JP4236968B2 - Energy saving stencil printing apparatus and energy saving printing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an energy saving stencil printing apparatus and an energy saving printing method excellent in energy saving.
[0002]
[Prior art]
Since the absolute energy consumption of the stencil printing apparatus is small, there has been no particular awareness of energy saving. However, the present applicant has proposed a stencil printing apparatus that performs printing by adjusting the printing density by changing the pressing force of a press roller that presses the printing paper against the plate cylinder within a predetermined range (see Patent Document 1). It has been known that the pressing force of the roller and the power consumption of the motor that drives the plate cylinder are linked.
[0003]
[Patent Document 1]
Japanese Patent No. 2593623
[0004]
[Problems to be solved by the invention]
In recent years, there has been a demand for a stencil printing apparatus excellent in energy saving from the viewpoint of environmental performance and low running cost. Most of the energy consumption in the stencil printing apparatus is the power consumption of the motor that rotates the plate cylinder.
[0005]
In conventional stencil printing machines, the platemaking conditions (printing mode) and printing conditions (pressing force) are set on the premise that special paper or high-quality paper (hereinafter referred to as high-quality paper) is used. When used, the print quality may be deteriorated, for example, the print density is changed.
[0006]
In such a case, it is possible to adjust the printing density to a desired printing density by adjusting the pressing force. However, since the conventional stencil printing apparatus is set on the premise of printing on fine paper, The perforation diameter when making the plate was relatively small. Accordingly, since the pressing force is set to be relatively high and the adjustment range is narrow, the power consumption of the motor is large, and the fluctuation of the power consumption accompanying the adjustment of the pressing force is also minute.
[0007]
The present invention has been made in view of the above, and an object of the present invention is to provide an energy-saving stencil printing apparatus and an energy-saving printing method excellent in energy saving even when any printing paper is used.
[0008]
[Means for Solving the Problems]
A feature of the stencil printing apparatus according to the present invention is a stencil printing apparatus that punches a stencil sheet with a thermal head to make a plate, presses the printing sheet against a plate cylinder on which the stencil sheet is made, and performs printing. A setting means for setting the energy saving printing and the degree of energy saving, an energy saving plate making means for executing energy saving plate making for the set energy saving printing, and a printing pressure adjusting unit for controlling the set pressing force, and energy saving printing and energy saving. Is set by the setting unit, the plate making unit executes the energy saving plate making corresponding to the set energy saving printing by the energy saving plate making unit, and the printing unit controls the pressing force by the printing pressure adjusting unit. And printing.
[0009]
The printing method according to the present invention is characterized by a printing method in which a stencil sheet is punched by a thermal head to make a plate, and the printing sheet is pressed against a plate cylinder on which the stencil sheet is made, and is printed. The energy saving printing and energy saving degree are set from the setting means, the plate making unit executes the energy saving plate making corresponding to the set energy saving printing, and the printing unit controls the pressing force by the printing pressure adjusting unit. And printing.
[0010]
In the stencil printing apparatus and printing method having such characteristics, when the energy saving printing and the degree of energy saving are set by the setting means, the energy saving plate making means performs energy saving plate making on the stencil paper, and the printing pressure adjusting unit applies the pressing force. By performing the energy-saving plate making process and the energy-saving printing process of adjusting and printing together, printing with excellent energy saving can be performed.
[0011]
The energy-saving plate making means includes at least the thermal head and a thermal head drive control unit that controls the thermal head, and the thermal shrinkable film temperature of the stencil sheet sufficiently exceeds the melting point temperature. The head drive control unit controls the applied power and application time applied to the thermal head to make a plate.
[0012]
In the energy-saving plate making means having such characteristics, since the temperature of the heat-shrinkable film of the stencil sheet sufficiently exceeds the melting point temperature, the stencil sheet is made with a larger perforation diameter than that of standard printing. The pressure can be set low, and printing with excellent energy saving can be performed.
[0013]
In addition, the printing pressure adjustment unit has a function of controlling a pressing force for pressing the printing paper against the plate cylinder on which the stencil sheet is made, and the degree of energy saving set by the setting unit. The pressing force is controlled accordingly.
[0014]
Furthermore, the printing pressure adjusting unit has a function of controlling a pressing force that presses the printing paper against the plate cylinder on which the stencil sheet is made, and the printing paper set by the setting unit. The pressing force is controlled according to the paper type and the degree of energy saving.
[0015]
The printing pressure adjustment unit having such a feature has a function of controlling the pressing force for pressing the printing paper against the plate cylinder on which the stencil sheet is fixed, and therefore the pressing force corresponding to the set degree of energy saving is printed. Printing can be performed by controlling the pressing force with the pressure adjusting unit. Alternatively, printing can be performed by controlling the pressing force in accordance with the set paper type and the degree of energy saving. Therefore, printing is performed by controlling the pressing force to the optimum pressing force for the printing paper used for printing by the printing pressure adjusting unit, so that power consumption of the motor that drives the plate cylinder is not wasted, and printing with excellent energy saving is achieved. it can.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The first and second embodiments of the present invention will be described in detail below with reference to FIGS. Throughout the drawings, the same or equivalent parts and components are denoted by the same or equivalent reference numerals, and the description thereof is omitted or simplified. First, the first embodiment will be described.
