JP2010017967A - Thermosensitive stencil printing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that sufficient boring state can not be obtained in enhancing further image quality separately for each subscanning directional resolution when a data obtained simply by a proportional conversion based on a data for boring energy of low resolution is used as a data for master boring energy of high resolution, the problem that setting separately for each subscanning directional resolution can not be performed in the case of setting change of the initial value, and the problem that the optimal image quality can not be obtained separately for each sub-scanning directional resolution and for each thermal head temperature. <P>SOLUTION: A proper boring energy is computed by multiplying a reference data stored in a data table means for storing a reference boring energy by a unique multiplying factor peculiar to the printing apparatus as an internal processing of a microcomputer 20, and a printing plate is produced using the boring energy. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a heat-sensitive stencil printing apparatus, and more specifically, a print image can be formed with two or more sub-scanning resolutions with a single thermal head, and further, optimal printing is performed by reliably punching a heat-sensitive stencil master. The present invention relates to a thermal stencil printing apparatus capable of obtaining an image.

  In the heat-sensitive stencil printing apparatus, a driving means for driving the master conveying means so as to move the heat-sensitive stencil master with a predetermined feed pitch, a sub-scanning direction resolution setting means for setting the resolution in the sub-scanning direction, and the sub-scanning direction Based on the signal of the resolution setting means, according to the signal of the drive control means for controlling the drive means to change the feed pitch corresponding to the set resolution in the sub-scanning direction, and the signal of the sub-scanning direction resolution setting means, There is a punching energy adjusting means for adjusting the punching energy supplied to each heat generating part of the thermal head to a predetermined energy, and the dimension in the sub-scanning direction of the heat generating part is set by the sub-scanning direction resolution setting means. A thermal stencil printing apparatus corresponding to the highest possible resolution and below the feed pitch length has been filed by the same applicant as the present invention. That (see Patent Document 1).

  The invention of the above-mentioned patent document 1 is a thermal stencil printing in which perforation of a heat-sensitive stencil master is independent without being connected in the main scanning direction and the sub-scanning direction, and an optimum perforation state is obtained corresponding to the resolution in the set sub-scanning direction. An object is to provide an apparatus.

  In order to achieve the object, in a state where a thermal stencil master having at least a thermoplastic resin film is pressed by a platen roller against a thermal head having a large number of heating portions arranged in the main scanning direction. In addition, the thermosensitive stencil master is moved by the master conveying means in the sub-scanning direction orthogonal to the main scanning direction, while the heat generating portion is heated according to the image signal, and the thermoplastic resin film is selectively melt-pierced. Thus, a perforation pattern corresponding to the image signal is obtained, and the heat-sensitive stencil master is wound around the outer peripheral surface of the printing drum, ink is supplied from the inner peripheral side of the printing drum, and the ink oozes out through the perforation pattern. A thermal stencil printing apparatus for forming an ink image corresponding to the image signal on the printing paper by using the ink, the driving means, the sub-scanning direction resolution setting means, and the driving Control means and perforation energy adjustment means, and the dimension of the heat generating portion in the sub-scanning direction is made equal to or less than the length of the feed pitch corresponding to the highest resolution that can be set by the sub-scanning direction resolution setting means. Yes.

  However, in the above invention, no consideration is given to the way of the drilling energy data. As the high-resolution drilling energy data, the punching energy at the low resolution set by the sub-scanning direction resolution setting means is used. Based on the data for use, a simple proportional conversion was used.

  Thus, based on the drilling energy data at the low resolution set by the sub-scanning direction resolution setting means, when using the high resolution drilling energy data created simply by proportional conversion, A heat-sensitive stencil master used in a recent heat-sensitive stencil printing apparatus, aiming at high image quality by using a heat-sensitive stencil master provided with at least one coating layer of a thermoplastic resin film and a porous resin film. In some cases, such a drilling energy never gives a satisfactory drilling state.

  In addition, a thermal stencil printing machine is actually installed at the customer's location, and a service person visits the site to change the initial value related to the punching energy adjustment means in each thermal stencil printing machine according to the sub-scanning direction resolution. There is a problem in that it cannot be set and optimum print image quality cannot be obtained for each resolution in the sub-scanning direction.

Japanese Patent No. 2960863

  The present invention has been made under the circumstances described above, and there was no problem at the time of filing of Patent Document 1, but in using a heat-sensitive stencil master that can achieve high image quality in recent years, No consideration is given to the way of the drilling energy data of the above, and the high-resolution drilling energy data is simply used for drilling energy at a low resolution set by the sub-scanning direction resolution setting means. When adjusting the drilling energy when using the same proportional constant based on the data, the drilling energy is suitable for further improving the image quality according to the resolution in the sub-scanning direction. The problem that the state cannot be obtained, and the thermal stencil printing machine was actually installed at the customer's location, and a service person etc. visited and the thermal stencil printing machine at each thermal stencil printing machine When changing the setting of the initial value related to the hole energy adjusting means, it is not possible to set for each sub-scanning direction resolution, and the optimum print image quality cannot be obtained for each sub-scanning direction resolution and for each thermal head temperature. It is an object to provide a thermal plate-making printing apparatus that can be solved.

