JP2009143129A - Bench cutting machine and dust collector for bench cutting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bench cutting machine provided with a dust collector that is removably attached to the bench cutting machine and runs only when the bench cutting machine is operated. <P>SOLUTION: To the cuttings discharging port of the circular saw part 12 of the bench cutting machine there is fitted the attachable/detachable dust collector 37 and the proximity switch 43 is installed for the dust collector 37. On the back of the circular saw part holder there is fixed the tube 45 that can freely be changed in its shape and keep that condition, and its tip is fitted to the actuator 44. When the circular saw part 12 is pushed down at cutting, the proximity switch 43 and actuator 44 separate, the proximity switch 43 turns ON and the dust collector 37 operates. When the circular saw part 12 is pushed up, the proximity switch and the actuator 44 are put into contact, the proximity switch 43 comes in a state of being OFF, and the dust collector 37 stops. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tabletop cutting machine, and more particularly to a tabletop cutting machine provided with a detachable dust collecting device.

  As a conventional dust collection method for a tabletop cutting machine, a dust collection path 12a is formed in a part of the gear case 20 of the tabletop cutting machine as shown in FIG. 6, and dust collection that can be attached to and detached from a chip discharge port 12b that continues from the chip guidance path 12a. A method is known in which a bag 42 is attached and chips generated by cutting are housed in a dust collection bag 42 by utilizing the force of the wind caused by the rotating saw blade 14 from the inner peripheral side to the outer peripheral direction.

  As another method, there is a method in which a hose of an external dust collector (not shown) is connected to the chip discharge port 12b instead of the dust bag 42 in FIG. 6, and chips are forcibly sucked by the dust collector.

Further, as disclosed in Japanese Patent Publication No. 2000-246703, a configuration is disclosed in which chips generated during cutting are forcibly discharged from a chip guide path by a fan from a chip discharge port by incorporating a fan into the chip guide path.
JP 2000-246703 A

  When another dust collector is prepared separately from the tabletop cutter, a place for installing the dust collector is required. Also, except for dust collectors that detect the current when the tabletop cutting machine is activated and have an interlocking function, the switch must be manually turned ON / OFF in accordance with the operation of the tabletop cutting machine, or must always be operated. .

  On the other hand, the tabletop cutting machine according to the above-mentioned Japanese Patent Publication No. 2000-246703 must incorporate a dust collector at the time of manufacture, and cannot be applied to the conventional tabletop cutting machine as shown in FIG.

  The object of the present invention has been made in view of the above-described background. A small dust collector can be attached to and detached from a chip discharge port of a tabletop cutting machine, and the dust collector is operated only when the tabletop cutting machine is in operation. It is to provide a tabletop cutting machine equipped with a dust collector with a proper switch function.

  The purpose is to provide a circular saw part for rotating the circular saw blade and a base part for placing the workpiece, and the wind generated by the rotation of the circular saw blade together with the chips on the circular saw part. In a vertically swinging tabletop cutting machine having a chip guide path for guiding in a predetermined direction and a chip discharge port for discharging wind and chips from the chip guide path, a fan, a suction port, and a discharge port rotated by a motor Is achieved by detachably connecting the dust collecting device provided with the chip discharge port. This dust collector detects the downward movement of the circular saw portion and drives the motor. For this purpose, a contact switch for turning ON / OFF the power of the dust collector is provided at one end of the dust collector, and an arm-like member having an actuator is attached to the circular saw holder of the tabletop cutting machine. Is turned ON / OFF.

  When the circular saw is at the uppermost position, the contact switch contacts the actuator and the contact switch is turned off.When the circular saw moves downward from the uppermost position, the actuator is separated from the contact switch. The contact switch turns on.

  The circular saw part and the circular saw part holder can be tilted to the left and right with respect to the upper surface of the base part, and the arm-like member is fixed to the circular saw part holder that tilts together with the circular saw part. Works regardless of the left / right tilt of the. The arm-shaped member is made of a deformable member, and can be constituted by, for example, a tube made of an aluminum alloy.

