Offset working machine

Abstract

To efficiently improve balance in a left-right direction of an offset working machine in working and non-working.SOLUTION: An offset working machine includes: a mounting part capable of being connected to a travel machine body; a work part for receiving power from the travel machine body and performing predetermined work; a power transmission part for transmitting the power from the mounting part to the work part; an offset mechanism part arranged between the mounting part and the work part, and moving the work part in a left-right direction; and a movable counterweight part mounted on the mounting part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an offset working machine.

Background Art

[0002] Conventionally, a lawn mower is known as a working machine for performing a lawn mowing operation to remove weeds on farm roads and wastelands. Generally, the lawn mower is mounted on the rear part of a traveling machine body such as a tractor, and the lawn mowing operation is advanced by operating the working part while moving together with the traveling machine body. In recent years, an offset type lawn mower is known in which the working part for performing the lawn mowing operation moves offset to the side of the traveling machine body and the lawn mowing operation is performed on the side of the traveling machine body. For example, the lawn mowers described in Patent Documents 1 to 3 are provided with an offset mechanism portion constituted by a parallel link mechanism between a mounting portion mounted on a traveling machine body and a working portion for performing lawn mowing, and the offset mechanism portion enables the offset movement of the working portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] Due to the characteristic that the offset working machine performs work with the working part protruding greatly to the side of the traveling machine body, the position of the center of gravity of the offset working machine is different during work and during non-work. Therefore, in order to realize stable work of the offset working machine, it is important to maintain the balance in the left-right direction during work and during non-work.

[0005] One of the problems of the present invention is to efficiently improve the balance in the left - right direction of the offset working machine during operation and non - operation.

Means for Solving the Problem

[0006] The offset working machine in one embodiment of the present invention includes a mounting portion connectable to a traveling body, a working portion that receives power from the traveling body and performs a predetermined operation, a power transmission portion that transmits the power from the mounting portion to the working portion, an offset mechanism portion disposed between the mounting portion and the working portion and that moves the working portion in the left - right direction, and a movable counterweight portion attached to the mounting portion.

[0007] The counterweight portion may include a movable support portion and a weight portion supported by the support portion.

[0008] The support portion may be a foldable support portion. Also, the support portion may be a slide - type support portion. At this time, the support portion may have an actuator that operates the support portion.

[0009] The support portion may be a link - type support portion. At this time, the link - type support portion may be interlocked with the operation of the offset mechanism portion.

Effect of the Invention

[0010] The offset working machine in one embodiment of the present invention can efficiently improve the balance in the left - right direction during operation and non - operation.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0012] Hereinafter, an offset working machine which is an embodiment of the present invention will be described with reference to the drawings. However, the offset working machine of an embodiment of the present invention can be implemented in many different modes and is not to be construed as being limited to the description of the examples shown below. In the drawings referred to in the present embodiment, the same parts or parts having the same functions are denoted by the same reference numerals, and the repeated description thereof is omitted.

[0013] In the following description, for the sake of convenience of explanation, terms indicating directions such as "up", "down", "front", "rear", "right", and "left" are used. However, for the offset working machine of an embodiment of the present invention, the direction in which gravity acts is "down", and the opposite is "up". Also, the direction in which the traveling body advances is "front", and the opposite is "rear". Further, toward the "front", the right side is "right" and the left side is "left". Also, with reference to the center line along the traveling direction of the offset working machine, the direction away from the center line is the outer side, and the approaching direction is the inner side.

[0014] 〈First Embodiment〉 [Configuration of Offset Working Machine] FIG. 1 is a plan view showing the configuration of the offset working machine 100 of the first embodiment. In the present embodiment, as an example of the offset working machine 100, an offset type lawn mower is illustrated. However, the offset working machine 100 is not limited to a lawn mower, and may be other offset type working machines such as a ridging machine or a plow.

