JPH0572321U - Electric jigsaw - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent cutting chips generated during the cutting work of an electric jigsaw from accumulating on the reference line and perform accurate cutting. A pump shaft 6 that vertically moves in accordance with the vertical movement of a reciprocating shaft 3 to which a saw blade 4 is attached is provided on a device portion 2B of a case 2. Then, the air pump 7 having the air chamber defining member 9 that reciprocates by the pump shaft 6 is attached to the case 2 of the electric jigsaw 1. In addition, the discharge air from the discharge port of the air pump 7 is sent through the discharge pipe 15 to the saw blade 4.
Is sprayed in the direction of travel. As a result, it is possible to reliably prevent the chips on the reference line drawn on the material during the cutting operation from being blown off by the air from the air pump 7 and hiding the reference line. Then, the saw blade 4 of the electric jigsaw 1 can be advanced along the reference line, and accurate material cutting can be performed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric jigsaw used for cutting materials such as wood, steel plates and resin plates.

[0002]

[Prior Art]

 Generally, an electric jigsaw is composed of a case with a built-in motor, a reciprocating shaft that is vertically movable in the case and reciprocates by the motor, and a saw blade provided at the tip of the reciprocating shaft. There is. In addition, the case contains a converter, a speed reducer, etc. that converts the rotary motion of the motor's rotary shaft into the vertical motion of the reciprocating shaft.

Here, by driving the motor, the rotary motion of the rotary shaft is converted into vertical motion of the reciprocating shaft by the vertical motion converting device and the speed reducing device, and the saw blade is vertically moved with respect to the material. Then, the material is cut when the saw blade is pulled up.

On the other hand, the chips generated from the material during the cutting operation have a drawback that they accumulate on the upper side of the material and the reference line delineating the cutting trajectory that the saw blade of the electric jigsaw is about to pass becomes invisible. In order to solve this drawback, an electric jigsaw with a dust suction adapter has been conventionally known. This dust suction adapter is connected to an external suction pump via a hose to suck the chips generated during cutting work.

[0005]

[Problems to be solved by the device]

 By the way, of the above-mentioned conventional electric jigsaws that do not have a dust suction adapter, the reference line that depicts the cutting trajectory during cutting work cannot be seen due to the chips, and must be cut exactly along the reference line. There is a problem that you cannot do it.

In addition, in the electric jigsaw with the dust suction adapter, there is a problem that the freedom of the electric jigsaw is impaired by the hose connecting the suction pump and the dust suction adapter provided outside, and an accurate cutting operation cannot be performed.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention surely prevents chips from accumulating on the cutting track during the cutting work, and enables accurate cutting work. The purpose is to provide an electric jigsaw.

[0008]

[Means for Solving the Problems]

 The features of the configuration adopted by the present invention to solve the above-mentioned problems are that the pump shaft is provided in the case so as to move up and down in conjunction with the reciprocating shaft, and the pump shaft protruding outside the tip side case and the case And a reciprocating air pump that discharges the air sucked from the suction port from the discharge port by reciprocating the pump shaft, one end side is connected to the discharge port of the air pump, and the other end side is It consists of a discharge pipe extending in the vicinity of the saw blade.

[0009]

[Action]

 With the above structure, when the reciprocating shaft is driven by the motor in the case and the cutting operation is performed by the saw blade, the reciprocating air pump is operated by using the vertical movement of the reciprocating shaft to operate from the discharge pipe. The discharged air can blow away the chips generated during cutting work.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

In the figure, 1 is an electric jigsaw according to the present embodiment, 2 is a case that forms the outer shape of the electric jigsaw 1, and the case 2 is a motor unit containing a motor (not shown) driven by an external power source. 2A, a device section 2B provided on the tip side of the motor section 2A and having an up-and-down motion converting device, a speed reducer (neither shown), and the like, and the device section 2B and the motor section 2A. And a grip portion 2C formed by the above.

Reference numeral 3 denotes a reciprocating shaft which is provided below the device portion 2B of the case 2 so as to be vertically movable. The reciprocating shaft 3 converts the rotational motion of the rotary shaft of the motor into a vertical motion converting device and a decelerating device. It operates as a reciprocating motion in the upward and downward directions through the device.

