JP3363776B2 - Pruning machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trimmer capable of pruning a plant tree or shaping an hedge by a reciprocating motion of a pair of blades, and in particular, foreign matter such as vegetation is caught between the pair of blades. The present invention relates to a blade that reciprocates in opposition to each other due to eccentric rotation of an eccentric cam when the blade stops moving.

[0002]

2. Description of the Related Art Conventionally, as a mower of this type, as shown in FIG. 8, a drive shaft 52 which is rotatably supported by a housing 50 through a bearing 51 and has a gear portion 52a on the lower end side, and a housing. Fixed shaft 5 press-fitted in 50
4 is rotatably supported by the gear 4 and a gear portion 52a of the drive shaft 52.
A main gear 53 engaged with the main gear 53, a pair of upper and lower eccentric cams 55, 56 attached to the lower surface of the main gear 53 and rotatably supported by a fixed shaft 54 so as to be eccentrically rotatable, and engaged with the eccentric cams 55, 56. A pair of upper and lower blades 57, 58
A pair of support plates 59 and 60 for supporting the blades 57 and 58 from above and below, and a pair of support plates 59 and 60 sandwiching the support plates 59 and 60 from above and below with a predetermined gap so that the blades 57 and 58 can move back and forth. Fixing screw 61 for fixing
It is known to have the following.

In the trimmer having the above structure, when the drive shaft 52 is rotationally driven, the main gear 53 is rotated and the eccentric cams 55 and 56 fixed to the main gear 53 are eccentrically rotated, and the pair of blades 57 is rotated by the eccentric rotation. , 58 reciprocate back and forth with respect to each other. Therefore, the comb-teeth-shaped blades (partially omitted) formed on the front side of the pair of blades 57 and 58 alternately swing back and forth, so that the branches and leaves of a plant or the like can be cut.

When performing the pruning work in this way,
A foreign substance such as a plant or the like is caught in the space 62 between the pair of upper and lower blades 57 and 58, which impedes the blades 57 and 58 from reciprocating, which causes a so-called locked state (the drive force of a drive unit such as a motor drives the drive shaft). The blades 57 and 58 may not move even if 52 is rotated.

[0005]

In such a case, in the above-mentioned conventional trimmer, the lower support plate 60 for closing the opening of the housing 50 is opened and the lower blade 58 is provided.
It has been attempted to remove the foreign matter that is the cause of the locked state once, but since the blade 58 must be removed and disassembled in this manner, it must be reassembled, so the foreign matter removal work was very complicated.

On the other hand, as a means for removing foreign matters without disassembling the blade as described above, the drive shaft 52 and the main gear 5 are used.
Although a means for forcibly moving the blade by manually moving 3 is also used, in such means, a spanner or the like is attached to the gear portion 52a of the drive shaft 52 or the outer peripheral portion (gear portion) of the main gear 53. Since the manual operation member is bitten, and the drive shaft 52 is forcibly rotated by the manual operation member, the mountain of the gear portion may be crushed by the manual operation member and the shape thereof may be deformed. was there.

Further, in the means for removing foreign substances without disassembling the blade, the opening of the housing must be opened, that is, the lower support plate 60 which also functions as a lid of the housing is removed. There was also a problem that the work had to be performed without fail, and that disassembly work was eventually necessary.

The present invention has been made in view of the above-mentioned conventional problems, and it is necessary to manually move the blades such as when the blades do not move due to foreign matter being caught between the pair of blades. In this case, it is a first object of the present invention to provide a mower that can easily rotate the drive shaft and the like to move the blade without damaging the gear portion of the drive shaft and the like. Further, it is a second object to provide a trimmer that can easily rotate the drive shaft and the like to move the blade without performing any disassembling work.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a mower according to the present invention is
The housing 3 is provided with a rotary drive member that is provided with at least a pair of eccentric cams 6 and 7 that eccentrically rotates, and a pair of blades 8 and 9 that reciprocate oppositely to each other by the rotation of the rotary drive members. In the trimmer,
A fitting portion 1 into which an end surface of the rotary drive member can be fitted with a manually operated member used for rotating the rotary drive member.
It is characterized in that 0 is formed.

