JP3799848B2 - Marchingmore - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mulching mower that is chopped finely while being moved in a mower deck and dropped between turf eyes.
[0002]
[Prior art]
Conventionally, such mowers are provided with a cutting blade in the mower deck and a guide body surrounding the outer periphery of the mower. There is a form to cut finely with a cutting blade.
[0003]
[Problems to be solved by the invention]
However, in such a conventional apparatus, it is desirable that the blade portion of the short blade is located below the deck ceiling by a predetermined distance. In other words, the position of the blade portion of the short blade is a predetermined distance from the blade portion of the long blade. An upwardly spaced position is appropriate. In other words, since the turf grass cut with the long blade is raised, the blade portion of the short blade is higher than the blade portion of the long blade, and this is because it has a high moisture content. The more turf grass is, the more conspicuous. Therefore, the gap between the ceiling of the deck and the short blade becomes narrow (Fig. 18), and the mowing lawn tends to stagnate here, eventually becoming overloaded and hindering continued work. There is. In addition, turfgrass becomes convective in a narrow space, becoming overcrowded, and noise due to rubbing with the ceiling is likely to occur.
[0004]
[Technical means for solving the problems]
The present invention is intended to solve the above-described problems, and is also intended to smooth the flow of the cut grass. For this reason, this invention took the following technical means. That is, the cutting blade of the mulching mower that surrounds the outer periphery of the cutting blade that rotates in the mower deck with an arcuate guide body is composed of a long blade and a short blade, and these are shifted in phase in the rotational direction and supported on the rotating shaft. In addition, the above-mentioned short blade that is slashed downward while chopping cut grass cut with a long blade is formed so as to gradually approach the deck ceiling as it goes from the shaft support position to the outer periphery. To do.
[0005]
Also, in the above, the configuration of the mulching mower in which the long blade is pivotally supported on the rotating shaft with the short blade on the lower side and the lower blade on the rotating shaft, and the cutting blade height of the lower long blade is provided at substantially the same height as the lower edge of the guide. To do. Furthermore, the lower blade is supported on the rotating shaft with the lower blade on the lower side and the lower blade on the upper side, and the blade part (b) of the lower long blade forms an angle upward from the cutting edge, and the blade part (b) of the upper short blade Has a mulching mower structure provided to form a downward angle from the blade edge.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. First, in terms of configuration, reference numeral 1 denotes a tractor as an example of a powered vehicle, which includes front wheels 2 and 2 and rear wheels 3 and 3, and the transmission power in the transmission case 6 is used to transmit the rotational power of the engine 5 mounted on the front of the fuselage. It is configured to decelerate appropriately through (not shown) and transmit this to the front wheels 2, 2 and the rear wheels 3, 3.
[0007]
The transmission case 6 is provided with a hydraulic continuously variable transmission, and when the forward / reverse pedal (not shown) provided on the right side of the floor 7 is depressed, the machine body moves forward or backward. A rear PTO shaft 9 projects from the rear portion of the transmission case 6, and a mid PTO shaft 10 projects from the center lower portion toward the front.
[0008]
A mower deck 13 is attached to the lower part of the machine body via a link mechanism 12 so as to be movable up and down. Then, the mower deck 13 moves up and down to adjust the cutting height by operating a hydraulic control lever (not shown) on the right side of the seat in the front-rear direction. As shown in the figure, three sets of cutting blades 16, 16... Are supported in the mower deck 13 by rotating shafts 17, 17. The cutting blades 16, 16... Are rotated by obtaining power.
[0009]
These cutting blades 16, 16... Are surrounded by a cylindrical guide body 18 on the rotating outer peripheral side. Each of the cutting blades 16, 16... Is provided on the rotary shaft 17 by crossing a long lower blade 16 a and a lower upper blade 16 b in a cross shape, and a blade portion ( B) and an uprising wind generating portion 16c on the outer side, while a blade portion (b) is also provided on the front edge of the upper short blade 16b, and the cut grass is beaten on the outside. A knocking-off portion 16d for dropping is provided. The blade portion (A) of the long blade is configured to form an angle α with the blade tip facing downward, and the blade portion B of the upper short blade 16b is configured to form the angle β with the blade tip facing upward.
[0010]
Further, the short blade 16b is formed such that the connecting portion with the central rotating shaft 17 is at the lowest position so as to be separated from the ceiling of the mower deck 13 and the rotation trajectory has a mortar shape so as to gradually approach the ceiling. FIG. 4 is a perspective view of the guide body 18 that is fixed to the mower deck 13 in a suspended manner by means such as welding. The central guide body 18a protrudes forward from the left and right guide bodies 18b and 18c, and the adjacent parts are as follows. That is, the central guide body 18a is formed in a complete circumference, the outer periphery of the left and right guide bodies 18b, 18c is partially missing, and the edge formed by the lack is joined and fixed to the central guide body 18a. is there.