Reference numeral 4 denotes a saw blade, the base end side of which is attached to the tip end portion 3A of the reciprocating shaft 3, and a sawtooth portion 4A is formed on one end face toward the tip end side.

Reference numeral 5 denotes a guide plate attached to the lower side of the device portion 2B of the case 2 so as to cover the saw blade 4. The guide plate 5 is formed in a U shape, and the lower surface side is the upper surface of the material. It is a sliding contact surface 5A that comes into contact with and moves.

Reference numeral 6 denotes a pump shaft that is provided so as to project above the device unit 2B of the case 2, and the base end side of the pump shaft 6 is a vertical motion conversion device or a reduction gear in the device unit 2B. Is attached to the bottom portion 9C of the air chamber defining member 9 described later. The pump shaft 6 moves up and down as the reciprocating shaft 3 moves up and down.

Reference numeral 7 denotes a reciprocating air pump provided on the device portion 2B of the case 2, and the air pump 7 includes a pump housing 8 formed of a transparent resin material in a cylindrical shape with a lid, and the pump. An air chamber defining member 9 described later provided inside the housing 8 and a suction port 11 and a discharge port 12 formed in a lid portion 8A of the pump housing 8 are generally configured.

Reference numeral 9 denotes an air chamber defining member, which is made of a resin material or the like and has a bottomed tubular shape. The tubular portion 9A is formed in a bellows shape, and the opening 9B is formed as described above. The lid 8A of the pump housing 8 is airtightly fixed to the outer peripheral side thereof, and the center of the bottom 9C is fixed to the tip end side of the pump shaft 6. Further, since the air chamber 10 is formed in the air chamber defining member 9 and the tubular portion 9A is formed in a bellows shape, it can be easily contracted and expanded in the upward and downward directions, and the upper portion of the pump shaft 6 can be easily expanded. By the downward movement, the volume of the air chamber 10 can be made small at the time of contraction and made large at the time of expansion.

Reference numerals 11 and 12 denote a suction port and a discharge port formed in the lid portion 8 A of the pump housing 8. The suction port 11 is opened in the suction stroke in which the air chamber 10 is expanded, A suction valve 13 that closes in the discharge stroke in which the chamber 10 is contracted is attached. On the other hand, the discharge port 12 is provided with a discharge valve 14 that closes in the suction stroke when the air chamber 10 is expanding and opens in the discharge stroke when the air chamber 10 is contracting.

Reference numeral 15 denotes a discharge pipe made of a resin material. One end side of the discharge pipe 15 is connected to the discharge port 12 of the air pump 7 through a rubber joint part 16 and the other end side discharge part 15A. Extends in front of the saw blade portion 4A of the saw blade 4. Then, the discharge pipe 15 is fixed to the side surface of the device portion 2B of the case 2 by mounting metal fittings 17, 17.

The electric jigsaw according to this embodiment has the above-mentioned configuration, and the basic operation thereof is not different from that of the conventional art.

However, the pump shaft 6 of the air pump 7 of the electric jigsaw according to the present embodiment moves upward and downward by driving the motor as in the vertical movement of the reciprocating shaft 3, as shown in FIG. When the pump shaft 6 moves downward, the bottom portion 9C of the air chamber defining member 9 is pulled down, and the cylinder portion 9A extends so that the air chamber 10 expands. At this time, since the suction valve 13 is open and the discharge valve 14 is closed, the outside air is sucked into the air chamber 10 through the suction port 11.

On the other hand, when the pump shaft 6 moves upward, as shown in FIG. 3, the bottom portion 9C of the air chamber defining member 9 is pulled upward and the tubular portion 9A is contracted, so that the air chamber 10 is removed. to shrink. At this time, since the suction valve 13 is closed and the discharge valve 14 is opened, the air in the air chamber 10 is discharged from the discharge port 12 through the discharge pipe 15 and the discharge portion 15 A to the saw blade 4 of the saw blade 4. It can be sprayed in front of the saw blade 4A.

With this, the chips on the reference line drawn on the material can be blown off by the air from the air pump 7 during the cutting operation of the material, and the reference line drawn on the material can be cut off by the air from the air pump 7. By this, it can be prevented from being hidden and accurate cutting can be performed.

