthening heating time. SOLUTION: The ink drying system 50 by which when printed papers are pinched and carried by a paper carrying means 16, the papers are heated to dry the printing ink on the papers is provided. The paper carrying means comprises a continuous contacting member 52 whose face being brought into contact with the printed paper is continuously extended along the paper carrying path and a pressing member 16 by which the printed paper is energized on the contact face of the continuous contacting member being brought into contact with the paper. The heating means heats at least the continuous contacting member 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ink drying system for a stencil printing machine.

[0002]

2. Description of the Related Art Conventionally, there has been proposed an ink drying apparatus for drying printed ink by passing printed paper between a heat roller and a pressure roller (for example, JP-A-3-92377).
No.).

[0003]

However, in the above-described configuration, since the time required for the paper to pass between the heat roller and the pressure roller is short, depending on conditions such as the type of paper and the degree of ink riding, Insufficient drying of the ink may occur.

[0004] Therefore, a technical problem to be solved by the present invention is to provide an ink drying system for a stencil printing machine that can prolong the heating time and sufficiently dry the ink.

[0005]

SUMMARY OF THE INVENTION The present invention provides a stencil printing machine having an ink drying system having the following configuration in order to solve the above technical problems.

The ink drying system of the stencil printing machine includes a printing unit for performing stencil printing, a sheet conveying unit for nipping and conveying the printed paper printed by the printing unit, and a heating unit for heating the sheet conveying unit. Wherein when the printed paper is nipped and transported by the paper transport means, the paper is heated to dry the printing ink on the paper. The paper transport means includes a continuous contact member having a contact surface with the printed paper extending continuously along the paper transport path, and applying the printed paper to a contact surface of the continuous contact member with the printed paper. And a biasing pressure member. The heating means,
At least the continuous contact member is heated.

In the above configuration, the printed paper is continuously contacted with the continuous contact member heated by the heating means and is heated, so that the ink on the paper can be sufficiently dried over time. That is, since the continuous contact member that contacts the paper continuously in the transport direction is heated, the heating time for the paper is lengthened, and the ink can be efficiently dried. Also, since the printed paper is sandwiched between the pressing member and the continuous contact member and pressed against the heating member,
It is possible to prevent wrinkles and waviness of the paper due to ink drying.

In the stencil printing machine having the ink drying system having the above-described structure, the heating temperature and the heating time can be appropriately set according to the ink characteristics. It is suitable for stencil printing.

The present invention is also applicable to a case where stencil printing is performed using an ink containing a thermosetting resin, in which case, a stencil printing machine having an ink drying system having the following configuration is provided. .

A stencil printing machine having an ink drying system includes a printing means for performing stencil printing using an ink containing a thermosetting resin, and a paper conveying means for nipping and conveying the printed paper printed by the printing means. And a heating means for heating the paper transporting means, wherein when the printed paper is nipped and transported by the paper transporting means, the paper is heated to dry the printing ink on the paper. is there. The paper transport means includes a continuous contact member having a contact surface with the printed paper extending continuously along the paper transport path, and applying the printed paper to a contact surface of the continuous contact member with the printed paper. And a biasing pressure member. The heating means heats at least the continuous contact member.

In each of the above structures, the continuous contact member and the pressing member can be configured in various modes.

Preferably, the continuous contact member is an endless circulating belt whose contact surface with the printed paper moves in the paper transport direction.

Preferably, the pressure member is an endless circulating belt partly arranged along the contact surface of the continuous contact member with the printed paper.

[0014] Preferably, the continuous contact member is a roller whose contact surface with the printed paper rotates in the paper transport direction.

Preferably, the pressure member is one or a plurality of rollers arranged along a contact surface of the continuous contact member with the printed paper.

[0016] Preferably, the continuous contact member includes:
Touches the printed surface of the printed paper. The apparatus further includes oil applying means for applying oil to a portion of the continuous contact member that contacts the printing surface.

According to the above configuration, by applying oil to the continuous contact member, it is possible to promote the separation between the printing surface of the printed paper and the continuous contact member. Therefore, the efficiency of the entire printing press can be improved.

Preferably, the pressing member includes a continuous extending portion extending continuously along the sheet transport path, and the continuous extending portion penetrates the sheet transport path side and the opposite side. It has a through hole.