In order to achieve the above object, an invention according to claim 1 is directed to a thermal head having a plurality of heat generating portions arranged in the main scanning direction. While the roller is pressed, the heat-sensitive stencil master is moved by the master conveying means in the sub-scanning direction orthogonal to the main-scanning direction, and the heat-generating portion is caused to generate heat according to the image signal, so that the thermoplastic resin film Position-selectively melt-piercing to obtain a punching pattern corresponding to the image signal, winding the heat-sensitive stencil master around the outer peripheral surface of the printing drum, supplying ink from the inner peripheral side of the printing drum, A thermal stencil printing apparatus for forming an ink image corresponding to the image signal on the printing paper with ink that has oozed through a perforation pattern,
Driving means for driving the master conveying means so as to move the thermosensitive stencil master with a predetermined feed pitch, sub-scanning direction resolution setting means for setting the resolution in the sub-scanning direction, and sub-scanning direction resolution setting means On the basis of this signal, a drive control means for controlling the drive means so as to change the feed pitch corresponding to the set resolution in the sub-scanning direction, and the thermal head in accordance with the signal from the sub-scanning direction resolution setting means In the heat sensitive stencil printing apparatus having the perforation energy adjusting means for adjusting the perforation energy supplied to the individual heat generating parts to a predetermined energy,
Reference drilling energy storage in which drilling energy data is stored for each thermal head temperature as reference data for a predetermined resolution in the sub-scanning direction is provided as a drilling energy data table in the punching energy adjusting means. Based on the data table of the data table means and the data table of the reference drilling energy storage data table means, a ratio value for calculating the drilling energy corresponding to the resolution setting value in the sub-scanning direction based on the data table, The perforation energy ratio value means for each sub-scanning direction resolution can be set for each resolution setting value in the sub-scanning direction and for each temperature of the thermal head within the setting range of the perforation energy adjusting means. And provided.
The invention according to claim 2 is the heat-sensitive stencil printing apparatus according to claim 1,
As the setting range in the perforation energy adjusting means, there is provided a per-scanning direction per-resolution perforation energy setting range setting means capable of setting a unique value for each resolution setting value in the sub-scanning direction.
The invention according to claim 3 is the thermal stencil printing apparatus according to claim 1 or 2,
Based on the data table of the reference punching energy storage data table means, the punching energy data for each sub-scanning direction resolution calculated based on the above unique ratio value set by the punching energy ratio value means for each sub-scanning direction resolution. Based on the above, the energy correction was made by taking into account the print rate rank classification at the time of plate making with the thermal head.
The invention according to claim 4 is the heat-sensitive stencil printing apparatus according to any one of claims 1 to 3,
Based on the data table of the reference punching energy storage data table means, the punching energy data for each sub-scanning direction resolution calculated based on the above unique ratio value set by the punching energy ratio value means for each sub-scanning direction resolution. Based on the above, perforation energy setting means for each ink type that can set the converted perforation energy set value according to the type of ink for the heat-sensitive stencil machine to be used is provided.
According to a fifth aspect of the present invention, in the thermal stencil printing apparatus according to any one of the first to fourth aspects, the perforation energy ratio value means by sub-scanning direction resolution is based on the data table of the reference perforation energy storage data table means. Based on the perforation energy data for each resolution in the sub-scanning direction calculated based on the original ratio value set in step 1, set the converted perforation energy setting value according to the type of thermal stencil drum used. A perforating energy setting means for each printing drum that can be used is provided.
The invention according to claim 6 is the thermal stencil printing apparatus according to any one of claims 1 to 5,
Ink temperature detecting means for detecting the ink temperature of the ink used in the thermal stencil printing apparatus is provided, and it has a perforation energy adjusting means for each ink temperature for adjusting to the optimum perforation energy corresponding to the detected ink temperature; did.
According to a seventh aspect of the present invention, in the heat-sensitive stencil printing apparatus according to any one of the first to sixth aspects, an ink saving mode setting means capable of reducing ink consumption is provided.
The invention according to claim 8 is the heat-sensitive stencil printing apparatus according to claim 7,
The ink-saving mode setting means discriminates between the normal mode and the ink-saving mode, and the original perforation energy setting value in the normal mode and the ink-saving mode can be set.
The invention according to claim 9 is the heat-sensitive stencil printing apparatus according to any one of claims 1 to 8,
When a heat-sensitive stencil master provided with at least one coating layer of a thermoplastic resin film and a porous resin film is used, a perforation energy data table suitable for this master is used.

In the invention according to claim 1, if there is at least one reference perforation energy data, by setting a unique ratio value for each resolution setting value in the sub-scanning direction and for each temperature of the thermal head, It is possible to adjust the drilling energy that can be used in all cases, such as the type of master, thermal head thermal efficiency variation, and user requirements, and supply it to the heat generating part of the thermal head, resulting in a resolution in the sub-scanning direction. In addition, it is possible to obtain a suitable perforated state, and in each sub-scanning direction resolution, the print image quality is deteriorated due to the perforation failure peculiar to the thermal stencil printer, and the second quality is the specific offset of the thermal stencil printer. Therefore, it is possible to obtain a print image quality that is higher than the print image quality of the prior art.
In the invention according to claim 2, since the unique perforation energy value can be set for each resolution setting value in the sub-scanning direction as the setting range in the perforation energy adjusting means, an appropriate range suitable for perforation is set for each resolution setting value. By setting, it is possible to eliminate excessive punching, poor punching, and the like, and it is possible to obtain a suitable print image for each resolution setting value.
In the invention of claim 3, the larger the number of simultaneously driven heating elements when making a plate with a thermal head, the greater the voltage drop at the thermal head driving unit and the greater the influence on the perforated state. Since energy correction is performed in consideration of the printing rate rank classification at the time of plate making, the influence of the perforated state can be reduced.
In the invention according to the fourth aspect, since the converted perforation energy can be set depending on the type of ink for the thermal stencil printing machine to be used, it is possible to reduce the influence of the amount of ink discharged from the perforated part depending on the type of ink.
According to the fifth aspect of the present invention, the converted perforation energy can be set depending on the type of the drum for the thermal stencil printing machine to be used, so that the influence of the rigidity of the drum that varies depending on the type of the printing drum can be reduced.
According to the sixth aspect of the present invention, it is possible to obtain a perforation state corresponding to the ink temperature by setting an optimum perforation energy corresponding to the detected ink temperature, and a suitable print image is obtained for each resolution setting value. It becomes possible.
According to the seventh aspect of the present invention, it is possible to reliably reduce the amount of ink consumed even if the resolution in the sub-scanning direction is changed.
In the invention according to claim 8, it is possible to reliably reduce the ink consumption while maintaining the print image quality.
In the invention of claim 9, since it is a plate making using a master provided with at least one coating layer of a thermoplastic resin film and a porous resin film, a good perforation state can be obtained, and each resolution setting value A suitable print image can be obtained every time.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Configuration of heat-sensitive stencil printing apparatus suitable for carrying out the present invention>
FIG. 1 shows a thermal stencil printing apparatus according to an embodiment of the present invention. First, the overall configuration of this thermal stencil printing apparatus and its stencil printing process will be briefly described with reference to FIG.

  Reference numeral 50 denotes an apparatus main body cabinet. A portion indicated by reference numeral 80 in the upper part of the apparatus main body cabinet 50 constitutes a document reading section, a portion indicated by reference numeral 90 below the plate making plate feeding section, and a portion indicated by reference numeral 100 on the left side thereof is a porous printing drum. 101, a portion indicated by reference numeral 70 on the left side of the printing drum portion, a portion indicated by reference numeral 110 below the plate-making plate feeding portion 90, and a portion indicated by reference numeral 110 below the plate making and feeding portion 90, and a portion indicated by reference numeral 120 below the printing drum 101. Indicates a printing part, and a portion denoted by reference numeral 130 in the lower left of the apparatus main body cabinet 50 indicates a paper discharge part.

  Next, the operation of this heat-sensitive stencil printing apparatus will be described below, including its detailed configuration.

  First, a document 60 having an image to be printed is placed on a document placing table (not shown) arranged at the top of the document reading unit 80, and a plate making start key (not shown) is pressed. Along with the pressing of the plate making start key, a plate removing process is first executed. That is, in this state, the used heat-sensitive stencil master 61b used in the previous printing remains attached to the outer peripheral surface of the printing drum 101 of the printing drum unit 100.

  First, when the printing drum 101 rotates counterclockwise and the rear end of the used heat-sensitive stencil master 61b on the outer peripheral surface of the printing drum 101 approaches the plate release roller pair 71a, 71b, the roller pair 71a, 71b While rotating, the rear end of the used heat-sensitive stencil master 61b is scooped up by one of the discharge plate peeling rollers 71a, and the discharge plate roller pairs 73a and 73b and the discharge plate peeling roller pair disposed on the left side of the discharge plate peeling roller pair 71a and 71b. While being conveyed in the direction of the arrow Y1 by the pair of ejected conveying belts 72a and 72b spanned between 71a and 71b, it is ejected into the ejected box 74, and the used heat-sensitive stencil master 61b is pulled from the outer peripheral surface of the printing drum 101. It is peeled off and the plate removal process is completed. At this time, the printing drum 101 continues to rotate counterclockwise. The used heat-sensitive stencil master 61 b that has been peeled and discharged is then compressed inside the discharge plate box 74 by the compression plate 75.