[0011]
Reference numeral 20 denotes a part of the central guide body 18a, which indicates a vertical wall serving as a partition wall of an adjacent portion, and the tip of the long blade (i) adjacent to the lower end does not interfere with the guide body. The notch 21 is present. In this embodiment, the adjacent portions of the guide body 18 are cut obliquely, and the triangular plate 23 is fixed by welding or the like. Thus, by fixing the plate 23 to the adjacent portion, the moving mowing grass is prevented from being caught by the corners of the guide bodies 18a and 18b. This oblique notch is only on the front side in the traveling direction, and the rear side leaves an upright edge to reduce the turf grass discharge movement.
[0012]
Further, the distance between the inner peripheral surface of the guide body 18 and the rotation locus C of the long blade 16a is such that the distance L2 on the rear side is wider than the distance L1 on the front side in the traveling direction (for example, L1 = 10 mm, L2 = 20 mm). The distance is gradually increased from the front side toward the rear side. Further, regarding the vertical positional relationship between the guide body 18 and the long blade 16a, the blade 16a must act directly on the lawn to be planted on the front side in the advancing direction so that the upper part of the blade 16a must be appropriately cut. The front lower end of the guide body 18 is set to a higher relationship. In the present embodiment, the blade 16a appears most at the connecting portion between the central guide body 18a and the left and right guide bodies 18b and 18b ((d) in FIG. 7), and is substantially aligned with the blade height on the end side (the same figure). Middle (e)). On the other hand, the lower end of the guide body 18 other than the front side is set to be equal to or lower than the position of the blade 16a to prevent the cut grass from scattering. Therefore, the cut grass cut off on the front side can be reliably dropped on the back side while being carried around.
[0013]
The vertical height of the guide body 18 is not constant, and the vertical lengths of the rear side of the central guide body 18a and the lower portions of the left and right guide bodies 18b are slightly shortened as shown in FIGS. ing. Accordingly, when the amount of turf or grass cut in each guide body 18 increases, fine cut grass or the like is discharged rearward through the gap s.
[0014]
In order to reduce grass spillage during the mulching operation, the apparatus of this embodiment is devised as follows. That is, as shown in FIG. 9, the mower deck 13 that wraps the guide body 18 is provided with a space portion of 90 mm or more (symbol A in the drawing) from the lower end portion of the cutting blade 16 (the blade portion (b) of the long blade). The distance from the lower end of the blade to the lower end of the cutting blade 16 is about 10 mm (symbol B in the figure).
[0015]
The overlap margin between the adjacent cutting blades when viewed from the plane also affects the uncut grass, and is set to about 30 mm in the apparatus described here. Therefore, even in a meandering state where the handle is cut to the left and right, the work can be continued stably without being left behind. Further, the peripheral speed of the cutting blade 16 is set to 76 m / sec. Reference numeral 25 denotes a gauge wheel.
[0016]
In the above example, when turf or grass cutting operation is performed, first, the gauge wheel 25 is adjusted up and down to set the cutting height, the engine 5 is rotated, and the mid PTO shaft 10 is rotated. Then, the three cutting blades 16 start rotating, and the tractor is moved forward (f) to cut grass and grass. That is, the planted turf that has dived at the lower edge of the deck as the tractor progresses and has been brought forward at the front edge of the guide body 18 is cut by the action of the long blade 16a. Since the tractor advances (f), the grass cut by the lower long blade 16a is lifted once and then further finely cut by the upper short blade 16b rotating integrally with the lower blade 16a. At the same time, it is released downward and dropped to the lower part of the guide body 17.
[0017]
The grass and grass that are finely cut in the individual guide bodies 17 fall between the grasses mainly from the interval between the inner peripheral edges of the guide bodies 18a, 18b, and 18c and the rotation locus (c) of the long blade 16a. FIG. 11 shows another embodiment. The difference from the above example is in the rotation direction of the rotary shaft 17 of the cutting blade 16, and in the above embodiment in which the rotation directions of all three axes are the same, the rotary shaft 17a of the central cutting blade is rotated forward, The rotary shafts 17b and 17c of the left and right cutting blades are reversed. That is, in the mulching mower shown in FIG. 11, the vertical axis for driving the cutting blade has a three-axis configuration, while the shaft of the central cutting blade located slightly forward is driven forward, while the right and left cutting blades are driven. Since the blade shaft is driven in reverse rotation, the cutting blades are configured to rotate and move in the same direction at the approach portion between the center and the left and right cutting blades, so that the finely cut grass collides with each other. Therefore, there is an effect that it falls while being smoothly carried around and does not impair the diffusion effect. In addition, 30 is a belt transmission mechanism, and 31 and 31 are reverse transmission cases.
