JP2016049082A - Cutting blade unit and clipper type cutting blade device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance maintainability.SOLUTION: A device comprises: a pair of clipper blades 53, 54; a cutter guide 51 having a cover part 51b and an attachment part 51a; a lower plate 52; connection means 70; and a transmission unit 60 that is attached to the cutter guide 51 and is connected to an intermediate part of the pair of clipper blades 53, 54 in a longitudinal direction in an insertable/extractable manner in a thickness direction, and that transmits drive force in the longitudinal direction to at least one of the pair of clipper blades 53, 54 so that one of the pair of clipper blades 53, 54 reciprocates with respect to the other.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a cutting blade unit and a clipper type cutting blade device.

  In order to improve the efficiency of mowing and pruning, a cutting blade device has been developed. As a type of cutting blade device, a clipper type that reciprocates in the longitudinal direction by stacking a disc-shaped cutting blade device that rotates a disk-shaped cutting blade and a pair of long plate-shaped cutting blades in the thickness direction. A cutting blade device is known. In the disk-type cutting blade device, the cutting blade is a rotating body, so there are many safety problems. On the other hand, the clipper-type cutting blade device has a configuration in which the blade reciprocates with a short stroke, and thus the safety is higher than that of a disk type. However, in a commercially available clipper type cutting blade device that is currently in practical use, an operating rod is connected to one end of the cutting blade in the longitudinal direction, and the cutting blade is configured to protrude long from the end of the operating rod. ing. In such a configuration, the labor for shaking the cutting blade during operation increases, and the burden on the operator increases. On the other hand, as disclosed in Patent Documents 1 and 2, in the clipper type cutting blade device in which the central part of the cutting blade is connected to the operating rod, the cutting blade can be operated along the longitudinal direction of the operating rod. it can.

  In order to connect the cutting blade and the operating rod, in Patent Document 1, a support frame that is stacked in the thickness direction with the cutting blade is provided. The support frame has a plurality of round holes through which bolts are inserted. In each cutting blade, a plurality of long holes communicating with the respective round holes of the support frame are formed along the longitudinal direction. Therefore, by inserting a bolt for each round hole of the support frame and inserting each bolt through a long hole of the cutting blade corresponding to each round hole, each cutting blade is in a state in which movement in the width direction is restricted, Along the longitudinal direction, it is connected to the support frame so as to be relatively displaceable.

  Moreover, in patent document 2, in order to connect a cutting blade and an operating rod, one cutting blade is made into the fixed blade, and is integrated with the operating rod. The fixed blade is provided with a plurality of circular bolt holes, through which bolts are inserted. Further, the other cutting blade (movable blade) stacked on the fixed blade is formed with a long hole through which each bolt is inserted in the longitudinal direction. The bolt penetrates a holding plate laminated on the side opposite to the fixed blade of the movable blade and is fixed by the fixture. Therefore, the movable blade is connected to the fixed blade so as to be relatively displaceable along the longitudinal direction in a state where movement in the width direction is restricted by the bolt.

Japanese Patent Laid-Open No. 7-147827 Japanese Utility Model Publication No. 3-27914

  In the prior art described above, a round hole is provided in a member (support frame, fixed blade) integrated with the operating rod, a long hole is provided in a cutting blade that moves relative to the member, and a bolt is inserted. It was only there. Therefore, when replacing the cutting blade, it is necessary to remove all the bolts from the cutting blade and disassemble the fixing member.

  However, such a cutting blade replacement operation is very time-consuming and has a heavy burden on the user. On the other hand, the life of the cutting blade is very short. For example, when a pruning operation is performed on soil containing quartz with high hardness, the life of the cutting blade may be exhausted in several hours. Therefore, it is necessary for the user to frequently perform the cutting blade replacement work, and the utility is low in terms of maintenance.

  This invention is made | formed in view of the subject mentioned above, and makes it a subject to provide the cutting blade unit and clipper-type cutting blade apparatus which can improve maintainability.

  In order to solve the above-described problems, the present invention has a base material formed in a rectangular plate shape and a plurality of blade portions projecting from the long side of the base material, and is overlapped in the thickness direction. A pair of clipper blades, a rectangular plate that covers the base material, a cover portion that is disposed on one side in the thickness direction of the pair of clipper blades, and a longitudinally non-end portion of the cover portion. A cutter guide having a mounting portion to which an operation rod is attached, a plate formed in a rectangular plate shape covering the base material, and disposed on the other end in the thickness direction of the pair of clipper blades, and the pair A plurality of connecting members for connecting the clipper blade and the plate to the cutter guide, and one operating member capable of releasing the connecting state of the connecting member, and the connecting state by the connecting member by the one operating member. To release And a connecting means configured to be able to remove the plate and the pair of clipper blades from the cutter guide in the thickness direction, and a longitudinal intermediate portion of the pair of clipper blades in the thickness direction. A transmission unit that is connected so as to be insertable / removable and that transmits at least one of the pair of clipper blades to a longitudinal direction so that one of the pair of clipper blades reciprocates relative to the other; A cutting blade unit characterized by the above. In this aspect, the cutter guide connects the operating rod to the middle portion in the longitudinal direction of the pair of clipper blades, and the transmission unit reciprocates the clipper blades of the pair of clipper blades, so that the operator moves the operating rod back and forth. Just pruning can be done. Therefore, workability is improved. In addition, since the pair of clipper blades can be attached to and detached from the cutter guide by the attachment / detachment operation of one connecting member, the maintenance work and the exchange work of the pair of clipper blades are greatly facilitated. Moreover, since the transmission unit is connected to the pair of clipper blades so as to be insertable / removable in the thickness direction with respect to the intermediate portion in the longitudinal direction of the pair of clipper blades, when the pair of clipper blades are attached / detached The attachment / detachment operation of the pair of clipper blades and the transmission unit can be easily performed together. Therefore, a pair of clipper blades can be easily replaced and maintained by operating one connecting member. In addition, the “longitudinal non-end portion” means a portion or position on the center side excluding both end portions in the longitudinal direction, and includes a portion or position shifted from the center in the longitudinal direction to either one of the longitudinal directions from the center. .

