KR102088591B1 - No-load electric saw - Google Patents

Abstract

According to the present invention, provided is a no-load electric saw capable of transferring and cutting a workpiece as a saw blade is linearly reciprocated by normal and reverse driving forces of a motor. More specifically, the no-load electric saw includes: a transfer screw part (10) connected to the motor (M) to be rotated normally or reversely in a housing (100); and a linear rod part (30) connected to an acceleration clutch part (20) pitch-transferred by being screwed with the transfer screw part (10) to be linearly reciprocated in the housing (100), and including a saw blade holder (32) provided at an end. The acceleration clutch part (20) comprises: an outer wheel boss (24) including an operation chamber (24a) installed therein; and an inner wheel boss (22) screwed with the transfer screw part (10) to be pitch-transferred while being linearly reciprocated in the operation chamber (24a) due to a key combination with the outer wheel boss (24). Therefore, the no-load electric saw is capable of considerably reducing battery consumption as well as preventing a motor overload in a start section where normal and reverse directions of a motor are switched as a cutting stroke distance of a saw blade is extended in a compact structure.

Description

No-load electric saw

The present invention relates to a no-load power saw, and more specifically, a no-load power saw that significantly reduces battery consumption as well as prevents motor overload in a start section in which the forward and reverse rotation directions of the motor are switched while the saw blade cutting stroke is extended in a compact structure. It is about.

Typically, saws are sharp teeth formed on a thin saw blade made of steel, and are devices for cutting objects containing sharp lice trees by a linear reciprocating force in the longitudinal direction. They are mainly used for pruning trees, pruning trees, and planting forests. Although it is widely used for aerial work including business, it takes a lot of power to manually cut a workpiece to a long distance, and it is impossible to work for a long time.

Accordingly, in the patent registration No. 10-1129771 disclosed in the related art, a power generating means such as a power generating device and a wire for generating power, a housing, and a motor driven by receiving power of the power generating device from inside the housing And a drive shaft that rotates in conjunction with the motor and transmits rotation by forming a worm gear on the other side, an eccentric cam installed inside the housing, and a rod portion coupled to the cam portion of the eccentric cam and linearly transferred to the end of the rod portion A transfer gear provided, a fixed rack gear fixed to the inside of the housing to couple the transfer gear in the form of a gear bite, a driving body positioned horizontally spaced apart from the fixed rack gear and driven back and forth by the transfer gear, It consists of a saw blade that is installed in front of the driving body. The line has been registered.

However, in the prior art, the motor rotational force is converted into a linear reciprocating motion by the eccentric cam and the rod portion, and the saw blade is cut and transferred, but due to the nature of the power transmission structure by the eccentric cam and the rod portion, the eccentric cam size is required to expand the stroke distance. As it has to be enlarged, the weight and volume are increased, and when the stroke distance is extended by engaging the fixed rack gear and the rack gear as a transfer gear as in the prior art, the motor is overloaded, especially when the saw blade is linearly reciprocated and the transfer direction is switched. When the motor was stopped and driven in the reverse direction at the time, the load in the motor start section was greatly increased, and the end of the battery was easily discharged.

KR 10-1129771 B1 (2012.03.15)

Accordingly, the present invention has been devised to solve the above-mentioned problems, and the saw blade cutting stroke distance is expanded in a compact structure by the pitch feed force of the forward and reverse rotating feed screw parts and the acceleration clutch part, and the motor by the acceleration clutch part Since the transfer screw driving force is absorbed from the moment the rotational direction is switched to the rated rotational speed, the overload is prevented in the motor start section and the battery consumption is greatly reduced, so the operating time is extended in the field. The object of the present invention is to provide a no-load chainsaw that reduces noise and prolongs component life by absorbing shock when the boss reaches the rectilinear travel distance dead point.

In order to achieve this object, the feature of the present invention, in a no-load power saw in which the saw blade 1 is linearly reciprocated by the forward and reverse driving force of the motor M, is connected to the motor M, A forward screw part 10 rotated forward and backward in the housing 100; It is screwed to the transfer screw portion 10 and connected to the acceleration clutch portion 20 that is pitch-transferred, linearly reciprocated within the housing 100, and a straight rod portion 30 provided with a saw blade holder 32 at the end. It is made, including, the acceleration clutch portion 20, the outer ring boss 24 is provided with an operating chamber (24a) therein, the screw screw is coupled to the feed screw 10, the outer ring boss while being transferred to the pitch ( It is characterized in that it consists of an inner ring boss 22 that is linearly reciprocated in the operating chamber (24a) by the key combination with 24).

