JP2000343803A - Stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a secret without generating a waste of a master in a stencil printer having a drum detachable from a stencil printer body. SOLUTION: A RAM 104 for storing setting of a secret keeping mode is provided at not a body side but a drum 31 side. A main CPU 101 of a controller 100 first judges whether the mode is set to the RAM 104 or not when a print command is input and inhibits a printing operation if the mode is set. Thus, since the setting of the mode in the RAM 104 provided at the drum 31 side is always judged in the state that the mode is set when the drum is replaced, even if an unengraved maser is not mounted when the drum is replaced, its confidentiality can be sufficiently kept, and it can allow both prevention of a waste of the unengraved master and keeping of the secret to be compatible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing apparatus for performing printing by winding a master made on a plate cylinder around an outer peripheral surface thereof, and more particularly to confidentiality of a printed document.

[0002]

2. Description of the Related Art Heretofore, a stencil printing apparatus which performs printing using a thermosensitive stencil sheet (hereinafter, also referred to as a master) has been known. In this stencil printing machine, a master is contacted with a thermal head in which fine heating elements are arranged in a line, and the master is conveyed by a platen roller or the like while energizing the heating elements. After forming the perforated image, the master on which the perforated image is formed is wound around a plate cylinder (hereinafter also referred to as a drum), and the printing paper is moved while being pressed against the outer peripheral surface of the drum by a pressing member such as a press roller. In this way, ink oozes out from the hole of the drum and the hole of the master, and this ink is transferred to printing paper to obtain a print image.

In such a stencil printing apparatus for performing heat-sensitive stencil printing, after printing has been completed and the original has been changed, the next time printing is performed, the operator presses the stencil start key to cause the stencil discharge unit to move from the drum. The used master is peeled off and discarded, and the master made by the plate making section is automatically wound around the drum. This is because when the used master is peeled off from the drum immediately after printing is completed,
The outer periphery of the drum is left exposed to the atmosphere until a new plate-making master is wound prior to the next printing, and if this leaving state lasts for a long time, the outer peripheral surface of the drum (screen) ) And the ink remaining in the openings hardens and the ink flow to the master during printing of the next plate is hindered and good printing may not be performed. This is for preventing the drying of the drum outer peripheral surface by winding it around the outer peripheral surface.

On the other hand, if the used master is left wound around the drum until the next plate making operation as described above, the printing start key or the trial printing key can be used without pressing the plate making start key when the operator changes. When is pressed, the original operator's original content is printed as it is. This is a serious problem when the contents of the manuscript are confidential, such as those that are difficult to be known to others or that are difficult to copy, such as printing of examination questions at schools. Becomes

Japanese Patent Publication No. Sho 62-30117 discloses a confidentiality mode for preventing confidential leakage of originals in order to simultaneously maintain the security of the original contents and prevent the drum outer peripheral surface from drying. JP-A-63-74679,
It is disclosed in JP-A-8-183238.

In Japanese Patent Publication No. Sho 62-30117, when a confidential mode is set, a master on which a confidential document is made must be first discarded, and then an unmade master must be wound around a drum. Thus, drying of the ink on the outer peripheral surface of the drum and the inside of the drum is prevented. However,
No. 30117 describes that it is necessary to discharge and discard the unplated master that has been set on the drum at the next plate making, but it has been pointed out that the master is wasted.

On the other hand, in the apparatus described in JP-A-63-74679, a memory is provided in the main body of the apparatus, and when the security mode is set on the operation panel, the security mode is set. Unless the confidentiality mode is cancelled, the printing operation is restricted (prohibited) while the master plate is still on the drum, so that confidential leakage can be prevented without wasting the master. It is something that can be prevented. However, in the device described in JP-A-63-74679, when the drum is detachable from the apparatus main body, the drum is detached from the main body, and when the drum is mounted on another main body, the drum is attached to the drum. It has been pointed out that printing can be performed using a pre-made master, and confidential leakage cannot be prevented.

[0008]

On the other hand, Japanese Patent Application Laid-Open No. 8-183238 discloses a stencil printing machine in which a drum is detachable from a main body of the apparatus. In order to achieve both security and prevention, when the security mode is set, the printing operation is not performed unless the security mode is released, and the removal of the drum from the apparatus body is also prohibited. It is like that.

However, the apparatus described in Japanese Patent Application Laid-Open No. HEI 8-183238 discloses that when another operator wishes to use a different type of drum or a different color drum, a new master is newly set on the drum. Otherwise, the drum cannot be detached from the apparatus main body, and there is a problem that the master is wasted. Also, at the time of paper jam or maintenance,
Even if the user wants to remove the drum, the same problem as described above occurs if the security mode is set.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a stencil printing apparatus in which a drum can be detachably attached to an apparatus main body, a master can be used without waste.
An object of the present invention is to provide a stencil printing apparatus capable of achieving both security maintenance and prevention of drying of an outer peripheral surface of a drum.

[0011]

In the stencil printing apparatus according to the present invention, a storage means for storing that the security mode is set is provided not on the main body but on the drum side. Determines whether the security mode is set, and if the mode is set, prevents printing on the printing paper so that the security is maintained regardless of whether the drum is replaced or not. Can be prevented from leaking.

