JP3553148B2 - Removal structure of clipper-type cutting blade - Google Patents

Description

[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clipper-type cutting blade that constitutes a main part of a mower, a pruning machine, and the like. More specifically, an improved clipper-type cutting blade that can be easily removed and assembled with one touch. And a detachable structure.
[0002]
[Prior art]
For example, a clipper-type cutting blade shown in FIG. 10 is generally known as a clipper-type cutting blade provided in a mower. Here, in FIG. 10, reference numerals a and b denote a pair of upper and lower elongated guide plates whose base ends are fixed to the transmission case c of the mower by bolts and nuts d, which are arranged along the longitudinal direction thereof. Are connected to each other by a plurality of sets of bolts and nuts e, and are opposed to each other at a predetermined interval by a spacer ring (not shown) fitted to each bolt. A pair of upper and lower clipper-type cutting blades, each having a long hole (not shown) fitted into each of the spacer rings and guided by the spacer ring, between the pair of upper and lower guide plates a and b. The cutting blade f and the lower cutting blade g are slidably held in the longitudinal direction.
[0003]
Here, the base ends of the upper cutting blade body f and the lower cutting blade body g are each configured to transmit to a crank mechanism not shown facing the inside of the transmission case c. The upper cutting blade f and the lower cutting blade g are reciprocally driven in opposite directions along the longitudinal direction by being rotationally driven by the engine via the engine, thereby performing mowing work.
[0004]
In the mowing operation using such a clipper-type cutting blade, the polishing state of each cutting blade of the upper cutting blade f and the lower cutting blade g has a great effect on sharpness, and the sharpness is good in the sharp polishing state. However, if the cutting blades wear out as the mowing work progresses, the sharpness deteriorates and the working efficiency drops extremely. Therefore, when the sharpness deteriorates or after mowing the grass for a certain period of time, it is necessary to regrind the worn blades of the worn upper blade f and lower blade g.
[0005]
Here, the re-polishing operation of the upper blade f and the lower blade g can be performed while these blades are mounted on the transmission case c. In practice, the polishing operation is extremely difficult, and it takes a long time. In addition, a sufficiently satisfactory polishing state cannot be obtained. Therefore, generally, the worn upper cutting blade f and lower cutting blade g are removed from the transmission case c and the pair of upper and lower guide plates a and b, and the respective cutting blades are individually polished again.
[0006]
[Problems to be solved by the invention]
By the way, when removing the upper and lower blades f and g from the transmission case c and the pair of guide plates a and b, respectively, the pair of guide plates a and b must be moved up and down. It is necessary to disassemble the transmission case c by removing a plurality of sets of bolts and nuts e connected together and removing the bolts and nuts d fixing the base ends thereof to the transmission case c. There is a problem that it is extremely troublesome and cannot be easily removed at the site of mowing work. Similarly, in order to assemble the upper cutting blade body f and the lower cutting blade body g after the re-grinding operation, the transmission case c and the pair of guide plates a and b also require the operation in the opposite procedure to the above-described operation. The work of connecting the guide plate with a plurality of sets of bolts and nuts e requires a delicate adjustment of the spacing, which is extremely troublesome to assemble and cannot be easily assembled at the mowing site. Was.
[0007]
Therefore, in the conventional example, even if the sharpness deteriorates during the mowing operation, the clipper-type cutting blade cannot be easily replaced, and the operation is continued or the operation is interrupted while the operation efficiency is extremely reduced. Or the need to continue working with another mower.
[0008]
Therefore, the present invention enables the work of removing and assembling the pair of upper and lower clipper-type cutting blades to be performed easily and quickly without disassembling the transmission case and the pair of guide plates. An object of the present invention is to provide a clipper-type cutting blade attachment / detachment structure capable of exchanging the blade.
[0009]
[Means for Solving the Problems]
For this purpose, the detachable structure of the clipper-type cutting blade body according to the present invention is connected at a predetermined interval to each other via a plurality of connecting members arranged along the longitudinal direction, and the base end is connected to the transmission case. A fixed pair of upper and lower guide plates, and a plurality of guide holes through which each of the connecting members penetrates and is guided by the pair of upper and lower guide plates. And a pair of upper and lower clippers-type cutting blades, each of which has a connecting portion formed at each base end projecting from the pair of guide plates to the left and right sides in the width direction in plan view, and each inner end is inside the transmission case. are respectively transmission configuration of the drive mechanism, the pair of clippers type cutting by the connection portions formed on the outer end portion is detachably screwed to each connection of each clipper formula cutting blade body Move the blades in opposite directions A pair of upper and lower driving members for driving, each clipper-type cutting blade body is provided with a group of notches through which each of the connecting members can pass continuously through each of the guide holes, and the group of notches The upper and lower pair of clipper-type cutting blades are configured to be detachable left and right in the width direction with respect to the pair of upper and lower guide plates by opening the opening at the side edge opposite to each connection portion of each clipper-type cutting blade. That means.