  In the cutting blade unit according to a preferred aspect, the transmission unit is connected to one of the pair of clipper blades so as to be insertable / removable in the thickness direction, and to the other of the pair of clipper blades, A second transmission body connected to be insertable / removable in the thickness direction, wherein the first transmission body and the second transmission body have a corresponding clipper blade in a direction opposite to the counterpart clipper blade. It is comprised so that motive power may be output so that it may reciprocate. In this aspect, since the pair of clipper blades can be simultaneously driven in opposite directions, the vibration generated in one of the clipper blades can be canceled by the other clipper blade, and the vibration can be reduced overall.

  In the cutting blade unit according to a preferred aspect, the first transmission body and the second transmission body each have a protrusion protruding in the width direction of the pair of clipper blades, The engaging part which engages / disengages the protrusion of the transmission body corresponding to is in the thickness direction is formed. In this aspect, it is possible to configure a connecting structure that is easy to attach and detach between the pair of clipper blades and the corresponding first and second transmission bodies with a very simple configuration.

  In the cutting blade unit according to a preferred aspect, the first contour line formed by the protrusion of the first transmission body and the engaging portion with which the protrusion engages, and the protrusion of the second transmission body and the protrusion are engaged. The positions of the protrusion and the engaging portion are set so that the second contour line formed by the engaging portion avoids crossing each other in the entire stroke range in which the pair of clipper blades reciprocate. In this aspect, the first contour line formed between the projection of the first transmission body and the engaging portion with which the projection engages, and the engagement with which the projection of the second transmission body and the projection engage. The second contour line formed between the joint portions does not overlap. As a result, for example, a step caused by an error in the thickness dimension of the clipper blade or the first transmission body or the second transmission body corresponding to the clipper blade occurs in the first contour line or the second contour line. Even in this case, it is possible to effectively prevent the reciprocation of the pair of clipper blades from being hindered by the catch caused by these steps.

  In the cutting blade unit according to a preferred aspect, the pair of clipper blades is composed of a pair of blades of the same specification formed in a rectangular plate shape, and the pair of blades is one blade. Are turned around the center line along the width direction of the blade and overlapped with the other blade in the thickness direction to constitute the pair of clipper blades, and the first transmission member and the second transmission member. Each protrusion of the body is arranged symmetrically with respect to the center line, and either one of the first transmission body and the second transmission body is engaged with the set of two blades. A concave portion that constitutes the engaging portion to be combined, and an insertion concave portion that is disposed at a position symmetrical to the engaging portion with respect to the center line and that is wider than the concave portion are formed. In this aspect, since a pair of clipper blades can be configured by combining two blades having the same specification, a manufacturing cost of the clipper blades can be reduced. Also, when maintaining a pair of clipper blades or replacing one of the clipper blades, the pair of clipper blades can be easily removed from the cutter guide by releasing the lock by the operating member of the connecting means, and the replacement work and maintenance. Work can be performed.

  According to another aspect of the present invention, the cutting blade unit, an operating rod connected to the cutter guide of the cutting blade unit via the mounting portion, and a drive for transmitting power to the transmission unit of the cutting blade unit A clipper-type cutting blade device comprising a power source. In this aspect, the pruning operation can be performed by driving the cutter guide in the front-rear direction of the operator with the operating rod. In addition, when performing maintenance of the clipper blade or replacing the clipper blade, the pair of clipper blades can be easily removed from the cutter guide by releasing the lock by the operation member of the connecting means, and the replacement work and maintenance work can be performed. Can do.

  As described above, according to the present invention, since the operating rod is connected to the middle portion in the longitudinal direction of the pair of clipper blades by the cutter guide, the pruning operation is facilitated and the burden on the operator is reduced. . In addition, since the connecting means can perform the attaching / detaching operation of the pair of clipper blades by operating one operating member, the operability is improved. In addition, since the transmission unit is connected to the middle part in the longitudinal direction of the pair of clipper blades so as to be insertable / removable in the thickness direction, the connection state by the connecting means is released to transmit the pair of clipper blades. It can also be detached from the unit. Therefore, according to the present invention, there is a remarkable effect that the maintainability can be improved.

  Further features, objects, configurations, and advantages of the present invention will be readily understood from the following detailed description that should be read in conjunction with the accompanying drawings.

It is explanatory drawing which shows the usage example of the cutting blade apparatus which shows one Embodiment of this invention. FIG. 2 is a schematic front view of a cutting blade unit used in the cutting blade device of FIG. 1. It is a longitudinal cross-sectional view of the cutting blade unit of FIG. It is a disassembled perspective view which shows the principal part of the cutting blade unit of FIG. The blades employ | adopted as the cutting blade unit of FIG. 2 are shown, (A) is a front view, (B) is a rear view. FIG. 6 is an enlarged partial view showing a main part when a pair of clipper blades are configured by superimposing two blades of FIG. 5 in pairs. It is a disassembled perspective view which shows the relationship between a pair of clipper blade employ | adopted as the cutting blade unit of FIG. 2, and a transmission unit. FIG. 3 is an exploded view showing a positional relationship between a pair of clipper blades and a transmission unit employed in the cutting blade unit of FIG. 2. 2 shows a process for disassembling the cutting blade unit of FIG. 2, (A) is an explanatory view showing a state in which a C-shaped retaining ring as an operation member is detached, and (B) is a pair after removing the C-shaped retaining ring. It is explanatory drawing which shows the state which displaced the braid | blade relatively. It is a disassembled perspective view which shows the replacement | exchange process of the cutting blade unit of FIG. The other blade | blade employable to this invention is shown, (A) is a front view, (B) is a rear view.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  First, with reference to FIG. 1 and FIG. 2, the cutting blade apparatus 1 which concerns on this embodiment is an example of the clipper type cutting blade apparatus with which an operator operates the operating rod 2 manually. In the following description, it is assumed that the front of the operator is the front of the entire apparatus, the front of the operator is the base end side of the apparatus, and the opposite side is the front end side.

  The operation rod 2 is a rod-shaped cylindrical body. A drive source 3 such as an engine is provided on the base end side of the operation rod 2. A crankcase 4 is attached to the tip of the operation rod 2. The output of the drive source 3 is output to a drive shaft (not shown) provided inside the operation rod 2. The tip end of the drive shaft is connected to a gear mechanism in the crankcase 4. The gear mechanism transmits power to the transmission shaft 5 arranged at the proximal end portion of the crankcase 4. The transmission shaft 5 is vertically supported in the crankcase 4. A pair of cranks 6 and 7 are arranged at the lower part of the transmission shaft 5. Each of the cranks 6 and 7 is formed of a disk body that is disposed up and down and is eccentric with respect to the transmission shaft 5. One crank 6 and the other crank 7 are fixed to the transmission shaft 5 with a phase difference of 180 degrees.

