JP3577147B2 - Stencil printing machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a stencil printing apparatus that forms a perforated image on a master with a heating element such as a thermal head.
[0002]
[Prior art]
As a simple printing apparatus, a thermosensitive digital stencil printing apparatus is well known. In this stencil printing apparatus, a thermal head in which fine heating elements are arranged in a line is brought into contact with a master for heat-sensitive stencil, and the master is conveyed by a platen roller while energizing the heating elements in a pulsed manner. After forming a perforated image based on the image information on the master by hot-melt perforation, the perforated master is cut at a predetermined length and wound around a plate cylinder, and the ink of the emulsion type is formed inside the plate cylinder by an ink roller. By pressing the paper against the outer peripheral surface of the plate cylinder by a press roller while supplying the ink to the peripheral surface, ink oozes out from the opening portion of the plate cylinder and the perforated portion of the master, and the ink is transferred to the paper to perform printing.
[0003]
[Problems to be solved by the invention]
In the conventional apparatus, the ink transferred to paper is an emulsion ink in which an aqueous phase and an oil phase are mixed, and this ink has an aqueous phase of 70%. This water phase inhibits the penetration of the oil phase (oil + pigment + surfactant) in the ink into the paper, causing the ink to rise to the surface of the paper, which takes time to dry the ink. The above-described technique has a problem that so-called show-through (re-transfer after printing) occurs in which ink is transferred to the back surface of the next discharged sheet.
[0004]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a stencil printing apparatus capable of quickly absorbing ink into paper and preventing show-through.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, a master is wound around an outer peripheral surface of a porous plate cylinder, ink is supplied from an inner peripheral surface of the plate cylinder, and ink oozed from the master is pressed against a transfer cylinder. transferring one o'clock Te, the ink has been transferred onto the transfer cylinder Te stencil printing apparatus odor for printing by pressing the paper at the impression cylinder, a heating means for heating the upper Symbol transfer cylinder, a temperature sensor for detecting the environmental temperature has, upper Symbol heating means is controlled to heat amount according to the environmental temperature information from the temperature sensor, the upper Symbol transfer cylinder is smaller in diameter than the plate cylinder, and the surface of the transfer cylinder is endless The pressing force of the transfer cylinder against the plate cylinder is set to be smaller than the pressing force of the impression cylinder against the transfer cylinder.
[0006]
According to a second aspect of the present invention, in the stencil printing machine according to the first aspect, the heating means heats the entire transfer cylinder.
[0007]
According to a third aspect of the present invention, in the stencil printing machine according to the first or second aspect , the heating means is provided inside the transfer cylinder .
[0008]
According to a fourth aspect of the present invention, in the stencil printing apparatus according to the first, second or third aspect, the ink is an emulsion ink .
[0011]
Here, the impression cylinder includes a so-called press roller having a smaller diameter than the plate cylinder.
[0012]
【Example】
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
The stencil printing machine shown in FIG. 1 includes a plate cylinder denoted by reference numeral 1, a plate making / writing device 3 disposed above and to the right of the plate cylinder 1, and a transfer cylinder 91 disposed near and below the plate cylinder 1. A heating unit 98 disposed to the right of the transfer cylinder 91; an impression cylinder 94 disposed near and below the transfer cylinder 91; a sheet feeding device 47 disposed to the right of the impression cylinder 94; The printing apparatus includes a plate discharging device 62 disposed on the upper left side of the cylinder 1, a paper discharging device 56 disposed on the left side of the impression cylinder 94, and a document reading unit 88 disposed above the plate cylinder 1. ing.
[0013]
The plate cylinder 1 has a porous cylindrical support layer forming an inner peripheral surface, and a screen layer wound around the outer peripheral surface thereof. The plate cylinder 1 is rotatably supported, and is rotated by a motor (not shown). Is done. A clamper 2 for clamping the leading end of the master 8 is provided on the outer peripheral surface of the plate cylinder 1. The clamper 2 is pivotally attached to the outer peripheral surface of the plate cylinder 1 by a shaft 2a, and is rotatable by transmitting a driving force by opening / closing means (not shown). A well-known ink supply unit (not shown) for supplying ink to the inner peripheral surface of the plate cylinder 1 is arranged inside the plate cylinder 1.
