JPH0822519B2 - Cutting device - Google Patents

Description

The present invention relates to a rotary knife type cutting device for cutting paperboard and the like.

[Prior Art] As a rotary knife type cutting device, "supported by a gantry,
A pair of knife shafts that rotate in mutually opposite directions, and a pair of knives that are provided on each of the outer peripheral portions of both knife shafts in a spiral shape around the central axis of the knife shafts and that mesh with each other when the two knife shafts rotate. And a cutting device having a drive device for rotating both knife shafts.

In the above cutting device, since both knives have a spiral shape, when both knife shafts rotate at a constant angular velocity, the meshing of the cutting blades moves in the knife axial direction at a constant velocity. Therefore, by rotating both knife shafts in synchronization with the speed of the object to be cut, a pair of knives start meshing at each cross section of the object to be cut, cut the object to be cut, and then end meshing. The meshing work is made to progress with time from one end in the width direction of the object to be cut to the other end, and the cutting of the object to be cut is completed in the width direction.

FIG. 10 shows an example of a conventional cutting device, 1 and 2 are upper and lower knife shafts, 1A and 2A are knife seating surfaces, 3 and 4 are upper and lower knives, 5, 6 and 7 are bolts, and 8 and 9 are Upper and lower pressing members.

By the way, in the above-mentioned conventional cutting device, the knife seating surfaces provided on the two knife shafts are arranged to be parallel to each other under the condition that both knife shafts are located at the cutting point where the meshing starts as shown in FIG. It is supposed that the blades of both knives are set by pressing each knife in a direction perpendicular to the knife seating surface (knife thickness direction) by the knife position adjusting bolt (bolt 7 in FIG. 10) set.

That is, both knives are set on the corresponding knife axes as follows.

At the stage of fixing to the knife shaft before being pressed by the knife position adjusting bolt, both knives take into consideration the existence of errors in their processing accuracy and mounting accuracy, and a certain adjustment gap is set between their parallel cutting edges. Granted.

Next, each knife is pressed by the knife position adjusting bolt in a direction perpendicular to the knife seating surface to deform it, and as a result, the cutting edge of each knife is set to an appropriate relative position.

Further, as a rotary knife type cutting device as described above,
As described in Japanese Patent Publication No. 61-46277, "a pair of support shafts fixed at both ends to a frame and a pair of hollow drums supported by bearings on the support shafts and rotating in opposite directions to each other. And a cutting device having a pair of knives fixed to the outer peripheral portion of each drum and meshing with each other when both drums rotate, and a drive device for rotating both drums.

According to the above cutting device, since the support shaft is fixed at both ends with respect to the gantry, the supporting condition of the drum provided with the knife can be regarded as fixed at both ends, and the rotary shaft provided with the conventional knife is mounted via the bearing. As compared with the case where both ends are supported by the frame, the deflection of the drum can be significantly reduced and the sharpness of the knife can be improved. Further, the inertia GD ² hollow drum with a knife, the inertia of the actual rotation axis in with a conventional knife GD ²
Compared to, it is significantly reduced under the same external dimension conditions.
Therefore, the power consumption for rotating the drum can be reduced.

That is, the sharpness of the knife can be improved without increasing the power consumption of the drive device.

[Problems to be Solved by the Invention] However, according to the study by the present inventor, in the cutting device in which the knife shaft is composed of the support shaft and the hollow drum as described above, the support shaft is simply fixed to both ends of the frame. However, bending is likely to occur in the middle of the support shaft due to the influence of gravity and the reaction force of cutting with the work to be cut, and as a result it is very difficult to equalize the blade contact of the upper and lower knives in the longitudinal direction. It turned out to be accompanied by.

It is an object of the present invention to equalize the blade contact of a pair of knives in the longitudinal direction thereof and improve the sharpness, life and cutting workability of the knives.