  In parallel with the plate removal process, the document reading unit 80 reads the document. That is, the document 60 placed on a document placing table (not shown) is transported in the directions of arrows Y2 to Y3 by the rotation of the separation roller 81, the pair of front document transport rollers 82a and 82b, and the pair of rear document transport rollers 83a and 83b. It is used for exposure reading. At this time, when there are a large number of documents 60, only the lowermost document is conveyed by the action of the separating blade 84. The rear document transport roller 83a is driven to rotate by a document transport roller motor 83A, and the front document transport roller 82a is passed through a timing belt (not shown) spanned between the transport rollers 83a and 82a. The rollers 82b and 83b are driven to rotate, respectively. When reading the image of the original 60, the reflected light from the surface of the original 60 illuminated by the fluorescent lamp 86 while being conveyed on the contact glass 85 is reflected by a mirror 87 and passed through a lens 88 from a CCD (charge coupled device) or the like. This is performed by entering the image sensor 89. That is, the document 60 is read by a known “reduction-type document reading method”, and the document 60 from which the image has been read is discharged onto the document tray 80A. The electrical signal photoelectrically converted by the image sensor 89 is input to an analog / digital (A / D) conversion board (not shown) in the apparatus body cabinet 50 and converted into a digital image signal.

  On the other hand, in parallel with this image reading operation, plate making and plate feeding processes are performed based on the digital signalized image information. That is, the heat-sensitive stencil master 61 set at a predetermined portion of the plate-making plate feeding unit 90 is pulled out from a roll state wound in a roll shape and pressed against the thermal head 30 via the heat-sensitive stencil master 61. By the rotation of the platen roller 92 as the conveying means and the pair of feed rollers 93a and 93b, the platen roller 92 is intermittently conveyed to the downstream side of the conveying path. With respect to the heat-sensitive stencil master 61 transported in this way, a large number of minute heat generating portions arranged in a line in the main scanning direction of the thermal head 30 are digital image signals sent from the A / D conversion board. The thermoplastic resin film of the heat-sensitive stencil master 61 that is selectively heated according to the heat generated and is in contact with the generated heat generating portion is melt-pierced. In this way, image information is written as a perforation pattern by position-selective melt perforation of the heat-sensitive stencil master 61 according to the image information.

  The front end of the pre-pressed heat-sensitive stencil master 61a in which image information is written is sent out toward the outer peripheral side of the printing drum 101 by a pair of plate feeding rollers 94a and 94b, and the traveling direction is changed downward by a guide member (not shown). Then, it hangs down toward the expanded master clamper 102 (shown in phantom) of the printing drum 101 in the plate feeding position state shown in the figure. At this time, the used heat-sensitive stencil master 61b has already been removed from the printing drum 101 by the plate discharging process.

  Then, when the leading end of the plate-making heat-sensitive stencil master 61a is clamped by the master clamper 102 at a fixed timing, the printing drum 101 rotates on the outer peripheral surface while rotating in the direction A (clockwise direction) in the figure. The stencil master 61a is gradually wound. The rear end portion of the plate-making heat-sensitive stencil master 61a is cut into a fixed length by the cutter 95 after the plate-making is completed.

  When one plate-made heat-sensitive stencil master 61a is wound around the outer peripheral surface of the printing drum 101, the plate-making and plate-feeding steps are finished, and the printing step is started. First, the uppermost one of the printing papers 62 stacked on the paper feed tray 51 is sent in the direction of arrow Y4 toward the feed roller pair 113a, 113b by the paper feed roller 111 and the separation roller pair 112a, 112b. Further, the feed roller pair 113a, 113b is sent to the printing pressure unit 120 at a predetermined timing synchronized with the rotation of the printing drum 101. When the fed printing paper 62 comes between the printing drum 101 and the press roller 103, the press roller 103 that has been separated below the outer peripheral surface of the printing drum 101 is moved upward, whereby the printing drum 101. It is pressed by the pre-pressed heat-sensitive stencil master 61a wound around the outer peripheral surface. In this way, ink oozes out from the perforated portion of the printing drum 101 and the perforated pattern portion (not shown) of the pre-printed heat-sensitive stencil master 61a, and the oozed ink is transferred to the surface of the printing paper 62 to produce a printed image. As a result, an ink image is formed.

  At this time, on the inner peripheral side of the printing drum 101, ink is supplied from the ink supply pipe 104 to the ink reservoir 107 formed between the ink roller 105 and the doctor roller 106, and is in the same direction as the rotation direction of the printing drum 101. Ink is supplied to the inner peripheral side of the printing drum 101 by the ink roller 105 that is in contact with the inner peripheral surface while rotating in synchronization with the rotation speed of the printing drum 101. The ink is a W / O type emulsion ink.

  The printing paper 62 on which a printing image is formed in the printing pressure unit 120 is peeled off from the printing drum 101 by the paper discharge peeling claw 114 and sucked by the suction fan 118, while the suction paper discharge inlet roller 115 and the suction paper discharge outlet roller. By the rotation of the conveyor belt 117 stretched around 116 in the counterclockwise direction, the conveyor belt 117 is conveyed toward the sheet discharge unit 130 as indicated by an arrow Y5 and sequentially discharged and stacked on the sheet discharge table 52. In this way, so-called trial printing is completed.

  Next, when the number of prints is set with a numeric keypad (not shown) and a print start key (not shown) is pressed, the steps of paper feeding, printing, and paper discharge are repeated for the set number of prints in the same process as the above-described trial printing. All the processes of stencil printing are completed.

  In the stencil printing apparatus, the image density of the printed image is determined by the amount of ink that oozes from the heat-sensitive stencil master 61. The amount of ink that oozes out from the heat-sensitive stencil master 61 is proportional to the area of the individual micro-perforations that form the perforation pattern formed on the heat-sensitive stencil master 61, that is, the size of the perforations. Further, the size of the perforations is proportional to the perforation energy corresponding to the temperature of each heat generating part of the thermal head. Therefore, the size of the perforation of the perforation pattern for obtaining an optimal printed image can be determined by adjusting the perforation energy corresponding to the temperature of each heat generating portion of the thermal head.

<Control system of thermal stencil printing machine>
A control configuration for changing the resolution in the sub-scanning direction, and a configuration for driving and controlling the thermal head 30, the master feed motor 40, and the document transport roller motor 83A will be described.

  In FIG. 2, reference numeral 20 denotes a microcomputer as control means. The microcomputer 20 transmits and receives command signals and data signals among the thermal head drive circuit 27, the master feed motor drive circuit 41, the document transport roller motor drive circuit 83B, and the sub-scanning direction resolution setting key 10, and makes thermal stencil printing. Controls the entire system.

  The microcomputer 20 includes a CPU (central processing unit), an I / O (input / output) port, a ROM (read-only storage device), a RAM (read / write storage device), and the like, and is well-known connected by a signal bus. It has a configuration.