[0014]
The plate making and writing apparatus 3 includes a master holding unit 9 that supports the rolled master 8 so as to be able to be fed out, feeding rollers 11 and 12 that feed out the master 8, and a master peeling that peels the master 8 from the rolled master 8. Plate making means mainly comprising a claw 20 and a thermal head 22 and a platen roller 23 for performing perforation on the master 8 by fusion, and a movable blade 24 disposed downstream of the platen roller 23 for cutting the master 8 and fixed. It is mainly composed of a cutting means provided with a blade 25 and delivery rollers 26 and 27 arranged downstream of the cutting means in the conveying direction of the master 8.
[0015]
The master holding unit 9 includes a holding unit 19 for positioning the roll-shaped master 8 and applying a back tension to the roll-shaped master 8. Feeding rollers 11 and 12 for feeding out the master 8 are arranged in the holding unit 19. The feeding rollers 11, 12 are formed in a dumpling shape in order to stabilize the feeding of the master.
[0016]
The master peeling claw 20 is fixed to the support member 21 and is formed of an elastic body. The shape of the master peeling claw is convex at the center so that the master peeling can be peeled off from the leading end of the master roll. The one curved to the side is good.
[0017]
The thermal head 22 is attached to a side plate of the plate making / writing device 3 and can be freely moved toward and away from the platen roller 23 via the master 8 by a contacting / separating mechanism (not shown). The thermal head 22 has a well-known function of selectively heating and melting the master 8 based on an image signal from the document reading unit 88 and perforating the same. The platen roller 23 is rotatably supported by a side plate of the plate making and writing device 3, is rotationally driven by a driving unit (not shown), and conveys the master 8 to the downstream side while pressing the master 8 against the thermal head 22.
[0018]
The movable blade 24 is rotated with respect to the fixed blade 25 by a moving mechanism (not shown) to cut the master 8.
The feed rollers 26 and 27 convey the master 8 perforated and made by the plate making means to the clamping means of the plate cylinder 1. The feed rollers 26 and 27 are rotatably supported by a side plate of the plate making and writing device 3, and the feed roller 26 is driven to rotate by a driving unit (not shown), and the feed roller 27 rotates with the feed roller 26. A guide plate 28 for guiding the master 8 to the clamper 2 is disposed on a side plate of the plate making / writing device 3 further downstream of the feed rollers 26 and 27.
[0019]
The paper feed device 47 includes a paper feed tray 48, a call roller 50, paper feed rollers 49a and 49b, feed rollers 51a and 51b, transport guide plates 52 and 53, a separation plate 80, a paper sensor 81, and a paper feed motor (not shown). It is mainly composed of
The paper feed tray 48 has paper P stacked thereon, and is supported by the paper feed device main body 47a so as to be vertically movable. The paper feed tray 48 is moved up and down in conjunction with the increase and decrease of the paper P. The separation plate 80 is arranged in contact with the paper feed roller 49a by a spring (not shown), and when the plurality of papers P is called, only the upper paper P can be conveyed, and the lower paper P can be conveyed. Inhibit.
[0020]
The call roller 50 and the paper feed roller 49a are provided so as to contact the uppermost sheet P, and the paper feed roller 49a is driven to rotate by a drive motor. The paper feed roller 49b is not rotated in the clockwise direction by an overrunning clutch (not shown), so that the retrieved paper P is separated (a brake is applied to the lower paper P when two papers are retrieved). Then, only one sheet is fed to the feed rollers 51a and 51b via the transport guide plate 53.
[0021]
The call roller 50 and the paper feed roller 49a are connected by a belt (not shown), and are rotated at the same speed in the same direction. Feed rollers 51a and 51b are disposed downstream of the sheet feed rollers 49a and 49b in the sheet transport direction. The feed roller 51a is driven to rotate by transmitting the drive of a paper feed motor by a belt (not shown). On the other hand, the feed roller 51b comes into contact with the feed roller 51a only when necessary for sheet conveyance in synchronization with the rotation of the plate cylinder 1 by the operation of a cam (not shown). The leading end of the sheet P conveyed by the feed rollers 51a and 51b is conveyed between the outer peripheral surface of the plate cylinder 1 and the impression cylinder 94 at a certain timing. The guide plates 52 and 53 are fixed to side plates of the main body of the stencil printing apparatus, and guide paper P to be fed.