[0015] As shown in FIG. 1, the offset working machine 100 of the present embodiment includes a mounting portion 10, an offset mechanism portion 20, a power transmission portion 30, a working portion 40, and a counterweight portion 50. Specifically, the offset working machine 100 is connected to a traveling machine body (not shown) such as a tractor by the mounting portion 10. The mounting portion 10 and the working portion 40 are connected via the offset mechanism portion 20 and the power transmission portion 30. With such a configuration, the offset working machine 100 moves forward as the traveling machine body travels. While the offset working machine 100 is moving, the working portion 40 operates by the power received from the traveling machine body and performs a lawn mowing operation.

[0016] The mounting portion 10 is a portion connected to a three-point link mechanism (not shown) provided on the traveling machine body. Specifically, the mounting portion 10 of the present embodiment includes a front frame 11, a top link coupling portion (top mast) 12 (see FIG. 3), a lower link coupling portion (lower link pin) 13, an input shaft 14, a power transmission means 15, and an output shaft 16. Note that the top link coupling portion 12 and the lower link coupling portion 13 may be connected to the three-point link mechanism of the traveling machine body via an auto hitch arm (not shown). In the present embodiment, the output shaft 16 is provided at a position offset from the input shaft 14 in the left-right direction, but is not limited to this example. For example, the mounting portion 10 may have a structure in which the output shaft 16 is disposed at a position directly behind the input shaft 14. Although not shown, a control portion is provided on the front frame 11 of the mounting portion 10. The control portion includes an arithmetic processing device, a storage device, a communication device, etc., and has a function of controlling the overall operation of the offset working machine 100.

[0017] The offset mechanism unit 20 is disposed between the mounting unit 10 and the working unit 40, and is a mechanism that moves the working unit 40 in the left - right direction by rotating with respect to the mounting unit 10. In the present embodiment, the offset mechanism unit 20 includes a parallel link mechanism that is rotatably connected to the mounting unit 10 and the working unit 40. That is, when the offset mechanism unit 20 rotates with respect to the mounting unit 10, the working unit 40 can be moved in the left - right direction while maintaining the orientation of the working unit 40 with respect to the traveling direction. That is, the offset mechanism unit 20 can offset - move the working unit 40 laterally with respect to the traveling direction of the traveling body. However, the specific configuration of the offset mechanism unit 20 is not limited to this example, and any mechanism that can offset - move the working unit 40 laterally with respect to the traveling direction of the traveling body may be used.

[0018] FIG. 2 is a plan view showing a configuration in which the illustration of the power transmission unit 30 is omitted in the offset working machine 100 of the first embodiment. As shown in FIG. 2, the offset mechanism unit 20 of the present embodiment has a first link arm 21, a second link arm 22, a third link arm 23, and an actuator 24.

[0019] The first link arm 21 is disposed below the power transmission unit 30 shown in FIG. 1. That is, the power transmission unit 30 is disposed so as to overlap a part of the offset mechanism unit 20. One end of the first link arm 21 is rotatably connected to the front frame 11 of the mounting unit 10 via a rotation shaft 410, and the other end of the first link arm 21 is rotatably connected to the third link arm 23 and the working unit 40 via a rotation shaft 420.

[0020] The second link arm 22 is disposed substantially parallel to the first link arm 21 at a position separated from the first link arm 21 and has a length approximately the same as that of the first link arm 21. One end of the second link arm 22 is rotatably connected to the front frame 11 of the mounting unit 10 via a rotation shaft 430, and the other end of the second link arm 22 is rotatably connected to the third link arm 23 via a rotation shaft 440.

[0021] The third link arm 23 is arranged substantially parallel to the front frame 11 and connects the first link arm 21 and the second link arm 22 to each other. One end of the third link arm 23 connected to the first link arm 21 is fixed to the working part 40, and is configured so that the positional relationship between the third link arm 23 and the working part 40 does not change.

[0022] With the above configuration, the front frame 11, the first link arm 21, the second link arm 22, and the third link arm 23 constitute a parallelogram link mechanism with each side. With this parallelogram link mechanism, the offset mechanism part 20 can offset and move the working part 40 in the left - right direction while maintaining the orientation of the working part 40 so that the longitudinal direction of the working part 40 is substantially parallel to the left - right direction.