  The basic configuration of the present invention can also be applied to a method for controlling the power source of an external dust collector. Therefore, a flexible hose having a connecting pipe at the tip is connected to the chip discharge port of the tabletop cutting machine, and the connecting pipe is provided with a contact switch connected to the power cord connected to the power cutoff control unit of the dust collector. An arm-like member is fixed to the circular saw part holder of the tabletop cutting machine, and a contact switch is provided at the tip of the arm-like member. When the contact switch is in contact with the actuator, the switch of the external dust collector is turned on, and when the contact switch is separated from the actuator, the switch of the external dust collector is turned off.

  According to the present invention, it is possible to provide a tabletop cutting machine provided with a dust collector that can be attached to and detached from a chip discharge port of a tabletop cutting machine and that is operated only when the tabletop cutting machine is operated. it can.

  An embodiment of the present invention will be described with reference to FIGS. 1 is a side view showing a tabletop cutting machine according to an embodiment, FIG. 2 is a front view thereof, FIG. 3 is a top view thereof, FIG. 4 is a cross-sectional view taken along line AA ′ of FIG. It is a side view which shows the state at the time of cutting | disconnection.

  1, 2, and 3, the tabletop cutting machine has a turntable 2 embedded in the vicinity of the center of the horizontal surface of the base 1, and the turntable 2 can freely rotate at an angle of 45 degrees on the horizontal plane, for example. And the upper surface thereof is flush with the upper surface of the base 1. On the upper surface of the base 1 and the turntable 2, a processing material 35 to be cut such as wood is placed. In the present invention, the members (the base 1 and the turntable 2 in the present embodiment) on which the workpiece 35 is placed are collectively referred to as “base portion”. A fence 3 for supporting the side surface of the workpiece 35 is provided on the upper surface of the base 1. A holder 5 serving as a support member is erected on the rear end of the turntable 2 via the holder shaft 4, and the holder 5 is arranged so that the axis of the holder shaft 4 substantially coincides with the upper surface of the turntable 2. The holder shaft 4 is pivotally supported with respect to the upper surface of the turntable 2 so as to be tiltable left and right.

  As shown in FIG. 1, the turntable 2 has a holder support surface 2a at the rear. The holder 5 supports the support 28 at the rear part thereof, and the lever 6 is inserted from the upper part of the support 28 and screwed into the slider 29. By rotating the lever 6, the slider 29 is slidably held. When the lever 6 is rotated and the slider 29 is slid upward, the holder 5 is slightly moved toward the turntable 2 by the inclined surface 28a of the support 28 and the inclined surface 29a of the slider 29, so that the holder support surface 2a and the holder 5 are moved. It adheres and the tilting of the holder 5 is fixed. The holder 5 is configured to be able to tilt about 45 degrees to the left and right.

  In a state of right-angle cutting (a state in which the holder 5 is erected at a right angle to the turntable 2), the guide bar 7 is parallel to the upper surface of the turntable 2 and vertically in parallel. Two guide bars 7 (FIG. 3) serving as sliding members are fixed above the holder 5, and a support 9 (FIG. 3) for supporting the guide bar 7 is provided at the front end of the guide bar 7. Between the holder 5 and the support 9 of the guide bar 7, two through holes 8 a (FIG. 2) are formed, and a sliding holding member (not shown) is provided in the through hole 8 a, and the through hole 8 a of the circular saw holder 8 is provided. Two guide bars 7 serving as sliding members are inserted through the inside. There is a knob 10 on the side surface of the circular saw holder 8, and its sliding can be fixed by pressing the guide bar 7.

  A shaft 11 (FIG. 1) is provided at a position below the guide bar 7 of the circular saw holder 8, thereby supporting the circular saw portion 12, and the circular saw portion 12 is vertical with respect to the base 1. Can be swung freely. Between the circular saw part holder 8 and the circular saw part 12, a spring 13 for biasing the circular saw part 12 upward is provided.

