JP2007289126A - High branch lopping machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high branch lopping machine that can keep the cutting angle of the cutting blade during the cutting work for low grass and tree and high branch and can miniaturize the cutting main body and decrease the cost. <P>SOLUTION: The fixing shaft 50 is allowed to ride between the joint case 21 for the lopping main body 20 and the lopping blade-supporting case 22 and is set slidably so that the joint 21 may contact to and remove from the cutting blade-supporting case 22 in the perpendicular direction to the longitudinal direction of the operation rod 2 by the right and left rotation of the knob nut 54. Further, on the space between the faces of the joint case 21 in the circumference direction of the fixing shaft 50 and the cutting blade-supporting case 22, these faces each mutually bite on the opposing faces in the direction crossing in the longitudinal direction to the operating rod 2, thereby providing the projection part 35 for controlling the rotation of the cutting blade-supporting case 22 and the ring gear part 45. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a high pruning machine that cuts low vegetation and high branches, and more particularly to a high pruning machine capable of adjusting the angle of a cutting blade.

  2. Description of the Related Art Conventionally, there has been known a high pruning machine capable of adjusting the angle of a cutting blade so that a tree can be pruned into a desired shape, such as horizontal cutting or oblique cutting of low plants and high branches (see, for example, Patent Document 1).

  As shown in FIG. 12, in this type of high pruning machine 1, the rotational driving force is applied to the reciprocating driving force at the distal end portion of the operating rod 2 in which the driving force transmission shaft for transmitting the engine driving force is inserted. A cutting unit main body 4 that reciprocates and moves the cutting blade (reciprocating blade) 3 in a detachable manner is attached detachably. Then, the cutting unit main body 4 includes a cutting blade support case 6 between a joint case 5 connected to the operating rod 2 and a cutting blade support case 6 connected to the cutting blade 3 and rotatably connected to the joint case 5. An angle adjusting unit 7 that adjusts the angle of the cutting blade 3 by being fixed to the joint case 5 is provided.

Japanese Patent No. 3457399

  However, as shown in FIG. 13, the angle adjusting unit 7 is provided with a shaft of a knob bolt 10 as a fixing member provided in the joint case 5 in the guide groove 9 of the guide member 8 fixed to the cutting blade support case 6. Part 11 is fitted. Then, the cutting blade support case 6 is rotated so that the cutting blade 3 has a desired angle, and then the knob bolt 10 is tightened, whereby the cutting blade support case 6 is fastened together with the joint case 5 and fixed. Was fixed at a desired angle. For this reason, since the cutting blade support case 6 is fixed to the joint case 5 by the knob bolt 10, that is, fixed by a point (point stop), if the knob bolt 10 is loosened during the operation of cutting the low vegetation or the high branches. The crimping force that fixed the cutting blade support case 6 together with the joint case 5 is reduced, and the cutting blade support case 6 may rotate. And if the cutting blade support case 6 rotates, the angle of the cutting blade 3 will change, and it will become impossible to prun a tree to the desired shape.

  Moreover, according to this angle adjustment part 7, not only the cutting part main body 4 will be enlarged by external arrangement | positioning of the guide member 8 or the knob bolt 10, but there also exists a problem of causing the raise of the cost by the enlargement of a component.

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and that the angle of the cutting blade does not change during the operation of cutting low vegetation and high branches, An object of the present invention is to provide a high pruning machine capable of reducing the size and cost of the machine.

In order to achieve the above object, the first invention is to reciprocate the cutting blade by converting the rotational driving force into the reciprocating driving force at the tip of the operating rod in which the driving force transmitting shaft for transmitting the engine driving force is inserted. In the high branch mower to which the reaping part main body to be attached is detachably attached,
The cutting part main body straddles a joint case that is connected to the operation rod, a cutting blade support case that is connected to the cutting blade and is rotatably connected to the joint case, and the joint case and the cutting blade support case. And an angle adjusting unit that fixes the cutting blade at a desired angle by fixing the cutting blade support case to the joint case, and the angle adjusting unit is arranged in the longitudinal direction of the operation rod. And a contact / separation means that enables the joint case and the cutting blade support case to contact and separate in a direction orthogonal to the longitudinal direction of the operation rod, provided between opposing surfaces of the joint case and the cutting blade support case And a concave-convex meshing means for restricting the rotation of the cutting blade support case by meshing in a direction perpendicular to the vertical direction.

