JPH10191810A - Power pruning saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-efficiency and sharp power pruning saw in which the longitudinal stroke of saw blade of power pruning saw is enlarged and by which sawn chips are satisfactorily removed. SOLUTION: In this power pruning saw, a main shaft 3 to be suitably rotationally driven by a rotary prime mover such as an engine or an electric motor is provided with driving eccentric cams 4 and 5 to be vertically and longitudinally displaced eccentrically, two upper and lower driven cam bodies 6 and 7 to be reciprocatively operated while being symmetrically deviated back and forth by receiving the rotations of these respective driving eccentric cams 4 and 5 are mounted inside a transmission case 1 bearing the main shaft 3 while being sandwiched from the upper and lower sides, the fore side sections of fore and rear reciprocative operating members 61 and 71 integrated with these upper and lower driven cam bodies 6 and 7 themselves or suitably attached to these upper and lower cam bodies 6 and 7 are protruded outside the fore side of transmission case 1, a saw blade 12 is fixed on any one side of fore and rear reciprocative operating members 61 and 71 and a handy working member is mounted on the other side.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【産業上の利用分野】この発明は、林業において、優良
材を生産するための枝打ち作業に使用される動力枝打鋸
機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power pruning saw used in a pruning operation for producing high quality wood in the forestry industry.

【従来技術】従来から使用されている動力枝打鋸機は、
エンジン或は電動モータで駆動される単一のクランク機
構或は単一のカム機構を内装した伝動ケースの外側に、
このクランク機構或はカム機構に連繋された一枚の往復
作動部材を突出させ、この往復作動部材に鋸刃を取り付
け、伝動ケース側に手持ち用の作業部材を取り付けた構
成であり、単に、一個のクランク機構或はカム機構で鋸
刃が前後に往復作動される動力枝打鋸機であった。2. Description of the Related Art Conventionally used power pruning saws are:
On the outside of the transmission case containing a single crank mechanism or a single cam mechanism driven by an engine or an electric motor,
A single reciprocating member connected to the crank mechanism or the cam mechanism is protruded, a saw blade is attached to the reciprocating member, and a hand-held working member is attached to the transmission case side. Is a power pruning saw in which the saw blade is reciprocated back and forth by the crank mechanism or the cam mechanism.

【発明が解決しようとする課題】前述の従来型動力枝打
鋸機は、一枚の往復作動部材に鋸刃が取り付けられた構
成であったために、該鋸刃の往復作動のストロークが小
さく鋸屑の捌けが悪く、結果的に鋸の切れ味がわるくて
能率があがらない欠点があった。Since the conventional power pruning saw described above has a structure in which a saw blade is attached to one reciprocating member, the stroke of the reciprocating operation of the saw blade is small and the sawdust is small. Has a drawback that the saw is not easily handled, and as a result, the sharpness of the saw is poor and the efficiency is not improved.

【課題を解決するための手段】この発明は、前記の課題
解決のために、エンジン或は電動モータ等の回転式の原
動機２により適宜回転駆動される主軸３に上下に変位す
ると共に前後に偏心する駆動偏心カム４，５を設け、こ
の各駆動偏心カム４，５の回転を受けて前後に対称状態
にずれながら往復作動される上下２枚の従動カム体６，
７を前記主軸３を軸受けした伝動ケース１内に上下側か
ら挾み込む形態にして内装し、この上下の従動カム体
６，７自体に一体型或はこの上下のカム体６，７に適宜
取り付けられた前後往復作動部材６１，７１の前側部分
を前記伝動ケース１の前側外方に突出し、前後往復作動
部材の何れか片方側に鋸刃１２を固着し、他方側に手持
ち用の作業部材１５を装着してなる動力枝打鋸機とし
た。In order to solve the above-mentioned problems, the present invention displaces up and down a main shaft 3 appropriately rotated by a rotary motor 2 such as an engine or an electric motor and eccentrically moves back and forth. Driven eccentric cams 4 and 5 are provided.
The upper and lower driven cams 6 and 7 are integrated with the upper and lower driven cams 6 and 7 or are mounted on the upper and lower cams 6 and 7 as appropriate. The front portions of the attached front and rear reciprocating members 61 and 71 protrude outward from the front side of the transmission case 1, the saw blade 12 is fixed to one of the front and rear reciprocating members, and the other hand member is a working member for hand holding. No. 15 was attached to the power pruning saw.

