JP2008273054A - Cutting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a cutting machine capable of improving a biting property of blades of a feed roller into a thick material to be cut and a bundle thereof. <P>SOLUTION: In the cutting machine, the blade 24 of the feed roller 12 is extended in the tangent direction of an outer peripheral part of a rotating shaft 20 in a connection part 25 to the rotating shaft 20, and a tip end side is disposed at the front side of the rotational direction of the rotating shaft 20 rather than the connection part 25. The distance L1 between the blade 24 and a bottom wall part 18B in such a state that the blade 24 rotating from the upper side to the lower side of the rotating shaft 20 becomes in parallel with the bottom wall part 18B of a feed gutter 18 can be set to be large. Therefore, the biting property of the blade 24 into the thick timber M can be improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cutting machine for cutting an object to be cut such as a fence or a branch.

  Conventionally, a cutting machine called a chipper has been used to cut (crush) pruned branches and the like of trees (see, for example, Patent Document 1). Such a chipper includes a supply rod for supplying an object to be cut to the cutting processing unit, and a scraping wheel (supply roller) is provided inside the supply rod. Such a supply roller includes a rotary shaft that is rotationally driven and a plurality of blades that are radially fixed to the outer periphery of the rotary shaft. These blades are extended in the radial direction of the rotating shaft. The rotating shaft is movable in the vertical direction and is urged downward, and the supply roller is usually disposed close to the bottom wall portion of the supply rod.

In the chipper configured as described above, when the object to be cut is supplied into the supply trough, the tip of the blade of the supply roller bites above the end of the object to be cut, and the supply roller has the thickness of the object to be cut. In response, it is moved upward. Then, the object to be cut is fed into the cutting processing unit at a constant speed according to the rotation speed of the supply roller while being sandwiched between the tip of the blade of the supply roller and the bottom wall of the supply rod. It has become.
Japanese Utility Model Publication No. 63-180207

  However, in the supply roller of the above chipper, basically, the tip of the blade rotating from the upper side to the lower side of the rotation shaft is parallel to the bottom wall portion of the supply rod, and If the object to be cut is supplied to the side, the blade is further rotated, so that the tip of the blade is bitten into the object to be cut. For this reason, the thickness of the object to be cut and the bundle to be supplied to the supply rod are larger than the distance from the blades in the parallel state to the bottom wall (approximately the same as the distance from the axis of the rotating shaft to the bottom wall). If it is too thick, the tip of the blade may not bite into the workpiece. In addition, in this case, the object to be cut may be pushed back by the blades rotating from the upper side of the rotating shaft toward the parallel position, and it may be difficult to supply the object to the supply rod.

  An object of the present invention is to obtain a cutting machine that can improve the biting property of blades of a supply roller with respect to a thick workpiece or a bundle thereof in consideration of the above facts.

  A cutting machine according to the invention described in claim 1 is a cutting processing unit for cutting an object to be cut, a supply rod connected to the cutting processing unit, to which the workpiece is supplied, and a bottom of the supply rod A rotating shaft that is provided above the wall portion and is driven to rotate, and a blade that extends from the outer peripheral portion of the rotating shaft to the outside in the radial direction of the rotating shaft, and is supplied into the supply rod. A supply roller that supplies the cutting processing unit while sandwiching the blade between the tip portion and the bottom wall portion of the blade, and the blade of the supply roller is connected to the rotating shaft. Further, the front end portion is arranged on the front side in the rotational direction of the rotating shaft.

  In the cutting machine according to claim 1, the tip of the blade of the supply roller is arranged on the front side in the rotation direction of the rotation shaft with respect to the connection portion to the rotation shaft. For this reason, the distance between the tip part of the blade and the bottom wall part in a state where the tip part of the blade rotating from the upper side to the lower side of the rotation shaft is parallel to the bottom wall part of the supply rod is set large. be able to. Therefore, the biting property of the blades of the supply roller with respect to a thick object to be cut or a bundle thereof can be improved.

  A cutting machine according to a second aspect of the present invention is the cutting machine according to the first aspect, characterized in that the blades extend in a tangential direction of the outer peripheral portion of the rotating shaft in the connecting portion. .

  In the cutting machine according to claim 2, when the blade of the supply roller rotates from the upper side to the lower side of the rotation shaft, the blade is separated from the bottom wall portion by the radius of the rotation shaft from the axis of the rotation shaft. Parallel to the bottom wall at the position. Therefore, the distance between the tip portion and the bottom wall portion of the blade in the parallel state can be set large.