  The circular saw portion 12 rotatably supports a saw blade shaft 15 having a gear 16, and the saw blade 14 is fixed to the saw blade shaft 15. A pinion (not shown) that meshes with the gear 16 and a pulley shaft 17 on which a pulley 18 is fixed are provided above the saw blade shaft 15. Further, the circular saw portion 12 includes a saw cover 19 and a gear case 20 that cover the lower half of the saw blade 14, a motor portion 21 that rotationally drives the saw blade 14, a motor shaft 22 of the motor portion 21, and a motor shaft 22. A transmission belt 24 for transmitting the power of the motor unit 21 to the pulley 23 and the lower pulley 18 held at the right end of the motor, a motor housing 25 (FIG. 2) for covering and supporting the motor unit 21 and the motor shaft 22, and a handle 26 at the front end. Consists of including. The motor housing 25 is disposed on the outer peripheral side of the saw blade 14 and in a direction substantially perpendicular to the extended surface of the saw blade 14 so that the motor housing 25 travels from both sides in the axial direction of the saw blade 14. Provided. The gear case 20 of the circular saw portion 12 is provided with a chip guide path 12a and a chip discharge port 12b at the tip thereof.

  As shown in FIG. 2, stoppers 5 a and 5 b that serve as positioning members at the time of tilting are provided on the side surface of the holder 5, and the upper surface of the turntable 2 is tilted so as to be positioned on the movement trajectory of the stoppers 5 a and 5 b. Stopper bolts 30 and 31 as adjustment members are screwed in the vertical direction. When the holder 5 is tilted, the stoppers 5a and 5b come into contact with the heads of the stopper bolts 30 and 31 at a predetermined tilt angle, and the tilt position of the circular saw portion 12 is set. The stopper bolt 30 is provided, for example, so as to engage with the stopper 5a when the holder 5 is inclined at a 45 degree position in the left direction. Further, the stopper bolt 31 is provided so as to be engaged with the stopper 5b when the holder 5 is inclined to a position of 45 degrees in the right direction, for example. Further, a through hole 2b is provided in the upper part of the turntable 2, and a pin 32 serving as a positioning member at a right angle is pivotally supported so as to be horizontally movable back and forth. When the pin 32 is positioned in FIG. The stopper bolt 33 is screwed in the vertical direction so as to be positioned above. When the holder 5 is perpendicular to the turntable 2 (at a right angle cutting position), the tip of the stopper bolt 33 and the outer diameter portion of the pin 32 come into contact with each other.

  In FIG. 3, a blade mouth plate 34 having a groove 34 a into which the saw blade 14 enters the center is fixed on the upper surface of the turntable 2, and when the workpiece 35 is cut, the lower end of the saw blade 14 is placed on the turntable 2. When it descends from the upper surface, it penetrates into the groove 34a of the blade plate 34 and plays the role of preventing the workpiece 35 from standing on the finished surface.

  Next, the structure of the dust collector 37 will be described with reference to FIG. 4 showing a cross-sectional view of the A-A ′ portion of the tabletop cutting machine of FIG. 1. The dust collecting device 37 has a suction port 38 and a discharge port 39, and a dust collecting fan 41 attached to a rotating shaft of a fan motor 40 (detailed structure not shown) is freely rotatable between the front side and the opening. Is held in. This dust collecting fan 41 is generally called a radial fan, and as shown by the arrows in the figure, air is sucked from the front side of the dust collecting fan 41 and an air flow is generated to discharge the air toward the outer periphery of the fan. Let The suction port 38 of the dust collector 37 can be fitted to the chip discharge port 12b provided in the circular saw part 12 of the tabletop cutting machine, and is detachable. A removable dust bag 42 is attached to the discharge port 39. As shown in FIG. 1, a proximity switch 43 such as a micro switch or a magnet switch is provided below the dust collector 37.