  In order to achieve the above object, according to a second invention, in the first invention, the contacting / separating means is configured such that one end is fixedly supported by the cutting blade support frame and the other end penetrates the joint case. A fixed shaft that is slidably supported by the joint case and formed with a threaded portion, and a direction that is interposed between the fixed shaft and the joint case and separates the joint case and the cutting blade support case And a nut member that allows the joint shaft and the cutting blade support case to be brought into contact with and separated from each other by meshing with a threaded portion of the stationary shaft. It is characterized by being.

  To achieve the above object, according to a third invention, in the first or second invention, the meshing means is a polygonal columnar shape or a V-shape extending in a direction perpendicular to the longitudinal direction of the operation rod. It has a projection and a ring gear.

  According to the first to third inventions, even if the nut member connecting the joint case and the cutting blade support case is loosened, the cutting blade support case is provided as long as the projection and the ring gear portion are engaged with each other. Is restricted. That is, the cutting blade support case does not rotate unless the nut member is loosened and the joint case and the cutting blade support case are separated from each other until the protrusion and the ring gear portion are not engaged with each other. Thereby, it is possible to provide a high pruning machine in which the angle of the cutting blade does not change during the operation of cutting low plants and high branches.

  Furthermore, by arranging most of the angle adjustment unit excluding the nut member between the facing surfaces of the joint case and the cutting blade support case and in the cutting unit body, the cutting unit body can be reduced in size, The cost can be reduced by downsizing the constituent members.

  In order to achieve the above object, according to a fourth aspect, in the third aspect, the protrusion or the ring gear portion is surface-joined to an opposing surface portion of the joint case or the cutting blade support case.

  According to the fourth invention, when the joint case and the cutting blade support case are joined by the nut member, either the protrusion or the ring gear portion is on the opposing surface portion of the joint case or the cutting blade support case facing each other. Since the surface bonding is performed, the positional accuracy can be improved as compared with the case of using the chrysanthemum.

  According to the high branch mower of the present invention, even if the nut member is loosened, the cutting blade support case is prevented from rotating as long as the engaging portion provided between the opposing surfaces of the joint case and the cutting blade support case is engaged with each other. Is done. Thereby, it is possible to provide a high pruning machine in which the angle of the cutting blade does not change during the operation of cutting low plants and high branches. Furthermore, by arranging most of the angle adjustment unit excluding the nut member between the facing surfaces of the joint case and the cutting blade support case and in the cutting unit body, the cutting unit body can be reduced in size, The cost can be reduced by downsizing the constituent members.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments that are considered to be most suitable for the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a plan view of a cutting unit body in the high pruning machine of the present invention, FIG. 2 is a side view of the cutting unit body, FIG. 3 is a side sectional view of the cutting unit body of FIG. 2, and FIG. FIG. 5 is a plan sectional view of the cutting part main body, FIG. 6 is an exploded perspective view of a connecting portion between the joint case and the cutting blade support case in the same example, and FIG. 7 is the same example. FIG. 8 is a side view of the joint case viewed from the cutting blade support case side, and FIG. 9 is a side view of the cutting blade support case viewed from the joint case side. 10 (a) and 10 (b) are schematic views of the cutting unit main body showing a range suitable for the cutting operation, and (c) is a schematic diagram of the cutting unit main body suitable for storage and packaging, FIG. 11 (a) is a side view of the harvesting unit main body with the cutting blade facing upward as much as possible in a range suitable for the harvesting operation, and (b) is the harvesting operation. Side view of the cutting body which is maximize downward cutting blade in the preferred range, (c) is housed, it is a side view of a preferred cutting body during packaging.

  In addition, the same code | symbol is attached | subjected about the structural member similar to the past.

  According to the present invention, a reaping portion main body that converts a rotational driving force into a reciprocating driving force and reciprocates a cutting blade can be attached to and detached from the distal end portion of an operating rod in which a driving force transmission shaft for transmitting an engine driving force is inserted. It is applied to the attached high pruning machine.

