Walk-behind tiller

Abstract

To prevent a walk-behind tiller from entering dangerous situations caused by a tiller body moving in a way that an operator does not anticipate in the walk-behind tiller operated by the operator walking behind the tiller machine while performing tillage work.SOLUTION: A walk-behind tiller including tillage tines 8 at a bottom of a tiller body and operated by gripping a steering handle 3 provided toward the rear of the tiller body. The walk-behind tiller includes a travel sensor 10 for detecting rotation of a tail wheel 11 rotating in contact with the ground as the tiller travels, calculates a travel speed from the number of rotations detected by the travel sensor 10, and when a speed change exceeding the normal working speed or a backward movement is detected during the forward movement work, performs travel stop control or engine stop control.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a walk-behind cultivator in which an operator performs tilling work by walking along the tiller while operating a travel handle provided at the rear of the machine body. [Background technology]

[0002] As described in Patent Publication No. 5880680, in a walk-behind cultivator, the operator holds an operating handle that is attached to the rear of the machine body on which the tilling tines are attached, and rotates the tilling tines while walking along the rear of the machine body to perform tasks such as tilling and furrowing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5880680 Summary of the Invention [Problem to be solved by the invention]

[0004] Walk-behind tillers are operated by an operator who walks at the rear of the machine, adjusting the tilling depth and travel speed. However, if the cultivated land is hard in parts or contains rocks, the rapidly rotating tiller tines can cause the machine to suddenly move forward (dashing) or backward (kickback), so the operator must operate the machine with great care.

[0005] To prevent a dangerous situation caused by a machine body moving in a way that is not predicted by an operator, in a walk-behind cultivator in which an operator performs tilling work while walking behind the machine body. [Means for solving the problem]

[0006] The above-mentioned object of the present invention is achieved by the following technical means.

[0007] The invention of claim 1 is a walk-behind tiller that has tilling tines 8 on the bottom of the body and is operated by gripping a steering handle 3 that is provided toward the rear of the body, and is characterized in that it is provided with a travel sensor 10 that detects the rotation of a tail wheel 11 that rotates in contact with the ground as the body moves, and calculates the travel speed from the number of rotations detected by the travel sensor 10, and when it detects a speed change that exceeds the normal working speed during forward work or when it detects reverse movement, it performs travel stop control or engine stop control.

[0008] The invention of claim 2 is a walk-behind tiller as described in claim 1, characterized in that the engine 15 can be started by either disengaging the traveling clutch 27, placing the throttle lever 5 in the lowest speed position, or placing the speed change lever 14 in neutral.

[0009] The invention of claim 3 is a walk-behind tiller as described in claim 1 or claim 2, in which a battery 17 and an alternator 16 are arranged forward of the running wheels 1 located at the bottom of the machine body, a tilling shaft 7 supporting the tilling tines 8 is provided at the rear of the machine body, and a balance weight 20 that moves in the fore-and-aft direction of the machine body is provided.

[0010] The invention of claim 4 is a walk-behind tiller as described in claim 3, in which a balance weight 20 is provided which engages with a drive tool 29 of a slide rail 28 provided in the fore-and-aft direction of the machine body by a pair of front and rear slide pins 26, an electric motor 21 is provided which engages with the drive tool 29 and slides back and forth, and a motor control switch 6 which controls the drive of the electric motor 21 is provided on the steering handle 3.

[0011] The invention of claim 5 is a walk-behind tiller as described in claim 4, characterized in that front and rear sensors 23, 24 are provided to detect the forward and rearward movement of the balance weight 20, and the tilling clutch 13 is disengaged when the front sensor 23 detects the balance weight, and the tilling clutch 13 is engaged when the rear sensor 24 detects the balance weight. [Effects of the Invention]

[0012] In the invention of claim 1, the worker performing tilling work using the walk-behind tiller walks along holding the control handle 3 that extends to the rear of the machine, and the running speed of the machine is detected by a running sensor 10 that measures the rotation of the tail wheel 11.The running speed calculated from the number of rotations is monitored, and if it is determined that the running speed is a sudden forward dash, a sudden stop, or a kickback, running stop control or engine stop control is performed to stop the machine from moving, thereby avoiding the risk of the worker being dragged or caught in the rotating tiller tines.

