JPH0541898Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pressure printing device using a stencil printing original plate.

(Prior Art) The present applicant has previously devised a flat pressure printing device disclosed in Japanese Utility Model Publication No. 15814/1983. This printing apparatus performs printing by pressing printing paper sheet by sheet onto a stencil printing original plate that has been subjected to an inking process after a platemaking process. Generally, stencil printing is performed by passing ink from one side of the stencil paper to the other side through fine holes formed in the stencil paper, and depositing it on the surface to be printed.

(Problem to be solved by the invention) However, the above-mentioned conventional printing devices have the disadvantage that the printing process is time-consuming and labor-intensive because the printing process must be performed one by one. As a result, there is a need for a printing device that can automate the printing process. However, since the above printing method uses a stencil printing process, the printed image is formed with ink, so it takes time for the ink to dry, and during that time, the next printing paper is printed. When paper is placed on top of the printed image, the ink forming the image is transferred to the back side of the printed paper, resulting in a so-called show-through phenomenon. When this show-through occurs, double-sided printing becomes impossible.

The present invention was developed in view of the above-mentioned requests, and its purpose is to eliminate bleed-through by inserting unprinted paper between two printed sheets according to an instruction using an instruction means such as a key. An object of the present invention is to provide a pressure printing device that can prevent such problems.

(Means for Solving the Problems) In order to achieve the above object, a pressure printing device according to the present invention has a stencil paper and an ink-impermeable cover sheet mounted on a frame in an overlapping state, and a A pressure printing device having a stencil printing original in which printing ink is stored in a layer between the cover sheet and the stencil printing original, and performing stencil printing by pressing the stencil paper of the stencil printing original against the printing surface of printing paper, An original plate supporting means for supporting the stencil printing original plate; a printing paper loading means provided at a position facing the stencil printing original supported by the original plate supporting means and for loading printing paper; and the printing paper loading means. a driving means for moving the printed paper to a printable position; a paper ejecting means for ejecting the printed paper to a predetermined location after printing is completed;
and a slip sheet instructing means for instructing to drive the paper ejecting means without driving the driving means after each printing process is completed to eject the printed paper that has not been subjected to the printing process to the predetermined location. It is characterized by what it did.

(Function) In the pressure printing device of the present invention, when interleaving paper processing is instructed by the instruction means, the normal printing process is first performed, the printed printing paper is ejected, and the subsequent printing paper is not subjected to the printing process. Since the paper ejecting process is simply performed without being performed, a sheet for preventing show-through is always placed between the printed sheets that have been printed.

(Example) An example of the present invention will be described below based on the drawings. Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a partially omitted plan view of Fig. 1, Fig. 3 is a side view of the cassette used in Fig. 1, and Figs. 8
The figure is an explanatory diagram of the operation.

In FIGS. 1 to 8, reference numeral 1 indicates the main body of the printing apparatus, 2 indicates a lid attached to the main body 1 so as to be openable and closable, and 3 indicates a pressure plate fixed to the cover 2.
This pressure plate 3 is made of an elastic body. 4
is a stencil printing original plate disposed at a predetermined position below the pressure plate 3, and this stencil printing original plate 4 is made of a frame in which a stencil paper on which a perforated image has been made and an ink-impermeable cover sheet are overlapped with each other. Attach it to the
Printing ink is stored in a layer between the stencil paper and the cover sheet (not shown). This stencil printing original plate 4 is produced by means not shown in the drawings.
It is attached to the lid 2 via the pressure plate 3, and is placed in a predetermined position by closing the lid 2 with respect to the main body 1.

A cassette 5 is detachably attached to the main body 1 and serves as a printing paper loading means. Further, a through hole 6 is bored in the bottom of the cassette 5, and a sill plate 7 is integrally formed in the upper side of the cassette 5. A pressure plate 8 is inserted into the cassette 5 so as to be movable in the vertical direction in FIG. 1, and a plurality of sheets of printing paper 9 are stacked on the pressure plate 8. Therefore, when the cassette 5 is attached to the main body 1, the printing paper 9 is placed facing the stencil printing original plate 4. A frame member 10 is movable within the cassette 5 and surrounds the edge of the printing paper 9. This frame member 10 functions to smoothly perform the printing operation of the printing paper 9, as will be explained later.
As shown in FIG. 3, this frame member 10 has a cutout at its right side 10a, so that the printed paper 9 can be easily discharged from the cassette 5 by a paper discharge device 15, which will be described later.

