JPH0683223U - Electric cutting machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an electric cutting machine in which chips are not accumulated on a guide part of a rotary tool center position and a black wire on a work material during cutting. [Structure] The motor case 1 and the gear box 13 are adjacent to each other, and a discharge port 8 for discharging exhaust air after cooling the motor is formed in the adjacent portion. An exhaust air guide passage 20 is provided so as to cover the exhaust port 8 and guide the exhaust air to the rotary tool center position guide portion 5. The opening 25 of the exhaust air guide passage 20 is directed to the rotary tool center position guide portion 5 to blow off the chips accompanying the cutting of the work material, and to keep the rotary tool center position guide portion 5 and the black line on the work material at all times. Expose.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric cutting machine, and more particularly to an electric cutting machine capable of blowing dust accumulated on a work material or the like when the work material is cut and cutting the work material accurately along a black line.

[0002]

[Prior art]

 An example of a conventional portable electric cutting machine (Japanese Utility Model Laid-Open No. 4-54625) is shown in FIG. As shown in FIG. 7, a motor (not shown) having a cooling fan is arranged in a motor case 52 arranged on the surface plate 51, and is adjacent to the left side of the motor case 52. A gear cover 54 is provided to cover the gear box 53 that reduces the speed of the motor. A disk-shaped rotary tool (for example, a diamond wheel) 55 is fixed to the output shaft of the gear box 53, and the work piece 59 is previously attached to the work piece 59 on the extension line in the plane direction of the rotary tool 55. A rotary tool center position guide portion (hereinafter referred to as the inside of the rotary tool plan) 57 that serves as a guide for cutting along the black line (scored line) 56 is provided corresponding to the drawn black line (scored line). A discharge port 58 is formed adjacent to the motor case 52 and the gear cover 54 for discharging the wind to the outside after cooling the motor with the wind sucked by the fan. Reference numeral 60 is a handle.

[0003]

[Problems to be solved by the device]

 By the way, when cutting the work material, the rotary tool guide part is made to correspond to the black line drawn on the work material in advance, but a large amount of dust is generated at the time of cutting, and the dust is the rotary tool guide part. And the black line drawn on the work material is accumulated, and the rotary tool guide portion and the like are hidden. As a result, it is difficult to associate the rotary tool guide portion with the black line, and there is a problem that it is not possible to accurately cut along the black line.

Therefore, the present invention has been made to solve the above problems, and provides an electric cutting machine that can blow off dust even if dust is generated during cutting and cut accurately along a black line. The purpose is to

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention covers a motor case in which a motor having a cooling fan attached to an output shaft is housed, and a gear cover which covers a gear box for reducing the rotation speed of the output shaft of the motor. Are adjacent to each other, an air outlet for cooling the motor is formed at a position adjacent to the motor case and the gear cover, and a rotary tool is provided on a rotary output shaft of the gear box. In an electric cutting machine equipped with a rotary tool center position guide that serves as a guide for placing along the black line drawn in advance on the work material on the extension line of, the discharge port is The rotary tool is covered by an exhaust air guide passage for guiding the wind toward the rotary tool center position guide portion, and the wind exhaust guide passage is for rotating the rotary tool for blowing away dust accumulated due to cutting of the work material. With a opening formed toward the vicinity of heart position guiding portion.

[0006]

[Action]

 The rotary tool center position guide is made to correspond to the black line drawn on the work material in advance, and the motor is rotated to rotate the rotary tool to cut the work material. During this cutting, dust accumulates on the rotary tool center position guide and the black line. However, the fan is rotated by the rotation of the motor, and the exhaust air after cooling the motor is discharged from the discharge port. The exhaust air travels along the exhaust air guide passage and is blown from the opening to the rotary tool center position guide portion. Due to this spraying, the temporarily accumulated dust is blown off and the dust can be cut accurately along the black line.

