JP5313077B2 - Tabletop cutting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure smooth action of a movable cover by attaining dust-prevention of a link plate since there is risk that failure of action is generated by the fact that a cutting powder is especially deposited in a guide groove of the link plate conventionally when the link plate for opening/closing the movable cover for covering a lower side of a rotation blade while interlocked with a cutting body machine is included in a bench cutting machine. <P>SOLUTION: A shielding plate 110 is arranged between the link plate 100 arranged along a side wall 11b of a body case 11 and the rotation blade 12. Thereby, the cutting powder rolled up from a cutting portion toward a dust-collection port 105 is not blown to the guide groove 100b of the link plate 100. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a tabletop cutting machine in which, for example, a cutting machine body having a rotary blade such as a circular grindstone or a saw blade is moved downward to cut a cutting material.

This type of tabletop cutting machine includes a table for placing a cutting material on the upper surface, and a cutting machine body that is supported above the table and tilts up and down. The cutting machine rotates while rotating the rotary blade. Cutting is performed by lowering the main body and cutting into a cutting material fixed on the table.
The rotary blade of the cutting machine main body is covered with the main body case in the upper half circumference range and the lower half circumference range with the movable cover. Normally, the movable cover is opened and closed in conjunction with the vertical movement of the cutting machine main body. It has a configuration that. When the cutting machine body is moved downward, the movable cover is opened to expose the lower side of the rotary blade, and this exposed portion is cut into the cutting material.
Conventionally, a technique for interlocking the opening / closing operation of the movable cover with the vertical operation of the cutting machine body is disclosed in, for example, the following patent documents. In the technique disclosed in this patent document, a link plate is used. The link plate is interposed between the main body case and the support side. A guide groove is provided in the link plate, and a guide pin provided in the main body case is inserted into the guide groove so that the guide groove functions as a cam groove. When the link plate is displaced along a certain path in conjunction with the downward movement of the cutting machine body, the movable cover is pushed to the opening side at the front end of the link plate.

Japanese Patent No. 2627192

In such a conventional movable cover interlocking mechanism, since the link plate is disposed in the main body case that covers the upper half circumference of the rotary blade, the cutting powder generated from the cutting site by the cutting operation is scattered and the link plate and the guide groove. Sprayed around. For this reason, cutting powder accumulates in the guide groove and the relative movement of the guide pin is hindered. As a result, the movable cover may not be opened and closed smoothly.
The present invention has been made to solve the conventional problems, and has improved the link plate for interlocking the opening and closing of the movable cover with the vertical movement of the cutting machine body and the dustproof function of the periphery thereof, thereby It is intended to maintain a smooth opening / closing operation over a long period of time.

For this reason, this invention was set as the tabletop cutting machine of the structure described in each claim of a claim.
According to the tabletop cutting machine of claim 1, since both sides of the link plate are shielded by the shielding plate in the main body case, the cutting powder wound up in the main body case by the rotation of the rotary blade is directed to the link plate side. It is prevented from being sprayed. For this reason, as a result of preventing cutting powder from adhering or accumulating on the guide groove provided on the link plate and the guide pin engaged with the link plate, the smooth operation state of the link plate is maintained. Smooth opening / closing operation of the movable cover is maintained for a long period of time.
According to the tabletop cutting machine of the second aspect, the link plate is disposed in the main body case between the side wall of the main body case and the shielding plate and shielded from the cutting powder, thereby preventing dust. By making the side wall of the main body case function also as a shielding plate, the dustproof effect can be enhanced with a simpler configuration.
According to the tabletop cutting machine of the third aspect, since the cutting powder is prevented from falling on the link plate from above in the main body case, the dustproof effect can be further enhanced.
According to the tabletop cutting machine of the fourth aspect, by using the side wall of the main body case and the stepped portion on the upper side, it is possible to obtain a high dustproof effect while minimizing additional parts.

