JP4469224B2 - Hedge trimmer - Google Patents

Description

  The present invention relates to a hedge trimmer used for horticultural work such as hedge trimming or pruning roadside trees, and more particularly to a hedge trimmer that can be applied to multiple types of trimming work by exchanging blades.

  Japanese Patent Laid-Open No. 2003-117267 (Patent Document 1) discloses a technique related to a hedge trimmer that can be applied to hedge cutting work and lawn cutting work. The hedge trimmer described in the above publication is a double-edged drive type that drives both of the two blades arranged above and below, and a main body provided with a rotary drive device, and a blade for hedges used for hedge cutting work The unit includes a lawn blade unit used for lawn mowing. The main unit is configured to perform the hedge or lawn trimming operation by exchanging the blade unit for the hedge and the blade unit for the lawn. According to such a hedge trimmer, because it can be applied to hedge and lawn mowing work by replacing the blade unit, it is more economical than a dedicated machine and it is a double-edged drive type that drives both blades. Compared with the single-blade drive type that drives one of the blades, there is an advantage that the pruning operation can be performed at a high speed.

By the way, the blade that is applied to the hedge cutting operation reciprocates linearly in the front-rear direction as viewed from the user and cuts the branches and leaves, whereas the blade that is applied to the grass cutting operation is the blade for the hedge In this configuration, the lawn is cut by swinging back and forth in a circular arc shape in the left-right direction, which is a direction orthogonal to the moving direction. In the case of the conventional hedge trimmer described in the above publication, the unit structure includes not only the blade but also the cam for reciprocating the blade, and by replacing the blade of this unit structure, that is, the blade unit, the hedge and Lawn mowing is possible. However, each blade unit is configured to have a dedicated cam, and the number of dedicated cams corresponding to the number of blades is required. As a result, the structure becomes complicated, the cost increases, or the weight increases, and there is still room for improvement in this respect.
JP 2003-117267 A

  The present invention has been made in view of such a point, and an object of the present invention is to provide a technique effective in reducing cams in a hedge trimmer that can be applied to a plurality of types of trimming operations.

In order to achieve the above object, the invention described in each claim is configured.
According to the first aspect of the present invention, the main body portion that accommodates the rotation driving device, at least the first, second, and third cams that are attached to the rotation member of the rotation driving device, and the main body portion are selectively used. A hedge trimmer is configured having at least first and second types of double-edged drive blade devices that are detachable. Here, the “rotary member of the rotational drive device” refers to a rotational member that transmits the rotational output of the electric motor as a drive source to the cam device, and transmits the rotational output directly to the cam. It typically includes a driven gear or a rotating shaft that rotates integrally with the driven gear. As the “cam”, an eccentric cam (disk cam) is typically used. However, the cam is not limited to the eccentric cam, and a heart cam, a tangential cam, a yoke cam, or the like can be preferably used. In short, the cam is not particularly specified as long as it has a configuration capable of transmitting rotational power to the driven blade device. In addition, “selectively detachable” means that in the state where the first type double-blade drive type blade device is mounted, the second type double-blade drive type blade device is removed, and the second type double-blade drive type. The state in which the type blade device is mounted refers to a state in which the first-type double-blade drive type blade device is removed, which means a configuration capable of so-called replacement mounting.

According to the hedge trimmer of the present invention, as a characteristic configuration, the first and second double-blade drive type blade devices are respectively connected to two of the cams when mounted on the main body, and the cams rotate. The first double-edged blade having a pair of blades that perform the cutting operation of the workpiece by reciprocating in an opposing manner based on the operation, and the first double-edged drive blade device mounted on the main body. The pair of blades of the drive blade device is configured to be connected to the first and second cams, and the second double blade drive blade is in a state where the second double blade drive blade device is mounted on the main body. The pair of blades of the apparatus is configured to be connected to the second and third cams. The second cam moves in the same manner as the first cam with respect to the pair of blades of the first double-blade drive blade device when the first double-blade drive blade device is mounted on the main body. When the second double-blade drive type blade device is mounted on the main body, the third cam for the pair of blades of the second double-blade drive type blade device. The mounting position with respect to the rotating member is displaceable between the first position and the second position so as to be disposed at the second position that gives the same amount of movement .
The term “a pair of blades” refers to two blades arranged so as to overlap each other. Typically, two blades overlap each other, and a blade for hedges that reciprocates linearly or two blades. This is the case for grass blades that overlap with each other and are reciprocated in an arc shape. Further, the “displaceable” form preferably includes any form in which the second cam is displaced alone with respect to the rotating member, or any form in which the second cam is displaced integrally with the first and third cams. Moreover, both the aspect which changes by changing a cam with respect to a rotating member, and the aspect which changes a position in the state with mounting | wearing suitably are included suitably.

