JP3761274B2 - Printing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention feeds a printing paper by aligning the position with a pre-made master wound around a rotatable plate cylinder, presses the printing paper against the plate cylinder through the master, and supplies the ink supplied to the master to the printing paper. The present invention relates to a printing apparatus using a transfer method.
[0002]
[Prior art]
In this type of printing apparatus, data is formed in a perforated state on a master wound in a roll form by a thermal head of the plate making unit and sent to the plate cylinder, and the leading end of the plate made master is placed on the outer periphery of the plate cylinder. When reaching the provided clamper, the clamper is closed, and the plate cylinder is rotated to wind a pre-printed master cut to a desired length around the outer periphery of the plate cylinder.
[0003]
In this case, if the front ends of the master are not aligned, they are held in a biased state by the clamper on the plate cylinder. Therefore, as described in JP-A-6-32041, the front end of the master is aligned before plate making. Master tip cut processing is performed. For example, when the master is cut into the plate making section or when the master is re-set for jam processing, the master leading end cutting process is performed by pulling out the master wound in a roll shape by a predetermined length. This is a process of winding the master around the plate cylinder and cutting the master extending from the plate cylinder with a cutter to align the front ends of the masters to be wound around the plate cylinder.
[0004]
Further, as described in JP-A-6-227110, when a master formed of a single film is guided by a base paper receiving member and guided to the plate cylinder, the master is received by the wind from the air suction device. Jam is prevented by floating from the member, and when the front end of the master is held by the clamper of the plate cylinder, the operation of the air blowing device is switched to the suction side and the master is sucked to the base paper receiving member, thereby The master is wound around the plate cylinder with tension applied to the plate cylinder.
[0005]
[Problems to be solved by the invention]
However, when the master wound in a roll is pulled out and set between the thermal head and the platen roller, the master cannot always be pulled straight out and set. When the pulled out master is bent and set, skew occurs. When the skew is small, the master gradually corrects the direction of travel according to the strength of its own waist, but when the skew is large, the master proceeds with insufficient correction of the course, and the platen roller and thermal head. The bent portion is crushed by a pair of conveyance rollers arranged on the downstream side thereof, or wrinkles are generated.
[0006]
SUMMARY An advantage of some aspects of the invention is that it provides a printing apparatus that can automatically correct the course of a master straight and prevent the occurrence of skew.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a contact / separation drive means for relatively moving the thermal head a plurality of times relative to the platen roller during a period in which the master is conveyed toward the plate cylinder by a certain distance, and a master on the platen roller. Master transport driving means for rotating the platen roller only when the thermal head is in pressure contact. Therefore, the master is held between the thermal head and the platen roller and conveyed by the rotation of the platen roller. However, the master is released from the holding state every time the thermal head is moved away from the platen roller. The course is corrected according to the strength of the waist, but since the release from the holding state is performed in small increments several times, the master corrects the path little by little in the process of being transported a certain distance.
[0008]
According to a second aspect of the present invention, in the first aspect of the present invention, the apparatus further comprises a plate discharging part for peeling off and removing the used master wound around the plate cylinder, and the used master on the plate cylinder by the plate discharging part. After the film is peeled off, the master transport driving means transports the master toward the plate cylinder clamper, holds the transported master by the clamper, and rotates the plate cylinder. At this time, the plate cylinder The master wound around is cut to a length sufficient to cover the opening of the plate cylinder with a cutter, and the master waits for the next plate making instruction. Therefore, the used master is peeled off from the plate cylinder by the plate discharging unit, but immediately after that, the master cut is cut and the cut master is wound around the opening of the plate cylinder for waiting for the next plate making command. Is possible.