[Means for Solving the Problems] The present invention is directed to a pair of support shafts fixed at both ends to a gantry, and supported by bearings on each of the support shafts, and rotating in opposite directions to each other, together with the support shaft. A pair of hollow drums that form the knife shaft, and a pair of hollow drums that are provided on the outer peripheral portions of both drums that form the knife shaft so as to form a spiral around the center axis of the drums and that mesh with each other when the drums rotate. In a cutting device having a knife and a drive device for rotating both drums, a tensile force applying bolt is interposed between the gantry and each end face of each supporting shaft, and the tensile force applying bolt corresponds to It is held on a frame via a fixing plate in the axial direction of the supporting shaft and screwed to the upper half of the end surface of the supporting shaft so that the tensile force outward in the axial direction can be applied to the upper half. Outer circumference of both drums Each part is equipped with a spiral knife seating surface, and both knife seating surfaces are set to cross each other under the condition that they are located at the cutting point where both knives start meshing, and each knife is parallel to the knife seating surface. The knife position adjusting portion is provided so as to be able to move forward and backward in the direction.

[Operation] According to the present invention, both knives are set to the corresponding knife shafts as follows.

(1) Temporarily hold each of the two knives on a spiral knife seating surface provided on the corresponding knife shaft.

(2) The knife position adjusting unit moves the knives forward and backward along their knife seating surfaces, and sets the cutting blades of both knives to proper relative positions at the cutting point where the two knives start to mesh with each other.

Thus, according to the present invention, (a) both knives are moved back and forth in the direction parallel to the knife seating surface (the direction along the knife seating surface) by the knife position adjusting section, and the knife seating as in the prior art is performed. Since it is not pressed in the direction perpendicular to the plane (the thickness direction of the knife), the cutting edges of both knives can be set on the spiral line which does not undulate in the longitudinal direction in the above (2).

Further, (b) the knife seating surfaces of both knife shafts are set so as to intersect each other at the cutting point.
By advancing and retracting both knives in, the desired clearance including zero clearance can be set between the cutting edges of both knives.

As a result of the above (a) and (b), the blade contact (clearance) of both knives becomes uniform in the longitudinal direction. Thereby, the sharpness and life of the knife can be improved. Further, both cutting edges overlap each other over the entire length of the knife to realize a cutting workability for performing a constant clearance cut, and a beautiful cut surface can be obtained.

Further, in the present invention, the upper and lower knife shafts are composed of the upper and lower support shafts and the upper and lower intermediate drums, and the tensile force imparting bolts are provided on the upper half portions of both end faces of the upper and lower support shafts so as to extend outward in the axial direction. Since both ends of the support shaft are fixed to the pedestal in a state in which a tensile force is applied, (a) the upper support shaft eliminates the downward deflection in the middle of the upper support shaft due to the influence of gravity (such as an iron plate). Except when cutting a special object to be cut, the upward deflection due to the upward cutting reaction force on the upper spindle does not exceed the downward deflection due to gravity.) (B) For the lower spindle, the influence of gravity and the cut It is possible to eliminate the downward bending in the middle of the lower support shaft due to the influence of a cutting reaction force generated between the lower support shaft and the upper support shaft and to straighten the central axes of the upper and lower support shafts. That is, the central axis of the hollow drum supported by each supporting shaft can be straightened, and the blade contact of the pair of knives can be equalized in the longitudinal direction. Thereby, the sharpness and life of the knife can be improved.

[Embodiment] FIG. 1 is a schematic view showing a cutting device according to an embodiment of the present invention, FIG. 2 is a sectional view showing a left half portion of the cutting device, and FIG. 3 is a III-III line in FIG. 4 is a schematic view showing a disposition state of a knife, FIG. 5 is a front view showing a drum, FIG. 6 is a schematic view showing an angular velocity changing region of the drum, and FIG. 7 is a spindle fixing. Sectional view showing the structure, FIG. 8 is a side view of FIG. 7,
FIG. 9 is a schematic view showing a cross section of the cutting device.

As shown in FIGS. 1 to 3, the cutting device 10 includes a pair of upper and lower support shafts 12A and 12B fixed to the base 11 at both ends.
And a pair of upper and lower hollow drums 14A and 14B which are supported by bearings 13 on the respective support shafts 12A and 12B and rotate in mutually opposite directions, and the outer peripheral portions of the respective drums 14A and 14B are fixed respectively. It has a pair of upper and lower knives 15A and 15B that mesh with each other when rotating 14A and 14B, and a drive unit 16 that rotates both drums 14A and 14B.