[0010]
[Action]
In the detachable structure of the clipper-type cutting blade body according to the present invention that employs such means, when a pair of upper and lower clipper-type cutting blade bodies are assembled, each clipper-type cutting blade body has left and right connection portions at its base end. To the outside in the direction, align each notch with each connecting member, insert between the pair of upper and lower guide plates from both left and right sides, and connect each connecting member to this through each notch. Fit into the guide hole. Then, the respective connecting portions at the base end of each clipper-type cutting blade are screwed and fixed to the respective outer ends of the pair of upper and lower driving members, respectively, and the assembling work of the pair of upper and lower clipper-type cutting blades is completed.
[0011]
On the other hand, when removing the pair of upper and lower clipper-type cutting blades, the work may be performed in a procedure opposite to the assembling work, and first, each connection portion of the base end of each clipper-type cutting blade and the pair of upper and lower driving members. releasing the screwed state between the outer end, each clipper type cutting blade of the pair in alignment with respective notches on the connecting member is from the guide plates withdraw the left and right, thus a pair of upper and lower Removal of the clipper-type cutting blade is completed.
[0012]
【Example】
Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
For example, in FIGS. 1 and 2 which disassemble the entire structure of one embodiment applied to a mower, a reference numeral 1 denotes a pair of upper and lower guide plates composed of an upper guide plate 1a and a lower guide plate 1b. , 3 denote an upper cutting blade and a lower cutting blade constituting a pair of upper and lower clipper-type cutting blades, and reference numeral 4 denotes a transmission case.
[0013]
The upper guide plate 1a and the lower guide plate 1b constituting the pair of upper and lower guide plates 1 are elongated flat plates, and a plurality of locations (six locations in the present embodiment) in the longitudinal direction are connecting members 5, 5,. And are opposed to each other with a predetermined space therebetween (see FIG. 3). FIG. 4 shows one of the connecting members 5 in an enlarged manner. The connecting bolt 5a penetrates the lower guide plate 1b and the upper guide plate 1a upward from the lower side, and the connecting bolt 5 on the upper surface side of the upper guide plate 1a. A connection nut 5b screwed into the connection nut 5a and a spacer ring 5c fitted between the connection bolt 5a and disposed between the upper guide plate 1a and the lower guide plate 1b are provided. The connecting bolt 5a may be a stepped bolt that also serves as the spacer ring 5c.
[0014]
As described above, the pair of guide plates 1 vertically connected to each other with a predetermined space therebetween is fixed to the support member 6 connected to the transmission case 4 by bolts and nuts. As a result, the transmission case 4 is connected and supported in a cantilever state.
[0015]
Here, the transmission case 4 has a built-in crank mechanism that is rotationally driven by a mowing machine engine (not shown) via a clutch device. The crank mechanism includes a pair of upper and lower drive members 7, that is, an upper drive member 7a. The inner end portions of the lower drive member 7b and the lower drive member 7b are each configured to transmit power, and are reciprocally driven in mutually opposite directions.
[0016]
Outer ends of the upper drive member 7a and the lower drive member 7b protruding from the transmission case 4 are slidably held between the upper guide plate 1a and the lower guide plate 1b, as shown in FIG. ing. At the outer end of the upper drive member 7a, there is integrally formed a connecting portion 7c projecting leftward in the width direction (upper side in FIG. 1) when the upper guide plate 1a is viewed from the base end side. Is formed with a bolt insertion hole 7d. Similarly, at the outer end of the lower drive member 7b, a connection portion 7e that projects rightward in the width direction of the upper guide plate 1a (the lower side in FIG. 1) when viewed from the base end side is integrally formed. A bolt insertion hole 7f is formed in the portion 7e.
