JPH09233946A - Trimmer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compose a change gear mechanism part which is not damaged even if abnormally large transmission torque is added. SOLUTION: At the tip of the rotary drive shaft 2 of a motor 1, a first pulley and the second pulley 6 in parallel to the first pulley 3 are arranged. The first pulley 3 and the second pulley 6 are connected by a V belt 12. The second pulley 6 is provided with the eccentric circular cam 11 composed of the disks 9 and 10 in which a first blade 13 and a second blade 14 are fitted, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trimmer for cutting plants and the like.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional trimmer. As shown in the figure, in the conventional mower, the rotary drive shaft 2 of the motor 1 is
By the pinion gear 15 provided at the tip, the rotation of the rotary drive shaft 2 is transmitted to the gear 16 provided with the eccentric cam 11 composed of the two discs 9 and 10 arranged eccentrically, and the rotational movement of the gear 16 is performed. Due to the eccentric rotational movement of the disks 9 and 10, the first blade 13 and the second blade 14 fitted to the disks 9 and 10 reciprocate with each other.

[0003]

As described above, in the conventional mower, the blade 1 is provided by using the gear device.
Since the first blade 1 and the second blade 13 and 14 are configured to operate, the first blade 1 may be cut by a hard substance such as wire between cutting blades of the first and second blades 13 and 14 during cutting.
3. If the second blade 14 suddenly stops, an abnormally large transmission torque is applied to the gear device due to the rotational power of the motor 1 and the gears 15 and 16 may be damaged. An object of the present invention is to eliminate the above-mentioned conventional drawbacks and to provide a trimmer having a speed change mechanism that is not damaged even if an abnormally large transmission torque is applied.

[0004]

The above object can be achieved by constructing the speed change mechanism section with a pulley and a V-belt.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the trimmer of the present invention. Reference numeral 1 is a motor, and a first pulley 3 is fixed to a tip of a rotary drive shaft 2 by a screw 4 and a nut 5. Reference numeral 6 denotes a second pulley, which is rotatably fitted to a shaft 8 fixed by a holder 7 in a position parallel to the rotary drive shaft 2 and arranged in parallel with the first pulley 3. In addition, the second pulley 6
An eccentric cam 11 composed of two discs 9 and 10 eccentrically arranged with respect to the shaft center of the shaft 8 is fixed to the lower surface of the disc by means such as welding. Reference numeral 12 is a V belt, which is wound around the first pulley 3 and the second pulley 6 with appropriate tension, and transmits the rotational power of the rotary drive shaft 2 to the eccentric cam 11. Reference numeral 13 is a first blade, and 14 is a second blade, which are fitted to each other so that when the discs 9 and 10 of the eccentric cam 11 make eccentric rotational movements, they reciprocate in opposite directions. Furthermore, the first blade 13 and the second blade 14 are
Each of them has a plurality of cutting blades (not shown) toward the tip, and when reciprocating in opposite directions, the cutting blades of the first blade 13 and the second blade 14 are like scissors. Works and cuts off vegetation.

In the trimmer constructed as described above, the first
If a hard material such as wire is caught between the cutting edges of the blade 13 and the second blade 14, the first pulley 3 and the V-belt 12 slip and the motor 1 continues to rotate.
The pulley 6 does not rotate and the first blade 13 and the second blade 14 are stopped.

[0007]

As described above, according to the present invention, since the transmission mechanism is composed of the pulley and the V-belt, the pulley and the V-belt slip when an abnormally large transmission torque is applied, and, for example, the blade is cut. Even if a hard substance is caught between the blades, the transmission mechanism is not damaged.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view of essential parts showing an embodiment of a trimmer of the present invention.

FIG. 2 is a cross-sectional side view of essential parts showing an example of a conventional trimmer.

[Explanation of symbols]

1 is a motor, 2 is a rotary drive shaft, 3 is a first pulley, 6 is a second pulley, 9 and 10 are discs, 11 is an eccentric cam, and 12 is V.
Belt, 13 is the first blade, 14 is the second blade, 1
Reference numeral 5 is a pinion gear, and 16 is a gear.

Claims (1)

[Claims] 1. A motor, a rotary drive shaft of the motor, an eccentric cam for engaging and rotating the blade to reciprocate the blade, and a speed change mechanism for transmitting the rotation of the rotary drive shaft to the eccentric cam. A trimmer, wherein the speed change mechanism includes a pulley and a V-belt.