JP2005297351A - Tree branch cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tree branch cutter for small-scale horticulture which can inhibit noise during operation, easily cut tree branches and make easy its carriage and handling in maintenance and inspection. <P>SOLUTION: This tree branch cutter is constituted of a main body member 11 comprising an insertion opening 20 for wood to be cut W1, a guide path 30 continuing to the insertion opening 20 and a discharge part 40 for the cut wood W2; a drive part 50 disposed inside the main body member 11; and a cutting part 70. The drive part 50 includes a crank mechanism part 60 connected with a drive motor 51 through a reduction gear part 52. The cutting part 70 has a slider 71 which reciprocates by the crank mechanism part 60 and a blade 76 which is arranged at the tip of the slider 71 and advances to/recedes from the forward part of the guide path 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tree cutting machine that cuts tree branches that are generated during pruning and cutting of tree trunks and branches.

  Tree branches that are generated when tree trunks, branches, etc. are pruned and cut are usually buried in soil for composting or disposed of by incineration. In such a case, in order to reduce the bulk of the tree branch and facilitate the processing operation, the tree was crushed to an appropriate size mainly using a horticultural crusher.

  As the horticultural crusher described above, a crusher that rotates a rotating plate equipped with a crushing blade provided in the crusher and contacts the tree branch with the rotating plate to crush the tree branch is generally known (patent) Reference 1). In addition, a plurality of rotary blades are mounted on the cylindrical body, a fixed blade is provided in the vicinity of the rotational position of the rotary blade, and shearing is performed by rotating the cylindrical body so as to sandwich the tree branch between the fixed blade and the rotary blade. A crusher has also been reported (see Patent Document 2).

  However, in any crusher according to any patent document, the tree branch is crushed while the crushing blade (rotary plate, cylindrical body) is rotated. Therefore, noise is combined with the drive of the motor and the sound of the tree branch being hit by the device. growing. In addition, in order to obtain a rotational force, a motor or the like has to be enlarged so that a mechanism capable of obtaining a high output has been required. In addition, according to the crusher according to Patent Document 2, there is a problem that costs are required for the rotary blade and the fixed blade, and the weight of the crusher itself increases. Therefore, it is pointed out that it is difficult to move and the convenience of handling is bad.

As described above, the conventional crusher has been used mainly by horticultural operators with relatively large scales due to noise and handling. Therefore, there has been a strong demand for a device for treating a tree branch for small-scale horticultural use that can suppress the noise during operation, can easily handle the tree branch, and is easy to handle such as movement and maintenance. It was.
JP-A-7-32319 JP 2001-269590 A

  The present invention has been made in view of the above points, and for small-scale horticulture that suppresses noise during operation, can easily cut tree branches, and is easy to handle such as movement and maintenance inspection. Provide a tree cutting machine.

  That is, the invention of claim 1 includes a main body member having an insertion opening for a material to be cut, a guide path following the insertion opening, and a discharge portion for the cutting material, and a drive portion and a cutting portion disposed in the main body member. The drive unit includes a crank mechanism unit connected to a drive motor through a reduction gear unit, and the cutting unit is disposed at a slider that reciprocates by the crank mechanism unit and a tip of the slider. The present invention relates to a tree cutting machine comprising a blade that advances and retreats with respect to the front of a guide path.

  The invention according to claim 2 relates to the tree cutting machine according to claim 1, wherein an angle of the guide path with respect to the cutting tool of the cutting portion is formed to be 45 to 75 degrees.

  According to a third aspect of the present invention, there is provided a tree branch cutting according to the first or second aspect, wherein a pressing member for a material to be cut made of a plurality of leaf spring materials juxtaposed in the direction of the guide path is disposed above the guide path. Related to the machine.

  According to a fourth aspect of the present invention, there is provided a feed drum that is rotated by a ratchet mechanism that is rotated by a predetermined angle in conjunction with the elevation of the slider at the front portion of the guide path. The tree branch cutting machine according to claim 1.

  According to the tree cutting machine according to the first aspect of the present invention, a main body member having an insertion opening for a material to be cut (tree branch), a guide path following the insertion opening, and a discharge portion for the cutting material, and deployed in the main body member The drive unit includes a crank mechanism unit connected via a drive motor and a reduction gear unit, and the cutting unit includes a slider that reciprocates by the crank mechanism unit and the cutting unit. Since the blade is provided at the tip of the slider and moves forward and backward with respect to the front of the guide path, the load required for cutting the material to be cut can be reduced.