  Referring to FIGS. 3 and 4, an upper crank arm 8 is connected to the upper crank 6. A lower crank arm 9 is connected to the lower crank 7. Each of the crank arms 8 and 9 transmits power to the cutting blade unit 50 via a transmission unit 60 described later. Each of the crank arms 8 and 9 is a plate-like member that integrally has an oval portion that engages the cranks 6 and 7 with the base end portion, and an output portion on the distal end side. The crank arms 8 and 9 are arranged so as to overlap each other vertically, and a middle part in the front-rear direction is pivotally supported by a fulcrum bolt 10 that protrudes upward from the lower part of the crankcase 4. The fulcrum bolt 10 functions as a swing center for swinging the crank arms 8 and 9 when the crank arms 8 and 9 receive the rotational force from the corresponding cranks 6 and 7. A spacer 11 is disposed on the outer periphery of the fulcrum bolt 10. The spacer 11 functions as a bearing that secures a spacing between the crank arms 8 and 9 and performs a smooth swinging motion of the crank arms 8 and 9.

  As shown in FIG. 4, a long hole 8 a is formed on the base end side of the upper crank arm 8. The long hole 8a is formed in a circular arc shape centering on the fulcrum bolt 10 and along an arc having a predetermined length radius. In the long hole 8a, a first connecting bolt 12 protruding from the lower crank arm 9 is guided in the circumferential direction. The first connecting bolt 12 protrudes upward from the lower crank arm 9. The long hole 8a and the first connecting bolt 12 function as a node that converts the swing motion of the lower crank arm 9 into left and right reciprocating motion. A spacer 14 is disposed on the outer periphery of the first connecting bolt 12. The spacer 14 is fitted to each crank arm 8, 9 and functions as a bearing that smoothly receives the relative displacement of each crank arm 8, 9.

  The cutting blade unit 50 includes a T-shaped cutter guide 51 in plan view, a lower plate 52, a pair of clipper blades 53 and 54, a sliding plate 56, a transmission unit 60, and a connecting mechanism 70 as a connecting means. I have.

  The cutter guide 51 is a plate-like sheet metal member that is disposed at the top of the crankcase 4 and integrally includes a mounting portion 51a that extends forward and a cover portion 51b that extends from the tip of the mounting portion 51a. The attachment portion 51a is a plate-like portion having a substantially rectangular shape in plan view extending in the front-rear direction. The fulcrum bolt 10 is inserted in the vicinity of the base end side of the mounting portion 51 a, and is fastened together with the crankcase 4 by the nut 15 screwed to the fulcrum bolt 10 and integrated with the crankcase 4. . In addition, as shown in FIG. 3, the cutter support 16 is attached to the upper part of the attachment part 51a. The cutter support 16 is fixed to the upper surface of the attachment portion 51a by a bolt 17 and a nut 18 that are inserted from below the attachment portion 51a, and the fulcrum bolt 10 and the nut 15. The cutter support 16 functions as an exterior part that covers the upper surface of the cutter guide 51 and reinforces the mechanical structure.

  Further, a long hole 51c for guiding the first connecting bolt 12 is formed in the vicinity of the tip portion of the mounting portion 51a. The first connection bolt 12 is connected to the attachment portion 51a by a nut 20 that is screwed from above the attachment portion 51a. The spacer 14 disposed on the outer periphery of the first connecting bolt 12 also functions as a bearing that guides the relative displacement between the first connecting bolt 12 and the mounting portion 51a. A washer 21 is interposed between the nut 20 and the attachment portion 51a.

  A long hole 51d concentric with the long hole 51c is formed slightly forward of the long hole 51c. The long hole 51 d is inserted through the second connecting bolt 22 that connects the transmission unit 60 and the upper crank arm 8, and the second connecting bolt 22 serves as the swing center of the upper crank arm 8. Guide the rocking around. The long hole 51d and the second connecting bolt 22 function as a node that converts the swing motion of the upper crank arm 8 into left and right reciprocating motion. A spacer 23 is disposed on the outer periphery of the second connecting bolt 22. The spacer 23 is interposed between the long hole 51d and the upper crank arm 8, and functions as a bearing that smoothly receives the swing of the upper crank arm 8.

  The cover part 51b of the cutter guide 51 is a rectangular plate-like part extending in the left and right directions in a plan view (see FIG. 2). The mounting portion 51a protrudes from the longitudinal end portion of the cover portion 51b. The cover 51 b functions as an exterior member that covers the clipper blades 53, 54 above the pair of clipper blades 53, 54. The longitudinal direction of the cover portion 51b is slightly longer than the clipper blades 53 and 54. In the longitudinal direction of the cover portion 51b, a plurality of insertion holes 51e are arranged symmetrically with respect to the center line O1 along the width direction at equal intervals. Stepped bolts 71 constituting the coupling mechanism 70 are inserted into the insertion holes 51e from below. A nut 72 is screwed into each stepped bolt 71 from the upper side of the cover portion 51b, and is fixed to the cutter guide 51 between the stud portion. A pin hole 51f is formed at an appropriate position of the cutter guide 51. One headed pin 73 is inserted into the pin hole 51f from below. A C-shaped retaining ring 74 is fixed to the upper end portion of the headed pin 73. The stepped bolt 71, the headed pin 73, and the C-shaped retaining ring 74 constitute a connecting mechanism 70 as a connecting means. The stepped bolt 71 and the headed pin 73 are examples of connecting members. The C-shaped retaining ring 74 is an example of an operation member.