[0009]
The invention of claim 3 is claimed in claim 1 In the invention of It further comprises a plate removal part for peeling off and removing the used master wound around the plate cylinder, When the next plate making command is output, before the plate making operation is executed, the used master on the plate cylinder by the plate removing unit of Peeling In parallel with this The master transport drive means transports the master toward the plate cylinder clamper, holds the transported master by the clamper, rotates the plate cylinder, and is wound around the plate cylinder at this time. The master was cut to a length sufficient to cover the opening of the plate cylinder with a cutter. Therefore, The operation time can be shortened by transporting the master toward the plate cylinder in parallel. The
[0010]
According to a fourth aspect of the present invention, in the first aspect of the present invention, the apparatus further comprises a plate discharging unit for peeling off and removing the used master wound around the plate cylinder, and the used master on the plate cylinder by the plate discharging unit. The master is transported toward the clamper of the plate cylinder by the master transport driving means at a timing before the peeling operation, and the transported master is held by the clamper and cut into a cut master having a desired length, By rotating the plate cylinder, the cut master was wrapped around the used master. Therefore, when the master leading end cutting process of cutting and aligning the leading end of the master is performed, the cut master generated at that time can be wound around the plate cylinder in a state of being superimposed on the used master. . As a result, at the time of the next plate making, the used master and the cut master on the plate cylinder are peeled off and removed at once by the plate discharging unit.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. Reference numeral 1 denotes an unprinted master wound in a roll shape. This master 1 is obtained by bonding a porous support to a thermoplastic resin film having a thickness of about 1 to 2 μm. As the support, Japanese paper fiber, synthetic fiber, a mixture of Japanese paper and synthetic fiber is used. Is used. Hereinafter, for convenience of explanation, the master 1a is cut to a desired length in order to align the front end of the master 1 before plate making, and the master 1b is formed by punching data in the master 1 in a perforated state. The one that has been used for printing is referred to as the used master 1c.
[0012]
Around the rotatable plate cylinder 2, a plate making unit 3 for making a plate by heating and punching the master 1 and feeding the plate to the plate cylinder 2, and printing paper fed from a paper feed unit (not shown) A pair of registration rollers 4 transported in time with the progress of the plate-making master 1b wound around the cylinder 2, and printing paper fed from the registration rollers 4 is transferred to the plate cylinder 2 via the plate-making master 1b. A pressing roller 5 for pressing, a peeling claw 6 for peeling the printed printing paper from the plate cylinder 2, a paper discharge unit (not shown) for storing the printing paper peeled by the peeling claw 6, and the plate cylinder 2 The used master 1c is removed from the plate cylinder 2 and is removed.
[0013]
The plate making unit 3 supports a platen roller 9 that is rotationally driven, a thermal head 10, a pair of transport rollers 11 and 12, a cutter 13 that cuts the master 1, and a master 1 from below along a transport path 8 of the master 1. It is formed by sequentially arranging the guide plate 14 and the like. The supply shaft 15 supporting the master 1, the platen roller 9, the transport rollers 11, 12 and the like are rotatably supported by a side plate (not shown) of the main body case of the printing apparatus, and a common transport motor (not shown) is a stepping motor. ). In this case, the peripheral speed of the transport rollers 11 and 12 is configured to rotate at a slightly higher speed than the peripheral speed of the platen roller 9 so as to apply tension to the master 1.
[0014]
Further, contact / separation driving means 16 for bringing the thermal head 10 into and out of contact with the platen roller 9 a plurality of times during a period in which the master 1 is conveyed toward the plate cylinder 2 and a master 1 on the platen roller 9. Master transport driving means (not shown) for rotating the platen roller 9 is provided only when the thermal head 10 is in pressure contact.
[0015]
The contact / separation driving means 16 includes a head arm 18 that supports the thermal head 10 and rotates around the fulcrum shaft 17, and a biasing spring (not shown) that biases the head arm 18 toward the platen roller 9. An eccentric cam 19 that presses the head arm 18 in a direction opposite to the platen roller 9 against the biasing force of the biasing spring, a cam motor (not shown) that drives the eccentric cam 19, and the operation of the cam motor Is formed by a control circuit (not shown) that is controlled by a microcomputer. Specifically, the thermal head 10 contacts the platen roller 9 a plurality of times by intermittently rotating the eccentric cam 19 every 180 ° during a period in which the master 1 is conveyed toward the plate cylinder 2 by a certain distance. It is configured to be separated.