  Therefore, it is possible to reduce noise combined with the drive of a motor or the like found in a conventional crusher and the sound of a tree branch being hit by a crushing blade (rotary plate, cylindrical body) or the device itself. Further, the tree branch can be cut by a relatively simple mechanism while reducing the size of the drive motor, so that the weight of the tree cutting machine itself can be reduced, and handling such as movement and maintenance inspection becomes easy.

  According to the tree cutting machine according to the second aspect of the present invention, in the first aspect, the angle of the guide path with respect to the blade of the cutting part is formed to be 45 degrees to 75 degrees, so that the object to be cut supplied through the guide path is provided. Cutting resistance required for cutting the material can be reduced.

  According to the tree cutting machine according to the invention of claim 3, in claim 1 or 2, the pressing member for the material to be cut, which is composed of a plurality of leaf spring materials juxtaposed in the direction of the guide path, is disposed above the guide path. Therefore, when multiple materials to be cut are inserted, the size and shape of the material to be cut (tree branches) are also different, and the pressing of the material to be cut against the guide path should be made more complete. Can do.

  According to a tree cutting machine according to a fourth aspect of the present invention, in any one of the first to third aspects, the front portion of the guide path is rotated by a ratchet mechanism that rotates by a predetermined angle in conjunction with the elevation of the slider. Since the feed drum is arranged, the material to be cut can be reliably supplied to the front of the guide path, and the material to be cut can be cut almost sequentially by a predetermined amount with the blade.

  The present invention will be described below with reference to the accompanying drawings. 1 is an overall side view of a tree cutting machine of the present invention, FIG. 2 is an overall front view of the tree cutting machine of the present invention, FIG. 3 is a side view of the main part in the main body member of FIG. 1, and FIG. FIG. 5 is a perspective view of the main part in the vicinity of the pressing member in FIG. 3, and FIG. 6 is a perspective view of the main part in the vicinity of the feed drum in FIG.

  As can be understood from FIGS. 1 and 2, the tree cutting machine 10 of the present invention includes a main body member 11, a handle portion 15, a leg portion 16, and a wheel 17. The main body member 11 includes a left cover body 12a and a right cover body 12b that can be divided into left and right parts. The handle portion 15 is fixed to the main body member 11 (the left cover body 12a and the right cover body 12b) by a fixing screw 14, and the leg portion 16 is also fixed to the shaft 13 described later by the fixing screw 14. In particular, as shown in FIG. 2, the material to be cut W <b> 1 (mainly a tree branch) is inserted through the insertion opening 20. In the figure, reference numeral 15g denotes a handle, 17s denotes a wheel shaft, 18a denotes a main switch, and h denotes a hook. An appropriate bag (not shown) is provided on the hook h.

  FIG. 3 is a side view of the main part of the main body member 11 with the left cover body 12a removed. That is, as defined in the invention of claim 1, in the tree cutting machine 10 of the present invention, the main body member 11 is cut into the insertion opening 20 for the material W <b> 1 and the guide path 30 following the insertion opening 20. A discharge unit 40 for the material W2 is arranged.

  Furthermore, a drive unit 50 and a cutting unit 70 are provided inside the main body member 11. The drive unit 50 includes a crank mechanism unit 60 connected to the drive motor 51 via a reduction gear unit 52. The cutting section 70 includes a slider 71 that reciprocates by the crank mechanism section 60 and a blade 76 that moves forward and backward with respect to the front 39 of the guide path 30 provided at the tip 73 of the slider 71.

  Here, each part will be described in detail. In the main body member 11, a main body member opening 19 for inserting the material to be cut W1 is provided. In the embodiment, as is obvious from FIG. 3, the handle portion 15 is fitted into the main body member opening portion 19, and the insertion opening 20 is formed in the handle portion 15. The handle 15g of the handle portion 15 is in a convenient position to support the tree cutting machine when the tree cutting machine 10 is moved by the wheel 17. Furthermore, as shown in the positional relationship between the handle 15g and the workpiece W1, the insertion angle of the workpiece W1 is regulated by the handle 15g.

