JPH0429545B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an automatic plate cylinder system that rotates the plate cylinder to a rotational position suitable for the plate mounting operation and then stops the plate cylinder when mounting a plate on the plate cylinder in a sheet-fed rotary printing press. This relates to a stopping device.

1 to 3 are side views showing the plate mounting procedure, in which ink is supplied from a plurality of ink rollers 3a to 3d, and water is supplied to the plate 2 which is wound and mounted on the plate cylinder 1. Moisture is supplied from the roller 4 and the image on the plate 2 is transferred to the blanket cylinder 5. Around the plate cylinder 1, there is an ink roller 3a.
3d, since the water supply roller 4 and the blanket cylinder 5 are present, the plate mounting work is carried out from below the cover 7 covering the front opening of the frame 6.

Therefore, first, the plate cylinder 1 is rotated in the normal direction and stopped at the clamping position shown in FIG. Insert the head and perform the sucking operation.

Next, the plate cylinder 1 is reversed to the clamping position shown in FIG. 2 and stopped, and the clamping operation is performed by tightening the vise 1a to fix the head of the plate 2.

Next, the plate cylinder 1 was rotated in the normal direction and stopped at the tailing position shown in Fig. 3, and the plate 2 was wound around the plate cylinder 1, and the tail portion of the plate 2 was provided in the same manner as the vise 1a. Insert the vise 1b between the grips, perform the butting operation, and repeat the process of rotating the plate cylinder 1 in the normal direction and stopping it at the butting position, while ensuring the winding condition of the plate 2. , tightening work by tightening the vise 1b, and plate tensioning work by applying tension in the circumferential direction of the plate cylinder 1 by adjusting the adjusting screw of the vise 1b.

At this time, if there is a "twist" in the mounting condition of plate 2, correction work is also done at the same time.

However, in the past, the forward rotation, reverse rotation, and stop control of the plate cylinder 1 was performed manually, requiring an operator in addition to the plate mounting operator, and the work progressed through mutual cooperation. Therefore, it takes a lot of time to install the printer, and it also poses disadvantages such as being dangerous and easily damaging the printing machine.

Although there is a device that uses a proximity switch to automatically stop the plate cylinder 1 at the gripping position, stopping at the gripping position and the butt position is done manually.
This results in the same drawbacks as mentioned above.

The present invention has the purpose of fundamentally eliminating such drawbacks of the conventional method, and automatically stops the plate cylinder at each work position, that is, at each of a plurality of work positions, according to the order in which the plates are installed, in response to a switch operation. The present invention provides an extremely effective plate cylinder automatic stopping device for a sheet-fed rotary printing press.

The details of the present invention will be explained below with reference to FIG. 4 and subsequent figures showing embodiments.

FIG. 4 shows the arrangement of a limit switch used as a detector, (A) is a front view, and (B) is a side view.
Limit switch LS ₁ as a third detector
~LS ₃ is fixed, and each is driven by a cam 1c fixed to the shaft of the plate cylinder 1,
When the plate cylinder 1 rotates to the clamping position shown in Fig. 1, the limit switch LS1 is activated, and when the plate cylinder ₁ rotates to the clamping position shown in Fig. 2, the limit switch LS1 is activated.
When LS ₂ is activated and the plate cylinder 1 is rotated to the bottom position shown in FIG. 3, limit switch LS ₃ is activated, thereby detecting each position.

FIG. 5 is a circuit diagram of the control circuit, in which, in addition to the limit switches LS ₁ to _{LS 3} described above, there is a first switch S ₁ that commands the clamping operation, and a second switch S ₂ that commands the clamping operation. , a third switch S ₃ for commanding the finishing work, and a fourth switch S ₄ for commanding the finishing work and the printing work, and a stepping relay STP for regulating the order of operations. The movable pole r is sequentially moved to the fixed poles a to g by performing a step operation in accordance with the operation of each of the switches _S1 to _S3 .

