JPH0928149A - Reciprocating type cutting blade device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the manifestation of good cutting quality by making the backlash of a pair of upper and lower cutting blades absorbed during operations even if there is the backlash in the joining direction thereof and further prevention of the breakage of each cutting blade in the pair of upper and the lower cutting blade units with pebbles, etc. SOLUTION: This reciprocating type cutting blade device is obtained by additionally installing a comb-shaped ground contact guide unit 9, extending in the longitudinal direction of an upper cutting blade unit 5 and a lower cutting blade unit 6 having plural upwardly curved guide protrusions 9a, 9a,..., protruding longer than each trapezoidal cutting blade on both sides in the width direction in the lower part on the ground contact side and making the backlash in the joining direction between the respective trapezoidal cutting blades on the front side in the operating directions of the upper cutting blade unit 5 and the lower cutting blade unit 6 by an upward ground contact reactional force acting on the respective guide protrusions 9a, 9a,... on the front side in the operating direction of the ground contact guide unit 9 absorbed during the operations in the reciprocating type cutting blade device equipped with the upper cutting blade unit 5 and the lower cutting blade unit 6, having plural trapezoidal cutting blades formed on both sides in the width direction and nipped between a cutter guide 7 and a cutter presser 8 so as to enable the free reciprocating and sliding in the longitudinal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating type mowing device equipped in, for example, a mowing machine, and more specifically, it can provide good sharpness even if a pair of upper and lower cutting blades have play in the joining direction. Reciprocating mowing device.

[0002]

2. Description of the Related Art For example, as a reciprocating type cutting blade device mounted on a mower, a device shown in FIG. 6 has been generally known. Here, in FIG. 6, reference characters a and b denote a pair of upper and lower elongated guide plates whose base ends are fixed to the mission case c of the mower by bolts and nuts d, which are arranged along the longitudinal direction thereof. They are connected to each other by a plurality of sets of bolts and nuts e, and are opposed to each other with a predetermined space provided by a spacer ring (not shown) fitted to each bolt. Further, between the pair of upper and lower guide plates a and b, there is a pair of upper and lower cutting blades, that is, upper cutting blades, each having a long hole (not shown) fitted into and guided by the spacer ring. f and the lower cutting blade body g are sandwiched so as to be slidable back and forth along the longitudinal direction.

Here, the base end portions of the upper cutting blade body f and the lower cutting blade body g are respectively configured to transmit to a crank mechanism (not shown) facing the transmission case c, and the crank mechanism is not shown. The upper cutting blade body f and the lower cutting blade body g are reciprocally driven in opposite directions along the longitudinal direction by being rotationally driven by the engine via the above-mentioned clutch device, and thus the grass cutting operation is performed. ing.

In such a mowing operation using a pair of upper and lower cutting blades, looseness in the joining direction of the upper cutting blade f and the lower cutting blade g greatly affects the sharpness, and the looseness is within an appropriate range. In that case, good sharpness is exhibited and the work efficiency is increased, but if the backlash is too large, the sharpness is deteriorated and the work efficiency is extremely lowered. Therefore, the upper cutting blade body f and the lower cutting blade body g are adjusted in advance so that the play in the joining direction is within an appropriate range.

[0005]

By the way, the upper cutting blade body f and the lower cutting blade body g whose backlash in the joining direction is adjusted in advance within an appropriate range are also worn by the reciprocal sliding. In some cases, a plurality of sets of bolts that connect a pair of upper and lower guide plates a and b that sandwich these
If the nut e is loosened, looseness in the joining direction becomes large and the sharpness deteriorates.

When the play in the joining direction of the pair of upper and lower guide plates a and b becomes large and the sharpness deteriorates, the play may be readjusted within an appropriate range. It is difficult to perform the adjustment work at any time on the mowing work site, which causes problems such as continuing work with poor sharpness, interrupting work, or continuing work with another mowing machine. It was happening.

Therefore, according to the present invention, even if a pair of upper and lower cutting blades have backlash in the joining direction, the backlash can be absorbed during work and a good sharpness can be exhibited. An object of the present invention is to provide a reciprocating type cutting blade device capable of preventing each cutting blade of the cutting blade body from being damaged by pebbles or the like.

[0008]

As means for achieving this object, the present invention provides a pair of upper and lower cutting blades having a plurality of cutting blades formed on both sides in the width direction between a cutter guide and a cutter retainer. In a reciprocating type cutting blade device that is reciprocally slidably clamped along a direction, the cutting blade extends along the longitudinal direction of the pair of cutting blade bodies, and protrudes longer than each cutting blade on both sides in the width direction and is curved upward. It is characterized in that a comb-shaped ground guide body having a plurality of guide protrusions is additionally provided on the lower part on the ground side.