[0016]
In the present embodiment, although details will be described later, when the master 1 does not exist in the plate making unit 3, a message to that effect is displayed on the operation panel (not shown), and the cam motor causes the eccentric cam 19 to be rotated 180 by this display. When the operator rotates the head arm 18 in a direction away from the platen roller 9 and the operator operates an initial set switch (not shown) on the operation panel, the cam motor rotates the eccentric cam 19 by 180 °. The head arm 18 is then released.
[0017]
For example, the master conveyance driving unit controls the rotation of the platen roller 9 by driving a conveyance motor by a sensor (not shown) that detects a state in which the thermal head 10 is closest to the platen roller 9 and a detection signal of the sensor. And a circuit (not shown).
[0018]
The plate cylinder 2 is formed with a non-opening 2a and an opening 2b. A mesh screen formed of a resin or metal net is provided in the opening 2b. The plate cylinder 2 has flanges (not shown) fixed at both ends thereof rotatably supported by an ink pipe 20 fixedly supported on a side plate of the printing apparatus, and is driven clockwise. An ink roller 21 and a doctor roller 22 that are in contact with the inner peripheral surface of the plate cylinder 2 are provided inside the plate cylinder 2 so as to be rotatable with a slight gap therebetween. The ink roller 21 and the doctor roller An ink reservoir 24 that receives ink dropped from a supply hole 23 formed at the lower end of the ink pipe 20 is formed in a wedge-shaped space between the ink pipe 20 and the ink reservoir 20. Ink is supplied to the ink pipe 20 from an ink pack (not shown) provided outside the plate cylinder 2. Further, a stage 25 and a clamper 26 are attached to the outer peripheral surface of the plate cylinder 2 so as to sandwich the leading end of the cut master 1a or the master 1b after the plate making at the non-opening portion 2a. The stage 25 is formed of a magnetic material and has a length along the axial direction of the plate cylinder 2. The clamper 26 is rotatably supported by using a clamper shaft 27 disposed along the longitudinal direction of the stage 25 as a support shaft. The clamper shaft 27 is driven in the rotational direction by a drive unit (not shown).
[0019]
The press roller 5 is rotatably supported at one end of a roller support member 29 that rotates integrally with the arm shaft 28. In the present embodiment, the roller support member 29 is configured to rotate integrally with a pressure arm (not shown) that is driven in synchronization with the rotational movement of the plate cylinder 2.
[0020]
The plate discharging unit 7 includes a plate discharging box 30 and a pair of plate discharging rollers 31 and 32. The plate discharge rollers 31 and 32 are driven by a contact / separation drive unit driven by a plate discharge command signal to approach the plate cylinder 2 and are driven and rotated by a motor (not shown). The rotation direction of one discharge roller 31 is determined counterclockwise, and the rotation direction of the other discharge roller 32 is determined clockwise.
[0021]
Next, the operation will be described. When the master 1 does not exist in the plate making unit 3, a message to that effect is displayed on the operation panel. With this display, the cam motor rotates the eccentric cam 19 by 180 ° to rotate the head arm 18 in a direction away from the platen roller 9. Thereby, the thermal head 10 is maintained in a state of separating from the platen roller 9 (see FIG. 1). The operator attaches a new master 1 wound in a roll shape to the supply shaft 15, inserts the leading end of the drawn master 1 between the platen roller 9 and the thermal head 10, and operates the initial set switch on the operation panel. Then, the cam motor rotates the eccentric cam 19 by 180 ° to release the head arm 18. As a result, the head arm 18 is rotated by the biasing force of the biasing spring, so that the thermal head 10 presses the master 1 against the platen roller 9.
[0022]
When the thermal head 10 presses the master 1 against the platen roller 9, the master conveyance driving means that detects the state conveys the master 1 toward the plate cylinder 2 by a certain distance. This conveyance is due to the rotation of the platen roller 9 and the conveyance rollers 11 and 12. In this conveyance process, the eccentric cam 19 rotates intermittently every 180 °, so that the thermal head 10 contacts and separates from the platen roller 9 a plurality of times. The platen roller 9 and the transport rollers 11 and 12 rotate only when the thermal head 10 presses the master 1 against the platen roller 9.
