JP2000185301A - Reciprocating saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the cutting fabricability and improve the cutting performance of a saw blade by providing a vibration part which applies a microvibration having a smaller amplitude and a higher frequency than the reciprocating motion of the saw blade, almost synchronized with the reciprocating motion, to a blade fitting part. SOLUTION: In the reciprocating saw 1, a vibration part 7 is provided which applies a microvibration having a smaller amplitude and a higher frequency than the reciprocating motion of a saw blade 3, almost synchronized with the reciprocating motion to a blade fitting part 4. The vibration part 7 has its outer periphery guided by the guide part 21 of a housing 2 for the body and has a sliding part 42 guided in the inner periphery to finely vibrate the blade fitting part 4. In addition, a movable iron core 71, a spring part 72 formed of a coil spring and a solenoid coil 73 are provided inside the cylindrical body 24 of the vibration part 7. The vibration part 7 intermittently magnetizes the movable iron core 71 by energizing the core 71 with an alternating current from the solenoid coil 73 and, returns the core 71 to its original position by the reaction of the spring part 72. Thus the vibration part 7 applies the microvibration, for example, with 0.01-10 mm amplitude and 5,000-10 MM vibration frequency per minute to the blade fitting part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating saw for cutting a workpiece by reciprocating a saw blade.

[0002]

2. Description of the Related Art Conventionally, in a reciprocating saw that reciprocates a saw blade and electrically cuts a workpiece, an appropriate vibration is applied to the saw blade in order to enhance the workability of the saw blade such as cutting efficiency. Are known. For example, Japanese Unexamined Patent Publication No.
There is a device disclosed in Japanese Patent No. 162001 in which a backup roller is provided so as to be in contact with the back line of a blade. That is,
In this case, the movement of the reciprocating saw blade in the forward or backward direction by the backup roller is added to the cutting progress direction of the saw blade, thereby improving the cutting efficiency of the saw blade.

[0003] Japanese Patent Publication No. 8-29504 discloses a holder in which a reciprocating cutting tool, which corresponds to the above-mentioned saw blade, is attached and finely vibrated in the front-rear direction by a vibrator.

[0004]

However, in the above-mentioned prior art, the forward or backward movement added to the former saw blade effectively cuts the workpiece by the saw blade. However, the latter micro-vibration in the front-rear direction was relatively unrelated to the reciprocating motion of the saw blade itself, and none of them was highly effective in improving sharpness. Therefore, there has been a demand for a reciprocating saw having improved cutting ability of the saw blade.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to improve the machinability by the two reciprocating movements of the saw blade, thereby improving the machinability of the saw blade. It is to provide a reciprocating saw.

[0006]

In order to achieve the above object, in a reciprocating saw according to the present invention, a workpiece is cut by reciprocating a saw blade attached to a blade attachment portion. The reciprocating saw is characterized in that a vibrating section is provided which substantially synchronizes with the reciprocating movement of the saw blade and applies micro-vibration having a smaller amplitude and a larger frequency to the blade attachment section.

In this case, when the workpiece is cut by reciprocating the saw blade attached to the blade attachment portion of the reciprocating saw, the blade is moved from the vibrating portion provided on the reciprocating saw. Micro vibrations having a smaller amplitude and a larger frequency than the reciprocating motion of the saw blade substantially synchronized with the reciprocating motion of the saw blade are applied to the saw blade via the attachment portion.

The frequency of the micro-vibration is the same as the direction of the movement of the saw blade, and the frequency of the micro-vibration in the anti-cutting direction operation is larger than that in the cutting direction operation of the saw blade. preferable.

In this case, the movement of the saw blade is the same as the direction of the movement of the saw blade, and the frequency of the saw blade in the anti-cutting direction operation is larger than that in the cutting direction operation on the workpiece. Micro-vibration having a large frequency and a smaller amplitude than the reciprocating motion of the saw blade substantially synchronized with the reciprocating motion of the saw blade is applied.

[0010] The direction of the micro-vibration may be the same as the direction of the movement of the saw blade, and its amplitude may be larger when the saw blade is operated in the anti-cutting direction than when the saw blade is operated in the cutting direction. preferable.

In this case, the movement of the saw blade is the same as that of the movement of the saw blade, and the amplitude of the saw blade in the anti-cutting direction operation is larger than that in the cutting direction operation of the workpiece. Micro-vibration having a large frequency and a smaller amplitude than the reciprocating motion of the saw blade substantially synchronized with the reciprocating motion of the saw blade is applied.

Preferably, the direction of the micro-vibration is perpendicular to the movement of the saw blade.

In this case, the saw blade is subjected to micro-vibration in a direction perpendicular to the direction of movement of the saw blade and having a smaller amplitude and a larger frequency than the reciprocation of the saw blade substantially synchronized with the reciprocation of the saw blade. Can be

Preferably, the saw blade has a rake angle on both sides of the blade ridge.

In this case, a micro-vibration having a large frequency and a smaller amplitude than the reciprocating motion of the saw blade substantially synchronized with the reciprocating motion of the saw blade is applied to the saw blade having a rake angle on both sides of the blade.