  The actuator 44 for operating the proximity switch 43 is a cylindrical member, and the surface that contacts the proximity switch 43 is a flat surface. The actuator 44 is fixed to the circular saw holder 8 by a clip, a magnet, an adhesive, or the like via a tube 45 that can be freely changed in shape and maintained in that state. The tube 45 is an arm-shaped member made of a deformable material, and is made of, for example, a metal such as an aluminum alloy or copper so that the shape does not easily deform during use. Further, the tube 45 may be constituted by an articulated arm that can be fixed in an arbitrarily bent state. The proximity switch 43 is turned on when the actuator 44 is separated and turned off when the actuator 44 comes into contact. Therefore, since the tube can be deformed according to the cutting operation, the operation is not disturbed. Further, since the tube is made of metal, it can be prevented from being deformed during work.

  When the proximity switch 43 is turned ON / OFF, the fan motor 40 of the dust collecting device 37 is driven, and the dust collecting fan 41 rotates. The power source for driving the fan motor 40 may be obtained from a power outlet or may be driven by a rechargeable battery. In order to prevent an increase in the number of wires, the wires may be branched from the power supply path to the motor unit 21 when the power outlet is used.

  What is important here is that the power source of the dust collector 37 is not turned ON / OFF in conjunction with the switch 27 (FIG. 1), but is linked to the moving operation in which the circular saw 12 is lowered from the upper limit position. Thus, the proximity switch 43 is turned ON / OFF. If comprised in this way, a dust collection mechanism can be added only by attaching the dust collector 37, the proximity switch 43, the actuator 44, and the tube 45 to the conventional tabletop cutting machine as shown in FIG. Further, since the dust collector is driven only during cutting work with a simple configuration, energy saving and noise reduction can be achieved.

  In the above configuration, in order to set the circular saw portion 12 in the vertical position and cut the workpiece 35 at a right angle, when the holder 5 is in the vertical position, the pin 32 is moved forward and the stopper bolt 33 which is an inclination adjusting member. The tip of the pin 32 and the outer diameter portion of the pin 32 are brought into contact with each other, the lever 6 is tightened, and the inclined position of the holder 5 can be fixed and cut. In order to cut the workpiece 35, when the switch 27 provided on the handle 26 is pressed and the motor unit 21 is driven to rotate, the saw blade 14 rotates via the saw blade shaft 15. In this state, the handle 26 is held and the circular saw portion 12 is pushed down against the urging force of the spring 13 to cut the workpiece 35. At this time, since the proximity switch 43 and the actuator 44 are separated as shown in FIG. 5, the proximity switch 43 is turned on, the fan motor 40 is driven, and the dust collecting fan 41 rotates. Due to the rotation of the dust collecting fan 41, a powerful airflow that flows from the chip guide path 12 a to the discharge port 39 is generated. The direction of the airflow generated in the vicinity of the chip guide path 12a is as shown by an arrow in FIG. 5, but the portion indicated by the thick arrow is combined with the wind generated by the rotational force of the saw blade 14 to generate a stronger airflow. It shows that it occurs.

  Chips generated by cutting the workpiece 35 are sucked from the chip discharge port 12 b by the air flow generated by the rotation of the dust collection fan 41, discharged from the discharge port 39, and stored in the dust collection bag 42. The dust collection bag 42 is a cloth bag, for example, and allows air to pass therethrough and swarf chips inside. When the saw blade 14 is pushed down until the saw blade 14 enters the groove 34a of the blade plate 34 and the cutting of the workpiece 35 is completed, when the handle 26 is lifted up, the circular saw portion 12 moves to the spring 13. When the actuator 44 is returned to the original upper limit position by the urging force and the actuator 44 contacts the proximity switch 43, the proximity switch is turned OFF and the fan motor 40 is stopped.

  When the angle is cut, the turntable 2 is rotated and the workpiece 35 is cut by the same cutting method as described above. Since the relative positional relationship between the proximity switch 43 and the actuator 44 does not change during this tilt cutting, the proximity switch 43 acts in the same manner. When the handle 26 is lowered, the proximity switch 43 is turned ON, and the handle 26 is returned to the original position. When the position returns to the position, the proximity switch 43 is turned OFF.