[0017]
[Configuration of stencil printing machine]
As shown in FIG. 1, the stencil printing apparatus 100 includes a control unit 9, an operation panel 8, a reading unit 1, a plate making unit 2, a plate receiving unit 3, a plate discharging unit 4, a paper feeding unit 5, a paper discharging unit 6, and a printing unit. 7, a printing pressure adjustment unit 72, a thermal head drive control unit 73, and an external interface unit 74 are provided.
[0018]
The control unit 9 includes a processing device (CPU), RAM, ROM, storage means (for example, a hard disk) (not shown), and the processing device reads programs and data stored in the ROM and storage means to the RAM and processes them. The entire printing apparatus is controlled based on the processing result.
[0019]
The external interface unit 74 has a function for connecting the stencil printing apparatus 100 to another apparatus via a network or the like.
[0020]
The operation panel 8 is disposed at the top of the stencil printing apparatus 100 in order to realize an interface with the user. As illustrated in FIG. 4, the user sets the original type, scaling, print mode, paper size, etc. LCD touch panel 85 for displaying information and the like, numeric keypad 81 for setting the number of copies to be printed, START key 82 for instructing the start of plate making / printing, STOP key 83 for instructing stop of plate making / printing, the set number of prints, etc. A display unit 84 is provided.
[0021]
Further, the operation panel 8 includes print density setting keys 87a and 87b for setting the print density, a print density display portion 86 for displaying the set print density, and print speed setting keys 89a and 89b for setting the print speed. A printing speed display unit 88 for displaying a printing speed, a trial printing key 90 for instructing a trial printing, and the like are provided.
[0022]
In the case of plate making / printing, when the plate making / printing button displayed in the upper right corner of the liquid crystal touch panel 85 is operated (touched), “plate making” and “print” are sequentially set. For example, when “plate making” is set, a setting screen illustrated in FIG. 4 is displayed on the liquid crystal touch panel 85, and a desired condition is set by operating various selection buttons such as document type, scaling, print mode, and paper size. When the START key 82 is operated, the plate making is started. When the plate making is completed, “printable” is displayed on the display button displayed in the upper left corner of the liquid crystal touch panel 85. The plate making / printing button is operated to set “print”, and a setting screen is displayed (not shown) on the liquid crystal touch panel 85. If desired conditions are set as necessary and the START key 82 is operated, the plate making is started.
[0023]
The print mode can be set to “standard”, “ink saving”, and “energy saving”. The standard printing mode means the same printing (standard printing) as a conventional stencil printing machine, the ink-saving printing mode means printing with low ink consumption, and the energy-saving (hereinafter referred to as energy saving) printing mode means printing with low energy consumption. To do.
[0024]
For example, when the energy saving printing mode is set, the energy saving setting screen illustrated in FIG. 5 is displayed on the liquid crystal touch panel 85. When the setting is “high”, the print density becomes lighter than “standard”, but the degree of energy saving.
When (Effect) is set high and “Low” is set, the energy saving effect is reduced, but the print density is set to the same as “Standard”. “Cancel” is a button for canceling the energy saving printing mode.
[0025]
More specifically, the energy saving effect “High” is set to a lower setting value compared to “Low”, and the energy saving effect “Low” is set to “High”. It is controlled to a set value between “standard” and stored in advance in the ROM or storage unit of the control unit 9, and the printing pressure control unit 72 refers to the ROM or storage unit according to the setting of “high” or “low”. Then, the pressing force is controlled to a set value corresponding to the setting of “high” or “low”. Note that the print density is displayed on the print density display unit 86 in accordance with the set “high” or “low”, but the setting can be changed to a print density desired by the user. In this case, the print density can be changed by the print density setting keys 87a and 87b. However, since the pressing force changes according to the printing density, the setting of the pressing force corresponding to the set “high” or “low” also changes. .
[0026]
When the plate making operation is completed, “can make plate” displayed in the upper left corner of the liquid crystal touch panel 85 is switched to “can be printed”, and a print setting screen (not shown) is displayed on the liquid crystal touch panel 85. The user sets print conditions according to the print setting screen, and instructs the start of printing using the START key 82.
[0027]
When the printing start is instructed, the printing pressure adjustment unit 72 controls the pressing force of the press roller 140 according to the set value stored in the RAM of the control unit 9, and the printing unit performs printing.
