JPH11262899A - Rotary die cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a rotary die cutter in a stable cutting condition, if operated for a long time. SOLUTION: A rotary die cutter includes a frame 1 for rotatably supporting a die cut cylinder 20 and an anvil cylinder 21 via respective bearings 22, wherein oil is circulated into the die cut cylinder 20 and/or the anvil cylinder 21, thereby to uniform the temperature of the respective cylinders 20, 21. The oil is lubricating oil 9 for gears 6, 7 to drive the first and second cylinders 20. 21, the lubricating oil 9 being scattered by the gears 6, 7 to be splashed on the frame 1. In this way, the temperature of the cylinders 20, 21 and the frame 1 is uniformed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary die cutter for punching a corrugated cardboard sheet or the like.

[0002]

2. Description of the Related Art Rotary die cutters of this type include:
For example, those shown in FIGS. 2 to 4 are known. In FIG. 2, frames 1 are erected in parallel on both left and right sides.
The anvil cylinder 4 is rotatably supported by a bearing 5.

The die cut cylinder 3 has a cylindrical outer peripheral surface, and a support shaft 3a is coaxially provided at both ends. Each support shaft 3a is rotatably supported by the frame 1 via the bearing 5 described above. Similarly, the anvil cylinder 4 also has a cylindrical outer peripheral surface, and a support shaft 4a is coaxially provided at both ends.
Each support shaft 4a is rotatably supported by the frame 1 via the bearing 5 described above.

A gear 6 for rotating the die-cut cylinder 3 is provided at a portion where each support shaft 3a protrudes from the frame 1, and each support shaft 4a protrudes from the frame 1 at a portion where the support shaft 4a protrudes from the frame 1. Is provided with a gear 7 for rotationally driving the anvil cylinder 4. These gears 6, 7 are in mesh with each other.

[0005] Each frame 1 is provided with a side cover 8 that covers the gears 6 and 7. In the side lid 8, portions below the gears 6 and 7 (portions below the bearings 5) are oil reservoirs 8a for storing lubricating oil. The lubricating oil stored in the oil reservoir 8a adheres to a gear 10 rotatably supported by the frame 1, and further adheres to a gear 7 with which the gear 10 meshes, so that the gear 7 and the gear 6 are lubricated. It has become. The bearing 5 is lubricated by grease sealed therein.

[0006] As shown in FIG.
The driving gear is rotatably driven from, for example, a printing unit (not shown) on the upstream side by a connecting gear 13 meshing with the gear 6, and is transmitted to a further downstream unit (not shown) by a connecting gear 14 meshing with the gear 6. Has become.

FIGS. 2 and 3 show the die cut cylinder 3.
As shown in FIG. 1, a punching die 11 is attached, and the punching die 11 is provided with a knife 11a. Knife 1
1a sandwiches the corrugated cardboard sheet 12 between the knife 11a and the surface of the anvil cylinder 4, and
2 is performed.

As a rotary die cutter, a knife 11 is used.
A cutting method called a soft cut using a saw blade knife as a and a rubber anvil as the anvil cylinder 4, and a cutting method called a hard cut using a straight blade as the knife 11a and a metal anvil as the anvil cylinder 4 There are things.

In the latter hard cut, the cutting is performed by pressing the hard knife 11a and the hard anvil cylinder 4, so that the pressing amount, in other words, the axial distance between the die cut cylinder 3 and the anvil cylinder 4 is precisely determined. (Usually strictly maintaining the accuracy in units of 1/100 mm). If such an inter-axis distance is not maintained, the corrugated cardboard sheet 12 may be left uncut, or the cutting edge of the knife 11a may be crushed by excessive pressure.

[0010]

However, in the above rotary die cutter, each bearing 5 generates heat by the rotation of the die cut cylinder 3 and the anvil cylinder 4, and a part of this heat is transmitted to the frame 1, and The temperature will rise. For this reason, the frame 1 is expanded by thermal expansion, and the die cut cylinder 3 and the anvil cylinder 4
The distance between the respective support shaft portions 3a, 4a is increased.

A part of the heat is transferred to each of the support shafts 3a, 4a,
Since the power is transmitted to the die-cut cylinder 3 and the anvil cylinder 4 via a, the temperatures of these cylinders 3 and 4 also increase. At this time, each support shaft 3a,
After the temperature of the cylinder 4a first increases, the temperature gradually increases from both ends of the cylinders 3 and 4 toward the center. That is, in each of the cylinders 3 and 4, a temperature gradient is generated from both ends to the center. Then, as shown by a dashed line in FIG. 2, each of the cylinders 3 and 4 is thermally deformed in a drum shape. As a result, the distance between the knife 11a and the anvil cylinder 4 is reduced at both ends of each of the cylinders 3 and 4, so that
In the central part of 4, the distance between the knife 11a and the anvil cylinder 4 is widened, which causes uneven cutting conditions in the width direction.