Thus, according to the present embodiment, a pump shaft 6 that is similarly moved up and down as the reciprocating shaft 3 to which the saw blade 4 is attached is moved up and down is provided. An air pump 7 having an air chamber defining member 9 that moves back and forth in a direction is attached to a case 2 of the electric jigsaw 1. Further, since the discharge air from the discharge port 12 of the air pump 7 is blown in the traveling direction of the saw blade 4 through the discharge pipe 15, the chips on the reference line drawn on the material at the time of cutting work are air pumped. It is possible to reliably prevent the reference line from being hidden by being blown off by the air from 7. Then, the saw blade 4 of the electric jigsaw 1 can be advanced along the reference line, and the material can be cut accurately.

Further, as described in the prior art, a hose that connects the case of the electric jigsaw and the external suction pump unlike the electric jigsaw with the dust suction adapter is not required, and the restriction of freedom by the hose can be prevented. , The cutting work can be easily performed.

Further, in the electric jigsaw 1 of the present embodiment, the pump shaft 6 is moved upward and downward by utilizing the vertical movement of the saw blade 4 as it is, so that another power source is not required and dust is absorbed. Power consumption can be reduced compared to an electric jigsaw with an adapter.

In the above embodiment, the motor of the electric jigsaw 1 is described as being driven by an external power source. However, the present invention is not limited to this, and a battery type electric motor having a charging mechanism built in the case 2 is used. Of course, it may be used in a jigsaw.

Further, although the air pump 7 of the above-described embodiment has the outer shape formed by the pump housing 8 which is made of a transparent resin material and has a cylindrical shape with a lid, the present invention is not limited to this, and instead of the pump housing 8, It may be configured by a plurality of columns and a disc-shaped lid provided on the upper side of each column.

Further, although the discharge pipe 15 is formed of a resin material, it may be formed of a metal material and a throttle may be formed in the discharge portion. In this case, the discharge air from the air pump 7 may be formed. The pressure can be applied to the chips, and the chips can be blown out more effectively.

On the other hand, in the above-mentioned embodiment, the moving speed of the pump shaft 6 is described as being the same as the moving speed in the upward and downward directions of the reciprocating shaft 3, but the present invention is not limited to this, and the case It is also possible to convert the moving speed of the pump shaft 6 into a speed different from the moving speed of the reciprocating shaft 3 and discharge the air by means of a transmission built in the device 2B of No. 2 above.

[0031]

[Effect of the device]

 As described above in detail, according to the present invention, a pump shaft that also moves up and down in accordance with the vertical movement of the reciprocating shaft provided with the saw blade is provided so that the tip side projects from the case of the electric jigsaw. Is provided with a reciprocating air pump that reciprocates by the pump shaft, and the discharge pipe is arranged so that the discharge air from the discharge port of the air pump extends in the vicinity of the saw blade. It is possible to reliably prevent the reference line from being hidden by blowing off the chips on the reference line drawn on the material during cutting work with the air from the air pump. As a result, the saw blade of the electric jigsaw can be advanced along the reference line, and the material can be cut accurately.

Further, like the electric jigsaw with the dust suction adapter, the hose that connects to the external suction pump can be eliminated, and the freedom of cutting work is not restricted and the workability can be improved. it can.

[Brief description of drawings]

FIG. 1 is a perspective view of an electric jigsaw according to an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part showing an air suction stroke of the air pump according to the present embodiment.

FIG. 3 is a cross-sectional view of essential parts showing an air discharge stroke of the air pump according to the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric jigsaw 2 Case 2A Motor part 2B Device part 2C Grip part 3 Reciprocating shaft 4 Saw blade 6 Pump shaft 7 Air pump (reciprocating air pump) 8 Pump housing 9 Air chamber defining member 10 Air chamber 11 Suction port 12 Discharge port 15 Discharge pipe

Claims (1)

[Scope of utility model registration request] 1. An electric jigsaw comprising a case containing a motor, a reciprocating shaft provided in the case so as to be movable up and down and reciprocating by the motor, and a saw blade provided at a tip of the reciprocating shaft. In the above, the pump shaft is provided on the case so as to move up and down in conjunction with the reciprocating shaft, and the pump shaft is provided on the case with the tip side protruding outside the case. A reciprocating air pump that discharges the air sucked from the mouth from the discharge port, and a discharge pipe that has one end connected to the discharge port of the air pump and the other end that extends in the vicinity of the saw blade. An electric jigsaw.