JP2527603B2 - Fixed position stop device for plate cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a) Field of Industrial Application This invention relates to a plurality of plate mounting portions arranged with a phase difference of 90 degrees in the circumferential surface axial direction of a plate cylinder of a printing machine. In order to perform the work of mounting the printing plate (hereinafter referred to as the printing plate) and the work of removing it, move the plate mounting part of the plate cylinder stopped at an arbitrary rotation phase to the optimum rotation phase. The present invention relates to a device for stopping (hereinafter, referred to as fixed position stop). b) Conventional technology 1 equipped with a plurality of printing units each having a plate cylinder
Usually, a set of rotary presses operates in association with a plurality of sets to perform printing operation, and at the beginning and end of the printing, an extremely large number of plate cylinders are attached / detached to / from a large number of plate cylinders belonging to them. The attachment and detachment of the printing plate involves the work of stopping the plate cylinder at a predetermined position.

Conventionally, this type of plate cylinder fixed position stop control device has a method of detecting the position of the plate mounting portion and applying sudden braking to the plate cylinder, or a method of stopping the plate cylinder by intermittent driving. The former has a drawback that a large shock is applied to the entire device, and the latter has a drawback that the intermittent control mechanism becomes complicated and the reaction time becomes long.

JP-A-48-14406 uses a DC motor to drive the plate cylinder, and controls the supply current to decrease the rotational speed of the plate cylinder before the rotation phase to be stopped is reached, while operating the brake. When the stop position is reached, the current supply to the DC motor is cut off, while the voltage applied to the brake is increased and the brake voltage immediately before the stop is lowered to reduce the shock and stop the plate cylinder in place. Disclose.

Further, JP-B-51-24923 discloses that a low speed driving electric power is supplied to a plate cylinder drive motor to reduce the rotational speed of the plate cylinder, the electromagnetic brake is weakly braked, and then the plate cylinder is forcibly moved to move the plate cylinder. A device for stopping is disclosed.

Further, in Japanese Utility Model Laid-Open No. 62-121937, for example, an induction motor is used as a driving source, and a control signal transmitted from a sequencer in accordance with a job command and a timing control command is converted into a pulse width modulation signal by a CPU, and the motor is used. Is input to the drive circuit of the inverter circuit, where rotation control (rotation amount, direction) is performed via the inverter circuit, and the motor is stopped by supplying power to the inverter circuit by a brake circuit that is activated by a stop signal issued from the CPU. Disclosed is a device that is reached by being shut off.

c) Problems to be Solved by the Invention In each of the above-mentioned known examples, it is attempted to reduce the impact or inertial force associated with the stop, and attempt to improve the accuracy of the fixed position stop by achieving the reduction. However, the accuracy of the stop position is still relatively rough.

The present invention makes every effort to reduce the impact or inertial force when the plate cylinder is stopped, while accurately responding to the variety of arrangement of the plate mounting portion on the peripheral surface of the plate cylinder, accurately determining the rotation phase at which the plate cylinder should stop. The purpose is to detect and improve the accuracy of the stop position.

d) Means for Solving the Problems The plate cylinder fixed-position stop device according to the present invention sets the plate cylinder to a desired fixed position in order to mount or dismount the printing plate on the peripheral surface of the plate cylinder. In a printing machine in which a plurality of plate mounting portions to be stopped at a position are arranged with a phase difference of 90 degrees in the circumferential surface axial direction of the plate cylinder, the operating means for operating the printing machine is A stepwise variable speed drive means with a control unit for rotating the plate cylinder in at least two stages by another system, and a rotation of the plate cylinder by transmitting a pulse matching the rotation of the plate cylinder. A pulse transmission unit for sequentially converting and detecting a phase, and an operation unit for transmitting a command to operate by selectively designating a plate mounting unit disposed on the plate cylinder and the work content to the plate mounting unit, are further provided. Desirability of the plate cylinder set corresponding to a command transmitted from the operation unit The difference between the stop phase value and the stop phase value of the plate cylinder immediately before transmission of the command corresponding to the detection value transmitted from the pulse transmission unit, and the rotational displacement angle of the plate cylinder that can be discriminated from the difference Based on the size of the plate cylinder, the stepped variable speed drive means is operated in the order of low speed / high speed / low speed when the plate cylinder rotational displacement angle is large, and is operated only at low speed when the plate cylinder rotational displacement angle is small. It is an object of the present invention to solve the above-mentioned problems by a configuration including a fixed position stop control unit that selectively controls a set program.

