JPS61192669A - Folding device of rotary press printer - Google Patents

Abstract

PURPOSE:To improve the accuracy of folding position of a sheet, by moisturing the sheet along the chopper folding position as well as making a line to fold at the position before the sheet is cut off, and folding along the line when the sheet is hit by the chopper blade. CONSTITUTION:A sheet 11 is delivered inside a folding device is moistured by a nozzle 38, and then a line to fold 32 is made in the moistured position by a knife 31. Delivered in this condition into a folding drum 12, folded into two sheets there, and the resultant folded sheet 23 is contacted to a stopper 26. When the folded sheet 23 contacts the stopper 26, a chopper blade 27 comes down and hits the sheet 23 to fold at the moistured portion, because the moistured portion has been softened and foldable easily. Furthermore, since the line to fold 32 has been made by the knife 31, the sheet is folded readily along the line, by a folding roller 28, and then discharged as a folded sheet 29. In such a way, the accuracy of the folding position of the sheet is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a folding device for a rotary printing press, and more particularly to a folding device that improves the accuracy of the folding position in chopper folding by %.

[Background of the invention]

In general, there are folding devices of a folding machine in an offset rotary press as shown in FIGS. 2 to 4. Figure 2 shows the configuration of a general offset rotary press. Paper 2 fed from an infeed 1 passes through multiple printing units 3, is printed on both sides simultaneously, passes through a drying device 4, and removes the solvent in the ink. The ink is evaporated and fixed on the paper 2 by the cooling roller 5, and then sent to the folding machine 6. There are various structures of the folding machine 6, but
Here, a case with a narrow paper bias as shown in FIG. 3 will be explained. The paper fed from the cooling device 7 at a predetermined feeding speed is
The paper 11 is pulled by a drag roller 8, passes through several guide rollers 9, and is bent by a turner 10 at right angles in the direction of travel of the paper 11.
send to. Before being fed into the folding dowel I2, the paper 11 is scored 32 with a knife 31. The paper 11 fed into the folding cylinder 12 is pierced by the needle 14 of the thrusting cylinder 13 and pulled, and the saw blade 16 of the cutter cylinder 15 cuts the paper 11 into a predetermined size. The paper 17 that has advanced while being wrapped around the outer peripheral surface of the thrust cylinder 13 is pushed into the gripping plate 19 of the gripping cylinder 18 at a fixed position. The mouth plate 19 is closed by the operation of a cam (not shown), and the paper 17 is sandwiched between the paper 17 and folded in half. The grip plate 19 is opened by the operation of the cam 18, and the paper is peeled off 22.
As a result, the paper 2 is lifted from the gripper cylinder 18, and the camellia is removed from the cylinder 18, and conveyed while being sandwiched between upper and lower tapes 24 and 25.

Thereafter, the paper 11 is fed into a chopper folding device that folds the paper in a direction perpendicular to the traveling direction of the paper 11. The conveyed signature 23 is stopped by the stopper 2
6. At this time, the chopper grade 27 descends, strikes the signature 23, and sends it to the rotationally driven folding roller 28, which folds the signature 23 in an angular direction with respect to the traveling direction and discharges it. However, the previous torso 18
Since the signatures 23 that are farther apart are conveyed while being held between only the tapes 24 and 25, they may be tilted with respect to the traveling direction during conveyance. For this reason, the folding roller 28 does not create a crease at the position fIL when folding the signature 23, causing bending or positional deviation, and variations and bends of about ±1 m in the folding position of the signature 29. Was.

[Object of the Invention] An object of the present invention is to provide a folding device for a rotary printing press that eliminates the above-mentioned drawbacks of the prior art and reduces variations in folding positions and bends.

[Overview of the invention]

In order to achieve the above object, in the present invention, before cutting the paper, water is supplied and humidified along the chopper folding position, and a line is made at the folding position so that when the paper is struck with a chopper grade, the paper will be folded from the line. It is characterized by the following.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIG.

Note that parts that are the same as those in the prior art are designated by the same reference numerals. FIG. 1 shows the state in which the sleeve 11 is connected before entering the folding drum 12. Reference numeral 33 denotes a storage tank for storing water and gold 34, which has a box-like shape and is open at the top. The bottom of this storage tank is connected via piping 35 to a valve 36 (manual or automatic). This valve 3
One end of 6 is connected to a nozzle 38 via a pipe 37.

The tip of the nozzle 38 is formed thin like a hypodermic needle, and the water flowing out from the tip draws a line on the paper 11 parallel to the traveling direction of the paper 11. Humidify. Further, the knife 31 is supported so as to be in contact with the crease line position with a predetermined pressure.

In the above configuration, the paper 11 fed into the folding device
After being humidified by a nozzle 38, a knife 31 is used to make streaks 32 on the humidified area. In this state, the signature 23 is fed into the folding cylinder 12 and folded in half, and is fed so as to come into contact with the stopper 26. When the signature 23 comes into contact with the stopper 26, the chopper grade 27 descends and the part of the signature 23 that has been humidified by the nozzle 38 is softened and becomes easier to fold. 23 is broken at the humidification position. Furthermore, at the humidification position,
Since the line 32 is made with the knife 31, the signature 2
3 is bent from the line 32 and sent to the folding roller 28. The signature 23 fed into the folding roller 28 is further folded and discharged as a signature 29.

As described above, by humidifying the paper 11 along the fold lines and making streaks, even if the fold book 23 for chopper folding is bent or misaligned, the fold position can be corrected. Since the folding accuracy is corrected, the folding accuracy can be improved to t±Q, 5 hta. This corresponds to the conventional accuracy number.

〔Effect of the invention〕

As described above, according to the present invention, there is an effect that the accuracy of the folding position of the signature can be improved.

[Brief explanation of the drawing]

Fig. 1 is a paper flow diagram of a folding machine showing the water supply device of the present invention, Fig. 2 is a configuration diagram of an offset rotary press, Fig. 3 is an overall view of the folding machine, and Fig. 4 is a paper flow diagram of a conventional folding machine. This is a flowchart. 31...knife, 32...stripes, 33.
...Storage tank, 34...Water, 35...Piping, 36...Valve, 37...Piping, 38.
··nozzle. Figure 1 Figure 2

Claims (1)

[Claims] After making a line parallel to the direction of paper travel at the folding position of the paper and cutting it to a predetermined length in the direction of paper travel, fold the paper in a direction perpendicular to the direction of travel of the paper, and then use chopper folding to advance the paper. A folding device for a rotary printing press configured to fold parallel to a direction, characterized in that a water supply means is provided for applying water to the paper along the chopper folding fold line before the paper is cut. Folding device for rotary printing presses.