In other words, the stencil printing apparatus according to the present invention comprises a stencil making section for making a stencil sheet, winding the stencil sheet thus formed around a detachable plate cylinder, and a used stencil sheet from the outer peripheral surface of the plate cylinder. A plate discharging unit that peels off and discards the paper, a printing unit that prints on printing paper using the pre-made stencil wound on the outer peripheral surface of the plate cylinder, and a printer unit that is used from the outer peripheral surface of the plate cylinder when a prepress command is input. Controls the plate discharge unit to peel and discard the finished stencil, and controls the plate making unit to wrap a new stencil sheet around the outer circumference of the plate cylinder. A stencil printing apparatus comprising: a control unit that controls a printing unit so that printing is performed when is input, and that does not accept a printing command when a confidential command is input. , After the confidential order is entered, Until the order is cancelled, it shall have a storage means for storing that the confidential command has been input, and a storage means for transmitting the information of the storage to the control unit. , A printing section, a plate making section, and a plate discharging section.

When the storage means is provided on the plate cylinder, when the plate cylinder is removed from the stencil printing apparatus main body,
The storage means may be provided on the plate cylinder side instead of the main body side, and the storage means may be provided on the plate cylinder itself, or the storage means may be provided on a support member for supporting the plate cylinder. May be provided.

The phrase "not accepting a print command" means that printing is not performed using a pre-made stencil sheet on a plate cylinder when the print command is input.
The present invention is not limited to one that does not accept the print command itself. For example, when a print command is input while a confidential command is being input, printing is not performed, and when the print command is input, a warning sound or the It may be communicated to the operator by display or the like.

The "print command" includes all commands for performing printing on printing paper, and is not limited to, for example, a command for main printing, and may be used to confirm a printing position, print quality, etc., prior to the main printing. This also includes a command for a test print to be performed.

Thus, when the plate making command is input, the control unit causes the plate discharging unit to perform the plate discharging operation and the plate making unit to perform the plate making operation regardless of whether or not the confidential command is input. In the state in which the confidentiality mode is set, even if a print command is input, all printing operations are restricted (prohibited) and only plate discharging and plate making operations are accepted.

In the stencil printing apparatus according to the present invention, the printing cylinder may be provided with a print prohibiting function in the control unit for preventing a print command from being accepted at least when a confidential command is input. it can.

When providing the print prohibition function on the plate cylinder, the print prohibition function is provided on the plate cylinder side instead of the main body side when the plate cylinder is removed from the stencil printing apparatus main body, similarly to the storage means. What is necessary is just to comprise.

In order to provide the printing inhibition function, for example, a method of preventing the plate cylinder from rotating by an electromagnetic clutch or an electromagnetic brake or the like can be adopted.

The storage means provided in the stencil printing apparatus according to the present invention preferably has a backup function of retaining information stored when the plate cylinder comes off.

Here, in order to provide the storage means with a backup function, for example, a nonvolatile memory may be used as the storage means, or a backup power supply may be provided.

[0022]

According to the stencil printing apparatus of the present invention, the storage means for storing that the confidential mode is set is provided not on the main body but on the drum, and the control unit is provided with a print command input. Sometimes, first, it is determined whether or not the security mode is set in the storage means, and when the security mode is set, the operation is performed so as not to print on the printing paper. In a state in which the confidentiality mode is set, even if a print command is input, the printing operation is prohibited, and the situation in which confidential information is leaked can be prevented.

Further, even when the drum is replaced, if the security mode is set, it is always determined that the security mode is set in the storage means provided on the drum side. Therefore, it is unlikely that other operators will be able to see the image information as printed matter even if the master plate is not set when replacing the drum.
It is possible to sufficiently maintain confidentiality, and it is possible to prevent waste of a blank master used in the conventional confidentiality mode.

That is, according to the stencil printing apparatus of the present invention, irrespective of whether the drum is replaced or not, it is possible to achieve both security maintenance and prevention of drying of the outer peripheral surface of the drum without causing waste of the master. become.

Further, if a printing prohibition function of the control unit for preventing a print command from being received at least when a confidential command is input is provided on the drum side, a drum having upward compatibility can be provided. . That is, when a drum in which a security mode is set in the stencil printing apparatus according to the present invention is mounted on a stencil printing apparatus having a conventional configuration, even if the main body operates to perform a printing operation, the security mode is set on the drum side. Is set, and the printing operation can be prohibited independently of the operation of the main body, so that the printing operation is not actually performed and the confidentiality can be maintained.

If the storage means has a backup function, the stored information can be retained even when the plate cylinder is detached, so that the confidentiality retention performance can be improved.

[0027]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing one embodiment of a stencil printing apparatus according to the present invention.

The stencil printing apparatus 1 shown in FIG. 1 mainly includes a document reading section 10, a stencil making section 20, a printing section 30, a paper feeding section 40, a paper discharging section 50, and a stencil discharging section 60.

The document reading section 10 provided at the upper part of the main body of the stencil printing apparatus 1 is specifically an image scanner.
A line image sensor 12 for reading a document image conveyed in the sub-scanning direction, a document feed roller 13,
DF unit, contact glass, fluorescent light, mirror group,
And a known configuration having a reduction lens and the like.

The stencil making section 20 includes a stencil roll 21, a thermal head 22 composed of a plurality of point heating elements arranged in a horizontal line, stencil feed rollers 23 and 24, a stencil guide roller 25, This is a known configuration having a base paper cutter 28. In the plate making section 20, the thermal head 22
The plurality of point heating elements (heating elements) selectively and individually generate heat, thereby performing perforated plate making in a dot matrix manner on the heat sensitive master M, and cutting the preformed master M by the base paper cutter 28. It is supposed to do.

A printing section 30 provided at the center of the main body of the stencil printing apparatus 1 includes a porous ink-permeable cylindrical drum 31 made of an ink-permeable material such as a porous metal plate and a mesh structure; And a press roller 32 provided below the drum 31. Drum 31
Is rotatably supported by a support member (not shown),
It is provided detachably with respect to the main body. A perforated master M is wound and mounted on the outer peripheral surface of the drum 31.