It is a side view of the whole tabletop cutting machine concerning the embodiment of the present invention. In this figure, the user is located on the right side of the tabletop cutting machine. It is (II) arrow directional view of FIG. 1, Comprising: It is a top view of the whole desktop cutter. It is the rear view which looked at the cutting machine main body from the arrow (III) direction in FIG. In this figure, the rear part of the blade case is shown in a longitudinal section. It is a perspective view of a handle part and a motor housing. This figure is shown with the controller case lid and baffle plate removed. It is a perspective view of a handle part and a motor housing. This figure is shown with the controller case lid and baffle plate attached. It is a perspective view of the baffle plate which provided the lid | cover of the controller case integrally. It is a cross-sectional view along the motor axis of the electric motor alone. It is the right view which looked at the cutting machine main body from the arrow (VIII) direction in FIG. In this figure, the user is located on the left side of the cutting machine body. FIG. 9 is a cross-sectional view taken along line (IX)-(IX) in FIG. 8 and is a vertical cross-sectional view of the cutting machine body. It is the figure which looked at the inside of a cutting machine main body from the right side. This figure is shown with the movable cover closed. It is the figure which looked at the cutting machine main body from the lower side in the arrow (XI) direction in FIG. This figure is shown with the movable cover closed. It is the figure which looked at the inside of a cutting machine main body from the right side. It is the figure which looked at the cutting machine main body from right below. In this figure, the main body case is shown in cross section. It is the figure which looked at the rear part of the main body case, and dust collection opening | mouth vicinity from right under. It is the (XV)-(XV) line arrow figure of FIG. This figure is the simplified view which looked at the inside of the rear part of a main part case from the front side toward a dust collection mouth.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG.1 and FIG.2 has shown the whole tabletop cutting machine 1 which concerns on embodiment. As shown in the drawing, a user H is located on the front side of the tabletop cutting machine 1. About the front-back direction, the left-right direction, and the up-down direction of the members or configurations described below, the user H is used as a reference. Each direction is also shown in the figure.
This tabletop cutting machine 1 includes a table 2 for fixing a cutting material W on the upper surface, a base 3 that supports the table 2 so as to be rotatable in a horizontal range within a certain angle range, and a rear portion of the table 2 (in FIG. 1). A main body support 4 provided at the left end) and a cutting machine main body 10 supported above the table 2 by the main body support 4 are provided.
A positioning fence 5 for positioning the cutting material W in the table surface direction is disposed on the upper surface of the table 2. The positioning fence 5 is supported between the auxiliary table portions 3a and 3a provided on the left and right side portions of the base 3 with a slight gap from the table upper surface, whereby the table 2 is rotated horizontally. Is allowed. The cutting material W positioned by the positioning fence 5 is fixed to the upper surface of the table 2 by a clamp device (not shown).
The main body support unit 4 includes two upper and lower slide mechanisms 7 and 6 that support the cutting machine main body 10 so as to be slidable in the horizontal direction with respect to the table 2, and left and right (see FIG. The tilt support mechanism 20 is tilted in a direction perpendicular to the paper surface. An inclined support mechanism 20 is supported on the rear part of the table 2 through the lower slide mechanism 6 so as to be slidable in the front-rear direction. The lower slide mechanism 6 includes two slide bars 6a and 6a arranged in parallel with a certain interval in the horizontal direction.
The cutting machine main body 10 is supported on the upper part of the main body support arm 21 of the inclined support mechanism 20 via the upper slide mechanism 7. The upper slide mechanism 7 includes two slide bars 7a and 7a arranged in parallel with a certain interval in the vertical direction. The front ends of the two slide bars 7a and 7a are connected to each other by a holder 7b. A cutting machine main body 10 is supported by a main body supporting slider 8 constituting the upper slide mechanism 7 via a main body tilting shaft 9 so as to be tiltable up and down. A torsion spring 9 a (see FIGS. 11 to 13) is attached to the main body tilting shaft 9. The cutting machine main body 10 is biased by the torsion spring 9a so as to tilt upward.
The cutting machine main body 10 is supported so as to be slidable in the front-rear direction (left-right direction in FIGS. 1 and 2) along the table surface direction via the upper and lower two-stage slide mechanisms 7 and 6. The sliding direction of the cutting machine body 10 by both the sliding mechanisms 7 and 6 is the cutting direction. Usually, the cutting material W is cut by sliding the cutting machine body 10 from the near side to the back side (from the right side to the left side in FIGS. 1 and 2).
In addition, it is possible to perform so-called tilt cutting by tilting the cutting machine body 10 to the right or left by a certain angle via the tilt support mechanism 20.
This embodiment has an unprecedented characteristic with respect to the configuration of the cutting machine body 10, and no other changes are required for the other configurations of the tabletop cutting machine 1.