e) Action First, the pulse transmission unit transmits a pulse corresponding to the rotation of the plate cylinder, and the origin pulse transmitted from the pulse transmission unit resets the initial rotation phase of the plate cylinder in the control unit as the origin. The rotation phase of the barrel is converted and detected based on the number of pulses input to the control unit. The initial rotation phase of the plate cylinder is reset every repeated rotation of the plate cylinder and is always calculated from the origin pulse. Therefore, the current rotation phase of the plate cylinder, which is the starting point of the initial rotation phase, is always detected by the control unit.

When the plate wearing command signal or the plate removing command signal from the operation unit is input to the control unit while the plate cylinder is stopped,
The control unit compares the rotation phase at which the plate cylinder should be stopped with the rotation phase of the plate cylinder converted and detected from the number of pulses, and based on the degree of difference, the next rotation control signal, Then, one is selected from (1) large rotational displacement angle and (2) small rotational displacement angle to control the operation of the stepwise variable speed drive means. When the rotational displacement angle is large, the plate cylinder is automatically switched to rotate at a low speed in the initial stage of rotation, a high speed in the middle period, and a low speed again at the final stage by the action of the stepwise variable speed, and the plate cylinder rotates to rotate. When the displacement angle is small, it is driven only at low speed.

When the rotational phase of the plate cylinder converted and detected from the number of pulses reaches the rotational phase of the plate cylinder that should be stopped, the control unit sends a stop signal to stop the stepped variable speed drive means. As a result, the plate cylinder stops, and the plate is attached or detached at the stop position.

f) Examples The present invention will be described in detail below with reference to the drawings by way of specific examples.

In FIG. 1 and FIG. 2, one set of rotary presses comprises a plurality of printing units P1, P2, P3 and one folding unit F, and usually multiple sets of rotary presses (not shown) It is installed so that it can work together. Each of the units P1, P2,
P3 and F are operated by the operating power from each main motor M, and more specifically, the power is transmitted through each relay shaft HS, gear box G, and vertical axis VS, thereby operating. It is interlocked.

Each plate cylinder PC (see FIGS. 4 and 5) of each printing unit P1, P2, and P3 has a plate cylinder gear PG fixed to its axis PS.
And the plate cylinder gears PG are rotated through
It is driven and rotated by the power from VS. Further, the folding cylinder (not shown) of the folding unit F receives power through the folding cylinder clutch FC, so that the rotation operation thereof can be stopped as necessary.

Explaining the part where the printing plate PP is attached to the peripheral surface of the plate cylinder PC, that is, the one commonly used for the aspect of the printing plate mounting part 7, the printing plate mounting part 7 will be described with reference to FIGS. 4 and 5.
In any case, although it is common in that it is provided in a straight line along the circumferential surface axial direction of the plate cylinder PC,
Regarding the phase of the peripheral surface rotation direction, the half PCG on the plate cylinder gear PG side and the remaining half P on the axial center of the plate cylinder PC as a boundary.
Not only is the plate attached with CO shifted 90 degrees from each other, but the length of the plate PP in the circumferential direction is
The plate cylinder PC shown in the figure has a length of the entire circumference in which a single printing plate PP is wound around its peripheral surface 360 degrees, and the plate cylinder PC shown in FIG.
The plate PPA, PPB is a semi-circular type with a circumference of 180 degrees. Therefore, the number of plate mounting parts 7 is 360 for the former.
One per 180 degrees, while the latter is 1 per 180 degrees
It is provided in two, that is, 360 degrees all around.