The press roller 32 is supported by a swinging means (not shown), and its outer peripheral surface is provided so as to be able to freely contact and separate from the outer peripheral surface of the drum 31. P is pressed against the drum 31 to form a print image on the printing paper P.

Inside the drum 31, an ink supply means 35 including a squeegee roller (ink roller) 33 and a doctor roller 34 is provided. Doctor roller 34
Are arranged so that a slight gap is formed between the outer peripheral surface of the squeegee roller 33 and the outer peripheral surface of the squeegee roller 33, and form a wedge-shaped ink reservoir near the outer peripheral surface with the squeegee roller 33. . The ink supplied to the ink reservoir from an ink supply pipe (not shown)
The squeegee roller 33 is supplied to the outer peripheral surface of the squeegee roller 33 by passing through the gap between the squeegee roller 3 and the doctor roller 34.

A paper supply unit 40 provided on one side (left side in FIG. 1) of the printing unit 30 includes a paper supply table 41 on which the print papers P are stacked and placed, and one print paper P from the paper supply table 41. And a pickup roller 42 for taking out the printing paper P
1 and a pair of timing rollers 43 fed out between the press roller 32.

A paper discharge unit 50 provided on the other side (right side in FIG. 1) of the print unit 30 includes a peeling claw 51 for peeling the print paper P from the drum 31, a paper discharge feed belt unit 52, and a printed paper feed belt 52. And a discharge tray 53 on which the printing paper P is stacked.

On one side (upper left side in FIG. 1) of the printing section 30, a plate discharging section 60 provided above the paper feeding section 40 peels the used master M from the drum 31 and removes it from the plate discharging box 69. It has a plate discharging roller 61 for feeding the inside. Inside the plate discharge box 69 that stores used masters inside,
In addition to the plate discharging roller 61, an upper plate discharging member, a lower plate discharging member, a compression plate, and the like (not shown) are housed.

FIG. 2 is a perspective view showing a first embodiment of the drum 31 used in the stencil printing machine 1.

The drum 31 is made of Japanese Patent Publication No. 62-28758.
As shown in Japanese Patent Application Laid-Open No. 4-46236 and Japanese Patent Application Laid-Open No. 9-39363, the stencil printing apparatus main body has a replaceable structure. As shown in FIG. It is rotatably supported and unitized. The drum 31 includes an engaging portion 1 formed on the support plate 121.
At 23, it is detachably engaged with a movable drum support frame 125 which is provided so as to be able to be pulled out and moved to the stencil printing apparatus main body, and the whole is scalable with respect to the stencil printing apparatus main body.

A support frame 122 fixedly connected to a support plate 121 is provided in the drum 31. Support frame 1
A squeegee roller 33 is attached to 22. The squeegee roller 33 is provided in parallel with one generatrix of the drum 31, and is supported by the support frame 122 so as to be rotatable around its own central axis by the support shafts 33 a provided at both ends. The squeegee roller 33 contacts the inner peripheral surface of the drum 31 at a part of the outer peripheral surface, and
1 and is driven to rotate in a counterclockwise direction in FIG.

The support frame 122 fixedly supports the doctor roller 34 obliquely above the squeegee roller 33. The doctor roller 34 is disposed substantially parallel to the axis of the squeegee roller 33 with a predetermined minute gap from the outer peripheral surface of the squeegee roller 33. The doctor roller 34 cooperates with the squeegee roller 33 on one side of the minute gap to form an ink reservoir 14 having a wedge-shaped cross section that is open at the top.
4 is defined.

The support frame 122 has a needle-like detection electrode 1 provided to be suspended toward the ink reservoir 144.
An ink amount detection device 141 having the same is provided. Further, the support frame 122 replaceably supports a cylindrical ink bottle 127 storing ink. The ink bottle 127 has an ink outlet provided at one end thereof connected to an ink suction port (not shown) of an ink supply pump 129 attached to the support frame 122 so as to be able to be inserted and removed.

The ink in the ink reservoir 144 is uniformly supplied to the outer peripheral surface of the squeegee roller 33. When the ink in the ink bottle 127 becomes empty, it is determined that the ink is empty. Until the detection is performed by 141, it functions as a stock for supplying ink to the master M without interruption.

The ink supply pump 129 is connected to the support frame 12
2 is selectively driven by an ink motor 131 attached to the printer 2. Ink supply pump 12
9 are provided with ink supply pipes 134 and 136
Is attached. The ink supply pipe 136 extends along the axial direction of the squeegee roller 33, and supplies ink from the ink supply pump 129 to the ink reservoir 144 from each of the plurality of ink supply ports via the ink supply pipe 134. ing.

Since the drum 31 impregnates the porous structure with the ink, the color of the ink to be used is specified.
Dedicated for blue and red.

As shown in FIG. 2, a sub support plate 145 attached to the support plate 121 has a drum 3 to be used.
1 type or ink bottle 127 inserted into the drum 31
DIP switches 133 and 135 are provided for setting the on / off switching position according to the type. The dip switches 133 and 135 constitute ink type detecting means for obtaining drum information on the type of the drum 31, the type of the ink bottle 127 inserted into the drum 31, the color of the ink, and the like according to the combination of the on and off states. ing. In the example shown in the figure, the drum information in four modes can be set by a combination of the on / off states. For example, when both of the dip switches 133 and 135 are off, black ink is used, the dip switch 133 is off, and the dip switch 135 is on. In this case, the color of the ink is assigned and defined in advance for each mode, such as red ink.