At this time, the inner ring boss 22 is the outer ring boss 24, the linear reciprocating travel stroke distance within the operating chamber (24a) is limited, the inner ring boss 22 is rated rotation from the moment the motor (M) rotation direction is switched It is characterized in that an acceleration section of the motor M is formed while no load is transferred in the axial direction of the straight rod portion 30 in the operation chamber 24a until the speed is reached.

In addition, both sides of the inner chamber boss 22 and the operation chamber 24a corresponding to both ends are characterized in that buffer means 40 including a buffer rubber, a spring, and a pneumatic damper are provided.

In addition, the buffer means 40 made of the pneumatic damper, the compression chamber 42 formed on both sides of the operating chamber 24a and the inner ring boss 22 are provided at both ends of the compression chamber 42 on either side during linear reciprocation. A piston 44 provided to compress internal air and a check valve 46 formed on the inner ring boss 22 or the outer ring boss 24 to block external air discharge while allowing external air injection into the compression chamber 42 ), When the inner ring boss 22 reaches the rectilinear stroke distance dead point, a buffer force is generated as the inside air is compressed, and then the inner ring boss 22 checks when the direction switch is turned 46 It is characterized in that it is provided so that the outside air is injected into the compression chamber 42 is opened.

According to the above configuration and operation, the present invention is the moment when the rotational direction of the motor is switched by the acceleration clutch part while the saw blade cutting stroke distance is expanded in a compact structure by the forward and reverse rotation of the feed screw part and the pitch feed force of the acceleration clutch part. Since the transfer screw driving force is absorbed from to the rated rotational speed, the overload prevention in the motor start section and the battery consumption are greatly reduced, so the operation time is extended in the field. When the dead point is reached, the shock is absorbed to reduce noise and prolong the life of parts.

1 is a block diagram showing an overall no-load chainsaw according to an embodiment of the present invention.
Figure 2 is a block diagram showing the operation state of the forward and reverse linear rod portion by the clutch of the no-load chainsaw according to an embodiment of the present invention.
3 to 4 is a block diagram showing a buffer means in the clutch of a no-load chainsaw according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a no-load power saw in which the saw blade 1 is linearly reciprocated by the forward and reverse driving force of the motor (M), and the cutting-off power saw is a forward and reverse rotation feed screw part and an acceleration clutch part. In the compact structure due to the pitch feed force, the travel distance of the saw blade is extended, and the transfer screw driving force is absorbed from the moment the motor rotation direction is switched by the accelerator clutch to the rated rotation speed. The consumption time is greatly reduced and the operating time is extended in the field. In particular, the shock absorber is absorbed when the inner ring boss of the accelerator clutch reaches the rectilinear travel distance dead point by the shock absorbing means to reduce noise and prolong the life of parts. It consists of a main configuration including a part 10, an acceleration clutch part 20, and a straight rod part 30.

The transfer screw unit 10 according to the present invention is connected to a motor M whose rotation direction is switched by a control unit, and is provided to be rotated forward and backward in the housing 100. The motor M is provided as a battery-integrated or separate type, and a handle is formed on the outer circumferential surface of the motor, or a separate worktable is connected to expand the working range for aerial work. In addition, the motor M detects a linear reciprocating oblique point (eg, a maximum forward and backward travel point) of the linear rod unit 30 to be described later by a sensor and a relay, and the driving direction is switched or the motor M rotation speed is determined. By counting, the forward and reverse direction change points are detected.

Here, the transfer screw portion 10 is a male threaded rod, one end of which is installed so as to be freely rotated with the bearing assembly at the housing end, so that the motor M is connected, and the other end is screwed into the acceleration clutch portion 20, which will be described later. The motor M is fed forward and backward in a straight line according to the forward and reverse directions.