Here, the manual operation member means a member such as a tool which has a fitted portion which fits into the fitting portion of the rotary drive member and which is interposed between the rotary drive member and the hand. For example, a hexagon wrench, a driver, a simple rod-shaped body, a manual operation unit 18 described later, and the like are applicable. Further, the fitting portion 10 refers to a portion formed in a shape into which the fitted portion of the manual operation member can fit. For example, when the manual operation member is a hexagon wrench, the fitting portion 10 has an eccentricity. The hexagonal hole formed on the end surface of the rotary drive member such as the cam 6 corresponds to this.

Further, the rotary driving member means a member which transmits the driving force of a driving means such as a motor by rotating to reciprocate the blades 8 and 9, for example, eccentric cams 6 and 7. As other rotary drive members, when a drive shaft 1 directly connected to a shaft such as a motor, a main gear 4 such as a reduction gear, and the like are provided in the housing 3, these are also included.

In the trimmer according to the present invention, the end face of the rotary drive member is provided with the fitting portion 10 conforming to the shape of the fitted portion of the manually operated member used for rotating the rotary drive member. Since the blades 8 and 9 are provided, if the blades 8 and 9 are locked and the user wants to manually move the blades 8 and 9, they can be easily rotated by fitting the fitted portion of the manual operation member into the fitting portion 10. Since the drive member can be turned and the fitting portion 10 conforms to the shape of the manually operated member,
There is no risk of damaging the rotary drive member.

Further, as described in claim 2, there is provided a drive shaft 1 which is rotatably supported by a housing 3 as the rotary drive member, and the fitting portion 10 is formed on an end face of the drive shaft 1. If so, the drive shaft 1 can be rotated by using the manual operation member to manually move the blades 8 and 9, and the manual operation is simple, which is preferable.

Further, as described in claim 4, the housing 3 is rotatably provided with a manual operating portion 18 as a manual operating member, and the manual operating portion 18 can be moved into and out of the housing 3. Is provided in the manual operation unit 1
By making 8 project, the fitted part is fitted to the fitting part 1.
In the configuration of fitting to 0, the fitted portion of the manual operating portion 18 is fitted to the fitting portion 10 only by protruding the manual operating portion 18 from the outside of the housing 3, and the manual operating portion 18 The rotation driving member can be rotated by rotating. Therefore, when the blades 8 and 9 are moved, disassembly work such as removal of the opening / closing lid of the housing 3 is not required at all, which is preferable.

Further, according to a fifth aspect of the present invention, a drive shaft 1 which is rotatably supported by a housing 3 and has a gear portion 1a, and a main gear which meshes with the gear portion 1a of the drive shaft 1. 4, a pair of eccentric cams 6 and 7 attached to the main gear 4, and a pair of blades 8 and 9 that reciprocate opposite to each other by eccentric rotation of the eccentric cams 6 and 7. In the housing 3, an engagement / disengagement gear 21 having a gear portion 21a is rotatably provided.
In the trimmer, which is provided so as to be able to move in and out, and the gear portion 21a of the engagement / disengagement gear 21 is projected so as to be able to mesh with the gear portion 1a of the drive shaft 1 or the main gear 4. From the outside of the housing 3
The gear portion 21a can be engaged with the gear portion 1a of the drive shaft 1 and the like, and the engagement / disengagement gear 21 can be rotated to rotate the rotary drive member. Therefore, it is preferable that the fitting portion 10 is not required to be formed on the rotary drive member and the like, and that no disassembling work is required when moving the blades 8 and 9.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. 1 and 2,
Reference numeral 1 denotes a drive shaft for transmitting a drive force of a drive means (not shown) such as a motor, and the drive shaft 1 is rotatably supported by a housing 3 via a bearing 2 and has a lower end side. Is formed with a gear portion 1a. An outer peripheral portion 4a (gear portion) of the main gear 4 is meshed with the gear portion 1a,
The main gear 4 is rotatably supported by a fixed shaft 5 whose upper end side is press-fitted and fixed to the housing 3.

A pair of disc-shaped eccentric cams 6 and 7 are attached to the lower surface of the main gear 4 so as to face each other vertically.
It is provided so as to be eccentrically rotatable about the fixed shaft 5. Both eccentric cams 6 and 7 are fixed with a phase of 180 degrees.