The cutting machine body 10 includes a body case 11. The rear part of the main body case 11 is supported by the main body support slider 8 of the upper slide mechanism 7 via the main body tilting shaft 9. The main body case 11 covers the range of the upper half of the circular rotary blade 12 on the upper half. The rotary blade 12 rotates in the clockwise direction in FIG. 1 as indicated by the white arrow displayed on the main body case 11. The rotary blade 12 is attached to the spindle 13. The spindle 13 is rotatably supported by the main body case 11 and rotates via an electric motor 70 and a reduction gear train attached to the back side of the main body case 11 (right side as viewed from the user H, not visible in FIG. 1). The rotation axis of the spindle 13 becomes the rotation axis of the rotary blade 12.
Further, a handle portion 14 that is gripped by the user is provided on the back side of the main body case 11. When the user holds the handle portion 14 and pulls the trigger switch lever 15 with the fingertip, the electric motor 70 is activated and the rotary blade 12 rotates. Further, the rotating blade 12 that rotates by the user holding the handle portion 14 and tilting the cutting machine body 10 downward can be cut into the cutting material W.
The lower half of the rotary blade 12 is covered by the movable cover 16. The movable cover 16 is supported by the main body case 11 through a support shaft 16 a parallel to the spindle 13 so as to be rotatable up and down. The movable cover 16 is opened and closed in conjunction with the vertical movement of the cutting machine main body 10 by the link plate 100 interposed between the front end portions of the main body support slider 8. Details of the link plate 100 will be described later.

As shown in FIG. 3, the electric motor 70 is attached to a motor attachment base 11 a provided on the right side surface of the main body case 11. The electric motor 70 is attached obliquely downward with the rear side in the motor axis J direction being the upper side.
A controller 72 is disposed on a side portion of the electric motor 70 along the motor axis J. The controller 72 mainly includes a control board that mainly controls the rotational speed of the electric motor 70, and is programmed with various functions such as a known slow start function. The present embodiment is characterized by the mounting position of the controller 72, and the function itself of the controller 72 may be a conventionally known one, and no particular change is required in the present embodiment.
As shown in FIGS. 4 and 5, a controller case 73 for housing the controller 72 is integrally provided in the motor housing 71 of the electric motor 70. The controller case portion 73 is formed integrally with the rear side portion of the motor housing 71. The motor housing 71 and the controller case portion 73 are opened to the main body case 11 side (the front side in FIGS. 4 and 5). The opening of the controller case 73 and the opening of the motor housing 71 are arranged almost flush with each other in the front-to-back state. The controller 72 can be housed in the controller case 73 through the opening of the controller case 73, and can be taken out from the controller case 73.
FIG. 7 shows the electric motor 70 alone. Inside the motor housing 71 having a substantially cylindrical shape, a rotor 74 is rotatably accommodated via bearings 75 and 76. A rear bearing 76 is attached to the bottom (right end) 77 of the motor housing 71. In addition, carbon brushes 74 b and 74 b that are in sliding contact with the commutator 74 a of the rotor 74 are held on the bottom 77 of the motor housing 71. Although omitted in FIG. 7, the bottom 77 is provided with a plurality of intake holes 77 a to 77 a (see FIGS. 3, 8, and 9) for taking cooling air into the motor housing 71.

