JP2005324308A - Sheet material cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lengthen the service life of a cutter single body and to enhance cushioning property by curving strip pieces large. <P>SOLUTION: The respective cutter single bodies 16 in a pair of roller cutters 5, 6 are juxtaposed on base shafts 15 being circumferentially shifted in phase so that cutout grooves 18 formed on the outer peripheral surfaces are lined up at the same inclination angle and in the same phase in mutually opposite directions with respect to the axes of the respective roller cutters 5, 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of a cutting apparatus that cuts a waste sheet material such as cardboard into discontinuous strips so as to be processed into a buffer material.

  2. Description of the Related Art Conventionally, a thick sheet material such as corrugated cardboard, which is no longer necessary, is cut into strips of a predetermined length and packed into a bag as a cushioning material for a packaged product.

  However, such strips are cumbersome to pack, and are difficult to collect and recycle after use, causing problems such as scattering when thrown away as trash and increasing the amount of trash.

  In order to solve this problem, the applicant of the present subject can cut a sheet material such as corrugated cardboard into a discontinuous strip shape so that it can be processed into a buffer material of a sheet material that is excellent in handling and recyclable. A cutting device was devised and a patent application was filed first (see Patent Document 1).

JP 2002-355570 A

  The conventional sheet material cutting apparatus described in the above patent document is a roller cutter that rotates relative to each other by providing a notch groove on the outer peripheral surface of a plurality of cutters that are alternately fitted in a pair of roller cutters. A sheet-shaped cushioning material is obtained by alternately forming elongated curved strips and uncut portions on a sheet material inserted therebetween.

  However, since the notch grooves formed in each cutter unit are arranged in a straight line parallel to the axis of the roller cutter, the sheet material is all at once by the outer peripheral edge of the cutter unit facing between the notch grooves. The strips are cut into strips that are elongated and curved in a direction perpendicular to the insertion direction.

  For this reason, the cutting resistance acting on the roller cutter is large, the noise at the time of cutting is increased, and the life of the cutter itself is also short.

  Further, since the cut strips are not curved in the thickness direction beyond the outer diameter of the cutter alone, the buffering properties were slightly poor.

  In addition, the conventional roller cutter was formed by cutting out the shaft-like material, including the cutter itself, so the manufacturing cost was high and each cutter could not be removed. And could not be polished.

  The present invention has been made to solve the above problems, and by shifting the phase of the cutter unit in the circumferential direction, the cutting resistance acting on the cutter unit can be reduced, and the life of the cutter unit can be extended. Another object of the present invention is to provide an inexpensive sheet material cutting apparatus that greatly reduces the length of a strip and improves buffering properties, and allows the cutter alone to be attached and detached so that replacement or polishing can be easily performed.

In order to achieve the above object, a sheet material cutting apparatus according to claim 1 of the present invention comprises a plurality of disc-shaped cutters having notch grooves on an outer peripheral surface thereof arranged in parallel at regular intervals in the axial direction. The pair of roller cutters are rotated relative to each other with their adjacent cutters alternately fitted to each other, and the sheet material passing between the opposing surfaces of both roller cutters is formed into a discontinuous strip shape. In the sheet material cutting device designed to cut,
The cutters in the pair of roller cutters are phased in the circumferential direction so that the notch grooves formed on the outer peripheral surfaces thereof are aligned with the same inclination angle and the same phase in opposite directions with respect to the axis of each roller cutter. It is characterized by being arranged side by side.
According to this feature, when the sheet material is cut by each cutter alone in the pair of roller cutters, the uncut portion and the cut strip pieces are inclined with respect to the axis of the roller cutter. For this reason, an axial thrust acts on the sheet material, and this thrust acts as a force for obliquely pressing the cut strip, so the strip is greatly curved in the thickness direction.
Accordingly, when the corrugated cardboard or the like is cut and processed into a cushioning material, it has a high cushioning property.
Further, since the strip is cut obliquely in the width direction of the sheet material, the cutting resistance acting on each cutter unit is reduced, noise is reduced, and the life of the cutter unit can be extended.

A sheet material cutting device according to a second aspect of the present invention is the sheet material cutting device according to the first aspect, wherein a required angle is formed on the outer peripheral surface of the base shaft of each roller cutter in opposite directions with respect to the axis. A phase of each cutter unit is provided by providing an inclined recess or projection and fitting a projection or recess provided on the inner surface of the fitting hole to the base shaft of each cutter unit into the recess or projection. And is detachably mounted on the base shaft.
According to this feature, the phases of all the cutters can be easily shifted by simply inserting the cutters into the base shafts of both roller cutters.
In addition, the cutter alone can be easily replaced or polished, and the replacement can be performed only with the cutter alone, which is economical.