[0022]
A transfer cylinder 91 having substantially the same diameter as that of the plate cylinder 1 for pressing and temporarily transferring ink oozed from the perforated portion of the master 8 is disposed near the lower portion of the plate cylinder 1. A concave portion 91 a is formed in the transfer cylinder 91 so as not to hit the clamper 2. At least a portion of the transfer cylinder 91 to which ink is transferred from the master 8 is wound with a sheet (not shown) made of rubber, resin, or the like. As this sheet, nitrile rubber used for a blanket of an offset printing machine in this example is used. The transfer cylinder 91 rotates at a predetermined timing synchronized with the plate cylinder 1 and at a predetermined pressing force.
[0023]
When all of the ink temporarily transferred to the transfer cylinder 91 is transferred to the paper P, no ink adheres to the transfer cylinder 91. However, depending on the surface properties of the transfer cylinder 91 and the surface condition of the paper P, the ink is transferred. It will remain on the torso 91. Therefore, in this embodiment, a cleaning unit 92 for removing and cleaning the ink on the transfer cylinder 91 is provided. The cleaning unit 92 has a cleaning roller 93 that is arranged in contact with the transfer cylinder 91 and sucks ink on the transfer cylinder 91. The cleaning roller 93 is made of, for example, ink-absorbing porous rubber. The ink may be absorbed by sequentially sending an ink-absorbing cloth (felt) to the surface of the cleaning roller 93.
[0024]
The heating unit 98 is disposed to face the transfer cylinder 91, and includes a heat source 98 a and a reflection plate 98 b that collects heat from the heat source 98 a on a part of the surface of the transfer cylinder 91. The aqueous phase is evaporated from the temporarily transferred ink. As the heat source 98a, for example, a heating tube (halogen lamp) is used. As shown in FIG. 2, a heating control plate 97 for controlling the heating amount is connected to the heat source 98a. The main part of the heating control plate 97 is constituted by a microcomputer including a ROM, a RAM, a CPU and the like, and is connected to a temperature sensor 89 for detecting an environmental temperature via a control plate I / O port 96.
[0025]
The heating control plate 97 changes the heating amount of the heating means 98 based on the environmental temperature information from the temperature sensor 89. That is, even when the environmental temperature is low, the heating amount is corrected so as to remove a predetermined amount of water from the ink. Further, a temperature adjustment switch (not shown) is provided in the operation unit so that the user can adjust the amount of heating by the heating unit 98 while checking the state of the printed matter. The amount of heating by the heating means 98 is controlled by PWM (pulse width) or the like, that is, by controlling the energization time. As described above, in this embodiment, since a part of the surface of the transfer cylinder 91 is heated, the ink can be heated with a small heating energy.
[0026]
As shown in FIG. 3, the ink 100 used in the stencil printing apparatus is an emulsion type in which an aqueous phase 101 and an oil phase 102 are mixed, and the ratio is set to, for example, 7: 3. The oil phase 102 includes an oil, a pigment, a surfactant, and the like.
[0027]
An impression cylinder 94 that presses the ink temporarily transferred to the outer peripheral surface of the transfer cylinder 91 onto the sheet P conveyed from the paper feeding device 47 and prints the ink is provided near the lower portion of the transfer cylinder 91. The impression cylinder 94 is fixed to a support shaft (not shown) swingably supported on a side plate of the main body of the stencil printing apparatus, and is brought into contact with the transfer cylinder 91 via the paper P by being rocked by a rocking means (not shown). Leave. The impression cylinder 94 rotates in synchronization with the plate cylinder 1 while pressing the ink on the transfer cylinder 91 with a predetermined pressing force. The pressing force of the transfer cylinder 91 on the plate cylinder 1 is set smaller than the pressing force of the impression cylinder 94 on the transfer cylinder 91. This allows ink of a size faithful to the perforation of the master 8 to be temporarily transferred to the transfer cylinder 91, and is useful for penetrating the ink into the paper P.
[0028]
The impression cylinder 94 is provided with a claw claw (not shown) for holding the leading end of the paper P. This gripper has the same mechanism as that used in offset printing presses and the like, and expands when the impression cylinder 94 rotates to a grip angle, grips the leading end of the paper P, and furthermore, the impression cylinder 94 When rotated by an angle, the leading end of the paper P is released.
[0029]
The paper discharging device 56 mainly includes a guide plate 95, a driven roller 57, a driving roller 58, a belt 59, a fan 60, a paper discharging tray 61, and the like.