【実施例】この発明の一実施例を図面に基づき詳細に説
明する。１は伝動ケースで、上ケース１ａと下ケース１
ｂとを上下に重ね合わせてボルトで締結した割型ケース
に構成され、エンジン又は電動モータ等の原動機２の動
力取り出し位置部に一体状になるよう取り付けられてお
り、そのケースの上下方向の厚みが薄型に形成されて内
部を中空状に構成し、その左右中間部の前側と後側には
前後方向に開口する嵌合部（イ）、（ロ）を形成してい
る。３は主軸で、前記原動機２の駆動軸側の回転ギヤー
（図示せず）に噛み合う従動ギヤー３ａを楔着してあ
り、その上下軸端を前記伝動ケース１にベアリングを介
して軸受ならしめ、原動機２で伝動回転される。４，５
は駆動偏心カムで、適宜厚みの真円状円盤からなり、こ
の両カムは上下側に位置がずれた状態にあって、互いに
前後対称状にその中心が夫々偏心して一部分が上下に重
合し、この重合した偏心位置に前記主軸３が上側と下側
に突出した格好で一体的に設けられ、該主軸３の回転に
より上側に位置した駆動偏心カム４と下側に位置した駆
動偏心カム５とが前後に対称状にずれながら伝動回転さ
れるよう構成されている。６，７は従動カム体で、前記
上側駆動偏心カム４の少なくとも前後側が係合するカム
壁ａ，ｂを形成した従動カム体６及び前記駆動偏心カム
５の少なくとも前後側が係合するカム壁ｃ，ｄを形成し
た従動カム体７からなり、この２枚の従動カム体６，７
が互いに上下に重合して摺動自由に設けられており、前
記伝動ケース１の前側と後側では該従動カム体６，７に
一体型あるいは別例の第６図及び第７図で示したカム体
６，７に係合連結される前後往復作動部材６１，７１が
上下重合状態で自由に前後に摺動規制されるよう前記嵌
合部（イ）、（ロ）に嵌着された支持メタル８，９で受
けられている。１０，１１は前記従動カム体６，７に穿
設された長孔で、前記主軸３が貫通されている。１２は
鋸刃で、前後に延びる薄板の左右側あるいは一側に鋸状
の刃を形成した通常の枝打鋸刃であり、この鋸刃１２に
基端側を前記上側の従動カム体６に一体の前後往復作動
部材６１にネジ１３とナット１４とで固着している。
尚、図例とは別に、鋸刃１２は下側の前後往復作動部材
７１に固着してもよく何れか一方側に取り付けるとよ
い。そして、この鋸刃１２を取り付けない下側の前後往
復作動部材７１を手で掴んで固定すると、この前後作動
部材７１の前後動が止められるためにその動力が伝動ケ
ース１側に伝えられることになり、相対的に原動機２及
び伝動ケース１側が前後に往復作動する。このため、上
側の従動カム体６に一体状の前後作動部材６１が２倍の
偏心寸法前後に動くことになり、したがって鋸刃１２が
偏心カムの偏心寸法の倍の寸法で前後に往復作動される
ことになる。この原理から、前記下側従動カム体７に一
体的あるいは別体係合した前後作動部材７１側に手持ち
用の作業部材１５を設け、この作業部材１５を掴んで鋸
刃１２を除去しようとする枝に接当して押し付けると枝
打ちができる。図例の作業部材１５は、前記従動カム体
７に一体状あるいは別体で連係させた前後作動部材７１
に固着して一体状にした取付部材１６を先端側に、作業
ハンドル１８を基端側に固着した作業棒１７から構成さ
れ、この作業ハンドル１８には前記原動機２の始動等を
操作をする操作部材１９が設けられている。即ち、原動
機がエンジンである場合にはスロットルレバーとしての
操作部材等であり、電動モータである場合には始動、停
止用のスイッチ操作部材である。尚、図中記号の２０，
２１は原動機２が電動モータである場合の電線を示す。
２２は枝支え捧で、前記取付部材１６にネジ２６で固着
された金具２３に前後中間部が前後移動自在に支持さ
れ、その先端側をく字型に屈曲させて枝Ａが係合される
よう構成し、また、この枝支え棒２２の基部側にはスト
ッパー２４を取付けて前記金具２３との間にスプリング
２５を介在し、先端側のく字型の枝引っ掛部分が常時鋸
刃１２側から離れるよう構成し、く字型の枝引っ掛部分
に枝Ａを引っ掛けた状態で該スプリング２５に抗して作
業部材１５を引くとき、枝Ａが鋸刃１２に接当するよう
になっている。上例の作用について説明すると、作業ハ
ンドル１８を掴んで原動機２を始動すると、ギヤー伝動
等により主軸３が伝動回転される。したがって、この主
軸３に楔着されている駆動偏心カム４，５が回転され、
このカム４，５を前後で係合する従動カム体６，７のカ
ム壁ａ，ｂ，ｃ，ｄが前記駆動偏心カム４，５の回転外
周面で押し引きされ、従動カム体６，７が前後に往復作
動する。このため、この従動カム体６，７の前側に一体
的に構成されて伝動ケース１の前側に突出する上下２枚
の前後作動部材６１，７１が前後に相対的に往復作動さ
れる。尚、第６図及び第７図の別実施例では、従動カム
体６，７に係合連繋する前後作動部材６１，７１が伝動
ケース１の前側に突出して同じように前後に相対的に往
復作動される。そして、この前後作動部材６１側に固着
された鋸刃１２がこの作動部材６１の前後往復作動に伴
い同じく前後作動される。然るに、下側の前後作動部材
７１は同じく駆動偏心カム５、従動カム体７を介して前
後に往復動されようとするが、この従動カム体７側に固
着あるいは連繋されている前記前後作動部材７１側が作
業部材１５に取り付けられており、この作業部材１５側
の作業ハンドル１８が作業者により掴まれているため
に、前後作動部材７１を往復作動させる動力が原動機２
側に伝わり、このために伝動ケース１自体が前後に往復
作動される。したがって、鋸刃１２がこの伝動ケース１
側の動力を吸収して、この鋸刃１２を直接的に作動させ
る前後往復作動ストロークに伝動ケース１側の前後往復
作動ストロークが加算され、鋸刃１２の前後往復作動ス
トロークが大きくなる。したがって、枝打ち作業をする
場合には、除去しようとする枝Ａの付け根部分に、枝支
え棒２２のく字型部を引っ掛けて作業部材１５を作業ハ
ンドル１８側で引くとき、スプリング２５が圧縮して枝
Ａが鋸刃１２に接当し、更に、強く引くと枝Ａが鋸刃１
２で切断される。このとき、鋸刃１２の往復ストローク
が大きいために鋸肩の捌けが極めてよく、鋸の切れ味が
非常によくなり高能率な枝打ち作業ができる。尚、前述
の実施例では作業部材１５を大きくして地上等から高い
位置の枝Ａを切断する場合の構成としたが、作業者近傍
の枝Ａを切断するような場合には、第８図の通り、作業
棒１７ａを側面視Ｕ字型にして短くし、手前側に突出さ
せた左手ハンドル１８ａと右手ハンドル１８ｂを設け
て、両手で動力枝打鋸機が支える構成にすれば枝打ち作
業だけでなく小さな木を伐採することが可能になる。An embodiment of the present invention will be described in detail with reference to the drawings. Reference numeral 1 denotes a transmission case, which includes an upper case 1a and a lower case 1
b and a split case in which the upper and lower parts are overlapped with each other and fastened with bolts, and attached integrally to the power take-out position of the prime mover 2 such as an engine or an electric motor, and the thickness of the case in the vertical direction. Are formed to be thin and have a hollow interior, and fitting portions (a) and (b) which open in the front-rear direction are formed on the front side and the rear side of the left and right intermediate portions. Reference numeral 3 denotes a main shaft, which is wedge-fitted with a driven gear 3a that meshes with a rotary gear (not shown) on the drive shaft side of the prime mover 2, and whose upper and lower shaft ends are fitted to the transmission case 1 via bearings. It is driven and rotated by the prime mover 2. 4,5
Is a drive eccentric cam, consisting of a perfect circular disk of appropriate thickness, these two cams are displaced in the vertical direction, their centers are eccentric in front and rear symmetrical to each other, and a part is vertically overlapped, The main shaft 3 is integrally provided at the overlapped eccentric position in such a manner that the main shaft 3 protrudes upward and downward, and the rotation of the main shaft 3 causes the drive eccentric cam 4 positioned above and the drive eccentric cam 5 positioned below and Are driven and rotated while being shifted symmetrically back and forth. Reference numerals 6 and 7 denote a driven cam body, which is a driven cam body 6 having cam walls a and b with which at least the front and rear sides of the upper drive eccentric cam 4 are engaged, and a cam wall c with which at least the front and rear sides of the drive eccentric cam 5 are engaged. , D are formed, and the two driven cam bodies 6, 7
6 and 7 are provided on the front and rear sides of the transmission case 1 so as to be freely slidable. The front and rear sides of the transmission case 1 are integrated with the driven cam bodies 6 and 7 or shown in FIGS. 6 and 7 of another example. Supports fitted to the fitting portions (a) and (b) so that the front-rear reciprocating members 61 and 71 engaged and connected to the cam bodies 6 and 7 are freely slidably controlled back and forth in a vertically overlapped state. Received in Metals 8 and 9. Reference numerals 10 and 11 denote elongate holes formed in the driven cam bodies 6 and 7, through which the main shaft 3 passes. Reference numeral 12 denotes a saw blade, which is a normal pruning saw blade having a saw-like blade formed on the left or right side or one side of a thin plate extending in the front-rear direction. The screw 13 and the nut 14 are fixed to the integral front and rear reciprocating member 61.