The left bearing 75 is supported on the motor mounting base 11 a side of the main body case 11. A cooling fan 78 is attached to the rotor shaft 74 c (output shaft of the electric motor 70) of the rotor 74. The cooling fan 78 rotates integrally with the rotation of the rotor 74. When the cooling fan 78 rotates, outside air is introduced into the motor housing 71 through the intake holes 77 a to 77 a of the bottom 77. The introduced outside air flows from the right side to the left side of the motor housing 71 (from the front end portion toward the output portion). As the outside air (cooling air) flows through the motor housing 71, the rotor 74 and its surroundings are cooled. A baffle plate 79 is disposed on the windward side of the cooling fan 78. The baffle plate 79 is disposed mainly for the purpose of increasing the cooling efficiency by narrowing the ventilation area on the windward side of the cooling fan 78. FIG. 6 shows the baffle plate 79 alone. The baffle plate 79 has a substantially cylindrical shape, and includes a side portion 79a that covers the periphery of the cooling fan 78, and a throttle portion 79b that projects from the windward side of the side portion 79a to the inner peripheral side. A ventilation hole 79c is provided in the center of the throttle portion 79b. The flow of the air after cooling the rotor 74 is throttled by the ventilation holes 79c, so that a smooth air flow in the motor housing 71 is generated, and as a result, efficient cooling air is introduced.
On the leeward side (the left side in FIG. 6) of the baffle plate 79, a lid 73a of the controller case portion 73 is integrally provided. For this reason, when the baffle plate 79 is attached to the motor housing 71 in the assembly process of the electric motor 70 or its maintenance work, the opening of the controller case 73 is simultaneously closed by the lid 73a. The lid 73a is screwed to the controller case portion 73 with screws 73b.
Thus, the controller 72 for mainly controlling the rotational speed of the electric motor 70 is disposed on the side portion of the electric motor 70 and on the rear side portion as viewed from the user H. Therefore, the electric motor 70 is more compact in the direction of the motor axis J than the conventional arrangement of the electric motor. In addition, in the case of the present embodiment, the controller 72 and its controller case portion 73 are arranged on the rear surface side opposite to the user H, so that the visibility of the cut site at the time of sumi line alignment is good and it looks good. It is getting better.

Next, as shown in FIGS. 8 and 9, a lighting device 80 is attached to the right side of the handle portion 14 mainly for the convenience of cutting work in a dark place. The illuminating device 80 includes an illumination main body 81 having LEDs (light emitting diodes) and flexibility for moving and holding the illumination main body 81 to an arbitrary position, and is used for wiring through. A support arm 82 having a peripheral hole, a switch box 83, and a cover plate 84 are provided. The illumination main body 81 is supported on the upper end of the support arm 82. A switch box 83 is attached to the lower end of the support arm 82. The cover plate 84 has a function as a lid that closes the vertically long wiring recess 14 a provided on the side portion of the handle portion 14. The wiring of the illumination body 81 is connected to the switch box 83 side through the inner peripheral hole of the support arm 82, and the wiring of the switch box 83 is connected to the power supply side in the wiring recess 14a. FIG. 9 shows a connected connector 86.
As shown in FIG. 8, the switch box 83 is provided with two push-button switches, an illumination switch 83a for turning on / off the illumination device 80 and a laser switch 83b for turning on / off the laser oscillator for the sumi line alignment. It has been. The assembled switch box 83 is fixed with two screws 87 and 88 fitted in the upper part of the wiring recess 14a. By attaching the switch box 83 to the side of the handle portion 14 in this way, the support arm 82 is supported so as to protrude upward, and therefore the illumination main body 81 is located above the main body case 11 as shown in FIGS. And is held in a state of projecting to the left side of the cutting blade 12.
As shown in FIG. 9, an engagement stepped portion 83 c is provided on the lower surface of the switch box 83. The upper end portion of the cover plate 84 is inserted below the engagement stepped portion 83c. By inserting the upper end portion below the engagement stepped portion 83c, the upper portion of the cover plate 84 is fixed in a state of closing the wiring recess 14a. As shown in FIG. 8, the lower side of the cover plate 84 is screwed to the handle portion 14 with screws 85. Thus, the cover plate 84 can be attached in a state of closing the wiring recess 14a by inserting the upper end of the cover plate 84 into the lower side of the engagement stepped portion 83c of the switch box 83 to which the cover plate 84 is attached in advance and screwing the lower portion with screws.
In this way, the illumination main body 81 is supported by the assembled switch box 83 via the support arm 82, and the wiring connector 86 on the switch box 83 side is connected to the power supply side in the wiring recess 14a. . For this reason, if the cover 84 is removed, the connector 86 can be easily disconnected from the power source side, and the illumination device 80 can be easily detached from the handle portion 14 by removing the switch box 83. Since the illumination device 80 can be easily attached to and detached from the handle portion 14, the maintainability can be improved.
As shown in FIGS. 10 and 12, a laser transmitter 90 for aligning the smear lines is attached to the front portion of the main body case 11. As described above, when the laser switch 83b is turned on, laser light is emitted from the laser transmitter 90. In the state where the cutting machine main body 10 is moved downward, the irradiated laser light is irradiated toward a smear line drawn on the upper surface of the cutting material W, which is a cutting site where the rotary blade 12 is cut into the cutting material W. The The cutting material W can be accurately positioned with respect to the rotary blade 12 by aligning the smear line with the laser beam irradiated on the upper surface of the cutting material W.
In front of the laser transmitter 90 and on the peripheral surface of the movable cover 16, a window portion 16 b for allowing laser light to pass is opened. This window portion 16b is a partial range along the peripheral surface of the movable cover 16, and is in a certain range before and after the cutting machine body 10 is below the laser transmitter 90 when the cutting machine body 10 is at the top dead center position. It is elongated along. Since the laser beam irradiated from the laser transmitter 90 is irradiated to the cutting material W without being attenuated by the window portion 16b, it is possible to efficiently perform the smear line matching.