  The lower plate 52 is disposed below the cutter guide 51 with the pair of clipper blades 53 and 54 and the sliding plate 56 interposed therebetween. The lower plate 52 is a sheet metal member having a rectangular shape in plan view extending long in the left-right direction. The lower plate 52 functions as an exterior member that covers the clipper blades 53 and 54 together with the cover portion 51 b below the pair of clipper blades 53 and 54. The longitudinal direction of the lower plate 52 is set to the same length as the cover portion 51b. That is, the longitudinal direction of the lower plate 52 is slightly longer than the clipper blades 53 and 54. The lower plate 52 is formed with a long hole 52a vertically opposite to each insertion hole 51e. Each of the long holes 52a extends along a straight line along the longitudinal direction of the lower plate 52, and is equally distributed at a predetermined interval. A stepped bolt 71 inserted through each insertion hole 51e is inserted. A large-diameter portion 52b is continuous with one end of each long hole 52a. The large diameter portion 52b opens to a size that allows the head 71a of the stepped bolt 71 to be inserted. At the time of assembly, the head 71 a of the stepped bolt 71 is locked to the lower surface of the lower plate 52. At the time of disassembling described later, the lower plate 52 is displaced in the longitudinal direction with respect to the cutter guide 51 (therefore, the stepped bolt 71), and the large diameter portion 52b is opposed to the head of the stepped bolt 71 to move downward. It can be pulled out.

  The lower plate 52 is formed with a pin hole 52c facing the pin hole 51f of the cutter guide 51. At the time of assembly, the headed pin 73 is inserted into the pin hole 52 c from below, and the head of the headed pin 73 is locked to the lower surface of the lower plate 52. In this state, the lower plate 52 is restricted from being displaced relative to the cutter guide 51 in the longitudinal direction. On the other hand, when the headed pin 73 is detached, the lower plate 52 can move relative to the cutter guide 51 in the longitudinal direction.

  Next, referring to FIG. 5, the clipper blades 53, 54 are embodied by combining two blades 55 having the same specifications. The blade 55 includes a base material 55a and a blade portion 55b, and is a plate member made of an alloy such as NKS steel. The base material 55a has a length of about 400 mm, for example, and is formed in a rectangle having a width of about 20 mm to 30 mm. A plurality of long holes 55c are formed in the base material 55a. Each of the long holes 55c extends along a straight line along the longitudinal direction of the base material 55a, and is equally distributed at a predetermined interval. Each long hole 55 c is formed to correspond to an insertion hole 51 e formed in the cover portion 51 b of the cutter guide 51 in order to insert the stepped bolt 71. A large-diameter portion 55d is continuous with one longitudinal end portion of each long hole 55c. The large diameter portion 55d opens to a size that allows the head 71a of the stepped bolt 71 to be inserted. Further, a pair of insertion long holes 55e is formed in the base material 55a. The insertion long hole 55e is used for insertion of the headed pin 73.

  A plurality of blade portions 55 b of the blade 55 are projected from one long side of the blade 55. The blade portions 55b are arranged along the longitudinal direction of the base material 55a, and protrude in the width direction from the one long side with a predetermined interval. The blade portion 55b has a trapezoidal shape with the tip side narrowed. On the front side of the blade 55, the peripheral edge of the blade portion 55b is tapered to form a sharp edge.

  The blade portion 55b is asymmetric in a state where the ½ interval is shifted in the center line O2 along the short side (width direction) of the blade 55. For this reason, when two blades 55 are prepared, and one of the blades 55 is rotated around the center line O2 and the respective back surfaces are superposed on each other, as shown in FIG. The 55 blade portions 55b are disposed between the blade portions 55b of the blade 55 disposed on the lower side, and the object to be cut interposed in the gap between them can be cut. Then, two blades 55 are made into a set and the back surfaces are overlapped as described above, whereby the upper blade 55 constitutes the upper clipper blade 53 and the lower blade 55 constitutes the lower clipper blade 54.

  As shown in FIG. 4, in the illustrated embodiment, the upper hair clipper blade 53 has a long hole 55 c and a large diameter portion 55 d at the time of assembly, a long hole 52 a and a large diameter portion 52 b of the lower plate 52, and a lower clipper blade 54. It is made to oppose with the long hole 55c. Here, in the upper clipper blade 53 and the lower clipper blade 54, the position of the large-diameter portion 55d with respect to the elongated hole 55c is opposite to the left and right. Therefore, when the lower clipper blade 54 is assembled, only the elongated hole 55c is opposed to the elongated hole 52a of the lower plate 52 and the elongated hole 55c of the upper clipper blade 53. Further, in the state where the stepped bolt 71 is inserted into the long hole 55c and the headed pin 73 is inserted into the insertion long hole 55e of each clipper blade 53, 54, each clipper blade 53, 54 is attached to the head. The relative displacement in the left-right direction is restricted by the stroke defined by the pin 73 and the insertion long hole 55e. Accordingly, the large diameter portion 55d of the upper clipper blade 53 and the large diameter portion 55d of the lower clipper blade 54 do not overlap each other. As a result, the stepped bolt 71 inserted through the long hole 55c is restricted from being detached, and the pair of clipper blades 53 and 54 are not disassembled. On the other hand, in the state in which the headed pin 73 is detached from the insertion long holes 55e of the clipper blades 53, 54, the upper clipper blade 53 and the lower clipper blade 54 overlap each other with the large diameter portions 55d. It becomes possible to displace from side to side relatively. Therefore, when both of them are overlapped, the pair of clipper blades 53 and 54 can be pulled out from the stepped bolt 71 to disassemble the clipper blades 53 and 54.

  Next, a recess 55f is formed on the other long side of the blade 55 (the long side opposite to the one long side where the blade 55b is formed). The recess 55f is an example of an engaging portion that engages and disengages projections 61b and 62b of transmission bodies 61 and 62, which will be described later, in the thickness direction. The contour of the recess 55f is widened so as to have a curved surface in which a part on the base end side is continuous with the other long side and the tip end is curved with a predetermined curvature. In the illustrated example, the concave shape of the recess 55f is formed symmetrically with respect to the center line O21 along the short side (width direction) of the blade 55. The recess 55f is provided at a position shifted from the center line O2 of the blade 55 to the other end side (the side opposite to the side where the large diameter portion 55d of the long hole 55c is formed as viewed from the front side). A deviation L1 is set between the center line O2 and the center line O21 of the recess 55f.

