JPH0639946Y2 - Engine cutter - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to improvement of an engine cutter used for concrete cutting work, and more specifically, to a tension adjusting mechanism of a drive belt in the engine cutter. It is about.

[Prior art and problems to be solved]

BACKGROUND ART Conventionally, an engine cutter that drives a cutter blade of a cutter unit with an engine to cut concrete has been widely used because it is small and easy to handle.

In this type of engine cutter, as shown in FIG. 4, the mounting bolt 3 of the device body 1 equipped with the engine is inserted into the long hole 9 of the arm member 7 attached to the cutter unit 5, and this arm member is inserted. Since 5 is tightened with the fixing nut 11, it is necessary to adjust the belt tension (belt tension) at the time of manufacturing and assembling, when the cutter unit 5 is reversed and when the V belt 13 is replaced.

By the way, when adjusting the belt tension, the lead screw mechanism 17 is provided inside the side case 15 of the device body 1.
Is arranged and the cutout 19 of the arm member 7 is engaged with the adjusting pin 21 of the feed screw mechanism 17 to rotate the cutter unit 5 along the long hole 9 so as to move the cutter unit 5 properly. There is a problem that the adjustment work is troublesome because the rotation operation of the screw mechanism is troublesome.

[Means for solving problems]

Therefore, in this invention, a holder plate having a predetermined shape is inserted between the arm member and the fixed nut, and an eccentric cam is rotatably disposed on the outer surface of the arm member, and the eccentric cam is attached to the edge portion of the holder plate. The adjustment work by adopting a configuration that adjusts the axial distance between the output shaft of the engine and the rotation shaft of the cutter unit, that is, the belt tension by utilizing the eccentric action accompanying the rotation of the eccentric cam. It is a function that can be easily performed.

In this case, if the holder plate is integrally formed with the side case of the device body, the adjustment work can be performed more easily, which is preferable.

[Action]

In the engine cutter according to the present invention, the position of the arm member with respect to the device body is adjusted by appropriately rotating the eccentric cam that is engaged with the edge portion of the guide plate, and then the arm member is fixed with the fixing nut via the holder plate. By tightening, the belt tension is adjusted.

〔Example〕

A preferred embodiment of the engine cutter according to the present invention will be described in detail below with reference to the accompanying drawings. In addition,
In order to simplify the description, the same reference numerals will be used for the same constituent members as in the conventional example of FIG.

That is, in FIG. 1 and FIG. 2, the engine cutter according to the present invention is the output shaft 30 of the engine of the device body 1.
Drive pulley 34 mounted on the centrifugal clutch mechanism 32
And a V-belt 13 is wound around a driven pulley 38 provided coaxially with the cutter blade 36 of the cutter unit 5, and the center of the V groove of these pulleys 34 and 38 and the center of the arm member 7 are on the same line A. Set above and cutter unit 5
Is configured so that it can be used even if it is inverted as shown by a dotted line.

A holder plate 40 is disposed between the arm member 7 inserted into the mounting bolt 3 of the device body 1 through the elongated hole 9 and the fixed nut 11 for tightening the arm member 7.

On the other hand, a rotation operation shaft 42 is provided at a predetermined position outside the arm member 7, an eccentric cam 44 is fixed to the rotation operation shaft 42, and the eccentric cam 44 is engaged with the edge portion 40a of the holder plate 40. Deploy.

Further, a belt cover 48 is attached to the cutter unit 5 via a stopper 46, and a mounting portion 50 and an adjusting hole for a tension meter (not shown) used when adjusting the belt tension are attached to the belt cover 48. 52 are provided.

The side case 15 is fixed to the mounting portion 54 provided at the end of the holder plate 40 by an appropriate stopper.

Next, the adjustment of the belt tension in the engine cutter according to the present invention constructed as above will be described.

First, a tension meter (not shown) is set on the mounting portion 50 of the belt cover 48, and while watching the V-belt 13 from the adjustment hole 52, push the tension-meter push pin until the V-belt 13 touches the arm member 7, thereby tensioning the belt. Check the strength of.

Next, from the mounting portion 54 of the holder plate 40 to the side case
After removing 15, the fixing nut 11 is loosened so that the arm member 7 can move along the elongated hole 9. Then, the rotary operation shaft 42 is rotated by an appropriate jig to press the edge portion 40a of the holder plate 40 with the eccentric cam 44, and the fixing nut 11 is temporarily tightened when the V-belt 13 is appropriately stretched. In this case, since the eccentric cam 44 only needs to be rotated up to 180 degrees, the belt tension can be set quickly and easily.

Next, the tension of the V-belt 13 is examined, and if the tension is acceptable, the arm member 7 is firmly tightened by the fixing nut 11 via the guide plate 40, and finally the side case 15 is attached to the mounting portion 54 of the holder plate 40. .

When replacing the V-belt 13, loosen the fixing nut 11 to move the arm member 7 toward the device body 1 side, remove the old belt from the pulley 38 side, and replace the new belt with the pulley 34.
→ Wind the pulley 38 in that order and adjust the belt tension according to the above procedure.

Further, FIG. 3 shows another embodiment according to the present invention in which the side case and the mounting portion of the case are omitted by integrally forming the side case portion 40b at the end of the holder plate 40. In this case, not only the structure can be simplified, but also the side case need not be attached / detached at the time of adjusting the belt tension, so that the adjustment work can be performed quickly and reliably.

[Effect of device]

As described above, according to the engine cutter of the present invention, since the axial distance between the pulleys is adjusted by the eccentric amount of the eccentric cam arranged on the arm member, the belt tension is set. It has various advantages such as that the adjustment work including the above can be easily performed, and further, the durability of the belt can be improved by maintaining an appropriate tension and the work efficiency of cutting can be improved.
Its practical effect is extremely large.

Although the preferred embodiment of the engine cutter according to the present invention has been described above, the present invention is not limited to this embodiment, and various modifications can be made without departing from the spirit of the present invention. Of course.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a main part of a preferred embodiment of an engine cutter according to the present invention, FIG. 2 is a side view of a main part of the engine cutter shown in FIG. 1, and FIG. 3 is an engine cutter according to the present invention. FIG. 4 is a side sectional view of a portion corresponding to FIG. 2 of a conventional engine cutter of another embodiment of FIG. 1 ... Device body, 3 ... Mounting bolt, 5 ... Cutter unit, 7 ... Arm member, 9 ... Long hole, 11 ... Fixing nut, 13 ... V belt, 15 ... Side case, 30 ... … Output shaft, 32 …… Centrifugal clutch mechanism, 34 …… Pulley, 36 …… Cutter blade, 38 …… Pulley, 40 …… Holder plate, 40b …… Side case part, 42 …… Rotating operation shaft, 44 …… Eccentric cam, 46 …… Stopper, 48 …… Belt cover, 50 …… Mounting part,

Claims (2)

[Scope of utility model registration request] Claim: What is claimed is: 1. An engine cutter comprising a main body of an apparatus on which an engine is mounted and a cutter unit to which an arm member is attached, wherein a mounting bolt of the main body of the apparatus is inserted into a long hole of the arm member and tightened with a fixing nut. A holder plate is inserted between the member and the fixing nut, and an eccentric cam is rotatably disposed on the outer surface of the one arm member, and the eccentric cam is engaged with the holder plate to perform the eccentric action on the engine. An engine cutter, characterized in that it is configured to adjust the axial distance between the output shaft of and the rotary shaft of the cutter unit. 2. The engine cutter according to claim 1, wherein the holder plate is formed integrally with the side case of the device body.