JP2579290B2 - Sewing cylinder for rotary printing press - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sewing machine cylinder used for a folding machine of a rotary printing press.

[Conventional technology]

In a folding machine of a rotary printing press, a printing paper is folded a plurality of times in a vertical direction and a horizontal direction with respect to a traveling direction to form a signature of 8 to 64 pages. Fig. 6 shows an example of a signature folded by a folding machine, where 1 indicates the signature, 1A indicates the first fold, 1B indicates the second fold, and 1C indicates the third fold. .

[Problems to be solved by the invention]

However, the signature 1 folded in the conventional folding machine has a problem that the crease 2 is generated in the underruled bag.

The present inventors have conducted intensive studies to prevent the occurrence of wrinkles and found that it is effective to slightly cut the crease at the position of the fold 1C before forming the fold 1C. Was.

By the way, in order to cut under the crease at the position of the fold 1C, it is considered that a single-blade slitter with the same cylinder circumference that synchronizes with the printing cylinder circumference should be arranged in the printing flow direction. The problem is that the folding machine becomes large and the drive system becomes complicated.

[Means for solving the problem]

The inventor of the present invention has conducted extensive studies on a method of cutting the crease at the position of the fold 1C without increasing the size and complexity of the folding machine. A perforation cylinder for perforating the direction is arranged,
It has been found that by providing an auxiliary blade on the sewing machine cylinder, it is possible to cut under the crease at the position of the fold 1C.

The present invention has been made based on such knowledge, and is directed to a sewing machine cylinder provided with a sewing machine blade provided in a folding machine of a rotary printing press and forming a perforation in a lateral direction with respect to a running printing paper. The gist of the present invention is a sewing machine cylinder of a rotary printing press, wherein an auxiliary blade substantially perpendicular to the sewing machine is attached to the sewing machine blade.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 3 is a schematic side view showing a folding machine equipped with a sewing machine cylinder according to an embodiment of the present invention, 3 is printing paper continuously fed from the printing press, 4 is a drag roller, and 5 is printing paper 3. Former for folding vertically, 6 for folding roller, 7 for printing paper 3
This is a machine cylinder for making vertical cuts or perforations in the machine. Reference numeral 8 denotes a sewing machine cylinder according to an embodiment of the present invention, which will be described later in detail. 9 is a feed roller, 10 is a folding cylinder, 11 is a saw cylinder, 12
The holding cylinder, 13 and 14 are transport belts, 15 is a chopper, 16 is a nip roller, 17 is an impeller, and 18 is a delivery device.
Except for the structure of the sewing machine cylinder 8, it is a known one.
Detailed description is omitted.

As shown in FIG. 1, the sewing machine cylinder 8 includes a sewing machine blade 21 that is transverse to the print flow direction indicated by the arrow A.
An auxiliary blade 22 perpendicular to the sewing machine blade 21 is fixed to the center of the sewing machine blade 21 by welding or the like as shown in an enlarged view in FIG. The mounting position of this auxiliary blade 22 is
Is determined so as to coincide with the fold position when folded in a later step. In FIG. 1, reference numeral 23 denotes a receiving cylinder, which is provided with a receiving stand (not shown) for receiving perforations and cuts in the printing paper 3 by receiving the sewing blade 21 and the auxiliary blade 22.

Next, the operation of the folding machine provided with the sewing machine cylinder 8 will be described.

The printing paper 3 supplied from the printing press is vertically folded in two by a former 5 and a folding roller 6, and
As shown in FIG. 1, the sheet is sent between the perforating cylinder 8 and the receiving cylinder 23 as slits or perforations are formed in the vertical direction as necessary. In FIG. 1, 3A is a fold formed by the former 5. The perforation cylinder 8 forms a horizontal perforation 25 and a small vertical slit 26 on the printing paper 3. Thereafter, the printing paper 3 is held by the folding cylinder 10, cut to a predetermined length by the saw cylinder 11, and folded by the gripping cylinder 12 at the horizontal perforation 25 as a fold 3 B, as shown in FIG. State.

Thereafter, the printing paper 3 shown in FIG. 4 is folded by the chopper 15 and the nip roller 16 into a fold 3C perpendicular to the fold 3B as shown in FIG. The fold 3C at this time is a position corresponding to the slit 26 formed by the sewing machine cylinder 8. In this way, at the crease position of crease 3C,
Before the fold 3C is folded, the slit 26 is formed in advance, so that the occurrence of bag wrinkling at the time of folding is prevented. The folded printing paper or signature 3 is then discharged by the rotating wheel 17 and the delivery device 18.

In the above embodiment, the auxiliary blade 22 is fixed to the sewing machine blade 21 of the sewing machine cylinder 8 so as to extend to both sides, and a cross-shaped slit is formed in the printing paper 3. It is not necessary to provide the slits 26 on both sides of the perforation 25, and a structure may be employed in which the slits 26 can be formed only in the portions that are inside when folded as shown in FIG. When slitting the printing paper 3 with the auxiliary blade 22, burrs may appear on the side opposite to the surface that hits the auxiliary blade 22, and if this burr comes out on the outer side of the signature, it may cause trouble in the post-process. Therefore, it is preferable to form the slit 26 only in the inner portion. In this case, the auxiliary blade 22 is provided on only one side of the sewing blade 21.

Further, in addition to the center auxiliary blade 22, a similar auxiliary blade may be appropriately provided on the sewing machine blade 21, and a vertical slit may be formed in a lower portion of the crease except for the fold. When such a slit is formed, bag wrinkling can be further prevented.

〔The invention's effect〕

As is apparent from the above description, the sewing machine cylinder according to the present invention has a simple structure in which a sewing blade that forms a perforation in the horizontal direction with respect to the printing paper and an auxiliary blade that is substantially perpendicular to the sewing machine are attached. A slit can be formed in a portion of the crease of the creased lower bag, which has the effect of preventing wrinkling of the signature.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a sewing machine cylinder according to an embodiment of the present invention and the vicinity thereof, FIG. 2 is an enlarged perspective view showing a sewing blade and an auxiliary blade used for the sewing machine cylinder, and FIG. 4 and 5 are perspective views showing printed paper folded by the above-mentioned folding machine, and FIG. 6 is a perspective view showing a signature folded by a conventional folding machine. . 3 ... printing paper, 3A, 3B, 3C ... fold 5 ... former, 6 ... folding roller, 7 ... sewing machine cylinder 8 ... sewing machine cylinder, 9 ... feed roller, 10 ... folding cylinder 11 ... ... Saw cylinder, 12 ... Holding cylinder, 15 ... Chopper 21 ... Perforated blade, 22 ... Auxiliary blade, 23 ... Receiver cylinder 25 ... Perforated line, 26 ... Slit

Claims (1)

(57) [Claims] 1. A sewing machine cylinder provided on a folding machine of a rotary printing press and having a sewing blade for forming a perforation in a lateral direction with respect to a running printing paper, wherein an auxiliary blade in a direction substantially perpendicular to the sewing blade is provided. A rotary printing press sewing machine cylinder characterized by being attached.