  As shown in FIGS. 1 and 2, the cutting unit main body 20 in this high pruning machine includes a joint case 21 connected to the distal end portion of the operating rod 2 and a base of a pair of upper and lower reciprocating blades (hereinafter referred to as cutting blades) 3. A cutting blade support case 22 that is disposed between the joint case 21 and a cutting blade support case (also referred to as a gear case) 22 that has a continuous end portion and is rotatably connected to the joint case 21. An angle adjusting unit 23 that fixes the cutting blade 3 at a desired angle by fixing 22 to the joint case 21 is provided.

  In the following description, the cutting unit main body 20 is attached to the distal end portion of the operating rod 2, and therefore, the longitudinal direction of the operating rod 2 will be described as the front-rear direction, and the cutting blade support case 22 is provided with respect to the joint case 21. It demonstrates as what rotates and approaches.

  Moreover, the code | symbol 12 in FIG. 1 has shown the cover which covers the cutting blade 3 at the time of non-use, and the code | symbol 13 has shown the pressing plate (it is also called a blade guide) which supports the cutting blade 2 so that sliding is possible.

First, the joint case 21 will be described.
1-5, the joint case 21 is formed in the cylindrical body, and the insertion part 24 in which the front-end | tip part of the operating rod 2 is inserted is integrally formed in the rear part. The insertion portion 24 has a slit 26 (see FIG. 4) so that the diameter can be changed by tightening or loosening a fixing screw (for example, Torx screw, screw nut, etc.) 25 (shown in FIGS. 3 and 4). (Illustrated). The insertion portion 24 has a diameter larger than that of the operating rod 2 by loosening the fixing screw 25 when the operating rod 2 is inserted and removed, and is tightened by fixing the fixing screw 25 when the operating rod 2 is fixed. The diameter is reduced and crimped to the operation rod 2.

  Further, as shown in FIGS. 3 and 4, the insertion portion 24 is provided with a positioning screw 27 penetrating the side surface of the insertion portion 24 so as to be slidable in the front-rear direction. The distal end portion is fitted into a recessed portion provided at a predetermined position of the operation rod 2 inserted into the insertion portion 24, whereby the operation rod 2 and the joint case 21 are positioned. Yes.

  Further, as shown in FIG. 5, a first rotating shaft 28 facing the longitudinal direction of the joint case 21 has two bearing members (ball bearings) 29 arranged in the front-rear direction in front of the insertion portion 24. The shaft 30 is rotatably supported in a state of being prevented from being detached by 30. A bevel-shaped first gear 31 is integrally provided at the front portion of the first rotary shaft 28, and is inserted into the operation rod 2 at the rear portion of the first rotary shaft 28. A joint 32 for connecting to the spline shaft at the tip of the driving force transmission shaft is integrally connected.

  Further, as shown in FIGS. 5 and 6, the first right side surface of the front portion of the joint case 21 projects in a cylindrical shape in the direction orthogonal to the first rotation shaft 28, that is, in the left-right direction. The protruding portion 33 is integrally formed. The cutting blade support case 22 can be rotated in the joint case 21 by inserting a third protrusion 43 of the cutting blade support case 22 described later into the first protrusion 33 so as to be slidable. It has come to be connected to.

  Further, an annular first flange surface portion 34 having an enlarged diameter in the outer peripheral direction is integrally provided at the distal end portion of the first projecting portion 33, and the first flange surface portion 34 is provided. As shown in FIGS. 5 to 8, a plurality of triangular prism-shaped projections 35 extending radially toward the cutting blade support case 22 are radially arranged as part of the meshing means. These protrusions 35 are formed at positions on the circumference of the fixed shaft 50 to be described later, and are formed so that the tip corners 35a face inward. Further, the front end portions 35a and the outer corner portions 35b and 35c are chamfered. The protrusion 35 is not limited to a triangular prism, and may be a polygonal column such as a quadrangular column or a V-shape.

  Furthermore, a pair of angle regulating members 36a and 36b for indicating an appropriate cutting angle of the cutting blade 3, that is, an appropriate rotation range of the cutting blade support case 22, is provided on the outer peripheral portion of the first flange surface portion 34. Are integrally projected with an interval of about 180 degrees. Between these angle restricting members 36a and 36b, a flange portion 37 that is curved along the outer peripheral portion is integrally formed between the angle restricting members 36a and 36b facing upward. A cutout portion 38 is provided at a substantially middle portion.