[0017]
On the other hand, the upper cutting blade body 2 and the lower cutting blade body 3 are vertically overlapped and sandwiched between the upper guide plate 1a and the lower guide plate 1b so as to be reciprocally slidable. As shown in the figure, a large number of triangular cutting blades 2a projecting from the left and right sides of the pair of guide plates 1 are formed on the left and right sides of the upper cutting blade body 2 at a predetermined pitch. A large number of trapezoidal cutting blades 3a projecting from the left and right sides of the pair of guide plates 1 are formed at a predetermined pitch. Each of the upper cutting blade body 2 and the lower cutting blade body 3 is fitted with each of the spacer rings 5c of each of the connecting members 5 to be guided by the spacer rings 5c. , 3b, 3b, ... are formed along the longitudinal direction, respectively.
[0018]
Here, at the base end of the upper cutting blade 2, the upper guide plate 1 a is sandwiched between a pair of upper and lower guide plates 1, and the left side in the width direction when viewed from the base end side (upper side in FIG. 1). A connection piece 2c that can be joined to the upper surface of the connection part 7c of the upper drive member 7a is fixed to the upper surface of the connection part 2c by bolts and nuts. Is formed with a bolt insertion hole 8a corresponding to the bolt insertion hole 7d of the connection portion 7c. Similarly, at the base end of the lower cutting blade body 3, the upper guide plate 1a is sandwiched between a pair of upper and lower guide plates 1 and, as viewed from the base end side, on the right side in the width direction (the lower side in FIG. 1). ) Is integrally formed, and a connecting piece 9 that can be joined to a lower surface of the connecting portion 7e of the lower drive member 7b is fixed to a lower surface of the connecting portion 3c with a bolt and a nut. 9 has a bolt insertion hole 9a corresponding to the bolt insertion hole 7f of the connection portion 7e.
[0019]
The connecting piece 8 fixed to the connecting portion 2c of the upper cutting blade body 2 is connected to the connecting portion 7c of the upper driving member 7a by a bracket 10 with a nut so as to overlap with the connecting portion 3c of the lower cutting blade body 3. The connecting piece 9 fixed to the lower part is also connected to the connecting part 7e of the lower driving member 7b by a bracket 10 with a nut. As shown in FIG. 6, the nut-attached bracket 10 is formed by welding and fixing a nut 10b to one surface of a bracket body 10a having a U-shaped cross section, and a bolt insertion hole 10c corresponding to the nut 10b is formed in the bracket body 10a. Is formed.
[0020]
Here, the upper cutting blade body 2 has six notches 2d, 2d which are opened at the side edges opposite to the protruding side of the connecting portion 2c and through which the spacer rings 5c of the connecting members 5 can pass. , Are formed continuously at the base end of each of the guide holes 2b, 2b,..., And similarly, on the lower cutting blade body 3, on the side edge opposite to the protruding side of the connecting portion 3c. Six notches 3d, 3d,... That can be opened and through which the respective spacer rings 5c can pass are formed continuously at the base end of each of the guide holes 3b, 3b,. 1, see FIG. 2).
[0021]
Next, the operation of the thus configured embodiment will be described.
First, in order to assemble a pair of upper and lower clipper-type cutting blades each including the upper cutting blade 2 and the lower cutting blade 3, as shown in FIG. 7, the upper guide plate 1a of the pair of guide plates 1 is attached to the base end side. When viewed from above, the upper cutting blade body 2 is arranged in parallel on the left side in the width direction such that the connection portion 2c (connection piece 8) faces outward, and the lower cutting blade body 3 is connected to the connection portion 3c (connection piece 9) symmetrically to the left and right. ) Are arranged in parallel on the right side in the width direction of the upper guide plate 1a so that the upper side faces outward. Each of the notches 2d, 2d,... Of the upper cutting blade 2 and each of the notches of the lower cutting blade 3 are provided for the spacer rings 5c of the connecting members 5 connecting the pair of upper and lower guide plates 1. .. Are aligned with each other, and the upper blade 2 and the lower blade 3 are inserted between the upper guide plate 1a and the lower guide plate 1b in the direction of the arrow from both left and right sides.
[0022]
By doing so, each spacer ring 5c fits into each guide hole 2b, 2b,... Through each notch 2d, 2d,. Fit into the guide holes 3b, 3b,... Through the notches 3d, 3d,.