Below the cassette 5 is a pressure plate 11 that can be inserted into the through hole 6 and that moves the pressure plate 8 upward.
and a crank mechanism 12 that moves the pressure plate 11.
and a motor 13 that drives the crank mechanism 12.
A driving device 14 as a driving means is provided. That is, as the motor 13 is driven, the crank piece 12a of the crank mechanism 12 is decelerated and rotated by a deceleration mechanism (not shown),
Move the pressure plate 11. Here, the pressure plate 11
is moved up and down in a state substantially parallel to the stencil printing original plate 4 by means not shown;
The printing paper 9 stacked on the pressure plate 8 is pressed against the stencil printing original plate 4 in a substantially parallel state. In addition, 35 is a bottom dead center sensor that detects the initial position of the pressure plate 11 by the crank piece 12a;
A top dead center sensor 6 detects a predetermined printing position of the printing paper 9 using a tongue piece 10b provided on the frame member 10.

On the other hand, a paper ejection device 15 is disposed on the right side of the main body 1 with respect to the cassette 5. This paper discharge device 15
1 is a paper ejecting mechanism consisting of a ejecting roller 18 that partially protrudes from a guide plate 17 and rotates clockwise by a motor (not shown), and a paper presser roller 19 that is provided above the ejecting roller 18 and is interlocked with the ejecting roller 18. , and a paper take-out mechanism, which will be described later, and discharges the uppermost printed sheet 9a of the printed sheets 9 onto the sheet discharge tray 21. The paper ejecting mechanism includes a lever 23 having a one-way roller 22 near the free end on the side of the cassette 5, which is rotatably supported, and is regulated by a supporting member 24 so that it can move in the left and right direction. a rack 25, a pinion 26 for moving the rack 25 in the left-right direction, and a pinion 26 for moving the rack 25 in the left-right direction.
It is composed of a motor 27 that drives the lever 23, and a spring body 28 that biases the lever 23 downward. As the rack 25 moves to the left, the one-way roller 22 comes into contact with the end of the uppermost printed paper 9a due to the downward biasing force of the lever 23, and then the right side of the rack 25 is moved. Along with the movement in the direction, the frictional force between the one-way roller 22 and the uppermost printed paper 9a moves the uppermost printed paper 9a to the paper ejecting mechanism, and the uppermost printed paper 9a is ejected. In addition, the detection piece 29 and sensors 30 and 31 provided on the rack 25 detect the rack 2.
5, its movement in the left and right direction is controlled. Also, 3
2 is a rotor attached to the lever 23;
The rotor 32 moves the lever 23 and the one-way roller 22 up and down by moving on the standby table 33.

The present embodiment has the above configuration, and its operation will be explained next. First, the stencil printing original plate 4 with the stencil paper facing downward is attached to the lid 2 so as to be in contact with the pressure plate 3, and then the lid 2 is closed to the main body 1 as shown in FIG. When locked, the stencil printing original plate 4 is placed at a predetermined position. Then, the cassette 5 loaded with printing paper 9 is attached to a predetermined position of the main body 1. At this time, since there is a distance t between the cassette 5 and the stencil printing original plate 4, the cassette 5 and the stencil printing original plate 4 do not come into contact with each other. Further, the pressure plate 11 is connected to the dead center sensor 3 so as not to come into contact with the cassette 5 when the cassette 5 is inserted.
5 is located at the initial position detected by the sensor 31, and furthermore, the paper take-out mechanism 16 is located at the left and right positions detected by the sensor 31.