A sheet material cutting device according to a third aspect of the present invention is the sheet material cutting device according to the first aspect, wherein a concave or convex line parallel to the axis is formed on the outer peripheral surface of the base shaft of each roller cutter. A protrusion is provided on the inner surface of the fitting hole for the base shaft in each cutter unit, and a protrusion or a recess whose phase is sequentially shifted in the inner circumferential direction is provided, and the protrusion or the recess is fitted to the recess or the protrusion. As a result, the phase of each cutter unit is shifted, and the base shaft is detachably mounted.
According to this feature, in addition to the effect of the second aspect, since it is sufficient that the base shaft is provided with a linear recess or protrusion parallel to the axis, the processing is easy and the processing cost is reduced. The

A sheet material cutting device according to a fourth aspect of the present invention is the sheet material cutting device according to any one of the first to third aspects, wherein unevenness for preventing slippage is formed on an outer peripheral surface of each cutter. It is characterized by providing.
According to this feature, since the pressing force effectively acts on the cut strip, it can be greatly curved in the thickness direction.

A sheet material cutting device according to a fifth aspect of the present invention is the sheet material cutting device according to any one of the first to fourth aspects, wherein an angle of inclination with respect to an axis of a notch groove of a single cutter in both roller cutters. Is characterized by being 10 to 20 °.
According to this feature, since an appropriate thrust acts on the sheet material, it is possible to prevent the cut strips from being excessively bent or bent.

A sheet material cutting device according to a sixth aspect of the present invention is the cutting device according to any one of the first to fifth aspects, wherein a concave cutting blade is formed on the outer peripheral surface of each cutter unit in both roller cutters. The portions are provided with slightly different phases so that the cutting blade portions of the cutter unit of both roller cutters do not overlap each other.
According to this feature, each time a single cutter is rotated, the strip in the sheet material is reliably cut by the cutting blade portion of the opposing cutter.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a cutting apparatus 1 according to the present invention, and FIG. 2 is an enlarged vertical front view of a main part. An arm 3 is a support part on an upper surface of a box-like base 2. 4 is provided integrally. A pair of upper and lower roller cutters 5 and 6 are rotatably accommodated in the arm portion 3 and in the upper end portion of the base 2 facing the lower surface thereof.

  Each roller cutter 5, 6 has support shafts 7, 7 extending from both ends, on the bearings 8, 8 provided on the arm 3 in the upper roller cutter 5, and on the base 2 in the lower roller cutter 6. The bearings 9 and 9 provided are rotatably supported by being inserted into the bearings 9 and 9, respectively.

  A driven gear 10 and a drive gear 11 having the same number of teeth are respectively attached to the ends of the left support shaft 7 of the upper and lower roller cutters 5 and 6, and the drive gear 11 is connected via a pulley 12 and a belt 13. The two roller cutters 5 and 6 are rotated relative to each other by being rotated by a motor 14 provided in the base 2.

  The upper and lower roller cutters 5 and 6 are formed by fitting a large number of disc-shaped cutters 16 having a larger diameter to the outer peripheral surface of the base shaft 15 via the spacer collar 17 at regular intervals in the axial direction. It is configured. The opposing end portions of the cutter single bodies 16 adjacent to each other in the upper and lower roller cutters 5 and 6 are alternately fitted to each other, and the sheet material S such as corrugated cardboard is cut by these fitting portions.

  The cutter unit 16 is made of, for example, tool steel vacuum-quenched, and has two notch grooves 18 and 18 that are recessed in the centripetal direction, as shown in FIGS. Is formed.

  Both corners of the outer peripheral end of the notch groove 18 are arcuate curved surfaces, and the upper and lower surfaces of the sheet material S are prevented from being damaged when the sheet material S passes through. Is made to continue smoothly.

  Further, as shown in FIG. 6, the depth of the notch groove 18 is such that when the notch grooves 18 of the upper and lower adjacent cutter units 16 are aligned in the circumferential direction, they overlap slightly and overlap each other. .

  On the entire outer peripheral surface excluding the vicinity of the portion where the cutout groove 18 is formed in each cutter unit 16, a number of uneven strips 19 for preventing slipping are formed. In addition, a protruding strip 21 projects toward the center on a part of the inner peripheral surface of the fitting hole 20 drilled at the center of the upper and lower cutter unit 16.