It should be noted that, apart from the example shown in the figures, the saw blade 12 may be fixed to the lower front-rear reciprocating member 71, or may be attached to either one side. When the lower back-and-forth reciprocating member 71 to which the saw blade 12 is not attached is grasped by hand and fixed, the fore-and-aft operation member 71 is stopped from moving back and forth, so that its power is transmitted to the transmission case 1 side. Thus, the prime mover 2 and the transmission case 1 reciprocate relatively back and forth. For this reason, the front-back operating member 61 integral with the upper driven cam body 6 moves back and forth twice the eccentric dimension, and the saw blade 12 is reciprocated back and forth at twice the eccentric dimension of the eccentric cam. Will be. According to this principle, a work member 15 for hand-holding is provided on the side of the front-rear operation member 71 integrally or separately engaged with the lower driven cam body 7, and the saw blade 12 is to be removed by grasping the work member 15. Pruning can be achieved by pressing against a branch. The working member 15 in the illustrated example is a front-rear operating member 71 integrally or separately linked to the driven cam body 7.
A work member 17 is fixed to the distal end side of the mounting member 16 and fixed to the base, and a work rod 17 is fixed to the base end side of the work handle 18. A member 19 is provided. That is, when the prime mover is an engine, it is an operating member as a throttle lever, and when it is an electric motor, it is a switch operating member for starting and stopping. Incidentally, the symbol 20,
Reference numeral 21 denotes an electric wire when the prime mover 2 is an electric motor.
Reference numeral 22 denotes a branch support, and a front and rear intermediate portion is supported by a bracket 23 fixed to the mounting member 16 with a screw 26 so as to be movable in the front and rear direction. A stopper 24 is mounted on the base side of the branch support rod 22 and a spring 25 is interposed between the bracket 23 and the bracket 23. The branch A comes into contact with the saw blade 12 when the work member 15 is pulled against the spring 25 in a state where the branch A is hooked on the U-shaped branch hook portion. ing. Explaining the operation of the above example, when the prime mover 2 is started by gripping the work handle 18, the main shaft 3 is driven and rotated by gear transmission or the like. Therefore, the drive eccentric cams 4, 5 wedge-fitted to the main shaft 3 are rotated,
The cam walls a, b, c, d of the driven cams 6, 7, which engage the front and rear cams 4, 5, are pushed and pulled on the rotation outer peripheral surfaces of the drive eccentric cams 4, 5, and the driven cams 6, 7 are driven. Reciprocates back and forth. Therefore, the upper and lower front and rear operation members 61 and 71 integrally formed on the front sides of the driven cam bodies 6 and 7 and protruding toward the front side of the transmission case 1 are relatively reciprocated back and forth. 6 and 7, the front and rear operation members 61 and 71 engaged with and connected to the driven cam bodies 6 and 7 protrude to the front side of the transmission case 1 and similarly reciprocate back and forth. Activated. Then, the saw blade 12 fixed to the front-back operation member 61 is also operated back-and-forth as the operation member 61 reciprocates back and forth. However, the lower front-rear operation member 71 also tends to reciprocate back and forth via the drive eccentric cam 5 and the driven cam body 7, but the front-rear operation member fixed or connected to the driven cam body 7 side. Since the side 71 is attached to the working member 15 and the working handle 18 on the side of the working member 15 is gripped by the operator, the power for reciprocating the front-back operating member 71 is generated by the motor 2.
The transmission case 1 itself is reciprocated back and forth. Therefore, the saw blade 12 is mounted on the transmission case 1
The power stroke of the transmission case 1 is added to the front-rear reciprocating operation stroke for directly operating the saw blade 12 by absorbing the power on the side, and the reciprocating operation stroke of the saw blade 12 is increased. Therefore, when performing the pruning operation, the spring 25 is compressed when the work member 15 is pulled on the work handle 18 side by hooking the square portion of the branch support rod 22 at the base of the branch A to be removed. The branch A contacts the saw blade 12, and when it is further strongly pulled, the branch A
Cut at 2. At this time, since the reciprocating stroke of the saw blade 12 is large, the saw shoulder can be separated very well, the sharpness of the saw is extremely improved, and a highly efficient pruning operation can be performed. In the above-described embodiment, the working member 15 is enlarged to cut the branch A at a higher position from the ground or the like. However, when the branch A near the worker is cut, FIG. As shown in the figure, the working rod 17a is shortened in a U-shape when viewed from the side, and a left-hand handle 18a and a right-hand handle 18b protruding toward the near side are provided. Instead of cutting small trees.