In addition to the color, the drum information may be set according to the types of components having different compositions, physical properties and content ratios of the ink used.

The sub support plate 145 has a RAM 1 to be described later.
04 and the drum 31 are set in the main body of the stencil printing apparatus so that the electrical connector 13 on the main body side of the stencil printing apparatus is
7 is provided with an electrical connector 139 that is automatically connected to the connector 7. By this connector connection, the stored information stored in the RAM 104, the ON / OFF information of the DIP switches 133 and 135, and the ON / OFF information of the ink amount detecting device 141 are transmitted to the main CPU 101 provided on the stencil printing apparatus main body, which will be described later. .

FIG. 3 shows a driving mechanism of the drum 31. Outside the one side plate 31a of the drum 31, a gear 217 centering on the ink supply pipe 136 is fixed to a step (not shown) of the ink supply pipe 136 with a slight gap from the side plate 31a. The distal end of the ink supply pipe 136 penetrates through the gear 217 to form a support frame 122 (not shown).
(See FIG. 2).

The gear 217 has a gear portion 217a and a flange portion 217b.
It is arranged so as to be located on the side a, and a part of the flange portion 217b is cut away. In the vicinity of the gear 217, a gear 218a meshing with the gear 217a and the flange 21 are provided.
8b, and a gear 218 fixed to a support shaft 218c rotatably supported by the stencil printing apparatus main body is provided. The gear 218 is disposed such that the flange portion 218b is located on the side of the side plate 31a, and a part of the flange portion 218b is cut away like the flange portion 217b. The gear 217 and the gear 218 can be freely disengaged in a state where the notch portions of the gears 217 and 218 are aligned with each other.
7b and 218b, the engagement state cannot be released.

As shown in FIG. 2, the drum 31 is mounted on a movable drum support frame 125 provided in the stencil printing apparatus main body.
The engaging portion 123 formed on the support body 121 is configured to be engageable, and in a state shown in FIG. 3 where the cutout portions of the flange portions 217b and 218b coincide with each other, in a direction indicated by a white arrow in FIG. By extracting the stencil, the stencil printer 1 can be removed.

A toothed pulley 219 is fixed to a position of the support shaft 218c between a position rotatably supported by the stencil printing apparatus main body and a position to which the gear 218 is fixed. And a timing belt 221 connected to a toothed pulley 220 fixed to an output shaft end of a main motor 212 attached to the stencil printing apparatus main body. The output shaft of the main motor 212 has an encoder 2
The main motor 21 is provided by a pulse detection sensor 223 attached to the main body of the stencil printing apparatus.
The rotation angle of No. 2 is detected, and the detected angle signal passes through a pulse counter and a comparator (not shown) and is input to a control unit 100 described later.

With the configuration shown in FIG.
12, the output shaft, toothed pulley 220, timing belt 221, toothed pulley 219, support shaft 218
c, the gear 218 and the gear 217,
Is driven to rotate about the ink supply pipe 136.

The stencil printing apparatus 1 includes
Is provided with a control unit 100 for generally controlling all the operations. FIG. 4 shows a circuit block diagram of the control unit 100 together with an operation panel 89. In addition, FIG.
For simplicity of description, only portions relevant to the present invention have been extracted and shown.

In FIG. 4, the control unit 100 includes a main C
It comprises a PU 101, a RAM 102, a ROM 103, and a RAM 104 functioning as a storage unit according to the present invention. The main CPU 101, the RAM 102, and the ROM 103 are configured by a one-chip microcomputer, and are provided in the stencil printing apparatus main body.

On the other hand, as shown in FIG. 2, the RAM 104 is disposed near the dip switches 133 and 135 provided on the sub-support plate 145 of the drum 31, and is connected via the electrical connector 139 and the electrical connector 137. The storage information is configured to be transmitted to the main CPU 101.

The backup battery 1 is stored in the RAM 104.
05 is connected, and is configured to have a backup function so that the written print prohibition information and other storage information are not erased even when the drum 31 is removed from the main body. Note that a backup function may be provided without using the battery 105 by using a nonvolatile memory as the RAM 104.

An operation panel 89 provided on the upper front surface of the stencil printer main body has a stencil start key 70,
In addition to a printing (final printing) start key 71 and a trial printing key 72, a security key 83, a security mode display unit 84 composed of LEDs for displaying the security mode status, and a simple security key 85 are provided. Although not shown, the operation panel 89 further includes a display device including a stop key, a numeric keypad, a clear key, a program key, an enlargement / reduction key, a printing speed setting key, a continuous shooting key, a 7-segment LED, and A well-known key and display device such as a display device including an LCD are provided. The key input information from the operation panel 89 is transmitted to the main CPU 101 of the control unit 100, and the control unit 100 transmits display instructions to the confidentiality mode display means 84 and each display device (not shown).

The main CPU 101 has an operation panel 89
In addition to key input information of the plate making start key 70 and the printing start key 71, a RAM provided on the drum 31
104 and the DIP switches 133 and 135
ON / OFF information, ON / OFF information of the ink amount detection device 141, image data read by the image reading unit 10 and processed by the original image reading circuit therein, and detected by the pulse detection sensor 223, and a pulse (not shown) An angle signal of the motor 212 that has passed through the counter and the comparator is input, and these input signals are subjected to arithmetic processing based on an operation program stored in the ROM 103, and are output by the printing unit 30 and the paper feeding unit 40. And a main drive circuit 150 for controlling the paper discharge section 50 and a plate making drive circuit 1 for controlling the plate making section 10
51 and a plate discharge drive circuit 152 that controls the plate discharge unit 60 are output as operation signals.