[0023] The actuator 24 is a power source for operating the offset mechanism part 20 and is composed of a telescopic member capable of telescopic movement such as an electric cylinder, a gas cylinder, or a hydraulic cylinder. One end of the actuator 24 is rotatably connected to the front frame 11, and the other end of the actuator 24 is rotatably connected to the vicinity of the center (or slightly rearward of the center) of the first link arm 21. By the telescopic movement of the actuator 24, the first link arm 21 rotates with the rotation axis 410 as the rotation fulcrum, and the offset mechanism part 20 operates. The offset amount of the working part 40 is controlled by the telescopic amount of the actuator 24.

[0024] Returning to the description with reference to FIG. 1. The power transmission part 30 is a mechanism for transmitting the power transmitted through the input shaft 14, the power transmission means 15, and the output shaft 16 of the mounting part 10 to the working part 40. As described above, the power transmission part 30 is a part of the offset mechanism part 20 and is specifically arranged to overlap with the first link arm 21.

[0025] The offset working machine 100 of this embodiment uses a chain drive mechanism as the power transmission unit 30. Specifically, the power transmission unit 30 includes at least a drive sprocket 31, a driven sprocket 32, and a roller chain 33. The roller chain 33 is wound between a pair of sprockets (the drive sprocket 31 and the driven sprocket 32).

[0026] The drive sprocket 31 is a gear that engages with the rotating output shaft 16 and rotates, transmitting the rotational power received from the output shaft 16. The driven sprocket 32 is a gear that is passively rotated by the power transmitted from the drive sprocket 31 via the roller chain 33. The roller chain 33 is a member that transmits power and the like as tension. Note that the power transmission unit 30 is not limited to a chain drive mechanism and may be configured by a belt drive mechanism using a pair of pulleys and a belt.

[0027] The front of the power transmission unit 30 is rotatably connected to the mounting portion 10, and the rear is rotatably connected to the working portion 40. In this embodiment, the rotation center of the power transmission unit 30 with respect to the mounting portion 10 coincides with the rotation center of the drive sprocket 31. That is, the rotation center of the power transmission unit 30 with respect to the mounting portion 10 coincides with the rotation center of the output shaft 16. Also, the rotation center of the power transmission unit 30 with respect to the working portion 40 coincides with the rotation center of the driven sprocket 32.

[0028] Furthermore, the rotation center of the power transmission unit 30 with respect to the mounting portion 10 coincides with the rotation center (the center of the rotation shaft 410) of the offset mechanism portion 20 (specifically, the first link arm 21) with respect to the mounting portion 10. Thus, in this embodiment, since the first link arm 21, which is a part of the offset mechanism portion 20, and the power transmission unit 30 rotate integrally with respect to the mounting portion 10, there is an advantage that a large offset amount can be ensured without being restricted by the bending angle as in the case of using a universal joint for power transmission.

[0029] The working unit 40 is a part for performing mowing work, and includes a working rotor 41 and a blade drive unit 42. The working unit 40 performs mowing work by driving the working rotor 41 upon receiving the power transmitted by the power transmission unit 30 to the blade drive unit 42. The working rotor 41 includes a claw shaft 41a and a plurality of cutting blades 41b radially provided on the claw shaft 41a. The claw shaft 41a extends in the left-right direction so as to be substantially orthogonal to the traveling direction of the traveling body. The working rotor 41 performs mowing by rotating a plurality of cutting blades 41b together with the claw shaft 41a. The blade drive unit 42 uses the power transmitted by the power transmission unit 30 as the rotational power of the claw shaft 41a of the working rotor 41. The blade drive unit 42 may be a chain drive mechanism having the same configuration as the power transmission unit 30, or may be a belt drive mechanism.