[0013] With the invention of claim 2, even if you try to restart the engine 15 to resume work after it has stopped, it will not start unless the traveling clutch is disengaged, the throttle lever 5 is in the lowest speed position, or the speed change lever 14 is in neutral, so the risk of the machine suddenly starting to travel or the tiller tines 8 starting to rotate can be avoided.

[0014] In the invention of claim 3, in addition to the effects of claim 1 or claim 2, the fore-and-aft balance of the machine body centered on the running wheel 1 is stabilized by the front battery 17 and alternator 16 and the rear tiller tines 8, and the load applied to the steering handle 3 can be adjusted by moving the balance weight 20 forward or backward.

[0015] In the invention of claim 4, in addition to the effects of claim 1 or claim 2, by operating the motor control switch 6 provided on the steering handle 3 to move the balance weight 20 back and forth, the load applied to the operator via the steering handle 3 can be reduced and tilling work can be performed.

[0016] In the invention of claim 5, in addition to the effects of claim 1 or claim 2, when the balance weight 20 is moved forward, the front sensor 23 detects the balance weight 20, disengages the tilling clutch 13, ending the tilling work, and the tilling tines 8 can be lifted and rotated easily, and when the rear sensor 24 detects the balance weight 20, the tilling clutch 13 can be turned on and tilling work can be started immediately, thereby simplifying the tilling work. [Brief explanation of the drawings]

[0017] [Figure 1]1 is a right side view of a walk-behind cultivator according to an embodiment of the present invention. FIG. [Figure 2] FIG. 10 is a diagram showing a mechanism for moving a balance weight. [Figure 3] FIG. [Figure 4] FIG. 10 is a flowchart of a travel speed control. [Figure 5] FIG. 10 is a flowchart of tilling drive control according to the position of the balance weight. [Figure 6] FIG. 4 is an enlarged side view of the lower rotary case. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the description of the embodiment, the left and right directions facing the forward direction of the aircraft are referred to as left and right, respectively, and the forward direction is referred to as front and the backward direction is referred to as rear, but this does not limit the configuration of the present invention.

[0019] Figure 1 shows a right side view of a walk-behind tiller, with a battery 17 and alternator 16 mounted at the front of the machine, with the transmission case 2 being the main body, supporting an axle 11' that mounts running wheels 1 and transmitting driving force from an engine 15 at a variable speed. A rotary shaft 7 is supported at the lower end of a rotary case 2K that extends rearward and downward from the transmission case 2, and tilling tines 8 are attached to it, with the upper part covered by a rotary cover 30. A resistance rod 9 is mounted at the rear of this rotary cover 30 so that it can be adjusted up and down, and a tail wheel 11 that rotates and is grounded at the rear is mounted, and a rotation sensor 10 is provided to detect the rotation of this tail wheel 11. An engine stop switch 18 is provided on the engine 15, and a rotary clutch 13 that is operated by an on / off solenoid 12 is installed inside the rotary case 2K.

[0020] A control handle 3 is provided rearward and upward from the transmission case 2, and a position adjustment dial 6 for adjusting the front-rear positions of the main clutch lever 4, throttle lever 5, and balance weight 20 is provided at the upper end of the control handle 3, and a gear change lever 14 is provided extending from the transmission case 2 above the control handle 3.

[0021] 2, a slide rail 28 is provided on the side of the transmission case 2 in the front-rear direction, a drive rail 29 is provided that is movable forward and backward, and the drive rail 29 is moved forward and backward by a drive gear 21G of an electric motor 21 attached to the slide rail 28, and the slide pin 26 of the balance weight 20 that moves along a guide 27' engages with the claws of the drive rail 29, allowing the balance weight 20 to move forward and backward. Furthermore, a front sensor 23 and a rear sensor 24 are provided to detect the movement position of the balance weight 20.

[0022] 3 is a block diagram of the automatic control, in which the control device 25 receives the traveling speed calculated from the rotation of the tail wheel 11 from the traveling sensor 10, an on / off signal for the main clutch lever 4, the output position of the throttle lever 5, the gear position of the speed change lever 14, the forward / backward movement position of the balance weight 20 from the position adjustment dial 6, a signal that the balance weight 20 has reached its front end from the front sensor 23, and a signal that the balance weight 20 has reached its rear end from the rear sensor 24. The control device 25 also outputs an on signal to the traveling clutch 27, a stop signal to the engine stop switch 18, a forward / reverse drive signal to the electric motor 21, and an on / off signal to the rotary clutch 13 via the on / off solenoid 12.