When a print command is input in this state, motor 1
3 is started, each crank piece 12a, 12a begins to rotate clockwise, and lifts the pressure plate 11 upward in a state substantially parallel to the stencil printing original plate 4. The pressure plate 11 engages with the pressure plate 8 inserted into the cassette 5 and pushes the pressure plate 8 upward. Accordingly, the printing paper 9 and the frame member 10 are lifted upward in a state substantially parallel to the stencil printing original plate 4, and the uppermost printing paper 9a is pressed against the stencil paper of the stencil printing original plate 4, as shown in FIG. . In this state, the top dead center sensor 36 detects and stops the motor 13, thereby printing is performed on the uppermost printing paper 9a. still,
The edges of the printing paper 9 are surrounded by the frame member 10, but since the pressure plate 3 is made of an elastic material,
As the pressure plate 8 presses, printing on the uppermost printing paper 9a is performed reliably. Then, after a predetermined period of time has passed,
The motor 13 rotates in reverse to move the pressure plate 11 downward, releasing the pressure of the printing paper 9 against the stencil printing original plate 4, and peeling off the uppermost printing paper 9a from the stencil printing original plate 4. At this time, the edges of the printing paper 9 are connected to the frame member 1.
0, the uppermost printing paper 9a is smoothly peeled off from the stencil printing original plate 4 due to the load of the frame member 10, and the uppermost printing paper 9a
It is possible to prevent defects caused by sticking to the stencil printing original plate 4. After that, the pressure plate 11
When it descends to the low position shown in the figure, the motor 13 stops, and the printing operation ends.

In addition, in the printing apparatus in this embodiment, the printing density is not set by the pressing force applied to the printing paper 9, but is set by the time interval of pressing the printing paper 9 against the stencil printing original plate 4. Therefore, the print density is set by controlling the stop time of the motor 13 when the printing paper 9 is pressed.
Details regarding this print density adjustment will be described later.

Next, upon completion of the printing operation, the motor 27 of the paper take-out mechanism is started, rotates the pinion 26 clockwise, and moves the rack 25 to the left. As the rack 25 moves, the rotor 32 attached to the lever 23 moves onto the standby stand 33, and when the rotor 32 leaves the standby stand 33, the spring body 28
The one-way roller 22 moves onto the guide plate 17 and rolls on the guide plate 17 due to the urging force. At this time, the one-way roller 22 rotates only counterclockwise as shown in the figure, and as it is moved leftward by the pinion 26, it smoothly rotates the guide plate 1.
Perform the above rolling. And one way roller 2
2 is integrally provided in the cassette 5, and when the detection piece 2 is mounted on the rack 25 and passes over the sabbling plate 7 and is positioned on the right end of the printing paper 9 as shown in FIG.
9 is detected by the sensor 30, the motor 27 is stopped.

At this time, as shown in FIG. 5, if the one-way roller 22 is not in contact with the topmost printing paper 9a, that is, if there is less printing paper 9, a paper ejection sensor (not shown) detects this, and the drive device 1
As shown in FIG. 6, the motor 13 of No. 4 is driven.
Lift the printing paper 9 until it contacts the one-way roller 22.

When the one-way roller 22 senses that it has come into contact with the right end of the uppermost printing paper 9a, the motor 27
is reversed and the rack 25 is moved to the right. At this time, the frictional force generated between the one-way roller 22 and the printing paper 9 moves the printing paper 9 to the right. Note that the edge of the printing paper 9 is surrounded by the frame member 10, but since the side portion 10a of the frame member 10 on the paper discharge side is cut out, the printing paper 9 is carried rightward (paper discharge direction). be able to. Also, at this time, it is possible that multiple sheets of printed paper are conveyed at any time, but the frictional force between the one-way roller 22 and the printed paper and the frictional force between the cutting board 7 and the printed paper are , it is possible to separate only one sheet of the uppermost printing paper 9a and convey it to the paper ejecting mechanism as shown in FIG. At this time, the paper sensor 34 detects this, and a motor (not shown) starts to rotate the discharge roller 18 clockwise.
As shown in the figure, the uppermost printing paper 9a is placed on the paper output tray 21.
send to. At this time, since the rotor 32 attached to the lever 23 rides on the standby table 33, the one-way roller 22 is in a state away from the uppermost printing paper 9a, and the one-way roller 22 is in a state away from the uppermost printing paper 9a.
There is no problem in feeding the paper to the top paper 9a, and there is no fear that the one-way roller 22 will stain the printing surface of the uppermost printing paper 9a.

