JPH0731248A - Mobile type grass mower - Google Patents

Abstract

PURPOSE:To obtain a mobile type grass mower capable of cutting grass over the front whole surface in the width direction of a machine body. CONSTITUTION:This mobile type grass mower is obtained by vertically installing a driving cylinder 1 having a driving shaft 2 fitted thereinto in the front of a machine body, installing a driving case 5 having a cutting blade driving mechanism 4 equipped therein under the driving cylinder 1, protrusively installing cutting blade driving shafts 6 and 7 for reciprocating and rotating at a prescribed angle with the cutting blade driving mechanism 4 in the driving case 5, protrusively installing cutting blade driving arms 8 and 9 in the cutting blade driving shafts 6 and 7 and further cutting blade holding arms 10 and 11 left and right in parallel in the driving case 5, transversely installing a cutting blade supporting bar 12 at the tips of the cutting blade holding arms 10 and 11, then forming an upper blade 13 and a lower blade 14 on the under side of the cutting blade supporting bar 12 so as to freely reciprocate respectively and connecting the upper blade 13 and lower blade 14 to the tips of the cutting blade driving arms 8 and 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled mower.

[0002]

2. Description of the Related Art A conventional blade driving device for a self-propelled mower using a hair clipper-type cutting blade is located in the center of the machine body so that the rotational power of the engine can be controlled by a crank mechanism or a crank mechanism. The eccentric mechanism such as a cam mechanism converts the rotational motion into a reciprocating linear motion, and the reciprocating linear motion part of the eccentric mechanism directly attaches the base of the cutting blade, so that it is set at a relatively low position. For this reason, for example, when cutting the side of a ridge in mowing ridges, it is necessary to tilt the ridge according to the slope of the ridge.
Although filed as No. 6, this mowing machine has a drawback that the grass on the front side of the drive case cannot be cut because the cutting blade is projected from the side of the drive case.

SUMMARY OF THE INVENTION An object of the present invention is to provide a self-propelled mower capable of mowing the entire front surface to solve the above-mentioned drawbacks.

[0004]

The gist of the present invention will be described with reference to the accompanying drawings.

A drive cylinder 1 is hung vertically in front of the machine body a, and a drive shaft 2 vertically installed in the drive machine 1 is separated from a small engine 3 for traveling installed in the machine body a to be rotatable. A drive case 5 provided with a cutting blade drive mechanism 4 under the drive cylinder 1
Two cutting blade drive shafts 6 and 7 reciprocally rotated at a predetermined angle by the cutting blade drive mechanism 4 are provided on the drive case 5, and the cutting blade drive arms are attached to the cutting blade drive shafts 6 and 7. 8 and 9 are projected toward the front side, and two cutting blade holding arms 10 are attached to the drive case 5.
・ 11 protruding in parallel at right and left at a predetermined interval, a cutting blade support bar 12 is installed horizontally at the tip of these two cutting blade holding arms 10, 11, and below this cutting blade support bar 12. An upper blade 13 and a lower blade 14 are reciprocally movable to the left and right, and the cutting blade drive arm 8 is attached to the upper blade 13 and the lower blade 14.
-The present invention relates to a self-propelled mower characterized by connecting the tip portions of 9.

Further, two cutting blade drive shafts 6 and 7 are vertically installed in parallel in a drive case 5 in which the cutting blade drive mechanism 4 is installed, and the respective cutting blade drive shafts 6 and 7 are bearing mechanisms 6 '. The cutting blade drive mechanism which is held by 7'and has its lower end projecting from the lower part of the drive case 5 to change the rotation of the drive shaft 2 into reciprocating rotary motion of a predetermined angle on the two cutting blade drive shafts 6 and 7. 4. The self-propelled mower according to claim 1, wherein each of the four mowers is provided.

[0007]

The operation of claim 1 will be described.

When the drive shaft 2 that has divided the rotational power of the small traveling engine 3 is rotated, the cutting blade drive mechanism 4 reciprocally rotates the cutting blade drive shafts 6 and 7 at a predetermined angle.
The tip ends of the cutting blade drive arms 8 and 9 having their bases fixed to 7 also reciprocate left and right at a predetermined angle.