In the above configuration, if the pressing member is, for example, a belt or a guide plate, a continuous extending portion can be provided. Since the volatile components of the ink on the printed paper can pass through the through-hole from the heating member and the pressing member to the continuous extending portion, it is possible to promote the drying of the ink.

Preferably, there is provided a second printing means for further performing stencil printing on the printed paper on which the ink has been dried.

By providing the ink drying system, the ink on the printed paper can be dried.
Further printing can be performed on the sheet by the second printing unit. For example, two-sided printing and color printing can be performed.
The second printing unit is not limited to the case where the second printing unit is provided separately from the first printing unit, and may be configured to also serve as the first and second printing units.

As specific ink drying conditions, preferably, the heating means continuously contacts the printed paper for 0.5 ms or more, and the surface temperature of the contact surface is 100 ° C. or more and 200 ° C. or less. It is.

If the length of contact of the heating means with the printed paper is short, the heating time is short, and the ink is not sufficiently dried. Therefore, the time of contact of the heating means with the printed paper is a predetermined time or more (0.5 ms or more). It is preferable that For example,
The paper transport speed of the paper transport unit needs to be about the same as or faster than the printing unit, and under the condition of a general paper transport speed (500 mm / s to 1200 mm / s), the heating unit uses the printed paper. Is 10 mm or more in the paper transport direction, and the contact time is 0.5 ms or more (0.83 ms to 20 ms).

If the heating temperature is low, the heating becomes weak and the ink drying takes a long time. Therefore, the surface temperature of the contact surface where the heating means contacts the printed paper is preferably 100 ° C. or more. On the other hand, if the surface temperature is too high, there are adverse effects such as the paper itself being dried too much, and the energy loss also increases, so the surface temperature of the contact surface is 200 °.
C or less is preferable.

Preferably, the pressure at which the pressure member urges the printed paper against the continuous contact member is 0.00.
It is 3 MPa or more and 0.03 MPa or less. Pressure is 0.0
If the pressure is less than 03 MPa, it becomes difficult to convey the paper, and if the pressure exceeds 0.03 MPa, the ink before drying is rubbed and the printed surface is easily stained.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a stencil printing machine provided with an ink drying system according to each embodiment of the present invention will be described with reference to the drawings.

The printing machine 10 according to the first embodiment is configured as shown in FIG.

That is, the printing press 10 includes a main body 18, a paper feed table 12, and a paper receiving table 14, and a printing mechanism 11 and an ink drying system 50 are arranged inside the main body 18.

The paper 2 on the paper feed table 12 is separated one by one by a separating plate 31 and a paper feed roller 32 and is conveyed to a paper receiving table 14. On the way, the plate cylinder 20 is
Pressed and printed.

In front of the plate cylinder 20, a paper detection sensor 32
And a pair of rollers 33 and 34 are arranged. The paper detection sensor 32 detects the passage of the paper. Roller pair 33, 3
Numeral 4 rotates in synchronization with the rotation of the plate cylinder 20, and sends out the sheet to the plate cylinder 20 at an appropriate timing so that printing can be performed at a predetermined position on the sheet. In addition, the roller pair 33, 3
Reference numeral 4 is adapted to come and go at an appropriate timing so as not to restrain the paper sandwiched between the plate cylinder 20 and the press roller 21.

The base paper made by the plate making section 22 is attached to the plate cylinder 20. The plate-making section 22 includes a roll-shaped base paper 4.
Is made into a plate and cut to a predetermined length. The collection unit 24 includes the plate cylinder 2
Remove the base paper stuck on 0 and collect it.

A separation plate 15 and a blower 13 are provided between the plate cylinder 20 and the paper receiving tray 14, and air is blown between the base paper adhered to the plate cylinder 20 and the paper to perform printing. The paper is promoted to separate from the plate cylinder 20.

The printed paper separated from the plate cylinder 20 is conveyed to the paper receiving tray 14 by the discharge belt 16. An ink drying system 50 is configured downstream of the discharge belt 16.

The ink drying system 50 is configured as shown in FIG. FIG. 2 is an example in which a portion related to the ink drying system 50 is unitized.
Is different from the actual printing press 10 in that the downstream side (paper receiving table 14 side) is taken out. The downstream side of the conveyor belt 16 of FIG. 1, that is, the upper side of the pressure belt 17 of FIG.
As shown in FIG.
And the pressure belt 17 are continuously in contact with each other in an arc shape.