[0023]
Therefore, as shown in FIG. 8, the connecting piece 8 fixed to the connecting portion 2c of the upper cutting blade body 2 is superimposed on the upper surface of the connecting portion 7c of the upper driving member 7a, and both are connected to the bracket body 10a of the bracket 10 with nuts. The connection bolts, not shown, are sequentially inserted from above into the bolt insertion holes 10c of the bracket 10 with nuts, the bolt insertion holes 8a of the connecting pieces 8, and the bolt insertion holes 7d of the connection portions 7c. The connection piece 8 on the upper cutting blade body 2 side is connected to the connection portion 7c on the upper drive member 7a side by screwing into the nut 10b. In this connection state, the bracket with nut 10 can be reliably connected because the bracket body 10a does not inadvertently rotate due to engagement with the connection piece 8 and the connection portion 7c.
[0024]
When the connection piece 9 on the lower cutting blade body 3 side is connected to the connection part 7e on the lower drive member 7b side, the same operation as described above is performed. The connection piece 9 is overlapped on the lower surface of the connection part 7e, and both are attached with nuts. Holding bolts held by the bracket main body 10a of the bracket 10 and inserting connection bolts, not shown, sequentially from above into the bolt insertion holes 10c of the bracket 10 with nuts, the bolt insertion holes 7f of the connection portions 7e, and the bolt insertion holes 9a of the connection pieces 9 from above. Screw into the nut 10b of the bracket 10 with nut. By doing so, the bracket 10 with the nut securely connects the connection piece 9 to the connection part 7e without the bracket body 10a engaging with the connection piece 9 and the connection part 7e and inadvertently rotating. The work of assembling the cutting blade body 2 and the lower cutting blade body 3 is completed.
[0025]
Therefore, when the engine of the mower (not shown) is started and the clutch device is connected and operated, the upper drive member 7a and the lower drive member 7b are reciprocally driven in mutually opposite directions by the crank mechanism in the transmission case 4, and are connected to these. The upper cutting blade body 2 and the lower cutting blade body 3 are sandwiched between a pair of upper and lower guide plates 1, and each of the spacer rings 5c of each of the connecting members 5 has a guide hole 2b, 2b,. By being guided, 3b,... Are reciprocally driven in mutually opposite directions, and thus mowing work is performed.
[0026]
At this time, the connection pieces 8 on the upper cutting blade body 2 side and the connection portions 7c on the upper drive member 7a side are securely connected by the brackets 10 with nuts that do not inadvertently rotate as described above, Further, since the connection piece 9 on the lower cutting blade body 3 side and the connection portion 7e on the lower drive member 7b side are securely connected, a safe mowing operation can be performed.
[0027]
On the other hand, the triangular cutting blades 2a or the trapezoidal cutting blades 3a of the upper cutting blade body 2 and the lower cutting blade body 3 are worn out by such mowing work, and the sharpness is deteriorated, and the upper cutting blade body 2 and the lower cutting blade body 3 are cut. In order to remove 3, the work may be performed in the reverse order of the above-described assembling work. First, the connection bolts (not shown) screwed to the nuts 10 b of the brackets 10 with nuts are removed. Subsequently, for example, the connecting pieces 8 and 9 at the base ends of the upper cutting blade body 2 and the lower cutting blade body 3 are pinched, and the upper cutting blade body 2 and the lower cutting blade body 3 are longitudinally moved with respect to the pair of upper and lower guide plates 1. . And the notches 3d, 3d,... And the notches 3d, 3d,. Then, in this state, the upper blade 2 and the lower blade 3 are pulled out from between the upper guide plate 1a and the lower guide plate 1b to the left and right, and thus the upper blade 2 and the lower blade 3 are removed. Work is completed.
[0028]
In the present embodiment, the upper cutting blade 2 has a structure having many triangular cutting blades 2a, and the lower cutting blade 3 has a structure having many trapezoidal cutting blades 3a. It is good also as a structure which has many trapezoidal cutting blades and the lower cutting blade body 3 has many triangular cutting blades. Further, both the upper cutting blade body 2 and the lower cutting blade body 3 may have a structure having a large number of trapezoidal cutting blades, or conversely, each may have a structure having a large number of triangular cutting blades. In particular, the shape and number of the cutting blades are not particularly limited, and can be arbitrarily selected.
[0029]
The notches 2d, 2d,... And the notches 3d, 3d,... Formed on the upper cutting blade body 2 and the lower cutting blade body 3 have a pair of upper and lower guide plates 1 with each other. The guide holes 2b, 2b,... And the guide holes 3b, 3b,. The invention is not limited thereto, and may be continuous with the other end or the center.