When the tip of the cutting blade drive arm 8 rotates right by a predetermined angle, the upper blade 13 pivotally attached to the tip of the cutting blade drive arm 8 moves to the right along the cutting blade support bar 12 by a predetermined amount. The cutting blade drive arm 9 is moved by a distance, and at the same time, the tip of the cutting blade drive arm 9 is rotated leftward by a predetermined angle, and the lower blade 14 pivotally attached to the tip of the cutting blade drive arm 9 is moved leftward along the upper blade 13 by a predetermined distance. Upper blade that moves to the right as it moves a distance 13
And the lower blade 14 that moves to the left are used to mow the grass, and this operation is performed by the cutting blade drive mechanism 4 so that the upper blade 13 moves to the left.
14 moves in the opposite direction to the right and repeats this operation to mow grass such as ridges.

The operation will be described in claim 2.

The cutting blade drive mechanism 4 for converting the rotation of the drive shaft 2 into a reciprocating rotary motion at a predetermined angle is provided on the two cutting blade drive shafts 6 and 7 which are vertically arranged in parallel in the drive case 5. When the drive shaft 2 rotates, the two cutting blade drive shafts 6 and 7 held by the bearing mechanisms 6 ′ and 7 ′ reciprocally rotate at a predetermined angle. The cutting blade drive arm 8 having a base fixed to the lower part of the cutting blade drive shafts 6 and 7.
Since the tip portions of 9 also reciprocate left and right at a predetermined angle with respect to each other, the upper blade 13 and the lower blade 14 pivotally attached to the cutting blade drive arms 6 and 7 move left and right by a predetermined distance, and the machine body a is the same as described above. With the progress of, the upper blade 13 and the lower blade 14 cut grass such as ridges.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show a preferred embodiment of the present invention. FIGS. 1 to 5 show a second embodiment, and FIGS. 6 and 7 show a first embodiment.

A first embodiment of the present invention will be described.

The small engine 3 for traveling is attached to the machine body a,
A speed change gear device 22 for driving wheels 21 is provided in the small travel engine 3, and a power distribution device 23 for separating power from the small travel engine 3 is provided in front of the speed change gear device 22.
The base portion of the belt drive device 24 for offsetting the input power from the small traveling engine 3 distributed in front of the power distribution device 23 from the center of the body a to the left front side of the body a and fixing it Then, a bevel gear box in which a connecting cylinder 25 is provided so as to project forward at an offset portion at the other end of the belt driving device 24, and a pair of bevel gears 26 and 27 are internally provided at the tip end of the connecting cylinder 25.
The drive cylinder 1 is vertically provided via 28, and the drive shaft 2 is vertically provided in the drive cylinder 1. In this embodiment, the drive cylinder 1 is composed of an upper connecting cylinder 15 and a lower connecting cylinder 18 which is detachably fitted into the lower part of the upper connecting cylinder 15, and the drive shaft 2 vertically installed in the drive cylinder 1 is described above. The bevel gear 27 is composed of an upper drive shaft 29 having a base fixed to the bevel gear 27 and a connecting member 16 attached to the lower end thereof, and a connecting drive shaft 17 detachably connected to a spline or a female selection portion attached to the lower part of the connecting member 16. , The lower connecting cylinder 18 is fixed to the upper connecting cylinder 15 while the connecting drive shaft 17 is connected to the connecting tool 16.
Provided with a fixing mechanism 19 for fixing both by the link mechanism of
A drive case 5 incorporating the cutting blade drive mechanism 4 is continuously provided below the lower connection cylinder 18, and a pinion gear 30 is provided at the lower end of the connection drive shaft 17.