  In addition, a contact member 39 (shown in FIGS. 5 and 9) provided on the cutting blade support case 22 is provided between the angle restricting members 36 a and 36 b facing downward on the outer peripheral portion of the first flange surface portion 34. It is arranged so that it can reciprocate along. Furthermore, the contact member 39 has a shape that can be fitted into the notch 38.

  If the angle restricting members 36a and 36b are not provided, the cutting blade support frame 22 can be rotated 360 degrees with respect to the joint case 21 due to the structure.

  Arrangement of the contact member 39 between the angle restriction members 36a and 36b facing the lower side is suitable for the cutting operation. As shown in FIG. 10A, the contact member 39 is the angle restriction member. When in contact with 36a, the cutting blade 3 is maximally upward. In this state, the cutting blade support frame 22 rotates about 48 degrees counterclockwise with respect to the substantially horizontal joint case 21.

  Further, as shown in FIG. 10B, when the contact member 39 is in contact with the angle regulating member 36b, the cutting blade 3 is maximally downward. In this state, the cutting blade support frame 22 rotates about 84 degrees clockwise with respect to the substantially horizontal joint case 21.

  On the other hand, as shown in FIG. 10 (c), when the abutting member 39 is fitted in the notch 38, it is suitable for shortening the overall length of the machine body during storage or packing. The cutting blade support frame 23 is rotated about 180 degrees counterclockwise with respect to the substantially horizontal joint case 21. The procedure for fitting the contact member 39 into the notch 38 will be described later.

  As shown in FIGS. 5 and 6, on the left side surface of the front part of the joint case 21, there is a second protrusion 40 that protrudes in a cross-sectional hat shape toward a side different from the first protrusion 33. It is integrally formed. In the center of the second projecting portion 40, a through hole 41 is formed through which a shaft end portion of a fixed shaft 50, which will be described later, penetrates in a slidable manner.

Next, the cutting blade support case 22 will be described.
As shown in FIGS. 5 and 6, the above-described contact member 39 projects from the left side portion of the cutting blade support case 22 toward the joint case 21, and the inside of the first projecting portion 33. A cylindrical third projecting portion 42 that is inserted in a slidable manner is integrally formed. Furthermore, on the base side of the third projecting portion 42, a stepped portion 43 for expanding the diameter of the base side rather than the distal end portion side, and a second flange facing the first flange surface portion 34 of the joint case 21. A surface portion 44 is formed.

  The stepped portion 43 can be brought into contact with the first flange surface portion 34. When the stepped portion 43 is in contact with the first flange surface portion 34, it can be moved only in the direction in which the cutting blade support case 22 is detached from the joint case 21.

  In addition, when the stepped portion 43 and the first flange surface portion 34 are joined to each other, the second flange surface portion 44 is disposed so as to face the first flange surface portion 34 with an appropriate distance therebetween. In the flange surface portion 44, a ring gear portion 45 as a part of meshing means that can mesh with the projection portion 35 and that can be joined to the first flange surface portion 34 is located on the circumference of the rotating shaft 50 described later. (See FIGS. 6 and 7). As shown in FIGS. 10A to 10C, every other protrusion 35 is engaged with the tooth groove of the ring gear portion 45.

  As shown in FIG. 5, a second rotating shaft 46 extending in a direction perpendicular to the first rotating shaft 28 is provided inside the third protrusion 42 via a bearing member (needle bearing) 47. And is pivotally supported. A bevel-shaped second gear 48 detachably meshed with the first gear 31 is integrally provided at the left end portion of the second rotating shaft 46. When the second gear 48 and the first gear 31 are meshed with each other, the side end surface of the ring gear portion 45 is surface-joined to the first flange surface portion 34, so that the positional accuracy is higher than when using the star seat. Improvement is planned. In addition, the meshing adjustment of the 1st gearwheel 31 and the 2nd gearwheel 48 is made | formed by making the step part 43 into a cutting surface.

  The outer diameter of the second gear 48 is smaller than the inner diameter of the first protrusion 33, and the second gear 48 can be inserted through the first protrusion 33. . On the other hand, a beveled third gear 49 having a smaller diameter than the second gear 48 is integrally formed at the right end portion of the second rotation shaft 46.