The eccentric cams 6 and 7 have inner peripheries of substantially oval engagement rings 8a and 9a on the rear side of the blades 8 and 9 on which comb teeth-shaped blades (partially omitted) are formed on the front side. The pair of blades 8 and 9 which face each other are engaged with each other and are opposed to each other by the eccentric rotation of the eccentric cams 6 and 7 sliding on the inner peripheral surfaces of the engagement rings 8a and 9a. Can be alternately reciprocated (see FIG. 2).

That is, the rotational drive of the drive shaft 1 rotated by a power source such as electricity is transmitted to the eccentric cams 6 and 7 via the main gear 4 so that the blades 8 and 9 can reciprocate, and the drive shaft 1 And main gear 4 and eccentric cams 6, 7
Corresponds to the rotary drive member.

Furthermore, a manual operation member (for example,
A fitting portion 10 (for example, a hexagonal hole) in which an end portion (corresponding to a fitted portion) of a hexagon wrench can be fitted is formed in the axial direction. The shape of the fitting portion 10 is relatively determined by the shape of the fitted portion such as the end of the manually operated member.

In addition, the rear center portion of the engagement ring 9a of the lower blade 9 is cut out so that the fitting portion 10 formed on the drive shaft 1 is exposed from below.

As shown in FIG. 1, the blades 8 and 9 are supported by a pair of support plates 11 and 12 from above and below, and the support plates 11 and 12 are fixed from above and below by a fixing screw 13. The fixing screw 13 is provided with a spacer 15 that engages with long holes 14 and 14 formed in the upper and lower blades 8 and 9, and the spacer 15 allows the upper and lower separating distances of the two support plates 11 and 12 to be separated from each other. Two blades 8 and 9 which are set and opposed to each other can reciprocate back and forth. In addition, the lower support plate 12
Is configured as an opening / closing lid which is attached to the opening at the bottom of the housing 3 and covers the opening.

Next, the usage state of the mower configured as described above will be described. When the drive shaft 1 is rotated by a drive means such as a motor, the rotation of the main gear 4 causes the upper and lower eccentric cams 6 and 7 to eccentrically rotate about the fixed shaft 5,
The blades 8 and 9 are alternately reciprocated back and forth.
By reciprocating the blades 8 and 9 back and forth, a plant or the like can be pruned with a comb-shaped blade.

During the use of the mower, foreign matter such as vegetation is caught between the pair of blades 8 and 9 and the blades 8 and 9,
In the case where 9 is in the locked state, the fitting portion 10 of the drive shaft 1 appears by removing the lower support plate 12 as the opening / closing lid and opening the lower opening of the housing 3 (see FIG. 2). Fit the end of the manually operated member to the joint 10,
Moreover, by rotating the tool by hand, the drive shaft 1 can be forcibly rotated to remove foreign matter from the blades 8 and 9.

As described above, the blades 8 and 9 can be easily moved manually if necessary, and the drive shaft 1 is provided with the fitting portion 10 conforming to the shape of the manually operated member. There is also no risk of damaging the rotary drive member such as the drive shaft 1. Not only when removing foreign matter, but also when the blades 8 and 9 are used.
The mower according to the present invention is also effective when adjusting the positions of the blades 8 and 9 when exchanging the blades.

In the above embodiment, the fitting portion 10
Are formed on the drive shaft 1, but other rotary drive members,
For example, as shown in FIG. 3, a fitting portion 10 having a predetermined shape may be formed so as to penetrate the end surface of the eccentric cam 7, and although not particularly shown, the fitting portion 10 is provided on the end surface of the main gear 4. It may be formed. However, if the fitting portion 10 is formed at the center of rotation of the drive shaft 1 as in the above embodiment,
Since the drive shaft 1 rotates by turning the manual operation member around the fitting portion 10, there is an advantage that the manual operation is simple.

Further, in the above embodiment, the fitting portion 10
Is formed in one place on the drive shaft 1 which is a rotary drive member, but a plurality of rotary drive members may be formed in one rotary drive member. Further, the rotary drive member is formed as in the above embodiment. And main gear 4 and a pair of eccentric cams 6, 7
When it is made of, the fitting portion 10 may be formed on one or more members.

Further, in the above embodiment, the fitting portion 10 is formed on the rotary driving member. For example, as shown in FIG. 4, the gear portion of the drive shaft 1 is provided inside the upper surface of the housing 3. Rotatably supporting an auxiliary gear 16 meshing with 1a,
The fitting portion 10 that fits into the fitted portion of the manually operated member may be formed at the center of rotation of the lower surface (end surface) of the auxiliary gear 16.