  Next, a method for tilting the circular saw portion 12 from side to side will be described. The lever 6 is loosened to release the fixed state of the holder 5 and the holder 5 is tilted leftward or rightward. At this time, since the center of gravity of the motor portion 21 is located almost directly above the holder shaft 4, the circular saw portion 12 can be inclined with a substantially constant force on either the left side or the right side. When the lever 6 is loosened to release the fixed state of the holder 5 and the holder 5 is tilted to the left, the stopper 5a comes into contact with the stopper bolt 30 and the circular saw portion 12 is positioned in a state of 45 degrees to the left. In this state, the lever 6 is tightened to fix the inclined position of the holder 5. After that, the workpiece 35 is cut by the cutting method described above.

  Furthermore, when cutting a wide workpiece by right angle cutting, angle cutting, or inclined cutting, after pressing the workpiece 35 against the surface of the fence 3 and fixing it, the knob 10 is loosened and the handle 26 closes the front side (see FIG. 1). When pulled in the right direction), the circular saw holder 8 and the circular saw 12 move together to move forward. After the handle 26 is pushed down and a cut is made, cutting is performed while sliding the circular saw portion 12 backward (state of FIG. 5). If the force pushed down is weakened after cutting, the circular saw portion 12 is pushed upward by the spring 13.

  If the shape of the discharge port 39 of the dust collector 37 is the same as the chip discharge port 12b including the outer diameter, the dust collection bag used for the chip discharge port 12b of the tabletop cutting machine is directly attached to the discharge port 3. Can be used.

  If a long hose is connected instead of the dust bag 42 and a commercially available garbage bag is placed under the opposite hose end, the dust bag can also be collected directly. Moreover, it is also possible to use another dust collector in combination without using the small dust collector 37.

  This second embodiment will be described with reference to FIGS. Although the details of the external dust collector 50 are not specified here, they are well-known devices as described in, for example, Japanese Patent Application Laid-Open Nos. 2000-246672 and 2002-326119. The external dust collector 50 is, for example, a floor-standing type in which a shrinkable hose 51 is attached, and a tip end of the external dust collector 50 is provided with a connect pipe 52 so as to fit a chip discharge port of an electric tool or the like. In FIG. 7, the connect pipe 52 is directly fitted into the chip discharge port 12b. A proximity switch 53 is attached to the connect pipe 52. The proximity switch 53 is turned on when the actuator 44 is separated and turned off when the actuator 44 comes into contact.

  A tube 45 that can be freely changed in shape and maintained in its state is attached to the back surface of the circular saw holder 8 of the tabletop cutting machine, and an actuator 44 is attached to the tip of the tube 45. The tube 45 can be fixed to the circular saw holder 8 by any method such as adhesion or screwing. From the proximity switch 53 to the external dust collector 50, a power cord 54 is provided along the retractable hose 51. The power cord 54 may be integrated with the hose 51, or a cover (not shown) for covering the hose 51 is attached to the outer peripheral side of the hose 51, and the power cord 54 is placed inside the cover. It may be arranged. Further, the power cord 54 may be installed separately from the hose 51.

  FIG. 9 is a power supply circuit diagram of the external dust collector 50. In the external dust collector 50, a power source such as a commercial power source is ON / OFF controlled by the proximity switch 53, whereby the motor M of the external dust collector 50 rotates.

  In FIG. 7, the handle 26 is held and the circular saw portion 12 is pushed down against the urging force of the spring 13 to cut the workpiece 35. At this time, since the proximity switch 53 and the actuator 44 are separated as shown in FIG. 7, the proximity switch 53 is turned on, the external dust collector 50 is driven, and a strong dust suction force is generated via the hose 51. As shown in FIG. 8, the relative positional relationship between the proximity switch 53 and the actuator 44 does not change even when the circular saw 12 is slid in the front-rear direction and swung in the up-down direction. Therefore, the switch remains ON. Therefore, in the second embodiment, the external dust collector is driven only during cutting work with a simple configuration, so that energy saving and noise reduction can be achieved.