  The microcomputer 20 is based on the output signal of the sub-scanning direction resolution setting key 10, based on the output signal from the sub-scanning direction resolution setting key 10, drive control means for controlling the master feed motor 40 so as to change the feed pitch to the sub-scanning direction resolution, Based on the output signal of the setting key 10, the second drive control means for controlling the document conveying roller motor 83A so as to change the feed pitch corresponding to the set resolution in the sub-scanning direction, and the sub-scanning direction resolution setting key 10 In response to the output signal, the drilling energy adjusting means for adjusting the drilling energy supplied to each heat generating part of the thermal head 30 to a predetermined energy is provided. The thermal head drive circuit 27 can also be configured to constitute a drilling energy adjusting means together with the microcomputer 20.

  In the ROM of the microcomputer 20, relational data for setting a feed pitch corresponding to the set resolution in the sub-scanning direction, a program for energy adjustment, and an optimum according to the set resolution in the sub-scanning direction The relationship data of the energization pulse width corresponding to the drilling energy for forming a drilling of a large size is experimentally determined and stored in advance.

  The sub-scanning direction resolution setting key 10 is connected to the microcomputer 20, and the output of the set resolution in the sub-scanning direction is displayed on the LED 11 and input to the I / O port of the microcomputer 20.

  In FIG. 2, reference numeral 25 denotes a decoding circuit, reference numeral 26 denotes a power source, reference numeral 27 denotes a thermal head driving circuit, reference numeral 41 denotes a master feed motor driving circuit, and reference numeral 83B denotes a document conveying roller motor driving circuit.

  The decoding circuit 25 has a function of decoding the image signal digitally encoded by the analog / digital (A / D) conversion board into an image data signal, and outputs the image data signal to the thermal head driving circuit 27.

  The master feed motor drive circuit 41 supplies the master feed motor 40 with the output of the 1-2 phase excitation circuit that generates the 1-2 phase excitation pulse. The master feed motor drive circuit 41 is connected to the master feed motor 40 and drives the master feed motor 40.

  The document transport roller motor drive circuit 83B has the same configuration as the master feed motor drive circuit 41, and supplies the output of the 1-2 phase excitation circuit that generates the 1-2 phase excitation pulse to the document transport roller motor 83A. It is supposed to be.

  The thermal head drive circuit 27 receives an image data signal output from the decoding circuit 25, a signal indicating one sub-scan, and an energization pulse width command and data signal output from the microcomputer 20, and outputs a thermal head drive signal. It is mainly composed of an output drive circuit.

  The thermal head 30 drives only a shift register that sequentially shifts image data signals for one main scan, a latch circuit that latches the output of each stage of the shift register, and a heat generating portion of the thermal head 30 corresponding to a black pixel. And a transistor for driving the heat generating part of the thermal head 30.

  The power source 26 is connected to the thermal head drive circuit 27, and transmits the signal to the thermal head drive circuit 27 and generates energy for punching for melting and punching the heat-sensitive stencil master 61 in each heat generating portion of the thermal head 30. Supply the corresponding electrical energy.

An example of changing the resolution in the sub-scanning direction and its operation process will be described.
First, before executing the plate making process by pressing the plate making start key described above, the sub scanning direction resolution setting key 10 is pushed to set the desired resolution in the sub scanning direction as a print image. When the resolution setting signal in the sub-scanning direction is output to the microcomputer 20, the microcomputer 20 sends a predetermined feed pitch setting signal corresponding to the resolution in the sub-scanning direction to the master feed motor drive circuit 41. Then, a signal for driving and controlling the document conveying roller motor 83A is sent to the document conveying roller motor driving circuit 83B at a predetermined feed pitch corresponding to the resolution in the sub-scanning direction. At the same time, the microcomputer 20 sends to the thermal head drive circuit 27 a signal for setting an energization pulse width for forming a perforation having an optimum size according to the set resolution in the sub-scanning direction. Then, based on a predetermined feed pitch setting signal corresponding to the sub-scanning direction resolution set by the microcomputer 20, the master feed motor 40 is driven via the master feed motor drive circuit 41, and the master feed motor 40 further drives the platen. The roller 92 is driven to rotate, and the heat-sensitive stencil master 61 is conveyed at a predetermined feed pitch and speed.

  Further, based on a predetermined feed pitch setting signal corresponding to the sub-scanning direction resolution set by the microcomputer 20, the document transport roller motor 83A is driven via the document transport roller motor drive circuit 83B, and further the document transport. The pair of front and rear document transport rollers 82a, 82b, 83a, 83b are rotationally driven by the roller motor 83A, and the document 60 is transported at a predetermined feed pitch and speed.

  In this way, the thermal head drive circuit 27 receives the power supply from the power supply 26 based on the energization pulse width setting signal, generates an energization pulse (thermal head drive signal), and outputs it to each heat generating part of the thermal head 30. Then, the heat generating portion corresponding to the black pixel generates Joule heat, and the heat-sensitive stencil master 61 is melt-punched.

<Example corresponding to claim 1>
The sub-scanning direction resolution setting means for setting the resolution in the sub-scanning direction according to claim 1 will be described with reference to FIG. A sub-scanning direction resolution setting key 10 as sub-scanning direction resolution setting means for setting the resolution in the sub-scanning direction of the ink image is disposed on an operation panel (not shown) on the upper part of the apparatus main body cabinet 50. The sub-scanning direction resolution setting key 10 has a function similar to that of a fine mode setting key in, for example, a copying machine, and the user can set the resolution in the sub-scanning direction of the ink image on the printing paper 62. Any desired resolution can be manually input and set.

  Each time the sub-scanning direction resolution setting key 10 is pressed in this example, the resolution in the sub-scanning direction is set to 400 DPI as an example of low resolution (normal plate making), or 600 DPI (dot / dot) as an example of high resolution, for example. Inch) can be switched to two levels.

  On the operation panel near the sub-scanning direction resolution setting key 10, two LEDs (light emitting diodes) 11 for displaying the resolution setting in the sub-scanning direction of 400 dpi and 600 dpi are arranged in order from the left in the figure. Yes.

  Although described as a setting key, a touch panel may be used instead, and a sub-scanning resolution setting value may be displayed on the touch panel.

  Next, as a control target of the drive control means for controlling the drive means to change the feed pitch corresponding to the set resolution in the sub-scanning direction based on the signal of the sub-scanning direction resolution setting means, as shown in FIG. Further, a platen roller 92 is connected to the master feed motor 40 as the driving means via a timing belt (not shown). The master feed moke 40 is a stepping smoke and is driven to rotate intermittently. Therefore, the heat-sensitive stencil master 61 is moved in the sub-scanning direction orthogonal to the main scanning direction by the master feed motor 40 via the platen roller 92 with a predetermined feed pitch.

The thermal head 30 has a resolution of at least 400 dpi to 600 dpi, and a so-called rectangular heating element is used for minute heating portions arranged in the main scanning direction (direction perpendicular to the drawing sheet). .
Further, based on the signal from the sub-scanning direction resolution setting means, the required heat generation power is given to the thermal head for punching. As a method of applying energy for punching a thermal head, generally, the heat generation time Tp is variable, and when the resolution is high, the heat generation time Tp is generally shortened. At that time, the voltage Vhd is variable. You can change it.

  Next, the perforation energy storage data table by resolution in the sub-scanning direction will be described. The per-scanning-direction resolution perforation energy storage data table is stored in the storage medium of the control means (microcomputer 20) or a peripheral storage medium, read out based on the signal of the sub-scanning direction resolution setting means, and the sub-scanning resolution level. Depending on the temperature of the thermal head and the thermal head temperature, the perforation energy is selected and a suitable perforation energy is applied to the thermal head. The sub-scanning direction resolution setting means can set the resolution in a plurality of sub-scanning directions such as the normal mode and the high-density mode.