Further, it is preferable that the blade ridge has rake angles of different sizes on both sides thereof.

In this case, a micro-vibration having a large frequency with a smaller amplitude than the reciprocating motion of the saw blade substantially synchronized with the reciprocating motion of the saw blade is applied to a saw blade having rake angles of rake angles of different sizes on both sides thereof. Is added.

Preferably, the saw blade has a rake angle and a lateral rake angle on both sides of the blade ridge.

In this case, the micro-vibration having a large frequency with a smaller amplitude than the reciprocating motion of the saw blade substantially synchronized with the reciprocating motion of the saw blade is applied to the saw blade having a rake angle and a lateral rake angle on both sides of the blade. Is added.

It is preferable that the vibrating section includes a movable core provided on the blade attachment section, and an electromagnetic coil for magnetically driving the movable core to perform fine vibration.

[0021] In this case, the workpiece is placed on a reciprocating saw by a vibrating section in which a driving current is supplied to the electromagnetic coil and the movable iron core is driven. Is reciprocated and finely vibrated to be cut.

Further, it is preferable that the vibrating portion is made of a piezoelectric material provided on the blade attachment portion.

In this case, the workpiece is cut by a vibrating portion made of piezoelectric material provided on the reciprocating saw, and the saw blade is reciprocated through the blade attachment portion and finely vibrated. .

Further, a pressure sensor for detecting a reciprocating motion stopping force of the saw blade at the time of cutting is provided between the blade mounting portion and the vibrating portion, and a minute vibration is generated based on a detection signal from the pressure sensor. Is preferably controlled.

In this case, the minute vibration of the saw blade is based on the detection signal of the reciprocating motion stopping force of the saw blade during cutting by the pressure sensor provided between the blade attachment portion and the vibrating portion. And reciprocated.

It is also preferable that the vibrating section is a micro-vibration cam provided on the blade attachment section, and the micro-vibration cam is driven in conjunction with a driving source for reciprocating the saw blade.

In this case, the workpiece is mounted on the reciprocating saw by a vibrating portion formed by a fine vibration cam which is driven in conjunction with a driving source for reciprocating the saw blade. The saw blade is reciprocated and finely vibrated to perform cutting.

[0028]

1 to 7 show a first embodiment corresponding to all of the first to third, fifth, sixth, eighth and tenth aspects of the present invention, and FIG. FIGS. 9 and 10 show a second embodiment corresponding to claim 9, FIGS. 9 and 10 show a third embodiment corresponding to claim 11 of the present invention, and FIGS.
5 shows a fourth embodiment corresponding to claims 4 and 7 of the present invention.

[First Embodiment] FIGS. 1A and 1B are diagrams showing a schematic configuration of a reciprocating saw according to a first embodiment, in which FIG. 1A is a side sectional view, and FIG. 1B is a plan sectional view. . FIG. 2 is an explanatory diagram showing the cutting edge of the saw blade of the reciprocating saw. FIG. 3 is an explanatory diagram of excitation of the reciprocating saw on a saw blade. FIG. 4 is an explanatory diagram of the fine vibration of the reciprocating saw. FIG. 5 is an explanatory diagram of vibration control of the reciprocating saw on the saw blade. FIG. 6 is an explanatory view of another embodiment of the vibration of the reciprocating saw to the saw blade. FIG. 7 is an explanatory diagram of the vibration control on the saw blade of the reciprocating saw.

The reciprocating saw 1 of this embodiment is a reciprocating saw 1 for cutting a workpiece 9 by reciprocating a saw blade 3 attached to a blade attachment portion 4. A vibration unit 7 is provided which applies micro-vibration, which is substantially synchronous with the reciprocating motion and has a smaller frequency and a larger frequency to the blade attachment unit 4, than the reciprocating motion.

Further, in the reciprocating saw 1 of this embodiment, the micro-vibration has the same direction as the movement of the saw blade 3, which is smaller than when the cutting direction of the saw blade 3 into the workpiece 9 is operated. In some cases, the frequency increases in the anti-cutting direction operation. Further, in the reciprocating saw 1 of this embodiment, the saw blade 3 has a rake angle on both sides of the blade mountain 31. Further, in the reciprocating saw 1 of the embodiment, the blade 3
1 may also have rake angles of different sizes on both sides. Further, in the reciprocating saw 1 of this embodiment, the vibrating portion 7 includes the movable iron core 71 provided on the blade attachment portion 4, the electromagnetic coil 73 for magnetically driving the movable iron core 71 to perform fine vibration. Also have. Further, in the reciprocating saw 1 of the embodiment, a pressure sensor 8 for detecting a reciprocating motion stopping force of the saw blade 3 during cutting is provided between the blade attaching portion 4 and the vibrating portion 7. In some cases, micro-vibration is controlled based on a detection signal from the pressure sensor 8.

