JPS589645B2 - mowing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mowing machine, and an object of the present invention is to provide a movable movable blade drive hole and an eccentric pin that can be easily connected to each other.

FIG. 1 shows a conventional example of the present invention. In the figure, reference numeral 6 is a mower housing, and a drive mechanism consisting of a motor 7, a drive gear 1, etc. is built inside. An opening is provided below to accommodate a fixed blade 3 and a movable blade 4.

The drive gear 1 is disposed at the bottom of the drive mechanism mounting plate 8 so as to be rotatable in the horizontal direction, and meshes with the output gear 9 of the motor 7.

And an eccentric pin 2 protruding downward from the lower surface of the drive gear 1
is fitted into a drive elongated hole 5 formed at the rear of the movable blade 4 and perpendicular to the sliding direction of the movable blade 4, and as the drive gear 1 rotates, the movable blade 4 is guided through the eccentric pin 2 into the elongated hole. 21 in the front-back direction.

By the way, in order to attach the movable blade 4 and the fixed blade 3 to the lower part of the mowing machine housing 6, the double blade 3, With 4 stacked on top of each other, fix the fixed blade 3 with screw 1.
This is done by screwing the trimmer casing 6 around the opening of the trimmer housing 6 using the screws 7.

However, in the conventional example as described above, since the eccentric pin 2 is fixed to the drive gear 1, it is necessary to align the drive slot 5 of the movable blade 1 with the eccentric pin 2 when installing the movable blade 4. Although it has to be done in advance, the movable blade 4 is different from the fixed blade 3.
It is very difficult to move the blade back and forth due to the sliding resistance of the blade.
Therefore, this alignment work is difficult, and there is a drawback that it is difficult to attach and detach the movable blade 4 and the fixed blade 3.

The present invention has been made in view of the above points, and will be explained in detail below using Examples.

In this embodiment, the parts other than the drive gear 1 and the movable blade 4 are substantially the same as those of the conventional example.

FIG. 2 shows a cross-sectional view of the drive gear 1. The above drawbacks can be solved by holding the eccentric pin 2 so that it can move up and down relative to the drive gear 1, and by biasing it downward with a spring. It is something that can be done.

In other words, a stepped hole 10 is drilled at a predetermined position eccentric from the center of rotation of the drive gear 1, and the stepped hole 10 passes through the drive gear 1 vertically.
An eccentric pin 2 is inserted from above the drive gear 1, and the lower end of the eccentric pin 2 projects downward from the lower part of the drive gear 1 so as to be able to move up and down.

At the top of the eccentric pin 2, there is a head 2a that is larger than the inner diameter of the lower hole 10b and slightly smaller than the inner diameter of the upper hole 10a.
The amount of downward protrusion is regulated by.

The drive gear 1 is also configured to close the upper opening of the upper hole 10a.
A coil spring 13 is inserted between the lower surface of the lid 12 fixedly arranged on the upper surface by a screw 11 and the head 2a, and constantly biases the eccentric pin 2 downward. There is.

In order to attach the fixed blade 3 and the movable blade 4 to the mower housing 6, the movable blade 4 is tightly connected to the upper surface of the fixed blade 3 using the presser plate 15, and then both sides of the fixed blade 3 are attached to the mower housing. body 6
It is removably attached to the mower housing 6 by fixing it to the periphery of the lower opening of the mower with screws 17 and 17.

However, when the fixed blade 3 was installed in the correct position,
If the drive slot 5 of the movable blade 4 and the eccentric pin 2 do not match in position, the upper surface of the movable blade 4 will cause the eccentric pin 2 to be moved by the biasing force of the coil spring 13, as shown in FIG. However, when the motor 7 is moved and the drive gear 1 is rotated, the eccentric pin 2 is in elastic contact with the upper surface of the movable blade 4 as the drive gear 1 rotates. When the eccentric pin 2 moves circumferentially and eventually reaches the drive slot 5, the lower end of the eccentric pin 2 fits into the drive slot 5 due to the spring force of the coil spring 13 as shown in FIG. become.

The movable blade 4 has a guide elongated hole 2 into which a screw 23 is inserted so that the movable blade 4 can move linearly in the front-rear direction relative to the fixed blade 3.
1 is provided, but by setting the length of the guide elongated hole 21 to be the same length as the rotational diameter of the eccentric pin 2, the driving elongated hole 5 exists within the rotation range of the eccentric pin 2, and The eccentric pin 2 can be reliably fitted to the eccentric pin 2 during one rotation, and the drawbacks of the conventional example described above can be solved.