[0028]
Also, when performing the printing and printing at a certain time, or when performing multicolor printing by sequentially replacing the plurality of plate cylinders 26 around which the stencil sheet 18 is wound, a plurality of methods are used to maintain the same print quality. It is necessary to print under printing conditions (pressing force) that match the plate making conditions (printing mode) of the stencil sheet 18 wound around the plate cylinder 26. Therefore, a storage means 71 is provided in the plate cylinder 26 so that the printing mode of the stencil sheet 18 is stored when the stencil sheet 18 is set by the plate setting unit 3.
[0029]
Therefore, when the plate cylinder 26 is mounted on the stencil printing apparatus 100, the control unit 9 refers to the printing mode stored in the storage means 71 of the mounted plate cylinder 26 and stores it in the RAM of the control unit 9. Displayed on the liquid crystal touch panel 85 or the like. Further, the control unit 9 stores the pressing force corresponding to the printing mode in the RAM with reference to the set value stored in advance in the ROM or the storage unit, and converts it into the printing density display unit 86 to display it. In this case, the user can change the print density from the print density setting keys 87a, 87b and the like, and when the print density is changed, the control unit 9 updates the set value stored in the RAM and displays it on the liquid crystal touch panel 85. The displayed “high” or “low” energy saving effect is also updated. When the start of printing is instructed by the START key 82, the printing pressure adjustment unit 72 controls the pressing force to the set value stored in the RAM and performs printing.
[0030]
As shown in FIG. 2, the reading unit 1 includes a document setting table 10 on which a document to be printed is placed, reflection-type document sensors 11 and 12 that detect the presence of documents on the document setting table 10, and a document setting table. A document conveying roll pair 13, 14 for conveying ten originals, a stepping motor 15 for rotationally driving the document conveying roll pair 13, 14, and an image of the original conveyed by the original conveying roll pair 13, 14 are optically read. A contact-type image sensor 16 that converts the signal into an electric signal, a document discharge tray 17 on which a document discharged from the document set table 10 is placed. The document placed on the document setting table 10 is transported by a pair of document transport rollers 13 and 14 and the image sensor 16 reads an image of the transported document.
[0031]
The plate making unit 2 includes a base paper storage unit 19 that stores the rolled long stencil sheet 18, a thermal head 20 that is disposed downstream of the base paper storage unit 19, and a platen roll that is disposed at a position facing the thermal head 20. 21, a base paper feed roll pair 22 disposed downstream of the transport of the platen roll 21 and the thermal head 20, a light pulse motor 23 that rotationally drives the platen roll 21 and the base paper feed roll pair 22, and a downstream of the transport of the base paper feed roll pair 22. A base paper cutter 24 and the like. The long stencil sheet 18 is conveyed by the rotation of the platen roll 21 and the base paper feed roll pair 22, and the thermal head 20 is controlled by the thermal head drive control unit 73 based on the image data read by the image sensor 16. The base paper 18 is subjected to thermal perforation to make a plate, and the stencil paper 18 thus made is cut into a predetermined length by a base paper cutter 24.
[0032]
The plate receiving section 3 is provided on the outer peripheral surface of the plate cylinder 26, and detects the stencil sheet 27 on the outer peripheral surface of the plate cylinder 26 by detecting a base paper clamp section 27 that clamps the tip of the stencil sheet 18 and a detection piece 28 a of the plate cylinder 26. And a base paper confirmation sensor 28 for detecting whether or not 18 is attached.
[0033]
The printing unit 7 is composed of an ink-permeable member having a perforated structure at the outer peripheral portion, and detects a plate cylinder 26 that rotates in the direction of arrow A in FIG. 2 and a detection piece 29 of the plate cylinder 26 by the driving force of the drum drive motor 25. Thus, a reference position detection sensor 30 for detecting the reference position of the plate cylinder 26, a rotary encoder 31 for detecting the rotation of the drum drive motor 25, and the like are provided. The rotational position of the plate cylinder 26 can be detected by detecting the output pulse of the rotary encoder 31 based on the detection output of the reference position detection sensor 30.
[0034]
The printing unit 7 includes a squeegee roll 32 disposed inside the plate cylinder 26, a doctor roll 33 disposed in proximity to the squeegee roll 32, and an outer peripheral space surrounded by the squeegee roll 32 and the doctor roll 33. Ink 34 is stored. As the ink 34 adhering to the outer periphery of the rotating squeegee roll 32 passes through the gap with the doctor roll 33, only the ink 34 having a predetermined film thickness is attached to the squeegee roll 32. 26 is supplied to the inner peripheral surface.
[0035]
Further, the press roller 140 that presses the printing paper 37 against the plate cylinder 26 and the press roller 140 are driven by the printing pressure adjusting unit 72 in synchronization with the rotation of the plate cylinder 26.