[0030] The counterweight unit 50 is attached to the front frame 11 of the mounting unit 10 and functions as a counterweight for balancing the weight of the offset working machine 100. In the offset working machine 100 of the present embodiment, since the working unit 40 moves offset to the right in the traveling direction, considering the weight balance with respect to the working unit 40, the counterweight unit 50 is disposed on the left side of the front frame 11 in the traveling direction. By adopting such an arrangement, when the working unit 40 moves offset to the right, the weight unit 52 of the counterweight unit 50 can maintain the balance in the left-right direction. ーweight unit 50 can maintain the balance in the left-right direction by the weight unit 52 of the counterweight unit 50.

[0031] The counterweight unit 50 includes a movable support unit 51 and a weight unit 52 supported by the support unit 51. The support unit 51 is fixed to the front frame 11 and has a movable mechanism for changing the position of the weight unit 52 in the left-right direction. Specifically, the counterweight unit 50 of the present embodiment has a structure in which the support unit 51 can be bent downward, so that the position of the weight unit 52 can be moved outward or inward. That is, the offset working machine 100 of the present embodiment includes a foldable counterweight unit 50.

[0032] [Configuration of the counterweight section] FIG. 3 is an enlarged rear view of the counterweight section 50 in the offset working machine 100 of the first embodiment. Specifically, FIG. 3(A) shows a state in which the weight section 52 is moved to the outermost position (hereinafter referred to as the deployed state), and FIG. 3(B) shows a state in which the weight section 52 is moved to the innermost position (hereinafter referred to as the stored state). As shown in FIGS. 3(A) and 3(B), the support section 51 includes a connecting arm 51a, a support arm 51b, a weight holding member 51c, and an actuator 51d.

[0033] The connecting arm 51a is fixed to the mounting section 10 (front frame 11) and serves to connect the mounting section 10 and the counterweight section 50. The support arm 51b is formed of a rod-shaped member. One end thereof is rotatably connected to the connecting arm 51a via a rotation shaft 510, and the other end is connected to the weight holding member 51c. As shown in FIG. 1, the connecting arm 51a has a structure in which two plate-shaped members are arranged facing each other, and the support arm 51b is connected via a rotation shaft 510 provided between these plate-shaped members.

[0034] The weight holding member 51c is a member for holding each weight (weight) constituting the weight section 52, and has a locking portion (not shown) for locking each weight. Specifically, in the present embodiment, a portion that functions as a hook is provided on each weight, and each weight is held by hooking the hook on the locking portion of the weight holding member 51c. However, the present invention is not limited to this example, and the holding method of the weight section 52 is arbitrary. That is, the weight holding member 51c only needs to be able to fix (or lock) the weight section 52 so that it does not fall off during the operation of the offset working machine 100. In the present embodiment, the weight holding member 51c is fixed to the support arm 51b. However, it is also possible to configure the weight holding member 51c to be position-adjustable in the left-right direction with respect to the support arm 51b. In this case, for example, a plurality of fixing holes for bolt-fixing the weight holding member 51c are provided in the support arm 51b so that the position of the bolt-fixing can be adjusted.

[0035] Also, in this embodiment, an example in which the weight portion 52 is composed of a plurality of weights is shown. However, the present invention is not limited to this example, and the weight portion 52 may be composed of a single weight. When the weight portion 52 is composed of a plurality of weights, it is possible to increase or decrease the number of weights as appropriate according to the offset amount of the working portion 40 and adjust the balance in the left-right direction.

[0036] The actuator 51d is a power source for bending the counterweight portion 50, and is composed of a telescopic member capable of telescopic operation such as an electric cylinder, a gas cylinder, or a hydraulic cylinder. One end (cylinder side) of the actuator 51d is rotatably connected to the connecting arm 51a via the rotation shaft 520, and the other end (rod side) is connected to a position slightly rearward (for example, below the weight portion 52) from the center of the support arm 51b. The actuator 51 d is controlled in its operation by a control unit (not shown), and the actuator is based on a control signal transmitted from the control unit. 51d The amount of expansion and contraction of, that is, The amount of rotation of the support arm 51b with respect to the connecting arm 51b is controlled.