  As described above, in the cutting machine according to the present invention, it is possible to improve the biting property of the blades of the supply roller with respect to a thick workpiece or a bundle thereof.

  FIG. 1 is a longitudinal sectional view showing a configuration of a stationary chipper 10 as a branch cutting machine according to an embodiment of the present invention. 2 and 3 show a partial configuration of the chipper 10 in a longitudinal sectional view.

  For convenience of explanation, in FIGS. 1 to 3, the upward direction of the apparatus is indicated by an arrow UP, and the forward direction of the apparatus is indicated by an arrow FR.

  The chipper 10 includes a hollow body 14, and a cutting chamber 16 that is formed in a drum shape and forms a cutting processing unit is provided inside the body 14. The rear side of the cutting chamber 16 is open, and a supply rod 18 is connected to the opening.

  The supply rod 18 includes a bottom wall portion 18B inclined downward toward the cutting chamber 16 side, and a supply roller 12 is provided in the vicinity of the cutting chamber 16 above the bottom wall portion 18B.

  As shown in FIG. 2, the supply roller 12 includes a rotation shaft 20 disposed above the bottom wall portion 18 </ b> B of the supply rod 18. The rotary shaft 20 is arranged with the width direction of the machine body 14 (direction perpendicular to the paper surface in FIGS. 1 to 3) as the axial direction, and a pair of rocks (not shown) attached to both side walls of the machine body 14 so as to be able to swing. The moving arm is rotatably supported by the moving arm. Thereby, the rotating shaft 20 is movable in the vertical direction with respect to the body 14. Further, the rotating shaft 20 is urged toward the bottom wall 18B side by an urging force of an urging member (not shown), and is usually at the lowest position (the position shown in FIG. It is arranged at the “lower limit position”.

  The rotary shaft 20 is connected to an engine 22 disposed below the airframe 14 via a driving force transmission mechanism (not shown). When the engine 22 is driven, the rotary shaft 20 is moved to the arrow shown in FIGS. It is rotated in the A direction.

  A plurality of (six in this embodiment) blades 24 formed in a long rectangular flat plate shape are attached to the outer peripheral portion of the rotating shaft 20. These blades 24 are arranged in a state in which the longitudinal direction is along the axial direction of the rotary shaft 20, and are arranged at equal intervals along the circumferential direction of the rotary shaft 20, and one end portion (base end portion) in the width direction. Is fixed to the outer periphery of the rotary shaft 20. Note that saw blades are formed on the other end portions (tip portions) in the width direction of the blades 24.

  Each blade 24 extends (protrudes) from the outer peripheral portion of the rotating shaft 20 to the radially outer side of the rotating shaft 20, and extends in the tangential direction of the outer peripheral portion of the rotating shaft 20 at the connecting portion 25 to the rotating shaft 20. ing. And the front end side of each blade | wing 24 is a rotation axis rather than the radial direction (normal line V of the outer peripheral part of the rotating shaft 20) of the rotating shaft 20 in the rotation direction front side of the rotating shaft 20 rather than the connection part 25, ie, the connecting part 25. 20 is arranged on the front side in the rotational direction. Note that the connecting portion 25 is a boundary portion between a portion in contact with the rotating shaft 20 and a portion away from the rotating shaft 20 in each blade 24.

  Further, a pair of side plates 32 formed in a disk shape are provided on both sides in the axial direction of the rotary shaft 20 (only one side plate 32 is shown in FIGS. 1 to 3). The rotating shaft 20 passes through the axial center of each side plate 32, and each side plate 32 is coaxially and integrally fixed to the rotating shaft 20. The side plates 32 are integrally joined to the longitudinal ends of the blades 24.

  In the supply roller 12 configured as described above, when the rotary shaft 20 rotates in the direction of arrow A in FIGS. 1 to 3, the blades 24 and the side plates 32 rotate in the direction of arrow A in FIGS. It is like that. For this reason, when the wood M (object to be cut) is supplied to the inside of the supply rod 18, the leading end portion (saw tooth) of the rotating blade 24 bites into the upper side of the end portion of the wood M and is shown in FIG. Thus, the supply roller 12 is moved upward according to the thickness of the wood M. Then, the wood M is forcibly fed into the cutting chamber 16 at a constant speed according to the rotational speed of the supply roller 12 while being sandwiched between the tip end portion of the blade 24 and the bottom wall portion 18B of the supply rod 18. It is supposed to be.