[0030]
【The invention's effect】
As described above, in the present invention, the assembling work of the pair of upper and lower clipper-type cutting blades is performed by setting each of the clipper-type cutting blades to a state in which each connection portion at the base end faces outward in the left-right direction, and attaches to each connecting member. Each notch is aligned and inserted between the pair of upper and lower guide plates from both left and right sides, and each connecting member is fitted into each guide hole connected thereto through each notch, and each clipper-type cutting is performed. It is completed only by screwing and fixing each connection portion of each base end portion of the blade body to each connection portion of each outer end portion of the pair of upper and lower drive members, and the removal work of each clipper-type cutting blade body is performed by an assembly. It is completed by the procedure opposite to the attaching work.
[0031]
Therefore, according to the present invention, the removal work and the assembling work of the pair of upper and lower clipper-type cutting blades can be performed with each connection portion of each clipper-type cutting blade without disassembling the transmission case and the pair of guide plates. By simply screwing the upper and lower drive members to each connection part, it can be performed easily and quickly, and the clipper-type cutting blade can be quickly replaced at the work site, greatly improving work efficiency. be able to.
[Brief description of the drawings]
FIG. 1 is an exploded plan view showing the entire structure of an embodiment of the present invention.
FIG. 2 is an exploded bottom view showing the entire structure of one embodiment.
FIG. 3 is a side view of a pair of upper and lower guide plates in one embodiment.
FIG. 4 is a partially enlarged view of the vicinity of a connecting member according to one embodiment.
FIG. 5 is a partially enlarged view of the vicinity of a base end of a pair of upper and lower guide plates in one embodiment.
FIG. 6 is an enlarged perspective view of a bracket with a nut in one embodiment.
FIG. 7 is an overall plan view of the first stage of the assembling operation or the last stage of the removing operation, showing the operation of the embodiment.
FIG. 8 is a partially enlarged plan view near the base end of the guide plate at the end of the assembling operation or at the initial stage of the removing operation, showing the operation of the embodiment.
FIG. 9 is an overall plan view showing the operation of the embodiment at the time of completion of the assembling operation.
FIG. 10 is a perspective view showing the entire structure of a conventional example.
[Explanation of symbols]
Reference Signs List 1 upper / lower pair of guide plates 1a upper guide plate 1b lower guide plate 2 upper cutting blade 2a triangular cutting blade 2b guide hole 2c connecting portion 2d notch portion 3 lower cutting blade 3a trapezoidal cutting blade 3b guide hole 3c connecting portion 3d cutting Notch 4 Transmission case 5 Connection member 5a Connection bolt 5b Connection nut 5c Spacer ring 6 Support member 7 A pair of upper and lower drive members 7a Upper drive member 7b Lower drive members 7c, 7e Connection parts 7d, 7f Bolt insertion hole 8 Connection piece 8a Bolt Insertion hole 9 Connection piece 9a Bolt insertion hole 10 Bracket with nut 10a Bracket body 10b Nut 10c Bolt insertion hole

Claims (1)

A pair of upper and lower guide plates, which are connected at a predetermined interval to each other through a plurality of connecting members arranged along the longitudinal direction, and whose base ends are fixed to the transmission case,
Thing is sandwiched above pair of upper and lower guide plates having a plurality of guide holes each connecting member is guided thereto through a reciprocally slidable in the longitudinal direction, are and respectively formed on the proximal end A pair of upper and lower clippers-type cutting blades, each of which has a connection portion projecting from the pair of guide plates to the left and right sides in the width direction in plan view ,
Each inner end portion is configured to transmit power to a drive mechanism in the transmission case, and each connection portion formed at each outer end portion is detachably screwed and fixed to each connection portion of each clipper-type cutting blade body. It comprises a pair of upper and lower drive members that reciprocally drive the pair of hair clipper-type cutting blade bodies in opposite directions to each other,
Each of the clipper-type cutting blades is provided with a group of notches through which each of the connecting members can pass continuously to each of the guide holes,
The above-mentioned group of notches is opened at the side edge opposite to each connection part of each clipper-type cutting blade body, so that a pair of upper and lower clipper-type cutting blades are laterally left and right with respect to a pair of upper and lower guide plates. A clipper-type cutting blade attachment / detachment structure characterized by being configured to be detachable.

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