[0023] Figure 4 is a flowchart of engine control by the travel sensor 10. If the rotation speed of the tail wheel 11 detected in step S1 exceeds the rotation speed corresponding to the travel speed during normal tillage work or increases rapidly in step S2, the engine stop switch 18 is activated in step S3 to stop the engine 15. After that, when the engine 15 is started in step S5, it is determined in step S6 whether the engine start conditions (main clutch disengaged, gear position neutral, or throttle lever at minimum) are met, and if they are met, the engine 15 is started in step S7.

[0024] 5 shows tillage drive control by moving the balance weight 20 forward and backward. When the position adjustment dial 6 is operated in step S21 and the electric motor 21 is driven in step S22 to move the balance weight 20 forward and backward, the front and rear sensors 23, 24 detect the balance weight 20 in step S23. It is determined in step S24 which of the front and rear sensors 23, 24 detected the balance weight 20. If it is the front sensor 23, the on / off solenoid 12 is activated in step S25, the rotary clutch 13 is disengaged in step S26, and the rotation of the tillage blade 8 is stopped in step S27. Also, when the rear sensor 24 detects the balance weight 20, the on / off solenoid 12 is activated in step S28, the rotary clutch 13 is engaged in step S29, and the rotation of the tillage blade 8 begins in step S30.

[0025] Therefore, when the balance weight 20 is moved forward, the load on the handle 3 is reduced, and when it is lifted, the rotation of the tilling blade 8 stops, allowing safe turning operation, and when the balance weight 20 is moved backward, the tilling blade 8 is inserted into the cultivated land, starts to rotate, and tilling work can be performed.

[0026] Figure 6 shows the lower end of the rotary case 2K, which allows the tillage shaft 7 to protrude to the left and right, and case reinforcing plates 35 are attached with bolts 34, sandwiching them from the left and right, sharing the same tightening bolt holes of the rotary case 2K, which is formed by sheet metal molding, to prevent oil leakage from inside the rotary case 2K. This reinforcing plate 35 can be attached to the rotary case 2K after the tillage blade 8 has been removed from the tillage shaft 7, allowing for additional reinforcement. [Explanation of symbols]

[0027] 1 Running wheel 3 Control handle 5 Throttle lever 6 Motor Control Switch 7 Cultivation axis 8 Cultivating Claws 10 Travel sensor 11 tail wheel 13 Tillage clutch 14 Gear shift lever 15 Engine 16 Alternator 17 Battery 20 Balance weight 21 Electric motor 23 Front sensor 24 Rear sensor 26 Slide pin 28 Slide rail 29 Drive

Claims

1. This walk-behind cultivator has tilling tines (8) attached to the bottom of the body and is operated by gripping a steering handle (3) attached to the rear of the body. It is equipped with a travel sensor (10) that detects the rotation of a tail wheel (11) that rotates while in contact with the ground as the body travels, and calculates the travel speed from the number of rotations detected by the travel sensor (10). When a speed change exceeding the normal working speed or reverse travel is detected during forward work, travel stop control or engine stop control is performed.

2. 2. The walk-behind cultivator according to claim 1, wherein the engine (15) can be started by disengaging the traveling clutch (27), by placing the throttle lever (5) in the lowest speed position, or by placing the speed change lever (14) in the neutral position.

3. A walk-behind tiller as described in claim 1 or claim 2, in which a battery (17) and an alternator (16) are arranged forward of the running wheels (1) provided at the bottom of the machine body, a tilling shaft (7) supporting the tilling tines (8) is provided at the rear of the machine body, and a balance weight (20) that moves in the fore-and-aft direction of the machine body is provided.

4. A walk-behind cultivator as described in claim 3, wherein a balance weight (20) is provided which engages with a drive tool (29) of a slide rail (28) provided in the fore-and-aft direction of the machine body by a pair of front and rear slide pins (26), an electric motor (21) is provided which engages with the drive tool (29) and slides back and forth, and a motor control switch (6) which controls the drive of the electric motor (21) is provided on the steering handle (3).

5. A walk-behind cultivator as described in claim 4, characterized in that front and rear sensors 23, 24 are provided to detect the front and rear movement of the balance weight 20, and the tilling clutch 13 is disengaged when the front sensor 23 detects the balance weight, and the tilling clutch 13 is engaged when the rear sensor 24 detects the balance weight.

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