On the other hand, in the front of the housing 100, an annular saw blade guide is provided as shown in FIG. 1, and a guide groove is formed in the saw blade guide in a state in which the saw blade tip is accommodated, and a workpiece is cut in the annular portion of the annular saw blade guide. By installing a chainsaw in the form of hanging, the aerial work is carried out without great effort.

In addition, the acceleration clutch unit 20 according to the present invention, the outer ring boss 24 is provided with an operating chamber (24a) therein, the screw is coupled to the feed screw 10, the pitch is transferred while the outer ring boss 24 It is composed of an inner ring boss 22 that is reciprocated in a straight line within the operation chamber 24a by key coupling.

That is, the acceleration clutch portion 20 is screwed to the transfer screw portion 10, an inner ring boss 22 that is pitch-transferred, and an operation chamber 24a for receiving the inner ring boss 22 are formed, and a straight rod is formed. The outer ring boss 24 which is connected to the part 30 and transmits the pitch transfer force of the inner ring boss 22, and the guide rail 24b formed in the axial direction of the straight rod part 30 on the outer ring boss 24, It is composed of a sliding key (22a) formed on the outer circumferential surface of the inner ring boss (22) so that the guide rail (24b) rides a linear reciprocation.

As described above, the inner ring boss 22 is key-coupled by the guide rail 24b and the sliding key 22a in a state accommodated in the outer ring boss 24 operating chamber 24a, so that the rotational force of the transfer screw section 10 is straight It is converted to a transfer force and is provided to linearly reciprocate the front and rear linear rods 30 to be described later. At this time, the inner ring boss 22 is formed in a smaller size than the size of the operating chamber 24a and the transfer screw unit 10 ) After a certain amount of no-load linear movement by the rotational force, a straight rod portion from the point where one end of the inner ring boss 22 is interviewed on the side of the operating chamber 24a or one end of the sliding key 22a is interviewed on one side of the guide rail 24b. The pitch feed force is transmitted to the (30) side.

That is, FIG. 2 (a) shows that the inner ring boss 22 moves forward in the operating chamber 24a in the forward direction (the direction of the saw blade installation) by the forward rotational force of the transfer screw 10, and then the forward transfer force of the straight rod 30 Figure 2 (b) shows a state in which the transfer, the straight screw portion after the inner ring boss 22 is moved to the rear direction (motor installation direction) within the operating chamber 24a by the reverse rotational force of the transfer screw portion 10 (30) It shows a state in which the reverse feed force is transmitted, and the workpiece is cut by a saw blade by repeatedly performing this operation.

Thus, the inner ring boss 22 is the outer ring boss 24, the linear reciprocating travel stroke distance in the operating chamber (24a) is limited, the inner ring boss 22 is rated rotation from the moment the motor (M) rotation direction is switched As the motor (M) acceleration section is formed while no load is transferred in the axial direction of the straight rod part (30) in the operating chamber (24a) until the speed is reached, the motor (M) reaches the rated rotational speed. Since the pitch transfer force of the inner ring boss 22 by 10) is absorbed, there is an advantage of preventing overload of the starting section of the motor (M) and greatly reducing battery consumption, thereby extending the operating time in the field.

Further, on both sides of the operation chamber 24a corresponding to both ends of the inner ring boss 22, buffer means 40 including a buffer rubber, a spring, and a pneumatic damper are provided. The buffer means 40 made of the pneumatic damper is provided at both ends of the compression chamber 42 formed on both sides of the operation chamber 24a and the inner ring boss 22, and the air inside one compression chamber 42 during linear reciprocating motion The piston 44 is provided to compress the inner ring boss 22 or the outer ring boss 24 is formed in the compression chamber 42 while allowing external air injection into the check valve 46 to block the discharge of internal air It is composed. 3 to 4, the check valve 46 is formed with a flow path so as to communicate with the outer circumferential surface of the inner ring boss 22 and both sides of the piston 44, and the both side flow passages corresponding to the piston 44 are provided with balls to prevent backflow. It is structured to have a structure.

In operation, as shown in Fig. 3 (a), the inner and outer ring bosses 22 and 24 of the acceleration clutch 20 by the reverse rotational force of the feed screw portion 10 reach the reverse dead point, and then the motor M When is turned in the forward direction, as shown in Figure 3 (b), the outer ring boss 24 is stopped while the inner ring boss 22 is independently moved forward by sliding movement of the guide rail 24b and the sliding key 22a. At this time, as the check valve 46 on one side is opened, external air is injected into the compression chamber 42 to prevent power loss due to vacuum pressure.

