JP3002414U - Driving device for hand cutter by belt and gear - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] The present invention relates to a hand cutter drive device that uses a belt and a gear to transmit the rotational output of an engine as the rotational output of a blade and reduce it. Prevents slippage that is difficult to adjust, secures a large cutting depth of the blade, and obtains a hand cutter that is easy to handle. [Structure] A small-diameter gear 12 is concentrically fixed to a large-diameter input pulley 6 on which a belt 1 from a prime mover is hung, and separately from this, an output gear 13 for rotating a blade fixing shaft 8 is provided with a tooth more than the small-diameter gear. A drive mechanism for providing a large number of gears and linking the output gear and the small-diameter gear via an idle gear 15 is housed in a housing 14 in which a mounting mount for the prime mover is formed on one side, and the mounting is performed. A slit hole 4 for tension adjustment was added to the mounting mount.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a hand cutter driving device using a belt and a gear for transmitting a rotational output of an engine as a rotational output of a blade and decelerating it in a hand cutter or a concrete cutter using an engine.

[0002]

[Prior art]

 FIG. 2 is known as a means for transmitting and decelerating the rotational output of a conventional engine as the rotational output of a blade. In this means, a support arm that joins the engine, the blade and the safety cover is used as a housing, and a small pulley is concentrically attached to a large input pulley on which a belt from the engine is hung. The cutter is a drive mechanism in which an output pulley for rotating a blade is provided with a diameter larger than that of the small-diameter pulley, and the output pulley and the small-diameter pulley are linked via a belt. With such a configuration, the rotation output of the engine can be transmitted as the rotation output of the blade and decelerated.

[0003]

[Problems to be solved by the device]

 In the prior art, in order to prevent slipping due to belt transmission, and to re-apply the tension of a belt that is tired and loosened, for the belt (1) in Fig. 2, the mounting mount (on the engine (2) side ( 3) The processing was done by the relationship between the slit hole (4) for tension adjustment formed on one side and the mounting bolt. The belt (1) is a belt that is wound around the output pulley (5) on the engine side and the large-diameter input pulley (6) as shown in FIG. Regarding the belt (7) shown in FIG. 2, the problem due to the belt transmission similarly occurs, but the technical idea to solve this problem is to be provided. As shown in FIG. 2, the belt (7) is a belt that is hung on the output pulley (9) that rotates the blade fixing shaft (8) and the small-diameter pulley (10) that is concentrically fixed to the large-diameter input pulley (6). is there.

If the output pulley (5) on the engine side and the output pulley (9) that rotates the blade fixing shaft (8) are connected by a single belt, the output pulley (5) is formed on one side of the mounting mount (3). Although it can be handled by the relationship between the slit hole (4) for tension adjustment and the mounting bolt, the output pulley that rotates the blade fixing shaft (8) when trying to secure the necessary reduction ratio with one belt. The diameter of (9) must be made larger. The output pulley (9) is concentric with the blade (11), and the larger the diameter of the output pulley (9), the shorter the effective cutting depth of the blade (11), which is disadvantageous in the spec of cutting ability. Become. The double belt type described in the preceding paragraph satisfied both transmission and deceleration of the engine rotation output, and was able to secure a large effective cutting depth of the blade (11).

[0005]

[Means for Solving the Problems]

 In order to solve various problems such as slips on the belt (7), a small-diameter gear is fixed concentrically to a large-diameter input pulley on which the belt from the engine is attached. An output gear for rotating the shaft is provided with a larger number of teeth than the small diameter gear, and a drive mechanism for linking the output gear and the small diameter gear via an idle gear is attached to the engine (2) side. An attempt is made to provide a drive device for a hand cutter using a belt and a gear, characterized in that the mount is housed in a housing that is formed on one side, and a slit hole for tension adjustment is also installed in the mounting mount. It is a thing. An accessory such as an idler for maintaining tension may be installed in relation to the belt (7), but in this case, extra space for installing the idler is required near the blade fixing shaft (8). However, the mechanism and parts are complicated and have drawbacks.