Further, the frame 1 and the cylinders 3, 4
Are not the same, the amount of change in the distance between the axes of the cylinders 3 and 4 caused by the thermal expansion of the frame 1 and the amount of change in the outer diameter due to the thermal expansion of the cylinders 3 and 4 (in the width direction) Average).
For this reason, as the operation time elapses, the pressing pressure (average in the width direction) between the knife 11a and the anvil cylinder 4 changes, which also causes uneven cutting conditions.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a rotary die cutter capable of maintaining a stable cutting state even after a long operation.

[0014]

In order to solve the above problems, the present invention relates to a rotary die cutter having a frame for rotatably supporting a die cut cylinder and an anvil cylinder via respective bearings. And / or in each of the anvil cylinders, oil is circulated.

Further, the present invention is characterized in that, in the above invention, lubricating oil for a gear driving each cylinder is used as the oil, and the lubricating oil is scattered by the gear and applied to the frame. .

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on examples with reference to FIG. However, components common to those of the conventional example shown in FIGS. 2 to 4 are denoted by the same reference numerals, and description thereof will be simplified. The rotary die cutter shown in this embodiment includes a frame 1 that rotatably supports a die cut cylinder 20 and an anvil cylinder 21 via bearings 22, respectively.
Inside, the oil is circulated. Then, the oil is supplied to the die cut cylinder 20.
And lubricating oil 9 for the gears 6 and 7 for driving the anvil cylinder 21. The lubricating oil 9 is scattered by the gears 6 and 7 and is applied to the frame 1.

Hereinafter, the above configuration will be described in more detail. That is, the frame 1 includes the cylinders 20, 21
Are arranged at both ends, and support the support shaft portions 202 of the cylinders 20 and 21 via bearings 22 so as to be rotatable. The frame 1 is provided with a side cover 8 that covers the periphery of each of the gears 6 and 7 so as to seal it. This side cover 8 is provided below the gears 6 and 7 (each bearing 2).
2) is an oil reservoir 8 a for storing the lubricating oil 9. The lubricating oil 9 stored in the oil reservoir 8a
Is attached to a gear 10 rotatably supported by the frame 1, and further attached to a gear 7 with which the gear 10 meshes, to lubricate the gear 7 and the gear 6.

The inside of the die cut cylinder 20 is formed hollow by a cylindrical member 201. Although FIG. 1 shows only the die-cut cylinder 20 in a cross-sectional view, the anvil cylinder 21 is configured in exactly the same manner, and a description of the anvil cylinder 21 will be omitted. In the cylindrical member 201, a partition plate 23 is provided at a central portion in the axial direction, and a supply pipe 25 is provided along the axial direction. Supply pipe 25
Is provided so as to reach the partition plate 23 from one end side of the cylindrical member 201, and is also provided so as to reach the partition plate 23 from the other end side of the cylindrical member 201. The supply pipes 25 are the same, and the structure around one end of the cylindrical member 201 is the same as that of the cylindrical member 2.
01 is the same as the structure around the other end of the cylindrical member 2.
The description of only the half from the center to the one end of 01 will replace the description of the overall configuration of the rotary die cutter.

The supply pipe 25 is provided with a flange 24 near one end thereof, and is rotatably supported on the inner surface of the support shaft 202 via a bearing 26 fitted on the outer periphery of the flange 24. The other end is rotatably supported on the inner surface of the central hole of the partition plate 23 via a bearing 27. The support shaft portion 202 is formed in a cylindrical shape, and a portion on one end side protrudes from the frame 1 into the side cover 8 via the bearing 22.

Further, one end of the supply pipe 25 is connected to the support shaft 2.
02 projecting into the side cover 8 from the pipe 29a, 2
9 is connected to the discharge port of the pump 28. Further, the supply pipe 25 has a portion near the other end (the cylindrical member 20).
1 (in the vicinity of the center portion of the first), a through hole 25a is provided, and the flange 24 is also provided with a through hole 24a.

The pump 28 discharges the lubricating oil 9 sucked by the suction pipe 29c to the pipe 29, and supplies the lubricating oil 9 to the upper and lower supply pipes 25 via the pipe 29a branched from the pipe 29. At the same time, the lubricating oil 9 is supplied to the upper and lower bearings 22 via a pipe 29b branched from the pipe 29.

According to the rotary die cutter configured as described above, when the operation is started, the temperature of each of the upper and lower bearings 22 rises. Part of the heat generated at this time is transmitted to the frame 1, part of the heat is transmitted to the cylindrical member 201 via the support shaft 202, and part of the heat is transmitted to the lubricating oil 9 supplied to the bearing 22. become. At this time, cylinders 20, 2
The central portion of 1, that is, the central portion of the cylindrical member 201 is in a state of normal temperature in which the above-mentioned heat has not yet been transmitted.

The lubricating oil 9 whose temperature has risen is supplied from the through-hole 25a of the supply pipe 25 to the cylindrical member 2 via a pump 28.
The temperature of the central portion of the cylindrical member 201 also rises by supplying it into the inside of the cylindrical member 201. The lubricating oil 9 supplied from the through hole 25a flows toward one end side while decreasing the temperature while being deprived of heat by the cylindrical member 201, and flows into the hole 24 of the flange 24.
a returns to the oil reservoir 8a of the side cover 8 from a. That is, although the temperature of the lubricating oil 9 gradually decreases as it goes to one end, the temperature can be made substantially uniform from the center of the cylindrical member 201 to the one end and the other end.