More specifically, the reciprocating saw 1 converts, for example, the rotational power of a driving motor 5 as a driving source into reciprocating motion, and reciprocates the saw blade 3 attached to the blade mounting portion 4. This is a jigsaw for cutting a workpiece 9 and has a structure as shown in FIG. That is, the reciprocating saw 1 includes a blade attachment portion 4 having a saw blade 3 attached to the tip of the main body housing 2, a converter 6 for converting the rotation of the drive motor 5 into reciprocating motion, and a converter 6. A vibrating unit 7 that applies micro-vibration to the reciprocating motion output from and transmits it to the blade attachment unit 4, and a pressure for transmitting a reciprocating motion stopping force of the saw blade 3 during cutting to a separately provided control unit. And a sensor 8.

The main body housing 2 is formed of, for example, aluminum die-casting. A guide portion 21 for slidingly guiding the vibrating portion 7 and an accommodation chamber 23 for accommodating a later-described conversion portion 6 are provided at the distal end side. A motor holding portion 22 that holds the drive motor 5 is provided on the rear side between the two. The guide portion 21 is provided with a rolling bearing device such as a ball bearing to guide the vibrating portion 7 slidably.

The saw blade 3 is made of, for example, tool steel and has a plurality of blade ridges 31 on one side edge of a long flat plate shape. The cutting amount of the saw blade 3 into the workpiece 9 is determined by a rake angle θ which is an angle formed between the cutting edge 31 and the workpiece 9 in the reciprocating motion of the saw blade 3 as shown in FIG. Decided. In this case, as shown in FIG. 2A, the blade ridge 31 has rake angles θ of different sizes (α, β) on both sides in this case. In the present invention, the rake angle θ of the blade ridge 31 may have the same value on both sides.

The blade attaching portion 4 is for attaching and reciprocating the saw blade 3 and fixing and holding the base end portion of the saw blade 3 at the distal end by a fixing means (not shown). Blade holder 4
1 and a sliding portion 42 slidably held by a vibration portion 7 described later, and is formed, for example, in a round bar shape. In this case, a pressure sensor 8 described later is provided at the rear of the sliding portion 42.
The movable iron core 71 of the vibrating section 7 is integrated with the intermediary of the movable iron core 71.

The drive motor 5 is a drive source for reciprocating the blade attachment section 4 via a conversion section 6 described later. In this case, the rotating shaft 51 is housed in the main body housing 2 in which the conversion section 6 is disposed. It is fixed to the motor holding part 22 so as to face the chamber 23. Note that a bevel gear 61 constituting the conversion unit 6 is fixed to the tip of the rotating shaft 51.

The conversion unit 6 controls the rotation of the drive motor 5
In this case, the reciprocating motion is transmitted to the saw blade 3 via the vibration unit 7 and the blade attachment unit 4. The conversion unit 6 is formed by integrating the above-described bevel gear 61, a bevel gear 63 corresponding to the bevel gear 61, and a drive shaft 64 that reciprocates the vibration unit 7.
A driving piece 62 that is pivotally supported by a bearing (not shown)
And a reciprocating piece 65 having an elongated hole 65a for slidably guiding the drive shaft 64. In addition, as shown in FIG. 1, the reciprocating piece 65 is provided with an electromagnetic coil 73 of the vibration unit 7 described later. In the conversion unit 6, the rotation of the drive motor 5 is, for example, 10 to 200
mm, the number of reciprocations is converted to 60-4000 reciprocations per minute.

The outer periphery of the vibrating section 7 is
, And guides the sliding portion 42 on the inner periphery,
The blade mounting portion 4 is finely vibrated in the same direction as the reciprocating motion of the saw blade 3 attached thereto. The movable iron core 71, a spring portion 72 formed of, for example, a coil spring, and the electromagnetic coil 7 are provided inside a cylindrical vibrating portion main body 74.
3 are arranged and formed. In this case, the movable iron core 71 is a permanent magnet magnetized so that the N pole and the S pole are arranged in the direction in which the micro-vibration is performed.

When the alternating current is applied to the electromagnetic coil 73, the vibrating portion 7 intermittently magnetizes the movable iron core 71 and returns by the reaction force of the spring portion 72. 〜１０10 mm, number of vibrations per minute is 5
A fine vibration of 000 to 10 million times is applied to the blade attachment portion 4. The vibrating unit 7 is connected to the connection line 73a of the electromagnetic coil 73, and is provided with a reciprocating movement of the saw blade by a control unit (not shown) formed around a microcomputer. The alternating current is output so as to be substantially synchronized with the cycle of and the driving is controlled.

More specifically, as shown in FIG. 3A, in the reciprocating motion A in which the horizontal axis is time and the vertical axis is the reciprocating speed of the saw blade 3, the saw blade is moved to the workpiece 9 in the forward direction. 3 and the anti-cutting direction operation B of the saw blade 3 which is the backward movement.
2 and the fine vibration C of the saw blade 3 shown in FIG.
In this case, in order to enhance the workability of the saw blade 3, the alternation is controlled such that the magnitude of the frequency of the micro-vibration C smaller than the reciprocating motion is substantially synchronized with the reciprocating motion A such that the period B1 <the period B2. Outputs current. As a result, as shown in FIG. 4A, in the amplitude waveform D of the saw blade 3, the cutting edge 31 can be cut into the workpiece 9 by the micro-vibration in all areas of the reciprocating motion of the saw blade 3. . That is, as shown in FIG.
As in the case where the frequency of the micro-vibration C is the same in all periods of the reciprocating motion, the period E in which the cutting edge 31 does not bite into the workpiece 9 due to the micro-vibration can be eliminated.

