JPH0657103B2 - Lawn mower - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lawn mower used for extracting weeds from a golf course or the like.

[Prior Art] A weeding machine has recently been proposed in which two rolls pressed against each other or between the roll and the endless belt or the endless belts are pressed against each other to rotate, and the grass is sandwiched between them to pull out. As shown in FIG. 4, for example, this weeding machine is made up of a rubber roll 6 and rubber on a machine body 1 configured to be movable on the ground by a front wheel 2 and a rear tail wheel 4. When the endless belt 14 and the endless belt 14 are arranged so as to be pressed against each other near the ground and rotated in the directions indicated by the arrows, the grass 18 is drawn between the rubber roll 6 and the endless belt 14 and pulled out. In this case, the degree of being caught by the roll differs depending on the size of the grass and the thickness of the bush, so if both the roll 6 and the endless belt 14 are made of metal,
At the same time, if grasses with different thicknesses are sandwiched between the roll 6 and the belt 14, the thicker grasses will be pulled out, but the thinner grasses will come out because the gap between the grasses will be larger due to the thicker grasses. There was often the phenomenon of not being present.

Therefore, conventionally, the rubber roll is used as described above, but if the elasticity of the rubber roll is too good, there is a problem that the rubber roll catches the grass but cannot pull it out. Various elastic bodies have been studied in order to solve such drawbacks, but in each case, a thick sward grass and a thin sward grass,
Alternatively, it was impossible to find a roll having elasticity such that a bundle of many grasses and a bundle of small grasses were sandwiched at the same time and both of them could be pulled out efficiently at the same time.

Also, since a flat belt is used as the endless belt 14, even when the grass is dry, if weeds or grass are caught between the belt 14 and the driving rollers 15 and 16 that rotate the belt 14 or the rubber roll 6, 14 shows a disadvantage that the belt meanders and rides over the flange portion at the end of the driving roller, and finally the belt is broken. Furthermore, under such a circumstance, if the belt meanders to the right, the tension on the right side of the belt becomes too tight, and grass removal is not performed uniformly over the entire width of the belt, resulting in a poor weeding rate. In addition, when the lawn is wet, such as in the case of rain, the rubber roller, endless belt, and drive roller are made of rubber or vinyl, which may cause water-leakage slips, meandering, and grass. In addition, since it is damp and cannot be removed, it cannot be used in rainy weather.

In FIG. 4, 7 and 8 are brushes, 9 is an arm for supporting the rubber roll 6, 10 is a support shaft, which is attached to a shaft rod 12 which penetrates a receiving member 19 whose one end is fixed to the machine body 1 and is adjusted. The roll 6 is pressed against the endless belt 14 by the spring 11 whose spring force is adjusted by the pressure nut 13. 17 is a grass support, 3 is a rod for determining the height position of the tail wheel 4, 5 is a receiving rod, and 5'is a nut.

[Problems to be solved by the invention]

The present invention is to solve the above conventional problems,
It is possible to pull out a thick grass or a thin grass at the same time, or a large amount of grass bundles and a small amount of grass bundles at the same time. It is intended to provide a lawnmower equipped with a roll.

[Means for solving problems]

The lawn mower of the present invention comprises a body configured to be movable on the ground, a rotary drum provided with axially oriented grooves on the circumferential surface at substantially equal intervals, and a rotary drum having a diameter smaller than that of the drum. A pulling roller having a diameter larger than the width of the groove is provided in a pressure contact state so that the contact portion between the two is close to the ground, and the drum and the pulling roller sandwich the grass growing on the ground and pull it out. It is characterized in that it is adapted to rotate.

In the present invention, the rotary drum has a surface made of an elastic material such as rubber, and the groove is provided in the width direction of the drum. However, the groove may be provided so as to have a tooth shape similar to that of an ordinary gear. May have a semicircular cross section. Both the rotating drum and the take-out roller have a rubber-lined surface like the rubber roll. Similarly, the take-out roller may be a rubber roll.

[Action]

According to the present invention, the rotary rubber drum is provided with a large number of grooves in the shape of a gear in the axial direction of the drum, and the extraction roller is provided so that a part of the groove is fitted into the groove. The removed grass is pressed by the extraction rollers at both ends of the width of the groove, so that the grass can be reliably sandwiched even if the grass is wet. Also, because deformation occurs at the edges of the width of the groove,
The groove of the drum can be easily deformed for both thick grass and thin grass, and both can be sandwiched at the same time.

〔Example〕

 Hereinafter, the present invention will be described with reference to an example.