[0037] By the telescopic operation of the actuator 51d, the support arm 51b rotates in the vertical direction around the rotation shaft 510 with respect to the connecting arm 51a, and the position of the weight portion 52 changes. Specifically, when the actuator 51d extends, the support arm 51b rotates upward (clockwise here) and enters the deployed state (FIG. 3(A)). In the deployed state, the weight portion 52 is located at the outermost side. Also, when the actuator 51d contracts, the support arm 51b rotates downward (counterclockwise here) and enters the stored state (FIG. 3(B)). In the stored state, the weight portion 52 is located at the innermost side.

[0038] In this embodiment, when the offset amount of the offset mechanism unit 20 reaches its maximum during operation, that is, when the working unit 40 is located at the outermost position (right side toward the advancing direction), the counterweight unit 50 is set to the deployed state shown in Fig. 3(A). Specifically, when the offset amount of the offset mechanism unit 20 reaches its maximum (or exceeds a predetermined offset amount), the above-described control unit controls the actuator 51d to extend, setting the counterweight unit 50 to the deployed state. Thereby, the center of gravity shifted outward in the right direction by the offset-moved working unit 40 can be returned to the left direction by the weight unit 52 of the counterweight unit 50, and the balance in the left-right direction can be adjusted.

[0039] Conversely, when the offset amount of the offset mechanism unit 20 reaches its minimum during non-operation, that is, when the working unit 40 is located at the innermost position (left side toward the advancing direction) (strictly speaking, the position directly behind the mounting unit 10), the counterweight unit 50 is set to the stored state shown in Fig. 3(B). Specifically, when the offset amount of the offset mechanism unit 20 reaches its minimum (or falls below a predetermined offset amount), the above-described control unit controls the actuator 51d to contract, setting the counterweight unit 50 to the stored state. Thereby, when the working unit 40 is close to the center line of the offset working machine 100 (that is, when there is almost no shift in the center of gravity due to offset movement), the weight unit 52 of the counterweight unit 50 can be brought closer to the center line, preventing the center of gravity from shifting outward in the left direction due to the weight unit 52. The offset amount of the offset mechanism unit 20 is grasped by appropriately providing a sensor or the like that detects the angle of the link arm 21 or the link arm 22 with respect to the front frame 11. For example, it is possible to provide a potentiometer at one end of the second link arm 22 connected to the rotation shaft 430 and detect and calculate the angle of the second link arm 22 with respect to the front frame 11. It is also possible to grasp the offset amount of the offset mechanism unit 20 by providing a sensor or the like that detects the rotation amount of the rotation shaft 420.

[0040] As described above, the offset working machine 100 of the present embodiment includes a movable counterweight unit 50, and can change the position of the weight unit 52 in the left - right direction according to the offset amount of the working unit 40. Therefore, the left - right balance during work and non - work can be efficiently improved.

[0041] (Modification example of the first embodiment) In the above - described first embodiment, an example was shown in which the counterweight unit 50 is set to either the deployed state (Fig. 3(A)) or the stored state (Fig. 3(B)) by the telescopic operation of the actuator 51d. However, it is not limited to this example. For example, the offset working machine 100 of the first embodiment can also set the counterweight unit 50 to an intermediate state between the deployed state and the stored state by adjusting the driving amount (telescopic amount) of the actuator 51d.

[0042] In this modification example, the control unit controls the actuator 51d so as to adjust the driving amount of the actuator 51d according to the offset amount of the offset mechanism unit 20. That is, when the offset amount of the offset mechanism unit 20 of the offset working machine 100 of this modification example changes, the driving amount of the actuator 51d changes according to the offset amount, and the position of the weight unit 52 is controlled so that the weight balance of the offset working machine 100 becomes optimal. The correspondence relationship between the offset amount of the offset mechanism unit 20 and the driving amount of the actuator 51d may be stored in advance in the storage device of the control unit as a table or a relational expression. The driving amount of the actuator 51d is controlled based on the angle of the support arm 51b with respect to the connecting arm 51a detected by an angle sensor such as a potentiometer.