Both ends of the upper and lower support shafts 12A and 12B are fitted and supported in support holes 17 provided in the pedestal 11, and fixing plates 19 fixed to the both end surfaces with bolts 18 are fixed to the pedestal 11 with bolts 20. (See FIGS. 7 and 8). As a result, the upper and lower support shafts 12A and 12B are fixed to the frame 11 at both ends. In addition, the bolt 18 for fixing the upper and lower support shafts 12A and 12B to the fixing plate 19
Are provided at least on the upper half side of their central axes. That is, the bolt 18 constitutes a tensile force applying means, and the fixing plate 19 for fixing the gantry 11 and the support shaft 12 are provided.
It is interposed between each of the end faces of A and 12B, and is held by the gantry 11 in the axial direction of the corresponding support shaft 12A (12B), and at the upper half of the end face of the support shaft 12A (12B). Be connected.
Then, by strongly tightening the bolts 18, 18 on the upper half side on each of both end surfaces of the support shaft 12A (12B),
The support shafts 12A, 12B in a state in which a tensile force (preload) outward in the axial direction is applied to the upper half of both end surfaces of the support shaft 12A (12B)
Both ends are fixed to the pedestal 11, and as a result, the support shafts 12A, 1A due to the influence of gravity and the cutting reaction force generated between the work and the cut object.
Deflection in the middle of 2B is eliminated, the central axes of the support shafts 12A and 12B are straightened, and the deflection of the knives 15A and 15B is prevented.

The upper and lower hollow drums 14A and 14B are the corresponding support shafts.
It is supported on the outer peripheral portions of 12A and 12B via a plurality of pairs of bearings 13 (see FIG. 2). Bearings 13 are spindles 12A, 1
It is set by a nut 21 screwed on both ends of 2B and a collar 22 mounted on the outer peripheral portions of the support shafts 12A, 12B. Further, driven gears 24A and 24B are fixed to both end surfaces of the hollow drums 14A and 14B by bolts 23, and the driven gears 24A and 24B are supported by the corresponding support shafts 12A and 12B via a pair of bearings 25. . The bearing 25 is set by a nut 26 screwed to both ends of the support shafts 12A and 12B. The driven gear 24A fixed to both ends of the drum 14A and the driven gear 24B fixed to both ends of the drum 14B and corresponding to the driven gear 24A mesh with each other, whereby the upper drum 14A and the lower drum 14B are mutually engaged. It can rotate in the opposite direction.

The upper and lower drums 14A and 14B are provided with spiral knife seating surfaces 27 on their outer peripheral portions as shown in FIG. Here, as shown in FIGS. 3 and 4, the two knife seating surfaces 27 are set so as to intersect each other under the state of being located at the cutting point where the two knives 15A and 15B start to mesh with each other.

The upper and lower knives 15A and 15B are the corresponding drums 14
It is fixed to the knife seating surface 27 of A and 14B by bolts 28, and as a result, the cutting edges of both knives 15A and 15B are drum 14A and 1B.
Set so as to form a spiral around the center axis of 4B.
As a result, when both the drums 14A and 14B rotate at a constant angular velocity, the knives 15A and 15B move in the axial direction of the drums 14A and 14B at a constant speed at which the cutting blades mesh with each other. Therefore, in this cutting device 10, by rotating both drums 14A, 14B in synchronization with the speed of the object to be cut, both knives 15A, 1
5B The knife meshing work, in which meshing starts in the widthwise angular cross section of the cut object, cuts the cut object, and then ends meshing, is performed from one end in the width direction of the cut object to the other end over time. Then, the object to be cut is completely cut in the width direction.

In addition, in the upper and lower drums 14A and 14B, the knife seating surface 27
As shown in FIGS. 3 to 5, knives each including two push bolts 102 and one pull bolt 103 are provided at a plurality of positions in the longitudinal direction of the bolt supporting convex portion 101 provided along the knife. A position adjusting unit is provided. The push bolt 102 is screwed onto the bolt supporting convex portion 101 to press the back portions of the knives 15A and 15B,
The pulling bolt 103 is loosely inserted in the bolt supporting convex portion 101, and is screwed into the back portion of each knife 15A, 15B so that each knife 15A, 1B.
Pull in 5B. This allows push bolt 102 and pull bolt 1
03 allows each knife 15A, 15B to advance and retract in a direction parallel to the knife seating surface 27.