For such a plate mounting portion on the peripheral surface of the plate cylinder PC, various means for adhering to the peripheral surface of the plate cylinder, such as ink supply means (not shown) and offset printing, for attaching and detaching the plate PP from the outside. In this case, the stop phase is set so that the plate mounting portion stops at a rotation phase that avoids the mounting position of the dampening water supply means or the like.

1 and 2, a pair of blanket cylinder gears BG, BG meshing with each other mesh with dedicated plate cylinder gears PG, PG, respectively, and one gear train is formed by these four gears. It Each of the printing units P1, P2, and P3 is exemplified by a BB type, that is, a pair of blanket cylinder contact type offset printing units (not shown), but the field of use of the present invention is not limited to the above. Not something.

According to the present invention, in the rotary press having the above-mentioned configuration, stepwise variable speed drive means 1 of a system different from the operation drive means is additionally provided, and the plate cylinder PC is moved to an optimum rotation phase via the means.
Stop at that phase and press the specified plate on the peripheral surface of the printing plate PC.
The PP is attached or detached, and its configuration is described below.

In the embodiment shown in FIG. 1, the separate type step-variable speed driving means 1 has a separate input shaft 10 for each gear box G provided in the middle of the operating power transmission system in each printing unit P1, P2, P3. And a pole change motor 11 provided with a stepped variable speed drive source, for example, 32 poles and 4 poles, via a power separating portion, for example, a clutch 12, on the input shaft 10 thereof, and a shaft of the motor 11 In the braking part, for example, the electromagnetic brake 13
And a power supply control unit 14 for controlling power supply to the pole change motor 11, the clutch 12 and the electromagnetic brake 13, and in the embodiment of FIG. The variable speed drive means 1 is installed so as to be transmitted only to the input shaft 10 of another system in the gear box G provided in the middle of the operating power transmission system in the folding unit F.

Each of the stepped variable speed driving means 1 of the different system is controlled by an output from the power supply control unit 14, and each power supply control unit
14 is controlled by an operation signal transmitted from the fixed position stop control unit 2 and the main press board 6 of the rotary press.

The fixed-position stop control unit 2 includes a plate cylinder phase detection unit, a stop phase storage unit, a control signal transmission unit, and a phase memory holding unit, all of which are not shown, and also includes a message storage, if necessary. Then, each rotation phase for stopping the plate cylinder PC is input and stored by the stop phase storage unit, and the stop phase stored therein and the rotation phase of the actual rotating plate cylinder detected by the plate cylinder phase detection unit are stored. Are compared by the control signal transmission unit, and the desired control signal is obtained by the power supply control unit 14
The detected rotational phase of the plate cylinder is constantly updated and input to the phase memory holding unit, and the plate cylinder rotational phase immediately before the power is shut off and stored. The message storage unit stores a message output from the message display unit 38 of the operation switch box 3 described later.

In FIG. 1, FIG. 2 and FIG. 3, one operation switch box 3 is provided for each plate cylinder PC of each printing unit P1, P2, P3, and sends a signal to the fixed position stop control unit 2. To do. The types of switches are illustrated in FIG.

First, when the operation switch 31 is pushed down, the whole apparatus of the present invention becomes operable, and all the switches of other printing operation switch boxes (not shown) are inoperable except for the stop switch. Then, the clutch 12 is engaged, the folding cylinder clutch FC is disengaged, and the plate mounting switch 33 and the plate removing switch 34 are both safely locked.

Next, by operating the plate cylinder peripheral surface axial direction selection switch 32, either the gear side PCG or the operation side PCO is selected and designated as the plate mounting portion in the plate cylinder peripheral surface axial direction. On the other hand, in the case of the plate cylinder shown in FIG. 5, the plate cylinder circumferential direction rotation direction selection switch 37 is the division PPA or PPB on the plate cylinder peripheral surface.
It is used to specify the alternative of.

When the skip switch 35 is pushed down, the safety lock of the plate mounting switch 33 and the plate removing switch 34 is released. The plate mounting switch 33 starts the plate mounting operation by pressing the plate mounting switch 33, and the plate removing switch 34
Pressing down starts the plate separation work. The reset switch 36 does not expose to the surface of the box.