[0043] 〈Second embodiment〉 In this embodiment, an example in which the movable method of the counterweight portion is different from that of the first embodiment will be described. Specifically, the offset working machine of this embodiment includes a slide-type counterweight portion. In this embodiment, the description will be made focusing on the differences from the first embodiment, and for the same parts as those in the first embodiment, the same reference numerals will be used in the drawings and redundant descriptions will be omitted.

[0044] FIG. 4 is a plan view showing the configuration of the offset working machine 200 according to the second embodiment. FIG. 5 is an enlarged rear view of the counterweight portion 55 in the offset working machine 200 according to the second embodiment. Specifically, FIG. 5(A) shows a state (deployed state) in which the weight portion 57 is moved to the outermost side, and FIG. 5(B) shows a state (stored state) in which the weight portion 57 is moved to the innermost side.

[0045] As shown in FIGS. 4 and 5, the counterweight portion 55 includes a movable support portion 56 and a weight portion 57 supported by the support portion 56. The counterweight portion 55 of this embodiment has a structure in which the support portion 56 can expand and contract in the left-right direction, so that the position of the weight portion 57 can be slid outward or (toward the center of the offset working machine 200) inward with respect to the center of the offset working machine 200. That is, the offset working machine 200 of this embodiment includes a slide-type counterweight portion 55.

[0046] The support part 56 has a first support arm 56a, a second support arm 56b, a weight holding member 56c, and an actuator 56d. The first support arm 56a is a hollow cylindrical member having an opening with a first diameter. One end thereof is fixed to the mounting part 10, and the other end is connected to the second support arm 56b. The second support arm 56b is a hollow cylindrical member having an opening with a second diameter smaller than the first diameter. One end thereof is connected to the first support arm 56a, and the other end is connected to the weight holding member 56c. The second support arm 56b is inserted into the first support arm 56a and is movable inside the first support arm 56a. That is, the support part 56 has a telescopic structure composed of the first support arm 56a and the second support arm 56b.

[0047] Similar to the first embodiment, the weight holding member 56c is a member for holding each weight (weight) constituting the weight part 57.

[0048] The actuator 56d is a power source for sliding the counterweight part 55 and is composed of a telescopic member capable of telescopic operation such as an electric cylinder, a gas cylinder, or a hydraulic cylinder. One end of the actuator 56d is connected to the first support arm 56a, and the other end is connected near the center of the second support arm 56b. By the telescopic operation of the actuator 56d, the second support arm 56b of the telescopic structure moves inside the first support arm 56a, and the (apparent) lengths of the first support arm 56a and the second support arm 56b, that is, the position of the weight part 57 in the left - right direction with respect to the center position of the offset working machine 100 changes. Specifically, when the actuator 56d extends, the second support arm 56b protrudes from the first support arm 56a and extends outward to be in a deployed state (Fig. 5(A)). Also when the actuator 56d contracts, the second support arm 56b is inserted into the first support arm 56a and is in a stored state (Fig. 5(B)).

[0049] Also in the present embodiment, as in the first embodiment, when the offset amount of the offset mechanism unit 20 becomes maximum during work, the counterweight unit 55 is set to the deployed state shown in FIG. 5(A), and when the offset amount of the offset mechanism unit 20 becomes minimum during non-work, the counterweight unit 55 is set to the stored state shown in FIG. 5(B). Thus, since the offset working machine 200 of the present embodiment can change the position of the weight unit 57 in the left-right direction according to the offset amount of the working unit 40, the left-right balance during work and non-work can be efficiently improved.

[0050] (Modification of the Second Embodiment) In the above-described second embodiment, an example in which the counterweight unit 55 is set to either the deployed state (FIG. 5(A)) or the stored state (FIG. 5(B)) by the expansion and contraction operation of the actuator 56d is shown, but the present invention is not limited to this example. That is, as in the modification of the first embodiment, also in the present modification, by adjusting the driving amount (expansion and contraction amount) of the actuator 56d, the counterweight unit 55 can be set to an intermediate state between the deployed state and the stored state. That is, the driving amount of the actuator 56d may be adjusted according to the offset amount of the offset mechanism unit 20, and the position of the weight unit 57 may be controlled so that the weight balance of the offset working machine 200 becomes optimal.