  The guide path 30 is formed on the upper surface of a guide mechanism portion 35 including a feed drum 90 and the like which will be described later, and guides the workpiece W1 inserted from the insertion opening 20 to the guide path front 39 (particularly, the push-cut plate 36). (Guidance). As a result, the workpiece W1 is guided directly below the cutter 76 (see FIG. 4) without swinging up and down, and the workpiece W1 can be cut by the cutter 76. The push plate 36 is made of a metal member. The push-cut plate 36 relieves the pressure generated in the guide mechanism portion 35 through the workpiece W1 during cutting and simultaneously reinforces the guide path 30 (guide mechanism portion 35), thereby facilitating shearing of the workpiece W1 by the blade 76. .

  The discharge unit 40 is a part that discharges the cutting material W2 generated when the workpiece W1 is cut by the blade 76 downward. In this case, the cutting material W2 is accommodated in an appropriate bag (not shown) provided on the hook h. In the figure, reference numeral 45 denotes a partition plate. By providing the partition plate 45 in this manner, it is possible to protect the cutting material W <b> 2 from bouncing due to an impact at the time of cutting and colliding with the driving unit 50, the slider 71, and the like.

  An appropriate motor is selected as the drive motor 51 included in the drive unit 50 according to the drive output. In a crusher motor that crushes a material to be cut (tree branch) while rotating a conventional rotating plate or the like, sufficient crushing is impossible unless a motor with an output of 1200 to 1500 W is used. However, if the material to be cut is cut by reciprocating movement using the crank mechanism portion 60 as in the present invention, the load on the drive motor can be reduced and the drive motor can be made smaller than before. it can. Incidentally, the drive motor 51 has an output of 350 W.

  The reduction gear unit 52 includes a plurality of gears (not shown) meshed. The rotational movement of the drive motor 51 is transmitted to the crank mechanism 60 (particularly the crank 61) at a reduced rotational speed. Five gears are used for the reduction gear unit 52 of the embodiment. The drive unit 50 is fixed to the shafts 13 and 13 by fixing units 55 and 55 provided in the reduction gear unit 52 (see FIGS. 4 and 5).

  As understood from FIGS. 3 and 4, the crank mechanism portion 60 includes a crank 61 connected to the reduction gear portion 52 and a rod 63 rotatably connected to the crank 61 via a crank pin 62. . In addition, the rod 63 and the cutting portion 70 (the rod connecting portion 75 of the slider 71) are connected by a rod pin 64 so as to be rotatable. Needless to say, the rotational movement of the drive motor 51 (the rotational movement of the crank 61 shown by the arrow d 1) is transmitted to the cutting portion 70 (rod connecting portion 75) via the rod pin 64 of the rod 63 and reciprocates to the slider 71. Movement (arrow d2).

  In this embodiment, the cutting unit 70 includes a slider 71, a reinforcing plate 72 that reinforces the surface of the slider 71, and a blade 76 disposed at the tip of the reinforcing plate 72. In the cutting part 70, the winding parts 74 and 74 of the slider 71 enable the slider 71 to reciprocate by winding the shafts 13 and 13 slidably.

  The slider 71 of the embodiment is made of resin in order to reduce the weight of the entire mechanism. Therefore, the slider 71 receives most of the load at the time of cutting, and the slider 71 needs to be reinforced. Therefore, by sticking the reinforcing plate 72 to the slider 71, it is possible to maintain a sufficient strength against the load at the time of cutting and to reduce the weight of the cutting portion 70. In particular, in the embodiment, since the reinforcing plate 72 extends to the rod connecting portion 75 of the slider 71 (see FIG. 6), the reinforcing plate 72 also reinforces the load generated in the rod connecting portion 75 during cutting. In addition, since the blade 76 is appropriately screwed to the reinforcing plate 72, replacement when the blade 76 is sharpened is facilitated. Of course, when the slider 71 is formed of a metal member, the reinforcing plate can be omitted.

  As shown in FIG. 4, the attachment angle φ of the blade 76 is attached to the push-cut plate 36 at an angle of 10 degrees to 30 degrees. By setting it as such attachment angle (phi), it becomes possible to cut | disconnect the to-be-cut material W1 diagonally, and can reduce the load which arises in the blade 76 at the time of a cutting | disconnection.

  As defined in the invention of claim 2 and as shown in FIG. 3, the angle θ of the guide path 30 with respect to the blade 76 of the cutting portion 70 is formed to satisfy 45 to 75 degrees. By setting it as such an angle, the cutting resistance required for the cutting | disconnection of the to-be-cut material W1 supplied through the guide path 30 can be decreased. However, if the angle θ is reduced, the cutting resistance can be reduced, but the cross-sectional area required for cutting the workpiece W1 increases. Therefore, the blade 76 (slider 71) has a larger distance by sliding (reciprocating). I need. On the other hand, when the angle θ is increased, the cutting resistance increases, but contrary to the above, the blade 76 (slider 71) can reduce the distance required for sliding (reciprocating).