The driven roller 57 and the driving roller 58 are rotatably supported by a side plate of the sheet discharging device main body 56a, and a belt 59 having a plurality of apertures on its surface is stretched between the rollers. The driving roller 58 is driven to rotate by driving means (not shown), and the rotational force is transmitted to the driven roller 57 via a belt 59. A fan 60 is provided below the rollers 57 and 58. The fan 60 generates a downward airflow in the figure by its rotation, and sucks the sheet P on the surface of the belt 59. On the downstream side of the drive roller 58 in the sheet conveyance direction, a sheet discharge tray 61 for stacking the sheets P is provided integrally with the sheet discharge device main body 56a.
[0030]
The plate discharging device 62 mainly includes an upper plate discharging member 63, a lower plate discharging member 64, a plate discharging box 65, a compression plate 66, and the like.
The upper plate discharging member 63 is composed of a driving roller 67 and a driven roller 68 that are rotated and driven by a driving unit (not shown), and a rubber belt 69 stretched between the rollers. The lower plate discharging member 64 is composed of a driving roller 70 and a driven roller 71 which are connected to a driving roller 67 by a gear (not shown), and a rubber belt 72 stretched between the rollers. The lower plate discharging member 64 is movable in the left-right direction about the center axis of the drive roller 67, and is moved by moving means (not shown). By the movement of the lower plate discharging member 64, the outer peripheral surface of the drive roller 70 can freely contact and separate from the outer peripheral surface of the plate cylinder 1. The plate discharging box 65 is provided detachably with respect to the plate discharging device 62 main body. Above the plate discharge box 65, a compression plate 66 that is moved up and down by a lifting means (not shown) is provided.
[0031]
Next, the operation of the stencil printing apparatus will be described.
When the operator presses the plate making start button, first, the plate discharging device 62 discharges the master 8 of the previous plate. The plate cylinder 1 around which the master 8 of the previous plate is wound on the outer peripheral surface is started to rotate counterclockwise by the motor of the plate cylinder 1. When the rear end of the master 8 of the previous plate wound around the outer peripheral surface of the plate cylinder 1 reaches a predetermined plate discharging position facing the drive roller 70, the drive means and the movement means (not shown) operate, and the drive roller The lower plate discharging member 64 is moved toward the plate cylinder 1 while rotating 70.
[0032]
When the outer peripheral surface of the drive roller 70 comes into contact with the outer peripheral surface of the plate cylinder 1, the plate cylinder 1 continues to rotate counterclockwise, and the drive roller 70 scoops up the rear end of the master 8. The picked-up master 8 is sandwiched between the lower plate discharging member 64 and the upper plate discharging member 63 and is separated from the outer peripheral surface of the plate cylinder 1. The peeled master 8 is conveyed by the lower plate discharging member 64 and the upper plate discharging member 63, and is discarded in the plate discharging box 65, and then compressed by the compression plate 66.
[0033]
When the master 8 of the previous plate is completely peeled off from the outer peripheral surface of the plate cylinder 1, the plate cylinder 1 further rotates, and the clamper 2 stops at the plate feeding position located near the guide plate 28. When the plate cylinder 1 is stopped at the plate feeding position, an opening / closing means (not shown) is operated to rotate the clamper 2 clockwise to enter a plate feeding standby state, and the plate discharging operation is completed.
[0034]
Immediately after the start of the plate discharging operation, the plate making operation is performed as follows.
The document reading unit 88 irradiates the surface of the document with light to read the image of the document. The photoelectrically converted electric signal is input to an image processing circuit (not shown). In parallel with the reading of the document image, a plurality of heating elements provided on the thermal head 22 selectively generate heat in accordance with a digital image signal sent after being processed in the image processing circuit, and a platen roller 23. The feed rollers 26 and 27 are respectively driven to rotate by driving means (not shown). The master 8 is fed by the rotation of the feed rollers 11 and 12, peeled off from the master roll by the master peeling claw 20, melted and perforated by the thermal head 22 while being conveyed by the platen roller 23, and fed by the feed rollers 26 and 27. 1 is conveyed toward the outer peripheral surface.
[0035]
The master 8 melt-punched by the plate making / writing device 3 is conveyed by the rotation of the platen roller 23 and the feed rollers 26 and 27, and the leading end of the master 8 is sent to the clamper 2 which is expanding in a plate feeding standby state. You. When the master 8 having been made has been conveyed for a predetermined length and its leading end reaches the clamper 2, the clamper 2 is closed by opening / closing means (not shown). At the same time as the clamping operation, the plate cylinder 1 is rotated clockwise, and the master 8 is wound around the outer peripheral surface of the plate cylinder 1.