A large number of small holes (for example, 4 mm in diameter) are formed on the entire circumference of the pressure belt 17 so that the moisture of the ink is released from these small holes to promote drying of the ink. The pressure belt 17 is not limited to such a porous belt, and may be, for example, a moisture-permeable belt. The pressure belt 17 needs to have heat resistance, and for example, a material made of silicon rubber, polyimide, or cloth can be used. The surface may be processed with Teflon. The pressure belt 17 is pressed at an appropriate pressure, for example, 0.01 MPa.
Touch 0.

As shown in FIG. 2, the heat roller 52 is a hollow cylinder, inside which a heater 53 is disposed. Further, the thermistor 54,
55 are in sliding contact with each other to detect the surface temperature of the heat roller 52.

The heat roller 52 is a PFA hard roller. As a result, the sheet can be stably conveyed by holding the sheet between the pressure belt 17 and the pressure belt 17 at a uniform pressure. The surface of the pressure belt 17 may be coated with a fluororesin.

An oil application section 56 is arranged along the outer peripheral surface of the heat roller 52. Oil application section 56
Is configured such that silicone oil is dropped from a tube 56a and applied to the outer peripheral surface of the plate cylinder 20 by an application member 56b. The application member 56b is pressed against the plate cylinder 20 by the pressing member 56c. The application member 56b is formed of a heat-resistant elastic material, for example, silicon rubber or urethane rubber. The oil application prevents the printing surface of the sheet from adhering to the plate cylinder 20, and facilitates the separation of the sheet from the plate cylinder 20.

The ink drying system 50 configured as described above is heated when the printed paper passes between the heat roller 50 and the transport belt 16, that is, the pressure belt 17, to dry the ink.

To give a specific example, if the length of the printed sheet in the transport direction in contact with the heat roller 50 is too short, it cannot be heated sufficiently and the ink is not dried.
mm or more is required. For example, it is about 40 mm. The peripheral speed of the heat roller 50 needs to be equal to or higher than the peripheral speed of the plate cylinder 20, for example, 500 mm / sec.
１1200 mm / sec. The surface temperature of the heat roller 50 is 100 ° C. to 200 ° C., preferably 160 ° C.
Is controlled so that the ink can be dried stably and continuously even if the surface temperature of the heat roller 20 decreases (fluctuates) as the paper passes. For example, even if the temperature drops to 100 ° C,
Ink can be dried. Depending on the type of ink and the thickness of the paper, it is considered that drying can be performed even at a lower temperature.

Next, a modification of the ink drying system shown in FIGS. 3 to 7 will be described. In the figure, the arrow F indicates the transport direction of the printed paper.

FIG. 3 shows a type in which printed paper is transported by a pair of belts 100 and 102. Upper belt 10
A heater 104 is disposed in the area 0 to heat the printed paper via the upper belt 100.

FIG. 4 is similar to the first embodiment described above.
This is a type in which a roller 110 is disposed on the upper side and a belt 112 is disposed on the lower side, and the roller 110 is heated by a heating unit (not shown).

FIG. 5 is a view opposite to FIG.
0, a type in which a roller 122 is arranged on the lower side. In this example, the upper belt 120 is heated by a heating unit (not shown).

FIG. 6 shows a type in which a plurality of pressure rollers 131 to 136 are arranged below the upper heat roller 130. In this example, the upper heat roller 130 is heated by a heating unit (not shown).

FIG. 7 shows that pressing rollers 142, 143, and 1 are provided below a heating roller 140 heated by a heating means (not shown).
44, and the pressure rollers 142, 143,
The guide plates 145 and 146 are arranged between 144.
The guide plates 145 and 146 have ribs (not shown) for removing static electricity while keeping the paper from coming off the heat roller 140 in contact with the paper.

FIG. 8 shows a duplex printer 10a according to the second embodiment.
FIG.

The double-sided printing press 10a is configured substantially in the same manner as the printing press 10 of the first embodiment, and includes a printing mechanism 11a and an ink drying system 50a. 18a, a paper collection unit 70 is provided to collect the paper printed on the first side once,
It can be printed on the surface.

The paper collecting section 70 will be described. A double-sided and single-sided switching guide 48 is arranged near the paper discharge section from the paper discharge belt 16a. This double-sided single-sided switching guide 48
The first position where the paper after ink drying is retracted from the first transport path in which the paper is transported to the external paper receiving tray 14 provided outside the main body 18a, the first position enters the first transport path, and the inside of the main body 18a And a second position at which the paper transport path is switched to a second transport path in which the paper is transported to the internal paper receiving tray 14s provided at the second position.

