JP2000062048A - Method for preventing corrugated fiberboard band in trimming process from meandering - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for preventing a corrugated fiberboard band in a trimming process from meandering. SOLUTION: On the upstream side of the pass line of a slitter, a pair of rotary shafts 7, which are normal to the running direction of the pass line and pinch the pass line vertically in parallel, are provided. On the respective rotary shafts 7, holding-down rollers 8 and 9 are mounted so as to match at both of the end edges of a corrugated fiberboard band 1 in order to press and confine both of the end edges to be trimmed of the corrugated fiberboard band 1, resulting in preventing the running corrugated fiberboard band 1 from meandering.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a meandering prevention method for corrugated cardboard strips in a trimming process.

[0002]

2. Description of the Related Art Corrugated cardboard strips continuously manufactured by a corrugating machine are trimmed at both end edges in accordance with the finished size of the corrugated cardboard sheet in order to make the widths uniform. Usually, this trimming is carried out at the same time as the slitting for cutting the corrugated cardboard strip into a required width by using a slitter arranged near the end of the corrugator line. The trimmed edge is separated and removed from the corrugated cardboard strip by suction means or the like.

In the trimming step, the corrugated cardboard strip running on the pass line meanders in the width direction, the slitter knife for trimming is dislocated from the width edge of the corrugated cardboard strip, or the trimming margin becomes too narrow, resulting in shearing by the slitter knife. There may be uncertainty. To solve this problem, the width of the corrugated cardboard strip manufactured by a corrugated machine has conventionally been set to be considerably wider than the required product width in consideration of the minimum trimming margin required for shearing with a slitter knife and the meandering amount of the corrugated cardboard strip. Therefore, there is a problem that a high yield cannot be secured.

Therefore, an object of the present invention is to provide a method for preventing meandering of a corrugated cardboard strip in a trimming process.

[0005]

In order to solve the above-mentioned problems, the method of preventing meandering of a corrugated cardboard strip according to the present invention includes a step of trimming both end edges of a corrugated cardboard strip running on a pass line with a slitter knife. The upstream side of the pass line adjacent to the slitter knife is provided with a pair of rotary shafts that are orthogonal to the traveling direction of the pass line and sandwich the pass line in parallel from above and below, and at least one of both end portions of the corrugated cardboard strip. A pressing roller is attached to each of the rotating shafts so as to match the position in the width direction of (1), and at least one of the edges of the corrugated cardboard strip to be trimmed is pressed by the pressing roller from above and below.

That is, a pressing roller is arranged on the upstream side of the slitter knife, and the edge of the corrugated cardboard strip trimmed by the pressing roller is pressed and restrained to prevent the corrugated cardboard band from meandering. Since the edge of the corrugated cardboard strip that is pressed and deformed by the pressing roller is originally cut off, it is irrelevant to the decrease in yield.

Further, in a line in which a scorer is arranged close to the upstream side of the slitter knife, the rotation shafts of the scorer are used as the pair of rotation shafts, and the pressing rollers are attached to the respective rotation shafts of the scorer. It is possible to use a ruled line roller formed so as to be fixed at the axial position of.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 to 3 show a slitter portion on which a corrugated cardboard strip 1 is trimmed by carrying out the meandering prevention method of the present invention. 1 is a side view of the slitter portion, FIG. 2 is a plan view thereof, and FIG. 3 is a front view thereof. This slitter part includes a slitter 4 in which a rotary shaft 3 having a slitter knife 2 is vertically arranged with a pass line along which the corrugated cardboard strip 1 travels, and an edge which is arranged close to the slitter 4 on the upstream side of the pass line. It is composed of a member pressing device 5 and a trim duct 6 arranged on the downstream side of the slitter 4.

The edge pressing device 5 has a pair of rotary shafts 7 which are orthogonal to the traveling direction of the pass line indicated by an arrow in FIG.
The pressing roller 8 having a convex tip shape and the pressing roller 9 having a concave tip shape are mounted on the lower rotary shaft 7 so as to face each other. The pressing rollers 8 and 9 are
The cardboard strips 1 are fixed by aligning axially with both ends of the cardboard strip 1 and pressing and restraining the cardboard strip 1 from above and below,
Rotating while preventing meandering in the width direction. Both edge portions of the corrugated cardboard strip 1 pressed by the pressing rollers 8 and 9 are crushed and deformed, but they are separated and removed by the slitter knife 2 described later and do not become a product, so there is no problem.

Although not shown, the upper and lower rotary shafts 7 are vertically separated by a lifting device when the width of the corrugated cardboard strip 1 is changed, and the pressing rollers 8 and 9 of the upper and lower rotary shafts 7 are separated at this separated position. It is slid in the axial direction so that the mounting position can be changed in accordance with both edge portions of the new corrugated cardboard strip 1.