  The hedge trimmer according to the present invention can be applied to different types of trimming operations by appropriately replacing the first and second types of double-edged drive blade devices. In this case, in the present invention, the second cam among the first, second, and third cams can be shared for driving the first and second double-blade drive blade devices, so the number of cams can be reduced. It became possible to reduce compared to the conventional. As a result, the hedge trimmer can be simplified in structure, reduced in cost, or reduced in weight.

(Invention of Claim 2)
According to the second aspect of the present invention, the first and second cams of the hedge trimmer according to the first aspect of the present invention are the two cams in the state where the second cam is mounted at the first position. The midpoint of the line segment connecting the centers is set to be the center of rotation, and the second and third cams are located between the centers of the two cams when the second cam is mounted at the second position. The midpoint of the line segment connecting the two is set to be the center of rotation. With such a configuration, a cam position with a suitable eccentric amount corresponding to the double-blade drive type blade device to be used is set. Accordingly, it is possible to provide a hedge trimmer that can be applied to cutting work of different workpieces while maintaining the performance of the double-blade drive type blade device.

(Invention of Claim 3)
According to the invention described in claim 3, each of the double-blade drive type blade devices in the hedge trimmer according to claim 1 or 2 allows a pair of blades and a pair of blades to reciprocate in a facing manner. In this way, the unit structure has a guide plate for holding the blade, and is configured to be attached by fixing the guide plate to the main body . According to the invention of claim 3, each double-edged drive type blade device has a unit structure, whereby the replacement work for the main body can be easily performed.

(Invention of Claim 4)
According to the invention described in claim 4, in the hedge trimmer according to any one of claims 1 to 3, the first double-edged blade type blade device is a hedge blade used for hedge trimming work, A pair of blades are configured to perform branch and leaf cutting work by reciprocating linearly in opposite directions, and the second double-blade drive blade device is a lawn blade device used for lawn mowing work, The blade is reciprocally swung in a direction crossing the moving direction of the blade of the hedge blade device so as to perform the grass cutting operation. According to this configuration, the hedge trimming operation and the lawn trimming operation can be appropriately and selectively performed using one hedge trimmer.

  According to the present invention, a technique effective in reducing cams is provided in a hedge trimmer that can be applied to a plurality of different types of pruning operations.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The overall configuration of the hedge trimmer 100 according to the present embodiment is shown as a side sectional view in FIGS. 1, 2 and 5, and the configuration on the bottom (lower surface) side of the hedge trimmer 100 is shown in FIGS. . 1, 2, and 3 show a case where the hedge blade device 141 is attached to the hedge trimmer 100, and FIGS. 5 and 6 show a case where the grass blade device 151 is attached to the hedge trimmer 100. Yes. FIG. 2 shows a state when the eccentric cam 131 is rotated approximately 90 degrees from the state shown in FIG. FIG. 4 is a diagram for explaining an attachment position when the cam device 131 is used for hedge trimming work, and FIG. 7 is a diagram for explaining an attachment position when the cam device 131 is used for lawn trimming work. FIG. 8 is a view from the bottom side for explaining the cam device 131.

