JPH066137Y2 - Folding blade - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a folding blade applied to a folding cylinder of a folding section of a rotary printing press.

(Prior Art) FIG. 3 shows a portion around a folding cylinder in a conventional newspaper rotary printing press. The running paper (1) folded in two by a triangular plate (not shown) at the folding portion has a saw end first. It is cut between the saw blade (7) of the cylinder (2) and the saw blade receiver (6) of the folding cylinder (3). At the same time, the needle (5) of the needle device (4) attached to the folding cylinder (3) pierces the running paper (1). A wedge-shaped folding blade attached to the folding cylinder (3) at a position shifted by a set phase with respect to the needle device (4).
There is (8). Since the folding blade (8) rotates three times (rotates) while the folding cylinder (3) makes one rotation (revolution), the folding blade (8)
The locus of movement of the tip (9) of the becomes a curve (10). This curve (1
The folding blade (8) comes next to the saw blade near point A in (0)
The signature (11) cut by (7 ') is pushed between the pair of folding rollers (12).

The running paper (1) conveyed by the needles (5) runs along the outer periphery of the folding cylinder (3), but the running paper (1) has a specified length (folding cylinder (3)).
1/2 turn), the blade is cut by the saw blade (7 ′) and folded
It becomes (11). The needle (5) carrying the running paper (1) a little before this time starts to be pulled in, and after that, the needle (5) comes out of the signature (11). As shown in FIG. 5, the tip (9) of the folding blade (8) begins to come into contact with the folding tab (11) from a point B slightly before the point A, and the maximum margin is at the point A. (See Fig. 4) At this point A
Both ends (a) and (b) of (11) often flap as shown in FIG. The position of the folding blade (8) in motion near the point A on the locus (10) of the tip of the folding blade (8), that is, at the place where the folding tab (11) is pushed into the pair of folding rollers (12) ( The situation of the envelope (14) of the locus of the posture (13) between the locus (13) and the locus (10) of its tip is shown in FIG. As is clear from FIG. 5, the space (S) between the envelope (14) and the pair of folding rollers (12) is wide.

In the figure, (0) is the center of rotation of the folding blade (8).

[Problems to be Solved by the Invention] In the conventional device, the folding tab (11) has a folding blade (8).
When pushed into the pair of folding rollers (12), the space (S) between the envelope (14) of the trajectory of the movement of the wedge-shaped folding blade (8) and the pair of folding rollers (12) is large. In particular, when the folding blade (8) reaches the maximum margin as shown in FIG. 4, the flap (11) has a large flutter, and the flap (11) causes the edge of the paper to be broken or torn. If the edge is broken or torn, the product value will be reduced, or the product will be defective, and defects such as increased waste paper will occur.

(Means for Solving Problems) The present invention has been proposed to solve such problems, in which printed and stacked strip-shaped running papers are folded in two by a triangular plate, When a folding tab is cut between the folding cylinders, the blades of the folding portion in the rotary printing press configured to push the folding tab into the pair of folding rollers and further fold the blades are orthogonal to the longitudinal direction. The present invention relates to a folding blade, wherein the outer shape of the cross section is formed into a substantially V shape having a concave portion.

(Operation) As described above, the folding blade according to the present invention is formed such that the outer shape of the cross section orthogonal to the longitudinal direction thereof is a substantially V shape having a concave portion, and therefore the posture and the envelope of the movement locus thereof. Means that the space between the pair of folding rollers is extremely narrowed to prevent the flaps from fluttering.

(Embodiment) The present invention will be described below with reference to the illustrated embodiment.

As shown in FIG. 1, the folding blade (21) is attached to the folding cylinder (3) shown in FIG. 3 in place of the conventional folding blade (8). The tip of the folding blade (21) is formed by a pair of curved portions (22) as shown in FIG. 2 so that the folding blade (21) does not contact the pair of folding rollers (12) during movement. (twenty one)
The overall shape of the is V-shaped. The posture (25) and the outer envelope (26) drawn by the V-shaped folding blade (21) are as shown in FIG. 2, and this envelope (26) and the pair of folding rollers (12). The space between () and () is very narrow.

The folding blade (21) is attached to the shaft (24), and the folding cylinder (3) makes three revolutions together with the shaft (24) in the same manner as the conventional folding blade (8). Tip of (21) (27)
Draws a curve (10 ') similar to the curve (10) in FIG. In the figure
(0 ') is the center of rotation of the folding blade (21).

(Effects of the Invention) As described above, according to the present invention, since the folding blade is formed in a substantially V shape having a concave portion in the cross section orthogonal to its longitudinal direction, its posture and its movement locus are The envelope is a very narrow space between the pair of folding rollers, and when the signature is folded by the pair of folding rollers, the flaps do not flap and the edges of the signature do not break or tear. Have an effect.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a folding blade according to the present invention, FIG. 2 is an explanatory view showing a motion locus of the folding blade and its envelope, and FIG. 3 is a conventional newspaper rotary printing press. FIG. 4 is a vertical cross-sectional view showing a portion around the folding cylinder, FIG. 4 is a vertical cross-sectional view showing a state of a folding blade when the conventional folding blade has the maximum margin, and FIG. It is explanatory drawing which shows an envelope. (12) …… folding roller, (21) …… folding blade (25) …… folding blade movement trajectory, (26) …… envelope (P) …… folding blade movement trajectory envelope and folding roller Space between

Claims (1)

[Scope of utility model registration request] 1. When a printed and running strip-shaped running paper is folded in two by a triangular plate and cut into a folding tab between the saw cylinder and the folding cylinder, the folding tab is pushed into a pair of folding rollers. Further, the blade of the folding portion in the rotary printing press configured to be folded in two is formed into a substantially V shape having a concave portion in the outer shape of the cross section orthogonal to the longitudinal direction thereof.