[0051] <Third Embodiment> In the present embodiment, an example in which the movable method of the counterweight unit is different from that of the first and second embodiments will be described. Specifically, the offset working machine of the present embodiment includes a link-type counterweight unit. In the present embodiment, the description will be made focusing on the difference from the first embodiment, and the same parts as those in the first embodiment will be denoted by the same reference numerals in the drawings, and the overlapping description will be omitted.

[0052] FIG. 6 is a plan view showing the configuration of the offset working machine 300 according to the third embodiment. Specifically, FIG. 6(A) shows the state where the weight portion 62 is moved to the outermost position (deployed state), FIG. 6(B) shows the state where the weight portion 62 is moved between the deployed state and the stored state (intermediate state), and FIG. 6(C) shows the state where the weight portion 62 is moved to the innermost position (stored state).

[0053] As shown in FIG. 6, the counterweight portion 60 includes a movable support portion 61 and a weight portion 62 supported by the support portion 61. In the counterweight portion 60 of the present embodiment, the support portion 61 functions as a link mechanism that interlocks with the operation of the offset mechanism portion 20, so that the position of the weight portion 62 in the left-right direction can be moved outward or inward. That is, the offset working machine 300 of the present embodiment includes a link-type counterweight portion 60.

[0054] The support portion 61 has a connecting arm 61a, a support arm 61b, a weight holding member 61c, and a link arm 61d. The connecting arm 61a is fixed to the mounting portion 10 and serves to connect the mounting portion 10 and the counterweight portion 60. The support arm 61b is composed of a rod-shaped member. One end is rotatably connected to the connecting arm 61a via a rotation shaft 610, and the other end is connected to the weight holding member 61c. Similar to the first embodiment, the connecting arm 61a has a structure in which two plate-shaped members are arranged facing each other, and the support arm 61b is connected via a rotation shaft 610 provided between these plate-shaped members.

[0055] Similar to the first embodiment, the weight holding member 61c is a member for holding each weight (weight) constituting the weight portion 62.

[0056] The link arm 61d is a rod-shaped member having a bent portion 61da. One end of the link arm 61d is rotatably connected to the support arm 61b via a rotation shaft 620, and the other end is rotatably connected to the second link arm 22 of the offset mechanism portion 20 via a rotation shaft 630. As shown in FIG. 6(C), the bent portion 61da is provided in the vicinity of the rotation shaft 620 provided at the end of the support arm 61b. Further, the rotation shaft 610, which is the connecting portion between the connecting arm 61a and the support arm 61b, is located closer to the weight holding member 61c than the rotation shaft 620, which is the connecting portion between the link arm 61d and the support arm 61b. At this time, the distance between the rotation shaft 610 and the rotation shaft 620 is longer than the distance between the bent portion 61da and the rotation shaft 620.

[0057] By having the above-described link structure, the counterweight portion 60 of the present embodiment changes the position of the weight portion 62 in the left-right direction in conjunction with the operation of the offset mechanism portion 20. In other words, the counterweight portion 60 of the present embodiment changes the position of the weight portion 62 in the left-right direction in conjunction with the offset amount of the working portion 40.

[0058] Specifically, in a plan view, when the offset amount of the working portion 40 is maximum, the support arm 61b is in an extended state (FIG. 6(A)). Then, as shown in FIG. 6(B), when the working portion 40 moves inward and the offset amount decreases, the link arm 61d is pushed upward obliquely to the left in conjunction with the operation of the offset mechanism portion 20, and the support arm 61b rotates backward (here, counterclockwise). At this time, the rotation angle of the support arm 61b also changes according to the change in the offset amount, and finally, when the offset amount of the working portion 40 is minimum, the storage state shown in FIG. 6(C) is obtained through the intermediate state shown in FIG. 6(B).