As described above, the movable cover 16 covering the lower half of the rotary blade 12 is opened and closed in conjunction with the vertical movement of the cutting machine body 10. The movable cover 16 is supported by the main body case 11 through a support shaft 16 a parallel to the spindle 13 so as to be rotatable up and down. A link plate 100 is interposed between the movable cover 16 and the tip of the slider 8.
As shown in FIGS. 1, 10, and 12, the rear end portion of the link plate 100 is coupled to the front end portion of the main body support slider 8 via a support shaft 101 so as to be vertically rotatable. The support shafts 101 are arranged parallel to each other with a certain amount of deviation from the main body tilting shaft 9. As the cutting machine body 10 tilts, the link plate 100 tilts up and down around the support shaft 101 with respect to the slider 8. As the cutting machine main body 10 moves up and down, the link plate 100 tilts up and down around the support shaft 101, so that the movable cover 16 rotates up and down with respect to the main body case 11, and thus opens and closes up and down. The When the cutting machine body 10 is tilted downward, the movable cover 16 is rotated and opened in the counterclockwise direction in FIG. 1, whereby the lower half circumference of the rotary blade 12 is gradually opened. When the cutting machine main body 10 is tilted upward, the movable cover 16 is rotated clockwise in FIG. 1 and gradually closed.
The link plate 100 extends from the front of the main body support slider 8 to the front through the inside of the main body case 11. The front end portion 100 a side of the link plate 100 reaches the vicinity of the support shaft 16 a of the movable cover 16. In the vicinity of the support shaft 16a of the movable cover 16, an engaging wall portion 102 is integrally provided. A ball bearing (not shown) is attached to the front end portion 100 a of the link plate 100, and this ball bearing is abutted against the engaging wall portion 102. The movable cover 16 is biased in the closing direction by a tension spring (not shown). Therefore, the engagement wall portion 102 is pressed against the ball bearing at the front end portion 100 a of the link plate 100 by the biasing force of the tension spring.
Further, a guide groove 100b that is gently curved is provided in the middle of the link plate 100 in the longitudinal direction. A guide pin 103 provided on the rear side of the left side wall 11b of the main body case 11 is inserted into the guide groove 100b. Since the guide groove 100b functions as a cam groove, when the cutting machine main body 10 is moved downward, the link plate 100 is tilted in the direction of pushing the engaging wall portion 102 forward by the front end portion 100a, thereby moving the movable cover. 16 is gradually opened against the tension spring. As shown in FIG. 12, when the cutting machine body 10 is moved down to the lower end, the movable cover 16 is fully opened. Conversely, when the cutting machine body 10 is returned upward as shown in FIG. 10, the link plate 100 is tilted in a direction to separate the front end portion 100a from the engagement wall portion 102, whereby the movable cover 16 is pulled by the tension spring. It will be closed. FIG. 10 shows the fully closed state of the movable cover 16.