Further, according to the present invention, a pair of upper and lower cutting blades having a plurality of cutting blades formed on one side in the width direction are sandwiched between the cutter guide and the cutter retainer so as to be reciprocally slidable along the longitudinal direction. In the reciprocating blade device, the comb-shaped ground guide body extends along the longitudinal direction of the pair of blades, and has a plurality of guide protrusions on one side in the width direction that project longer than the blades and curve upward. Is attached to the lower part of the ground side.

[0010]

The reciprocating type cutting blade device of the present invention which employs such means is used, for example, in a mowing work by equipping a mowing machine and reciprocally driving a pair of upper and lower cutting blades in opposite directions. To be done. Here, in the grass cutting operation, the grounding guide body is grounded following the curvature of each guide projection so that the pair of upper and lower cutting blade bodies has an inclined posture with the front side in the working direction slightly lowered. Then, during the mowing work, an upward ground reaction force acts on each guide protrusion on the front side in the working direction of the grounding guide body, and this grounding reaction force joins the cutting blades on the front side in the working direction of the pair of upper and lower cutting blade bodies. Since the rattling in the direction is absorbed, the cutting blades are joined in close contact with each other to exhibit good sharpness.

During such a mowing operation, since the guide projections of the grounding guide body face immediately before and below the cutting blades on the front side in the working direction of the pair of upper and lower cutting blade bodies, pebbles and the like are cut off. The blades do not hit the blades directly, preventing damage to each blade.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 2 showing the overall structure of the mowing machine, reference numeral 1 is a reciprocating cutting blade device forming the main body, reference numeral 2 is a mission case incorporating a drive system of the reciprocating cutting blade device 1, reference numeral 3 is on the mission case 2. A two-cycle engine connected to the transmission case, reference numeral 4 denotes an operation handle attached to the mission case 2.

As shown in FIG. 3, the reciprocating type cutting blade device 1 has an upper cutting blade body in which a plurality of trapezoidal cutting blades 5a, 5a ,. 5, except for the lower cutting blade body 6 in which a plurality of trapezoidal cutting blades 6a, 6a, ... Are continuously formed on both sides along the longitudinal direction at a predetermined pitch, and the trapezoidal cutting blade 5a of the upper cutting blade body 5 A slender flat plate-shaped cutter guide 7 that can be attached to the central portion,
Similarly, the lower cutting blade body 6 is mainly composed of an elongated flat plate-like cutter retainer 8 that can be attached to the central portion of the lower cutting blade body 6 excluding the trapezoidal cutting blade 6a. In the present invention, a grounding guide body 9 is newly added. It

The grounding guide body 9 has a plurality of triangular guide projections 9a, 9a, ...
Is a long and slender comb-like shape continuously formed at a predetermined pitch, and the width of the central portion excluding the guide protrusions 9a, 9a, ... Is approximately equal to the cutter guide 7 or the cutter retainer 8, and the guide protrusions 9a, 9a The total width including, ... Is wider than the total width of the upper cutting blade body 5 or the lower cutting blade body 6. That is, each of the guide protrusions 9a, 9a, ... Projects longer than the trapezoidal cutting blade 5a of the upper cutting blade body 5 or the trapezoidal cutting blade 6a of the lower cutting blade body 6. The total length of the grounding guide body 9 is slightly shorter than that of the cutter guide 7 or the cutter retainer 8.

Further, the upper cutting blade body 5 and the lower cutting blade body 6 have a plurality of guide holes 5b, 5b, ... 6b, ... Are formed at a predetermined pitch, and in the cutter guide 7, cutter retainer 8 and ground guide body 9, bolt insertion holes 7a, 7a, ..., 8a, 8a, corresponding to the guide holes 5b, 6b are formed. … And 9b, 9
b, ... Are respectively located at the center portion in the width direction and are formed at a predetermined pitch.

Here, as shown in FIG. 1, the grounding guide body 9 has a warp-shaped cross-sectional shape as a whole by the guide projections 9a, 9a on both sides in the width direction being curved upward, and the lower surface thereof. A bolt accommodating groove 9c is formed at the central portion in the width direction and extends along the longitudinal direction. Such a grounding guide body 9 is joined to the lower surface of the cutter retainer 8 located at the lower part by joining the cutter guide 7, the upper cutting blade body 5, the lower cutting blade body 6 and the cutter retainer 8 in this order from above. The bolt insertion holes 9b,
Each nut 11 is screwed to the tip of each cutter bolt 10 in which the head 10a is accommodated in the bolt accommodating groove 9c by being sequentially inserted through the bolt insertion hole 8a, the guide hole 6b, the guide hole 5b, and the bolt insertion hole 7a. Thus, the reciprocating cutting blade device in which the upper cutting blade body 5 and the lower cutting blade body 6 sandwiched between the cutter guide 7 and the cutter retainer 8 are reciprocally slidable in the longitudinal direction within the range of the guide holes 5b, 6b. 1 is assembled.