[0007]

【Example】

 Hereinafter, the electric cutting machine according to the present invention will be described with reference to the embodiments shown in FIGS. Fig. 1 shows a plan view of an electric cutting machine for cutting concrete, etc., Fig. 2 shows a sectional view taken along the line II-II in Fig. 1, and Fig. 3 shows a sectional view taken along the line III-III in Fig. 1. Indicates.

As shown in FIGS. 1 to 3, a motor case 1 having a substantially cylindrical cross section is fixed on a substantially rectangular flat platen 4. Three ribs 1a to 1c (FIG. 2) for reinforcement are formed on the outside of the motor case 1 in the axial direction. In FIG. 3, a bearing 12 is fixed to the left end of the motor case 1, and an intake port 9 for sucking outside air is formed around the bearing 12. A motor 11 is disposed in the motor case 1, a left side portion 10a of a drive shaft 10 of the motor 11 is fitted into the bearing 12, and a cooling portion is provided at an intermediate portion of a right side portion 10b of the drive shaft 10. The fan 7 is fixed, a gear box (not shown) is arranged at the right end of the drive shaft 10, and the rotary tool 6 such as a diamond wheel is fixed to the output shaft of the gear box. In FIG. 1, on the upper left side edge of the surface plate 4, a linear rotary tool center position guide portion (rotary tool guide portion) 5 serving as a guide for cutting along the black line 19 drawn on the work material 18 is provided. Has been formed. The rotary tool guide portion 5 and the center of the rotary tool 6 in the plane direction are arranged on the same straight line.

The gear box is covered with a gear cover 13 (FIG. 3), the motor case 1 and the gear cover 13 are adjacent to each other, and the air (exhaust air) after cooling the motor 11 is provided in the adjacent portion. Is formed (see the hatched portion in FIG. 1 and FIGS. 2 and 3). A safety cover 2 for covering the rotary tool 6 is disposed on the right side of the gear cover 13 in FIG.

An exhaust air guide passage 20 is provided so as to cover the exhaust port 8 and guide the exhaust air to remove dust accumulated on the black wire 19 and the like during cutting. As shown in FIG. 4, the exhaust air guide passage 20 has a longitudinal U-shaped cross section and an outer shape of a substantially arc. That is, in the exhaust air guide passage 20, the passage 21 is formed by the guide walls 24a and 24b provided on both sides, and the passage 22 is formed by the left guide walls 24b and 24c. A passage 26 is formed in a projecting manner on the front side surface of the lower end portion of the guide wall 24c by the guide walls 24d and 24e, and the opening 25 thereof is directed to the rotary tool guide portion 5 (FIG. 1). The end face portion 24f of the exhaust air guide passage 20 is formed so as to be in close contact with the outer periphery of the motor case 1, the gear cover 13 and the upper surface of the surface plate 4. Further, U-shaped grooves 23, 23 are formed in the guide walls 24a, 24b, and the rib 1a of the motor case 1 is fitted into the grooves 23, 23. The cross-sectional shape of the exhaust air guide passage 20 in the longitudinal direction is not limited to the inverted U shape, and may be any shape as long as the portion corresponding to the exhaust port 8 is open.

FIG. 5 is a side view including a partial cross section when the exhaust guide passage 20 having such a configuration is attached to an electric cutting machine and viewed in the VV direction in FIG. In FIG. 5, the shaded portion is the side surface of the exhaust air guide passage 20.

A handle 14 is fixed to a substantially central portion of the motor case 1, and a switch 15 for turning on / off a power source is attached to the inside of the handle 14. Further, in FIG. 1, reference numeral 31 at the lower left is a cutting depth adjusting screw, and reference numeral 32 at the lower right is a power cord.