  The overall configuration of the hedge trimmer 100 according to the present embodiment will be described with reference to FIG. 1, FIG. 2, and FIG. The main body 101 of the hedge trimmer 100 is mainly composed of a housing 103 and a handle (hand grip) 105 disposed on the rear side (left side in FIGS. 1 and 2) of the housing 103. Housed in the housing 103 is an electric motor 111 and a rotary drive device 121 that decelerates the rotational output of the electric motor 111 and transmits it to the cam device 131. A cam device 131 is disposed below the rotation drive device 121. The cam device 131 has a double blade drive hedge blade device 141 (see FIGS. 1 to 3) or a grass blade device 151 (see FIG. 5). And FIG. 6) are configured to be selectively engaged. The hedge blade device 141 or lawn blade device 151 engaged with the cam device 131 has two blades 142, 143, 152, and 153 reciprocatingly moved opposite to each other based on the rotational drive of the cam device 131. Or it is set as the structure which performs the mowing work of a lawn. The hedge blade device 141 and the grass blade device 151 described above correspond to the “double blade drive blade device” in the present invention. The two blades 142, 143, 152, and 153 described above correspond to “a pair of blades” in the present invention.

  Next, details of each mechanism will be described. The electric motor 111 is arranged so that the rotation axis is in the vertical direction (vertical direction) with the output shaft 113 on the lower side, and a pinion 115 is formed at the tip (lower end) of the output shaft 113. The handle 105 is provided with a trigger 109 for operating a power switch 107 for energization driving of the electric motor 111.

  The rotary drive device 121 is meshed with and engaged with the pinion 115 of the output shaft 113, and is formed integrally with the intermediate large gear 123 that rotates in the horizontal plane with the first support shaft 122 as the rotation center. The intermediate small gear 124 and the intermediate small gear 124 are engaged with and engaged with each other, and the driven gear 126 that rotates around the second support shaft 125 in the horizontal plane is mainly configured. The first support shaft 122 and the second support shaft 125 are arranged in parallel with the output shaft 113 (the axis is in the vertical direction). Further, the lower side of the second support shaft 125 protrudes from the lower surface of the driven gear 126 by a predetermined length, and this protruding portion serves as a mounting shaft portion 127 of the cam device 131 described later. The driven gear 126 corresponds to the “rotating member” in the present invention.

As shown in FIGS. 4, 7 and 8, the cam device 131 includes three eccentric cams (disk cams) 133, 135, and 137 arranged so as to overlap each other in the vertical direction. The eccentric cams 133, 135, and 137 are joined together by two joining pins 139 and integrated. An upper eccentric cam 133 (shown on the farthest side in FIG. 8) located on the upper side (motor side) and an intermediate eccentric cam 135 located in the middle are provided for driving the hedge blade device 141. A cam 135 and a lower eccentric cam 137 located at the lower side (bottom side) (indicated by a circle with the smallest diameter on the foremost side in FIG. 8) are provided for driving the grass blade device 151.
That is, in the present embodiment, a triple cam is obtained by adding a third cam to either one of the upper and lower sides of the twin cam in the double-blade drive type hedge trimmer, and the intermediate eccentric cam 135 includes the hedge blade device 141 and the lawn. The blade device 151 is shared. Further, in the present embodiment, the upper eccentric cam 133 and the intermediate eccentric cam 135 are formed of disks having substantially the same outer diameter, while the lower eccentric cam 137 is formed in the hedge blade device 141 described later. The oblong holes 142b and 143b are formed of small-diameter discs through which the oblong holes 142b and 143b can pass. The upper eccentric cam 133 corresponds to the “first eccentric cam” in the present invention, the intermediate eccentric cam 135 corresponds to the “second eccentric cam” in the present invention, and the lower eccentric cam 137 corresponds to the “first eccentric cam” in the present invention. Corresponds to “3 eccentric cams”.

  As shown in FIG. 8, each of the eccentric cams 133, 135, and 137 is provided with a first mounting hole 134 for hedge trimming work and a second mounting hole 136 for lawn trimming work. The first mounting hole 134 is provided at an intermediate position on the straight line A connecting the center P1 of the upper eccentric cam 133 and the center P2 of the intermediate eccentric cam 135, that is, at the midpoint Q1 of the center-to-center distance. The second mounting hole 136 is provided at an intermediate position on the straight line A connecting the center P2 of the intermediate eccentric cam 135 and the center P3 of the lower eccentric cam 137, that is, at the midpoint Q2 of the center-to-center distance. Both the attachment holes 134 and 136 are circular holes set to have the same diameter, and are detachably fitted to the attachment shaft portion 127 of the second support shaft 125 in the rotary drive device 121 described above. That is, the mounting positions of the eccentric cams 133, 135, and 137 are displaced by fitting either the first mounting hole 134 or the second mounting hole 136 to the mounting shaft portion 127 of the second support shaft 125. The position when the first mounting hole 134 is fitted to the mounting shaft 127 corresponds to the “first position” in the present invention, and the position when the second mounting hole 134 is fitted. Corresponds to the “second position” in the present invention.