  Further, the second rotation shaft 46 is a hollow shaft, and a fixed shaft 50 is installed in the interior thereof so as not to rotate between the joint case 21 and the cutting blade support case 22. The fixed shaft 50 is a part of the contact / separation means, and the right shaft portion of the fixed shaft 50 is inserted into a recess 51 provided on the right side surface portion of the cutting blade support case 22 and is inserted into a recess 51 to prevent rotation. Is supported and fixed in a state in which rotation is prevented.

  Further, the left shaft portion of the fixed shaft 50 is slidably supported by the joint case 21 with its shaft end portion protruding outside from the through hole 41 of the joint case 21. Furthermore, a screw portion 53 having an appropriate length is provided on the left shaft portion of the fixed shaft 50, and a knob nut 54, which is a nut member of the contact / separation means, is screwed into the screw portion 53.

  A second rotating shaft 46 is rotatably supported on the outer peripheral surface of the central portion of the fixed shaft 50 via bearing members (needle bearings) 55 and 56 arranged in parallel on the left and right sides. An annular flange portion 57 that integrally prevents the left end portion side (second gear 48 side) of the rotary shaft 46 is integrally formed. Further, a retaining ring 58 is fitted to prevent the right end portion (the third gear 49 side) of the second rotating shaft 46 from coming off.

  A third rotating shaft 59 extending in a direction orthogonal to the fixed shaft 50 is rotatably supported in the cutting blade support case 22 via bearing members (ball bearings) 60 and 61. Yes. A bevel-shaped fourth gear 62 that is always meshed with the third gear 49 is spline-fitted to the shaft end of the third rotating shaft 59 adjacent to the fixed shaft 50 and fixed by a retaining ring 63. Has been. An eccentric cam shaft 66 for reciprocating a pair of upper and lower connecting rods 64, 65 connected to the base end portion of the cutting blade 3 is integrally provided on the other shaft portion of the third rotating shaft 59. ing.

  Thereby, after the rotational driving force of the driving force transmission shaft for transmitting the engine driving force is transmitted to the first rotating shaft 28, it is bent by about 90 degrees by the first and second gears 31, 48 and the second rotational shaft 28 is bent. The rotational driving force transmitted to the rotation shaft 46 and transmitted to the second rotation shaft 46 is bent by about 90 degrees by the third and fourth gears 49 and 62 and transmitted to the third rotation shaft 59. The cutting blade 3 reciprocates when the eccentric cam shaft 66 connected to the third rotating shaft 59 reciprocates the connecting rods 64 and 65 relative to each other.

  Reference numerals 67 and 68 in FIG. 5 are grease nipples for injecting lubricating grease into the cutting blade support case 22.

  In addition, a gripping portion 70 for facilitating the rotation of the cutting blade support case 22 is screwed to the cutting blade support case 22 via a flange portion 69 (see FIGS. 1 to 3).

Next, the angle adjustment unit 23 will be described.
The angle adjusting unit 23 is a contact / separation unit that allows the joint case 21 and the cutting blade support case 22 to be connected to and separated from each other in a direction orthogonal to the longitudinal direction of the operation rod 2, and the joint case 21 and the cutting blade support case 22 are opposed to each other. And a concave-convex meshing means that regulates the rotation of the cutting blade support case 22 by meshing in a direction perpendicular to the longitudinal direction of the operation rod 2.

  Specifically, the angle adjusting unit 23 is installed between the joint case 21 and the cutting blade support case 22 so as to be orthogonal to the first rotation shaft 28 as an approach / separation unit. Is supported in a slidable manner and is rotated in a state where it is engaged with a fixed shaft 50 fixedly supported so as not to rotate on the cutting blade support case 22 and a screw portion 53 formed at the shaft end of the fixed shaft 50. Thus, the knob nut 54 that moves the fixed shaft 50 forward and backward, and the flange 57 of the fixed shaft 50 and the joint case 21 are interposed between the cutting blade support case 22 and the joint case 21 so as to be always urged. And a biasing spring 71 as a biasing means.