The ROM 103 stores a plurality of operation programs for operating each part of the stencil printing apparatus 1.
The RAM 102 has a ROM
The operation program called from 103 is temporarily written. The written operation program is rewritten according to an input from the operation panel 89.

For example, in the simple security mode in which the simple security key 85 is pressed by the operator,
Of the operation programs stored in the ROM 103, only the input from the plate making start key 70 is validated,
Even if a print command is issued from the print start key 71 and the test print key 72, a simple confidentiality mode program for inhibiting the printing operation is called from the ROM 103 and the RAM 1
02 is written. In the simple confidentiality mode, the operation signal from the main CPU 101 is output only to the plate making drive circuit 151 and the plate discharge drive circuit 152, but not to the main drive circuit 150. The operation panel 89 is not provided with a key for canceling the simple security mode. The simple security mode program written in the RAM 102 cannot be directly rewritten, and the main CPU 101 is operated only when the master making start key 70 is pressed. , And the simple security mode is released. This prevents the confidential content from being leaked from the pre-mastered master M, since the simplified confidentiality maintenance mode is not released unless the pre-mastered master M whose confidential content has been pre-plated is peeled off and discarded from the drum 31 by the plate discharging unit 60. Can be.

Next, the operation of the stencil printing apparatus 1 having the above configuration will be described. First, a basic operation from stencil making to printing in the stencil printing machine 1 will be described.

An original is set on an original mounting portion (not shown).
When a master making start key 70 is pressed after the operator sets the master making conditions with various keys on the operation panel 89, the manuscript image is read in the manuscript reading section 10, and the read image is used as an image data signal as a main C signal.
It is sent to PU101.

In parallel with the reading operation in the document reading section 10,
In the plate discharging section 60, a plate discharging operation of separating and discarding the used master M from the outer peripheral surface of the drum 31 is performed. Main CP
An operation signal is sent from U101 to opening / closing means (not shown) on the drum 31, and a clamper (not shown) rotates counterclockwise to release the locked master M from the drum 31. Drum 3 on which used master M is wound on the outer peripheral surface
1 is rotationally driven by a main motor 212 operated by an operation signal from the main CPU 101, and starts rotating in a counterclockwise direction in FIG. The fact that the rear end of the used master M wound on the outer peripheral surface of the drum 31 has reached a predetermined plate discharging position corresponding to the plate discharging roller 61 is determined based on a signal from the pulse detection sensor 223 (see FIG. 2). When the CPU 101 determines, the main CPU 101
The moving means and the driving means (not shown) are operated in response to the command from, the plate discharging roller 61 is rotated, and the lower plate discharging member (not shown) is moved to the drum 31 side. When the outer peripheral surface of the plate discharging roller 61 comes into contact with the used master M on the outer peripheral surface of the drum 31, the drum 31 continues to rotate in the counterclockwise direction. It is picked up in contact with and peeled off from the outer peripheral surface of the drum 31. The used master M that has been peeled off is placed in the plate discharge box 69.
After being housed in, it is compressed by a compression plate not shown,
The plate discharging operation is completed.

From the outer peripheral surface of the drum 31, the used master M
Is completely peeled off, the drum 31 continues to rotate further. Then, when the drum 31 reaches the home position, which is the plate feeding position, the main CPU 101 sends an operation signal to the main motor 212 to stop the rotation of the main motor 212. When the main motor 212 stops, the drum 31 stops at the home position, and the drum 31 enters a plate feeding standby state.

When the plate discharging operation is completed, a plate making operation is performed subsequently. That is, when the drum 31 enters the plate-supply standby state, a stepping motor (not shown) is operated by an operation signal from the main CPU 101 and the stencil feed roller 23
Is rotated and the master M is pulled out from the base paper roll unit 21. From the number of steps of the stepping motor, the main CPU 1 determines that the image forming area of the master M has reached a position corresponding to the point heating element of the thermal head 22.
01, an operation signal is sent from the main CPU 101, the dot heating element of the thermal head 22 selectively generates heat based on the image data signal sent from the document reading unit 10, and the perforated plate making image is printed on the master M. It is formed.

The perforated master M having the perforated perforated image formed thereon is conveyed to the drum 31 by the base paper feed roller 24. When the main CPU 101 determines that the leading end of the plate-making master M has reached the clamp portion (not shown) provided on the outer peripheral surface of the drum 31 from the number of steps of the stepping motor (not shown), an operation signal is sent to the clamp portion. Then, the leading end of the prepressed master M is clamped by the clamp portion, and thereafter, the main motor 101
2, an operation signal is sent to the drum 31 and the master M
Is rotated clockwise at the same peripheral speed as the transport speed of the master M, and the master-making master M is wound around the drum 31. Based on the number of steps of a stepping motor (not shown), the main CPU 1 notifies that the plate making for one plate has been completed.
When the determination is made at 01, the rotation of the stencil feed rollers 23 and 24 is stopped, and the stencil cutter 28 is operated to cut the stencil master M. The cut master M that has been cut is pulled out by the rotating operation of the drum 31, and when the drum 31 reaches the home position again, the main CPU 10
The main motor 212 is stopped by an instruction from the controller 1 and the plate-making operation is completed.