[0036]
Then, the front end of the stencil sheet 18 conveyed from the plate making unit 2 is clamped by the stencil sheet clamping unit 27, and the plate cylinder 26 is rotated in this clamped state so that the stencil sheet 18 is deposited on the outer peripheral surface of the plate cylinder 26, The printing paper 37 conveyed from the paper supply unit 5 in synchronization with the rotation of the plate cylinder 26 is pressed against the stencil sheet 18 which is attached to the plate cylinder 26 by the press roller 140, whereby the ink 34 is discharged from the perforations of the stencil sheet 18. The image of the original is printed on the printing paper 37.
[0037]
The paper supply unit 5 includes a paper supply table 38 on which the print paper 37 is placed, and primary paper supply rolls 39 and 40 that convey only the uppermost print paper 37 from the paper supply table 38. The printing paper 37 conveyed by 40 is conveyed between the plate feeding cylinder 26 and the press roller 140 in synchronization with the rotation of the printing drum 26, and between the secondary paper feeding roll pair 41 and the secondary paper feeding roll pair 41. A paper feed sensor 42 for detecting whether or not the paper has been conveyed. The rotation of the drum drive motor 25 is selectively transmitted to the primary paper feed rolls 39 and 40 via the paper feed clutch 43.
[0038]
The paper discharge unit 6 includes a paper separation claw 44 that separates the printed printing paper 37 from the plate cylinder 26, a conveyance path 45 that conveys the printing paper 37 separated from the plate cylinder 26 by the paper separation claw 44, and a conveyance path And a paper discharge tray 46 on which the printing paper 37 discharged from 45 is placed. The paper discharge stand 46 is provided with side fences 59 and 60 and an end fence 61.
[0039]
The plate discharge unit 4 is conveyed by a plate discharge conveyance roll pair 47 that conveys the stencil sheet 18 attached to the plate cylinder 26 while peeling, a plate discharge motor 48 that rotates the plate discharge conveyance roll pair 47, and a plate discharge conveyance roll pair 47. A stencil box 49 for storing the stencil sheet 18 coming in, a stencil sensor 50 for detecting whether or not the stencil sheet 18 conveyed by the stencil conveying roll pair 47 has been conveyed to the stencil box 49, and the like.
[0040]
FIG. 3 shows a detailed configuration example of the printing pressure adjustment unit 72.
[0041]
As shown in FIG. 3, a cam 141 rotating integrally with the plate cylinder 26 is attached to the central shaft 120c of the plate cylinder 26, and a cam follower lever 142 pivotally supported at one end by a shaft 142a is attached to the cam 141. Is engaged. The cam follower lever 142 is biased downward in FIG. 3 by a spring (not shown), and the other end is pivotally connected to the lever element 143 by a shaft 142b.
[0042]
The lever element 143 includes a first lever element 144 directly connected to the cam follower lever 142 by a shaft 142b, and a second lever element 145 provided with a pulse motor 150 and a speed reduction mechanism 151.
[0043]
The first lever element 144 is provided with a U-shaped sliding groove 144b in which the second lever element 145 slides. The first lever element 144 and the second lever element 144 are guided by the sliding groove 144b. The lever elements 145 are mutually extendable in the longitudinal direction of each lever element. A long hole 146a is formed in the second lever element 145, and an engagement terminal 146 attached to the first lever element 144 is engaged with the long hole 146a, whereby the first lever element 144, The second lever element 145 has a maximum amount of expansion and contraction.
[0044]
The first lever element 144 is provided with a long hole 144a through which the central shaft 120c is released so that the entire lever element 143 can be moved up and down by the rotation of the cam 141.
[0045]
A support plate portion 147 is bent at the lower end portion of the second lever element 145, and the support plate portion 147 is provided with a pulse motor 150 and a speed reduction mechanism 151 that decelerates the output of the pulse motor 150. .
[0046]
A gear 150a is attached to the output shaft of the pulse motor 150, and a large-diameter gear 152 constituting a reduction mechanism 151 is engaged with the gear 150a together with the gear 150a. A through hole 152a into which a threaded control rod 153 is screwed is provided at the center of the large diameter gear 152, and the rotation of the pulse motor 150 is decelerated by the meshing of the gear 150a and the large diameter gear 152. The movement of the control rod 153 in the direction of the central axis is converted by screw engagement.
[0047]
One end of the tension coil spring 154 is locked to one end of the control rod 153, and the tension coil spring 154 is locked to the pin 155 fixed to the first lever element 144 at the other end, and the second lever element 145 is biased upward in FIG. 3 with respect to the first lever element 144.
[0048]
The second lever element 145 has a long hole 155a through which the pin 155 is inserted.
[0049]
One end of a swing lever 156 is connected to the second lever element 145 by a shaft 156b, and the swing lever 156 is pivotally supported by a shaft 156a from a machine frame (not shown) at an intermediate portion. One end of a connecting plate 157 and a connecting lever 193 is coaxially fixed to the shaft 156a, and a bracket 159 that rotatably supports the press roller 140 by a rotating shaft 159a is attached to the connecting plate 157 by a connecting member 158.