Moreover, FIG. 6 is a timing chart showing the operating status of FIG. 5, and by sequentially operating each switch S ₁ to S ₄ , it operates as shown in FIG.
It controls forward rotation, reverse rotation, and stopping of the plate cylinder 1.

That is, when switch _S1 is turned on, stepping relay STP operates and movable pole r moves from fixed pole a to fixed pole b, so relay M1 operates,
By closing the circuit BEL with contact M1 ₁ ,
At the same time as the bell rings and an alarm is issued, the timer TM is activated and the contact TM is activated after a certain period of time t.
₁₁ is turned off, the circuit BEL is opened and the bell stops ringing, and at the same time, the contact _TM12 is turned on and the relay MX operates, and the contact _MX1 is turned on via the on contact _M12 . By turning on the circuit FR
By closing the plate cylinder 1, the motor driving the plate cylinder 1 rotates normally at a low speed, and the plate cylinder 1 rotates normally at a low speed.

When the plate cylinder 1 rotates to the gripping position shown in FIG.
Limit switch LS ₁ operates, relay M1
Since MX and timer TM are restored, the circuit
The FR opens, the plate cylinder 1 stops at the gripping position, and the gripping work becomes possible.

In addition, the operation of limit switch LS ₁ operates relay M2 and turns on contact M2 ₁ .
The stepping relay STP operates, and the movable pole r moves to the fixed pole c to prepare for turning on the switch _S2 .

Next, when switch _S2 is turned on, stepping relay STP operates, and movable pole r is connected to fixed pole d.
, relay M3 operates and contact M3
By turning on ₁ and closing the circuit BEL,
The bell rings and an alarm is issued, and the timer TM is activated via contact _M32 , which is turned on.
starts and turns off contact TM ₁ after a certain period of time t, so the circuit BEL opens and the bell stops ringing, and at the same time, contact TM ₂ turns on and relay MX operates, turning on. By closing the circuit RR by turning on the contact _MX2 through the contact _M33 , the motor driving the plate cylinder 1 is reversely rotated at a low speed, and the plate cylinder 1 is reversely rotated at a low speed.

When the plate cylinder 1 rotates to the clamping position shown in FIG.
Limit switch LS ₂ operates, relay M3,
Since MX and timer TM are restored, the circuit
The RR is opened and the plate cylinder 1 is stopped at the clamping position, allowing the clamping operation to be performed freely.

In addition, the operation of limit switch LS ₂ operates relay M2 and turns on contact M2 ₁ , so
The stepping relay STP operates, and the movable pole r moves to the fixed pole e to prepare for turning on the switch _S3 .

Next, when switch _S3 is turned on, stepping relay STP operates, and movable pole r is switched to fixed pole f.
In order to move to
The circuit starts after a certain period of time t after the timer TM starts.
Open BEL and stop the ringing of the bell, and at the same time operate relay MX and close circuit FR.
The plate cylinder 1 is rotated forward at low speed.

When the plate cylinder 1 rotates to the butt position shown in FIG.
Limit switch LS ₃ operates, relay M1,
Since MX and timer TM are restored, the circuit
The FR is opened and the plate cylinder 1 is stopped at the tailing position, making the tailing work possible.

In addition, the operation of limit switch LS ₃ operates relay M2 and turns on contact M2 ₁ , so
The stepping relay STP operates, and the movable pole r moves to the fixed pole g to prepare for turning on the switch _S4 .

Furthermore, if switch _S4 is turned on, relay M5
operates, turning on contacts M5 ₁ to 5 ₃ and contact M
₅₄ is turned off, relay M2 is operated via contact _M51 and the operating limit switch _LS3 , and relay M4 is operated via contact _M53 , and by turning on contact _M41 , the relay M2 is operated via contact M51 and the operating limit switch LS3.
MD operates and turns on contact MD ₁ , turning on switch S ₄
It is assumed that even if the relay M5 is turned off, the relay M5 maintains its operating state.