The guide groove 100b of the link plate 100 has a dustproof measure. As shown in FIGS. 10 and 12, a cylindrical dust collection port 105 for collecting cutting powder generated in the main body case 11 is provided at the rear part of the main body case 11. Further, a dust collecting wall portion 106 having a U-shaped cross section for efficiently guiding the cutting powder wound up by the rotary blade 12 into the dust collecting port 105 is attached to the rear portion of the main body case 11. Thus, a large amount of cutting powder is scattered in the vicinity of the dust collection port 105 and the dust collection wall 106 at the rear of the main body case 11. For this reason, it is important to take appropriate dust-proof measures for the link plate 100 disposed in the rear part of the main body case 11 and the guide pins 103 inserted in the guide grooves 100b in order to ensure smooth operation. . In this embodiment, as shown in FIG. 14, the shielding plate 110 is attached to the side of the guide groove 100b. The shielding plate 110 is fixed to the tip of the guide pin 103 with a retaining ring. The shielding plate 110 is located between the rotary blade 12 and the link plate 100. For this reason, it is prevented that the cutting powder wound up by the rotation of the rotary blade 12 toward the dust collection port 105 is shielded by the shielding plate 110 and falls on the periphery of the link plate 100 and the guide groove 100b. It has been made.
Since the cutting powder is prevented from being sprayed on the guide groove 100b and the guide pin 103, for example, the cutting powder accumulates in the guide groove 100b and the relative movement of the guide pin 103 is hindered. It is possible to prevent a problem that the tilting operation is not performed smoothly and the movable cover 16 is not smoothly opened and closed in conjunction with the vertical movement of the cutting machine body 10.
In addition, as shown in FIG. 15, a stepped portion 107 is provided along the side of the dust collection port 105 as a cross-sectional shape of the rear portion of the main body case 11. As shown in FIGS. 10 and 12, the shielding plate 110 is attached so as to protrude downward from the stepped portion 107. Further, the shielding plate 110 is attached with its upper edge approached to a position where there is almost no gap between the stepped portion 107. By being partitioned by the step portion 107 and the shielding plate 110 in this way, the wound cutting powder is reliably prevented from flowing into the link plate 100 from the dust collection port 105, and the dust-proofing effect of the shielding plate 110. Is further enhanced.
As shown in FIG. 10, a dust collection bag 120 is attached to the rear part of the dust collection port 105. Cutting powder wound up at the cutting site by the rotation of the rotary blade 12 is collected in the dust bag 120 through the dust collection port 105. The dust bag 120 is maintained in a state of being appropriately inflated by a resin bag bracket 121. The bag bracket 121 includes an attachment portion 121 a having an annular shape as an attachment portion for the dust collection port 105 at the front portion thereof. An auxiliary bracket 122 is attached to the rear side of the bag bracket 121. The auxiliary bracket 122 is supported so as to project obliquely downward from the rear side of the bag bracket 121. Even if the bag bracket 121 is shortened by the auxiliary bracket 122, the dust bag 120 can be held in an appropriately inflated state. Therefore, the dust bag 120 can be made compact in accordance with the miniaturization of the cutting machine body 10. It becomes easy. Note that the dust bag 120 and the bag bracket 121 are shown only in FIG. 10 and are omitted in the other drawings.

According to the tabletop cutting machine 1 of the present embodiment described above, a high dustproof effect can be obtained particularly with respect to the guide groove 100b and the guide pin 103 of the link plate 100 for opening and closing the movable cover 16, and thereby the movable cover 16 can be obtained. The smooth opening / closing operation can be maintained over a long period of time.
Moreover, since the link play 100 is disposed along the side wall 11b of the main body case 11, and the side wall 11b functions as a shielding plate, adhesion of cutting powder to the link plate can be prevented. Smooth operation can be ensured more reliably.
Further, a stepped portion 107 is provided inside the main body case 11 along the side of the dust collection port 105, and the link plate 100 is disposed below the stepped portion 107. For this reason, the upper part of the link plate 100 is shielded from the rotary blade 12 side by the step portion 107, so that the dust prevention of the link plate 100 is further ensured. Further, since the link plate 100 is shielded from the rotary blade 12 side using the side wall 11b and the stepped portion 107 of the main body case 11, the link plate 100 can be protected from dust only by adding the shielding plate 110. Thus, a high dustproof effect of the link plate 100 can be obtained with a simple and low-cost configuration.