Next, the operation of the electric cutting machine will be described. As shown in FIG. 1, a black line 19 is drawn on the work material 18 in advance. Then, the tip 5a of the rotary tool guide portion 5 of the electric cutting machine is brought into contact with the end 19a of the black wire 19 to position the rotary tool 6 with respect to the black wire 19. Then, the switch 15 inside the handle 14 is inserted to bring the rotary tool 6 into a rotating state (direction of arrow C in FIG. 2, clockwise rotation). Then, in FIG. 1, while aligning the guide portion 5 of the electric cutting machine with the black line 19, the electric cutting machine is moved upward in FIG. 1 to cut the work material 18. Due to this cutting, chips are accumulated on the guide portion 5 and the black line 19.

However, as shown in FIGS. 2 and 3, the fan 7 rotates in the direction D (counterclockwise) in FIG. 2 by the rotation of the motor 11, and the cooling air is sucked from the suction port 9 (FIG. 3). Now, the motor 11 is cooled and proceeds to the right. This cooling air is blown out from the exhaust port 8, successively passes through the passages 21, 22 and 26 (FIG. 2) of the exhaust air guide passage 20, and is blown out from the opening portion 25. Since the opening 25 is opened toward the guide portion 5 (FIG. 1), the chips on the black line 19 in the guide portion 5 and the vicinity thereof are blown off.

Therefore, even if the cutting chips are temporarily accumulated on the guide portion 5 or the like due to the cutting of the work material 18, they are surely blown off, so that an accurate cutting operation can always be performed. Since the exhaust guide passage 20 of this embodiment can be easily attached to the conventional electric cutting machine, it is not necessary to make a large design change of the conventional electric cutting machine.

Further, in the conventional electric cutting machine, the exhaust air blows on the operator's face or the like (FIG. 7) and gives the operator an uncomfortable feeling. However, if the exhaust air guide of the present embodiment is attached, the opening portion Exhaust air is guided only to 25, so there is no discomfort to the operator.

Furthermore, although the electric cutting machine for concrete cutting has been described in the present embodiment, it is needless to say that the present invention can be applied to a wood cutting machine such as an electric circular saw. Furthermore, in this embodiment, the case where the rotary tool rotates in the clockwise direction is shown (arrow C in FIG. 2), but when the rotary tool rotates in the counterclockwise direction, in the right end portion of the surface plate 4 in FIG. An opening for the exhaust guide may be provided.

[0018]

[Effect of device]

 According to the present invention, since the cooling air for cooling the motor is guided by the exhaust guide to the rotary tool guide portion, the chips temporarily accumulated in the vicinity of the guide portion are blown away, and the guide portion is always provided. The black and black lines are exposed, and accurate cutting work can be performed.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which a work material is being cut by an electric cutting machine according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a perspective view of an exhaust guide according to a main part of the present invention.

FIG. 5 is a side view of a main part when the exhaust guide is attached to an electric cutting machine.

FIG. 6 is a side view of the embodiment.

FIG. 7 is a plan view of a conventional electric cutting machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Motor case 4 ... Surface plate 5 ... Rotating tool center position guide part 6 ... Rotating tool 7 ... Fan 8 ... Exhaust port 9 ... Suction port 11 ... Motor 19 ... Black line 20 ... Exhaust guide passages 21, 22, 26 ... Cooling Wind passage 25 ... Opening

Claims (1)

[Scope of utility model registration request] 1. A motor case in which a motor having a cooling fan attached to an output shaft is housed, and a gear cover for covering a gear box for reducing the rotational speed of the output shaft of the motor are adjacent to each other, and the motor case and An outlet for air after cooling the motor is formed at a position adjacent to the gear cover, and a rotary tool is provided on the rotary output shaft of the gear box, and the rotary tool is provided on the extension line of the rotary tool in the plane direction on the work material. In an electric cutting machine equipped with a rotary tool center position guide that serves as a guide for arranging along a black line drawn in advance, the outlet has a wind after motor cooling of the rotary tool center position guide. Is covered with an exhaust air guide passage for guiding in a direction, and the exhaust air guide passage is directed toward the vicinity of the rotary tool center position guide portion in order to blow away dust accumulated due to cutting of the work material. Electric cutting machine, characterized in that it comprises a mouth are openings.