JPH022186Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a reciprocating cutting blade used in a lawn mower or the like.

A conventional reciprocating cutting blade 1 used for a lawn mower etc.
As shown in FIGS. 1 and 2, a strip-shaped movable substrate 3 is placed on a receiving blade 2 in which a large number of receiving blade portions 2a, 2a, . . .
A cutting blade 4 in which a large number of cutting blade parts 4a, 4a... are protruded from the front edge of the cutting blade part 4a, 4a, .
are stacked on top of each other, and furthermore, two sets of bolts and nuts 6, 6 are attached to the cutting blade holders 5, 5, respectively, on the fixed base plate 2b.
the sliding guide pieces 5a, 5 of each cutting blade holder 5.
a (see Fig. 2) to guide the longitudinal outer surfaces 3a, 3a of the band-shaped movable substrate 3, and press the upper surfaces of the cutting blade parts 4a, 4a... with the pressing pieces 5b of each cutting blade holder 5 to release the cutting blades. By bringing 4 into close contact with the receiving blade 2, the cutting blade 6
is configured to be able to slide back and forth along the longitudinal direction. However, the conventional reciprocating reaping blade 1 has the following drawbacks.

When a plurality of cutting blade holders 5, 5... are fixed to the fixed base plate part 2b with two sets of bolts and nuts 6, 6, the sliding guide pieces 5a, It requires a high degree of skill and a long time to fix the strip-shaped movable substrate 3 in a predetermined position so as not to forcefully press the longitudinal outer surfaces 3a, 3a of the strip-shaped movable substrate 3.

Therefore, in order to re-sharpen the receiving blade 2 and the cutting blade 4, the cutting blade holder 5 is removed from the fixed base plate part 2b, the receiving blade 2 and the cutting blade 4 are separated, and after both are polished, the cutting blade holder 5 is When fixing the blade holder 5 again to the fixed base plate part 2b, if the user is inexperienced in disassembling and reassembling the reciprocating cutting blade 1, it is recommended that the two sets of bolts and nuts 6, 6 be tightened to the predetermined state to hold the cutting blade holder 5. It is difficult to fix the fixed base plate part 2b at a predetermined position, and the sliding guide pieces 5a, 5 of the cutting blade holder 5
a (see FIG. 2) may be assembled in a state in which it is strongly pressed against the longitudinal outer surfaces 3a, 3a of the band-shaped movable substrate 3. In this case, the receiving blade 2 and the cutting blade 4 are abnormally elevated due to the frictional heat generated by the large friction between the sliding guide pieces 5a, 5a of the cutting blade holder 5 and the longitudinal outer surfaces 3a, 3a of the band-shaped movable base plate 3. This may cause burns to the worker, and the blades 2 and 4 may lose their sharpness. Furthermore, the reaper main body (not shown) that drives the reciprocating reaping blade 1 back and forth may be overloaded, causing damage to the drive system of the reaper main body.

Furthermore, when it is necessary to adjust the degree of closeness between the cutting blade 4 and the receiving blade 2 depending on the type of material to be cut, the two sets of bolts and nuts 6, 6 that attach and fix each cutting blade holder 5 are loosened. After that, it is necessary to interpose a shim (not shown) between the cutting blade holder 5 and the fixed substrate 2b for assembly, or to replace it with a pressing tool (not shown) without the pressing piece 5b. However, for users who are inexperienced in disassembling and reassembling the reciprocating reaping blade 1, there is a risk that the receiving blade 2 and the reaping blade 4 may become abnormally heated or cause damage to the drive system of the reaping machine body, as described above. There is.

The present invention aims to provide a reciprocating reaping blade to solve the above-mentioned drawbacks.