  Furthermore, the engagement means is provided on the circumference of the fixed shaft 50 and provided between the first and second flange surface portions 34 and 44 as opposed surfaces of the joint case 21 and the cutting blade support case 22. A triangular columnar or V-shaped projection 35 and a ring gear 45 that regulate the rotation of the cutting blade support case 22 by meshing the surfaces in a direction perpendicular to the longitudinal direction of the operation rod 2. ing.

  Further, as shown in FIG. 5, a cap nut 72 is fixedly attached to the left end portion of the fixed shaft 50. The cap nut 72 restricts the rotation of the knob nut 54 so that the cutting blade support case 22 does not fall out of the joint case 21 even if the operator carelessly loosens the knob nut 54 to the maximum. It is carried out.

  Further, a washer 73 is disposed between the joint case 21 and the knob nut 54, and a washer 74 is also disposed between the joint case 21 and the biasing spring 70.

  In the state shown in FIG. 5, when the knob nut 54 is turned in the anti-tightening direction, that is, in the loosening direction, the fixed shaft 50 pressed by the urging force of the urging spring 71 is moved to the right side in FIG. The case 22 slides toward the direction of detachment from the joint case 21. Accordingly, the cutting blade support case 22 main body also moves in a direction to detach from the joint case 21. When the knob nut 54 is further rotated in the direction of further loosening, the engagement between the protrusion 35 and the ring gear 45 is eventually released. When the engagement between the projection 35 and the ring gear 45 is released, the cutting blade support case 22 has an abutment member 39 at an angle as shown in FIGS. 10 (a) and 10 (b). It can be rotated around the first protrusion 33 within a range where it comes into contact with the regulating member 36a or 36b.

  By the way, as shown in FIG. 10C, in order to rotate the cutting blade support case 22 about 180 degrees with respect to the joint case 21, the contact member 39 of the rotating cutting blade support case 22 is angle-regulated. It is necessary to rotate the knob nut 54 in such a direction as to further loosen it so as not to contact the members 36a and 36b. When the engagement between the projection 35 and the ring gear 45 is released, the knob nut 54 is loosened while holding the gripping part 69 and the like by hand so that the cutting blade support case 22 does not rotate. The blade support case 22 is slid. Then, the knob nut 54 is further rotated in the direction of further loosening, and the cutting blade support case 22 is slid in the direction away from the joint case 21 so that the contact member 39 does not contact the angle restricting members 36a and 36b. Accordingly, the cutting blade support case 22 can be rotated about 360 degrees with respect to the joint case 21.

  When the cutting blade support case 22 is in a rotatable state, the sliding amount of the fixed shaft 50, that is, the screw is set so that the third protrusion 42 does not fall out of the first protrusion 33. The length of the part 53 is set.

  At this time, the joint case 21 and the cutting blade support case 22 are connected by the first and third projecting portions 33 and 42 and the fixed shaft 50, while the second gear 48 is connected to the first gear 31. It disengages and is located inside the first protrusion 33.

  And when fixing the cutting blade support case 22 rotated only by a desired angle, the knob nut 54 may be rotated in the tightening direction. When the knob nut 54 is rotated in the tightening direction, the fixed shaft 50 slides toward the joint case 21 against the urging force of the urging spring 71. The rotation of the cutting blade support case 22 is restricted when the projection 35 and the ring gear portion 45 begin to engage with each other, and the sliding movement of the cutting blade support case 22 causes the side surface of the ring gear portion 45 to be the first flange. The process ends at the time of contact with the surface portion 34 (also when the stepped portion 43 contacts the first flange surface portion 34). Thus, as shown in FIGS. 11A to 11C, the cutting blade support case 22 rotated by a desired angle is fixed to the joint case 21, thereby fixing the cutting blade 3 to the desired angle. Can do.

  When the second gear 48 meshes with the first gear 31, the side end surface of the ring gear portion 45 is surface-bonded to the first flange surface portion 34, so that the positional accuracy is improved as compared with the case where a star seat is used. .

  As described above, even if the knob nut 54 that joins the joint case 21 and the cutting blade support case 22 is loosened, as long as the projection 35 and the ring gear portion 45 are engaged with each other, the cutting blade support case 22 is provided. Is restricted. That is, the cutting blade support case 22 does not rotate unless the knob nut 54 is loosened and the joint case 21 and the cutting blade support case 22 are separated from each other until the projection 35 and the ring gear portion 45 are not engaged with each other. Thereby, it is possible to provide a high pruning machine in which the angle of the cutting blade does not change during the operation of cutting low plants and high branches.