Note that the motor 27 of the paper feeding mechanism continues to operate even when the topmost printing paper 9a is fed out, and when the rack 25 moves to the rightmost end, the detection piece 29 turns on the sensor 31 and stops. . The motor 13 of the drive device 14 is also started to move the pressure plate 11 to its initial position.

When the feeding of the uppermost printing paper 9a is completed, the motor of the paper ejecting mechanism 18 is stopped, the process returns to the initial setting shown in FIG. 1, and the paper ejecting operation is completed.

As described above, by repeating the above-described printing operation and paper discharging operation, automatic printing of the printing paper is sequentially performed.

By the way, in this embodiment, as a means for removing the printing paper 9, a removing plate 7 formed integrally with the cassette 5 is used, but the removing plate does not need to be provided in the cassette 5, and may be provided on the guide plate 17 side. It may be. Furthermore, as shown in FIG. 9, the printing paper 9 may be separated by using a cutting roller 39 that is driven by the paper discharge roller 18 and rotates counterclockwise. In this case, the paper discharge roller 18 is controlled so that it is rotated when the one-way roller 22 comes into contact with the printing paper 9.

Further, in this embodiment, the printing paper 9 is stacked in the cassette 5, but the printing paper according to the printing apparatus of the present invention does not necessarily have to be stacked in the cassette 5, and is simply stacked on the pressure plate 8. It may also be something you have.
Further, as a drive device 14 that moves the pressure plate 8 in the direction of the stencil printing original plate 4 and prints on the printing paper 9,
It is not necessarily necessary to use the above-mentioned crank mechanism 12, and any device that can move the pressure plate 8 in a state substantially parallel to the direction of the stencil printing original plate 4 may be used. Also,
In the paper discharging device 15 for discharging the printed paper 9, the one-way roller 22 is used to convey the printed paper 9 to the paper discharging mechanism, but the paper discharging device according to the present invention is not limited to this embodiment. Furthermore, the stencil printing original plate 4 does not necessarily need to be attached to the lid 2, and may be attached to and removed from an opening opened by opening the lid 2.

Next, interleaving paper processing by the pressure printing device of the present invention will be explained.

FIG. 10 is a control block diagram of the pressure printing device of the present invention. In the figure, 101 is a control means for controlling each part of the pressure printing device of the present invention.
It is a CPU (central processing unit) and controls each part according to a program stored in a ROM (read only memory) 102. A RAM (random access memory) 103 stores input data and arithmetic processing data, and stores various data such as the input number of prints, various conditions regarding printing, and the number of prints completed. 104 is an input means such as an operation panel provided in the pressure printing device;
This input means includes a numeric keypad 105 for inputting the number of prints, and a print density setting key (instruction means) 1 for instructing the pressing stop time to determine the print density.
06. Keys such as a print start key 107 for instructing to start printing, and an interleaving paper key 108 as an interleaving paper instruction means for instructing to insert unprinted paper between printing papers. It is made up of groups. Reference numeral 110 denotes a display device that displays the print number data, each print setting condition, the number of finished prints, etc. input from the input means 104;
1 is a drive circuit for driving the display device, 109 is a drive circuit for driving the motor 13, 15 is a paper ejection device as a paper ejection means,
Reference numerals 36 and 35 indicate a top dead center sensor and a bottom dead center sensor which are composed of microswitches.

The operation of the press printing apparatus of the present invention described above will be explained according to the flowchart shown in FIG. the above
A program as shown in the flowchart of FIG. 11 is stored in the ROM 102, and the CPU 101 is configured to control each part according to this program.

First, the number of prints is set by operating the numeric keypad 105 from the input means 104 consisting of an operation panel, and the print density is set by using the print density setting key 106. The set print number data and print density condition data are sent to the RAM 1 via the CPU 101.
It is stored in 03. Further, data to that effect is set in the RAM 103 by operating the slip key 108.