Two slit holes (4) for tension adjustment are provided in the mounting mount (3) on the engine (2) side. This is based on the fact that there are usually two mounting bolts on the engine (2) side. Regarding the reduction ratio, there is one-third between the output pulley (5) on the engine side and the large-diameter input pulley (6), and the small-diameter gear (12) that is fixed coaxially to the large-diameter input pulley (6). ) And the output gear (13) for rotating the blade fixed shaft (8), a deceleration of 7/10, about 1/4 in total, can be achieved. Specific examples of the number of teeth and the size of the pulley are as follows: the small-diameter gear (12) is 19, the output gear (13) is 28, the engine-side output pulley (5) is 4 cm in diameter, and the large-diameter input pulley (6). ) Is considered to have a diameter of 12 cm.

[0007]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 5, an output gear (13) for rotating a blade fixing shaft (8), an idle gear ( 15) Align the gear engagement with the small diameter gear (12). The small-diameter gear (12) is concentrically fixed to the large-diameter input pulley (6). The blade fixing shaft (8) is projected toward the outside of the housing (14), and the blade (11) is screwed onto the tip of this shaft. The knife (11) is partially surrounded by a safety cover (16), and the safety cover (16) is joined and fixed to a part of the outer side surface of the housing (14). Further, the dust cover (17) may be formed in the safety cover (16). The dust suction port (17) communicates with the dust suction device (19) by a dust suction hose (18). At the right end of the housing (14), a mounting mount (3) for the engine (2) side is formed. A slit hole (4) is formed in the mounting mount (3), and a mounting bolt is passed through this hole to be screwed into a screw hole on the engine (2) side and tightened. The mounting mount (3) and engine (2) are in strong contact with each other due to the frictional force generated when the mounting bolt is tightened. Hang the belt (1) on the large diameter input pulley (6) and the engine output pulley (5). The tension of the belt (1) can be adjusted by the positional relationship between the slit hole (4) and the screw hole on the engine (2) side. After deciding the positional relationship by temporary fastening, completely tighten the mounting bolts, and finally firmly attach the mounting mount (3) and the engine (2).

The idle gear (15) has a role of aligning the rotation directions of the small-diameter gear (12) and the output gear (13), and a role of bridging the rotation output of the small-diameter gear (12) to the output gear (13). The left end of the housing (14) (the part where the output gear (13) is housed) has a role of bringing it into a pointed shape. By being brought out in such a manner, a large cutting depth of the blade (11) can be secured. In that sense, the number of idle gears (15) is not limited to one, and several may be arranged. This is because if the distance from the large-diameter input pulley (6) to the output gear (13) can be increased, it becomes easier to form a pointed shape. Since the idle gear (15) bridges the rotation output of the small diameter gear (12) to the output gear (13), no slip occurs in the range equivalent to the double belt type belt (7).

[0009]

[Effect of device]

 According to the present invention, not only a large cutting depth of the cutting tool can be secured, but also an unadjusted slip can be prevented. Only the belt (1) is allowed to slip, and for this belt (1), tension adjustment can be performed by utilizing the action of the slit hole formed in the mounting mount. The belt (1) absorbs or absorbs the impact load applied to the blade, resulting in a hand cutter that is easy to handle. The synergistic effect of slip due to the double belt type can be eliminated, and efficient driving force transmission and appropriate shock absorption and absorption can be achieved delicately with good balance.

[Brief description of drawings]

FIG. 1 is a perspective view showing a drive mechanism in a housing.

FIG. 2 is a perspective view showing a drive mechanism in a conventional double belt type housing.

FIG. 3 is a side view showing the relationship between the housing, the engine, and the blade.

FIG. 4 is a side view showing a relationship between a conventional double-belt type housing, an engine and a blade.

FIG. 5 is a perspective view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Belt 2 Engine 3 Mounting Mount 4 Slit Hole 5 Engine Side Output Pulley 6 Large Diameter Input Pulley 7 Belt 8 Blade Fixed Shaft 9 Output Pulley 10 Small Diameter Pulley 11 Blade 12 Small Diameter Gear 13 Output Gear 14 Housing 15 Idle Gear 16 Safety cover 17 Dust suction port 18 Dust suction hose 19 Dust suction device

Claims (1)

[Scope of utility model registration request] 1. A small-diameter gear is concentrically fixed to a large-diameter input pulley on which a belt from an engine is hung. Separately from this, an output gear for rotating a blade fixing shaft has a larger number of teeth than the small-diameter gear. The drive mechanism that links the output gear and the small-diameter gear through an idle gear is housed in a housing that has a mounting mount for the engine side formed on one side, and the tension adjustment is performed on the mounting mount. A drive device for a hand cutter with a belt and a gear, which is characterized by having a slit hole for it.