The cutting blade drive mechanism 4 shown in the figure holds the upper and lower ends of the crankshaft 32 by bearings 33, 33 fitted in the drive case 5, and the pinion gear 30 is attached to the shaft portion near the upper bearing 33.
The crank gear 34 that meshes with the
Two eccentric discs are attached to the crankshaft 32 between the 34 and the lower bearing 33 while maintaining a phase of 180 degrees, and the eccentric discs are connected to the connecting rods 35 and 36 of the connecting rod shape. The large end is attached to the shaft and the other end is protruded to the left, and the cutting blade drive shafts 6 and 7 held by two pairs of bearings above and below the right side in the drive case 5 are mutually attached. The base edges of the crank arms 37 and 38 are vertically attached in series vertically at a predetermined interval, and the bases of the crank arms 37 and 38 are fixed to the base ends of the cutting blade drive shafts 6 and 7, respectively. The tip of 38 is pivotally attached to the small end of the connecting rods 35 and 36, and the upper protruding shaft portion of the cutting blade drive shaft 6 is formed into a spline or selection male portion shape, and the cutting blade drive is provided on the protruding shaft portion. Arm 8
The spline or selection female part shape base is fitted and fixed, and the lower projecting end of the cutting blade drive shaft 7 is formed into the spline or selection male part shape similar to the above, and the lever-like cutting blade is formed at this projecting end. The spline of the drive arm 9 or the base of the selection female portion is fitted and fixed to form the cutting blade drive mechanism 4.

Two cutting blade holding arms 10 are provided on the lower surface of the drive case 5.
・ 11 are projected in parallel to the left and right at a predetermined interval, and the cutting blade support bars 12 are laterally installed at the tips of these two cutting blade holding arms 10 ・ 11 and fixed with countersunk bolts 39. An upper blade 13 provided with a plurality of cutting blades 46 for cutting grass forwardly on the lower side of the cutting blade support bar 12, and a plurality of cutting blades 46 on the lower surface of the upper blade 13.
The lower blade 14 and the lower blade 14 protruding from the
3, the lower blade 14 is provided with connecting projections 13 ', 14' integrally formed so as to be directed rearward, and the connecting projections 13 ', 14' and the cutting blade drive arm 8 are provided.
U provided at the lower end of the blade and the lever tip of the cutting blade drive arm 9
Movable cutting blade support bar 12, upper blade 13 and lower blade 14 which are provided in a superposed state are clipped by several cutting blade tightening bolts 41 by connecting and pivoting the character-shaped groove portions 8'and 9'with a pin shaft 40. The upper blade 13 and the upper blade 13
, The lower blades 14 are engaged and locked with each other by holding appropriate gaps so that the lower blades 14 can slide left and right, and the bolt holes of the upper blades 13 slidably locked by the cutting blade fastening bolts 41. Is extended rightward by a predetermined length to form a bolt elongated hole 13 ", and each bolt hole of the lower blade 14 is extended leftward to form a bolt elongated hole 14".

Since the first embodiment of the present invention is configured as described above, the power taken from the traveling small engine 3 is stored in the speed change gear device 22, the power distribution device 23, the belt drive device 24, and the bevel gear box 28. Is transmitted to the pinion gear 30 of the connecting drive shaft 17 in the lower connecting cylinder 18 via the upper drive shaft 29, and the crank gear 34 fixed to the crank shaft 32 meshing therewith rotates and is provided on the crank shaft 32. The large ends of the connecting rods 35 and 36 are rotated by the two eccentric discs that maintain the phase of 180 degrees and the connecting rod 35 and 36 are
Since the small end of the other end of 36 is converted into a reciprocating linear motion with a stroke equivalent to the eccentric amount of the eccentric disc, the small ends of the connecting rods 35 and 36 make a reciprocating linear motion with a predetermined stroke and move up and down. The provided cutting blade drive shafts 6 and 7 reciprocally rotate left and right while maintaining a phase of 180 degrees with each other at a predetermined angle by the link mechanism of the crank arms 37 and 38. The upper blade 13 axially attached to the cutting blade drive arm 8 fixed to the slider slides to the right along the lower side surface of the cutting blade support bar 12 using the pin shaft 40 as a guide, and at the same time, is axially attached to the cutting blade drive arm 9. Lower blade 14 is replaced by upper blade 13
Slide to the left along the lower side with the pin shaft 40 as a guide, and the cutting blade 46 of the upper blade 13 and the cutting blade 46 of the lower blade 14 cut the grass. Contrary to the above, the mechanism 4 causes the upper blade 13 to move to the left and the lower blade 14 to move to the right, repeating the reverse operation to cut grass such as ridges. A second embodiment of the present invention will be described.