  Further, an insertion recess 55 g is formed on the other long side of the blade 55. The insertion recess 55g is formed at a position shifted from the center line O2 of the blade 55 to one end side (the side where the large diameter portion 55d of the long hole 55c is formed as viewed from the front side). Further, the insertion recess 55g is formed to have a somewhat larger diameter than the recess 55f. The shape of the insertion recess 55g is formed symmetrically with respect to the center line O22 along the short side (width direction) of the blade 55. The deviation L2 from the center line O2 to the center line O22 of the insertion recess 55g is set equal to the deviation L1. As described above, the lower clipper blade 54 is configured by turning over the blade 55 having the same specifications as the upper clipper blade 53 around the center line O2. Therefore, when assembling, when the end portions of the clipper blades 53 and 54 are aligned, the recess 55f of the upper clipper blade 53 faces the insertion recess 55g of the lower clipper blade 54, and the recess 55f of the lower clipper blade 54 is It faces the insertion recess 55g of the upper clipper blade 53.

  Next, referring to FIG. 7, the transmission unit 60 is for driving the upper clipper blade 53 and the lower clipper blade 54 in opposite directions along the longitudinal direction. The transmission unit 60 includes first and second transmission bodies 61 and 62.

  The first transmission body 61 is a power transmission member that connects the upper clipper blade 53 and the upper crank arm 8. The 1st transmission body 61 has the substantially rectangular base 61a and the projection part 61b integrally.

  The base 61a is a rectangular sheet metal member having a relatively short (for example, about 50 mm) long side and a short side that is about half of the long side (for example, about 21 mm). The thickness of the base 61a is set to the same dimension as the blade 55. In the illustrated example, the short sides are arranged along the front and back. An insertion hole 61c is formed in a substantially central portion of the base portion 61a. The insertion hole 61 c is a hole through which the second connecting bolt 22 is inserted. The second connecting bolt 22 passes through the first transmission body 61 from above the second transmission body 62 (see FIG. 3). Therefore, the 1st transmission body 61 and the 2nd transmission body 62 can displace relatively right and left.

  The protrusion 61b has a shape that undulates into a burrow shape. The protrusion 61b has a symmetrical shape having a curved surface with a predetermined curvature on the distal end side so as to fit the concave portion 55f when seen in a plan view. The protrusion 61b is fitted into a recess 55f formed in the blade 55. When the protrusion 61b and the recess 55f are fitted, the other long side of the blade 55 constituting the upper clipper blade 53 is connected in a state where one long side of the first transmission body 61 is joined. Is set to Furthermore, when the protrusion 61b and the recess 55f are fitted, the upper clipper blade 53 is allowed to be engaged and disengaged only in the thickness direction (vertical direction) with respect to the first transmission body 61, and is relative to the front, rear, left and right. They are connected in a non-displaceable state. For this reason, the force by which the upper crank arm 8 swings is transmitted to the first transmission body 61 via the second connecting bolt 22, converted into left and right parallel motion, and transmitted to the upper clipper blade 53. .

  As shown in the upper side of FIG. 8, the protrusion 61 b protrudes from a portion near one end in the left-right direction on one side of the base 61 a corresponding to the recess 55 f of the upper clipper blade 53. As a result, as shown on the upper side of FIG. 8, the shift amount L1 is set between the center line O3 along the short side (width direction) of the base 61a and the center line O31 of the protrusion 61b.

  The second transmission body 62 is a power transmission member that connects the lower clipper blade 54 and the lower crank arm 9. The second transmission body 62 integrally includes a substantially rectangular base 62a, a protrusion 62b protruding from one side of the base 62a, and an extension 62d protruding from the other side of the base.

  The base 62a is a rectangular sheet metal member having a relatively short (for example, about 50 mm) long side and a short side that is about half the long side (for example, about 19 mm). The thickness of the base 61a is set to the same dimension as the blade 55. In the illustrated example, the short sides are arranged along the front and back.

  The extension part 62d is set to have a dimension shorter on the left and right than the base part 62a, and extends from the base part 62a to the base end side. An insertion hole 62c is formed in a substantially central portion of the extension portion 62d. The insertion hole 62c is a hole through which the first connecting bolt 12 is inserted. At the time of assembly, the tip portion of the lower crank arm 9 is disposed on the extension 62d and is connected to the extension 62d (that is, the second transmission body 62) by the first connecting bolt 12.

  The protrusion 62b has a shape that undulates into a burrow shape. The protruding shape of the protrusion 62b is a symmetrical shape having a curved surface in which the tip side is curved with a predetermined curvature so as to fit the recess 55f when seen in a plane. Further, the protruding shape of the protrusion 62 b is set to the same shape and the same size as the protrusion 61 b of the first transmission body 61. Therefore, the protrusion 62 b matches the contour of the protrusion 61 b of the first transmission body 61 and fits into the recess 55 f of the blade 55. When the protrusion 62b and the recess 55f are fitted, the other long side of the blade 55 constituting the lower clipper blade 54 is connected with one long side of the second transmission body 62 joined thereto. Is set to Further, when the protrusion 62b and the recess 55f are fitted, the lower clipper blade 54 is allowed to be engaged and disengaged only in the thickness direction (vertical direction) with respect to the second transmission body 62, and relative to the front, rear, left and right. They are connected in a non-displaceable state. For this reason, the force by which the lower crank arm 9 swings is transmitted to the second transmission body 62 via the first connecting bolt 12, converted into left and right parallel motion, and transmitted to the lower clipper blade 54. .

  As shown on the lower side of FIG. 8, the protrusion 62 b protrudes from a portion near the other end in the left-right direction on one side of the base 62 a corresponding to the recess 55 f of the lower clipper blade 54. As a result, the shift amount L2 is set between the center line O4 along the short side (width direction) of the base 62a and the center line O41 of the protrusion 61b. This deviation amount L2 is set equal to the deviation amount L1 in the first transmission body 61.

  In FIG. 4, in order to clarify the correspondence between the respective parts, the first and second crank arms 8 and 9 are disassembled, and the first and second transmission bodies 61 and 62 corresponding thereto are The clipper blade 53 and the lower clipper blade 54 are depicted as being integrally connected to each other, but in actuality, the fulcrum bolt 10, the first connection bolt 12, the second connection bolt 22, etc. The second crank arms 8 and 9 and the first and second transmission members 61 and 62 are connected to the attachment portion 51a of the cutter guide 51 so as not to be separated (see FIG. 10).