[0018]
[Action and effect of the invention]
The present invention as described above, arc-shaped guide member the outer periphery of the cutting blade (16) which rotates in a mower deck (13) (18a, 18b, 18c) mulching mower of the cutting blade (16) long blade enclosed in ( configure out with 16a) and a short blade (16b), mulching mower for supporting the rotating shaft (17) and these in the rotational direction the phase-shifted Rutotomoni long blade (16a) a short blade to the lower the (16b) as a higher , The short blade (16b) that is slashed downward while chopping the cut grass cut by the long blade (16a) gradually approaches the deck (13) ceiling side from the pivot support position toward the outer periphery. since made by forming so, the blade (16b) is taken conical rotational locus, grass clippings being cut in the cone-shaped close to the long blade (16a) is While being sent and convected, the shredded action of the short blade (16b) is received, but this convection space is widened so that the mowing lawn does not stagnate and excessive load operation does not occur.
[0019]
Further, the lower long cutting blade height guides of the blade (16a) (18a, 18b, 18c) for providing substantially the same height as the lower edge of the lower, which lowers the upper short blade (16b) up to the limit Since it is attached as close as possible to the long blade (16a) on the side, a mortar-shaped space can be set large. Further, the blade portion (A ) of the lower long blade (16a) forms an angle (α) facing upward from the blade edge, and the blade portion (B) of the upper short blade (16b ) is angled downward from the blade edge ( Since the turf grass cut by the long blade (16a) is provided to form β) , the blade part (A) serves as a guide guide, and its direction becomes the rising side to promote the rising transition of the cut grass. The shredded turf shredded by the short blade (16b) plays the role of a guide guide in which the blade portion (b) faces downward, and promotes falling into the turf.
Furthermore, the distance between the inner peripheral surface of the guide body (18a, 18b, 18c) and the rotation locus (c) of the long blade (16a) is the rear distance (L2) with respect to the front distance (L1) in the traveling direction. ) Is widely provided, the cut grass cut off on the front side can be moved around and reliably fall on the back side of the grass.
[Brief description of the drawings]
FIG. 1 is an overall side view.
FIG. 2 is a plan cross-sectional view of the main part.
FIG. 3 is a side sectional view of a main part.
FIG. 4 is a perspective view of a guide body.
FIG. 5 is a perspective view of a blade.
FIG. 6 is a perspective view of a main part viewed from the bottom.
FIG. 7 is a front view of the guide body.
FIG. 8 is a rear view of the guide body.
FIG. 9 is an operation explanatory diagram.
FIG. 10 is a plan view of a mower deck.
FIG. 11 is a plan view of a mower deck according to another embodiment.
FIG. 12 is a plan view of a blade.
FIG. 13 is a front view of a blade.
FIG. 14 is a bottom view of the blade.
FIG. 15 is a rear view of the blade.
FIG. 16 is a left side view of the blade.
FIG. 17 is a right side view of the blade.
FIG. 18 is a conventional sectional side view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tractor, 2, 2 ... Front wheel, 3, 3 ... Rear wheel, 5 ... Engine, 6 ... Mission case, 7 ... Floor, 9 ... Rear PTO shaft, 10 ... Mid PTO shaft, 12 ... Link mechanism, 13 ... More deck 16, 16 ... Cutting blade, 16a, 16b ... Blade, 17 ... Rotating shaft, 18, 18a, 18b, 18c ... Guide body, 20 ... Vertical wall, 21 ... Notch, 23 ... Plate, 25 ... Gauge wheel

Claims (1)

Arcuate guide member the outer periphery of the cutting blade (16) which rotates in a mower deck (13) (18a, 18b, 18c) mulching mower of the cutting blade (16) long blade enclosed in (16a) and a short blade (16b ) and de configured in mulching mower for rotatably supporting the rotating shaft (17) of them in the direction of rotation the phase-shifted Rutotomoni long blade (16a) a short blade to the lower (16b) as the upper, the long blade (16a The short blade (16b) that is slashed downward while shredding the cut grass cut in step ) is formed so as to gradually approach the deck (13) ceiling side from the pivot support position toward the outer periphery . The cutting blade height of the long blade (16a) is provided at substantially the same height as the lower edge of the guide (18a, 18b, 18C), and the blade portion of the lower long blade (16a) ( B) forms an angle (α) pointing upward from the cutting edge, and the blade portion (b) of the upper short blade (16b) is provided to form an angle (β) pointing downward from the cutting edge. 18a, 18b, 18c) and the rotation trajectory (c) of the long blade (16a) have a wider rear interval (L2) than the forward interval (L1) in the traveling direction. Martingmore.

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