[0050]
A damper 196 that performs a vibration damping action is fixed to a machine frame (not shown) by a screw 197, and an intermediate portion of the hook lever 192 and the other end of the connecting lever 193 are respectively rotated by a shaft 191a on the plunger 191 of the damper 196. It is mounted movably.
[0051]
An engaging portion 192a bent in an L shape is provided at the lower end portion of the hook lever 192, and a protrusion 156c that is detachably engaged with the engaging portion 192a is provided at the end portion of the swing lever 156. ing. As a result, the swing lever 156 and the connecting lever 193 are selectively driven and connected with respect to the rotation of the swing lever 156 in the counterclockwise direction in FIG.
[0052]
Note that the maximum amount of rotation of the connecting lever 193 in the clockwise direction in FIG. 3, in other words, the maximum separation position of the press roller 140 is set to be adjustable by an adjusting screw 171 screwed to the support member 172.
[0053]
The hook lever 192 is biased by a spring (not shown) in the clockwise direction in FIG. 3, that is, in a direction away from the engagement with the swing lever 156.
[0054]
A plunger lever 194 is pivotally attached to a machine frame (not shown) by a pivot 194a. The plunger lever 194 is selectively rotated in the clockwise direction in FIG. 192 is rotated in the counterclockwise direction in FIG. 3, that is, in the direction of engagement with the swing lever 156.
[0055]
As a result, the swing lever 156 and the connecting lever 193 are drivingly connected by the ON operation of the solenoid 198.
[0056]
The monitoring sensor 195 monitors the position of the press roller 140.
[0057]
When the cam 141 is in the rotational position shown in FIG. 3, the lever element 143 is in the lower position as a whole, and the press roller 140 is in a separated position away from the plate cylinder 26, as shown in FIG. is there.
[0058]
When the central shaft 120c is rotated 180 degrees counterclockwise in FIG. 3 by driving the drum drive motor 25 from this state, the cam 141 is also rotated 180 degrees, and the lever element 143 is moved upward as a whole. The swing lever 156 is rotated counterclockwise in FIG. 3 about the shaft 156a.
[0059]
At this time, when the solenoid 198 is pulled and the engaging portion 192 a of the hook lever 192 and the protrusion 156 c of the swing lever 156 are engaged, the swing of the swing lever 156 is connected via the hook lever 192. This is transmitted to the lever 193, whereby the shaft 156a is rotated in the counterclockwise direction in FIG. 3, and the press roller 140 moves to the direction in which the outer peripheral surface of the plate cylinder 26 is pressed, that is, to the press acting position. The printed paper 37 is pressed against the outer peripheral surface of the plate cylinder 26 to perform stencil printing.
[0060]
At this time, the movement of the press roller 140 to the press acting position is caused by the first lever element 144 being pulled up and this movement being transmitted to the second lever element 145 while applying a tensile force to the tension coil spring 154, and swinging. The operation is performed by the lever 156 rotating about the shaft 156a in the counterclockwise direction in FIG. The press roller 140 is pressed against the outer peripheral surface of the plate cylinder 26 with the printing paper 37 interposed therebetween, and the counterclockwise rotation in FIG. 3 about the shaft 156a of the swing lever 156 is limited. Still further, when the first lever element 144 is pulled up, the first lever element 144 is displaced with respect to the second lever element 145, and the tension coil spring 154 expands. As a result, the press roller 140 is pressed against the outer peripheral surface of the plate cylinder 26 with the printing paper 37 sandwiched between them by the spring force generated by the extension of the tension coil spring 154, and the pressing force is determined by this spring force.
[0061]
In adjusting the pressing force, the pulse motor 150 is driven to rotate the large-diameter gear 152 to change the longitudinal position of the control rod 153 in the second lever element 145. Thereby, the attachment length of the tension coil spring 154 changes, and the tension force of the tension coil spring 154 changes accordingly.
[0062]
Due to the change in the tensile force of the tension coil spring 154, the pressing force for pressing the press roller 140 against the outer peripheral surface of the plate cylinder 26 under the action as described above changes.
[0063]
As shown in FIG. 8, the thermal head drive control unit 73 uses the image data read by the reading unit 1 and binarized, the clock signal (CLK), etc. as input signals, the punching data (DATA), and the punching clock (CLK). The latch head (/ LAT) and strobe signal (/ STB) are output to control and drive the thermal head 20. The punching data (DATA) input to the thermal head 20 is input via a serial input shift register (not shown) provided in the thermal head 20, is converted into parallel data, and is generated at a predetermined timing (a latch signal). / LAT) is held by a latch portion (not shown) provided in the thermal head 20. The thermal head 20 generates heat at a desired timing by the logical product of the input strobe signal (/ STB) and the data held in the latch unit.