  As mentioned above, although this invention was demonstrated using the embodiment, this invention is not limited to this, A various deformation | transformation is possible in the range which does not deviate from the meaning. For example, the proximity switch 53 and the actuator 44 may be of an optical switch type, in which case the light source and the sensor are attached to the dust collector side, and a blocking plate that blocks the optical path from the light source to the sensor is used as an actuator. Just attach to the tip. In addition, other switches such as a known mechanical detection switch and a sensor type switch may be used. Further, the proximity switch may be turned ON / OFF in the opposite direction, and may be turned ON when contacting with the actuator, and turned OFF when separated.

The side view which shows one Embodiment of the tabletop cutting machine by this invention. The front view of the tabletop cutting machine shown in FIG. The top view of the tabletop cutting machine shown in FIG. Sectional drawing of the A-A 'part of the tabletop cutting machine shown in FIG. The side view which shows the state at the time of the cutting | disconnection of the tabletop cutting machine shown in FIG. The side view of the conventional tabletop cutting machine. The side view which shows 2nd Embodiment of the tabletop cutting machine by this invention. The other side view which shows the use condition of the tabletop cutting machine shown in FIG. The power circuit diagram of the external dust collector attached to the tabletop cutting machine by this invention.

Explanation of symbols

1 Base 2 Turntable
5 Holder
8 Circular saw part holder 12 Circular saw part 12a Chip guide path 12b Chip discharge port 14 Saw blade
35 Work material 37 Dust collector 38 Suction port 39 Discharge port 40 Fan motor 41 Dust collector fan 42 Dust collection bags 43, 53 ... Proximity switch 44 Actuator 45 Tube

Claims (8)

A circular saw part that rotates the circular saw blade and a base part on which the workpiece is placed,
The circular saw portion has a chip guide path for guiding wind generated by rotation of the circular saw blade together with chips in a predetermined direction, and a chip discharge port for discharging the wind and the chips from the chip guide path. Have
A tabletop cutting machine that cuts the workpiece by moving the circular saw blade up and down with respect to the base part,
A tabletop cutting machine characterized in that a dust collector equipped with a fan, a suction port, and a discharge port rotated by a motor is detachably connected to the chip discharge port.   2. The tabletop cutting machine according to claim 1, wherein a descent operation of the circular saw portion is detected to drive a motor of the dust collector. The dust collector has a contact switch for turning on / off the power supply,
An arm-like member having an actuator at one end is attached to the circular saw holder of the tabletop cutting machine,
When the circular saw portion is in the uppermost position, the contact switch contacts the actuator and the contact switch is turned off.
3. The tabletop cutting machine according to claim 2, wherein when the circular saw portion moves downward from the uppermost position, the contact switch is turned on when the actuator is separated from the contact switch. 4.   The circular saw part and the circular saw part holder can be tilted to the left and right with respect to the upper surface of the base part, and the arm-shaped member is fixed to a circular saw part holder that tilts together with the circular saw part. The tabletop cutting machine according to claim 3, wherein the tabletop cutting machine operates regardless of a left-right tilt of the base portion.   The tabletop cutting machine according to claim 4, wherein the arm-shaped member is made of a deformable member.   The tabletop cutting machine according to claim 5, wherein the arm-shaped member is a tube made of an aluminum alloy. A flexible hose having a connecting pipe for connecting to a chip discharge port of a tabletop cutting machine at the tip;
An arm-shaped member that is provided on the connecting pipe and is fixed to a circular saw part holder of a tabletop cutting machine that cuts a workpiece while swinging the circular saw blade up and down when connected to the chip discharge port. A contact switch that contacts the mounted actuator;
A dust collector connected to the other end of the flexible hose, having a power cord connected to the power cutoff control unit along the duct hose from the contact switch;
The dust collector is characterized in that when the contact switch is in contact with the actuator, the dust collector is turned on, and when the contact switch is separated from the actuator, the dust collector is turned off. The dust collector according to claim 7, wherein the contact switch is a micro switch or a magnet switch.

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