【発明の効果】この発明によると、上下に変位させると
共に、前後に対称的に偏心した２枚の駆動偏心カムによ
り格別に前後に相対的に駆動される上下の従動カム体に
よる一方側の駆動力で鋸刃を駆動し、他方側の駆動力を
作業部材を介して作業者が手で掴んでその駆動力を殺す
ことで伝動ケースに伝え、この伝動ケースを介して同じ
く鋸刃側に伝えて当該鋸刃の前後作動ストロークを大き
くしたことにより、枝打ち作業時の鋸屑の捌けを良好に
し、切れ味の良い動力枝打鋸機を構成でき高能率な枝打
ち作業を可能にする作用効果を奏する。According to the present invention, one side driving by the upper and lower driven cam members which are vertically displaced and are relatively driven back and forth by two driving eccentric cams eccentrically symmetrically eccentric in the front and back. The saw blade is driven by force, and the driving force on the other side is transmitted to the transmission case by the operator grasping it by hand through the work member and killing the driving force, and also transmitted to the saw blade side via this transmission case. By increasing the front and rear operation strokes of the saw blade, it is possible to improve the handling of sawdust during the pruning operation, and to configure a sharp-cutting power pruning machine, which has an effect of enabling a highly efficient pruning operation.

【図面の簡単な説明】[Brief description of the drawings]