  Considering the above points, the angle θ of the guide path 30 with respect to the blade 76 of the cutting portion 70 is preferably 45 degrees to 75 degrees as described above. According to the illustrated embodiment, this angle θ is designed to be 60 degrees.

  Continuing to refer to the configuration shown in FIGS. The guide mechanism fixing portions 33 and 33 fix the guide mechanism portion 35 to the shafts 13 and 13 in the same manner as the fixing portions 55 and 55 of the drive unit 50. The ends of the shafts 13 and 13 are inserted into the leg portions 16 and 16 and are fixed by the fixing screws 14, whereby the main body member 11 is fixed to the leg portion 16. In FIG. 3, reference numeral 80 is a pressing member, and 81 is a leaf spring material. Further, 81s indicated by a broken line is a leaf spring material in a state of pressing the material to be cut W1. In FIG. 4, reference numeral 98 is an interlocking hook, 56 is an interlocking hook lifting / lowering section, 93 is a wire, and 94 is a pulley.

  Further, in FIG. 3, a main switch 18a is a switch for controlling the driving of the tree cutting machine 10, and a rocker switch capable of rotating the drive motor 51 in the forward and reverse directions is used. The main switch 18a is also used for raising and lowering the slider 71 when the blade 76 is replaced. The drive motor protection switch 18b is a switch (circuit protector) that shuts off the circuit when a current exceeding a specified value is applied to the drive motor 51. The limit switch 18 c is a switch that stops the drive motor 51 when the handle portion 15 is removed from the main body member 11.

  FIG. 5 is a perspective view showing the main body member 11 (left cover body 12a, right cover body 12b) removed. That is, as specified in the invention of claim 3, a pressing member 80 made up of a plurality of leaf spring materials 81 juxtaposed in the direction of the guide path is installed above the guide path 30. Reference numeral 82 in the figure denotes a leaf spring material fixing body, which fixes a plurality of leaf spring materials 81 to the handle portion 15.

  Here, if it is assumed that there is a single leaf spring material in the pressing member, when a plurality of materials to be cut are inserted, this effectively acts to press the material to be cut having a large diameter. However, other cut materials having a small diameter cannot be pressed, and the left and right (refer to the left and right direction in FIG. 6) are easily swung on the guide path 30. As a result, it becomes difficult to guide another workpiece having a small diameter between the blade 76 and the press plate 36 (see FIG. 4).

  Accordingly, as shown in the figure, by providing a plurality of leaf spring materials 81, when a plurality of materials to be cut are inserted, the size and shape of the materials to be cut (tree branches) are also different. The pressing against the guide path 30 can be made more complete. For this reason, even if there are a plurality of materials to be cut having different sizes and shapes, it is easy to guide them between the blade 76 and the pressing plate 36 (see FIG. 4).

  Next, the invention of claim 4 will be described with reference to FIGS. Incidentally, FIG. 6 is a perspective view showing the main body member 11 (the left cover body 12a and the right cover body 12b) and the handle portion 15 removed. That is, as specified in the invention of claim 4, a feed drum 91 that is rotated by a ratchet mechanism 90 that rotates by a predetermined angle in conjunction with the raising and lowering of the slider 71 is disposed at the front portion of the guide path 30. The feed drum 91 has a groove 91m on the surface thereof, and rotates so as to entrain the material to be cut conveyed on the guide path 30.

  The ratchet mechanism 90 includes the feed drum 91, ratchet rod 92, wire 93, pulley 94, return spring 95, wire drum 96, ratchet rod contact body 97, and interlocking hook 98. Next, the operation of the ratchet mechanism 90 will be described.

  When the crank 61 rotates and passes through the bottom dead center to reach the top dead center, as already described in detail in the crank mechanism section 60, the slider 71 also slides on the shafts 13 and 13 and rises. At this time, the slider block 77 attached to the slider 71 in FIG. Therefore, the slider block 77 abuts on the interlocking hook 98 stored in the interlocking hook lifting / lowering unit 56 and raises the interlocking hook 98.

