JPH0627128U - Slotter groove cutting tool - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a corrugated board sheet that enables the assembly of a box with high dimensional accuracy. [Structure] A groove cutting tool 20 attached to a tool rest 12,
The cutting blades 22 and 33 of 30 are V-shaped. The groove cutting blades 20 and 30 form a kerf having a V-shaped closed edge, and the ruled line is bent at the apex of the V-shaped closed edge.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a grooving blade of a slotter for forming a kerf on a side edge portion of a sheet such as a rectangular corrugated board sheet.

[0002]

[Prior art]

 As shown in FIG. 3A, a plurality of ruled lines 2 are provided in parallel in one direction on a corrugated board sheet 1 manufactured by a corrugator. Such a corrugated cardboard sheet 1 is usually subjected to appropriate printing, and then, as shown in FIG. 3 (b), a ruled line 3 and a kerf 4 are formed to form a corrugated cardboard box material.

A scorer is used to form the ruled lines 3, while a slotter is used to form the kerfs 4. The scorer and the slotter are provided in order on the corrugated cardboard sheet transfer path, and when the scorer inserts the ruled lines 3 into the corrugated cardboard sheet, the slotter forms kerfs 4 at both ends of the ruled line.

4 and 5 show a conventionally known slotter. In this slotter, circular tool rests 12 and 13 are attached to rotating shafts 10 and 11 arranged vertically, respectively, and a front groove cutting tool 14 and a rear groove cutting tool 15 are circumferentially required on the upper tool rest 12. The cutting blades 16 are formed at intervals of the above, the cutting blade 16 is formed on the trailing side in the rotational direction of the front groove cutting blade 14, and the cutting blade 17 is provided on the leading side in the rotational direction of the rear groove cutting blade 15.

Further, a tool fitting groove 18 is formed on the outer periphery of the lower tool rest 13 so that the outer peripheral portions of the respective groove cutting tools 14, 15 can be fitted, and the opening edge of the tool fitting groove 18 is received by the receiving blade 19. The receiving blade 19 and the groove cutting tools 14 and 15 form cutting grooves on the leading side and the trailing side of the corrugated board sheet 1 fed between the pair of tool rests 12 and 13.

[0006]

[Problems to be solved by the device]

 By the way, in the conventional groove cutting tools 14 and 15, as shown in FIG. 6, the cutting blades 16 of the front groove cutting tool 14 and the cutting blades 17 of the rear groove cutting tool 15 are located on both sides of the respective groove cutting tools 14 and 15. Since it has a linear shape orthogonal to the cutting blades 14a and 15a, the closed edge 5 of the kerf 4 formed by the groove cutting tools 14 and 15 is parallel to the side edge of the corrugated board sheet 1 as shown in FIG. However, the following problems occur.

That is, the ruled line 3 formed between the kerf 4 on one side of the corrugated board sheet 1 and the kerf 4 on the other side has different width dimensions depending on the thickness of the corrugated board sheet 1, but as shown in FIG. When the corrugated cardboard sheet 1 has a required width dimension and is folded along the ruled line 3, the folding position at the closed edge 5 of the kerf 4 is not fixed, and the folding line is inclined, so that a box without distortion is formed. There is a problem that cannot be assembled.

This problem is particularly noticeable when the corrugated sheet corrugations are parallel to the ruled lines 3.

The present invention has a technical problem to solve the above problems and to assemble a box with high dimensional accuracy so that the ruled lines can be bent accurately.

[0010]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention adopts a configuration in which the cutting blade of the groove cutting tool attached to the tool rest is V-shaped.

[0011]

[Action]

 As described above, by forming the kerf on the sheet by using the V-shaped cutting blade of the grooving blade, the closed edge of the kerf is V-shaped. Therefore, when a sheet with a kerf is bent along a ruled line, the folding position of the ruled line becomes a V-shaped apex at the closed edge of the kerf, and the sheet is cut along that line from the apex. Can be folded.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. In the embodiment, the overall structure of the slotter is omitted because it is the same as that shown in FIG.

FIG. 1A shows a front groove cutting tool attached to the tool rest 12 of FIG. The front groove cutting tool 20 has a fan shape, and both side edges of the outer diameter surface thereof form a pair of cutting blades 21. A cutting blade 22 protruding in the outer diameter direction of the front groove cutting tool 20 is formed at an end portion between the pair of cutting blades 21, and the cutting blade 22 is V-shaped.