【図１】側面図FIG. 1 is a side view

【図２】要部の側面図FIG. 2 is a side view of a main part.

【図３】要部の平断面図FIG. 3 is a plan sectional view of a main part.

【図４】要部の側面図FIG. 4 is a side view of a main part.

【図５】伝動ケースを分解した要部の側面図FIG. 5 is a side view of a main part of the disassembled transmission case.

【図６】別例の要部の平断面図FIG. 6 is a cross-sectional plan view of a main part of another example.

【図７】第６図における伝動ケースを分解した要部の側
断面図FIG. 7 is a side sectional view of a main part of the transmission case in FIG. 6 disassembled.

【図８】別例の要部の側面図FIG. 8 is a side view of a main part of another example.

【符号の説明】[Explanation of symbols]

１ 伝動ケース ２ 原動機 ３ 主軸 ４ 駆動偏心カム ５ 駆動偏心カム ６ 従動カム体 ７ 従動カム体 ６１ 前後往復作動部材 ７１ 前後往復作動部材 １２ 鋸刃 １５ 作業部材 REFERENCE SIGNS LIST 1 transmission case 2 prime mover 3 main shaft 4 drive eccentric cam 5 drive eccentric cam 6 driven cam body 7 driven cam body 61 back and forth reciprocating member 71 back and forth reciprocating member 12 saw blade 15 working member

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 エンジン或は電動モータ等の回転式の原
動機２により適宜回転駆動される主軸３に上下に変位す
ると共に前後に偏心する駆動偏心カム４，５を設け、こ
の各駆動偏心カム４，５の回転を受けて前後に対称状態
にずれながら往復作動される上下２枚の従動カム体６，
７を前記主軸３を軸受けした伝動ケース１内に上下側か
ら挾み込む形態にして内装し、この上下の従動カム体
６，７自体に一体型或はこの上下のカム体６，７に適宜
取り付けられた前後往復作動部材６１，７１の前側部分
を前記伝動ケース１の前側外方に突出し、前後往復作動
部材の何れか片方側に鋸刃１２を固着し、他方側に手持
ち用の作業部材１５を装着してなる動力枝打鋸機。An eccentric cam (4, 5) which is vertically displaced and eccentric to the front and rear is provided on a main shaft (3) appropriately rotated and driven by a rotary motor (2) such as an engine or an electric motor. The upper and lower driven cams 6, which are reciprocated while being shifted symmetrically back and forth in response to the rotation of
The upper and lower driven cams 6 and 7 are integrated with the upper and lower driven cams 6 and 7 or are mounted on the upper and lower cams 6 and 7 as appropriate. The front portions of the attached front and rear reciprocating members 61 and 71 protrude outward from the front side of the transmission case 1, the saw blade 12 is fixed to one of the front and rear reciprocating members, and the other hand member is a working member for hand holding. A power pruning saw equipped with 15.