  As shown in FIG. 4, a stopper collar 22 is formed at the left end of the upper and lower base shafts 15 (the lower base shaft is not shown), and a male screw is formed on the outer peripheral surface excluding the support shaft 7 at the right end portion. 23 is engraved.

  Further, on the outer peripheral surface of the base shaft 15 from the right end surface of the stopper flange 22 to the right end of the male screw 23, a groove groove 24 inclined by 10 to 20 °, preferably 15 ° is formed with respect to the axis of the support shaft 7. ing.

  As shown in FIG. 3, the groove 15 that has the same phase as the groove 24 and is inclined at the same inclination angle in the opposite direction is also formed on the base shaft 15 of the lower roller cutter 6.

  By fitting the single cutter 16 into the base shaft 15 alternately with the spacer collar 17 while fitting the protruding strip 21 into the concave groove 24, the phase of the notch groove 18 of each cutter 16 is shifted in the circumferential direction. As shown in FIGS. 2 and 3, the cutout grooves 18 of the upper and lower cutter units 16 are aligned in the axial direction facing the opposite directions at the same inclination angle as the concave groove 24.

  As shown in FIG. 2, the angle θ formed by the notch grooves 18 of the upper and lower cutter units 16 is preferably about 30 °, for example. Then, after fitting all the cutter units 16, the nuts 25 are screwed into the male screws 23, so that each cutter unit 16 is prevented from rotating and fixed to the base shaft 15.

  Next, the point which processes the sheet | seat material S, such as cardboard, into a shock absorbing material using the cutting device 1 of the said embodiment is demonstrated.

  When the sheet material S is inserted between the upper and lower roller cutters 5 and 6 that rotate in synchronization with each other in the opposite direction by the motor 14 in a direction perpendicular to the axial center, as shown in FIG. When the fitting portion is pressed in the vertical direction by both outer peripheral surfaces, it is cut into strips having the same width as the plate thickness by the outer peripheral edges of both cutter units 16.

  When the upper and lower cutter units 16 further rotate and the notch grooves 18 overlap each other, as shown in FIG. 6, the cutting of the sheet material S is stopped at that portion, and the sheet material S includes a groove of the notch groove 18. An uncut portion 26 having a width substantially the same as the width is formed. The non-cutting portions 26 are formed by the number of the cutout grooves 18 every time the cutter unit 16 is rotated once, and between the non-cutting portions 26, the strip pieces 27 are formed in a discontinuous arc shape that is curved and cut in the vertical direction. Is formed.

  At this time, the phase of the upper and lower cutter units 16 is shifted, and the cutout grooves 18 arranged in the axial direction are inclined in opposite directions. Therefore, the uncut portion 26 and the strip 27 between them are as shown in FIGS. In addition, the roller cutters 5 and 6 are inclined with respect to the axis.

  As described above, when the uncut portion 26 and the strip 27 are tilted, the axial force (leftward in FIG. 7) acts on the sheet material S, and the sheet material S is restrained from moving leftward. Therefore, it acts as a force for pressing the cut strip 27 obliquely, and it is greatly bent in the vertical direction.

  As a result, the swell of the strip 27 is increased and a large space is formed inside, so that a high cushioning property as a cushioning material is obtained. In particular, when the sheet material S such as corrugated cardboard is inserted, if the sheet material S is inserted in a state where the fiber direction of the sheet material S is parallel to the axis, the bulge of the strip piece 27 becomes larger. Since a large space is formed inside, a high buffering property as a buffer material can be obtained.

  Further, since a large number of uneven strips 19 for preventing slipping are formed on the outer peripheral surface of the cutter unit 16, the pressing force is effectively applied to the strip piece 27 so that it can be bent more greatly.

  Further, since the strip 27 is cut at an angle along the width direction of the sheet material S without being cut at a time, the cutting resistance applied to the cutter unit 16 is small, noise is reduced, and the cutter is cut. The life of the single unit 16 is also extended.

  Since the cutter unit 16 is detachably fitted to the base shaft 15, it can be easily replaced and polished, and it is not necessary to replace the entire roller cutters 5 and 6 as in the prior art, so the cost can be reduced. It becomes.

  The present invention is not limited to the above embodiment.

  When it is desired to cut the sheet material S to a certain size, as shown in FIG. 9, a sharp cut portion 28 is formed on the inner wall on the opposite side to the rotation direction by providing a concave cut portion 28 in a part of the outer peripheral surface of each cutter unit 16. The strips 27 may be cut along the width direction by the narrow blade portion 29.

  At this time, the position of the cutting portion 28 is preferably provided in the vicinity of the notch groove 18. If it does in this way, the strip piece 27 of the comparatively hard part near the non-cutting part 26 can be cut | disconnected.