  A wire 93 is connected to the interlocking hook 98 and is also connected to a wire drum 96 via a pulley 94. Therefore, the wire drum 96 is pulled by the wire 93 and rotates. At the same time, the ratchet rod 92 connected to the wire drum 96 also rotates against the return spring 95. Therefore, the feed drum 91 connected to the ratchet rod 92 also rotates by a predetermined angle in conjunction with the operation of the wire 93 (up and down of the slider 71).

  Next, when the crank 61 rotates and passes through the top dead center to reach the bottom dead center, the slider 71 (slider block 77) moves down the shafts 13 and 13. In this case, the interlocking hook 98 also descends as the slider block 77 descends (see the interlocking hook 98 shown in FIG. 4). Therefore, the wire 93 that pulls the wire drum 96 is loosened. As a result, with the urging force of the return spring 95, the ratchet rod 92 is rotated back until it contacts the ratchet rod contact body 97 (see the vicinity of the return spring 95 shown in FIG. 6). However, when the ratchet rod 92 is pushed back, the feed drum 91 includes a ratchet mechanism (not shown claw and gear) and does not transmit the rotation of the ratchet rod 92 in the return direction.

  Due to the ratchet mechanism and its action, the feed drum 91 that rotates by a predetermined angle in conjunction with the raising and lowering of the slider 71 supplies the material to be cut to the guide path front 39 (push plate 36). In this way, the material to be cut is cut by the blade 76 by a certain amount almost sequentially. In addition, by adjusting the length of the wire 93, the rotation angle of the feed drum 91 can be changed to appropriately set the supply amount of the material to be cut. In addition, although not shown, it is also possible to attach a crank mechanism portion in place of the wire of the embodiment and rotate the ratchet rod in conjunction with the elevation of the slider.

  In the embodiment, as shown in FIG. 5, the plurality of leaf spring materials 81 are positioned immediately above the feed drum 91 and press the material to be cut against the feed drum 91. Therefore, the rotational movement of the feed drum 91 can be efficiently transmitted to the material to be cut, and when there are a plurality of materials to be cut, any of the materials to be cut can be supplied directly below the blade 76. Note that the shape of the groove 91m on the surface of the feed drum is appropriate, and in addition to the parallel grooves shown in the drawing, the tip shape of the groove may be a bowl shape in order to easily bite into the material to be cut. Furthermore, instead of the groove, an appropriate urethane material may be wound around the surface of the feed drum. Reference numeral 32 in FIGS. 5 and 6 denotes a guide wall portion. A handle portion 15 is attached inside the guide wall portion.

1 is an overall side view of a tree cutting machine according to the present invention. 1 is an overall front view of a tree cutting machine of the present invention. It is a principal part side view in the main-body member of FIG. It is a front view of the crank mechanism part and cutting | disconnection part of FIG. It is a principal part perspective view of the pressing member vicinity of FIG. It is a principal part perspective view of the feed drum vicinity of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tree cutting machine 11 Main body member 15 Handle part 16 Leg part 17 Wheel 20 Insertion opening 30 Guide path 35 Guide mechanism part 40 Discharge part 50 Drive part 51 Drive motor 52 Deceleration gear part 60 Crank mechanism part 61 Crank 63 Rod 70 Cutting part 71 Slider 72 Reinforcement plate 76 Blade 80 Holding member 81 Leaf spring material 90 Ratchet mechanism 91 Feed drum 95 Return spring W1 Material to be cut W2 Cutting material

Claims (4)

A main body member having an insertion opening for a material to be cut, a guide path following the insertion opening, and a discharge portion for the cutting material, and a drive part and a cutting part arranged in the main body member,
The drive unit includes a crank mechanism unit connected via a drive motor and a reduction gear unit,
The cutting unit includes a slider that reciprocates by the crank mechanism and a blade that is disposed at a tip of the slider and moves forward and backward with respect to the front of the guide path.   The tree cutting machine according to claim 1, wherein an angle of the guide path with respect to the cutting tool of the cutting part is formed to be 45 degrees to 75 degrees.   The tree cutting machine according to claim 1 or 2, wherein a pressing member for a material to be cut made of a plurality of leaf spring materials juxtaposed in the guide path direction is disposed above the guide path.   4. The tree cutting machine according to claim 1, wherein a feed drum that is rotated by a ratchet mechanism that rotates by a predetermined angle in conjunction with the raising and lowering of the slider is disposed at a front portion of the guide path.

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