[0059] Also in the present embodiment, as in the first embodiment, when the offset amount of the offset mechanism unit 20 becomes maximum during work, the counterweight unit 60 is set to the deployed state, and when the offset amount of the offset mechanism unit 20 becomes minimum during non-work, the counterweight unit 60 is set to the stored state. Thus, since the offset working machine 300 of the present embodiment can change the position of the weight unit 62 in the left-right direction according to the offset amount of the working unit 40, it is possible to efficiently improve the balance in the left-right direction during work and non-work.

[0060] As described above, the present invention has been described with reference to the drawings. However, the present invention is not limited to the above-described embodiments (including modified examples), and can be appropriately changed without departing from the gist of the present invention. For example, based on each embodiment, those in which those skilled in the art appropriately add, delete, or change the design of components are also included in the scope of the present invention as long as they have the gist of the present invention. Furthermore, the above-described embodiments can be appropriately combined as long as there is no contradiction, and technical matters common to each embodiment are included in each embodiment even if not explicitly described.

[0061] Even if there are other operational effects different from those brought about by the aspects of the above-described embodiments, those that are obvious from the description of this specification or can be easily predicted by those skilled in the art are naturally understood to be brought about by the present invention.

Explanation of Reference Numerals

[0062] 10... mounting portion, 11... front frame, 12... top link coupling portion, 13... lower link coupling portion, 14... input shaft, 15... power transmission means, 16... output shaft, 20... offset mechanism unit, 21... first link arm, 22... second link arm, 23... third link arm, 24... Actuator, 30... Power transmission unit, 31... Driving sprocket, 32... Driven sprocket, 33... Roller chain, 40... Working unit, 41... Working rotor, 41a... Claw shaft, 41b... Cutting blade, 42... Cutting blade drive unit, 50, 55, 60... Counterweight unit, 51, 56, 61... Support unit, 52, 57, 62... Weight unit, 51a, 61a... Connecting arm, 51b, 61b... Support arm, 61da... Bending part, 56a... First support arm, 56b... Second support arm, 51c, 56c, 61c... Weight holding member, 51d, 56d... Actuator, 61d... Link arm, 100, 200, 300... Offset working machine, 410, 420, 430, 440, 510, 520, 610, 620, 630... Rotation shaft

Claims

1. A mounting part that can be connected to a traveling body, A working part that receives power from the traveling body and performs a predetermined operation, A power transmission part that transmits the power from the mounting part to the working part, An offset mechanism part that is disposed between the mounting part and the working part and offsets the working part laterally with respect to the traveling direction of the traveling body by rotating about an axis in the vertical direction with respect to the mounting part, A movable counterweight part attached to the mounting part, Comprising, The counterweight part includes a weight part, The weight part is movable in a direction opposite to the offset movement direction of the working part, an offset working machine.

2. The offset working machine according to claim 1, wherein the counterweight part moves the weight part according to the offset amount of the working part.

3. The counterweight part includes driving means, The offset working machine according to claim 1 or 2, wherein the driving means moves the weight part according to the offset movement of the working part.

4. The offset working machine according to claim 3, wherein the driving means is an actuator.

5. The offset working machine according to claim 1, wherein the counterweight part includes a foldable support part that supports the weight part.

6. The offset working machine according to claim 1, wherein the counterweight part includes a slide-type support part that supports the weight part.

7. A mounting part that can be connected to a traveling body, A working part that receives power from the traveling body and performs a predetermined operation, A power transmission part that transmits the power from the mounting part to the working part, An offset mechanism part that is disposed between the mounting part and the working part and offsets the working part in the left-right direction by rotating about an axis in the vertical direction with respect to the mounting part, A movable counterweight part attached to the mounting part, Comprising, The counterweight part includes a movable support part and a weight part supported by the support part, The support part is a link-type support part that interlocks with the operation of the offset mechanism part, an offset working machine.

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