Subsequently, as shown in Fig. 4 (a), the inner ring boss 22 is independently moved forward by the sliding movement of the guide rail 24b and the sliding key 22a, so that the instantaneous piston 44 approaches the side wall in all directions of the operating chamber. Inserted into the compression chamber 42, while compressing the internal air, the impact of the inner ring boss 22 is absorbed, and then the inner ring boss 22 presses the outer ring boss 24, as shown in FIG. ) Is generated. Then, when the straight rod portion 30 reaches the forward dead point, the same operation as when the reverse dead point is reached is repeated.

As described above, when the inner ring boss 22 reaches the straight reciprocating stroke distance dead point (front, reverse end point), the internal air is compressed and the buffer force is generated, and when the inner ring boss 22 changes direction, the check valve ( 46) As the opening is opened and external air is injected into the compression chamber 42, power loss due to vacuum pressure is prevented, and noise reduction and component life are prolonged.

In addition, the straight rod portion 30 according to the present invention is connected to the acceleration clutch portion 20 and is linearly reciprocated within the housing 100, and a saw blade holder 32 is provided at the end. The straight rod portion 30 is formed in the form of an empty pipe, and the transfer screw portion 10 is inserted and installed, and a saw blade holder 32 is provided at the end, so that the saw blade is detachably installed. The straight rod portion 30 or the outer ring boss 24 is guided by a key and key groove coupling in the housing 100, and is provided to be guided by a ball bushing and an airtight chamber in the housing 100.

As described above, since the saw blade cutting stroke distance is secured in such a way that the feed screw portion 10 is inserted and pulled out into the straight rod portion 30, the saw blade cutting stroke distance is extended to a long size in a compact structure and a large diameter tree Or there is an advantage that the range of use for cutting the tube body is expanded.

10: transfer screw unit 20: acceleration clutch
30: straight rod portion 40: buffer means

Claims (4)

In the no-load power saw in which the saw blade (1) is linearly reciprocated by the forward and reverse driving force of the motor (M) to be cut and fed,
It is connected to the motor (M), the forward and backward rotation screw 10 in the housing 100;
It is screwed to the transfer screw portion 10 and connected to the acceleration clutch portion 20 that is pitch-transferred, linearly reciprocated within the housing 100, and a straight rod portion 30 provided with a saw blade holder 32 at the end. Including ;,
The acceleration clutch portion 20, the outer ring boss 24 is provided with an operating chamber (24a) therein, is screwed to the transfer screw portion 10, while the pitch is conveyed by key coupling with the outer ring boss (24) Consists of an inner ring boss (22) that is linearly reciprocated in the operating chamber (24a),
The inner ring boss 22 is limited to the linear reciprocating travel stroke distance within the outer ring boss 24 operating chamber 24a, and the inner ring boss 22 is rated at the rotational speed from the moment the motor M rotation direction is switched. Unloaded chainsaw characterized in that the motor (M) acceleration section is formed while being transferred unloaded in the axial direction of the straight rod portion 30 in the operation chamber 24a until reaching. delete According to claim 1,
The inner ring boss 22, both ends of the operation chamber (24a) corresponding to the both ends are provided with a shock absorbing means 40 comprising a shock absorbing rubber, spring, pneumatic damper. According to claim 3,
The buffer means 40 made of the pneumatic damper is provided at both ends of the compression chamber 42 formed on both sides of the operation chamber 24a and the inner ring boss 22, and the air inside one compression chamber 42 during linear reciprocating motion The piston 44 is provided to compress the inner ring boss 22 or the outer ring boss 24 is formed in the compression chamber 42 while allowing external air injection into the check valve 46 to block the discharge of internal air It is configured, when the inner ring boss 22 reaches the rectilinear stroke distance dead point, the inside of the compression chamber 42 is compressed and the buffer force is generated, and then the check valve 46 is opened when the inner ring boss 22 changes direction. The unloaded chainsaw characterized in that it is provided so that external air is injected into the compression chamber 42.

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