In the same manner as described above, a small-sized engine 3 for traveling is attached to the machine body a, and the small-sized engine 3 is provided with a speed change gear device 22, a power distribution device 23, a belt drive device 24, a bevel gear box 28, an upper connecting cylinder 15, a lower part. A drive case 5 in which the connecting cylinder 18 and the cutting blade drive mechanism 4 are housed is provided in series. A pinion gear 30 is provided at the lower end of the coupling drive shaft 17, and a crank gear 32 meshing with the pinion gear 30 is fixed to a crank shaft 32, which is 180
Two eccentric discs are attached while maintaining the phase of the degree, and the large ends of the connecting rods 35 and 36 in the form of connecting rods are axially attached to this eccentric disc, and the small ends of the other ends are directed to the right. The cutting blade connecting shaft 42 and the cutting blade driving shaft 7, which are respectively supported by two sets of bearings above and below the right side in the drive case 5, are vertically connected in series at predetermined base edges. The crank arms 37 and 38 of the same shape are fixed to the base ends of the respective shafts, and the tips of the crank arms 37 and 38 are axially attached to the small ends of the connecting rods 35 and 36. , The base end of the lever 43 is fixed to the upper shaft end of the cutting blade connecting shaft 42, and the cutting blade connecting shaft 42 and the cutting blade driving shaft 7 are vertically arranged at a predetermined interval in the drive case 5 on the right side. The cutting blade drive shaft 6 held by the provided bearing is vertically installed in parallel with the connecting shaft 42 and the cutting blade drive shaft 7, and the lever 43 is provided at the upper end of the cutting blade drive shaft 6.
The base portion of a lever 44 of the same shape as the above is fixedly attached, and the connecting lever 45 is pivotally attached to the tip end portion of the levers 43 and 44, and the cutting blade drive shafts 6 and 7 are attached.
A protruding spline or serration male part is formed at the lower end, and a lever-shaped cutting blade drive arm 8 or 9 base at which a spline or serration female part is formed is fitted and fixed to the cutting end drive mechanism 4 Make up.

Similarly to the above, two cutting blade holding arms 10 and 11 are provided on the lower surface of the drive case 5 so as to be juxtaposed in parallel to the front at predetermined intervals, and the cutting blades are provided at the tip of the cutting blade holding arms 10 and 11. A support bar 12 is installed sideways, and an upper blade 13 and a lower blade 14 are provided under the cutting blade support bar 12 in a superposed state, and the cutting protrusions 13 'and 14' of the upper blade 13 and the lower blade 14 are mowed. The blade driving arms 8 and 9 are pivotally attached, and the cutting blade support bar 12, the upper blade 13, and the lower blade 14 are attached to the cutting blade support bar 12 with several cutting blade tightening bolts 41.
On the other hand, the upper blade 13 and the lower blade 14 are provided so as to be slidable with respect to each other with respect to the upper blade 13, and bolt elongated holes 13 "and 14" are bored in the upper blade 13 and the lower blade 14, respectively.

Since the second embodiment is constructed as described above,
The power extracted from the traveling small engine 3 is a speed change gear device.
22, power distribution device 23, belt drive device 24, bevel gear box 28,
Lower connecting cylinder 18 via upper drive shaft 29 in upper connecting cylinder 15
Is transmitted to the pinion gear 30 of the connecting drive shaft 17 and is engaged with the crank gear 34 by the crank gear 32.
The small ends of 35 and 36 reciprocate linearly with a predetermined stroke,
By this movement, the cutting blade connecting shaft 42 reciprocates left and right at a predetermined angle by the link mechanism of the crank arm 37, and the cutting blade drive shaft 6 is set by the link mechanism of the lever 43, the connecting lever 45, and the lever 44. At the same time, the cutting blade drive shaft 7 reciprocates left and right at a predetermined angle by the link mechanism of the crank arm 38 while reciprocally rotating left and right at an angle of 180 degrees with this movement. With the cutting blades 46, 46 of the blade 14, the cutting blades of the upper blade 13 and the lower blade 14 are advanced as the machine body a advances.
Mow the grass on the ground at 46 ・ 46.