[0064]
The thermal head drive control unit 73 receives a print mode signal from the control unit 9 and outputs a voltage control signal for controlling a voltage applied to the thermal head 20 to the power supply unit. The power supply unit receives the voltage control signal and receives the print mode signal. An applied voltage Vh corresponding to the signal is applied to the thermal head 20.
[0065]
In such a configuration of the stencil printing apparatus 100, the user sets the energy saving printing mode from the liquid crystal touch panel 85, sets “high” or “low” on the setting screen shown in FIG. 5, and presses the START key 82. When an instruction to start plate making is given, plate making corresponding to the energy saving printing mode (hereinafter abbreviated as energy saving plate making) is started. Note that “high” and “low” mean that the energy saving effect (degree) is “set high” and “set low”.
[0066]
Based on the energy saving printing mode signal from the control unit 9, the thermal head drive control unit 73 performs standard printing of the energy applied to the thermal head 20 so that the temperature of the heat-shrinkable film of the stencil sheet 18 sufficiently exceeds its melting point temperature. Compared to the mode (hereinafter abbreviated as standard printing), the value is controlled to be large. Here, the power is given by the product of the voltage Vh and the current applied to the thermal head 20, and the energy is given by the product of the power and the application time (strobe signal). Therefore, when the power is increased, the applied voltage Vh can be increased, and when the energy is increased, the applied voltage can be increased.
[0067]
As a result, the stencil sheet 18 is made with a larger perforation diameter than the standard printing. Since the perforation diameter and the ink transfer amount are directly proportional to each other, when a printed matter having the same print density as that of standard printing is desired, the printing pressure adjusting unit 72 sets the pressing force of the press roller 140 to the perforation diameter when the energy saving effect is set to “low”. Control to a low pressing force commensurate with When energy saving is desired even if the printing density is reduced, the printing pressure adjustment unit 72 controls the pressing force of the press roller 140 to a lower pressing force corresponding to the printing density. To do.
[0068]
Therefore, the load of the drum drive motor 25 that drives the plate cylinder 26 is reduced according to the decrease in the pressing force, and the power consumption is reduced.
[0069]
Thus, by making a plate with a large perforation diameter, the load of the drum drive motor 26 that drives the plate cylinder 26 is reduced, and power consumption is reduced. FIG. 6 shows relative values of the energy saving printing mode, the pressing force and the power consumption in the energy saving effect “high” and “low” when the standard printing is set to 1.
[0070]
The printing quality in the stencil printing apparatus is closely related to the piercing diameter of the stencil paper 18 and the pressing force. Even if the pressing force is reduced simply by increasing the piercing diameter, the printing quality is deteriorated or the screen is disturbed. It is preferable that the optimum setting values of the drilling diameter and the pressing force are obtained in advance by experiments.
[0071]
As described above, in the first embodiment, when the energy saving printing mode and the energy saving degree are set by the setting means, the energy saving plate making means performs energy saving plate making with a large perforation diameter, and the printing pressure adjusting unit 72 is the pressing force. Since printing is performed by controlling the pressing force according to the set energy saving degree, energy saving printing with low power consumption can be performed.
[0072]
Further, a storage means 71 is provided in the plate cylinder 26 to store the printing mode and the energy saving level of the stencil sheet 18 and display them on the operation panel 8 by referring to the printing mode and the energy saving level stored at the time of printing. The user can recognize the print mode and the energy saving level, and the printing pressure is controlled by the printing pressure adjusting unit 72 to the pressing force corresponding to the set energy saving level, so that power consumption can be reduced and efficiency can be reduced. Good printing work.
[0073]
FIG. 7 is a diagram illustrating a setting screen displayed on the liquid crystal touch panel 85 of the stencil printing apparatus 100 according to the second embodiment of the present invention. The feature of the second embodiment is that, in the setting of the energy saving printing mode shown in FIG. 5, the paper type and the energy saving degree of the printing paper 37 are set instead of the method of setting the degree of energy saving (high and low). Thus, the printing pressure adjustment unit 72 controls printing by controlling the pressing force to a pressing force corresponding to the set paper type and the degree of energy saving. The rest is the same as in the first embodiment, and the relationship between the energy saving degree of the paper type and the pressing force is stored in advance in the ROM or the storage device of the control unit 9.
[0074]
The print density of the printed matter in the stencil printing apparatus has a dot gain that differs depending on the paper type of the printing paper 37. For example, the paper gain is about 20% higher in dot gain than the high-quality paper. Therefore, if the density is the same, the pressing force when using the additional paper can be reduced as compared with the case where the fine paper is used.
[0075]
In addition, since the high-quality paper has a relatively small dot gain and the print density is lowered (it tends to become thin) more than the reduction of the pressing force, the pressing force reduction range is set small.