The message display section 38 is used as follows. That is, a message to that effect is provided at each start and end of each operation step, and a message for instructing the next operation is provided for each pressing operation of the skip switch 35. ) Is stored in advance, extracted from those messages, and displayed on the message display section 38 of the operation box 3, an erroneous operation by the operator can be avoided.

The rotation phase of the plate cylinder PC is detected by a plate cylinder phase detection unit (not shown) based on the pulse transmitted by the pulse transmission unit 4. The pulse transmission unit 4 uses, for example, a pulse generator with an origin, and in the illustrated embodiment, the pulse transmission unit is attached to the gear shaft of the folding gear box G, but the attachment position is not limited to this. , Plate cylinder PC
It suffices that they are attached in a relationship interlocking with a rotation axis that can rotate in conformity with the rotation of, that is, one rotation corresponding to one rotation of the plate cylinder PC. The number of pulses from the origin transmitted from the pulse transmission unit 4 is counted by the fixed position stop control unit 2, the rotation phase of the plate cylinder PC currently rotating is detected based on the count value, and these are detected. Will be reset.

Therefore, for example, as a result of rotating the plate cylinder PC with the main power supply of the rotary press turned off, the rotation phase of the plate cylinder just before the main power supply is cut off, which is stored in the fixed position stop control unit 2, and the actual Even when there is a difference between the rotation phases of the plate cylinders of
It is corrected by one rotation of the pulse transmission unit 4 corresponding to one rotation of the plate cylinder.

Further, for example, as a result of rotating the plate cylinder PC in a state in which the interlocking relationship between the relay shaft HS and the plate cylinder PC is disconnected by a clutch (not shown) provided in the relay shaft HS, the rotation of the plate cylinder PC and the folding cylinder (not shown) When the phase relationship is deviated, the phase relationship between the plate cylinder PC and the folding cylinder (not shown) is set by a known clutch register device (not shown), for example, a device shown in Japanese Utility Model Publication No. 55-13035. After correcting the deviation, the fixed position stop control unit 2 corrects the difference between the rotational phase of the plate cylinder PC stored and held and the actual rotational phase of the plate cylinder.

The speed detector 5 is, for example, a folding cylinder gear G (embodiment shown).
Alternatively, it is attached to another rotary shaft, and the operating speed of the rotary press is detected thereby. When the speed detected by the speed detection unit 5 exceeds the set speed, the pulse transmission unit 4 and the fixed position stop control unit 2 during the printing operation.
Can be disabled.

The main press 6 of the rotary press is each main motor M and power control unit.
An operation signal is sent to each of the 14 and the fixed position stop control unit 2.

Now, the operation status of each part generated by operating the above-mentioned configuration will be sequentially described.

First, when the worker inputs the main power source of the rotary press, the pulse transmission unit 4 and the fixed position stop control unit 2 are in an operating state,
Then, when the operation switch 31 on the operation switch box 3 is pushed down, the whole apparatus of the present invention becomes operable, and all the switches of the printing operation switch box (not shown) provided in the other of the invention are stopped. , Inoperative condition, and clutch 12
, The disengagement of the folding cylinder clutch FC, and the safety lock of the plate mounting switch 33 and the plate removing switch 34.

At this stage, the reason why the folding cylinder clutch FC is disengaged is that the folding cylinder does not cause an unnecessary load when the printing material is pulled or returned due to the rotation of the plate cylinder when the plate is attached and detached. This is because

Next, the operator selects the plate cylinder circumferential surface axial direction selection switch 32
Is operated to select and designate whether the plate attachment / detachment site is the gear half PCG or the operation half PC0, as shown in FIGS. 4 and 5, or In the case of FIG. 5, the plate cylinder peripheral surface rotation direction selection switch 37 is further operated to selectively specify the plate cylinder PPA or PPB. And
After that, when the skip switch 35 is pushed down, the safety lock of the plate mounting switch 33 and the plate removing switch 34 is released.

Therefore, the operator selects and pushes down the plate attachment switch 33 for the work of mounting the printing plate and the plate removal switch 34 for the work of removing the printing plate.