When the lubricating oil 9 passes through the support shaft 202 and the through hole 24a to the side lid 8, the support shaft 202,
The flange 24 and the bearing 26 are cooled from the inside, but the lubricating oil 9 obtains this heat and the temperature rises, and then the oil sump 8a
Will return to. By circulating the lubricating oil 9 in this manner, the cylindrical members 20 in the cylinders 20 and 21 are formed.
The temperature difference between the central part and the end part of the first unit can be made extremely small. That is, the temperature of the entire cylindrical member 201 in the cylinders 20 and 21 can be made substantially uniform.

Further, a part of the lubricating oil 9 discharged from the pump 28 is supplied through pipes 29 and 29b to lubricate and cool each bearing 22. Further, the lubricating oil 9 accumulated in the oil reservoir 8a is supplied to the driving gears 6 and 7 through meshing of the gears via an oiling gear 10. The lubricating oil 9 supplied to the gears 6, 7 is
Due to the centrifugal force of this, it scatters on the frame 1 and the side lid 8 and returns to the oil reservoir 8a along the frame 1, for example. At this time, the frame 1 is cooled by the lubricating oil 9.

That is, each support shaft 202, each bearing 2
2. Under the action of cooling the frame 1 with the lubricating oil 9, heat generated in each bearing 22 is given to the lubricating oil 9, and this heat is quickly applied by the lubricating oil 9 to the cylindrical members 20 of the cylinders 20 and 21.
1 can be given. In this manner, heat that increases the temperature at both ends of the cylindrical member 201 can be dispersed throughout the cylindrical member 201, and thus it is possible to prevent the cylindrical member 201 from being warped in a drum shape. In addition, since the temperature of the frame 1 is also substantially the same as the temperature of the cylindrical member 201, even if the distance between the axes of the cylinders 20 and 21 changes depending on the temperature of the lubricating oil 9, the dimensions between the cylindrical members 201 are good. It can be maintained precisely so that it can be cut (punched). As a result, there is a remarkable effect that a stable cutting state can be maintained even after a long operation.

In the above embodiment, the oil is circulated through the die-cut cylinder and the anvil cylinder. However, the oil may be circulated through one of the two cylinders depending on the situation. Although a cooler for cooling the lubricating oil 9 accumulated in the oil reservoir 8a is not provided, the provision of such a cooler reduces the temperature of the lubricating oil 9 accumulated in the oil reservoir 8a. You may comprise so that it may be controlled constant. With such a configuration, the change in dimension due to thermal expansion is kept constant at a predetermined value, so that a more remarkable effect can be obtained in obtaining a stable cutting state for a long time.

[0028]

According to the first aspect of the present invention, since oil circulates in each of the die-cut cylinder and / or the second cylinder, the oil is generated by each bearing, and both ends of each cylinder are generated. Can be distributed throughout each of these cylinders. Therefore, the temperature difference in the width direction (axial direction) of each cylinder can be reduced, and the temperature of each cylinder can be made substantially uniform. Therefore, since each cylinder can be prevented from warping in a drum shape, a stable cutting state can be maintained even after a long operation.

In the invention according to claim 2, lubricating oil for gears for driving the respective cylinders is used as the oil, and the lubricating oil is scattered by the gears and hangs on the frame. Is almost the same as that of each cylinder. Therefore, it is possible to reduce the difference between the amount of change in the center distance between the die-cut cylinder and the anvil cylinder caused by the thermal expansion of the frame and the amount of thermal expansion of each of these cylinders. In other words, even if the center distance of each cylinder changes according to the lubricating oil temperature,
The dimensions between the cylinders can be maintained precisely so that good cutting (punching) is possible. Therefore,
Even after a long operation, a more stable cutting state can be maintained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a punching part of a rotary die cutter shown as one embodiment of the present invention.

FIG. 2 is a partial sectional front view showing a structure of a punching portion of a rotary die cutter shown as a conventional example.

FIG. 3 is a cross-sectional view showing a punched portion of the rotary die cutter, and is a cross-sectional view taken along line AA of FIG.

FIG. 4 is a cross-sectional view showing a punched portion of the rotary die cutter, which is a cross-sectional view taken along line BB of FIG. 2, and gears are indicated by phantom lines.

[Explanation of symbols]

 1 Frame 6, 7 Gear 8a Oil reservoir 9 Lubricating oil 20 Die cut cylinder 21 Anvil cylinder 22 Bearing

Claims (2)

[Claims] 1. A rotary die cutter having a frame for rotatably supporting a die cut cylinder and an anvil cylinder via bearings, wherein oil is circulated inside the die cut cylinder and / or the anvil cylinder so that the width of the cylinder is reduced. A rotary die cutter for reducing a difference in directional temperature. 2. The method according to claim 1, wherein a lubricating oil for a gear driving the cylinder is used as the oil, and the lubricating oil is scattered by the gear and applied to a frame to reduce a temperature difference between the frame and the cylinder. Item 4. The rotary die cutter according to Item 1.