(Comparative example)
FIG. 3 is an example of a perforation energy resolution-specific perforation energy data table as a conventional perforation energy setting means shown as a comparative example. The characteristics when the vertical axis is the drilling energy, the horizontal axis is the thermal head temperature, and the resolution is low as the resolution in the sub-scanning direction are obtained from experiments, actual measurements, and the inclination is indicated by the characteristic line L1.

  On the other hand, the characteristic line in the case of a high resolution as the resolution in the sub-scanning direction is conventionally determined based on the slope of the low resolution indicated by the characteristic line L1 without being obtained by experiments or the like as in the case of a low resolution. It was obtained by conversion, and drilling was performed with the drilling energy determined by the characteristic line L2. Although the characteristic line L2 in FIG. 3 is visualized for convenience of explanation, it does not exist as a data table, and is only a value calculated by uniform ratio conversion based on the data of the characteristic line L1 as described above. Absent.

  However, when plate making is performed with the perforation energy set by the characteristic line L2 calculated in the above uniform ratio conversion, it is optimal for each environment to achieve high image quality with a heat-sensitive stencil master used in a recent heat-sensitive stencil printing apparatus. Therefore, it was not possible to achieve a further high image quality with a heat-sensitive stencil master capable of achieving a high perforated state and a high image quality at the corners.

(Example of the present invention)
Therefore, in the present invention, for example, data as indicated by the characteristic line L10 in FIG. 4 is provided as a drilling energy data table in the drilling energy adjusting means. The data indicated by the characteristic line L10 is provided as data serving as a reference for a predetermined resolution in the sub-scanning direction (hereinafter referred to as reference data). For example, the characteristic line L1 in FIG. 3 can be used. The characteristic line L1 is a function expression of the drilling energy with respect to the thermal head temperature. In the simplest example, there is only one reference data as in this example, but a plurality of reference data can be set.

The reference data is stored in the reference drilling energy storage data table means as the drilling energy value for each thermal head temperature. Assuming that the characteristic line L10 is stored as reference data (piercing energy data) stored in the reference punching energy storage data table means, for example, data for low resolution in the sub-scanning direction, high resolution in the sub-scanning direction. As the data for setting the perforation energy, a ratio value as an initial value is determined for this characteristic line L10 for each resolution in the sub-scanning direction and for each thermal head temperature. As this initial value, in this example, a ratio value is stored so as to obtain the average high resolution perforation energy obtained by experiments or the like.
However, when printing is performed with the perforation energy calculated with the ratio value as the initial value, a mismatch may occur due to factors such as variations in the thermal head and the like, and the finished state of printing may be impaired.
Therefore, in the form of correcting the ratio value as the initial value, a unique ratio value is set for each thermal head temperature within the setting range of the punching energy adjusting means, for example, within the punching energy variable range shown in FIG. Then, the plate is printed with the high resolution perforation energy in the sub-scanning direction calculated by multiplying the unique ratio value by the data of the characteristic line L10.
This unique ratio value is a ratio value that matches the actual printing status of the printing device, and is set based on empirical or experimental results. For example, it reflects factors such as variations in thermal heads, etc. It will be a thing.
By changing the unique ratio value to an appropriate value, printing with a desired quality can be obtained in printing at any resolution in the sub-scanning direction in an actual printing apparatus.

Specifically, a service person or the like inputs a unique ratio value by key input using an operation unit (not shown), and the unique ratio value is stored. At the time of plate making, a subordinate value is stored based on the stored unique ratio value. As the internal processing of the microcomputer 20 functioning as the perforation resolution-specific perforation energy ratio value means and perforation energy adjustment means, the perforation energy is set by multiplying the unique ratio value by the above-mentioned reference data, and the plate making is performed. The feature of this example is that unique ratio values can be set for each resolution in the sub-scanning direction and for each thermal head temperature, and drilling is performed with the drilling energy calculated by multiplying this ratio value.
In this example, the reference data is the low-resolution characteristic line L10 that can be set by the sub-scanning direction resolution setting means. However, the reference data is not limited to this and may be data dedicated to calculation that cannot be set by the sub-scanning direction resolution setting means. . That is, the perforation energy of the characteristic line L10 and the characteristic line L20 may be calculated by multiplying the reference data dedicated for calculation by a ratio value for each resolution.

  In the example of FIG. 4, if the characteristic line L10 is, for example, low-resolution perforation energy data, the characteristic line L10 is low for each sub-scanning resolution set by the sub-scanning direction resolution setting means (sub-scanning direction resolution setting key 10). In the case of resolution, drilling is performed with the drilling energy based on the data of the characteristic line L10. In the case of high resolution, drilling is performed with the drilling energy obtained by multiplying the unique ratio value for each thermal head temperature regardless of the characteristic line L10. It was. The drilling energy value calculated in this way is shown by a characteristic line L20 in FIG. However, although the characteristic line L20 is visualized for convenience of explanation, it does not exist as a data table and is merely a value calculated individually based on the data of the characteristic line L10.

  In FIG. 4, the characteristic line L20 at the time of high resolution is not proportionally converted to the characteristic line L10 at the time of low resolution. Unlike the characteristic line L2 at the high resolution, which is parallel to the characteristic line L1 at the low resolution, the characteristic line L20 is not parallel to the characteristic line L10.

  As described above, it is optional to use measured data with low resolution as the characteristic line L10 as a base. However, the characteristic line L10 is not limited thereto, and may be an arbitrary function straight line (curve), or such a constant line It does not have to be of a nature that complies with the definition. Whatever the data, the target drilling energy value can be calculated depending on the setting of the unique ratio value.

  Based on the signal from the sub-scanning direction resolution setting means, the sub-scanning-direction resolution-specific perforation energy ratio value means stores the set data in the sub-scanning direction resolution-specific perforation energy storage data table means for each sub-scanning direction resolution. In contrast, a unique value can be set as a multiplication factor. This is because the thermal efficiency of the thermal head itself mounted on the thermal stencil printing machine has individual variations due to variations in the thickness of the glaze layer provided in the thermal head, variations in the thickness of the protective film, variations in the dimensions of the heating resistor, etc. In order to reduce the difference in the drilling state due to the variation in thermal efficiency, it may be changed according to the request from each user.

  For example, in sub-scanning direction resolutions of 400 DPI and 600 DPI, it is variable (specifically, as a perforated state, each adjacent dot is in a so-called “not connected state”, and “perforation not perforated” is perforated. As a range of energy conditions in which the defect can be varied within an allowable level, 400 DPI with a large perforation state is wider, and one ratio value cannot be set as each optimum ratio value regardless of the resolution in the sub-scanning direction. . Therefore, it was decided that a unique ratio value could be set for each resolution. In addition, a unique ratio value can be set for each thermal head temperature with respect to the drilling energy data of each resolution-specific data. Thereby, an optimal ratio value can be set and the drilling state can be finely adjusted.