  When the first mounting hole 134 is fitted to the mounting shaft portion 127 of the second support shaft 125 (see FIG. 4), the center point Q1 that is the center of the first mounting hole 134 is the eccentric cams 133, 135, 137. The distance from the middle point Q1 to the center P1 of the upper eccentric cam 133 and the distance from the middle point Q1 to the center P2 of the intermediate eccentric cam 135 are the same amount of eccentricity E1. On the other hand, when the second mounting hole 136 is fitted to the mounting shaft portion 127 of the second support shaft 125 (see FIG. 7), the center point Q2 that is the center of the second mounting hole 136 is the eccentric cams 133, 135. , 137, and the distance from the middle point Q2 to the center P2 of the intermediate eccentric cam 135 and the distance from the middle point Q2 to the center P3 of the lower eccentric cam 137 are the same amount of eccentricity E2. The eccentric amount E2 set for the lawn is set to a value smaller than the eccentric amount E1 set for the hedge.

  As shown in FIG. 2, the three eccentric cams 133, 135, and 137 pass through the eccentric cams 133, 135, and 137 and are circumferentially connected by two joining pins 139 that are joined by brazing, for example. Are joined in a state where they are positioned. The two joining pins 139 protrude from the upper surface of the upper eccentric cam 133 by a predetermined length, and protrude when the eccentric cams 133, 135, and 137 are fitted to the mounting shaft portion 127 of the second support shaft 125. The portion is inserted into a positioning hole formed in the driven gear 126 so as to be loosely fitted, whereby the eccentric cams 133, 135, and 137 are set in a non-rotating state with respect to the driven gear 126. Thus, the three eccentric cams 133, 135, and 137 are configured to be horizontally rotated together with the driven gear 126 using the second support shaft 125 as a rotation fulcrum.

  Next, the configuration of the hedge blade device 141 used for the hedge cutting operation and the mounting structure of the hedge blade device 141 to the hedge trimmer 100 will be described with reference to FIGS. In this case, the eccentric cams 133, 135, and 137 are formed so that the first attachment hole 134 is attached to the attachment shaft of the second support shaft 125 in the rotary drive device 121 as shown in FIG. 4 in order to correspond to the use of the hedge blade device 141. The driven gear 126 is set in a state of being fitted to the portion 127.

  The hedge blade device 141 is formed in a substantially band plate shape in a plan view, and two upper and lower blades 142 and 143 arranged on the same horizontal axis so as to overlap each other, and the two blades 142 and 143. The unit structure is composed of two upper and lower guide plates 144 and 145 for sandwiching and holding the blades 142 and 143 from both sides so as to allow the blades 142 to reciprocate linearly. As shown in FIG. 3, the upper and lower blades 142 and 143 have comb-shaped cutting blades 142a and 143a in a region excluding the base side (the left side in the drawing). The upper and lower guide plates 144, 145 include a sleeve 146 interposed between the guide plates 144, 145, a guide plate 144, 145, a screw (bolt) 147 passing through the sleeve 146, and a nut 148 fastened to the screw 147. The sleeve 146 is slidably passed through the long holes 142c and 143c formed in the blades 142 and 143 extending in the moving direction. Thus, the upper and lower guide plates 144 and 145 are joined to each other in a form that allows the movement of the blades 142 and 143.