[0023]
Thus, since the master 1 is released from the holding state every time the thermal head 10 is separated from the platen roller 9, the course is corrected by the strength of its own waist at the moment of the release, but from the holding state. Is released in a plurality of small increments, so that the master 1 corrects the course little by little in the course of being transported by a certain distance. Further, since the platen roller 9 rotates only when the thermal head 10 presses the master 1 against the platen roller 9, the master 1 is in a state where the entire area in the width direction is uniformly held by the platen roller 9 and the thermal head 10. It is conveyed by. That is, when the platen roller 9 and the thermal head 10 are separated, the master 1 may be in contact with the platen roller 9 only on one side. In this state, however, the platen roller 9 does not rotate, so the master 1 is skewed during conveyance. There is nothing. When the master 1 is transported a certain distance, the platen roller 9 and the transport rollers 11 and 12 are stopped by a detection signal of a master transport sensor (not shown) disposed in the transport path of the master 1.
[0024]
In this state, the presence / absence of a plate making command signal is confirmed. If there is no plate making command signal, a standby signal is stored in a memory such as a RAM, but when the plate making command signal is output, the signal is used as a trigger in FIG. As shown, the plate cylinder 2 rotates and stops until the clamper 26 reaches a fixed position on the lower side of the discharge plate portion 7, and the clamper 26 is released. As the clamper 26 is opened, the plate discharge rollers 31 and 32 of the plate discharge unit 7 come into contact with the used master 1c on the plate cylinder 2 and then rotate. It is held by 32 and peeled off from the plate cylinder 2 and discarded in the discharge box 30.
[0025]
When this plate removal operation is completed, the plate cylinder 2 is rotated and stopped until the clamper 26 is positioned almost directly above as shown in FIG. 2, the clamper 26 is kept open, and waiting for the master tip cutting process. To do. That is, the master 1 is further transported toward the plate cylinder 2 by the platen roller 9 and the transport rollers 11 and 12, and the leading end of the master 1 is moved by the number of driving steps of a stepping motor (not shown) that rotates the plate cylinder 2. When it is determined that the clamper 26 has arrived, the clamper 26 is closed, the tip of the master 1 is clamped between the clamper 26 and the stage 25, and the cutter 13 is driven, so that the master 1 has a desired length. The cut master 1a is cut. Subsequently, as shown in FIG. 3, when the plate cylinder 2 rotates and stops to a fixed position where the clamper 26 is located below the plate discharge unit 7, the clamper 26 is opened and the plate discharge rollers 31 and 32 are placed on the plate cylinder 2. The plate cylinder 2 further rotates in the clockwise direction while rotating in contact with the cut master 1a. As a result, the cut master 1 a on the plate cylinder 2 is peeled off from the plate cylinder 2 and discarded in the plate removal box 30.
[0026]
Thereafter, as shown in FIG. 2, the plate cylinder 2 rotates and stops until the clamper 26 is positioned almost directly above, and the clamper 26 is maintained in an open state and waits for plate feeding. Is done. That is, although not shown, the document is sent to the document reading unit by the document separating and conveying device, and the document image is read. The image signal is converted into an electrical signal by a CCD or the like, further converted into a digital signal by an A / D converter, controlled by a plate-making control unit, and output to the thermal head 10, and a platen roller 9 and a transport roller 11, Rotation operation with 12 is controlled. Thereby, data is formed in the master 1 in a punched state.
[0027]
Although plate making is performed in this way, in the process in which the plate-made master 1b that has been made is conveyed toward the plate cylinder 2, the thermal head 10 contacts and separates from the platen roller 9 a plurality of times as described above. The platen roller 9 and the transport rollers 11 and 12 rotate only when the thermal head 10 presses the plate-making master 1b against the platen roller 9, so that the plate-making master 1b moves from the platen roller 9 to the thermal head 10. Every time he leaves, the course is straightened by the strength of his waist.