  Note that this function is used when the plate making / printing is actually performed to correct the print image quality (excess density / deficiency, conspicuous missing tooth image, etc.). For example, to reduce the effect of thermal head variation in thermal efficiency, or to reduce the effect of surface smoothness variation that affects the punchability of the master, a behind function (serviceman mode, etc.) that is not normally used ). In addition, the settable range is determined by examining each specification or lot variation and performing evaluation confirmation.

  In this example, it becomes possible to reduce the difference in the perforation state due to the thermal efficiency variation of the thermal head itself mounted on the thermal stencil printing apparatus, and also according to the request from each user etc. It becomes possible to change.

(Example corresponding to claim 2)
As the setting range in the perforation energy adjusting means, there is provided sub-scanning direction per-resolution perforation energy setting range setting means capable of setting a unique value for each resolution setting value in the sub-scanning direction. The unique value is set by the microcomputer 20 functioning as a perforation energy setting range setting unit for each sub-scanning direction resolution. The feature of this example is that a unique perforation energy value can be set for each sub-scanning direction resolution.

  In accordance with a signal from the sub-scanning direction resolution setting means, there is a perforation energy adjusting means for adjusting the perforation energy supplied to each heat generating part of the thermal head to a predetermined energy, and as a setting range in the perforation energy adjusting means The sub-scanning direction resolution-specific perforation energy setting range setting means can set a unique perforation energy value for each resolution setting value in the sub-scanning direction.

  When the resolution in the sub-scanning direction is different, the range that can be varied by the perforation energy storing data table means by sub-scanning direction resolution is substantially different. For example, when the resolution in the sub-scanning direction is low, the range that can be varied is wider than when the resolution is high. This is larger in the perforated state of the thermoplastic resin film in the heat-sensitive stencil master as described later in FIG. 5 than in the case of high resolution in the case of low resolution, and the range in the direction of enlargement is particularly large. Because of this, the variable range is also large. Therefore, if the variable ranges (upper limit value and lower limit value) are made the same in this way, it depends on whether the adjustment is made to the low resolution side or the high resolution side in the sub-scanning direction. The separability of the state is not maintained, and the increase in the set-back characteristic of the thermal stencil printing machine, the deterioration of image size reproducibility due to sticking, the image elongation due to the deterioration of printing durability, the width of the horizontal line, etc. In the opposite case, the print image quality is deteriorated due to poor punching, the print image density is insufficient, and in the worst case, characters are lost.

  Therefore, the above-mentioned problem can be solved by providing a perforation energy setting range setting means for each sub-scanning direction resolution that can set a unique value for each resolution setting value in the sub-scanning direction, and providing a suitable appropriate range.

  FIG. 5 represents the variable range of drilling energy. The left bidirectional arrow indicates the settable range when the resolution in the sub-scanning direction is low, and the right bidirectional arrow indicates the settable range when the resolution is high.

  In the case of low resolution, the perforation energy that can ensure perforation separation (that is, independent perforation is maintained) is at a higher level as the upper limit of the perforation energy than in the case of high resolution.

  On the other hand, as the perforation probability (that is, the probability that an unperforated part can be accepted as the perforated state of the thermoplastic resin film provided in the heat-sensitive stencil master), the print image quality required for high resolution is still low. For the reason that it is higher than the case of resolution, the setting energy in the case of high resolution tends to be higher than the case of low resolution as the perforation probability securing lower limit region.

In FIG. 6 schematically showing the perforated state of the heat-sensitive stencil master, the perforated dot arrangement shown in each of the diagrams (a) -1, (a) -2, (b) -1, and (b) -2 The horizontal direction is the main scanning direction, and the vertical direction is the sub-scanning direction. The pitch of the punched dots in the main scanning direction is the same in each figure, and the punched dot pitch in the sub-scanning direction is (a) -1 ( b) for a) -2, b 'for high resolution (b) -1 and (b) -2 in the sub-scanning direction, and b>b'.
(A) -1 is low resolution in the sub-scanning direction and the perforation diameter is large.
(A) -2 is a case where the resolution is low in the sub-scanning direction and the drilling diameter is the minimum limit,
(B) -1 is high resolution in the sub-scanning direction and the perforation diameter is large.
(B) -2 is when the resolution is high in the sub-scanning direction and the perforation diameter is the minimum limit.

  In (a) -2 and (b) -2, the time is shortened or the voltage is lowered to the minimum diameter in order to prevent the ink passing through at high temperatures and set off.

  When the drilling energy variable range between (a) -1 and (a) -2 and the drilling energy variable range between (b) -1 and (b) -2 are compared, (b) -1 and ( b) The range between -2 is narrower because of the higher density and smaller diameter.

  When the drilling energy variable range between (a) -1 and (b) -1 and the drilling energy variable range between (a) -2 and (b) -2 are compared, both have low resolution (a The variable range is wider between) -1 and (a) -2. In addition, the perforation energy variable range becomes the maximum between (a) -1 and (b) -2.

  As described above, since the setting range (variable range) of the drilling energy differs depending on the drilling diameter at the time of low resolution and high resolution, a unique value can be set for each resolution setting value in the sub-scanning direction. Good.

  As the setting range in the drilling energy adjustment means, a unique punching energy value can be set for each resolution setting value in the sub-scanning direction. Therefore, by setting an appropriate range suitable for drilling for each resolution setting value, excessive drilling or punching A defect or the like can be eliminated, and a suitable print image can be obtained for each resolution setting value.

(Example corresponding to claim 3)
Based on the data table of the reference punching energy storage data table means, the punching energy data for each sub-scanning direction resolution calculated based on the above unique ratio value set by the punching energy ratio value means for each sub-scanning direction resolution. Based on the above, the printing rate rank classification at the time of plate making with the thermal head is taken into consideration. For example, the contents of the ranking are defined as a ratio to the total number of heating elements that simultaneously drive the heating resistors of the thermal head. For example, when the number of simultaneously driven heating elements is 2304 corresponding to 2304 dots, when dividing into 16 ranks, the number of heating elements of 2304/16 is set as the ratio of one rank as the ratio of one rank, and it corresponds to the printing rate. The purpose is to heat the heating element at a ratio. When the printing rate is low, the rank is low, that is, the number of heating elements printed at the same time is reduced.

  The purpose of generating heat according to the printing rate rank is to compensate for the common drop, that is, the voltage drop in the common electrode, the thermal head driving harness (electric wire), etc., as the number of simultaneously driven heating elements increases.

  Data at a printing rate of 100% for each resolution is fundamental. The data is for each thermal head temperature, and the data corresponding to the common drop correction rate (correction by the printing rate) is used based on this data. Data is prepared for each print rate rank.

  Two examples of the content of taking into account the printing rate rank classification are given. First, the printing rate is recognized by the microcomputer 20, and energy correction is performed using a data table classified by printing rate rank.

  Second, processing is performed in the thermal head drive circuit 41. This is because the thermal head drive circuit 27: the function of counting the printing rate in the ASIC (application specific integrated circuit) and the energy condition data previously downloaded to the ASIC according to the count (rank) or the energy condition data stored in advance. Use and correct energy.

  In any case, the more the number of heating elements that can be driven simultaneously when making a plate with a thermal head, the more common drops, that is, voltage drops, occur in the common electrode, the thermal head drive harness (electric wire), etc. However, as in this example, when the data in the perforation energy storage data table means by sub-scanning direction resolution is used as a base, and the printing rate rank classification in the plate making with the thermal head is taken into consideration, the claim 1 The certainty of obtaining the effect of the invention can be increased.