  Here, the relationship between the blade 55 and the protrusions 61b and 62b formed on the first and second transmission members 61 and 62 will be described with reference to FIGS. In FIG. 8, the center line O2 of the upper clipper blade 53, the center line O3 of the first transmission body 61, the center line O2 of the lower clipper blade 54, and the center line O4 of the second transmission body 61 are overlapped on the same line. In a state where the upper clipper blade 53 and the first transmission body 61 are connected, the part where the upper clipper blade 53 and the first transmission body 61 are connected is disassembled, and the lower part where the lower clipper blade 54 and the second transmission body 62 are connected is disassembled. It is.

  With the above-described setting, the recess 55f of the upper clipper blade 53 and the protrusion 61b of the first transmission 61 are displaced from the center lines O2 and O3 in the width direction to the other end in the longitudinal direction of the blade 55 by a displacement amount L1. It is provided at a position and is detachably fitted in the thickness direction (vertical direction) of the blade 55. On the other hand, the recess 55f of the lower clipper blade 54 and the protrusion 62b of the second transmission body 62 are provided at positions shifted from the center lines O2 and O3 in the width direction to one end side in the longitudinal direction of the blade 55 by a shift amount L2, The blade 55 is detachably fitted in the thickness direction (vertical direction) of the blade 55. The deviations L1 and L2 are set equal. Therefore, as will be described later, when the pair of clipper blades 53 and 54 are assembled from the lower side, the projection 61b of the second transmission member 62 is inserted into the insertion recess 55g of the upper clipper blade 53, so that the first transmission member The protrusion 61 b of 61 can be engaged with the recess 55 f of the upper clipper blade 53. Further, the protrusion 61 b of the second transmission body 62 engages with the recess 55 f of the lower clipper blade 54. Further, the sum of the deviation amounts L1 and L2 is much longer than the stroke when the upper clipper blade 53 and the lower clipper blade 54 are relatively displaced. Therefore, the first contour line B1 formed by the projection 61b of the first transmission body 61 and the recess 55f with which the projection 61b engages, the projection 62b of the second transmission body 62, and the projection 62b. The second contour line B2 formed by the concaving recess 55f does not cross each other in the entire stroke range in which the pair of clipper blades 53 and 54 reciprocate.

  Furthermore, the recess 55f and the insertion recess 55g are set to a shape that does not overlap linearly when the upper and lower clipper blades 53 and 54 move relatively to the left and right. Therefore, there is no fear that the concave portion 55f and the insertion concave portion 55g that overlap vertically are engaged with each other.

  The sliding plate 56 is disposed between the cutter guide 51 and the upper clipper blade 53 and is integrally fixed to the cutter guide 51. The cutter guide 51 functions as a supporter that slides in contact with the clipper blade 53 and guides the reciprocating motion of the clipper blade 53 to lubrication. The sliding plate 56 is formed with a plurality of insertion holes 56a corresponding to the insertion holes 51e of the cutter guide 51 and one pin hole 56b corresponding to the pin hole 51f.

  Referring to FIGS. 4, 9, and 10, the coupling mechanism 70 is embodied by a stepped bolt 71, a nut 72, a headed pin 73, and a C-shaped retaining ring 74. The stepped bolt 71 and the headed pin 73 are examples of the connecting member of the present invention. The C-shaped retaining ring 74 is an example of the operation member of the present invention. As described above, the stepped bolt 71 is provided for each insertion hole 51e formed in the cutter guide 51, and is inserted through the sliding plate 56 from below and further through the insertion hole 51e of the cutter guide 51. The cutter guide 51 and the sliding plate 56 are tightened together with the nut 72 screwed into the upper part. A gap is interposed between the lower surface of the sliding plate 56 and the head 71a of the stepped bolt 71, and the pair of clipper blades 53, 54 and the lower plate 52 are connected in this order from the top in this order. The The headed pin 73 penetrates the lower plate 52, the lower clipper blade 54, the upper clipper blade 53, the sliding plate 56, and the cutter guide 51 in this order from the lower side, and the C-shaped retaining ring 74 covers the cutter guide 51. It is attached to the part 51b. The direction in which the pair of clipper blades 53 and 54 move to the left and right is relatively restricted by a long hole 55c through which the headed pin 73 is inserted. For this reason, in the state where the headed pin 73 is attached, the large diameter portion 55d of the upper clipper blade 53 does not overlap with the large diameter portion 55d of the lower clipper blade 54 in the vertical direction. Therefore, the pair of clipper blades 53 and 54 and the lower plate 52 are restricted by the head portion 71a of the stepped bolt 71 and cannot be detached.

  On the other hand, as shown in FIG. 9A, first, the upper clipper blade 53 and the C-shaped retaining ring 74 are detached from the headed pin 73 and the headed pin 73 is detached from the cutting blade unit 50. The lower plate 52 and the lower clipper blade 54 are displaced relative to each other, and as shown in FIG. 9B, the large diameter portions 52b and 25d can be overlapped. Thus, as shown in FIG. 10, the lower plate 52, the lower clipper blade 54, and the upper clipper blade 53 are removed in this order from the stepped bolt 71 to remove the lower plate 52, the lower clipper blade 54, and the upper clipper blade 53. Part of the blade unit 50 can be disassembled, and the pair of clipper blades 53 and 54 can be replaced or repaired.

  Next, the operation of this embodiment will be described.

  First, with reference to FIG. 1 and FIG. 2, in the cutting blade apparatus 1 provided with the cutting blade unit 50 of this embodiment, the longitudinal direction of a pair of clipper blades 53 and 54 is orthogonal to an operator's front-back direction. The pair of clipper blades 53 and 54 are assembled in the posture and reciprocate in opposite directions along the longitudinal direction. Therefore, the operator can prune the object to be cut (weeds, small trees, etc.) in front of the cutting blade unit 50 simply by pushing the operating rod 2 of the cutting blade device 1 forward. Therefore, the burden on the operator is dramatically reduced, and a safe pruning operation with less fatigue can be performed.

  When it becomes necessary to replace the pair of clipper blades 53, 54, the operator stops the apparatus 1, removes the C-shaped retaining ring 74 with a predetermined tool, and pulls out the headed pin 73 from the cutting blade unit 50. . As a result, the lower plate 52 and the pair of clipper blades 53 and 54 are removed from the cutter guide 51. The pair of clipper blades 53, 54 is replaced with a clipper blade 53, 54 formed of a new blade 55. After the replacement, the headed pin 73 is inserted from the lower side of the lower plate 52 of the cutting blade unit 50 and fixed with the C-shaped retaining ring 74. Thereby, the replacement work is completed, and the operator can perform the pruning work again.