[0028]
When it is determined that the leading end of the master-making master 1b has reached the clamper 26 based on the number of driving steps of the transport motor that drives the platen roller 9 and the transport rollers 11 and 12, the clamper 26 is pre-processed by the closing operation. Since the plate cylinder 2 rotates at substantially the same peripheral speed as the platen roller 9 at the same time as holding the leading end of the master 1b, the master 1b that has been subjected to plate making is wound around the outer periphery of the plate cylinder 2. When the number of driving steps of the stepping motor that drives the plate cylinder 2 at this time reaches a predetermined value, the cutter 13 is driven and the master 1b that has been subjected to plate making is cut to a desired length that covers the opening 2b of the plate cylinder 2, Note that the rear end of the master 1b that has been cut and made by the rotation of the plate cylinder 2 is drawn out, and the winding around the plate cylinder 2 is completed.
[0029]
When the wrapping of the master 1b having been subjected to the plate making onto the plate cylinder 2 is completed, the printing paper loaded on the paper feeding tray (not shown) is fed by the separation paper feeding device, and the printing paper is synchronized with the rotational movement of the printing cylinder 2. When the registration roller 4 is rotated and conveyed between the plate cylinder 2 and the press roller 5, the roller support member 29 is rotated integrally with the pressure arm so that the press roller 5 is moved to the printing paper on the plate cylinder 2. Press against. As a result, printing is performed.
[0030]
As described above, when performing the master leading edge cutting process for aligning the leading edge of the master 1 before plate making, the cut master 1a formed by the process is wound around the plate cylinder 2 and then peeled off by the plate discharging unit 7 to be removed. Therefore, it is easy to remove the cut master 1a treated as waste, and it is possible to avoid the trouble of dropping into the printing apparatus.
[0031]
Further, in the present embodiment, since the used master 1c wound around the plate cylinder 2 is provided with a plate discharging unit 7 for peeling and removing, the used master 1c on the plate cylinder 2 is peeled off by the plate discharging unit 7. After that, the master 1 is transported toward the clamper 26 of the plate cylinder 2 by the master transport driving means for the master tip cutting process, and the transported master 1 is held by the clamper 26 and the plate cylinder 2 is rotated. The master 1 wound on the plate cylinder 2 at this time is used by waiting for the next plate making command in a state where the master 1 is cut to a length sufficient to cover the opening 2b of the plate cylinder 2 by the cutter 13. The finished master 1c is peeled off and removed from the plate cylinder 2 by the plate removing unit 7, but immediately after that, the cut master 1a cut for the master tip cutting process is used to cover the opening 2b of the plate cylinder 2. Next made It is possible to wait for instructions. Thereby, drying of the ink adhering to the opening 2b of the plate cylinder 2 and adhesion of foreign matters such as dust to the ink adhering surface of the plate cylinder 2 can be prevented.
[0032]
Also, when the next plate making command is output, before the plate making operation is executed, the used master 1c on the plate cylinder 2 is peeled off by the plate removing unit 7 and the master conveyance drive is performed for the master tip cutting process. The master 1 is conveyed by the means toward the clamper 26 of the plate cylinder 2, the conveyed master 1 is held by the clamper 26, the plate cylinder 2 is rotated, and the master 1 wound around the plate cylinder 2 at this time. Is cut to a length sufficient to cover the opening 2b of the plate cylinder 2 by the cutter 13, so that the master 1a cut for the master tip cutting process is transferred to the plate cylinder 2 until the next plate making command is output. It becomes possible to wait in a state of being wound around the opening 2b.
[0033]
Thereby, drying of the ink adhering to the opening 2b of the plate cylinder 2 and adhesion of foreign matters such as dust to the ink adhering surface of the plate cylinder 2 can be prevented.
[0034]
In the case of performing the master leading edge cutting process, when the used master 1c is peeled from the plate cylinder 2, the operation time is shortened by causing the master 1 to be conveyed in the direction of the plate cylinder 2 in parallel. be able to.