In FIG. 3, reference numeral 29 denotes a drum cover, and the cover 29 excludes the blade edges of the knives 15A and 15B, and the drums 14A and 14B.
It is a cylindrical body that covers the outer periphery of the
It is possible to secure stable feeding of the cut object by preventing falling into the outer recesses of A and 14B, suppressing turbulence of the air flow around the drums 14A and 14B rotating at high speed. 30 is a cover mounting rib.

The drive device 16 includes two A's corresponding to both ends of the upper drum 14A.
2 corresponding to both ends of C servo motor 31A and lower drum 14B
And an AC servo motor 31B. Each motor 31A, 31B is fixed to the pedestal 11 with a bolt 32, and the output shaft 33 of each motor 31A, 31B is pedestal via bearings 34, 35.
Supported by 11. A drive gear 36A meshed with the above-mentioned driven gear 24A is fixed to the output shaft 33 of both upper motors 31A, and a drive gear 36B meshed with the above-mentioned driven gear 24B is fixed to the output shaft 33 of both lower motors 31B. . The motor is driven by one main unit and the other three units as helpers, and four units are simultaneously driven by the same torque command as the main motor. As a result, the driving of both drums 14A and 14B is subject to up / down, left / right,
Synchronous rotation with no twist can be secured over the entire length of both drums 14A and 14B.

Here, since the cutting device 10 cuts an object to be cut to an arbitrary length, the control device and the motors 31A and 31B rotate the drums 14A and 14B at a non-constant speed during one rotation (see FIG. 6). ). That is, as shown in FIG. 4, the upper and lower knives 15
The meshing end points (B in FIG. 6) where A and 15B start meshing at each cross-section in the width direction of the workpiece and end meshing at a cutting point (point A in FIG. 6) at which the workpiece is cut Point) to a knife engagement angle of 15 degrees, and this knife engagement operation extends from one end in the width direction of the workpiece to the other end
The range of 35 degrees including the degree is set as the tuning area with the speed of the object to be cut, and the acceleration / deceleration /
It is a pause area. Here, in order to cut the object to be cut to an arbitrary length, the acceleration / deceleration time and the pause time are controlled by the control device.

In the above cutting device 10, since the upper and lower support shafts 12A and 12B are fixed to both ends of the frame 11, the drum 14
The deflection of A and 14B can be greatly reduced and the sharpness of knives 15A and 15B can be improved. Also, a drum 14 equipped with knives 15A and 15B.
Since A and 14B are hollow, the inertia GD ² can be greatly reduced, and the power consumption of the motors 31A and 31B for rotating the drums 14A and 14B can be reduced. Therefore, the sharpness of the knives 15A and 15B can be improved without increasing the power consumption of the drive device 16.

As shown in FIG. 9, the cutting device 10 has upper and lower air blowing heads 20 on one side of the upper and lower drums 14A and 14B, respectively.
1A and 201B are arranged, and the upper and lower air suction heads are on the other side.
202A and 202B are arranged. Each air blowing head 201A,
The compressed air blown out from the blowout port 203 of 201B goes backwards to the movement loci of the knives 15A and 15B of the corresponding drums 14A and 14B and is sucked into the suction ports 204 of the air suction heads 202A and 202B. At this time, the compressed air removes the chips (paper scraps of paperboard, paper dust, etc.) of the cut objects attached to the knives 15A and 15B.
The air suction heads 202A, 202B are dust-collected with the cuttings removed from A and 15B. As a result, the good cutting quality of the knives 15A and 15B is maintained.

 Next, the operation of the above embodiment will be described.

According to the cutting device 10, both knives 15A, 15B are set on the corresponding drums 14A, 14B as follows.

(1) Drum 14 corresponding to both knives 15A and 15B
The spiral knife seating surface 27 provided on A and 14B is temporarily held.

(2) The push bolt 102 and the pull bolt 103 as the knife position adjusting section move the respective knives 15A and 15B forward and backward along their knife seating surfaces 27, and at the cutting point where the two knives 15A and 15B start meshing, Set the cutting edges of both knives 15A and 15B to the proper relative positions.