  The hedge blade device 141 is detachably attached to the base portion of the lower guide plate 145 with a mounting screw 149 with respect to the mounting portion 103a (see FIG. 3) formed on the lower surface side (bottom surface side) of the housing 103. It will be installed by fastening to. In this mounted state, the cutting edge side extends horizontally in front of the housing 103 (on the right side in FIGS. 1 to 3). In the bases of the upper and lower blades 142 and 143 (on the left side in FIGS. 1 and 2), oblong holes 142b and 143b (in the drawing) whose major axis is the left-right direction (the direction intersecting the moving direction of the blades 142 and 143), respectively. 3), the upper oblong hole 142b is engaged with the upper eccentric cam 133 and the lower oblong hole 143b is the intermediate eccentric cam in a state where the hedge blade device 141 is mounted on the housing 103. 135 is configured to be engaged. With this configuration, a so-called crank mechanism is configured, and the upper and lower eccentric cams 133 and 135 are rotated so that the upper and lower blades 142 and 143 perform horizontal linear reciprocating motion in an opposing manner (in reverse phase). The

  When the hedge blade device 141 is mounted as described above, the power switch 107 is turned on (turned on) by the pulling operation of the trigger 109, and when the electric motor 111 is energized and driven, the pinion 115 and the intermediate large gear 123 are turned on. The driven gear 123 is rotated in the horizontal plane via the intermediate small gear 124, and the eccentric cams 133, 135, and 137 of the cam device 131 are rotationally moved in the horizontal plane. Accordingly, the upper and lower blades 142 and 143 engaged with the upper eccentric cam 133 and the intermediate eccentric cam 135 perform a horizontal linear reciprocating motion in opposite directions (in opposite phases), and the cutting blade 142a of the upper blade 142 and the lower blade 142a. Cutting is performed with the branches and leaves as the object to be cut between the cutting blades 143a of the blade 143 on the side. At this time, as described above, the upper and lower blades 142 and 143 move with a moving amount twice as large as the eccentric amount E1 of the upper eccentric cam 133 and the intermediate eccentric cam 135.

  Next, the configuration of the lawn blade device 151 used for lawn mowing work and the mounting structure of the lawn blade device 151 to the hedge trimmer 100 will be described with reference to FIGS. In this case, the eccentric cams 133, 135, and 137 are formed so that the second mounting holes 136 are attached to the mounting shafts of the second support shafts 125 in the rotary drive device 121 as shown in FIG. The driven gear 126 is set in a state of being fitted to the portion 127.

  The lawn blade device 151 is formed in a substantially T shape in plan view and is disposed on the lower surface (bottom surface) side of the upper and lower blades 152 and 153 disposed so as to overlap each other and the lower blade 153. The guide plate 154 has a unit structure in which the blades 152 and 153 and the guide plate 154 are connected to each other by a single connecting pin 155 so as to be relatively rotatable in a horizontal plane. As shown in FIG. 6, the upper and lower blades 152 and 153 have comb-shaped cutting blades 152a and 153a on the tip side.

  The lawn blade device 151 has a mounting screw 149 (growth blade device) through a resin under cover 156 on the base side with respect to the mounting portion 103a (see FIG. 6) formed on the lower surface side (bottom surface side) of the housing 103. 141 is attached by detachably fastening with a mounting screw 149) used for mounting 141. On the base side of the upper and lower blades 152, 153, oblong holes 152b, 153b are formed with the longitudinal direction as the major axis direction (the direction intersecting the moving direction of the blades 152, 153), respectively. The oval hole 152b of the upper blade 152 is dimensioned to engage the intermediate eccentric cam 135, and the oval hole 153b of the lower blade 153 is dimensioned to engage the lower eccentric cam 137 (thus, the upper The blade 152 is smaller than the oblong hole 152b). That is, when the lawn blade device 151 is used, the oblong hole 152b of the upper blade 152 is engaged with the intermediate eccentric cam 135, and the oblong hole 153b of the lower blade 153 is engaged with the lower eccentric cam 137. Is done. With this configuration, a so-called crank mechanism is formed, and the upper and lower blades 152, 153 are horizontally opposed to each other (in reverse phase) in a circular arc shape around the connecting pin 155 as the intermediate and lower eccentric cams 135, 137 rotate horizontally. The swinging reciprocating motion is performed.