In the second transport path, transport roller pairs 71, 72, 73 for transporting the sheet while nipping it are arranged. The second transport path is bent by a reversing roller 74 and a guide plate 75 disposed along the outer periphery thereof. A shaft 77 is provided above the internal paper receiving tray 14s.
, A pressing roller 76 that rotates between a lower position indicated by a solid line and an upper position indicated by a dotted line is disposed. The press roller 76 retreats to the upper position when the paper is carried into the paper receiving tray 14s, and moves down to the lower position when the leading edge of the paper passes below the paper receiving tray 14s to hold the paper.
Get down early on s. The paper receiving table 14s is provided with a contact guide plate 15 to which the leading end of the conveyed paper is applied. The contact guide plate 15 can be set at an appropriate position according to the length of the sheet. Paper tray 1
On the 4s, the single-sided printed sheets are stacked with their print surfaces facing up, with their leading ends aligned by the contact guide plate 15.

At the end opposite to the contact guide plate 15 of the paper receiving table 14s, a paper feed roller 30s and a separating roller 30t are provided.
Is provided so that the single-sided printed paper on the paper receiving table 14s can be conveyed to the upper printing mechanism 11a and printed on the paper again.

In the case of single-sided printing, a double-sided and single-sided switching guide 18
Is set to the first position, and the printed paper is collected in the external paper receiving tray 14 immediately after the ink is dried.

In the case of double-sided printing, first, printing is performed on the first side of a sheet. At this time, the double-sided single-sided switching guide 18 is set at the second position, and the paper printed on the first surface is collected in the internal paper receiving unit 14s after the ink is dried. Next, the paper on the paper receiving portion 14s printed on the first surface is printed on the second surface. At this time, the double-sided and single-sided switching guide 18 is set at the first position, and the sheet printed on the second side is collected by the external sheet receiving tray 14 after the ink is dried.

The paper printed on the first side is stacked with the ink dried by the ink drying system, so that there is no show-through on the second side of the paper. Therefore,
High-quality printing without contamination on the second surface can be performed.

FIG. 9 shows a color printing machine 10 according to the third embodiment.
It is a block diagram of b.

The color printing machine 10b comprises three printing mechanisms 11Y, 11M and 11C, which are configured substantially in the same manner as the printing machine 10 of the first embodiment, and an ink drying system 50.
Y, 50M, and 50C are alternately arranged, and color printing can be performed using three color inks.

That is, the printing mechanism 11Y performs printing with yellow ink, and after printing, the ink is dried by the ink drying system 50Y. Next, the printing mechanism 11M
Prints with magenta ink. Similarly, after drying the ink with the ink drying system 50Y, the printing mechanism 1
Printing is performed with cyan ink at 1C, and the ink is dried with the ink drying system 50C.

When printing another color ink, the previously printed ink has already been dried, so that printing can be performed without contamination.

In the ink drying system described above, the ink can be sufficiently dried by continuously contacting the paper and increasing the heating time.

The present invention is not limited to the above embodiments but can be implemented in various other modes. For example, it is not limited to the configuration in which the printing surface side of the paper is heated,
The back side of the printing surface may be heated, or both sides may be heated.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a stencil printing machine having an ink drying system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of the ink drying system of FIG. 1;

FIG. 3 is a configuration diagram of a modified example of the ink drying system.

FIG. 4 is a configuration diagram of a first modification of the ink drying system.

FIG. 5 is a configuration diagram of a second modification of the ink drying system.

FIG. 6 is a configuration diagram of a third modification of the ink drying system.

FIG. 7 is a configuration diagram of a fourth modification of the ink drying system.

FIG. 8 is a configuration diagram of a stencil printing machine having an ink drying system according to a second embodiment of the present invention.

FIG. 9 is a configuration diagram of a stencil printing machine having an ink drying system according to a third embodiment of the present invention.

