JPH0433403B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a grass collecting section structure of a lawn mower configured to send cut grass through a duct into the grass collecting section using conveying air from a mower.

[Conventional technology]

In a lawn mower, a structure for detecting whether the grass collecting section is full includes a structure in which an air volume sensor is installed in the duct described above.

This is because when the grass collection section on the downstream side of the airflow sensor becomes full, the conveyed air from the mower cannot escape through the grass collection section and the airflow inside the duct decreases, so the airflow sensor detects this phenomenon. A warning is given by a buzzer or lamp.

[Problem to be solved by the invention]

In the above-mentioned structure, even if the grass collecting section is full of cut grass and the conveyance air is blocked, the conveyance air will still be sent into the duct from the mower on the upper side, so the wind speed inside the duct will decrease. There are cases where it is difficult to lower the level.

Therefore, the wind speed inside the duct during lawn mowing work,
When the grass collection section is full of cut grass, the difference in wind speed in the duct may not be sufficient, and the air volume sensor cannot accurately detect when the grass collection section is full of cut grass. occurs.

An object of the present invention is to provide a structure that can accurately detect when the grass collection section is full of cut grass.

[Means for Solving the Problems] The feature of the present invention is that the grass collecting portion structure of the lawn mower as described above is configured as follows.
In other words, the grass collection section is equipped with a breathable grass collection bag for collecting grass clippings, and the structure is such that the conveying wind is discharged from the grass collection bag, and when the grass collection bag is full of grass clippings, A auxiliary air exhaust path for discharging the conveying air is provided in the grass collecting section, and a mown grass stopping member is provided on the lower side of the mowed grass stopping member to stop the grass clippings in the auxiliary air exhaust path and allow the conveying air to pass through. An airflow sensor is also provided.

[Effect]

With the above configuration, during lawn mowing work, the conveying air from the mower and the grass clippings are sent through the duct to the grass collecting bag in the grass collecting section. In this case, if the cross-sectional area of the auxiliary air exhaust path is set to be sufficiently small, the conveying air will pass through the grass collection bag having a large cross-sectional area and be exhausted to the outside. In other words, the amount of conveying air passing through the sub-exhaust passage is small.

When the grass collection bag is full of grass clippings, the grass clippings block the passage of the conveyance air through the grass collection bag, so the conveyance air from the mower is discharged to the outside through the sub-ventilation channel. The state changes to In this state, the amount of conveying air passing through the sub-exhaust passage becomes large, so it is sufficient to detect changes in this air quantity using the air-volume sensor of the sub-exhaust passage.

Furthermore, since the airflow sensor is located on the lower side of the mowed grass stopping member, even if the grass clippings try to flow toward the airflow sensor side, the mowed grass stopping member will stop it. This prevents grass clippings from getting tangled with the airflow sensor, which prevents the sensor from operating properly, and the sensor always operates normally.

〔Effect of the invention〕

As described above, in the structure that detects when the grass collecting section is full based on changes in the air volume, there is a significant difference in the air volume detected before and after the grass collection part becomes full.
Furthermore, the air volume sensor could be configured to always operate normally.

This improved the accuracy with which the airflow sensor detects the full state and improved work efficiency.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 4, an engine 3 is provided at the front of the aircraft supported by front wheels 1 and rear wheels 2, a control section 4 is provided at the center of the aircraft, and a mower 5 is provided between the front and rear wheels 1 and 2. The riding-type lawn mower is structured such that the mowed grass is fed through a duct 6 to a grass collecting section 7 at the rear of the machine body.

As shown in FIGS. 1 and 4, the grass collection section 7 includes an upper hood 8 made of resin, and grass collection bags 9A and 9B made of breathable cloth and detachable from the upper hood 8.
The duct 6 is connected to the upper hood 8.
The grass input port 8a is inserted into the grass input port 8a provided in the grass input port 8a.
Then, a dustproof net 1 is placed on the opposite side of the grass input port 8a.
0 (corresponding to a grass clipping member) is stretched to form a downward sub-air exhaust passage 11, and a propeller-type air volume sensor 12 is installed on the lower side of the dustproof net 10 in this sub-exhaust air passage 11. is installed.

At the start of work, as shown in FIG. The conveying wind mainly escapes from this grass collection bag 9A. When the grass collection bag 9A on the grass input port 8a side is filled with grass clippings, the flow of the grass clippings is transferred to the adjacent grass collection bag 9B, and the grass clippings are transferred to the grass collection bag 9B next to the grass collection bag 9B.
As the grass accumulates inside, the conveying air from the mower 5 mainly escapes from the grass collecting bag 9B.

When both grass collection bags 9A and 9B are filled with grass clippings, as shown in FIG.
It is not possible to escape from the duct, and the auxiliary air exhaust passage 11 is used as the auxiliary exhaust passage.

The cross-sectional area of the sub-air exhaust passage 11 is set to be sufficiently smaller than the passage area through which the conveying wind of the grass collection bags 9A and 9B can escape, so that both the grass collection bags 9A and 9B can be mowed. When the conveying air leaves the sub-exhaust passage 11 after being filled with grass, it leaves at a sufficiently high speed and rapidly rotates the air volume sensor 12. Therefore,
This phenomenon is detected electrically and the operator is warned by a buzzer or lamp.

[Another example]

As shown in FIG. 3, a structure may be adopted in which the sub-air exhaust path 11 and the air volume sensor 12 are provided on the grass input port 8a side. However, in this case, it is preferable to provide an auxiliary guide 13 in the grass input port 8a so that the cut grass is fed from the side of the grass collection bag 9B that is far from the grass input port 8a.

[Brief explanation of drawings]

The drawings show an embodiment of the structure of the grass collecting section of the lawn mower according to the present invention, and FIG. 1 is a longitudinal sectional front view of the grass collecting section showing the state in which the conveying air flows out during lawn mowing work, and FIG. 2 is the grass collecting section structure. A longitudinal sectional front view of the grass collecting section showing the state in which the conveying air escapes when the grass section is full of cut grass, FIG. 3 is a longitudinal sectional front view of the grass collecting section showing another embodiment, and FIG. 4 is a riding type. FIG. 2 is an overall side view of the lawn mower. 5... Moa, 6... Duct, 7... Grass collection section,
9A, 9B... Grass collection bag, 10... Grass clipping member,
11...Sub-exhaust duct, 12...Air volume sensor.

Claims (1)

[Claims] 1 A grass collecting section structure of a lawn mower configured to send cut grass into a grass collecting section 7 through a duct 6 by a conveying wind from a mower 5, and the grass collecting section 7 has a structure for collecting cut grass. The grass collection bags 9A, 9B are provided with air permeability, and the conveying air is discharged from the grass collection bags 9A, 9B.
A sub-air exhaust passage 11 is provided in the grass collecting section 7 to discharge the conveying air when B is full of cut grass, and the grass clippings are stopped in the auxiliary air exhaust passage 11 to allow the conveying air to pass through. This grass collection part structure of a lawn mower is provided with a mown grass stopper 10 and an airflow sensor 12 located on the downstream side of the cut grass stopper 10.