[0076]
With this configuration, for example, when the paper type of the printing paper 37 is set to high-quality paper, a setting screen shown in FIG. 7A is displayed on the liquid crystal touch panel 85. The energy saving degree “low” is set when a printed matter having the same print density as that of standard printing is desired.
[0077]
As in the first embodiment, since the energy-saving plate making has a large perforation diameter, the pressing force suitable for the high-quality paper can be set lower than in the standard printing, and the drum driving motor 25 for driving the plate cylinder 26 is used. Load is low, and power consumption is reduced.
[0078]
The energy saving degree “high” is set when it is desired that the energy saving effect is high even if the printing density is further reduced. Accordingly, the pressing force can be set lower than the energy saving degree “low”, and the power consumption is further reduced.
[0079]
When the paper type of the printing paper 37 is set to renewal, a setting screen shown in FIG. 7B is displayed on the liquid crystal touch panel 85. When the energy saving degree is “low”, the pressing force can be set to a lower pressing force than the case of the energy saving degree “low” of the high-quality paper because of the dot gain, and the drum driving motor that drives the plate cylinder 26. The load of 25 is further reduced, and the power consumption is further reduced.
[0080]
The energy saving degree “high” is set when it is desired that the energy saving effect is high even if the printing density is further reduced. Accordingly, the pressing force can be set lower than the energy saving degree “low”, and the power consumption is further reduced.
[0081]
The pressing force is set corresponding to the paper type and the degree of energy saving, and is stored in advance in the RM of the control unit 9 or the storage device. The cancel button is a button for canceling the setting of the corresponding paper type.
[0082]
As described above, in the second embodiment, when the energy saving printing mode, the paper type, and the energy saving degree are set from the setting means, the energy saving plate making means performs the energy saving plate making with a large perforation diameter on the stencil paper 18 and applies the pressing force to the printing pressure. The adjustment unit 72 performs printing by controlling the pressing force suitable for the set paper type and the degree of energy saving of the printing paper 37. Since the stencil sheet 18 is made with energy saving with a large perforation diameter, even if printing is performed with a lower pressing force compared to the standard printing, the same density as the standard printing is obtained, and the power consumption can be reduced. Further, since the pressing force is set according to the paper type and the energy saving degree of the printing paper 37, the power consumption can be reduced according to the paper type and the energy saving degree.
[0083]
In the first and second embodiments, the energy saving printing mode may be automatically set when the stencil printing apparatus 100 is turned on. With this configuration, the energy saving printing mode is set and energy saving printing can be performed without the user being particularly conscious.
[0084]
【The invention's effect】
As described above, according to the present invention, when the energy saving printing mode and the energy saving degree are set, the energy saving plate-making means makes a plate with a larger punch diameter on the stencil paper 18 as compared with the standard printing. Even if printing is performed with a reduced pressing force, a printing density comparable to that of standard printing can be obtained. If the printing density is set lower, the pressing force can be further reduced. Therefore, the power consumption of the drum drive motor 25 that rotationally drives the plate cylinder 26 can be reduced.
[0085]
Furthermore, according to the present invention, when the paper type and the energy saving degree of the printing paper 37 are set, printing is performed by controlling the printing pressure adjustment unit 72 to the optimum pressing force according to the paper type and the energy saving degree. Can save energy.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a stencil printing apparatus according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a configuration of a plate making / printing processing unit of the stencil printing apparatus shown in FIG.
3 is a diagram showing a configuration of a printing pressure adjustment unit of the stencil printing apparatus shown in FIG. 1. FIG.
4 is a diagram showing a configuration of an operation panel of the stencil printing apparatus shown in FIG. 1. FIG.
5 is a diagram showing a display example of a liquid crystal touch panel of the operation panel shown in FIG. 4. FIG.
FIG. 6 is a diagram illustrating a relationship between a pressing force and power consumption.
FIG. 7 is a view showing a display example of a liquid crystal touch panel of an operation panel in the stencil printing apparatus according to the second embodiment of the present invention.
FIG. 8 is a diagram showing the configuration of the energy-saving plate making means of the present invention.