[Explanation of symbols]

2,3 paper 4; 4Y, 4M, 4C raw paper 10,10a, 10b stencil printing machine 11; 11A; 11Y, 11M, 11C printing mechanism 12 paper feeder 13; 13Y, 13M, 13C blower 14,14s paper receiver 15 Stop guide plate 16; 16A; 16Y, 16M, 16C Discharge belt (conveying means) 17 Pressure belt 18, 18a, 18b Main body 19, 19a, 19b Document pressing plate 20; 20a; 20Y, 20M, 20C Plate cylinder ( 21a, 21M, 21C Press roller (printing means) 22; 22a; 22Y, 22M, 22C Plate making section 24; 24a; 24Y, 24M, 24C Collection section 30, 30a, 30b Feeding ring 31, 31a, 31b Separating plate 32 Paper detection sensor 33 Upper roller 34 Lower roller 50; 50a; 50Y, 50M, 5 C Ink drying system 52 Heat roller (conveying means) 53 Heater (heating means) 54, 55 Thermistor 56 Oil applying section (oil applying means) 56a Tube 56b Application member 56c Pressing member 70 Paper collection section 71, 72, 73 Transport roller pair 74 Reversing roller 75 Guide plate 76 Pressing roller F Paper transport direction

Claims (11)

[Claims] A printing means for performing stencil printing (20, 21)
Paper transport means (16, 52) for nipping and transporting the printed paper printed by the printing means (20, 21); and heating means (5) for heating the paper transport means (16, 52).
An ink drying system (50) for heating the paper and drying the printing ink on the paper when the printed paper is nipped and transported by the paper transport means (16, 52). A stencil printing machine (10), wherein the paper transport means (16, 52) comprises a continuous contact member (52) whose contact surface with the printed paper extends continuously along the paper transport path. A pressurizing member (16) for urging the printed paper on a contact surface of the continuous contact member (52) with the printed paper, wherein the heating means (53) includes at least the continuous contact member (52). A stencil printing machine having an ink drying system, wherein the stencil printing machine is heated. 2. A printing means (20, 21) for performing stencil printing using an ink containing a thermosetting resin, and a sheet for nipping and conveying a printed sheet printed by the printing means (20, 21). A conveying unit (16, 52); and a heating unit (5) for heating the sheet conveying unit (16, 52).
An ink drying system (50) for heating the paper and drying the printing ink on the paper when the printed paper is nipped and transported by the paper transport means (16, 52). A stencil printing machine (10), wherein the paper transport means (16, 52) comprises a continuous contact member (52) whose contact surface with the printed paper extends continuously along the paper transport path. A pressurizing member (16) for urging the printed paper on a contact surface of the continuous contact member (52) with the printed paper, wherein the heating means (53) includes at least the continuous contact member (52). A stencil printing machine having an ink drying system, wherein the stencil printing machine is heated. 3. The endless circulating belt (10) in which a contact surface with a printed sheet moves in a sheet conveying direction.
0, 120).
A stencil printing machine as described. 4. An endless circulating belt (16; 10) in which a part of the pressure member is disposed along a contact surface of the continuous contact member (52; 100, 110) with a printed sheet.
2, 112).
A stencil printing machine as described. 5. The roller (52; 11), wherein the contact surface of the continuous contact member with the printed paper rotates in the paper transport direction.
0, 130, 140). 6. The pressure member is connected to the continuous contact member (1).
20, 130, 140) rollers (122, 131 to 136, 14) arranged along the contact surface with the printed paper.
2 to 144).
A stencil printing machine as described. 7. An oil applying means (56) for contacting the continuous contact member (52) with a printing surface of a printed paper and applying oil to a portion of the continuous contact member (52) contacting the printing surface. The stencil printing machine according to claim 1 or 2, further comprising: 8. The pressurizing member (16) includes a continuous extending portion extending continuously along the paper transporting path, and the continuous extending portion has a side opposite to the paper transporting path side. 3. The stencil printing machine according to claim 1, wherein the stencil printing machine has a through hole penetrating through the stencil. 9. Second printing means (20a, 21a; 2) for further performing stencil printing on printed paper on which ink has been dried.
0M, 21M, 20C, 21C). 10. The heating means (53) has a length of 0.5 ms.
The stencil printing machine according to claim 1, wherein the stencil printing plate continuously contacts the printed paper, and the surface temperature of the contact surface is 100 ° C. or more and 200 ° C. or less. 11. The pressure at which the pressure member (16) urges the printed paper against the continuous contact member (52) is 0.0.
The stencil printing machine having the ink drying system according to claim 1, wherein the stencil pressure is not less than 03 MPa and not more than 0.03 MPa.