The pressure sensor 8 detects the resistance during cutting from the workpiece 9 to the saw blade 3 and is formed by, for example, a semiconductor pressure sensor, and corresponds to a reciprocating motion stopping force of the saw blade 3. The sliding part 4 of the vibrating part 7 from the saw blade 3 via the blade attaching part 4
2 sequentially detects the resistance load value at the time of cutting, and outputs this detection signal to the control unit. In this case, as shown in FIG. 5, the control unit controls the frequency of the micro vibration C, that is, the micro frequency change G, to increase when the cutting resistance change F during the cutting process increases. As a result, the amount of cutting by the saw blade 3 into the workpiece 9 is changed based on the cutting resistance, and the amount of cutting by the saw blade 3 can be adjusted so as to further reduce the cutting resistance. It is possible to further enhance the performance.

In the reciprocating saw 1, the reciprocating saw 1
When the workpiece 9 is cut by reciprocating the saw blade 3 attached to the blade attachment portion 4 of the above, the blade attachment portion 4 is moved from the vibrating portion 7 provided on the reciprocating saw 1. The saw blade 3 has, for example, an amplitude of 10 to 200 mm and a reciprocating frequency of 6 per minute.
0 to 4000 reciprocating movements, the movement of the saw blade 3 and the direction thereof are the same, and the number of vibrations is 5
Slight vibrations having an amplitude of 0.01 to 10 mm are applied to the saw blade 3 000 to 10 million times. The frequency of the micro-vibration is greater when the saw blade 3 is operated in the anti-cutting direction than when the saw blade 3 is operated in the cutting direction, and the saw blade 3 is substantially synchronized with the reciprocating motion of the saw blade 3. Is applied to the saw blade 3 with an amplitude smaller than that of the reciprocating motion and a large frequency. At this time, the drive current is supplied to the electromagnetic coil 73 provided on the reciprocating saw 1 on the saw blade 3 having the ridges 31 of the rake angle α and the rake angle β of different sizes on both sides thereof, and the saw blade 3 is movable. The saw blade 3 is reciprocated by the vibrating unit 7 to which the iron core 71 is driven via the blade attachment unit 4, and the above-described minute vibration is performed substantially in synchronization with the reciprocation to perform cutting.

Therefore, according to the reciprocating saw described above, when the workpiece 9 is cut by reciprocating the saw blade 3 attached to the blade mounting portion 4 of the reciprocating saw 1, From the vibrating part 7 provided on the reciprocating saw 1 via the blade attaching part 4,
Since the micro-vibration having a smaller amplitude and a larger frequency is applied to the saw blade 3 with a smaller amplitude than the reciprocating motion of the saw blade 3 substantially synchronized with the reciprocating motion of the saw blade 3, the cutting workability is improved by the two reciprocating motions of the saw blade 3. And the cutting ability of the saw blade 3 can be improved.

The direction of movement of the saw blade 3 is the same as the direction of the movement of the saw blade 3, and the frequency of the saw blade 3 in the anti-cutting direction operation is smaller than that in the cutting direction operation of the workpiece 9. Is large, and a micro-vibration having a large frequency is applied with an amplitude smaller than the reciprocating motion of the saw blade substantially synchronized with the reciprocating motion of the saw blade 3, so that a saw blade whose rake angle θ is not in the cutting direction is used, Even when the direction of movement is not the cutting direction, the cutting edge can be bitten, so that the cutting speed can be further improved. Further, micro-vibration having a large frequency and a smaller amplitude than the reciprocating motion of the saw blade 3 substantially synchronized with the reciprocating motion of the saw blade 3 is applied to the saw blade 3 having the rake angle θ on both sides of the blade mountain 31. Therefore, cutting can be effectively performed by reciprocating the saw blade 3.
In addition, the saw blade 3 having the ridges 31 having different rake angles (α, β) on both sides thereof has a larger frequency with a smaller amplitude than the reciprocating motion of the saw blade 3 substantially synchronized with the reciprocating motion of the saw blade 3. Is applied, so that the cutting can be more effectively performed by reciprocating the saw blade 3.

Further, the workpiece 9 is mounted on the reciprocating saw 1, and the excitation coil 7 is driven by the electromagnetic coil 73 to drive the movable iron core 71. , The saw blade 3 is reciprocated and finely vibrated to perform cutting, so that the fine vibration can be electrically controlled and thus easily controlled. Further, the minute vibration of the saw blade 3 is applied to a detection signal of the reciprocating motion stopping force of the saw blade 3 during cutting by the pressure sensor 8 provided between the blade attaching section 4 and the vibrating section 7. Since the reciprocating motion is performed based on the control, the cutting can be performed while the cutting resistance is reduced and the cutting amount is adjusted, so that the cutting can be performed more effectively.