The auxiliary gear 16 rotates in accordance with the rotational drive of the drive shaft 1 when the mower is used. On the other hand, the auxiliary gear 16 can be manually rotated by fitting a manual operation member into the fitting portion 10.

Even if the auxiliary gear 16 having the fitting portion 10 is provided in this manner, the fitting portion of the manual operation member is fitted to the fitting portion 10 of the auxiliary gear 16 as in the above embodiment. Then, when the auxiliary gear 16 is manually rotated, the drive shaft 1 rotates and the blades 8 and 9 can be moved.

The rotary drive member meshing with the auxiliary gear 16 is not limited to the drive shaft 1, but may be another rotary drive member having a gear portion such as the main gear 4 or the like. When the auxiliary gear 16 is provided, as shown in FIG. 4, the fitting portion 10 may be formed on the rotation driving member,
Further, it is not necessary to form the fitting portion 10 on the rotation driving member,
It is optional.

Further, in the above embodiment, the fitting portion 1
Although 0 has a concave shape such as a hexagonal hole, for example, as shown in FIG. 5, a convex fitting portion 10 may be used.

Further, in the above embodiment, when the blades 8 and 9 are manually moved, the opening / closing lid 12 has to be removed from the housing 3, but the following manual operation section or engagement / disengagement gear is provided. In the case of the trimmer, the blades 8 and 9 can be manually moved from the outside of the housing without removing the opening / closing lid 12, and there is an advantage that the disassembling work is not required at all.

That is, as shown in FIG. 6, a fitting portion 18a fitted to the fitting portion 10 of the drive shaft 1 is provided on the opening / closing lid 12 located on the extension of the drive shaft 1 so as to project inward. Manual operation part 1
8 is rotatably provided, and the manual operation portion 18 is fitted in a tubular portion 19 projecting inwardly on the opening / closing lid 12 of the housing 3 and provided at the upper end of the tubular portion 19. An elastic body 20 such as a spring is fitted between the stopper 19a and the collar portion 18b provided at the lower end of the manual operation portion 18, and is provided so as to be retractable in the housing 3.

The elastic body 20 allows the manual operation section 18 to be operated.
6 is normally biased to the outside of the housing 3, as shown in FIG.
Are separated from each other (Note that the fitted portion 18a of the manual operation portion 18 is
Since the engaging portion 18c that is engaged with the stopper 19a is provided below the stopper, the manual operating portion 18 does not fall off the opening / closing lid 12). As shown in (b), the fitted portion 18 a that projects into the housing 3 and has the fitted portion 18 a of the drive shaft 1
And a manual operation member such as a hexagon wrench is fitted into the fitting portion 10 (for example, a hexagonal hole or the like) formed on the outside of the manual operation portion 18 (or the grip portion (on the outside of the manual operation portion 18 When a protrusion that can be picked up with a finger or the like) is formed, the drive shaft 1 can be rotated by directly rotating the finger or the like.

The fitted portion 18a of the manual operation portion 18
Is not limited to the configuration that fits into the fitting portion 10 provided on the drive shaft 1, but may be provided so as to fit into the fitting portion 10 formed on the eccentric cams 6, 7 and the auxiliary gear 16 described above. Good.

Further, in the above embodiment, the fitting portion 10 is formed on the rotary driving member or the like.
As in the case of the manual operation unit 18, the housing 3 is provided rotatably and retractably as shown in FIG.
Gear portion 1a (or main gear 4 though not particularly shown)
A trimmer having a configuration in which an engagement / disengagement gear 21 around which a gear portion 21a that can be meshed with another rotation driving member having a gear portion) is provided.

When the engagement / disengagement gear 21 is projected, the gear portion 21a meshes with the gear portion 1a of the drive shaft 1.
In that state, the blades 8 and 9 can be moved by rotating the engagement / disengagement gear 21 (by a manually operated member or directly by hand). According to the trimmer, there is an advantage that the disassembling work is unnecessary and the labor for forming the fitting portion 10 on the rotation driving member can be saved.

[0039]

As described above, in the trimmer according to the present invention, since the rotary drive member is provided with the fitting portion into which the fitted portion of the manually operated member can be fitted, When it is necessary to move the blades manually, such as when the blades do not move due to foreign matter getting caught between the pair of blades, the manual operation member is used without damaging the gear etc. of the drive shaft. The blade can be easily moved.