  Furthermore, the most part of the angle adjustment part 23 except the knob nut 54 is disposed between the opposing surfaces of the joint case 21 and the cutting blade support case 22 or in the cutting part main body 20, thereby reducing the size of the cutting part main body 20. In addition, the cost can be reduced by downsizing the constituent members.

  Further, when the joint case 21 and the cutting blade support case 22 are coupled by the knob nut 54, the ring gear portion 45 is surface-bonded to the first flange surface portion 34 of the joint case 21 that is opposed to the joint case 21, so that the Kikuza is used. As a result, the positional accuracy can be improved.

It is a top view of the cutting part main body in the high pruning machine of this invention. It is a side view of the cutting part main body. It is a sectional side view of the cutting part main body of FIG. It is A arrow directional view in FIG. It is a plane sectional view of the cutting part main body. It is a disassembled perspective view of the connection part of the joint case and cutting blade support case in the example. It is a perspective view of the 1st and 2nd flange surface part in the example. It is a side view at the time of seeing the joint case from the cutting blade support case side. It is a side view at the time of seeing the same blade support case from the joint case side. (A), (b) is the schematic diagram of the cutting part main body which showed the range suitable for a mowing operation | work, (c) is the schematic diagram of the cutting part main body suitable at the time of accommodation and packing. (A) is a side view of a cutting unit main body with the cutting blade facing upwards as much as possible in a range suitable for cutting work, and (b) is a cutting part main body with the cutting blades facing downward as much as possible in a range suitable for cutting work. (C) is a side view of a cutting part main body suitable for storage and packaging. It is a perspective view of the conventional high pruning machine. It is a side view of the cutting part main body in the conventional high pruning machine.

Explanation of symbols

2 Operating rod 3 Cutting blade 20 Cutting portion main body 21 Joint case 22 Cutting blade support case 23 Angle adjusting portion 35 Protruding portion (meshing means)
45 Ring gear (meshing means)
50 Fixed shaft (contact / separation means)
53 Screw part 54 Knob nut (contact / separation means)
71 Biasing spring (Biasing means)

Claims (4)

A high-pruned cutting, in which a cutting part body that reciprocates a cutting blade by converting a rotational driving force into a reciprocating driving force is detachably attached to the tip of an operating rod in which a driving force transmission shaft for transmitting an engine driving force is inserted. In the machine
The harvester body is
A joint case connected to the operation rod;
A cutting blade support case that is continuous with the cutting blade and is rotatably connected to the joint case;
An angle adjusting unit that is disposed across the joint case and the cutting blade support case and fixes the cutting blade at a desired angle by fixing the cutting blade support case to the joint case; ,
The angle adjuster is
Contact / separation means for enabling the joint case and the cutting blade support case to be contacted / separated in a direction perpendicular to the longitudinal direction of the operation rod;
Concave-engagement engagement means provided between the opposing surfaces of the joint case and the cutting blade support case, which regulates the rotation of the cutting blade support case by meshing in a direction perpendicular to the longitudinal direction of the operating rod. And a high pruning machine. The contacting / separating means includes
One end portion is fixedly supported by the cutting blade support frame, and the other end portion is slidably supported by the joint case in a state of passing through the joint case, and a fixed shaft on which a screw portion is formed,
An urging means interposed between the fixed shaft and the joint case, for urging the joint case and the cutting blade support case away from each other;
2. A nut member capable of moving the fixed shaft forward and backward to engage and disengage the joint case and the cutting blade support case by engaging with a screw portion of the fixed shaft. The high pruning machine described in 1.   The said meshing means is provided with the polygonal column-shaped or V-shaped projection part extended toward the direction orthogonal to the longitudinal direction of the said operating rod, and a ring gear part, The Claim 1 or 2 characterized by the above-mentioned. The described high pruning machine.   4. The high pruning machine according to claim 3, wherein the polygonal columnar projection or the ring gear portion is surface-joined to an opposing surface portion of the joint case or the cutting blade support case.

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