As shown in FIG. 3, the reciprocating type cutting blade device 1 has a structure in which the cutter guide 7 is detachably connected to a mission case 2 of a mower.
Is provided with a connecting portion 7b that is bent slightly upward and extends in parallel to the base end portion of the blade, and is integrally formed with the base end portion of the upper cutting blade body 5 and projects from the cutter guide 7 and the cutter retainer 8 to one side in the width direction. A connecting piece 12 fixed to the upper surface of the connecting portion 5c by a screw, and a connecting portion 6c which is integrally formed at the base end portion of the lower cutting blade body 6 and projects from the cutter guide 7 and the cutter retainer 8 to the other side in the width direction. And a connection piece 13 that is fixed by screwing to the lower surface of the.

On the other hand, the transmission case 2 of the mowing machine to which the reciprocating type cutting blade device 1 is mounted has a crank mechanism 14 and the like which is rotationally driven by a two-cycle engine 3 via a clutch device. Mechanism 14
The outer ends of the upper drive member 15 and the lower drive member 16, which have inner ends respectively configured to transmit power and are reciprocally driven in mutually opposite directions, extend outward from the mission case 2.

Here, a connecting portion 15a is integrally formed at the outer end portion of the upper driving member 15 so as to project to one side in the width direction thereof and to be joined to the lower surface of the connecting piece 12 fixed to the upper cutting blade body 5. Similarly, the outer end of the lower drive member 16 is integrally formed with a connecting portion 16a that projects to the other side in the width direction and is joined to the upper surface of the connecting piece 13 fixed to the lower cutting blade body 6. Also, these upper drive member 15 and lower drive member 16
, A connecting piece 17 joined to the lower surface of the connecting portion 7b of the cutter guide 7 is projectingly provided on the mission case 2 by bolt and nut coupling.

Therefore, the connecting piece 12 on the upper cutting blade body 5 side is connected to the connecting portion 15a of the upper drive member 15 via the bracket 18 with the nut and the connecting bolt 19, and similarly the connecting piece on the lower cutting blade body 6 side is connected. 13 is a connecting portion 1 of the lower drive member 16
6a includes bracket 18 with nut and connecting bolt 19
And the connecting portion 7 of the cutter guide 7
By fixing b to the connecting piece 17 by screwing, the base end portions of the upper cutting blade body 5 and the lower cutting blade body 6 are connected to the distal end portions of the upper driving member 15 and the lower driving member 16, respectively, and the cutter guide 7 The base end portion is cantileveredly connected to the mission case 2 via the connecting piece 17, and thus the reciprocating cutting blade device 1 is detachably attached to the mission case 2.

Next, the operation of the reciprocating type cutting blade device 1 mounted on the mission case 2 of the mower in this way will be described. When the two-cycle engine 3 of the mowing machine is started during the mowing work, the crank mechanism 14 in the mission case 2 reciprocally drives the upper driving member 15 and the lower driving member 16 in opposite directions, and the reciprocating machine connected to them is driven. The upper cutting blade body 5 and the lower cutting blade body 6 of the cutting blade device 1 are the cutter guide 7 and the cutter retainer 8.
They are reciprocally driven in mutually opposite directions while being sandwiched by.

Therefore, as shown in FIG. 4, the worker carries out the grass cutting work by the reciprocating type cutting blade device 1 which is substantially orthogonal to the traveling direction while walking backward with the operation handle 4.
At that time, the operator grounds the grounding guide body 9 of the reciprocating cutting blade device 1 following the curvature of the guide projections 9a, 9a, ..., and the upper cutting blade body 5 and the lower cutting blade body 6 work in a horizontal state. The operation handle 4 is operated so that the front side in the direction takes a slightly lower inclination (inclination of about 3 °) (see FIG. 5).

When the upper cutting blade body 5 and the lower cutting blade body 6 are inclined in the posture in which the front side in the working direction is low and inclined in this manner, the guide protrusions 9a, 9a, ... Since an upward ground reaction force F acts on this, by continuing the grass cutting work against this ground reaction force F, each trapezoid cutting at the front side in the working direction of the upper cutting blade body 5 and the lower cutting blade body 6 is performed. The blades 5a and the trapezoidal cutting blades 6a absorb any backlash in the joining direction, so that the trapezoidal cutting blades 5a and the trapezoidal cutting blades 6a are joined in close contact with each other to exhibit good sharpness.

