JPS6061266A - Automatic stopping device for form cylinder in sheet-fed rotary press - Google Patents

Abstract

PURPOSE:To enable to save labor and to secure safety in replacing and fitting a form, by a method wherein pulses according to the rotation of a form cylinder are generated by an encoder, are counted, and a stopping position of the form cylinder is controlled on the basis of a count output. CONSTITUTION:The encoder RE connected to a rotary part of a printing press generates one pulse Pa and 1,000 pulses Pb for each revolution of the form cylinder, a counter CUT counts the pulses Pb, and is reset by the pulse Pa, which operation is repeated for each revolution of the form cylinder. The count output is passed through a selector SEL for sampling the position of the form cylinder, is converted into a controlling pulse having a predetermined width by a pulse- generating circuit PG consisting of a monostable multivibrator or the like, and the controlling signal is inputted into a controlling circuit CNT. According to the operation of a switch SW, controlling outputs based on the controlling pulse are sequentially outputted to each part of the press to control a main motor M for driving the press or the like. Accordingly, it can be contrived to save labor and to secure safety in replacing and fitting the form, and accidents such as breakage of the press can be avoided.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention is directed to a sheet-fed rotary printing press in which, when a plate is replaced or mounted on a plate cylinder, the plate cylinder is moved to a rotational position suitable for the plate replacement and mounting work. This relates to an automatic plate cylinder stop device that rotates and then stops the plate cylinder.

[Prior art]

1 to 3 are side views showing the plate exchange procedure,
Ink is supplied from a plurality of ink rollers 3a to 3d to a plate 2 which is wound and mounted on a plate cylinder 1, and water is supplied from a water supply row 24, thereby transferring the image on the plate 2 to a blanket cylinder 5. Around the plate cylinder 1, there are ink rollers 3a to 3d.

Since the water supply roller 4 and the blanket cylinder 5 are present, the plate replacement operation is performed from below the cover 7 covering the front opening of the frame 6.

Therefore, first, the plate cylinder 1 is reversed to the plate removal position shown in FIG. The plate 2 is removed from the vise 1a+1b and the plate 2 is removed while the plate cylinder 1 is reversed.

Next, the plate cylinder 1 is rotated in the normal direction to the clamping position shown in FIG. Do the following.

Next, the plate cylinder 1 is rotated forward to the butt position shown in Fig. 3 and then stopped, the plate 2 is wound around the plate cylinder 1, and the tail of the plate 2 is held between the gripping fittings of the vise 1b. Insert it into the body and perform the skin tightening and buttocks tightening work.

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 changing operator, and the work was progressed through mutual cooperation. As a result, it takes a lot of time to replace the printer, and it also poses drawbacks such as being dangerous and easily damaging the printing press.

Although there is a device that uses a proximity switch to automatically stop the plate cylinder 1 at the grip position, stopping at the skin contact position is done manually, which has the same drawbacks as mentioned above.

[Summary of the invention]

The purpose of the present invention is to fundamentally eliminate such drawbacks of the conventional technology, and the purpose of the present invention is to generate pulses corresponding to the rotation of the plate cylinder using an encoder connected to the rotating part of the printing press, and to count these pulses using a counter. , an extremely effective sheet-fed rotary printing machine that controls the stop position of the plate cylinder by sending out a count output according to the rotation angle of the plate cylinder and operating a control circuit based on this count output. The present invention provides an automatic plate cylinder stop device.

〔Example〕

The present invention will be described in detail below from FIG. 4 showing an embodiment.

FIG. 4 is a block diagram of the control system, in which a rotary encoder RE connected to the rotating part of the printing press is provided, and the plate cylinder 1
1 pulse Pa per rotation of , and 1 pulse Pa per rotation of
000 pulses pb,
The counter CUT counts the pulses pb and sends out a count output according to the rotation angle of the plate cylinder 1, but the pulse Pa
In addition, the same operation is repeated every rotation of the plate cylinder 1.

Therefore, the count value of the counter CUT indicates the rotation angle of the plate cylinder 1, and this count output is sent to the selector which selects the count value corresponding to each position in FIGS. 1 to 3. The pulses are extracted by SEL, each is given to a pulse generation circuit PG such as a monostable multivibrator, converted into a control pulse of a predetermined width, and then sent to a control circuit C.
Given to NT.

The control circuit CNT uses a sequence circuit such as a relay, which sequentially sends control outputs to each part of the printing press in response to the operation of the switch SW and based on control pulses. Controls the main motor M, etc.

The control circuit CNT is supplied with a detection signal SD from a safety device of the printing press, and sends out a control output with reference to these conditions.

5 and 6 are comprehensive flowcharts of the control situation. FIG. 5 shows the automatic cleaning device that automatically cleans the blanket of the blanket cylinder 5, and FIG. 6 shows the automatic cleaning device that automatically cleans the blanket of the blanket cylinder 5. In Figure 5, first, when the required number of prints is set by 1 preset counter set, 1 automatic blanket cleaning' is performed, then 1 plate exchange' is performed. After that, the process moves to 1 printing'.