Next, when the print start key 107 is operated, the CPU 101 first determines whether the number of print sheets matches the set print number data, that is, whether printing has reached the set number of print sheets. (Step S1). Then, when printing reaches the set number of prints, printing ends. If not, then a command signal for driving the motor 13 is sent from the CPU 101 to the motor drive circuit 109.
is sent, and the motor 13 is turned on (step
S2). This driving of the motor 13 continues until the top dead center sensor 36 consisting of a micro switch is turned on. Then, when the top dead center sensor 36 turns on (step S3), that is, when it is detected that the printing paper 9 has risen to a predetermined position, the drive of the motor 13 is stopped (step S4). As described above, this stop time is set to a pressing time so as to match the print density set by the print density setting key 107. The CPU 101 controls the motor stop time (pressure time) based on the print density data specified by the print density setting key 106 and stored in the RAM 103. That is, if the print density data stored in the RAM 103 is data indicating "dark", the motor stop time (pressure time) is set to 3 seconds (steps S5→S6), and if the data indicates "normal", the motor stop time (pressure time) is set to 3 seconds. The motor stop time (pressurization time) is set to 2 seconds (steps S7→S8), and if the data is different from both, it is judged as "thin" and the motor stop control is performed with the motor stop time (pressurization time) set to 1 second. (Step S9). When the motor stop time (pressure time) corresponding to the set print density has elapsed, the motor 13 is driven and the bottom dead center sensor 35 is activated.
The drive continues until it turns ON (step
S10). Then, when the bottom dead center sensor 35 turns on,
The drive of the motor 13 is stopped (step S11→
S12). At this point, the printing process ends.

Next, the paper ejection device 15 is driven as described above,
The printed printing paper 9 is discharged onto the paper discharge table 21 (step S13). Thereafter, it is determined whether or not interleaving paper processing is instructed by the interleaving paper key 108 (step S14), and if so, then printing processing is not performed and only paper ejection processing is performed (step S15). In other words, when interleaving paper processing is instructed by the interleaving paper key 108, the paper ejection process is performed without driving the motor 13 and performing the operation (printing process) of pressing the printing paper 9 against the stencil printing original plate 4. The printing paper that has not been subjected to printing processing is discharged. Along with this paper ejection process, the print setting number data set in a counter (not shown) is counted down (step S16). This data is displayed on the display device 110 as the number of printed sheets. The above-described printing process and paper ejection process are performed until the set number of sheets to be printed is reached.

(Effect of the invention) In the pressure printing device of the invention, the paper that will not be printed is always ejected after printing according to the instruction from the interleaving paper indicating means, so that the back side of the paper that is then printed and ejected is smeared with ink. It is possible to prevent bleed-through.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a partially omitted plan view of Fig. 1, Fig. 3 is a side view of the cassette used in Fig. 1, Figs. 10 is a control block diagram of the present invention, and FIG. 11 is a control block diagram of the present invention.
The figure is a flow chart for explaining the operation of the present invention. 3... Pressing plate, 4... Master plate for stencil printing, 8... Pressure plate, 9... Printing paper, 14... Drive device, 15...
. . . Paper discharge means (paper discharge device), 101 . . . CPU (control means), 108 .

Claims (1)

[Claims for Utility Model Registration] A stencil paper and an ink-impermeable cover sheet are attached to a frame in an overlapping state, and printing ink is stored in a layer between the stencil paper and the cover sheet. A pressure printing device that includes a stencil printing original plate and performs stencil printing by pressing the stencil paper of the stencil printing original plate against the printing surface of printing paper, comprising: original support means for supporting the stencil printing original plate; and the original plate support. a printing paper stacking means for stacking printing paper, provided at a position facing the stencil printing master supported by the means; a driving means for moving the printing paper stacking means to a position where printing is possible; a paper discharging means for discharging the printed paper to a predetermined location; and a paper discharging means for driving the paper discharging means without driving the driving means after each printing process is completed to deliver the unprinted paper to the predetermined location. A press printing device comprising: a slip sheet instruction means for instructing to eject a sheet; and a press printing device.