  Further, it is preferable to form the upper and lower cutter units 16 so as to be shifted from each other in the circumferential direction so that the cut portions 28 do not overlap each other.

  The number of the notch grooves 18 in the cutter unit 16 may be one or more depending on the length of the sheet material S and the outer diameter of the cutter unit 16.

  As means for shifting the phase of the single cutter 16 to the base shaft 15 and fitting it, the following may be used in addition to the above-described embodiment.

  That is, as shown in FIG. 10, the formation portions of the protruding strips 21 of the cutter units 16 arranged in the left-right direction are slightly shifted in the circumferential direction, and the protruding strips 21 are formed on the outer peripheral surface of the base shaft 15. What is necessary is just to fit into the groove groove | channel which is parallel to an axis.

  Further, contrary to the above embodiment, a ridge may be provided on the base shaft 15 side, and a groove formed in the fitting hole 20 of the cutter unit 16 may be fitted to the ridge.

It is a partially cutaway perspective view of the cutting device in one embodiment of the present invention. Similarly, it is an enlarged vertical front view of the main part of FIG. Similarly, it is a perspective view of a part of the upper and lower roller cutters. Similarly, it is a disassembled perspective view of the structural member of an upper roller cutter. Similarly, it is a side view of the fitting part of the upper and lower cutter unit, and an explanatory view of the cutting procedure of the strip. Similarly, it is a side view showing the formation point of the non-cutting part by the notch groove of the upper and lower cutter unit. It is a top view of a part of buffer material obtained by cutting a sheet material. Similarly, it is a perspective view of a buffer material. It is a partial perspective view which shows the example which provided the concave cutting blade part in the cutter single-piece | unit of a roller cutter. This is a modified example in which the positions of the protrusions of the individual cutters are shifted in the circumferential direction to change the phase of each individual cutter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting device 2 Base 3 Arm part 4 Support part 5, 6 Roller cutter 7 Support shaft 8, 9 Bearing 10 Driven gear 11 Drive gear 12 Pulley 13 Belt 14 Motor 15 Base shaft 16 Cutter simple substance 17 Spacer collar 18 Notch groove 19 Uneven groove (Unevenness)
20 Fitting hole 21 Projection piece (convex part)
22 Stopper flange 23 Male thread 24 Concave groove 25 Nut 26 Uncut part 27 Strip piece 28 Cutting part 29 Blade part S Sheet material

Claims (6)

A pair of roller cutters in which a plurality of disc-shaped cutters having notched grooves on the outer peripheral surface are arranged side by side in the axial direction, and the cutters adjacent to each other are alternately fitted to each other. In the sheet material cutting apparatus, the sheet material that is rotated relative to each other and passes between the opposing surfaces of both roller cutters, is cut into a discontinuous strip shape.
The cutters in the pair of roller cutters are phased in the circumferential direction so that the notch grooves formed on the outer peripheral surfaces thereof are aligned in the opposite direction with the same inclination angle and the same phase with respect to the axis of each roller cutter. A sheet material cutting device, wherein the sheet materials are arranged side by side.   Provided on the outer peripheral surface of the base shaft of each roller cutter is a recess or protrusion that inclines at a required angle in opposite directions with respect to the axis, and a protrusion or recess provided on the inner surface of the fitting hole for the base shaft in each cutter unit. The sheet material cutting device according to claim 1, wherein the cutter is shifted from the phase of each cutter by being fitted to the recess or the protrusion, and is detachably attached to the base shaft.   Convex ridges or ridges parallel to the axis are provided on the outer peripheral surface of the base shaft of each roller cutter, and the convex portions are sequentially shifted in the inner peripheral direction on the inner surface of the fitting hole for the base shaft in each cutter unit. Alternatively, the sheet material according to claim 1, wherein a concave portion is provided and the phase of each cutter is shifted by fitting the convex portion or the concave portion with the concave stripe or the convex stripe, and the sheet material is detachably attached to the base shaft. apparatus.   The sheet material cutting device according to any one of claims 1 to 3, wherein unevenness for preventing slippage is provided on an outer peripheral surface of each cutter unit.   The sheet material cutting device according to any one of claims 1 to 4, wherein an inclination angle of the notch groove of the single cutter in both roller cutters is 10 to 20 °.   6. The concave cutting blade portion is provided on the outer peripheral surface of each cutter unit in both roller cutters, with a phase slightly different from each other so that the cutting blade portions in the cutter units of both roller cutters do not overlap each other. The sheet | seat material cutting apparatus in any one.

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