FIG. 1 is a side view for explaining a lawnmower of the present invention, in which 1 is a machine body, 2 are wheels, 4 is a tail wheel, and 20 is a rotary drum having a groove like a gear on its peripheral surface, Reference numeral 21 indicates a take-out roller. This weeding machine is designed to move in the left direction (the direction of the arrow) in the figure, and the rotary drum 20 and the take-out roller 21 sandwich the grass to pull it out, or cut it into pieces that cannot be pulled out. It is becoming like this. The removed grass 18 is raised on the guide plate 26, but the grass 18 is removed by the rotating brush 22.
It's getting hit by the water. The rotary drum 20 is pivotally supported on the lower end of an arm 27, and this arm 27 is a fulcrum.
A pulling force of a spring 30 applied to a shaft 29 provided at the other end of the arm 27 around 28 is pressed against the take-out roller 21. One end of the spring 30 is attached to a shaft rod 31 which is inserted into the receiving member of the machine body 1, and a nut 32 attached to the shaft rod 31 allows the tension force of the spring 30 to be adjusted. ing. In the case of this example, the rotating drum 20 is
Since it is pressed against, the drum 20 can easily move and slip even in the case of thick grass. When the spring is used under pressure, the spring contracts, which may limit the thickness and amount of the grass to be caught.

The pressure contact state between the rotary drum 20 and the extraction roller 21 of the lawn mower of the present invention will be further described as shown in FIG. A part of the extracting roller 21 is inserted between the tooth portions 20a and 20a formed by the groove 20b of the rotary drum 20, that is, in the groove 20b.
It is advisable not to slip into the groove 20b but to leave a gap as shown in the figure. FIG. 3 shows a modification of the groove 20b, and the groove bottom may be semicircular or semielliptical.

In the lawn mower of the present invention, since the rotary drum 20 is provided with a groove, the extraction roller 21 abuts both tooth portions 20a, 20a formed by the groove, so that the grass to be extracted can be more reliably sandwiched. You can pluck or shred the cans. In the summer, the growth of grass is rooted and the roots are tight.Therefore, more grass may be shredded than the ones to be removed.In this case, the grass height is not uniform, so a lawnmower is installed behind the rotary drum 20. It is good to provide. In FIG. 1, 23 is a lawn mowing cutter drum having a blade 25, and 24 is a lawn mowing blade. This lawnmower is detachable from the machine body 1 and is not attached when it is unnecessary.

The body 1 can adjust its position with respect to the ground by raising and lowering the tail wheel 4 attached to the other end of the arm 33 whose one end is pivotally supported by the shaft 34, by raising and lowering means (not shown). It has become. The tail wheel may be a single iron roll or a normal wheel. In FIG. 1, 35 and 36 are chains for driving a rotary drum, a lawn mowing cutter drum, and the like, and 37 is an engine. The first
In the illustrated example, the take-out roller 21 is adapted to be driven by the rotary drum 20, but it goes without saying that it may be driven.

Alternatively, the extraction roller 21 may be a hollow rubber roller in the shape of an automobile tire. When such a hollow rubber roller is used, even if a thick grass and a thin grass are caught at the same time, the fluid (air etc.) in the roller moves and is deformed, so that both can be properly sandwiched. Have advantages.

As a specific example of the embodiment, the outer diameter of the rotating drum 20 is 120 mm,
Good results were obtained with a groove width of 10 mm, a groove depth of 10 mm, an extraction roller 21 outer diameter of 24 mm, and a rotating brush 23 outer diameter of 150 mm.

〔effect〕

Since the endless belt is not used in the weeding machine of the present invention, there is no problem that the weeding machine cannot be performed due to the meandering of the belt unlike the conventional weeding machine. Since the rotary drum is provided with the grooves, the grass is sandwiched at two positions at both ends of the groove width, so that the grass can be surely removed even when the grass is wet due to rainy weather.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the lawn mower of the present invention, FIGS. 2 and 3 are cross-sectional views of a main part showing respective examples of the groove shape of the rotary drum, and FIG. It is a side view of a weeding machine. In the figure, 1 ... Machine body 20 ... Rotating drum 21 ... Extraction roller 22 ... Rotating brush 23 ... Lawn mowing cutter drum

Claims (1)

[Claims] Claims: 1. A rotating drum having grooves of a suitable width oriented in a direction parallel to an axis and provided on a peripheral surface thereof at substantially equal intervals in a body constructed to be movable on the ground, and having a diameter smaller than that of the drum. Further, a take-out roller having a diameter slightly larger than the width of the groove is provided in a pressure-bonded state so that the contact portion between the two is close to the ground, and at least one of the drum and the take-out roller is made of an elastic member such as rubber on the surface. The lawn mowing machine is characterized in that the drum and the extraction roller are rotated in a direction of extracting the grass growing on the ground.