(Example corresponding to claim 4)
This example is based on the data table of the reference perforation energy storage data table means, and for each sub-scanning direction resolution calculated based on the unique ratio value set by the per-scanning direction resolution perforation energy ratio value means. Based on the perforation energy data, it has perforation energy setting means for each ink type that can set perforated energy setting values converted and converted according to the type of ink for the thermal stencil printing machine to be used.

  For example, the viscosity of the ink varies depending on the type of ink at each production plant even in the same color. The viscosity of the ink has an influence on the discharge amount from the part melt-pierced on the film in the heat-sensitive stencil master, which means that the density is insufficient due to insufficient ink discharge amount, or vice versa. It will lead to the deterioration of the characteristic set-up.

  Therefore, in order to compensate for this inconvenience, the perforation energy setting value converted and converted based on the data table in the perforation energy storage data table means by sub-scanning direction resolution as a reference can be set.

  Conversion data for each ink type is stored in advance as data in a storage medium of the microcomputer 20 that functions as a perforation energy setting means for each ink type, and signals from sensors and the like provided in the thermal stencil printing apparatus (the ink used) Based on the data table in the sub-scanning direction resolution-specific perforation energy storage data table means, the converted perforation energy set value is set according to the type of ink for the thermal stencil printing machine to be used. The set value may be a constant ratio or the perforation energy ratio may be different for each thermal head temperature.

  As means for obtaining information on the type of ink being used, (1) a sensor or IC tag for notifying ink information is provided in the ink pack part, (2) a dip switch is provided on the printing drum 101, and each ink is set. A method of identifying by a set value can be employed.

  According to this example, the influence of the type of ink can be reduced, and the certainty of obtaining the effect of the invention according to claims 1 and 2 can be increased.

(Example corresponding to claim 5)
Based on the data table of the reference punching energy storage data table means, the punching energy data for each sub-scanning direction resolution calculated based on the above unique ratio value set by the punching energy ratio value means for each sub-scanning direction resolution. And a per-print drum perforation energy setting means that can set a converted perforation energy set value depending on the type of drum for a thermal stencil printing press to be used.

  For example, when the sizes are different, such as an A3 size printing drum or an A4 size printing drum, the sizes of the components such as the plate cylinder are different even if the drums have the same configuration. If the sizes are different, the rigidity of the printing drum will also be different.

The increase in rigidity means that the pressurizing force and printing pressure of the printing drum during printing are substantially increased, and as a result, the ink ejected from the perforated portion of the wound thermal stencil master. This leads to a problem that the amount increases and the print image density increases.
For example, in the relationship between the A3 size printing drum and the A4 size printing drum, the A4 size printing drum has higher rigidity, and therefore, when both of these printing drums are wound with a master having the same perforation diameter, printing is performed. Furthermore, the amount of ink ejected from the master perforation portion of the A4 size printing drum tends to be larger than the amount of ink ejected from the master perforation portion of the A3 size printing drum. In order to eliminate improper image density due to such a tendency, in the setting of punching energy in this example, the larger the target paper size as the type of printing drum, the smaller the punching diameter (the higher the rigidity). The drilling energy set value is set in such a tendency.

  Therefore, according to the type (rigidity) of the print drum, the data of the data table in the sub-scanning direction per-resolution resolution perforation energy storage data table means is converted by the per-print drum perforation energy setting means to set the perforation energy setting value, The thermal head driving circuit 27 is driven.

  Conversion data for each type of printing drum is stored in advance as data in a storage medium of the microcomputer 20 that functions as a perforation energy setting unit for each printing drum, and a signal (used by a sensor or the like provided in the thermal stencil printing apparatus). Based on the data table in the sub-scanning direction resolution-specific perforation energy storage data table means, the converted perforation energy setting value is set according to the type of print drum to be used. The set value may be a constant ratio or the perforation energy ratio may be different for each thermal head temperature.

  As a means for obtaining information about the used printing drum, a method of providing an IC tag or a dip switch on the printing drum 101 and identifying based on the information can be employed.

  According to this example, in addition to the effects of the first to third aspects of the invention, the influence of the type of printing drum can be reduced, and the certainty of obtaining the effects of the invention of the first to third aspects can be increased. Become.

(Example corresponding to claim 6)
This example is provided with ink temperature detecting means for detecting the ink temperature of the ink used in the thermal stencil printing apparatus, and the perforation energy adjusting means for each ink temperature for adjusting to the optimum perforation energy corresponding to the detected ink temperature. Provide.

In order to make up for such characteristics, if the ink temperature is high when the perforated state is constant, the ink itself becomes soft and the amount of ink discharged increases. Conversely, when the ink temperature decreases, the amount of ink discharged decreases. The ink temperature is detected by the ink temperature detection means, and the optimum perforation energy is adjusted according to the detected ink temperature. To illustrate the general tendency of perforation energy adjustment by means of perforation energy adjustment by ink temperature, the perforation diameter is reduced by reducing the perforation energy when the ink temperature is high compared to the perforation energy when the ink temperature is low, Conversely, the perforation energy when the ink temperature is low is adjusted to be higher than the perforation energy when the ink temperature is high, and the perforation diameter is expanded to set the perforation energy that matches the ink temperature during printing. It is.
As a result, the influence of the ink temperature can be reduced, and a perforated state corresponding to the resolution in the sub-scanning direction can be obtained.

Adjustment of the optimum perforation energy corresponding to the ink temperature detected by the ink temperature detection means is performed by the microcomputer 20 functioning as perforation energy adjustment means for each ink temperature.
As the ink temperature detection means, it is desirable to use a thermistor or the like and directly measure the ink reservoir 107 part in the printing drum 101. However, since the temperature of the metal part in the vicinity thereof is substantially equal to the ink temperature, this is measured and used as the ink temperature. It may be used.

(Example corresponding to claim 7)
This example is provided with an ink saving mode setting means capable of reducing the ink consumption and has an ink saving mode for reducing the ink consumption.

  In the ink saving mode, (1) the perforation energy is set low and the perforation state is reduced to reduce the ink discharge amount. Alternatively, (2) the printing pressure at the printing unit is reduced to reduce the ink discharge amount. (3) Use both. Do things like that.

  These ink saving modes are executed by the microcomputer 20, and the ink saving mode is set using an ink saving mode setting means such as an operation panel key, an LCD (liquid crystal display), a touch panel or the like.

  Depending on the degree of density increase in the high-resolution mode, the ink-saving mode can be disabled due to restrictions such as film perforation probability. Alternatively, a warning may be urged on the operation panel or the like, for example, when the ink saving mode is performed, the image is affected.

  In this example, it is possible to reduce the amount of ink consumed even if the resolution in the sub-scanning direction is changed.

(Example corresponding to claim 8)
In this example, the normal mode and the ink saving mode are identified by the ink saving mode setting means, and the original punching energy setting values in the normal mode and the ink saving mode are based on the perforation energy storage data table by resolution in the sub-scanning direction. Can be set.

  As the set value, the energy applied to the thermal head is set within a level range that can be used substantially as the print image quality for each resolution in the sub-scanning direction, and finally the ink consumption is reduced. In this case, the printing pressure in the printing unit may be adjusted at the same time.