Further, in addition to the above, the present invention is also applicable to a reciprocating motion A in which the horizontal axis represents time and the vertical axis represents the reciprocating speed of the saw blade 3, as shown in FIG. During the operation B1 in the cutting direction of the saw blade 3 into the workpiece 9 that is moving, and the operation B2 in the opposite cutting direction of the saw blade 3 that is moving backward, the micro-vibration C of the saw blade 3 is In order to improve the workability of the blade 3,
The alternating current is controlled so that the amplitude of the micro-vibration C smaller than the reciprocating motion is substantially synchronized with the reciprocating motion A so that the period B1 <the period B2. As a result, as shown in FIG. 6B, in the amplitude waveform D of the saw blade 3, the blade peak 31 can be cut into the workpiece 9 by the micro-vibration in all regions of the reciprocating motion of the saw blade 3. . That is, as described above, when the frequency of the micro-vibration C is the same in all the periods of the reciprocating motion, the period E in which the cutting edge 31 does not bite into the workpiece 9 by the micro-vibration can be eliminated. In addition, the cutting workability can be enhanced by the two reciprocating movements of the saw blade 3, so that the cutting performance of the saw blade 3 can be improved.

In the above case, the blade attachment section 4 and the vibration section 7
A pressure sensor 8 for detecting a reciprocating motion stopping force of the saw blade during cutting is provided, and a control unit for controlling micro-vibration based on a detection signal from the pressure sensor 8 is provided as shown in FIG. In addition, it is preferable to control the amplitude change H so that when the value of the cutting resistance change F decreases, the amplitude of the micro vibration C increases. As a result, the amount of cutting by the saw blade 3 into the workpiece 9 is changed based on the cutting resistance, and when the cutting edge 31 slides on the workpiece 9 and the cutting resistance is small, the amount of cutting by the saw blade 3 is small. Adjustment can be performed, so that the workability of the saw blade 3 can be further improved.

As in the present invention, when the cut amount in the workpiece 9 is adjusted by the slip between the blade ridge 31 and the workpiece 9, it is necessary to control the cut amount in accordance with the wear amount of the cutting edge. . In this case, for example, the blade tip 31 at an appropriate position of the saw blade 3
At the tip of the, an insulating layer and a conductive layer are provided in a plurality of layers to form a coating film, a change in the electrical resistance between the conductive layers is sequentially read, and the amount of change in the value is assumed as the amount of wear of the cutting edge. It is also preferable to calculate by adding the information of the wear amount of the cutting edge to the cutting resistance of the above, and to adjust the cutting amount by the saw blade 3 by changing the frequency of the micro-vibration C, for example. In addition, by improving the cutting depth of the saw blade 3 with the above configuration, it is also possible to thin out the blade ridges 31 at predetermined intervals, for example. This has the effect of simplifying the work.

[Second Embodiment] FIGS. 8A and 8B are diagrams showing a schematic configuration of a reciprocating saw according to a second embodiment. FIG. 8A is a side sectional view, and FIG. 8B is a plan sectional view. .

The reciprocating saw 1 of this embodiment differs from the first embodiment only in the configuration of the vibrating section, and the other components are the same as those of the first embodiment. In the reciprocating saw 1 according to the embodiment, the vibrating part 7 is formed as a piezoelectric material 75 provided on the blade attachment part 4.

More specifically, the reciprocating saw 1 is provided with a piezoelectric material 75 for applying micro-vibration to the reciprocating output from the converter 6 and transmitting the reciprocating output to the blade attachment 4 as in the first embodiment. The vibrating section 7 is provided.

The piezoelectric material 75 is provided with plate-shaped electrodes on both sides thereof, is integrated with the rear portion of the sliding portion 42 of the blade attachment portion 4, and is housed in, for example, a cylindrical vibrating portion main body 74. I have. Then, an alternating current in an ultrasonic frequency region of, for example, approximately 16 KHz is applied from the control unit via the connection line 75 a connected to this electrode, and the saw blade 3 is superposed through the blade attachment unit 4. Micro vibration in the sound wave frequency range. Reference numeral 8 denotes a pressure sensor for detecting a reciprocating motion stopping force of the saw blade 3 during the cutting operation. In this case, the pressure sensor 8 is disposed between the piezoelectric material 75 and the reciprocating piece 65 and is connected to the control unit. Outputs a detection signal.

Therefore, according to the reciprocating saw 1 described above, the workpiece 9 is provided on the reciprocating saw 1 by the vibrating portion 7 made of the piezoelectric material 75 via the blade attachment portion 4. Since the saw blade 3 is reciprocated and finely vibrated for cutting, the fine vibration can be electrically controlled, and thus can be easily controlled. Further, the minute amplitude can be controlled with high precision, and the micro-vibration in the ultrasonic frequency range can further improve the cutting performance by the cutting edge 31 and discharge the cutting chips at the time of cutting. The nature also increases,
This has the effect of improving workability.

[Third Embodiment] FIGS. 9A and 9B are diagrams showing a schematic configuration of a reciprocating saw according to a third embodiment. FIG. 9A is a side sectional view, and FIG. 9B is a plan sectional view. . 10A and 10B are diagrams showing a schematic configuration of another embodiment of the reciprocating saw, wherein FIG. 10A is a side sectional view, and FIG. 10B is a plan sectional view.