  As described above, in the present embodiment, as shown in FIGS. 1 and 2, the cutter guide 51 moves the operating rod 2 to the non-end portion in the longitudinal direction of the pair of clipper blades 53 and 54 via the connecting portion 51a. Further, since the transmission unit 60 reciprocates the pair of clipper blades 53 and 54, the operator can perform the pruning operation only by moving the operation rod 2 back and forth. Therefore, workability is significantly improved compared to a configuration in which the operator swings the operating rod around the waist as in the rotary blade type cutting blade device. Further, the connecting mechanism 70 allows the pair of clipper blades 53 and 54 to be attached to and detached from the cutter guide 51 by pulling out the headed pin 73 by attaching and detaching one C-shaped retaining ring 74. Maintenance work and replacement work of the clipper blades 53 and 54 are greatly facilitated. Moreover, since the transmission unit 60 is connected to the pair of clipper blades 53 and 54 so as to be insertable / removable in the thickness direction with respect to the longitudinal end portions of the pair of clipper blades 53 and 54, When the clipper blades 53 and 54 are attached and detached, the attachment and detachment operation of the pair of clipper blades 53 and 54 and the transmission unit 60 can be easily performed together. Therefore, the pair of clipper blades 53 and 54 can be easily replaced and maintained by operating one stepped bolt 71 and headed pin 73.

  In this embodiment, as shown in FIGS. 4 and 7, the transmission unit 60 is connected to the upper clipper blade 53 (one of the pair of clipper blades 53, 54) so as to be insertable / removable in the thickness direction. The first transmission body includes a first transmission body 61 and a second transmission body 62 connected to the lower clipper blade 54 (the other of the pair of clipper blades 53 and 54) so as to be insertable / removable in the thickness direction. 61 and the second transmission body 62 are configured to output power so that the corresponding clipper blade 53 (54) reciprocates in the opposite direction with respect to the other clipper blade 54 (53). . That is, the first transmission body 61 converts the movement of the upper crank arm 8 oscillating by the rotation of the upper crank 6 into a left and right reciprocating movement. Further, the second transmission body 62 converts the movement of the lower crank arm 9 that swings by the rotation of the lower crank 7 into a left and right reciprocating movement. The crank 6 of the upper crank arm 8 and the crank 7 of the lower crank arm 9 rotate in a state where the phases are shifted by 180 °. Therefore, the first transmission body 61 and the second transmission body 62 output power so that the corresponding clipper blade 53 (24) reciprocates in the opposite direction with respect to the counterpart clipper blade 54 (23). To do. For this reason, in this embodiment, since a pair of clipper blades 53 and 54 can be simultaneously driven in the reverse direction, the vibration generated in one clipper blade 53 (24) is canceled by the other clipper blade 54 (23), Overall, vibration can be reduced.

  In the present embodiment, as shown in FIGS. 7 and 8, the first transmission body 61 and the second transmission body 62 are projections protruding in the width direction of the pair of clipper blades 53 and 54. Each of the pair of clipper blades 53, 54 has a protrusion 61b, 62b, and a recess serving as an engaging portion for engaging and disengaging the protrusion 61b (32b) of the transmission 61 (32) corresponding to each of the pair of clipper blades 53, 54 55f is formed. For this reason, in the present embodiment, a connecting structure that is very simple and easy to attach and detach is configured between the pair of clipper blades 53 and 54 and the first and second transmission members 61 and 62 corresponding thereto. It becomes possible to do.

  Further, in the present embodiment, the first contour line B1 formed by the projection 61b of the first transmission body 61 and the recess 55f with which the projection 61b is engaged, the projection 62b of the second transmission body 62, and this The projecting part 61b, the projecting part 62b, and the second contour line B2 formed by the recessed part 55f with which the projecting part 62b engages do not intersect each other in the entire stroke range in which the pair of clipper blades 53 and 54 reciprocate. Each position of the recesses 55f and 25f is set. For this reason, in this embodiment, 1st outline B1 and 2nd outline B2 do not overlap. As a result, for example, the level difference caused by the error in the thickness of the first transmission body 61 or the second transmission body 62 corresponding to any of the clipper blades 53 (24) and the clipper blades 53 (24) Even when it occurs in the first contour line B1 or the second contour line B2, it is possible to effectively avoid hindering the reciprocating motion of the pair of clipper blades 53 and 54 due to the catch caused by these steps. .

  Further, in this embodiment, as shown in FIG. 5, the pair of clipper blades 53 and 54 has a pair of blades 55 of the same specification formed in a rectangular plate shape, and one blade Each blade 55 constitutes a pair of clipper blades 53 and 54 by turning over 55 around the center line O2 along the width direction of the blade 55 and overlapping the other blade 55 in the thickness direction. The projecting portions 61b and 62b of the transmission body 61 and the second transmission body 62 are arranged symmetrically with respect to the center line O2 of the blade 55, and the first transmission body 61 and the second transmission body are disposed on the blade 55. Of the body 62, the concave portion 55f (engaging portion) for engaging any one of the protrusions 61b (32b) and the center line O2 of the blade 55 are arranged at positions symmetrical to the concave portion 55f, and more than the concave portion 55f. Wide open And passing the recess 55g is formed. For this reason, in this embodiment, since a pair of clipper blades 53 and 54 can be configured by combining two blades 55 having the same specification, a manufacturing cost of the clipper blades can be reduced. Further, even when the pair of clipper blades 53 and 54 are configured using the blade 55 having the same specification, the first transmission body 61 and the second transmission body 62 are respectively connected to the corresponding clipper blades 53 and 54. By connecting, each clipper blade 53, 54 can be reciprocated in the opposite direction. In addition, when the clipper blades 53 and 54 are maintained and the clipper blades 53 and 54 are replaced, the pair of clipper blades 53 and 54 can be easily obtained by releasing the lock by the C-shaped retaining ring 74 of the coupling mechanism 70. Can be removed from the cutter guide 51, and replacement work and maintenance work can be performed. Further, when the blades 55 having the same specifications are overlapped as described above, the recess 55f and the insertion recess 55g are overlapped. In the present embodiment, the protrusion 61b or the protrusion 62b, and the protrusion 61b, Since the recess 55f corresponding to 62b is formed in a burrow shape and the insertion recess 55g is formed in a burrow shape that is wider than the recess 55f, the curvature of the contour of the recess 55f is the curvature of the contour of the insertion recess 55g. Is different. As a result, the contour line between the recess 55f and the protrusion 61b (32b) engaged with the recess 55f intersects the contour line of the insertion recess 55g at a point, and the pair of clipper blades 53, 54 and the pair of these Steps caused by errors in the thickness of the first transmission body 61 or the second transmission body 62 corresponding to the clipper blades 53 and 54 are generated in the first contour line B1 or the second contour line B2. Even in this case, it is possible to effectively prevent the reciprocating motion of the pair of clipper blades 53 and 54 from being hindered by the catch caused by these steps.