However, since the length of the guide slot 21 is the same as the rotating diameter a of the eccentric pin 2, when the movable blade 4 slides back and forth, the end face of the guide slot 21 collides with the screw 23, which serves as a guide pin. This results in a problem that causes noise and vibration.

Therefore, in the present invention, the length of the guide elongated hole 21 is made longer by a predetermined length b than the rotational diameter a of the eccentric pin 2, and the length of the guide elongated hole 21 is further made longer by a predetermined length b. In order to prevent the drive slot 5 from shifting out of the rotation range of the eccentric pin 2 as shown in FIG.
As shown in FIG. 6A and 6B, an auxiliary groove 24 is provided around the driving elongated hole 5.

The width of this auxiliary groove 24 is longer than a predetermined length b, which is longer than the rotational diameter a of the eccentric pin 2, at the front and back of the elongated hole 5, and the width of the guide elongated hole 21 is longer than the rotational diameter a of the eccentric pin 2, and the width is at least a predetermined length b, which is longer than the rotational diameter a of the eccentric pin 2. An inclined surface 25 extending up to this point is provided on the outer periphery of the driving elongated hole 5.

7A to 7C show the operation of the present invention, in which the drive gear 1
The parts are similar to the embodiment shown in FIG.

When the movable blade 4 and the fixed blade 3, which are connected by the presser plate 15 and the screw 23, are installed in the lower opening of the mower housing 6, if the drive slot 5 of the movable blade 4 is connected to the eccentric pin 2 Even if the eccentric pin 2 is at a position that is out of the rotation range, the eccentric pin 2 will always fall into the auxiliary groove 24 as shown in Fig. As shown in FIG. 7, it moves upward on the inclined surface 25 against the spring biasing force of the coil spring 13, and eventually fits into the drive slot 5 as shown in FIG. 7C.

FIG. 5 shows an external view of the mower, in which a handle portion 20 provided with a switch 18 and a power cord 19 is formed at the rear of the mower housing 6.

As described above, in the present invention, in the mowing machine, the auxiliary groove is provided at the front and rear of the drive slot, so that when the movable blade and the fixed blade are attached, the drive slot of the movable blade is located beyond the rotation range of the eccentric pin. Even if it becomes misaligned, by rotating the eccentric pin, the eccentric pin will fall into the auxiliary groove, and eventually it will automatically fit into the drive slot, making it easier to attach the movable blade and fixed blade. This has the advantage that it can be easily carried out without considering the alignment between the drive slot and the eccentric pin.

Furthermore, since the eccentric pin is supported so as to be able to move up and down relative to the drive gear, and is biased downward by a spring, the long hole for driving the movable blade will not be misaligned with the position of the eccentric pin when the movable blade is installed. However, the situation in which the eccentric pin moves upward and the double-edged blade cannot be attached can be prevented, and the assembly work can be carried out easily.

[Brief explanation of drawings]

Fig. 1 is a partially omitted sectional view of a conventional example of the present invention, Figs. 2 to 4 are explanatory views of the present invention, Fig. 2 is a sectional view of the drive gear portion, and Fig. 3 A and B are respectively FIG. 4 is an enlarged top view of the movable blade. 5 to 7 show an embodiment of the present invention. FIG. 5 is an external view of the mower, FIG. 6A is a top view of the main part of the movable blade, and A sectional view taken along the line A--A in FIG. 1A, and FIGS. 1 is a drive gear, 2 is an eccentric pin, 3 is a fixed blade, 4 is a movable blade, 5 is a long hole for driving, 24 is an auxiliary groove, and 25 is an inclined surface.

Claims (1)

[Scope of Claims] 1. From the bottom surface of the drive gear, a hole is drilled in the rear of the movable blade that is placed on the top surface of the fixed blade so as to be slidable back and forth, and is perpendicular to the sliding direction of the movable blade. In a mower that drives a movable blade reciprocatingly with respect to a fixed blade by fitting an eccentric pin protruding downward, auxiliary grooves are provided at the front and rear of the long drive hole to allow the eccentric pin to move up and down relative to the drive gear. A mowing machine characterized by being movably supported and biased downward by a spring. 2. The mowing machine according to claim 1, wherein the auxiliary groove is provided with an inclined surface that reaches the upper end of the drive slot.