The reciprocating saw 1 of this embodiment differs from the first embodiment only in the configuration of the vibrating section, and the other components are the same as those of the first embodiment. In the reciprocating saw 1 according to the embodiment, the vibrating unit 7 is a micro-vibration cam 76 provided on the blade attachment unit 4, and the micro-vibration cam 76 is interlocked with a driving source that reciprocates the saw blade 3. Like being driven.

The converter 6 converts the rotation of the drive motor 5 as a drive source together with the micro-vibration cam 76 into a reciprocating motion on which the micro-vibration for driving the saw blade 3 is superimposed. More specifically, as shown in FIG.
A saw blade reciprocating cam 66 for reciprocating the saw blade 3 is provided,
With the rotational force of the saw blade reciprocating cam 66, the fine vibration cam 76
The drive shaft 64 is slidably guided along a long hole 43a provided in the base end portion 43 of the blade attachment portion 4 through
The blade attachment portion 4 is reciprocated while slightly vibrating.

Therefore, according to the reciprocating saw 1 described above, the workpiece 9 is interlocked by the saw blade reciprocating cam 66 from the drive source provided on the reciprocating saw 1 for reciprocating the saw blade 3. The saw blade 3 is reciprocated and finely vibrated by the vibrating unit 7 by the driven micro-vibration cam 76 through the blade attachment unit 4 to perform cutting, so that the rotation of the drive motor 5 of one driving source is rotated. The reciprocating motion and the micro-vibration can be applied to the saw blade 3 by the force, so that it can be achieved with a simple configuration. In addition, the timing of the interlocking of the reciprocating motion and the micro-vibration can be easily adjusted, and the operation can be easily stabilized.

The vibrating section 7 is a fine vibration cam provided on the blade attaching section 4, and the fine vibration cam is driven in conjunction with a driving source for reciprocating the saw blade 3 to generate fine vibration. In addition to the above, for example, as shown in FIG.
The motor housing 24 is slidably inserted into the accommodating chamber 23.
And the drive motor 5 is accommodated in the motor housing 24.
, And bevel gears 61 and 63
, The rotation of the bevel gear 63 is reduced, and the blade attachment section 4 is reciprocated via the saw blade reciprocating cam 67. it can.

[Fourth Embodiment] FIG. 11 is a side sectional view showing a schematic structure of a reciprocating saw according to a fourth embodiment. FIG. 12 is a perspective view showing the cutting edge of the saw blade of the reciprocating saw. 13 to 15 are explanatory views showing a schematic configuration of another embodiment of the reciprocating saw.

The reciprocating saw of this embodiment differs from the first embodiment only in the configuration of the vibrating part and the shape of the ridge of the saw blade, and the other components are the same as those in the first embodiment. In the reciprocating saw 1 of the present embodiment, the direction of the micro-vibration is perpendicular to the movement of the saw blade 3. Further, in the reciprocating saw 1 of the embodiment, the saw blade 3 has a rake angle and a lateral rake angle on both sides of the blade ridge 31.

The vibrating portion 7 has the blade mounting portion 4 mounted inside a cylindrical vibrating portion main body 74 whose outer periphery is reciprocated while being guided by the guide portion 21 of the main body housing 2. In order to slightly vibrate in the direction perpendicular to the reciprocating direction of the saw blade 3, the movable cores 78, 78 formed of permanent magnets and the movable core 78 are intermittently magnetized at the base end 44 of the blade attachment portion 4. And an electromagnetic coil 79 are disposed and formed.

The vibrating section 7 is controlled by outputting an alternating current from the aforementioned control section connected to the connection line 79a of the electromagnetic coil 79. Then, when an alternating current is applied to the electromagnetic coil 79, the movable iron core 78 is slightly vibrated in a direction orthogonal to the movement of the saw blade 3, and the amplitude thereof is, for example, 0.0.
Vibration frequency per minute is 1 to 10 mm and 5000 to 1
Ten million vibrations are applied to the blade attachment portion 4.

Further, as shown in FIG. 12, the saw blade 3 can effectively utilize the transverse vibration which is perpendicular to the reciprocating direction of the saw blade 3 as shown in FIG. And a side rake angle γ, which is an angle formed with the direction perpendicular to the reciprocating direction of the saw blade 3 together with the rake angle.

Therefore, according to the reciprocating saw 1 described above, the reciprocating movement of the saw blade 3 in the direction perpendicular to the direction of movement of the saw blade 3 is substantially synchronized with the reciprocating movement of the saw blade 3. Since micro-vibration having a small amplitude and a large frequency is applied, it is possible to effectively extrude chips while deepening the cut, thereby improving workability. Further, the saw blade 3 having the rake angle θ and the side rake angle γ on both sides of the cutting edge 31 has a large frequency with an amplitude smaller than the reciprocating motion of the saw blade 3 substantially synchronized with the reciprocating motion of the saw blade 3. Since micro-vibration is applied, cutting can be performed more effectively by reciprocating motion.