The slitter knife 2 is mounted on the upper and lower rotating shafts 3 in four pairs in order to cut the corrugated cardboard strip 1 into three strips having a required width. Two pairs on the center side are used for slitting, and two pairs on both ends are formed. Pairs are used for edge trimming. Both edge portions of the corrugated cardboard strip 1 pressed and deformed by the pressing rollers 8 and 9 are separated from the corrugated cardboard strip 1 by the slitter knives 2 on both ends and sucked and removed by the trim duct 6.

FIGS. 4 and 5 show a slitter / scorer portion of a corrugator line to which the meandering prevention method of the present invention is applied. In this line, on the upstream side of the slitter 10,
A slitter / scorer device 13 in which a scorer 12 for applying a ruled line processing to a corrugated cardboard strip 11 is arranged in proximity to the corrugated cardboard strip 1
Two units are arranged along one pass line. A trim duct 14 is installed on the downstream side of each slitter / scorer device 13.

The slitter 10 and the scorer 12 of each slitter-scorer device 13 are housed in the same casing 15, and the upper and lower rotary shafts 17 of the slitter 10 to which the slitter knife 16 is attached and the scorer to which the ruled line roller 18 is attached. Although not shown, the upper and lower rotary shafts 19 of the 12 are rotationally driven at a constant speed by a common drive device, and are vertically separable by an elevating device. The two slitters
The scorer devices 13 are alternately operated one by one according to lot change, etc., and in FIG. 4, the upstream slitter / scorer device 13 is in operation, and the rotating shafts 17 of the dormant downstream slitter / scorer device 13 are in operation. , 19 are vertically separated.

As shown in FIG. 5, three pairs of slitter knives 16 are attached to the upstream side slitter 10 in operation. The central slitter knife 16 cuts the corrugated cardboard strip 11 into two equal parts, and both sides of the stripper knife 11 are cut. The slitter knife 16 trims both edges of the corrugated cardboard strip 11. Similarly, the upstream side scorer 12 has four pairs of ruled line rollers 18 in which two ruled lines 20 are inserted for each line of the corrugated cardboard strip 11 to be cut.
a and two pairs of ruled line rollers 18b for pressing and restraining both end portions of the corrugated cardboard strip 11 from above and below to prevent meandering.
Is installed.

The both end edges of the corrugated cardboard strip 11 which has been ruled by being pressed from above and below by the ruled line rollers 18b are
As in the above embodiment, the slitter knives 16 on both sides separate the corrugated cardboard strip 11 from the corrugated cardboard strip 11, and the trim duct 14 sucks and removes the corrugated strip 11.

In each of the above-mentioned embodiments, both edges of the corrugated cardboard strip to be trimmed are pressed by the pressing roller and the ruled line roller, but a method of pressing only one of the edges may be adopted.

[0017]

As described above, according to the method for preventing meandering of the corrugated cardboard strip of the present invention, the pressing roller is disposed in the vicinity of the slitter knife for trimming the corrugated cardboard strip, and the corrugated cardboard strip trimmed and cut off by the pressing roller is disposed. Since the edge portion is pressed and restrained, meandering of the corrugated cardboard strip can be effectively prevented without increasing the excess cut amount, and the trimming margin can be reduced to improve the yield. Further, in the line where the scorer is arranged close to the upstream side of the slitter, the meandering prevention method of the present invention can be applied to existing equipment by utilizing the ruler roller of the scorer as the pressing roller.

[Brief description of drawings]

FIG. 1 is a side view of a slitter part in which a meandering prevention method of the present invention is implemented.

FIG. 2 is a plan view of FIG.

3 is a front view of FIG.

FIG. 4 is a side view of a slitter / scorer unit to which the meandering prevention method of the present invention is applied.

FIG. 5 is a partially omitted plan view of FIG.

[Explanation of symbols]

1 Cardboard strip 2 slitter knife 3 rotation axes 4 slitters 5 Edge holding device 6 trim duct 7 rotation axis 8, 9 Pressing roller 10 slitters 11 Cardboard strip 12 scorers 13 Slitter scorer device 14 Trim duct 15 casing 16 slitter knife 17 rotation axis 18, 18a, 18b Ruled line roller 19 rotation axis 20 ruled lines

Claims (2)

[Claims] 1. In the step of trimming both edge portions of a corrugated cardboard strip traveling on a pass line with a slitter knife, the pass line adjacent to the slitter knife is provided upstream of the pass line, at a right angle to the advancing direction of the pass line. A pair of rotary shafts that sandwich the line from above and below are provided in parallel, the widthwise position of at least one of both end portions of the corrugated cardboard strip is matched, and a pressing roller is attached to each rotary shaft, and the corrugated cardboard is trimmed. A method for preventing meandering of a corrugated cardboard strip in a trimming step, characterized in that at least one edge of the strip is pressed from above and below by the pressing roller. 2. The pair of rotary shafts are rotary shafts of a scorer arranged close to a path line upstream of the slitter knife, and the pressing roller is attached to each rotary shaft of the scorer, and an arbitrary shaft is provided. The corrugated board belt meandering prevention method in the trimming process according to claim 1, wherein the ruled line roller is formed so as to be fixed at a directional position.