JP2599053Y2 - Plate making machine with master transport path switching device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithographic printing plate making machine utilizing a master roll, and to a plate making device having a device for switching a transport path of a master (plate before plate making) drawn from the master roll.

[0002]

2. Description of the Related Art A lithographic printing plate making apparatus that uses a master roll and cuts a master (a plate before plate making) drawn out of the master roll into a predetermined size to make a plate is widely used. When the master is set on the plate making section with such a plate making apparatus, the master tip is first determined in the machine, and the master tip is slightly cut so that the tip is perpendicular to the transport direction. This eliminates the difference in plate length when setting the master in the plate making machine. Conventionally, the master cut here is left as it is in the transport path, so that the operator has to remove it each time. Unless the master is temporarily stopped when cutting the master from the master roll at a predetermined position, accurate cutting (for example, cutting whose end face is perpendicular to the transport direction) cannot be performed. However, when the transport of the master is temporarily stopped, the charging is temporarily stopped even at a charger provided in the same path as a preparatory stage of plate making, so that electric charges concentrate on that portion, and there is a possibility that plate making quality may be impaired. Further, since the master pulled out from the master roll has a curl, the curl may cause the master to be slackened in an undesirable direction in the plate making apparatus.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for switching a master transfer path which solves all the above-mentioned problems by orienting the leading end of the master in the master transfer path in the plate making apparatus as described above. To provide a plate making apparatus having

[0004]

According to the present invention, there is provided a plate making apparatus having a device for switching a transfer path of a master according to the present invention, in which a leading end of a master drawn from a master roll is cut between transfer rollers by a cutting device. Then, the master is cut to the set length, and the plate making apparatus is charged with the charging unit to form a feed image on the exposure unit. And another subsequent roller pair provided upstream of the charging unit,
A switching device provided between the respective roller pairs and for switching the leading end of the master in a fixed direction for a fixed period, and guiding the master leading end in a tray direction after cutting the master leading end by the cutting device by stopping the preceding roller; Thereafter, the feed speed of the preceding roller pair is set to be higher than that of the subsequent roller pair, and a control device for operating the switching device to form slack of the master in a certain direction is provided. I have.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to an embodiment of a plate making apparatus having a device for switching a master conveyance path according to the present invention shown in the drawings. FIG. 1 is a view showing a main part of an embodiment of a plate making apparatus having a device for switching a transfer path of a master according to the present invention, in an operation state in which the leading end of the master is guided to a receiving tray. FIG. 2 shows the plate making apparatus of the embodiment in a state in which the master has slack. Master role 1
Is guided by the entrance guide plate 2 and guided to a first roller pair formed by a pair of rollers 3 and 4. The second roller pair is a lower roller 6 and an upper roller 7
Is formed from. A cutter device 5 is disposed between the first pair of rollers 3 and 4 and the second pair of rollers 6 and 7. Between the second roller pair 6, 7 and the third roller pair, switching devices 8, 9 for switching the second guide plate 10 and the transfer path of the master are arranged. The third roller pair is composed of rollers 11 and 12, adjacent to the third roller pair, is a master scrap tray 13, and a charging unit 14 downstream of the third roller pair.
(See FIG. 2).

FIG. 3 is a perspective view showing a main part of a switching device of a master conveyance path of the plate making apparatus of the embodiment. The fulcrum shaft 8 of the master transport path switching device is rotatably supported by a bearing mechanism (not shown) immediately below the roller 6 below the second roller pair as shown in FIGS. Lever 9, 9 of the master transport path switching device is fixed to the fulcrum shaft 8 of the master transport path switching device. The position of the levers 9, 9 of this master transport path switching device is shown in FIG.
And at a position different from the second guide plate 10 in a direction perpendicular to the plane of FIG. A collar 17 is provided at one end of the fulcrum shaft 8.
Is fixed, and the eccentric position of the collar 17 and the solenoid 19 are connected by a link 18.

Next, the operation related to the cutting of the leading end of the master will be described mainly with reference to FIG. The tip of the master drawn from the master roll 1 is set by hand by abutting the guide plate 2 at the entrance, between the first pair of rollers 3, 4 and between the second pair of rollers 6, 7 via the cutter device 5. Is done. By pressing a plate feed switch (not shown), the control of each unit is performed as follows by a signal from the control device 20. When the cutter device 5 is operated, the master tip is cut. Next, the second pair of rollers 6, 7 is rotated, and at the same time, the master transport path fulcrum shaft 8 is rotated by the solenoid 19, and the master transport switching lever 9 moves to the position shown by the broken line in FIG.
The master scrap is guided by the master scrap receiving tray 13 along the master transport switching lever indicated by the broken line and dropped.
After that, when the solenoid 19 returns, the master transport switching lever 9 rotates the master transport path switching fulcrum shaft 8 to return the lever 9 to the position indicated by the solid line. The master scraps accumulated in the master scrap tray 13 are manually removed at an appropriate time.

Next, the operation related to the loosening of the master will be described mainly with reference to FIG. After the operation related to the cutting of the leading end of the master is completed, a plate making button (not shown) is pressed to start a plate making operation. The control of each unit is performed as follows by a signal from the control device 20. The feed speeds of the first pair of rollers 3, 4 and the second pair of rollers 6, 7 are set to the same speed, and the speed ratio between the first roller pair 3, 4 and the third roller 11, 12 is set to 1.5: 1. When the master is pulled out from the master roll 1, the first roller pair 3, 4, the cutter device 5, the second roller pair 6, 7, and the third roller pair 11, 12 convey the second roller. Pairs 6, 7 and the third roller pair 11, 1
There is a slack between the two. At an arbitrary time when the slack starts to occur, the slack is rotated by a solenoid 19 disposed separately, and the master transport path switching lever 9 is moved to a position shown by a broken line. Thus, when the master is searching for the slack direction, slack occurs in the direction pressed by the master transport path switching lever 9, and thereafter, the slack increases in the same slack direction.