The operation of each part in the plate mounting operation will be described below.

Transmission of Rotation Control Signal When the signal from the plate mounting switch 33 is input to the fixed position stop control unit 2, the rotation control signal is transmitted from there to the power supply control unit 14.

This rotation control signal is classified into the following two types, that is, RS1 and RS2, depending on the state of the rotation phase of the plate cylinder PC that is currently stopped.

First, the fixed position stop control unit 2 determines the rotation phase L of the plate cylinder PC that is currently stopped and the plate cylinder PC that should be stopped for mounting the printing plate.
Of the rotational displacement M from the former L to the latter M, as a reference. When the angle is large, the fixed position stop control unit 2 transmits the rotation control signal RS1 to the power supply control unit 14, and the power supply control unit 14 which has input the rotation control signal causes the pole change motor 11 to operate at low speed (32 stations) and high speed. (4 poles) and low speed (32 poles) are switched in this order and rotated in the forward direction. Next, b. When the angle is small, the fixed position stop control unit 2 transmits the rotation control signal RS2 to the power supply control unit 14, and the power supply control unit 14 that has input the rotation control signal RS2 causes the pole change motor 11 to operate at a low speed (32 poles) only. It can be rotated in the forward direction.

In addition to the determination of the magnitude of the rotation change angle, the fixed position stop control unit 2 determines the rotation direction, that is, the rotation phase L of the plate cylinder PC that is currently stopped and the plate is stopped for mounting the plate. In comparison with the rotation phase M of the plate cylinder PC to be performed, when the former L reaches the latter M, it is also determined whether the positive rotation or the negative rotation causes a shorter distance. In this way, it is also possible to combine the determination of the magnitude of the rotational displacement angle with each other to transmit four types of rotational control signals.

Transmission of stop control signal On the other hand, the fixed position stop control unit 2 is equipped with a pulse transmission unit 4-which is mounted so as to rotate in response to the rotation of the plate cylinder PC-for rotation of the pulse transmission unit 4. The number of pulses transmitted along with it is counted, the rotation phase of the currently rotating plate cylinder PC is detected from the count value, and when the detected value matches the set phase at which the stop signal is to be transmitted, stop The control signal SS is transmitted to the power supply control unit 4. Simultaneously with the transmission, the number of times the stop control signal is transmitted is incremented by 1, and the plate wear switch 33 is safely locked.

The power supply control unit 14 that has input the stop control signal cuts off the power supply to the pole change motor 11 and also inputs the power supply so that the braking force of the electromagnetic brake 13 operates, and the operation causes the plate cylinder PC to print. Stop at the optimum rotation phase for mounting the holding side of the plate PP. Thus, the worker is
The holding side of the plate is mounted at a predetermined position of the plate mounting portion 7 on the plate cylinder PC, and after the mounting is completed, the skip switch 35 is pushed down to release the safety lock of the plate mounting switch 33. A signal is transmitted to the fixed position stop control unit 2 by pressing down the plate attachment switch 33.

Transmission of re-rotation control signal The fixed-position stop control unit 2 confirms that the number of transmissions of the stop control signal is one by inputting a signal from the plate attachment switch 33, and then the re-rotation control signal RS1
(This signal is the same as when the angle is large)
To send to.

When the re-rotation control signal RS1 is input to the power supply control unit 14, the pole change motor 11 is switched in the order of low speed / high speed / low speed and is rotated in the forward direction. At the time of the rotation, the worker pulls and holds the tail edge side of the printing plate PP, and the printing plate PP is wrapped around the peripheral surface of the plate cylinder PC.

On the other hand, the fixed-position stop control unit 2 counts the number of pulses transmitted from the pulse transmission unit 4 that rotates in response to the rotation of the plate cylinder, and detects the current rotation detected from the counted value. When the rotation phase of the inner plate cylinder PC matches the set phase at which the restart signal should be sent, the restart control signal SS is sent to the power supply control unit 14. Simultaneously with the transmission, the number of times of transmission of the stop control signal counted up last time is reset to 1 and returned to 0, and further, the plate wear switch 33 is safely locked.