  When the lawn blade device 151 is used, a gap is generated between the lower surface of the housing 103 and the upper surface of the lawn blade device 151 because the two lower-side eccentric cams 135 and 137 are used. Therefore, in the present embodiment, a spacer 158 (see FIG. 5) is interposed between the lower surface of the housing 107 and the upper surface of the under cover 156 to prevent the housing 107 from dust.

  When the lawn blade device 151 is mounted as described above, the power switch 107 is turned on (turned on) by the pulling operation of the trigger 109, and when the electric motor 111 is energized and driven, the pinion 115 and the intermediate large gear 123 are turned on. The driven gear 126 is rotated in the horizontal plane via the intermediate small gear 124, and the eccentric cams 133, 135, and 137 of the cam device 131 are rotationally moved in the horizontal plane. Accordingly, the upper and lower blades 152 and 153 engaged with the intermediate eccentric cam 135 and the lower eccentric cam 137 perform horizontal swinging reciprocating motions in opposite directions (in opposite phases) with the connecting pin 155 as the rotation center, The cutting blade 152a of the blade 152 and the cutting blade 153a of the lower blade 153 are cut by sandwiching grass as an object to be cut. At this time, the base side of the upper and lower blades 152, 153 is swung with a moving amount twice the eccentric amount E2 of the intermediate eccentric cam 135 and the lower eccentric cam 137, and the cutting blade side is connected with the connecting pin 155 and the eccentric cam 133, The movement amount is determined by the ratio between the distance to the rotation center of 135 and 137 and the distance from the connecting pin 155 to the cutting blades 152a and 153a.

  As described above, in the present embodiment, by exchanging the hedge blade device 141 and the lawn blade device 151, in the double-edge drive type hedge trimmer 100 that can be used for the hedge trimming operation and the lawn trimming operation, The lower three eccentric cams 133, 135, and 137 constitute the cam device 131, the mounting positions of the eccentric cams 133, 135, and 137 with respect to the driven gear 126 can be displaced, and the three eccentric cams. Of the 133, 135, and 137, the intermediate eccentric cam 135 is shared by both the hedge blade and the lawn blade 141 and 151. As a result, the number of cams can be reduced as compared with a conventional hedge trimmer that includes a blade unit structure including an eccentric cam. As a result, the hedge trimmer 100 effective in simplifying the structure, reducing the cost, or reducing the weight is provided.

  Further, by adopting a method of changing the mounting positions of the eccentric cams 133, 135, and 137, an eccentric amount E1 suitable for hedges and an eccentric amount E2 suitable for grasses are ensured, respectively, and the hedge blade device 141 and the grass blades are secured. A suitable moving amount (displacement amount) can be given to each of the devices 151. For this reason, two different pruning operations for hedges and lawns can be efficiently performed while maintaining the same performance as that of the dedicated machine.

  In addition, according to the present embodiment, the design of the cam device 131 can be mainly changed to provide the hedge trimmer 100 that can be applied to two types of trimming operations different from the hedge and the lawn. The hedge trimmer 100 for both hedge and lawn can be easily manufactured based on the hedge trimmer designed for use. Both the hedge blade device 141 and the lawn blade device 151 have a unit structure and can be easily replaced. For this reason, the change from the hedge trimming work to the lawn mowing work or the change from the lawn mowing work to the hedge trimming work can be easily performed by exchanging the blades 141 and 151 and converting the mounting position of the cam device 131. And user convenience is not reduced.

In the present embodiment, the three eccentric cams 133, 135, and 137 are joined together by a joining pin 139 to be integrated, and the whole is fitted to the attachment shaft portion 127 of the second support shaft 125, so that the attachment position is obtained. Of the three eccentric cams 133, 135, and 137, at least if the mounting position of the intermediate eccentric cam 135 shared for driving the hedge blade device 141 and the lawn blade device 151 is displaced. The invention is valid.
In this embodiment, the three eccentric cams 133, 135, and 137 are joined by the joining pin 139. However, the eccentric cams 133, 135, and 137 may be integrally formed by processing one material. . The eccentric cams 133, 135, and 137 may be attached to the driven gear 126 using screws. Further, the hedge blade device 141 and the grass blade device 151 do not have to have a unit structure.