The first print operation is performed subsequent to the printing operation. That is, when the drum 31 stops at the home position, an operation signal is sent from the main CPU 101 to operate the main motor 212, so that the drum 31 is driven to rotate at a low speed and the pickup roller 42 is driven to rotate. Due to the rotation of the pickup roller 42, only the uppermost one printing sheet P out of the plurality of printing sheets P stacked on the sheet feeding table 41 is pulled out and held by the timing roller pair 43. Based on a signal from the pulse detection sensor 223, the main CPU 101 determines that the leading end of the image area of the master M wound around the drum 31 in the rotation direction of the drum 31 has reached a position corresponding to the press roller 32. When the determination is made, an operation signal is sent from the main CPU 101 to the timing roller pair 43, the timing roller pair 43 starts rotating, and the printing paper P is fed between the drum 31 and the press roller 32. The main CPU 101 sends an operation signal to a swinging unit (not shown) that supports the press roller 32 following the operation signal to the timing roller pair 43, and swings the press roller 32. The printing paper P fed from the timing roller pair 43 is pressed by the press roller 32 against the plate-making master M wound around the drum 31. By this pressing operation, the press roller 32, the printing paper P, the pre-mastered master M, and the drum 3
1 is pressed against the outer peripheral surface, and the ink supplied to the inner peripheral surface of the drum 31 by the squeegee roller 33 oozes out from the opening on the outer peripheral surface of the drum 31 and the mesh screen.
The gap between the outer peripheral surface of the drum 31 and the pre-printed master M is filled, and the printing paper P is filled through the perforated portion of the pre-printed master M.
Is transferred to The printing paper P to which the ink has been transferred is separated from the outer peripheral surface of the drum 31 at the tip of the peeling claw 51 and falls downward, and is dropped on the upper surface of the paper discharge feed belt 52 by the suction force of a suction fan (not shown). While being attracted, the paper is conveyed to the lower right in the figure and discharged to the paper discharge tray 53. Through this series of steps, the first print operation is completed, and the stencil printing machine 1 enters a printing standby state.

In the stencil printing machine 1 in which the above-described operations of document reading, plate discharging, plate making, and first printing have been completed, and the print stencil printing apparatus 1 is in a printing standby state, a test printing key is used to check the density and position of a printed image. 72 is pressed. When the test print key 72 on the operation panel 89 is pressed, the ROM 104
After the print prohibition information is stored in the sheet feeder 41 (details will be described later), the uppermost print sheet on the paper feed table 41 is pulled out by the pickup roller 42 in the same manner as in the first print operation. The main CPU 101 operates the main motor 212 to rotate the drum 31 at a high speed. The timing roller pair 43 has the same timing as the first print operation.
The printing paper P is fed between the drum 31 rotating at a high speed and the press roller 32. The fed printing paper P is pressed by the prepressed master M wound on the drum 31 by the press roller 32 to transfer the ink, and after a print image is formed on the upper surface thereof, the peeling nail 51 The sheet is peeled from the outer peripheral surface of the sheet 31, conveyed to the lower right by a sheet discharge belt 52, and discharged to a sheet discharge table 53.
The drum 31 returns to the home position again, and the test printing operation is completed.

After confirming the density and position of the print image by this trial printing, the number of prints is set on a display device (not shown) using a numeric keypad (not shown), and the printing speed is set with a printing speed setting key (not shown). By pressing the print start key 71, the printing paper P is continuously sent from the paper feeding unit 40, and the printing operation (main printing operation) is performed. After the printing operation is completed,
The drum 31 returns to the home position again.

Next, the operation of the present invention when the simple security mode is set will be described with reference to the flowchart shown in FIG. In FIG. 5, the step numbers are denoted by ST.

The operator obtains a printed material through the steps of plate making, plate making, test printing, and printing in the same manner as described above. If the contents of the printed matter require confidentiality, the security key 83 or the simple security key 85 is pressed after the printing operation is completed.

When the simple security key 85 is pressed, a signal is sent from the operation panel 89 to the main CPU 101.
The main CPU 101 determines that the simple confidentiality key 85 has been pressed, and writes the print prohibition information in the RAM 104.

The stencil printing apparatus 1 having the above-described configuration is configured to perform the above-described stencil making operation when the stencil making start key 70 is pressed, regardless of whether the simple confidentiality mode is set. I have.

On the other hand, when the print start key 71 or the test print key 72 is pressed, the main CPU 101
The storage information is read from the RAM 104 provided on the first support part 121 (ST10). The main CPU 101
It is determined whether or not the print information is included in the storage information read from the RAM 104 (ST11). If the print inhibition information is not included, the print operation program is called from the ROM 103 and written into the RAM 102, In accordance with the plate making operation program, the operation shifts to the above-described printing operation and test printing operation (ST20).

On the other hand, if the print information is included in the storage information read from the RAM 104, the main CPU 101 calls the simple security mode program from the ROM 103, writes it into the RAM 102, and According to the holding mode program,
The display device (not shown) provided on the operation panel 89 indicates that the confidential information is being stored (ST30), and prohibits the continuation of the printing operation and the test printing operation (ST31).
-NO).

This simple confidentiality mode is continued until the master making start key 70 is pressed. That is, ST3
0, the main CPU 101 deletes the simple security mode program written in the RAM 102 and presses the master making operation program. Is called from the ROM 103 and the RAM 10
2 and according to the plate making operation program,
The print prohibition information in the RAM 104 is erased to release the simple confidentiality mode, and the fact that plate making is possible is displayed on a display device (not shown) provided on the operation panel 89 (ST3).
2) An operation signal is sent to the stencil driving circuit 151 and the stencil driving circuit 152 to cause the stencil printing device 1 to execute the stencil making operation and the stencil discharging operation, and to put the stencil printing device 1 into a printing standby state.