  On the other hand, as shown in FIG. 1, a cutting mechanism 36 constituting a cutting processing unit is provided inside the cutting chamber 16. The cutting mechanism 36 includes a main shaft 38 arranged with the width direction of the machine body 14 (direction perpendicular to the paper surface in FIG. 1) as an axial direction. The main shaft 38 is rotatably supported by a bearing (not shown) attached to the side wall of the airframe 14 so that the driving force of the engine 22 is transmitted via a driving force transmission mechanism (not shown). As a result, the main shaft 38 rotates in the direction of arrow B in FIG.

  A plurality (three in this embodiment) of discs 40 are coaxially and parallelly attached to the main shaft 38, and these three discs 40 rotate integrally with the main shaft 38. A plurality (four in this embodiment) of hammer shafts 42 are attached to the outer periphery of the disk 40. These hammer shafts 42 are arranged at equal intervals along the circumferential direction of the disk 40 and in parallel with the main shaft 38.

  A plurality of free hammers 44 each formed in a substantially rectangular flat plate shape are supported on each hammer shaft 42 in parallel and rotatably. Therefore, when the main shaft 38 rotates, the hammer shaft 42 rotates (turns) around the main shaft 38, and the free hammer 44 rotatably supported by the hammer shaft 42 rotates around the main shaft 38. . For this reason, as described above, when the wood M is fed into the cutting chamber 16 by the supply roller 12, the free hammer 44 is swung down to the end of the wood M. Thereby, the edge part of the timber M is the structure which is crushed and cut | disconnected (crushing) between the fixed blades 45 fixed to the body 14, and is divided | segmented into the fine crushing piece.

  In addition, the free hammer 44 shown by the chain line in FIG. 1 shows a state when the main shaft 38 is stopped.

  On the other hand, a discharge port 46 is formed on the front side of the cutting chamber 16, and a crushing net 48 is attached to the discharge port 46. The crushing net 48 is a plate material curved in an arc shape, and forms a part of the inner wall of the cutting chamber 16. In the crushing net 48, a plurality of discharge holes 50 for discharging the crushed pieces of the wood M from the cutting chamber 16 are formed, and the crushed pieces (chips) discharged through the discharge holes 50 are separated from the cutting chamber 16. It is discharged to the outside of the apparatus through a discharge basket 52 connected to the front side of the apparatus.

  Next, the operation and effect of this embodiment will be described.

  In the chipper 10 having the above-described configuration, when the wood M is supplied to the inside of the supply rod 18, the tip end (saw tooth) of the blade 24 of the supply roller 12 rotating at the lower limit position bites above the end of the wood M. At the same time, the supply roller 12 is moved upward according to the thickness of the wood M. The wood M is forcibly fed into the cutting chamber 16 at a constant speed corresponding to the rotational speed of the supply roller 12 while being sandwiched between the tip end portion of the blade 24 and the bottom wall portion 18B of the supply rod 18. It is.

  Here, the blade 24 of the supply roller 12 extends in a tangential direction of the outer peripheral portion of the rotating shaft 20 in the connecting portion 25 to the rotating shaft 20, and the tip side is ahead of the connecting portion 25 in the rotating direction of the rotating shaft 20. Arranged on the side. For this reason, the distance L1 between the blade 24 and the bottom wall portion 18B in a state where the blade 24 rotating from the upper side to the lower side of the rotary shaft 20 is parallel to the bottom wall portion 18B of the supply rod 18 is set large. can do. Therefore, the biting property of the blades 24 with respect to the thick wood M can be improved.

  That is, when the blades 24 are attached radially to the rotary shaft 20 as in the supply roller 100 shown in FIG. 4 (conventional example), the blades 24 are parallel to the bottom wall portion 18B. For the wood M that is thicker than the distance L2 to the wall 18B, the tip of the blade 24 may not be satisfactorily cut. In this regard, in the present embodiment, the distance L1 between the blades 24 in the parallel state and the bottom wall portion 18B is set to be larger than the distance L2, so that the same diameter as that of the supply roller 100 remains, and the thick wood The biting property of the blades 24 with respect to M can be improved.