[0035]
Furthermore, the master 1 is transported toward the clamper 26 of the plate cylinder 2 by the master transport driving means at a timing before the used master 1c on the plate cylinder 2 is peeled off by the plate discharging unit 7, and the transported master 1 is transported. By holding the clamper 26 and cutting it into a cut master 1a having a desired length and rotating the plate cylinder 2, the cut master 1a is wound on the used master 1c so as to overlap the master 1c. When the master leading end cutting process of cutting and aligning the leading ends is performed, the cut master 1a generated at that time can be wound around the plate cylinder 2 in a state of being superimposed on the used master 1c. Thereby, at the time of the next plate-making, the used master 1c and the cut master 1a on the plate cylinder 2 can be peeled and removed at once by the plate removal unit 7.
[0036]
Further, in the printing apparatus, a primary stop signal may be input by operating a stop key or the like during operation, but the winding of the cut master 1a around the plate cylinder 2 is not completed during the master leading edge cutting process. Alternatively, when the primary stop signal is input when the master-making master 1b is not completely wound around the plate cylinder 2 after the cut master 1a is peeled from the plate cylinder 2, the primary stop signal By performing the control for canceling the interruption, it is possible to avoid a state in which the opening 2b of the plate cylinder 2 is exposed to the outside air. In this case as well, it is possible to prevent the ink adhering to the opening 2b of the plate cylinder 2 from being dried and the adhesion of foreign matters such as dust to the ink adhering surface of the plate cylinder 2.
[0037]
Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those of the previous embodiment are denoted by the same reference numerals, and description thereof is also omitted. In the present embodiment, in the master tip cutting process, the cut master 1a is conveyed until the tip exceeds the position of the clamper 26 of the plate cylinder 2, and then the clamper 26 is closed.
[0038]
Thereby, even when the leading end of the master 1 is broken obliquely as shown in FIG. 5 due to jam processing or the like, the leading end of the master 1 can be reliably held by the clamper 26 over the entire width.
[0039]
In the previous embodiment, the structure in which the thermal head 10 is brought into contact with and separated from the platen roller 9 has been described. However, the platen roller 9 may be brought into contact with and separated from the thermal head 10.
[0040]
【The invention's effect】
According to the first aspect of the present invention, the thermal head is brought into contact with and separated from the platen roller a plurality of times during a period in which the master is conveyed toward the plate cylinder by a certain distance, and the master on the platen roller is moved to the thermal head. Since the platen roller is rotated only when the platen is in pressure contact, the master is held between the thermal head and the platen roller and conveyed by the rotation of the platen roller. The master is released from the holding state every time it is separated, and the course can be corrected by the strength of the master's waist at the moment of release. In this case, since the release from the holding state is performed in small increments a plurality of times, the course can be corrected little by little in the process of transporting the master for a certain distance. Furthermore, since the master can be transported only when the entire area in the width direction is uniformly held by the platen roller and the thermal head, the friction pressure applied to the master during transport can be made uniform and the master can be transported straight. it can. Thereby, the skew of the master can be effectively prevented.
[0041]
According to the invention of claim 2, after the used master on the plate cylinder is peeled off by the plate discharging unit, the master is conveyed toward the clamper of the plate cylinder, and the conveyed master is held by the clamper and the plate Since the cylinder was rotated, the master wound around the plate cylinder at this time was cut to a length sufficient to cover the opening of the plate cylinder with the cutter, so that it waited for the next plate making instruction, The used master is peeled off and removed from the plate cylinder by the plate discharging unit, but it can be put on standby for the next plate making command in a state where the opening of the plate cylinder is covered by the master cut immediately thereafter. Accordingly, it is possible to prevent the ink adhering to the opening of the plate cylinder from being dried using the cut master cut for the master leading end cutting process and the adhesion of foreign matters such as dust to the ink adhering surface of the plate cylinder.