The gist of the present invention is that a large number of cutting blades are protruded in parallel from the front edge of a band-shaped movable board, and a large number of cutting blades are protruded in parallel from the front edge of a band-shaped movable board on the upper surface of the receiving blade. In the reciprocating reaping blade in which installed cutting blades are stacked so as to be slidable in the left and right direction, a band-shaped fixed clamping plate is stacked on the movable base plate, and from a seat located above the upper surface of the fixed clamping plate. A plurality of pressing tools each having a protruding cutting blade pressing portion and a centering surface that engages with a locking side surface formed at a suitable position of the fixed clamping plate are arranged at appropriate pitches along the left and right direction. is,
A reciprocating guide elongated hole drilled in the movable substrate along the reciprocating direction, an insertion hole drilled in the fixed clamping plate, and an insertion hole drilled in the seat of the pressing tool are inserted into the fixed substrate. A connecting pin is provided to protrude from each pressing tool, and a fixture for pressing the pressing tool is removably attached to the upper end of the connecting pin, and is inserted into the reciprocating guide elongated hole of the movable base plate. is that a distance is inserted that transmits the supporting reaction force from the fixed substrate to the pressing tool.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings. FIG. 3 is a partially cutaway plan view showing an embodiment of a reciprocating reaping blade 30 (hereinafter referred to as the proposed blade) according to the present invention, and 13 in the figure is a receiving blade. The receiving blade 13 is attached to the front edge 11a of the band-shaped fixed substrate 11.
A large number of receiving blade portions 12, 12, . They are formed in large numbers at appropriate pitches (for example, 120 mm) along the direction of arrow C). In the rear edge 11c of the fixed substrate 11, notches 11d, 11d, . . . for connecting and fixing are formed at appropriate pitches. Furthermore, on the surface of the fixed substrate 11, a depth of 0.1 is provided along the longitudinal direction near the center.
A relief groove 18 having a diameter of 2.0 mm to 2.0 mm (preferably 0.2 to 0.5 mm) is provided. In the bottom surface 18a of the relief groove 18, small diameter (for example, 10 mm diameter) through holes 19, 19 that open on the back surface of the fixed substrate 11 are bored near both left and right sides of the female screw 11b, and large diameter (e.g. 20mm diameter) through hole 2
0,20 (see FIG. 5) are the female screws 11b, 1
The holes are drilled so as to roughly divide the interval 1b into three equal parts. Incidentally, in the bottom surface 18a of the escape groove 18, through holes 21 are formed at appropriate pitches for locking a sole 31 (see FIG. 8), which will be described later, as necessary. A relief groove 18 is formed on the surface of the receiving blade 13.
The cutting blades 16 overlapped so as to cover the cutting blades 15, 1 from the front edge 14a of the band-shaped movable base plate 14.
5... are provided in a protruding manner with a pitch B that is twice the pitch A, and the reciprocating motion guide elongated hole 14b is located at a position corresponding to the female screw 11b of the fixed base plate 11 in the reciprocating motion direction (in the direction of arrow C). ). Note that the pitch B is not limited to twice the pitch A, and although not shown, it is of course possible to have the same pitch or a pitch that is twice or more. A band-shaped fixed clamping plate 17 is superimposed on the movable substrate 14. Further, on the fixed clamping plate 17, the female screw 1 of the fixed base plate 11 is mounted.
One pressing tool 22 is arranged at a position corresponding to 1b. The pressing tool 22 is attached to the fixed clamping plate 17.
A cutting blade pressing portion 22b is provided protruding from a seat portion 22a located above the upper surface of the fixed clamping plate 17.
Centering surfaces 22c, 22c are formed in a locking relationship with the longitudinal side surface 17b, which is a locking side surface. Although the centering surface 22c of the pressing tool 22 is not shown in the drawings, the front and rear edges of the seat portion 22a are folded so that it comes into contact with the longitudinal side surface 17c of the fixed clamping plate 17 or both longitudinal side surfaces 17b and 17c. It may also be formed by bending. Furthermore, the pressing tool 22 is fixed to the clamping plate 1.
Although not shown in the figure, the outer surface of the engagement pin protruding from the lower surface of the seat portion 22a is locked to the inner surface of a locking hole formed in the fixed clamping plate 17. Of course, it is also possible to adopt an appropriate structure such as A fixed base plate 1 of a pressing tool 22 that presses and holds the cutting blade 16 on the receiving blade 13 so as to be able to slide freely.
As shown in FIG. 4, the structure for fixing the connector pin 1 to the connector pin 1 includes a connecting pin 24 made of a bolt with a head screwed onto the male screw 11b of the fixing board 11, and a collar 23a and a shim 23b fitted onto the connecting pin 24. Insert the distance 23 into the insertion hole 17a of the fixed clamping plate 17 and the reciprocating guide elongated hole 14b of the movable base plate 14, and insert the tip of the connecting pin 24 into the insertion hole 22d of the pressing tool 22. After the lower surface of the left portion 22a is brought into contact with the shim 23b, a fixing member 25 made of a nut or the like is attached to the tip of the connecting pin 24 to reduce the supporting reaction force from the fixed substrate 11 to the destance 2.
3 to the seat portion 22a of the pressing tool 22. In the figure, reference numeral 27 denotes a driven pin attached to the cutting blade 16 at appropriate pitches.