[0036]
When the master 8 is wound on the outer peripheral surface of the plate cylinder 1 for a predetermined length, the rotation of the plate cylinder 1, the feed rollers 26 and 27, and the platen roller 23 is stopped. Simultaneously with the stop operation, the movable blade 24 is moved by a moving mechanism (not shown), and the master 8 is cut off with the fixed blade 25. Then, the plate cylinder 1 is rotated in the clockwise direction again, the rear end of the cut master 8 is pulled out of the plate making / writing device 3, and the master 8 having been formed is completely wound on the outer peripheral surface of the plate cylinder 1. Then, the plate supply process ends.
[0037]
After the plate feeding step, the transfer cylinder 91 is brought into contact with the plate cylinder 1 via the master 8 with a predetermined pressing force. In this state, the plate cylinder 1 and the transfer cylinder 91 are respectively driven to rotate in predetermined directions. The master 8 on the plate cylinder 1 is pressed by the transfer cylinder 91, and the ink supplied to the inner peripheral surface of the plate cylinder 1 oozes out from the perforated portion of the master 8 and is temporarily transferred to the transfer cylinder 91.
[0038]
Here, environmental temperature information from the temperature sensor 89 is input to the heating control plate 97 (see FIG. 2) via the control plate I / O port 96. The heating control plate 97 energizes and heats the heat source 98a for a time corresponding to the environmental temperature information, heats the surface of the transfer cylinder 91, and removes a predetermined amount of water from the ink of the ink image temporarily transferred to the surface of the transfer cylinder 91. Is evaporated off.
[0039]
On the other hand, the paper P on the paper feed tray 48 is fed by the call roller 50, and is separated and fed one by one between the paper feed rollers 49a and 49b. Thereafter, the paper P is guided and fed by the guide plate 53, and after being timed by the feed rollers 51a and 51b, guided by the guide plate 52 and fed toward the squeeze claw of the impression cylinder 94. .
[0040]
The impression cylinder 94 is swung by a swinging means (not shown) to a position in contact with the transfer cylinder 91 via the sheet P, and rotates in synchronization with the plate cylinder 1 while pressing the sheet P with a predetermined pressing force. As a result, the ink (preferably, only the pigment and oil portions), which are temporarily transferred onto the transfer cylinder 91 and have a predetermined amount of water evaporated, are pressed against the paper P. The pigment and the oil in the ink penetrate into the paper P and are printed without being disturbed by moisture.
[0041]
The printed paper P is released from the rivet claw at a predetermined position, and is discharged onto the belt 59 along the guide plate 95. The printed paper P on the belt 59 is conveyed by the rotation of the drive roller 58 while being sucked onto the belt 59 by the fan 60, and is discharged onto the paper discharge tray 61. The master 8 having undergone plate making is brought into close contact with the outer peripheral surface of the plate cylinder 1 by pressing the transfer cylinder 91, and the plate applying process is completed.
[0042]
Thereafter, by pressing a print start switch after setting printing conditions such as the number of prints, the plate cylinder 1 is rotated by a motor, and the paper P is continuously fed to perform printing. After printing on the paper P, the ink remaining on the transfer cylinder 91 is sucked and removed by the cleaning roller 93.
[0043]
FIG. 4 shows a second embodiment. This embodiment is different from the first embodiment in that the size of the transfer cylinder 38 is made smaller than that of the plate cylinder 1 and that the heating means 198 is arranged inside the transfer cylinder 38 so that the entire transfer cylinder 38 is formed. It differs from the point of heating. Note that the operation of this embodiment is the same as that of the first embodiment, and a description thereof will be omitted.
[0044]
Since the transfer cylinder 38 and the plate cylinder 1 are not the same diameter, when the ink oozed from the master 8 on the plate cylinder 1 is temporarily transferred to the transfer cylinder 38, the transfer cylinder 38 having a smaller diameter than the plate cylinder 1 In some cases, the transfer cylinder 38 rotates more than one revolution, and if there is a cut or a seam, the image is affected. Therefore, a seamless process without a cut or a seam is used for the surface of the transfer cylinder 38. Further, if there is a clamper 2 (see FIG. 1) configured to protrude from the plate cylinder 1, it will hit the transfer cylinder 38. Therefore, a clamper that does not protrude from the surface of the plate cylinder 1 is adopted. For example, as disclosed in JP-A-6-127107 and JP-A-6-127108, there is a method in which a master is sandwiched between seams on the surface of a plate cylinder. When the transfer cylinder 38 is made smaller in diameter than the plate cylinder 1 in this manner, the apparatus becomes light and compact.