[0042]
According to the invention of claim 3, It further comprises a plate discharging part for peeling off and removing the used master wound around the plate cylinder, When the next plate making command is output, before the plate making operation is executed, the used master on the plate cylinder is discharged by the plate removal unit. of Peeling In parallel with this The master transport drive means transports the master toward the plate cylinder clamper, holds the transported master by the clamper, rotates the plate cylinder, and is wound around the plate cylinder at this time. Since the master was cut to a length sufficient to cover the opening of the plate cylinder with a cutter, The operation time can be shortened by transporting the master in the direction of the plate cylinder in parallel. The
[0043]
According to the invention of claim 4, the master is conveyed toward the clamper of the plate cylinder at a timing before the used master is peeled off by the plate discharging unit, and the conveyed master is held by the clamper. Cut to the desired length of the cut master and rotate the plate cylinder to wrap the cut master on the used master so that it can be cut and aligned. When it is performed, the cut master generated at that time can be wound around the plate cylinder in a state of being superimposed on the used master. Thereby, at the time of the next plate making, the used master and the cut master on the plate cylinder can be peeled and removed at once by the plate discharging portion.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional front view showing a state where a master is set on a plate making unit and a used master on a plate cylinder is peeled in the first embodiment of the present invention.
FIG. 2 is a longitudinal front view showing a state in which a cut master or a plate making master is held by a clamper on a plate cylinder.
FIG. 3 is a longitudinal front view showing a state where a cut mast on a plate cylinder or a used master is peeled off.
FIG. 4 is a longitudinal front view showing a state in which a master is held by a clamper on a plate cylinder in the second embodiment of the present invention.
FIG. 5 is a perspective view showing a relationship between a clamper and a tip of a master.
[Explanation of symbols]
1 Master
1a Cut Master
1b Master-made
1c Used master
2 Version cylinder
2b opening
7 Discarding part
9 Platen roller
10 Thermal head
13 Cutter
16 Contact / separation drive means
26 Clamper

Claims (4)

Data is formed in a perforated state on the master wound in a roll by the thermal head of the plate making unit, and a plate-made master cut by a cutter is wound around the outer periphery of the plate cylinder, and ink is applied to the plate-made master on the plate cylinder. In a printing apparatus that prints by pressing the printing paper on the outer periphery of the rotating plate cylinder,
A contact / separation driving means for relatively contacting the thermal head a plurality of times with respect to the platen roller during a period in which the master is conveyed toward the plate cylinder, and the thermal head press-contacts the master on the platen roller. A printing apparatus comprising: a master conveyance driving unit that rotates the platen roller only when the platen roller is rotated.   A plate discharging unit that peels and removes the used master wound around the plate cylinder is further provided, and after the used master on the plate cylinder is peeled off by the plate discharging unit, the master is driven by the master transport driving means. The plate cylinder is conveyed toward the clamper of the plate cylinder, the conveyed master is held by the clamper, and the plate cylinder is rotated. At this time, the master wound around the plate cylinder is moved by the cutter to the plate cylinder. 2. The printing apparatus according to claim 1, wherein the printer is on standby for the next plate making instruction in a state of being cut to a length sufficient to cover the opening. A plate discharging unit for peeling off and removing the used master wound around the plate cylinder is further provided, and when the next plate making command is output, before the plate making operation is performed, the plate discharging unit performs on the plate cylinder. starts the separation of the used master, in parallel with this master is conveyed toward the clamper of the plate cylinder by the master transport drive means, the plate cylinder retains its conveyed the master with the clamper the rotate the plate by the cutter the master wound on a cylinder, characterized in that so as to cut into the enough length to cover the opening portion of the plate cylinder according to claim 1 the printing apparatus according to this time .   A plate discharging unit for peeling and removing the used master wound around the plate cylinder is further provided, and the master is driven by the master transport driving means at a timing before the used master on the plate cylinder is peeled off by the plate discharging unit. The plate cylinder is conveyed toward the clamper, the conveyed master is held by the clamper and cut into a cut master of a desired length, and the cut master is used by rotating the plate cylinder. The printing apparatus according to claim 1, wherein the printing apparatus is wound over the master.

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