FIG. 6 is a sectional view showing another embodiment of the proposed blade 30', and the major difference from the embodiment shown in FIG. 4 is that the connecting pin and the collar constituting the distance are integrated. The lower small diameter portion 33a of the formed double stepped pin 33 is inserted into the through hole 11'b of the fixed substrate 11'.
A female threaded portion 33 formed in the upper small diameter portion 33b of the double stepped pin 33 with a shim 23b interposed in the upper step portion as necessary.
This is the point where a fixing member 25' consisting of a bolt is screwed into point c.

Next, the disassembly and assembly procedure of the proposed blade 30 will be explained based on FIGS. 3 and 4. When resharpening the receiving blade 13 and the cutting blade 16, the fixing tool 25 is removed from the connecting pin 24, and then the pressing tools 22, 22, . . . , the fixed clamping plate 17, the cutting blade 16, and the receiving blade 13 are separated. When the cutting blade 16 and the receiving blade 13 have been re-sharpened, the cutting blade 16 is superposed on the receiving blade 13, and the fixed clamping plate 17 is superposed on the cutting blade 16.
Subsequently, the pressing tool 17 is placed on the fixed clamping plate 17 while the centering surface 22c of the pressing tool 22 is locked to the locking side surface 17b of the fixed clamping plate 17, and then fixed to the upper end of each connecting pin 24. Attach the fixture 25 and fix the fixture 25.
The pressing tool 22 is held between the and the distance 23. When adjusting the pressing force of the pressing tool 22 on the cutting blade part 15, the fixing tool 25 is removed from the connecting pin 24, the pressing tool 22 is removed from the top of the fixed clamping plate 17, and the shim 23b constituting the destance 23 is removed. After adjusting the number of sheets, the pressing tool 22 is placed on the fixed clamping plate 17 while the centering surface 22c of the pressing tool 22 is locked to the locking side surface 17b of the fixed clamping plate 17, and the connecting pin 24 is
A fixing tool 25 is attached to the upper end of the press tool 22, and the pressing tool 22 is held and fixed between the height-adjusted distance 23 and the fixing tool 25 to perform adjustment. In addition, the pressing tool 22
When it is not necessary, remove the pressing tool 22,
After adjusting the number of shims 23b as necessary, fix the clamping plate 1 with the fixture 25 attached to the connecting pin 24.
7 is directly pressed and fixed.

Next, a method of using the proposed blade 30 will be explained based on FIGS. 7 and 8. The rear edge portion 11c of the fixed base plate 11 is connected and fixed to the connecting portions 26a, 26a of the reaper main body 26 with bolts 29, 29 using the notches 11d, 11d, and the reaper main body 2
The bifurcated output end 28a of the sliding drive device 28 provided at 6 is connected to the driven pin 27. One sole 31 is connected and fixed to both ends of the band-shaped fixed substrate 11 as necessary. The cutting blade 16 receives a drive output from a sliding drive device 28 and reciprocates along the longitudinal direction (in the direction of arrow C) with an amplitude having approximately the same dimension as the pitch A. A part of the grass juice generated by cutting the grass with the reciprocating motion of the cutting blade 16 becomes muddy with the fine fibers of the grass 32 and fine soil attached to the grass, and is transferred to the receiving blade 13 and the cutting blade 13. It penetrates into the sliding portion 30a that is in close contact with the blade 16. Although the internal pressure of the mud-like fine particles that have penetrated into the sliding portion 30a and become trapped in the sliding portion 30a increases slightly, the small-diameter through-holes 19, 19, etc. inside the low-pressure relief groove 18, etc. ... and large-diameter through holes 20, 20, and is discharged to the outside via the through holes 19, 19, . When the mowing work is finished, when water is poured into the cutting blade parts 15, 15, . The mud-like fine particles are automatically washed away from the through holes 19, 19..., 20, 20... to the outside. In addition, if you forget to remove the water jug when you temporarily stop the reaping work and the muddy fine particles trapped in the sliding part 30a and the relief groove 18 solidify, the reciprocating motion should be stopped before resuming the reaping work. The cutting blade portion 1 of the cutting blade 16 being
5, 15..., water penetrates into the sliding part 30a and the solidified fine particles become muddy and are washed away from the through holes 19, 19..., 20, 20... to the outside, so it is smooth. The cutting blade 16 can be moved back and forth.