In this state, the trial printing key 72
When the print start key 71 is pressed, the main CPU 1
01 is stored information read from the RAM 104,
It is determined that the print prohibition information is not included, and the process shifts to the printing operation or the test printing operation as described above (ST20).

Therefore, according to the stencil printing apparatus 1 having the above configuration, the storage information is read from the RAM 104 provided on the drum 31 side, and the print inhibition information indicating the non-simple security mode is included in the storage information. Since it is determined whether or not it is included, if the simple confidentiality mode is set, the printing operation and the test printing operation are prohibited to prevent the situation where the confidential information is leaked. it can.

When a large number of drums such as a color changing drum are owned, the drum may be detached from the stencil printing apparatus and mounted on another stencil printing apparatus. In the apparatus, the RAM 1 with the backup function provided on the drum 31 side must be used.
Since the storage information is read out from the RAM 04 and it is determined whether or not the print inhibition information is included in the storage information, the RAM 1
04 is valid even if the drum is removed from the main body, and the print prohibition information is stored in the RAM 104.
In the drum 31 written in, all operations for printing using the plate-making master M on which printing is currently performed are prohibited, and only the plate discharging operation and the plate making operation are valid.

Therefore, even if the unprinted master is not set when the drum is replaced, the image information is less likely to be seen as a printed matter by another operator, and the confidentiality can be sufficiently maintained. It is possible to prevent a blank master used in the confidentiality mode from being wasted.

In the stencil printing apparatus according to the present invention having the above-described configuration, when the drum is replaced, the master having the plate made thereon is still mounted on the drum. Therefore, it is necessary to peel the master made from the drum and decode the master itself. Cannot prevent a situation where confidential information is leaked.

However, as shown in FIG. 4, a security key 83 and a display device 84 are provided.
No. 38, the processing of the security operation in the conventional security mode and the simple security mode according to the present invention
By adopting a selectable configuration, a device capable of selecting a confidential operation in accordance with the confidentiality of a document can be provided. For example, it is preferable that the confidential operation as in the past is selected for the school term final test and the like, and the simple confidentiality according to the present invention is performed for class newspapers and announcements.

Next, a description will be given of a second embodiment of the drum used in the stencil printing apparatus according to the present invention. FIG. 6 is a perspective view showing a second embodiment of a drum used in the stencil printing apparatus 1, and FIG. 7 is a circuit block diagram of a control unit 100 'using a drum 31' according to the second embodiment. The figure is shown together with the operation panel 89. In FIGS. 6 and 7, elements that are the same as the elements according to the first embodiment shown in FIGS. 3 and 4 are given the same reference numerals, and descriptions thereof will be omitted unless otherwise necessary.

The drum 31 'shown in FIG. 6 is of a type which can be mounted on a conventional stencil printing apparatus and has upward compatibility. The drum 31' is mounted on a conventional stencil printing apparatus. At this time, when the print prohibition information is written in the RAM 104, regardless of the operation program of the main CPU 101 'provided in the stencil printing apparatus main body, the drum 31' side uses the currently-plated master. All the printing operations are prohibited, and only the prepress operation is made valid.

The drum 31 'is connected to the gear 217 in FIG.
Is connected to the ink supply pipe 136. That is, as shown in FIG.
An electromagnetic clutch 300 is fixed to a step (not shown). Outside the one side plate 31a of the drum 31 ', a gear 217' around the ink supply pipe 136 is connected to the ink supply pipe 136 via the electromagnetic clutch 300, and the electromagnetic clutch 300 is disconnected. It is provided so that it can run idle in the mode. Electromagnetic clutch 300
As shown in FIG. 7, based on an operation command from a drum CPU 310 provided on the drum 31 'side,
It is configured to disconnect and connect the transmission of the rotational force of 7 ′ to the ink supply pipe 136. The electromagnetic clutch 300 includes a gear 217 ′ and an ink supply pipe 1.
Any material may be used as long as it can connect and disconnect the rotational force to the motor 36.

Further, as shown in FIG.
Reference numeral 10 denotes a main CPU provided on the stencil printer main body side
101 ′ are connected via electrical connectors 137 and 139.

When power is applied to the stencil printing apparatus 2 according to the present invention using the drum 31 ', the drum CPU 3
10 first sets the electromagnetic clutch 300 to the connection mode so that the rotational force of the gear 217 ′ can be transmitted to the ink supply pipe 136.

On the other hand, as described above, when the simple security key 85 is pressed after the printing operation is completed, a signal is sent from the operation panel 89 to the main CPU 101 ′, and
01 ′ determines that the simple confidentiality key 85 has been pressed, and transmits this key information to the drum CPU 310. When the key information indicating that the simple confidentiality key 85 has been pressed is input from the main CPU 101 ′, the drum CPU 310 writes the print prohibition information into the RAM 104.

Hereinafter, the same operation as when the drum 31 according to the above-described first embodiment is used is performed. That is, when the drum 31 'is mounted on the stencil printing apparatus 2 according to the present invention, the electromagnetic clutch 300 is always set to the connection mode, and the operation of writing the print prohibition information into the RAM 104 is performed via the drum CPU 310. Except for the above, the same operation as the above-described stencil printing apparatus 1 is performed, and when the simple confidentiality maintaining mode is set, only the stencil making operation is accepted, and the printing operation and the test printing operation are prohibited, so that the confidentiality is secured. Leakage can be prevented.