The power supply control unit 14 that has input the restart control signal shuts off the power supply to the pole change motor 11 and inputs power so that the electromagnetic brake 13 operates, and the operation causes the plate cylinder PC to print. Stop at the optimum rotation phase to fix the tail side of PP. Thus, the operator tightens the tail edge side of the plate PP to the plate tightening portion (not shown) provided in the plate mounting portion 7 on the plate cylinder PC.

With the above operations and operations, one cycle of plate mounting operation is completed.

If there is a printing plate to be further mounted subsequent to the above, the operator determines whether or not there is a change in the plate cylinder peripheral surface portion to which the printing plate is to be mounted. After returning to the path I, the operation of the plate cylinder surface axial direction selection switch 32 is executed, and when there is no change, the path is returned to the path of FIG.

If there is no printing plate to be attached, the operator depresses the operation switch 31, and the operation of other devices excluding the pulse transmission unit 4 and the fixed position stop control unit 2 is disabled by the depression. Then, the switch action of the switch box (not shown) for printing operation of the other installation is restored, and further, the clutch 12 is disengaged, and the folding cylinder clutch FC is in the connectable state. The plate mounting operation is completed.

The final connection of the folding cylinder clutch FC is performed by the folding unit F by starting the operation of the rotary press by the main motor M.
The rotation is performed while the vertical axis VS of the carrier box G is being rotated, for example, when the rotation phases are matched by a known clutch registering device (not shown) as described above.

Next, when printing is completed, the work of removing the plate from the periphery of the plate cylinder starts. As shown in FIG. 6, the operation of releasing the printing plate is substantially the same as the operation of installing the printing plate described above, from the pressing of the plate removal switch 34 to the completion of the plate removal. And the direction of rotation after stopping is different. Therefore, the plate separation operation can be easily understood by referring to the flow chart shown in the right half of FIG. 6 and the above description of the plate mounting operation, and the description thereof will be omitted.

If the operation switch 31 is illuminated, and light is turned on when the switch is pressed, and is turned off when the switch is released, it is possible to visually confirm whether the operation of the device of the present invention is possible or not depending on the presence or absence of light. be able to.

In addition, in a case where the stop position of the plate cylinder for the first time is not normal for some reason during one cycle of the plate mounting operation, such a thing is stored in the fixed position stop control unit 5, for example. Can occur due to differences between the rotational phase of the plate cylinder and the actual rotational phase of the plate cylinder--when this occurs, the operator must reset the reset switch 36 with an appropriate tool. After pressing down, the number of times the stop control signal is counted up once is reset by the pressing down and returned to 0, and then the plate wear switch 33 is pressed down to change the operation cycle immediately after the plate body surface selection operation. Return to the state,
By repeating the same operation procedure again, the above trouble is solved.

In the operation described above, the pulse transmission unit 4 is provided in the gear box G of the folding unit F, and all the plate cylinders PC of the pair of rotary presses in FIGS. 1 and 2 are controlled and rotated at the same time. However, the pulse transmission unit 4 is provided for each of the gear boxes G, G, G of the printing units P1, P2, P3, and the relay shaft is provided.
By connecting a clutch (not shown) of the HS to the fixed position stop control unit 2, the clutch of the relay shaft HS can be disengaged or engaged in place of disengagement of the folding cylinder clutch FC caused by pressing down the operation switch 31 of the operation switch box 3. The printing units P1, P2, and P3 may be configured to be in the state, and the above operations may be performed individually.

The present invention is not limited to the above embodiment,
It extends to all design modifications that do not depart from the spirit of the claims set forth in the claims.

g) Effects of the Invention As described in detail above, the present invention relates to driving a printing press operating as in the prior art with respect to moving a plate cylinder stopped at an arbitrary rotation phase to stop it at a desired rotation phase. Without using the same means, a dedicated drive means, for example, a stepped variable speed drive means such as a pole change motor having 32 poles (low speed) and 4 poles (high speed) is separately provided and used. , Because it adopts the method to selectively drive it,
Although the equipment cost is required, it has become possible to stop the plate cylinder at a desired rotational phase by accurately and promptly responding to the variety of arrangement of the plate mounting portion on the peripheral surface of the plate cylinder.