However, at this time, even if contact M2 ₁ is turned on,
Since contact _M54 is off, stepping relay STP does not operate.

In addition, the relay M1 is operated via the contact _M52 , and the timer TM is activated to close the circuit BEL and ring the bell in the same manner as described above, and to open the circuit BEL after a certain period of time t. At the same time as the ringing of the bell is stopped, the circuit FR is closed and the plate cylinder 1 is rotated forward at low speed.

Then, the limit switch is activated by normal rotation of plate cylinder 1.
LS ₃ is restored and relays M2 and M4 are restored, so relay MD is also restored and contact MD ₁ is turned off, but
Relay M5 has contact M5 ₁ and limit switch.
Self- _holding is performed through the normally closed contact _of LS ₃ and contact M5 ₂ , and relays M1, MX,
By continuing to operate the timer TM, etc., the closed state of the circuit FR is maintained, and the plate cylinder 1 continues to rotate normally.

When the plate cylinder ₁ rotates to the bottom position shown in FIG.
MX and timer T are restored, and the plate cylinder 1 is again stopped at the butt-tapping position, allowing the butt-tightening and printing operations to be performed freely.

Note that the above-mentioned operation is repeated by repeatedly turning on switch _S4 , so the plate cylinder 1 is rotated in the forward direction repeatedly while performing the tightening work and the plate tensioning work. I can do it.

However, even when correcting a "twist" in the plate mounting situation, it is sufficient to perform the same operation as described above.

In addition, an indicator light PL is provided to show that the circuit of switch S ₁ is ready, and when reset switch S ₅ is turned on, relay AS operates together with stepping relay STP, and the contacts
AS ₁ interrupts its own circuit and advances the stepping relay STP.
If switch _S5 is turned on until the indicator light PL lights up, the initial state will be automatically set.

Therefore, by simply operating switches S ₁ to _{S 4} in sequence, the plate cylinder 1 rotates in a predetermined direction and automatically stops at each position, which saves labor and improves safety in plate mounting work. Not only can high speeds be achieved, but damage to the printing press can be completely prevented.

However, proximity switches, photoelectric switches, rotary encoders, etc. may be used in place of the limit switches LS ₁ to LS ₃ , and the same effect can be achieved even if an indicator light similar to the indicator light PL is provided for each of the switches S ₂ to S ₄ . and
The switches S ₁ to _{S 4} may be a single unit, and may be used by sequentially switching them using a switching circuit, and the control circuit may be configured from a semiconductor logic circuit instead of a relay, and some circuits may be added. The present invention can be modified in various ways, such as being applicable to plate removal work.

As is clear from the above explanation, according to the present invention, plate mounting work is made labor-saving, safer, and faster, and the risk of damaging the printing press is completely eliminated, and it is possible to use it in various sheet-fed rotary printing presses. Remarkable effects can be obtained.

[Brief explanation of drawings]

Figures 1 to 3 are side views showing the plate mounting procedure;
Figure 4 is a diagram showing the arrangement of limit switches.
FIG. 5 is a circuit diagram of the control circuit, and FIG. 6 is a timing chart showing the operating status of FIG. 1... Plate cylinder, 1a, 1b... Vise, 1c... Cam, 2... Plate, LS ₁ to LS ₃ ... Limit switch,
_S1 to _S4 ...Switch, STP...Stepping relay, _M1 to _M5 , MX, MD, A...Relay, T
……timer.

Claims (1)

[Scope of Claims] 1. A switch means capable of individually specifying a plurality of operations to be performed when mounting a plate on a plate cylinder, and each execution position of each operation specified using this switch means, that is, a plurality of execution positions. a rotational position detecting means for detecting rotation of the plate cylinder to each of the plate cylinders; and a rotation position detecting means for detecting rotation of the plate cylinder to each of the plate cylinders; 1. A plate cylinder automatic stopping device for a sheet-fed rotary printing press, comprising: a control means for stopping the plate cylinder at a specified operation execution position detected by a position detection means.