  In another aspect of the present embodiment, the cutting blade unit 50, the cutter guide 51 of the cutting blade unit 50, and the operating rod 2 connected to the cutter guide 51 and the transmission unit 60 of the cutting blade unit are powered. A clipper-type cutting blade device 1 having a drive source 3 for transmission. For this reason, in this embodiment, the pruning operation can be performed by driving the cutter guide 51 in the front-rear direction of the operator with the operation rod 2. Further, when maintaining the pair of clipper blades 53 and 54 or replacing any one of the clipper blades 53 (24), the pair of clipper blades 53 (24) can be easily released by releasing the lock by the C-shaped retaining ring 74 of the coupling mechanism 70. The blades 53 and 54 can be removed from the cutter guide 51, and replacement work and maintenance work can be performed.

  The present invention is not limited to the embodiment described above, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

  For example, as the blade, in addition to the blade shown in FIG. 5, the blade 55 shown in FIG. 11 can be adopted.

  Referring to FIG. 11, the blade 55 is different from the blade 55 of FIG. 5 in that blade portions 55b are provided on both long sides of the base material 55a. In order to avoid interference with the first and second transmission members 61 and 62 on the other long side of the blade 55, some blade portions are omitted.

  When the blade 55 of FIG. 11 is employed, the workability can be further improved because the plants and the like can be pruned by the operation of pulling the operation rod 2.

  Further, the operation member of the connection mechanism 70 is not limited to the C-shaped retaining ring, and for example, a split pin may be adopted. In order to fit the split pin, an insertion hole may be formed in the diameter direction in the headed pin.

  Further, as described above, the transmission unit 60 preferably drives the pair of clipper blades 53 and 54, but if possible, a configuration in which only one of the clipper blades is driven may be employed.

DESCRIPTION OF SYMBOLS 1 Hair clipper type blade 2 Operating rod 3 Drive source 50 Cutting blade unit 51 Cutter guide 52 Lower plate (an example of plate)
53 Upper clipper blade 54 Lower clipper blade 55 Blade 55a Base material 55b Blade portion 55f Recessed portion (an example of an engaging portion)
55 g Insertion recessed part 60 Transmission unit 61 1st transmission body 62 2nd transmission body 70 Connection mechanism (an example of a connection means)
71 Stepped bolt (an example of a connecting member)
73 Headed Pin (Example of connecting member)
74 C-type retaining ring (an example of an operating member)
B1 1st outline B2 2nd outline O2 Center line

Claims (6)

A pair of clipper blades each having a base material formed in a rectangular plate shape and a plurality of blade portions protruding from the long side of the base material, and stacked in the thickness direction of each other;
A cover portion that is formed in a rectangular plate shape that covers the base material and that is disposed on one side in the thickness direction of the pair of clipper blades, and a projection that protrudes from a non-end portion in the longitudinal direction of the cover portion and is attached with an operation rod A cutter guide having a portion;
A plate that is formed in a rectangular plate shape that covers the substrate, and that is disposed on the other end in the thickness direction of the pair of clipper blades;
A plurality of connecting members for connecting the pair of clipper blades and the plate to the cutter guide; and a single operating member capable of releasing the connecting state of the connecting members, and the connection by the connecting member by the single operating member. Connecting means configured to be able to remove the plate and the pair of clipper blades from the cutter guide in the thickness direction by releasing the state;
At least one of the pair of clipper blades is connected to the middle portion in the longitudinal direction of the pair of clipper blades so as to be insertable / removable in the thickness direction so that one of the pair of clipper blades reciprocates relative to the other. A cutting blade unit comprising: a transmission unit that transmits a driving force in a longitudinal direction. The cutting blade unit according to claim 1,
The transmission unit is connected to one of the pair of clipper blades so as to be insertable / removable in the thickness direction, and connected to the other of the pair of clipper blades so as to be insertable / removable in the thickness direction. Including a second transmission body,
The first transmission body and the second transmission body are configured to output power so that the corresponding clipper blades reciprocate in the opposite direction with respect to the counterpart clipper blades. Cutting blade unit. In the cutting blade unit according to claim 2,
The first transmission body and the second transmission body each have a protrusion protruding in the width direction of the pair of clipper blades,
The pair of clipper blades are formed with engaging portions that engage and disengage the protrusions of the corresponding transmission members in the thickness direction. The cutting blade unit according to claim 3,
A first contour line formed by the protrusion of the first transmission body and the engaging portion engaged with the protrusion, and a second contour formed by the protrusion of the second transmission body and the engaging portion engaged with the protrusion. The cutting blade unit, wherein each position of the protrusion and the engagement portion is set so that the contour line avoids crossing each other in an entire stroke range in which the pair of clipper blades reciprocate. In the cutting blade unit according to claim 3 or 4,
The pair of hair clipper blades is composed of a set of two blades of the same specification formed in a rectangular plate shape, and the set of two blades has one blade along the width direction of the blade. By turning over the center line and overlapping with the other blade in the thickness direction, the pair of clipper blades are configured,
The protrusions of the first transmission body and the second transmission body are arranged symmetrically with respect to the center line,
The set of two blades includes a recess that constitutes the engaging portion that engages one of the protrusions of the first transmission body and the second transmission body, and the center line. A cutting blade unit characterized in that an insertion recess is formed at a position symmetrical to the engaging portion and opens wider than the recess. The cutting blade unit according to any one of claims 1 to 5,
An operating rod connected to the cutter guide of the cutting blade unit via the mounting portion;
A clipper-type cutting blade device comprising: a drive source for transmitting power to the transmission unit of the cutting blade unit.

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