In addition, when the protrusion pitch B of the cutting blade part 15 is made to be more than twice the protrusion pitch A of the receiving blade part 12,
It becomes possible to reduce the pitch A of the receiving blade portions 12, 12, . . . As a result, the adjacent blade part 1
Since the distance in which the reciprocating cutting blade part 15 presses the grass 32 that has fallen between the blades 2 and 12 and moves it to the cutting position can be shortened, there is no need to push the grass 32 and mowing can be performed with a small cutting force. In addition, it is difficult for foreign objects such as stones, stakes, etc. (not shown) to get between the blade receiving parts 12, 12, so accidents of breaking the blade receiving part 12 are reduced.

As detailed above, the proposed blade has the following practical effects.

○B It has a structure in which a connecting pin protruding from a predetermined position on the fixed board is inserted into the reciprocating motion guide elongated hole of the movable board, and the support reaction force from the fixed board is transmitted to the seat of the pressing tool via the distance. Therefore, smooth reciprocating motion of the cutting blade can be maintained at all times. As a result, even if a user who is not familiar with the handling of reciprocating blades disassembles and reassembles them, smooth reciprocating movement of the cutting blades is guaranteed, and there is no abnormal temperature rise between the receiving blade and the cutting blades as in the case of conventional methods. This makes it possible for the operator to work safely, and the sharpness of the receiving blade and cutting blade does not become dull.

○B To fix the pressing tools, first place the centering surface of the pressing tool in contact with the locking side of the fixing clamp plate and bring the seat part into contact with the distance, then attach the fixing tool to the upper end of the connecting pin for each pressing tool. It can be done simply and quickly by simply attaching one piece at a time. As a result, even users who are inexperienced in handling reciprocating reaping blades can
It can be disassembled and reassembled simply, quickly and accurately, and maintenance such as re-sharpening of the cutting blade and receiving blade can be performed frequently.

○C The synergistic effect of ○B and ○B can improve work efficiency.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway plan view showing a conventional reciprocating reaping blade, Fig. 2 is an enlarged view cut along the - line of the same as above;
Fig. 3 is a partially cutaway plan view showing an embodiment of the reciprocating reaping blade according to the present invention, Fig. 4 is an enlarged view cut along the - line of the same as above, and Fig. 5 is an enlarged view cut along the - line of Fig. 3. , FIG. 6 is a sectional view showing another embodiment of the reciprocating reaping blade according to the present invention, and FIG. 7 is a plan view showing the reciprocating reaping blade according to the present invention attached to the main body of the reaper. , FIG. 8 is a side view of the same. DESCRIPTION OF SYMBOLS 11... Fixed board, 12... Receiving blade part, 13... Receiving blade, 14... Movable board, 15... Cutting blade part, 16...
...Mowing blade, 17... Fixed clamping plate, 17b... Locking side surface, 22... Pressing tool, 22c... Centering surface, 23...
...Destance, 25...fixture.

Claims (1)

[Claims for Utility Model Registration] 1. On the upper surface of a receiving blade in which a large number of receiving blades are protruded in parallel from the front edge of a band-shaped fixed board, cutting blades are arranged in parallel from the front edge of a band-shaped movable board. In the reciprocating reaping blade in which a large number of protruding cutting blades are stacked so as to be slidable in the left and right direction, a band-shaped fixed clamping plate is superimposed on the movable base plate, and is located above the upper surface of the fixed clamping plate. A plurality of pressing tools each having a cutting blade pressing portion protruding from the seat and a centering surface that engages with a locking side surface formed at an appropriate position of the fixed clamping plate are arranged at appropriate pitches along the left and right direction. The fixed board has a reciprocating guide elongated hole drilled along the reciprocating direction in the movable board, an insertion hole drilled in the fixed clamping plate, and a seat part of the pressing tool. A connecting pin that is inserted through the insertion hole is provided to protrude from each pressing tool, and a fixture that presses the pressing tool is removably attached to the upper end of the connecting pin, and the reciprocating movement of the movable substrate is A reciprocating reaping blade characterized in that a distance is inserted into the guide elongated hole to transmit a supporting reaction force from the fixed base plate to the pressing tool. 2. The reciprocating reaping blade according to claim 1, wherein the distance is externally fitted onto the connecting pin. 3. The reciprocating reaping blade according to claim 1, wherein the distance and the connecting pin are integrally formed. 4. The reciprocating reaping mower according to claim 1, 2, or 3, wherein the centering surface of the pressing tool is a surface that comes into contact with the longitudinal outer surface that is the locking surface of the fixed clamping plate. blade.