The first embodiment and the second embodiment are both embodiments corresponding to claim 1, the second embodiment is also an embodiment corresponding to claim 2, and the second embodiment is cutting. The blade drive shaft 6 and the cutting blade drive shaft 7 are arranged side by side, and the cutting blade drive arm 8 is provided at each protruding lower end.
・ 9 is projected to make the drive smooth.

[0022]

As described above, according to the present invention, the power extracted from the small-sized traveling engine is converted by the cutting blade drive mechanism so that the two cutting blade drive shafts are reciprocally rotated to the left and right within a predetermined angle range. Since the cutting blade drive arm fixed to the cutting blade drive shaft slides the upper blade and the lower blade, which are provided under the cutting blade support bar in the overlapping state, to the left and right at the same time, the grass is cut. Self-propelled mower This is a self-propelled mower with much better mowing function than the type in which the lower blade is fixed and only the upper blade is driven.

Further, since both the upper blade and the lower blade move left and right in opposite directions, and the respective cutting blade drive shafts of the upper blade and the lower blade are held individually by the bearing mechanism, the left and right cutting blade holding arms arranged side by side. The reciprocating rotary motion that swings in the direction does not shake or rattle, and it performs a very stable mowing operation, at the same time there is little vibration and the cutting sharpness is extremely good. Since old grass is piled up in the place where is growing, it is possible to cut while diving into the grass that is piled up by moving the upper plate and the lower plate at the same time. It becomes a running mower.

[Brief description of drawings]

FIG. 1 is a perspective view of a second embodiment of the present invention.

FIG. 2 is a front view in which a part of the main part is cut away.

FIG. 3 is a perspective view of the main part.

FIG. 4 is a cutting blade driving arm, a cutting blade holding arm, a cutting blade support bar,
It is a top view of an upper blade and a lower blade.

FIG. 5 is a front view in which the above part is cut away.

FIG. 6 is a side sectional view in which a part of an essential part of the first embodiment of the present invention is cut away.

FIG. 7 is a perspective view of the main part.

[Explanation of symbols]

 1 Drive cylinder 2 Drive shaft 3 Small engine for traveling 4 Cutting blade drive mechanism 5 Drive case 6.7 Cutting blade drive shaft 6 '・ 7' Bearing mechanism 8.9 Cutting blade driving arm 10/11 Cutting blade holding arm 12 Cutting blade Support bar 13 Upper blade 14 Lower blade a Machine body

Claims (2)

[Claims] 1. A drive cylinder vertically installed in a front portion of a machine body, and a drive shaft vertically installed in the drive cylinder is rotatably provided by distributing power from a small engine for traveling installed in the machine body. A drive case with a cutting blade drive mechanism installed inside is attached to the lower part of this, and two cutting blade drive shafts that reciprocally rotate at a predetermined angle by the cutting blade drive mechanism are projectingly provided on this drive case. The cutting blade drive arms are projected toward the front side, and two cutting blade holding arms are projected parallel to each other at a predetermined interval in the drive case, and the cutting blade holding arms are cut at the tips of the two cutting blade holding arms. A blade support bar is installed horizontally, and an upper blade and a lower blade are reciprocally movable to the left and right below the cutting blade support bar, and the tip of the cutting blade drive arm is connected to the upper blade and the lower blade. A self-propelled mower featuring. 2. A drive case containing a cutting blade drive mechanism, in which two cutting blade drive shafts are vertically installed in parallel with each other, each cutting blade drive shaft being held by a bearing mechanism, and each lower end of the drive case. 2. The self-propelled grass cutting mechanism according to claim 1, wherein the two cutting blade drive shafts are respectively provided with projecting blade drive mechanisms that change the rotation of the drive shafts into a reciprocating rotary motion of a predetermined angle. Machine.