In addition to the above-described configuration, the micro vibration in the direction orthogonal to the movement of the saw blade 3 may be, for example, as shown in FIG.
As shown in FIG. 3, a piezoelectric material 7A and a spring portion 7B provided with plate-shaped electrodes on both sides of the blade attachment portion 4 are provided on the side of the blade attachment portion 4. Further, as shown in FIG. A micro-vibration cam 7C and a spring 7D for micro-vibrating in the direction orthogonal to the movement of the saw blade 3 by the rotational force of the drive motor 5 are provided on the side of the attachment portion 4, or as shown in FIG. As shown, the blade attachment part 4
Various configurations, such as a configuration in which a micro-vibration cam 7C for micro-vibrating in the direction orthogonal to the movement of the saw blade 3 by the rotational force of the drive motor 5 is disposed on the base end side of the motor, can be adopted.

The direction of the micro-vibration of the saw blade according to the present invention is, in addition to the above-mentioned direction, to the base end side of the blade attachment portion 4 as shown in FIG. The microvibration cam 7E for microvibration to draw an elliptical trajectory in a direction orthogonal to the movement of the micromotor 3 is provided to make the microvibration elliptical, or as shown in FIG.
A reciprocating switching cam 7F is provided on the blade mounting portion 4 for switching the moving direction of the reciprocating cam 66 for finely vibrating so as to draw a substantially eight-shaped locus in a direction orthogonal to the movement of the saw blade 3 with the rotational force of. Needless to say, as shown in FIG. 17 (b), those in various directions such as those in which the micro-vibration is made into a substantially eight-character locus J with respect to the workpiece 9 are included.

[0067]

The reciprocating saw of the present invention is embodied as in the above embodiment, and the workpiece is cut by reciprocating the saw blade attached to the blade attachment portion of the reciprocating saw. When the reciprocating saw has a large frequency with a smaller frequency than the reciprocating motion of the saw blade, which is substantially synchronized with the reciprocating motion of the saw blade, from the vibrating portion provided on the reciprocating saw through the blade attachment portion. As it is added to the saw blade,
The cutting workability can be enhanced by two reciprocating movements of the saw blade, so that the cutting performance of the saw blade can be improved.

The movement of the saw blade is the same as the direction of the movement of the saw blade, and the frequency of the saw blade in the anti-cutting direction operation is larger than that in the cutting direction operation on the workpiece. Since micro-vibration with a large frequency and a smaller amplitude than the reciprocation of the saw blade, which is substantially synchronized with the reciprocation of the blade, is applied,
A saw blade whose rake angle is not the cutting direction is used, and the cutting edge can be bitten even when the moving direction is not the cutting direction, so that the cutting speed can be further improved.

Also, the saw blade has the same direction as the movement of the saw blade, and has a greater amplitude when the saw blade is operated in the anti-cutting direction than when the saw blade is operated in the cutting direction. Since micro-vibration having a large frequency and a smaller amplitude than the reciprocating motion of the saw blade substantially synchronized with the reciprocating motion of the blade is applied, cutting workability can be enhanced by two reciprocating motions of the saw blade.
Thus, the cutting performance of the saw blade can be improved.

The micro-vibration is applied to the saw blade in a direction perpendicular to the direction of movement of the saw blade and having a smaller amplitude and a larger frequency than the reciprocating motion of the saw blade substantially synchronized with the reciprocating motion of the saw blade. Therefore, it is possible to effectively discharge the cutting powder at the same time as making the cut deeper, thereby improving workability.

Also, a micro-vibration having a larger frequency and a smaller amplitude than the reciprocating motion of the saw blade substantially synchronized with the reciprocating motion of the saw blade is applied to the saw blade having a rake angle on both sides of the blade mountain. Cutting can be effectively performed by reciprocating saw blades.

Further, a micro-vibration having a larger frequency with a smaller amplitude than the reciprocating motion of the saw blade substantially synchronized with the reciprocating motion of the saw blade is applied to the saw blade having rake angles of rake angles of different sizes on both sides thereof. Since it is added, cutting can be performed more effectively by reciprocating movement of the saw blade.

Further, a micro-vibration having an amplitude smaller than the reciprocating motion of the saw blade substantially synchronized with the reciprocating motion of the saw blade is applied to the saw blade having a rake angle and a lateral rake angle on both sides of the blade mountain. Since it is added, cutting can be performed more effectively by reciprocating motion.

Further, the workpiece is provided on a reciprocating saw, in which a driving current is applied to its electromagnetic coil to drive the movable iron core, and a saw blade is attached through a blade attachment portion. Since the reciprocating movement is performed and the micro-vibration is performed for the cutting, the micro-vibration can be electrically controlled, and thus can be easily controlled.

Further, the workpiece is cut by the vibrating portion made of piezoelectric material provided on the reciprocating saw, and the saw blade is reciprocated through the blade attachment portion and finely vibrated. The micro vibration can be electrically controlled, and thus can be easily controlled. Furthermore, it is possible to control minute amplitudes with high precision, and by vibrating finely in the ultrasonic frequency range, it is possible to further improve the cutting performance due to the cutting edge and to discharge chips when cutting. And the workability can be improved.