  Even when the diameter of the supply roller 100 shown in FIG. 4 (the radius of the rotation trajectory at the tip of the blade 24) is increased, the biting property of the blade 24 with respect to the thick wood M can be improved. However, in this case, the overall configuration of the apparatus is increased, and the distance L3 from the position where the tip of the blade 24 is closest to the bottom wall portion 18B to the rotation locus of the hammer 44 is increased. In this case, since the minimum length dimension of the wood M that can be pressed by the supply roller 100 becomes long, the ratio of the wood M (chips) that is discharged without being cut as it is long increases.

  In this regard, in the present embodiment, the bite rate of the blades 24 with respect to the thick wood M can be improved without increasing the diameter of the supply roller 12, so the ratio of chips that are discharged without being cut for a long time. Will not increase.

  In the above-described embodiment, the supply roller 12 includes the six blades 24 formed in a flat plate shape. However, the present invention is not limited to this, and the number and shape of the blades may be changed as appropriate. it can.

  Moreover, in the said embodiment, although the blade | wing 24 of the supply roller 12 was set as the structure extended in the tangential direction of the outer peripheral part of the rotating shaft 20 in the connection part 25 to the rotating shaft 20, this invention is not restricted to this. The blades of the supply roller only need to have a tip portion disposed on the front side in the rotation direction of the rotation shaft with respect to the connection portion to the rotation shaft, and may be configured as shown in FIG. 5, for example.

  In the supply roller 60 shown in FIG. 5, the blade 24 is bent at the intermediate portion in the width direction, and the front end side is arranged on the front side in the rotation direction of the rotation shaft 20 relative to the connection portion 25 to the rotation shaft 20. Also in the supply roller 60, the tip end side and the bottom wall portion 18 </ b> B of the blade 24 in a state where the tip end side of the blade 24 rotating from the upper side to the lower side of the rotating shaft 20 is parallel to the bottom wall portion 18 </ b> B of the supply rod 18. The distance between can be set large. Therefore, there is basically the same effect as the above embodiment.

  Furthermore, in the above-described embodiment, the configuration is such that saw blades are formed at the tip of the blade 24 of the supply roller 12, but the present invention is not limited to this, and a knife-like blade is formed at the tip of the blade 24. A configuration may be used.

  Moreover, in the said embodiment, you may make it the structure which provides the roller which can rotate in the position facing the supply roller 12 in the bottom wall part 18B of the supply rod 18. FIG. In this case, the wood M (object to be cut) is supplied to the cutting chamber 16 while being sandwiched between the supply roller 12 and the roller.

  Moreover, although the said embodiment demonstrated the case where this invention was applied with respect to the chipper 10 (cutting machine) which cut | disconnects a to-be-cut object by the some free hammer 44 rotated around the main axis | shaft 38, this invention The present invention can also be applied to a cutting machine (so-called cutter) that cuts an object to be cut (grass, twigs, etc.) with a rotary blade (a knife-like blade formed) that rotates around the main axis.

It is a longitudinal cross-sectional view which shows the structure of the chipper which concerns on embodiment of this invention. It is sectional drawing to which a part of FIG. 1 was expanded. It is sectional drawing corresponding to FIG. 2 which shows the state by which the timber was clamped between the bottom wall part of a supply rod and a supply roller. It is sectional drawing which shows the structure of the conventional supply roller and its peripheral member. It is sectional drawing which shows the structure of the supply roller which concerns on the modification of embodiment of this invention, and its peripheral member.

Explanation of symbols

10 Chipper (Cutting machine for toothpick)
12 Supply roller 16 Cutting chamber (cutting section)
18 Supply rod 18B Bottom wall portion 20 Rotating shaft 24 Blade 36 Cutting mechanism (cutting processing portion)
M Wood (object to be cut)

Claims (2)

A cutting processing section for cutting an object to be cut;
A supply rod connected to the cutting processing unit and supplied with an object to be cut;
A rotating shaft provided above the bottom wall portion of the supply rod and driven to rotate, and a blade extending from the outer peripheral portion of the rotating shaft to the outside in the radial direction of the rotating shaft, and is supplied into the supply rod A supply roller that supplies the cut object to the cutting processing unit while sandwiching the cut object between the tip portion of the blade and the bottom wall portion;
And the blade of the supply roller has a tip portion disposed on the front side in the rotational direction of the rotary shaft with respect to the connecting portion to the rotary shaft.   The cutting machine according to claim 1, wherein the blade extends in a tangential direction of the outer peripheral portion of the rotating shaft in the connection portion.

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