On the other hand, when the power is turned on with the drum 31 'of the present invention mounted on the conventional stencil printing apparatus, the drum CPU 31 provided on the drum 31' side is turned on.
0 determines that the drum 31 'is mounted on a conventional stencil printing apparatus. When the print prohibition information is written in the RAM 104, the electromagnetic clutch 300 is set to the disconnection mode, the gear 217 ′ idles, and its rotational force is not transmitted to the ink supply pipe 136. Only when prohibition information is not written, the electromagnetic clutch 300 is set to the connection mode, and the rotational force of the gear 217 'is
36.

On the other hand, the main CPU provided in the main body of the stencil printing apparatus determines whether or not the print inhibition information has been written in the RAM 104 on the drum 31 'side, and controls the printing operation, the stencil making operation and the like. , It cannot work as described above. That is, even if the print prohibition information is written in the RAM 104 on the drum 31 'side, when the print start key 71 is input, the printing operation is started, the main motor 212 is rotated, and the gear 217' is rotated. However, as described above, the rotational force of the gear 217 ′ is not transmitted to the ink supply pipe 136 because the electromagnetic clutch 300 is set to the disconnection mode when the print inhibition information is written in the RAM 104. Since the drum 31 'does not rotate as a result, printing is not actually performed. In this case, we ’re in confidential mode,
In order to inform the operator that printing is not performed even if the print start key 71 is pressed, it is preferable to provide a buzzer or the like on the drum 31 'so as to emit a predetermined warning sound.

Thus, even when the drum 31 'according to the present invention is mounted on a conventional stencil printing apparatus and used, if the print prohibition information is written in the RAM 104 in advance, only the stencil making operation is activated. In addition, the printing operation and the test printing operation can be prohibited, and the situation in which confidential information is leaked can be prevented.

When the drum 31 'according to the present invention is used by mounting it on a conventional stencil printing apparatus, it is of course impossible to set the simple confidential mode on the conventional stencil printing apparatus main body. Even if the security key 83 is pressed on the side, the key information cannot be written in the RAM 104, and the drum 31 'in which the security mode is set is not transferred to the conventional stencil printing apparatus but to the stencil printing apparatus main body according to the present invention. Even if it is attached, the operation in the simple confidential mode as described above cannot be performed.

However, for example, as shown in FIG. 7, a connector 320 is provided on the side of the drum 31 ', and the modification is made so that the press of the security key 83 is transmitted to the drum CPU 310 via the signal line 321. Thus, at least the fact that confidentiality is required can be written into the RAM 104 as print prohibition information. In this manner, the pressing of the security key 83 on the main body side of the conventional stencil printing apparatus causes the drum 31 ′ written as the print inhibition information in the RAM 104 to be mounted on the stencil printing apparatus main body according to the present invention. At times, the operation in the simple confidential mode as described above can be performed, and the situation in which confidential information is leaked can be prevented.

The drum 31 ′ according to the second embodiment is connected to the gear 21 by the electromagnetic clutch 300.
The transmission of the rotational force of 7 ′ to the ink supply pipe 136 is disconnected so that the drum 31 ′ does not rotate. However, the present invention is not limited to this. For example, an electromagnetic brake may be used instead of the electromagnetic clutch 300. And the main motor 212 may be configured to prohibit the rotation of the drum 31 even when the main motor 212 attempts to rotate the drum 31 during the operation of the electromagnetic brake.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a stencil printing apparatus according to the present invention.

FIG. 2 is a perspective view showing a first embodiment of a drum used in the stencil printing machine shown in FIG. 1;

FIG. 3 is a perspective view showing a driving mechanism of the drum according to the first embodiment;

4 is a circuit block diagram showing a control unit of the stencil printing machine shown in FIG. 1 together with an operation panel.

FIG. 5 is a flowchart illustrating an operation when a simple confidentiality mode is set;

FIG. 6 is a perspective view showing a second embodiment of a drum used in a stencil printing apparatus according to the present invention.

FIG. 7 is a circuit block diagram showing a control unit using a drum according to a second embodiment together with an operation panel.

[Explanation of symbols]

 1, 2 stencil printing apparatus 10 Original reading unit 20 Plate making unit 30 Printing unit 31 Drum (plate cylinder) 40 Paper feed unit 50 Paper discharge unit 60 Plate discharge unit 100 Control unit 101 Main CPU 104 RAM (storage means) 105 Battery (for backup) ) 300 Electromagnetic clutch 310 Drum CPU

Claims (3)

[Claims] 1. A stencil sheet making a stencil sheet, and a stencil making section for winding the stencil sheet thus formed around a detachable plate cylinder, and a stencil plate for peeling and discarding used stencil paper from the outer peripheral surface of the plate cylinder. Unit, a printing unit that prints on printing paper using the pre-made stencil wound on the outer peripheral surface of the plate cylinder, and peeling the used stencil from the outer peripheral surface of the plate cylinder when a plate making command is input While controlling the plate discharge unit to discard
The plate making unit is controlled so as to wind a new stencil sheet on the outer peripheral surface of the plate cylinder, and the printing unit is configured to perform printing when a print command is input when a confidential command is not input. A stencil printing device comprising: a control unit for controlling and not accepting the print command when the confidential command is input, wherein the confidential command is released after the confidential command is input to the plate cylinder. Until the security command is input, and storage means for transmitting the information of the storage to the control unit.The control unit, in accordance with the information of the storage, Printing department,
A stencil printing machine for controlling a stencil making unit and a stencil discharging unit. 2. The stencil printing machine according to claim 1, wherein a function of preventing the printing command from being received at least when the confidential command is input, is provided in the plate cylinder. Printing device. 3. The stencil printing apparatus according to claim 1, wherein said storage means has a backup function of retaining the information of said storage when said plate cylinder comes off.