Further, the micro-vibration of the saw blade is based on a detection signal of a reciprocating motion stopping force of the saw blade at the time of cutting by a pressure sensor provided between the blade mounting portion and the vibrating portion. Since the reciprocating motion is controlled, the cutting can be performed while reducing the cutting resistance and adjusting the cutting depth, and thus the cutting can be performed more effectively.

Further, the workpiece is passed through a blade attachment section by a vibrating section provided by a fine vibration cam, which is provided on the reciprocating saw and driven in conjunction with a driving source for reciprocating the saw blade. Since the saw blade is reciprocated and finely vibrated and cut, the reciprocating motion and fine vibration can be applied to the saw blade by the rotational force of one drive source, so that a simple configuration can be achieved. In addition, the timing of the interlocking of the reciprocating motion and the micro-vibration can be easily adjusted, and the operation can be easily stabilized.

[0078]

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a reciprocating saw according to a first embodiment of the present invention, where (a) is a side sectional view and (b) is a plan sectional view.

FIG. 2 is an explanatory diagram showing a blade ridge of a saw blade of the reciprocating saw.

FIG. 3 is an explanatory view of exciting the reciprocating saw to a saw blade.

FIG. 4 is an explanatory diagram of micro vibration of the reciprocating saw.

FIG. 5 is an explanatory diagram of vibration control of the reciprocating saw on a saw blade.

FIG. 6 is an explanatory diagram of another embodiment of the vibration of the reciprocating saw to the saw blade.

FIG. 7 is an explanatory diagram of vibration control of the reciprocating saw on a saw blade.

8A and 8B are diagrams showing a schematic configuration of a reciprocating saw according to a second embodiment, in which FIG. 8A is a side sectional view, and FIG. 8B is a plan sectional view.

FIGS. 9A and 9B are diagrams showing a schematic configuration of a reciprocating saw according to a third embodiment, wherein FIG. 9A is a side sectional view and FIG. 9B is a plan sectional view.

FIG. 10 is a view showing a schematic configuration of another embodiment of the reciprocating saw, wherein (a) is a side sectional view and (b) is a plan sectional view.

FIG. 11 is a side sectional view showing a schematic configuration of a reciprocating saw according to a fourth embodiment.

FIG. 12 is a perspective view showing a blade ridge of a saw blade of the reciprocating saw.

FIG. 13 is an explanatory diagram showing a schematic configuration of another embodiment of the reciprocating saw.

FIG. 14 is an explanatory view showing a schematic configuration of another embodiment of the reciprocating saw.

FIG. 15 is an explanatory diagram showing a schematic configuration of another embodiment of the reciprocating saw.

FIG. 16 is an explanatory view showing a schematic configuration of another embodiment of the reciprocating saw of the present invention.

FIG. 17 is an explanatory diagram showing a schematic configuration of another embodiment of the reciprocating saw.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 reciprocating saw 3 saw blade 31 blade tip 4 blade attaching portion 7 vibrating portion 71 movable core 73 electromagnetic coil 8 pressure sensor 9 workpiece

Claims (11)

[Claims] A reciprocating saw for cutting a workpiece by reciprocating a saw blade attached to a blade attachment portion, substantially in synchronization with the reciprocating motion of the saw blade, and having an amplitude smaller than the reciprocating motion. A reciprocating saw having a vibrating portion for applying micro-vibration having a large frequency to a blade attachment portion. 2. The micro-vibration is such that the direction of the movement of the saw blade is the same as that of the movement of the saw blade, and the frequency of the operation of the saw blade in the anti-cutting direction operation is larger than that in the cutting direction operation of the workpiece. The reciprocating saw according to claim 1, wherein: 3. The micro-vibration is such that the direction of the movement of the saw blade is the same as the direction of the movement of the saw blade, and the amplitude of the movement of the saw blade in the anti-cutting direction operation is larger than that in the cutting direction operation of the workpiece. The reciprocating saw according to claim 1, wherein: 4. The reciprocating saw according to claim 1, wherein the direction of the fine vibration is a direction orthogonal to the movement of the saw blade. 5. The reciprocating saw according to claim 1, wherein the saw blade has a rake angle on both sides of the blade ridge. 6. The reciprocating saw according to claim 5, wherein the blade ridges have rake angles of different sizes on both sides thereof. 7. The reciprocating saw according to claim 4, wherein the saw blade has a rake angle and a lateral rake angle on both sides of the blade ridge. 8. The vibrating unit includes a movable core provided on the blade attachment unit, and an electromagnetic coil that magnetically drives the movable core to perform micro-vibration. A reciprocating saw according to any one of the preceding claims. 9. The reciprocating saw according to claim 1, wherein the vibrating portion is made of a piezoelectric material provided on the blade attachment portion. 10. A pressure sensor for detecting a reciprocating motion stopping force of a saw blade during cutting processing is provided between a blade attachment portion and a vibration portion,
10. The reciprocating saw according to claim 8, wherein the micro-vibration is controlled based on a detection signal from the pressure sensor. 11. The vibrating unit is a micro-vibration cam provided on the blade attachment unit, and the micro-vibration cam is driven in conjunction with a driving source that reciprocates the saw blade. A reciprocating saw according to any one of claims 1 to 7, wherein