Then, in the cutting device 10, (a) both knives 15
A and 15B are moved back and forth in a direction parallel to the knife seating surface 27 (a direction along the knife seating surface 27) by a push bolt 102 and a pull bolt 103 as knife position adjusting parts. Since it is not pressed in the direction perpendicular to 27 (the thickness direction of knives 15A and 15B),
In the above (2), the cutting edges of both knives 15A and 15B can be set in a spiral line shape that does not undulate in the longitudinal direction.

Further, (b) since the knife seating surfaces 27 of both the drums 14A and 14B are set so as to intersect each other at the cutting point, the forward and backward movement of the two knives 15A and 15B in the above (2) causes the two knives 15A and 15B to move forward and backward. A desired clearance including zero clearance can be set between the cutting edges.

As a result of (a) and (b) above, both knives 15A and 15B
The blade contact (clearance) is even in the longitudinal direction. As a result, the sharpness and life of the knives 15A and 15B can be improved. In addition, both cutting edges overlap over the entire length of the knives 15A and 15B, cutting workability for performing a constant clearance cut can be realized, and a beautiful cut surface without tearing the cut object in the thickness direction can be obtained. it can.

Further, according to the cutting device 10, the knife shaft is supported by the support shafts 12A and 12B.
And the hollow drums 14A and 14B, and the support shafts 12A and 12B in a state in which axial tension force based on the fastening force of the bolt 18 is applied to the upper half of both end surfaces of the support shafts 12A and 12B. Since both ends are fixed to the shafts, the middle deflection of the support shafts 12A and 12B due to the influence of gravity and the cutting reaction force generated between the work and the object to be cut is eliminated, and the center axes of the support shafts 12A and 12B are straightened. Can be planned. That is, the central axes of the hollow drums 14A and 14B supported by the support shafts 12A and 12B can be straightened,
The blade contact of the pair of knives 15A and 15B can be equalized in the longitudinal direction. With this, the sharpness of the knives 15A and 15B,
The life can be improved.

The present invention can be widely applied to general rotary cutting devices such as a cutting device in which the knife shaft is a solid shaft.

[Effects of the Invention] As described above, according to the present invention, the blade edges of a pair of knives can be equalized in the longitudinal direction thereof, and the sharpness, life, and cutting workability of the knives can be improved.

[Brief description of drawings]

1 is a schematic view showing a cutting device according to an embodiment of the present invention, FIG. 2 is a sectional view showing a left half portion of the cutting device, and FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is a schematic view showing the arrangement of knives, FIG. 5 is a front view showing the drum, FIG. 6 is a schematic view showing the angular velocity changing region of the drum, and FIG. 7 is a cross section showing the support shaft fixing structure. Figure, Figure 8 is a side view of Figure 7,
FIG. 9 is a schematic diagram showing a cross section of the cutting device, and FIG. 10 is a schematic diagram showing a conventional example. 10 …… Cutting device, 11 …… Stand, 12A, 12B …… Spindle 14A, 14B …… Hollow drum (knife shaft), 15A, 15B …… Knife, 16 …… Drive device, 18 …… Bolt (pulling force) Attaching bolt), 19 ... Fixing plate, 27 ... Knife seating surface, 102 ... Pushing bolt (knife position adjusting part), 103 ... Pulling bolt (knife position adjusting part),

Claims (1)

[Claims] 1. A pair of support shafts having both ends fixed to a gantry, and a pair of hollow shafts supported by bearings on the respective support shafts and rotating in opposite directions to form a knife shaft together with the support shaft. A drum and a pair of knives, which are provided on each of the outer peripheral portions of the drums that form the knife shaft so as to form a spiral around the central axis of the drums and mesh with each other when the drums rotate, rotate both drums. In a cutting device having a driving device, a tensile force applying bolt is interposed between the gantry and each end face of each supporting shaft, and the tensile force applying bolt is fixed in the axial direction of the corresponding supporting shaft. The drum is held on a pedestal via a plate, and is screwed to the upper half of the end surface of the support shaft so that the axial outward pulling force can be applied to the upper half, and the outer peripheral portions of both drums are respectively attached. To spiral It has a knife seating surface and is set so that both knife seating surfaces cross each other under the condition where they are located at the cutting point where both knives start meshing, and each knife can be moved back and forth in a direction parallel to the knife seating surface. And a knife position adjusting section.