Since the plate making apparatus having the switching device for the transfer path of the master according to the present invention is constructed and operates as described above, the cutting device 5 is controlled by the control device (CPU 20).
By changing the transport speed of the preceding roller pair related to the second roller pair 6 and the subsequent roller pair before the charging unit,
The master can be slackened between the roller 7 and the third rollers 11 and 12. During the operation of the cutting device 5, while the first roller pair 3, 4 and the second roller pair 6, 7, which are the preceding roller pair, are stopped, the second roller pair 6, 7 and 11, 12 The transport of the master at the charging position is not stopped by digesting the slack. At this time, the loosening direction of the master is generally inevitably determined by the roll direction and the transport direction of the master.To change the loosening direction, the layout of the rollers and the transport direction had to be changed. Then, the operation of the switching devices 8 and 9 eliminates the concern. With the conventional technology, the scraps of the master roll are left on the transport path, and if they are not removed by hand, they cannot move to the next operation, and if they move to the next operation, the scraps will hinder the transport, but this invention Can be forcibly fed so as to accumulate pieces of the master roll without leaving the pieces on the transport path. In operation, the trouble of removing the scrap every time (every time the roll is set on the machine) is eliminated. At the same time, in the present invention, since the orientation when the master roll is loosened can also be forcibly performed, it is not necessary to design the master in the direction in which the master is to be loosened. I was no longer worried.

[0010]

As described above in detail, according to the present invention, when the cut end of the master tip is cut, the second guide 10 has conventionally been turned upward, and the cut end must not fall by natural fall. However, in the present invention, there is no problem even if it is arranged vertically in structure (relation of space, etc.). Since the master scrap is sent to a place outside the normal transport path by the master transport path switching lever, the transport path is not obstructed by forgetting to remove the scrap. The master shards are stored in the master shard pan, so up to a certain amount
There is no problem even if left unattended.
The trouble of removing each time is eliminated. Conventionally, it is a state of waiting for the looseness to occur naturally, so if the transport direction is bad, the occurrence of the looseness is prevented, and if the master is wrinkled or the second guide plate 10 is not provided, the reverse direction is caused. I was sick and hit other mechanisms
The present invention always slacks in the same direction and does not slack in a strange shape.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of a plate making apparatus having a master transport path switching device according to the present invention, in an operation state in which the leading end of a master is guided to a receiving tray.

FIG. 2 is a view showing a main part of the plate making apparatus according to the embodiment, showing a state in which the master has slack;

FIG. 3 is a perspective view illustrating a main part of a switching device of a master conveyance path of the plate making apparatus of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Master roll 2 Inlet guide plate 3 Roller under 1st roller pair 4 Roller on 1st roller pair 5 Cutter device (cutting device) 6 Roller under 2nd roller pair 7 2nd roller pair 8 Roller of master transport path switching device 9 Lever of master transport path switching device 10 Guide plate 11 Roller below third roller pair 12 Roller above third roller pair 13 Master scrap tray 14 Charging Unit 17 Master transport path switching device color 18 Master transport path switching device link 19 Master transport path switching device solenoid 20 Control device (CPU)

──────────────────────────────────────────────────続 き Continuing on the front page (72) The creator Atsushi Yano 3-4-2, Marunouchi, Chiyoda-ku, Tokyo Inside Mitsubishi Paper Mills (72) The creator Rukichi Takanashi 1-35-1, Izumi Honcho, Komae-shi, Tokyo Tokyo Inside Aircraft Instruments Co., Ltd. (72) Inventor Fumio Torii 1-35-1, Izumi Honcho, Komae-shi, Tokyo Tokyo Inside Aircraft Instruments Co., Ltd. (72) Masahiro Nagai 1-35-1, Izumi-Honmachi, Komae-shi, Tokyo Tokyo In Aircraft Instruments Co., Ltd. (72) Inventor Kazuhiko Shioda 1-35-1, Izumi Honcho, Komae-shi, Tokyo Tokyo Aircraft Instruments Co., Ltd. (72) Tatsumi Shiomi 1-35-1, Izumi-Honmachi, Komae-shi, Tokyo (56) References JP-A-62-81647 (JP, A) JP-A-63-11371 (JP, A) JP-A-57-90647 (JP, A) -264269 (JP, A) (58 ) investigated the field (Int.Cl. ^6, DB name) G03G 13/26 - 13/32 G03G 15/00 510 - 534

Claims (1)

(57) [Scope of request for utility model registration] 1. A plate making apparatus for cutting a leading end of a master pulled out from a master roll between conveying rollers by a cutting device, charging the master with a charging unit and sending the master to an exposure unit to form an image, wherein a downstream side of the cutting device. And a pair of other subsequent rollers provided downstream of the pair of rollers and upstream of the charging unit, and the leading end of the master is provided between the pair of rollers in a predetermined direction. A switching device for switching, after stopping the front roller pair and cutting the master front end by the cutting device, guiding the master front end toward the receiving tray, and thereafter, the feed speed of the front roller pair is changed to the rear roller pair. And a control device for activating the switching device in order to form the slack of the master in a certain direction. Plate making apparatus having a switching device for road.