In contrast to the above, in Fig. 6, when the 1 preset counter is set, the 1st plate is immediately replaced 1y, and then the 1st blanket is manually cleaned, and then the process moves to ``Printing''. do.

In addition, in Fig. 5, cleaning the blanket while preparing the replacement plate will improve work efficiency.
1st plate replacement and 1st automatic plunket cleaning are prioritized.

! Figure 7ij is a flowchart of automatic blanket cleaning. After controlling the paper feeder and stopping one feeder, in response to the detection signal SD of the safety device,
After detecting the absence of one sheet during printing, and controlling the plunger DO to set the state of removing one sheet, the main motor M is rotated at low speed one time, and the cleaning machine Bw is activated to remove the blanket. Cleaning is performed, and then the main motor M is once stopped and then put into the 'slow NjJJ' state.

FIG. 8 is a flowchart for replacing the first plate. The main motor M is controlled to stop the plate cylinder 1tl at the first plate removal position shown in FIG. In response to the operation of the switch 1SW, the motor M is reversed once to remove the first plate, and then the plate cylinder 1 is stopped at the gripping position shown in Fig. 2 for the gripping and clamping operations. have them do it.

Then, in response to the switch ``SW operation'', ``forward rotation and board winding'' are performed, and the plate cylinder 1 is stopped at the 1-butt position shown in Fig. 3.
1, perform the butt attaching and butt tightening work, and turn switch 1.
In the case of a multi-color printing machine, complete one unit for each color according to the SW operation'? Repeat the steps from 'stop to the 1st plate removal position' until '' becomes YES.

Fig. 9 is a flowchart of ``Printing''. After controlling the main motor M to a 1-low speed state, the feeder is controlled to a 1-feeder operation state, and then to the original 1 printing operation. Transition.

FIG. 10 is a flowchart for manual one-blanket cleaning', in which the main motor M is controlled and the blanket cylinder 5 is slowly rotated in the one-slow movement state to perform one-blanket cleaning' manually. In the case of a color printing press, is one complete unit for each color completed? 1 blanket cleaning' is repeated until '' becomes YES, and then the process moves to the next step in response to the switch ``SW operation''.

The control circuit CNT shown in FIG. 4 may be used, for example, in the "Plate cylinder automatic stop device for sheet-fed rotary printing press" filed separately by the present applicant.
(% Application No. 57-214995), or it may be configured using a microprocessor, memory, etc., and perform control operations according to predetermined instructions. do it.

Therefore, in response to the operation of the switch SW, the plate cylinder 1 automatically stops at a predetermined position according to a predetermined order, thereby achieving labor-saving and safety in plate replacement and mounting work, and completely preventing damage to the printing press. can be prevented.

In addition, a series of operations, including cleaning the blanket cylinder 5, are automated, which prevents erroneous operations and makes operations easier.The time required from plate replacement or installation to the start of printing is shortened, and work efficiency is improved. improves.

For example, the selector SEL in FIG. 4 may be replaced with a decoder or the like, and if the counter CUT produces individual outputs for each count value, the selector SEL can be omitted and the control circuit Depending on the configuration of the CNT, it is possible to omit the pulse generation circuit PG, and the switch SW
It is also optional to provide each one individually according to each operation.

Furthermore, each of the stop positions shown in Figs. 1 to 3 may be determined according to the structure of the printing press, and the same effect can be achieved even if other stop positions are determined and the control status is determined accordingly. , in Figures 5 to 10, the steps are replaced depending on the situation,
Alternatively, various modifications are possible, such as omitting unnecessary steps.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, it is possible to realize labor saving and safety in plate replacement and mounting operations, and
The risk of damaging the printing press is completely eliminated, and a remarkable effect can be obtained in various sheet-fed rotary printing presses.

[Brief explanation of drawings]

1 to 3 are diagrams showing the plate exchange procedure, FIG. 4 and subsequent figures show embodiments of the present invention, and FIG. 4 is a block diagram of the control system,
5 and 6 are comprehensive flowcharts of the control situation, and FIGS. 7 to 10 are detailed flowcharts. RE・War・Encoder, CUT・Fist・Counter, C
NT-φe・Control circuit, SW・・・・Switch. Patent applicant Komori Printing Machinery Co., Ltd. Agent Masaki Yamakawa (and one other person) Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] an encoder that generates pulses according to the rotation of a plate cylinder connected to a rotating part of a sheet-fed rotary printing press, and a counter that sends out a count output according to the rotation angle of the plate cylinder by converting the pulses from l to L; An automatic plate cylinder stop device for a sheet-fed rotary printing press, comprising a control circuit that controls a stop position of the plate cylinder based on the count output.