For example, in the normal mode other than the ink saving mode, the perforation energy setting value is set at a ratio value of -7% with respect to the base data table, whereas in the ink saving mode, the setting value is -22%. Is set. It is desirable that this ratio value can be set for each resolution in the sub-scanning direction.
In this example, it is possible to reduce the ink consumption while maintaining a certain print image quality, and the ink reduction amount can be 10% or more.

(Example corresponding to claim 9)
When a heat-sensitive stencil master provided with at least one coating layer of a thermoplastic resin film and a porous resin film is used, a perforation energy data table suitable for this master is used.

  As the heat-sensitive stencil master 61 that can be used in the heat-sensitive stencil printing apparatus, (1) a heat-sensitive stencil master provided with at least one coating layer of a thermoplastic resin film and a porous resin film is used. Alternatively, (2) there is one in which a thermoplastic resin film is bonded onto Japanese paper as a porous support, and others.

  When a thermosensitive stencil master having at least one coating layer of a thermoplastic resin film and a porous resin film is selected and a perforation energy data table suitable for this master is used, the perforation variable range is A good drilling state is obtained by defining a variable range of applied energy corresponding to the widened drillable range. It is possible to reduce the influence even when there is a porous support (Japanese paper) in the lower part of the coating layer of the porous resin film, and the smoothness of the thermoplastic resin film surface becomes good, This is because the perforation probability is considerably improved in the same perforation state, and a more suitable print image can be obtained by setting suitable conditions.

It is the figure explaining schematic structure of the thermal stencil printing apparatus. It is a control block diagram of a thermal stencil printing apparatus. As a comparative example, it is the figure which showed the characteristic data of the drilling energy with respect to the thermal head temperature according to resolution in the graph. It is the figure which showed the characteristic data of the drilling energy with respect to the thermal head temperature according to resolution in the graph. It is a figure explaining the variable range of drilling energy according to resolution. FIG. 5 is a diagram schematically showing a punching state for a heat-sensitive stencil master, where (a) -1 is low resolution in the sub-scanning direction and the punching diameter is large, and (a) -2 is low in the sub-scanning direction. When resolution is the smallest perforation diameter, (b) -1 is high resolution in the sub-scanning direction and the perforation diameter is large, and (b) -2 is high resolution in the sub-scanning direction. This is the case where the pore diameter is the minimum limit.

Explanation of symbols

10 Sub-scanning direction resolution setting key 11 (as sub-scanning direction resolution setting means) LED (light emitting diode)
20 Microcomputer 30 Thermal head 40 Master feed motor 50 (as drive means) Main unit cabinet 62 Printing paper 92 Platen roller L1, L2, L10, L20 Characteristic line

Claims (9)

In a state where a thermal stencil master having at least a thermoplastic resin film is pressed by a platen roller with respect to a thermal head having a large number of heat generating portions arranged in the main scanning direction, it is orthogonal to the main scanning direction. While moving the heat-sensitive stencil master in the sub-scanning direction by the master conveying means, the heat generating portion is heated according to the image signal, and the thermoplastic resin film is position-selectively melted and perforated according to the image signal. A perforation pattern is obtained, and this heat-sensitive stencil master is wound around the outer peripheral surface of the printing drum, ink is supplied from the inner peripheral side of the printing drum, and the ink exuded through the perforation pattern responds to the image signal. A thermal stencil printing apparatus for forming a printed ink image on a printing paper,
Driving means for driving the master conveying means so as to move the thermosensitive stencil master with a predetermined feed pitch, sub-scanning direction resolution setting means for setting the resolution in the sub-scanning direction, and sub-scanning direction resolution setting means On the basis of this signal, a drive control means for controlling the drive means so as to change the feed pitch corresponding to the set resolution in the sub-scanning direction, and the thermal head in accordance with the signal from the sub-scanning direction resolution setting means In the heat sensitive stencil printing apparatus having the perforation energy adjusting means for adjusting the perforation energy supplied to the individual heat generating parts to a predetermined energy,
Reference drilling energy storage in which drilling energy data is stored for each thermal head temperature as reference data for a predetermined resolution in the sub-scanning direction is provided as a drilling energy data table in the punching energy adjusting means. Data table means;
Based on the data table of the reference punching energy storage data table means, a ratio value for calculating the punching energy corresponding to the resolution setting value in the sub-scanning direction based on the data table, the punching energy adjusting means Within the set range, a perforation energy ratio value means for each sub-scanning direction resolution is provided for each of the resolution setting values in the sub-scanning direction and for each thermal head temperature with respect to the perforation energy data. A heat-sensitive stencil printing apparatus. In the heat-sensitive stencil printing apparatus according to claim 1,
A thermal stencil printing apparatus, comprising a per-scanning direction per-resolution resolution perforation energy setting range setting means capable of setting a unique value for each resolution setting value in the sub-scanning direction as a setting range in the perforation energy adjusting means. In the heat-sensitive stencil printing apparatus according to claim 1 or 2,
Based on the data table of the reference punching energy storage data table means, the punching energy data for each sub-scanning direction resolution calculated based on the above unique ratio value set by the punching energy ratio value means for each sub-scanning direction resolution. A heat-sensitive stencil printing apparatus characterized in that the energy is corrected by taking into account the printing rate rank classification at the time of plate making with a thermal head. In the heat-sensitive stencil printing apparatus according to any one of claims 1 to 3,
Based on the data table of the reference punching energy storage data table means, the punching energy data for each sub-scanning direction resolution calculated based on the above unique ratio value set by the punching energy ratio value means for each sub-scanning direction resolution. A thermal stencil printing apparatus characterized by providing a perforation energy setting means for each ink type that can set a converted perforation energy set value according to the type of ink for a thermal stencil printing machine to be used. In the heat-sensitive stencil printing apparatus according to any one of claims 1 to 4,
Based on the data table of the reference punching energy storage data table means, the punching energy data for each sub-scanning direction resolution calculated based on the above unique ratio value set by the punching energy ratio value means for each sub-scanning direction resolution. A thermal stencil printing apparatus comprising: a perforation energy setting means for each printing drum which can set a converted perforation energy set value according to the type of drum for a thermal stencil printing machine to be used. In the heat-sensitive stencil printing apparatus according to any one of claims 1 to 5,
Ink temperature detecting means for detecting the ink temperature of the ink used in the above thermal stencil printing apparatus was provided, and had an ink temperature perforating energy adjusting means for adjusting to an optimum perforating energy corresponding to the detected ink temperature. A heat-sensitive stencil printing apparatus. In the heat-sensitive stencil printing device according to any one of claims 1 to 6,
A heat-sensitive stencil printing apparatus comprising ink-saving mode setting means capable of reducing ink consumption. In the heat-sensitive stencil printing apparatus according to claim 7,
A heat-sensitive stencil printing apparatus characterized in that the ink-saving mode setting means can identify the normal mode and the ink-saving mode, and can set unique perforation energy setting values in the normal mode and the ink-saving mode. In the heat-sensitive stencil printing apparatus according to any one of claims 1 to 8,
When a thermosensitive stencil master provided with at least one coating layer of a thermoplastic resin film and a porous resin film is used, a perforation energy data table suitable for this master is used. apparatus.

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