In particular, if the fitting portion is formed on the end face of the drive shaft as in the means of claim 2, manual operation is easy.

Further, in the mower according to claims 4 and 5, the rotary drive member can be rotated from the outside of the housing without removing the opening / closing lid of the housing, and the disassembling work can be performed when the blade is moved. It has the effect of not being accompanied at all.

[Brief description of drawings]

FIG. 1 is a partially omitted sectional view showing a trimmer according to an embodiment of the present invention. In the drawings, the cross-sectional shapes of the drive shaft, the fixed shaft, and the fixed screw are not shown, and the meshing portion of the gear portion is shown by a chain line (same in FIGS. 5 to 7).

FIG. 2 is a partially omitted bottom view showing a trimmer according to an embodiment of the present invention. In the figure, the lower support plate (opening / closing lid), the fixing screw, and the main gear are omitted (same in FIGS. 3 and 4).

FIG. 3 is a partially omitted bottom view showing a trimmer according to another embodiment of the present invention.

FIG. 4 is a partially omitted bottom view showing a trimmer according to another embodiment of the present invention.

FIG. 5 is a partially omitted sectional view showing a trimmer according to another embodiment of the present invention.

FIG. 6 is a partially omitted cross-sectional view showing a trimmer according to another embodiment of the present invention, in which (a) shows a state where the manual operation part is not fitted to the fitting part (enlargement of the manual operation part). (Including figure),
(B) shows a state in which the manual operation part is fitted in the fitting part.

FIG. 7 is a partially omitted cross-sectional view showing a trimmer according to another embodiment of the present invention.

FIG. 8 is a partially omitted sectional view showing a conventional trimmer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Drive shaft, 1a ... Gear part of drive shaft, 3 ... Housing,
4 ... Main gear, 6, 7 ... Eccentric cam, 8, 9 ... Blade, 10 ... Fitting section, 16 ... Auxiliary gear, 18 ... Manual operation section, 21 ... Engagement gear, 21a ... Engagement gear section

Claims (5)

(57) [Claims] 1. A rotary drive member provided in a housing (3) and comprising at least a pair of eccentric cams (6, 7) for eccentric rotation, and reciprocating motion facing each other due to rotation of the rotary drive member. In a trimmer comprising a pair of blades (8, 9), a fitting portion of a manually operated member used for rotating the rotation driving member can be fitted to an end surface of the rotation driving member. A trimmer having a joint (10) formed therein. 2. The rotary drive member comprises a housing (3).
And a pair of eccentric cams (6, 7) that are eccentrically rotated by the drive of the drive shaft (1) being transmitted to the drive shaft (1). ) End face,
A trimmer according to claim 1, wherein the fitting portion (10) is formed. 3. The rotary drive member is a housing (3).
A drive shaft (1) that is rotatably supported by the drive shaft and has a gear portion (1a), a main gear (4) that meshes with the gear portion (1a) of the drive shaft (1), and the main gear (4). ) And a pair of eccentric cams (6, 7) mounted on the drive shaft (1) or a main gear (4) of the drive shaft (1) is engaged with a rotatable auxiliary gear (16). The trimmer according to claim 1, wherein the fitting portion (10) is formed on an end surface of the auxiliary gear (16). 4. The housing (3) is rotatably provided with a manual operation part (18) as a manual operation member, and the manual operation part (18) can be retracted into the housing (3). Is provided on the fitting portion (10) by protruding the manual operation portion (18).
The mower according to any one of claims 1 to 3, which is capable of being fitted to. 5. A drive shaft (1) rotatably supported by a housing (3) and having a gear portion (1a), and a main gear formed by meshing with the gear portion (1a) of the drive shaft (1). (4), the pair of eccentric cams (6, 7) attached to the main gear (4), and a pair of blades (8) that reciprocate to face each other by eccentric rotation of the eccentric cams (6, 7). , 9), the housing (3) is rotatably provided with an engagement / disengagement gear (21) having a gear part (21a), and the engagement / disengagement gear (21) is , The housing (3) is provided so as to be able to extend and retract, and the gear portion (21a) of the engaging and disengaging gear (21) is projected so that the gear portion (1) of the drive shaft (1).
A mower characterized in that it is configured to be meshable with a) or the main gear (4).