It is a sectional side view which shows the whole structure of the hedge trimmer which concerns on this Embodiment, and shows the case where the blade apparatus for hedges is mounted | worn. Similarly, it is a sectional side view of the hedge trimmer, and shows a state where the cam device is rotated approximately 90 degrees from the state shown in FIG. It is a partially cut bottom view of the hedge trimmer with the hedge blade device attached. It is a figure explaining the attachment of the cam apparatus in the case of using for a hedge cutting operation. It is a sectional side view of the hedge trimmer in the state where the blade device for lawn is mounted. It is a partially cut bottom view of the hedge trimmer in a state where the blade device for lawn is mounted. It is a figure explaining attachment of the cam apparatus in the case of using it for the lawn mowing work. It is the figure seen from the bottom face side for demonstrating a cam apparatus.

DESCRIPTION OF SYMBOLS 100 Hedge trimmer 101 Main part 103 Housing 105 Handle 107 Power switch 109 Trigger 111 Electric motor 113 Output shaft 115 Pinion 121 Rotation drive device 122 First support shaft 123 Intermediate large gear 124 Intermediate small gear 125 Second support shaft 126 Driven gear (rotation Element)
127 Mounting shaft 131 Cam device 133 Upper eccentric cam (first cam)
134 First mounting hole (first position)
135 Intermediate eccentric cam (second cam)
136 Second mounting hole (second position)
137 Lower eccentric cam (third cam)
139 Joining Pin 141 Hedge Blade Device (Double Blade Drive Blade Device)
142, 143 Upper and lower blades (a pair of blades)
142a, 143a Cutting blades 142b, 143b Oval holes 144, 145 Guide plate 146 Sleeve 147 Screw 148 Nut 149 Mounting screw 151 Grass blade device (double blade drive blade device)
152,153 Upper and lower blades (a pair of blades)
152a, 153a Cutting blades 152b, 153b Oval hole 154 Guide plate 155 Connecting pin 156 Under cover

Claims (4)

A main body for accommodating the rotation drive device;
At least first, second and third cams mounted on a rotating member of the rotary drive device;
A hedge trimmer having at least first and second types of double-edged blade devices that are selectively detachable from the main body,
Each of the first and second double-blade drive type blade devices is connected to two of the cams when mounted on the main body, and reciprocates in an opposing manner based on the rotation of the cams. It has a pair of blades that perform the cutting work of the cut object,
In a state where the first double-blade drive type blade device is mounted on the main body, the pair of blades of the first double-blade drive type blade device is connected to the first and second cams ,
In a state where the second double-blade drive blade device is mounted on the main body, the pair of blades of the second double-blade drive blade device are connected to the second and third cams ,
When the first double-blade drive type blade device is mounted on the main body, the second cam is connected to the first cam with respect to a pair of blades of the first double-blade drive type blade device. When the second double-blade drive blade device is mounted on the main body portion and is disposed at the first position that gives the same movement amount, the pair of blades of the second double-blade drive blade device is The mounting position relative to the rotating member is displaceable between the first position and the second position so as to be disposed at a second position that gives the same amount of movement as the third cam. Hedge trimmer characterized by. The hedge trimmer according to claim 1,
The first and second cams are set so that the midpoint of the line connecting the centers of the two cams is the center of rotation when the second cam is mounted at the first position. The second and third cams are set so that the midpoint of the line connecting the centers of the two cams is the center of rotation when the second cam is mounted at the second position. Hedge trimmer characterized by The hedge trimmer according to claim 1 or 2,
Each of the double-blade drive type blade devices has a unit structure including a pair of blades and a guide plate that holds the blades so as to allow the pair of blades to reciprocate in a facing manner. A hedge trimmer, which is mounted by fastening the guide plate to a portion . The hedge trimmer according to any one of claims 1 to 3,
The first double-blade drive blade device is a hedge blade device used for hedge trimming work, and is configured to perform branch and leaf cutting work by a pair of blades reciprocating linearly reciprocally. The second double-blade driven blade device is a lawn blade device used for lawn mowing work, and a pair of blades reciprocally swing in a direction crossing the moving direction of the blade of the hedge blade device. A hedge trimmer characterized in that it is configured to perform turf cutting work by moving dynamically.

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