Moreover, the dedicated driving means is made into a stepwise variable speed to correspond to the magnitude of the phase displacement amount of the plate cylinder peripheral surface, and when the rotational displacement angle is large, a low speed / high speed / low speed program is selected. When the rotational displacement angle is small, the program can be selected only at low speeds to control the rotation of the plate cylinder, so that both impact and inertia force at the time of stopping and relaxation of work efficiency can be satisfied. It has become possible.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of the invention device, FIG. 2 is a schematic explanatory view showing another embodiment of the invention device, and FIG. 3 is various kinds of operation units provided for each printing unit. FIGS. 4 and 5 are schematic perspective views showing the topological relationship of the plate mounting portion with respect to the peripheral surface of the plate cylinder, of which FIG. A type in which one plate mounting section is provided for the entire circumference of the plate cylinder,
FIG. 5 exemplifies a mold provided with two perimeters of the plate cylinder. FIG. 6 (I, II) is a flow chart showing an operation example of the present invention, in which Roman numerals shown in the lower part of FIG. 6 (I) and Roman numerals shown in the upper part of FIG. Continuously, a series of flowcharts are formed. P1, P2, P3 ... Printing unit, F ... Folding unit, M ... Main motor, HS ... Relay shaft, G ... Gear box, VS ... Vertical axis, PC ... Plate cylinder, PS ... The axis, PG …… plate cylinder gear, PCG …… plate cylinder gear side half, PC0 …… plate cylinder operating side half, PP …… plate (for plate cylinder peripheral surface 360 °), PPA, PPB …… Printing plate (for 180 ° peripheral surface of plate cylinder) FC …… Folding cylinder clutch, BG …… Blanket cylinder gear, 1 …… Step type variable speed drive means, 10 …… Output shaft of another system, 11 …… Step type possible Variable speed drive source, for example, pole change motor, 12 ... Power separation unit, for example, clutch, 13 ... Braking unit, for example, electromagnetic brake, 14 ... Power control unit, 2 ... Fixed position stop control unit, 3 ...... Operating part, for example, operation switch box 31 …… Operation switch, 32 …… Plate drum circumferential surface axial direction selection switch, 33 …… Plate cover switch, 34 …… Plate removal switch Switch, 35 ...... skip switch, 36 ...... reset switch, 37 …… plate drum peripheral surface rotation direction selection switch, 38 …… message display section, 4 …… pulse transmission section, 5 …… speed detection section, 6… … Main board of rotary press, 7… Plate mounting part.

Claims (1)

(57) [Claims] 1. A printing plate mounting portion which is a target for stopping the plate cylinder at a desired fixed position for mounting or dismounting the plate on or from the peripheral surface of the plate cylinder is the plate. In a printing machine in which a plurality of printing machines are arranged with a phase difference of 90 degrees in the circumferential surface axial direction of the cylinder, the plate cylinder is rotated in at least two stages by a system different from the driving means for operating the printing machine. A stepped variable speed drive unit with a control unit for driving, a pulse transmission unit for sequentially converting and detecting the rotational phase of the plate cylinder by transmitting a pulse matched to the rotation of the plate cylinder, and arranged on the plate cylinder. A plate mounting unit and an operating unit for selectively designating the work content to the plate mounting unit and transmitting an operation command, and a desired stop phase of the plate cylinder set in response to the command transmitted from the operating unit. Value and the detected value sent from the pulse sending unit before Based on the difference from the stop phase value of the plate cylinder immediately before the transmission of the command, and the magnitude of the rotational displacement angle of the plate cylinder that can be discriminated from the difference, the stepwise variable speed drive means is used to determine the rotational displacement angle of the plate cylinder. A fixed-position stop control unit that selectively controls by a program set to operate in the order of low speed / high speed / low speed in the case of large, and operate only in low speed when the rotational displacement angle of the plate cylinder is small, Fixed position stop device for plate cylinder.