When foreign matter such as pebbles S exists in the front in the working direction during such a mowing operation, each trapezoidal cutting blade 5 on the front side in the working direction.
a and the guide protrusions 9a, 9 of the grounding guide body 9 located immediately below the trapezoidal cutting blade 6a and projecting to the front thereof.
.. eliminate foreign matter such as pebbles S, and prevent trapezoidal cutting blade 5a and trapezoidal cutting blade 6a from being damaged by foreign matter such as pebbles S.

In the above embodiment, the upper cutting blade body 5
Both the lower cutting blade body 6 and the lower cutting blade body 6 have a plurality of trapezoidal cutting blades 5a and trapezoidal cutting blades 6a, but one of them may have a triangular cutting blade, or both may have triangular cutting blades. Good. The shape and number of cutting blades themselves are not particularly limited and can be arbitrarily selected.

The upper cutting blade body 5 and the lower cutting blade body 6 may have a trapezoidal cutting blade 5a and a trapezoidal cutting blade 6a only on one side in the width direction thereof. In this case, the ground guide body 9 is provided.
The guide protrusions 9a, 9a, ... Should be formed only on one side in the width direction of the ground guide body 9 corresponding to the trapezoidal cutting blade 5a and the trapezoidal cutting blade 6a.

The material of the ground guide body 9 can be arbitrarily selected as long as it has structurally sufficient strength. For example, structural synthetic resin can be adopted in consideration of reducing grounding resistance during mowing work and considering moldability.

[0028]

As described above, according to the present invention, the grounding guide body is grounded by following the curvature of each guide projection so that the pair of upper and lower cutting blades have an inclined posture in which the front side in the working direction is slightly lowered. When doing so, an upward ground reaction force acts on each guide protrusion on the front side in the working direction of the grounding guide body, and this grounding reaction force joins between the cutting blades on the front side in the working direction of the pair of upper and lower cutting blade bodies. The play in the direction is absorbed.
For this reason, the respective cutting blades can be bonded to each other in close contact with each other to exhibit good sharpness, and the working efficiency can be improved.

During such an operation, since the guide protrusions of the grounding guide body face immediately below the cutting blades on the front side in the working direction of the pair of upper and lower cutting blade bodies, pebbles and the like are used to cut each cutting blade. It is possible to prevent damage to each cutting blade before it directly hits the cutting blade.

[Brief description of drawings]

FIG. 1 is a front view showing an assembled state of a reciprocating cutting blade device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the overall structure of a grass mower equipped with the reciprocating cutting blade device of one embodiment.

FIG. 3 is an exploded perspective view showing the structure of a reciprocating cutting blade device according to an embodiment.

FIG. 4 is a perspective view showing a usage state of a mowing machine equipped with the reciprocating type cutting blade device according to the embodiment.

FIG. 5 is a front view showing the operation of the reciprocating cutting blade device according to the embodiment.

FIG. 6 is a perspective view showing an entire structure of a conventional reciprocating type cutting blade device.

[Explanation of symbols]

 1 Reciprocating Cutting Blade Device 2 Mission Case 3 2 Cycle Engine 4 Operation Handle 5 Upper Cutting Blade 5a Trapezoid Cutting Blade 5b Guide Hole 5c Connection 6 Lower Cutting Blade 6a Trapezoid Cutting Blade 6b Guide Hole 6c Connection 7 Cutter Guide 7a Bolt insertion hole 7b Connection part 8 Cutter presser 8a Bolt insertion hole 9 Grounding guide body 9a Guide protrusion 9b Bolt insertion hole 9c Bolt receiving groove 10 Cutter bolt 10a Head 11 Nut 12 Connection piece 13 Connection piece 14 Crank mechanism 15 Upper drive member 15a Connection part 16 Lower drive member 16a Connection part 17 Connection piece 18 Bracket with nut 19 Connection bolt

Claims (2)

[Claims] 1. A reciprocating type in which a pair of upper and lower cutting blades having a plurality of cutting blades formed on both sides in the width direction are reciprocally slidable in the longitudinal direction between a cutter guide and a cutter retainer. In the cutting blade device, a comb-shaped grounding guide body extending along the longitudinal direction of the pair of cutting blade bodies and having a plurality of guide projections that project longer than the respective cutting blades and curve upward on both sides in the width direction is provided on the grounding side. Reciprocating cutting blade device that is attached to the bottom of the. 2. A reciprocating type in which a pair of upper and lower cutting blades having a plurality of cutting blades formed on one side in the width direction are reciprocally slidable in the longitudinal direction between a cutter guide and a cutter retainer. In the cutting blade device, a comb-shaped grounding guide body extending along the longitudinal direction of the pair of cutting blade bodies and having a plurality of guide projections protruding upward from each of the cutting blades on one side in the width direction and curved upward is provided on the grounding side. Reciprocating cutting blade device that is attached to the bottom of the.