[Explanation of symbols]
1 ... Reading section
2 ... Plate making part
3 ... Plasting part
4 ... Discarding part
5 ... Paper feed section
6 ... Paper discharge section
7 ... Printing section
8 ... Control panel
9 ... Control unit
10 ... Original set stand
11, 12 ... Document sensor
13, 14 ... Document transport roll pair
15 ... Stepping motor
16. Image sensor
17 ... Document discharge tray
18… Stencil paper
19 ... base paper container
20 ... Thermal head
21 ... Platen roll
22 ... Base paper feed roll pair
23 ... Light pulse motor
24 ... Base paper cutter
25 ... Drum drive motor
26 ... plate cylinder
27 ... Base paper clamp
28 ... Base paper confirmation sensor
28a ... detection piece
29 ... Detection piece
30: Reference position detection sensor
31 ... Rotary encoder
32 ... Squeegee roll
33 ... Doctor roll
34 ... Ink
37 ... printing paper
38 ... Paper feeder
39, 40 ... Primary feed roll
41 ... Secondary paper feed roll pair
42: Paper feed sensor
43 ... Feeding clutch
44. Paper separation nail
45 ... Conveyance passage
46 ... Output tray
47 ... Discard transport roll pair
48 ... Discard motor
49 ... Discard box
50 ... Discard sensor
59, 60 ... side fence
61 ... End fence
71: Storage means
72: Printing pressure adjustment section
73 ... Thermal head drive controller
74: External interface section
81 ... Numpad
82 ... START key
83 ... STOP key
84 ... Display section
85 ... LCD touch panel
86: Print density display area
87a, 87b ... Print density setting key
88. Printing speed display section
89a, 89b ... Printing speed setting key
90 ... Trial printing key
100: Stencil printing apparatus
120c ... central axis
140 ... Press roller
141 ... Cam
142 ... Cam follower lever
142a ... axis
142b ... axis
143 ... Lever element
144 ... First lever element
144a ... long hole
144b ... Sliding groove
145 ... second lever element
146 ... engaging terminal
146a ... long hole
147: Support plate part
150 ... pulse motor
150a ... Gear
151 ... Deceleration mechanism
152 ... Large diameter gear
152a ... through hole
153 ... Control rod
154 ... Tension coil spring
155 ... pin
155a ... Long hole
156 ... Oscillating lever
156a ... axis
156b ... axis
156c ... projection
157 ... Connecting plate
158 ... connecting member
159 ... Bracket
159a ... Rotating shaft
171 ... Adjust screw
172 ... Supporting member
191 ... Plunger
191a ... axis
192 ... hook lever
192a ... engaging portion
193 ... Connecting lever
194 ... Plunger lever
194a ... Axis
195 ... Monitoring sensor
196 ... Damper
197 ... Screw
198 ... Solenoid

Claims (8)

A stencil printing apparatus for punching a stencil sheet with a thermal head and performing printing by pressing a printing sheet on a plate cylinder on which the stencil sheet is made,
A setting means for setting energy-saving printing and the degree of energy saving; an energy-saving plate making means for executing energy-saving plate making for the set energy-saving printing; and a printing pressure adjusting unit for controlling the set pressing force;
When the energy saving printing and the degree of energy saving are set by the setting unit, the plate making unit executes the energy saving plate making corresponding to the set energy saving printing by the energy saving plate making unit, and the printing unit presses the printing pressure adjusting unit. An energy-saving stencil printing apparatus characterized by printing under control of pressure. The energy-saving plate making means is composed of at least the thermal head and a thermal head drive control unit for controlling the thermal head, and drives the thermal head so that the temperature of the heat-shrinkable film of the stencil sheet sufficiently exceeds the melting point temperature. The energy saving stencil printing apparatus according to claim 1, wherein the control unit controls the application power and the application time applied to the thermal head to make the plate. The printing pressure adjusting unit has a function of controlling a pressing force that presses the printing paper against the plate cylinder on which the stencil sheet that has been made is made, and according to the degree of energy saving set by the setting unit. The energy-saving stencil printing apparatus according to claim 1, wherein the pressing force is controlled. The printing pressure adjustment unit has a function of controlling a pressing force that presses the printing paper against the plate cylinder on which the stencil sheet is made, and the paper type of the printing paper set by the setting unit The energy-saving stencil printing apparatus according to claim 1, wherein the pressing force is controlled according to the degree of energy saving. A stencil sheet is perforated with a thermal head to make a plate, and a printing method is performed by pressing a printing sheet on a plate cylinder on which the stencil sheet is made.
The energy saving printing and the degree of energy saving are set from the setting means, the plate making unit executes the energy saving plate making corresponding to the set energy saving printing, and the printing part controls the pressing force by the printing pressure adjusting unit. An energy-saving printing method characterized by printing. The energy-saving plate making means is composed of at least the thermal head and a thermal head drive control unit for controlling the thermal head, and drives the thermal head so that the temperature of the heat-shrinkable film of the stencil sheet sufficiently exceeds the melting point temperature. 6. The energy saving printing method according to claim 5, wherein the control unit controls the applied power and the application time applied to the thermal head to make the plate. The printing pressure adjusting unit has a function of controlling a pressing force that presses the printing paper against the plate cylinder on which the stencil sheet that has been made is made, and according to the degree of energy saving set by the setting unit. 6. The energy saving printing method according to claim 5, wherein the pressing force is controlled. The printing pressure adjustment unit has a function of controlling a pressing force that presses the printing paper against the plate cylinder on which the stencil sheet is made, and the paper type of the printing paper set by the setting unit 6. The energy saving printing method according to claim 5, wherein the pressing force is controlled according to the degree of energy saving.

Images