Further, a plurality of elongated holes 23 are formed in the inner diameter portion of the front groove-cutting tool 20, and the front groove-cutting tool 20 is fixed to the tool rest 12 by tightening bolts inserted into the elongated holes 23. . In this case, the front groove cutting tool 20 is attached so that the cutting blade 22 is located at the rear part in the rotational direction.

FIG. 1B shows a rear groove cutting tool. The rear grooving blade 30 is fan-shaped like the front grooving blade 20, and has a pair of cutting blades 31 on both sides of its outer diameter surface. Further, a projecting portion 32 is provided at an end portion between the pair of cutting blades 31, an edge of the projecting portion 32 is a cutting blade 33, and the cutting blade 33 is V-shaped.

The rear groove cutting tool 30 is attached to the tool rest 12 shown in FIG. 4 by tightening bolts. For this reason, a plurality of elongated holes 34 for inserting bolts are provided in the inner diameter portion of the rear groove cutting tool 30 at required intervals in the circumferential direction.

Here, when attaching the rear groove cutting tool 30, the cutting tool 33 is mounted so as to be located on the front side in the rotation direction.

Now, the front groove cutting tool 20 and the rear groove cutting tool 30 are attached to the tool tool 12 shown in FIG. 4, and the tool tool 12 and the lower tool tool 13 are rotated in opposite directions to each other, When the corrugated board sheet 1 shown in FIG. 3A is supplied between the stands 12 and 13, the leading side of the corrugated board sheet 1 is cut by the front groove cutting tool 20, and the trailing side is cut by the rear groove cutting tool 30. Are cut by the above-mentioned method to form kerfs on the leading side and the trailing side.

At this time, the cutting blades 22 on the trailing side in the rotation direction of the front groove cutting tool 20 and the cutting blades 33 on the leading side in the rotation direction of the rear groove cutting tool 30 are each V-shaped, so that FIG. As shown, the closed edge 5 of the kerf 4 formed in the corrugated board sheet 1 is V-shaped. Therefore, when the corrugated board sheet 1 is folded along the pre-formed ruled line 3, both ends of the ruled line 3 are bent starting from the apex a of the closed edge 5, and the corrugated board is drawn along a straight line connecting the apex a. Sheet 1 can be folded. Therefore, the corrugated board sheet 1 can be bent with extremely high accuracy, and a box with high dimensional accuracy can be assembled.

Depending on the shape of the box, the kerf 4 may be formed by only one of the front groove cutting tool 20 and the rear groove cutting tool 30.

[0021]

[Effect of device]

 As described above, in the groove cutting tool according to the present invention, since the cutting blade of the groove cutting tool is V-shaped, the closed edge of the cutting groove formed by the groove cutting tool can be V-shaped. Therefore, when the sheet is bent along the ruled line, the bending position of the end of the ruled line can be specified at the apex of the V-shaped closed edge of the kerf, and a box with high dimensional accuracy can be assembled.

[Brief description of drawings]

1 shows a groove cutting tool according to the present invention, (a) is a perspective view of a front groove cutting blade, (b) is a perspective view of a rear groove cutting blade

FIG. 2 is a front view showing a part of a corrugated cardboard sheet in which a kerf is formed by using the groove cutting tool shown in FIG.

FIG. 3A is a front view of a corrugated cardboard sheet formed by a corrugator, and FIG. 3B is a front view of a corrugated cardboard sheet subjected to scoring and kerf processing.

[Figure 4] Front view of slotter

FIG. 5 is a side view of the above.

6A and 6B are perspective views showing a conventional groove cutting tool.

FIG. 7 is an enlarged view of a kerf formed by a conventional grooving tool.

[Explanation of symbols]

 12, 13 Turret 18 Blade fitting groove 19 Receiving blade 20 Front groove cutting blade 22 Cutting blade 30 Rear groove cutting blade 33 Cutting blade

Claims (1)

[Scope of utility model registration request] 1. A pair of upper and lower turrets, wherein one of the turrets is provided with a grooving cutter having a pair of cutting edges on both sides of the outer diameter surface, and the other turret has an opening edge on the outer periphery thereof. In a slotter that forms a tool fitting groove to and that forms a kerf in a sheet fed between the turrets by rotating the pair of turrets in mutually opposite directions, a pair of cutting blades of the groove cutting tool A slotter groove cutting tool having a V-shaped cutting blade provided at the end.