[0045]
As the heating means 198, for example, a heating wire, a heating tube (halogen lamp), a far-infrared heating element, or the like is used. By disposing the heating means 198 inside the transfer cylinder 38, the surface of the transfer cylinder 38 can be heated uniformly, and the ink transferred onto the transfer cylinder 38 can be heated uniformly.
In each of the embodiments, the emulsion type ink is described as the ink 100. However, an aqueous ink or an oil ink may be used.
[0046]
【The invention's effect】
According to the first aspect of the present invention, the heating means evaporates a predetermined amount of water from the ink temporarily transferred onto the transfer cylinder, and then prints on the paper. The image can be prevented.
According to the first aspect of the present invention, since the pressing force of the transfer cylinder on the plate cylinder is smaller than the pressing force of the impression cylinder on the transfer cylinder, ink of a size faithful to the punching of the master is temporarily applied to the transfer cylinder. The transferred and temporarily transferred ink penetrates into the paper, so that a printed image with less bleeding can be obtained.
Further, in the invention according to claim 1, the diameter of the transfer cylinder is smaller than that of the plate cylinder, so that the transfer cylinder is lightweight and compact. Since the surface of the transfer cylinder is made endless and seamless, there is no break or seam in the ink temporarily transferred to the transfer cylinder, and a beautiful image can be obtained.
[0047]
According to the second aspect of the invention, in addition to the effect of the first aspect, since the heating means heats the entire transfer cylinder, the surface of the transfer cylinder can be uniformly heated, and the ink temporarily transferred to the transfer cylinder can be uniformly dispersed. Can be heated.
[0048]
According to the third aspect of the present invention, in addition to the effect of the first aspect, since the heating means is disposed inside the transfer cylinder, the surface of the transfer cylinder can be uniformly heated, and the ink transferred onto the transfer cylinder can be uniformly dispersed. Can be heated.
[0049]
According to the fourth aspect of the present invention, in addition to the effect of the first aspect, the heating means controls the heating amount according to the environmental temperature, so that the ink is heated at the optimal heating amount according to each environmental temperature. .
[0050]
According to the fifth aspect of the present invention, the heating means evaporates a predetermined amount of water from the emulsion ink temporarily transferred onto the transfer cylinder, and thereafter prints on the paper, so that the ink easily permeates into the paper. Prevents show-through .
[Brief description of the drawings]
FIG. 1 is a schematic side view of a stencil printing apparatus employing a first embodiment of the present invention.
2 is a control block diagram of a heating unit of the stencil printing apparatus shown in FIG. 1; FIG. 3 is a schematic structural diagram of ink used in the stencil printing apparatus;
FIG. 4 is a schematic side view of a stencil printing apparatus employing a second embodiment of the present invention.
[Explanation of symbols]
1 Plate Cylinder 3 Plate Making / Writing Device 8 Master P Paper 11, 12 Feeding Roller 20 Master Peeling Claw 22 Thermal Head 23 Platen Roller 26, 27 Feeding Roller 38, 91 Transfer Cylinder 47 Paper Feeder 56 Paper Ejector 62 Plate Ejector 88 Part 89 temperature sensor 94 impression cylinder 97 heating control plates 98, 198 heating means

Claims (4)

A master is wound around the outer peripheral surface of the porous plate cylinder, ink is supplied from the inner peripheral surface of the plate cylinder, and ink oozed from the master is pressed to the transfer cylinder to temporarily transfer the ink, and the transfer cylinder is temporarily transferred. the ink transferred to the upper Te stencil printing apparatus odor for printing by pressing the paper in the impression cylinder,
Heating means for heating the upper Symbol transfer cylinder,
A temperature sensor for detecting an environmental temperature,
The upper SL heating means is controlled to heat amount according to the environmental temperature information from the temperature sensor,
Upper Symbol transfer cylinder is smaller in diameter than the plate cylinder, and the surface of the transfer cylinder is a seamless endless,
Stencil printing machine, characterized in that the pressing force of the transfer cylinder relative to the plate cylinder, is set smaller than the pressing force of the impression cylinder against the transfer cylinder. 2. A stencil printing apparatus according to claim 1, wherein said heating means heats the entire transfer cylinder. 3. The stencil printing apparatus according to claim 1, wherein said heating means is provided inside said transfer cylinder. 4. The stencil printing apparatus according to claim 1 , wherein the ink is an emulsion ink .

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