Various modifications can be made to the embodiment described above. For example, although the configuration in which the upper portion of the link plate 100 is shielded by the step portion 107 of the main body case 11 is provided, instead of the step portion 107, an upper surface shielding portion that is bent in an L shape is provided on the upper portion of the shielding plate 110, The upper surface shielding portion may be configured to shield the upper side of the link plate 100. Further, a portion that shields the upper side of the link plate 100 (the stepped portion 107 and the upper surface shielding portion) may be omitted, and only the both sides of the link plate 100 may be shielded by the side wall 11b and the shielding plate 110.
Also, the guide plate 100b is provided in the link plate 100, the guide pin 103 is inserted into the guide groove 100b, and the guide groove 100b functions as a cam portion. However, conversely, the guide pin is provided in the link plate. The cam portion may be configured by inserting this into a guide groove provided on the main body case side.
Further, instead of the groove-shaped guide groove 100b, a cam convex portion having a cam surface is provided on the side of the link plate, and the guide pin (follower) on the main body case 11 side is relatively displaced along the cam surface. Accordingly, the movable cover may be opened and closed by displacing the link plate along the path. Even in such a case, the periphery of the cam projection and the guide pin is shielded by a shielding plate to prevent the attachment and accumulation of cutting powder, thereby maintaining a smooth opening and closing operation of the movable cover for a long period of time. Can do.
Moreover, although the structure which functions the side wall 11b of the main body case 11 as a shielding board was illustrated, it is good also as a structure which each arrange | positions a dedicated shielding board to the both sides of a link plate.

H ... User W ... Cutting material 1 ... Tabletop cutting machine 2 ... Table 3 ... Base 3a ... Auxiliary table part 4 ... Body support part 5 ... Positioning fence 6 ... Slide mechanism (lower stage side) 6a ... Slide bar 7 ... Slide Mechanism (upper side), 7a ... slide bar, 7b ... holder 8 ... main body support slider 9 ... main body tilting shaft, 9a ... torsion spring 10 ... cutting machine main body 11 ... main body case, 11a ... motor mounting base, 11b ... side wall 12 ... Rotary blade 13 ... Spindle 14 ... Handle part, 14a ... Wiring recess 15 ... Switch lever 16 ... Moving cover, 16a ... Support shaft, 16b ... Window part 20 ... Tilt support mechanism 21 ... Main body support arm 70 ... Electric motor J ... Motor Axis 71 ... Motor housing 72 ... Controller 73 ... Controller case, 73a ... Lid, 73b ... Screw 74 ... Rotor 74a ... Commutator, 4b ... carbon brush, 74c ... rotor shaft (output shaft)
75, 76 ... Bearing 77 ... Bottom of motor housing 71, 77a ... Intake hole 78 ... Cooling fan 79 ... Baffle plate, 79a ... Side part, 79b ... Restriction part, 79c ... Ventilation hole 80 ... Illumination device 81 ... Illumination body part 82 ... support arm 83 ... switch box 83a ... lighting switch, 83b ... laser switch, 83c ... engagement stepped portion 84 ... cover plate 85 ... screw 86 ... connector 87, 88 ... screw 90 ... laser transmitter 100 ... link plate, 100a ... Front end portion, 100b ... Guide groove 101 ... Support shaft 102 ... Engagement wall portion 103 ... Guide pin 105 ... Dust collection port 106 ... Dust collection wall portion 107 ... Stepped portion 110 ... Shield plate 120 ... Dust collection bag 121 ... Bag bracket 121a ... Mounting portion 122 ... Auxiliary bracket

Claims (4)

A tabletop cutting machine comprising a table for placing a cutting material and a cutting machine main body supported above the table, wherein the cutting machine main body includes a movable cover that covers a rotary blade, and the movable cover is cut into the cutting cover. A link plate for opening and closing in conjunction with the vertical movement of the machine main body is provided, and a shielding plate is arranged on both sides of the link plate in the main body case of the cutting machine main body, and is generated in the main body case. A tabletop cutting machine configured to shield the link plate from cutting powder. 2. The tabletop cutting machine according to claim 1, wherein the link plate is disposed along an inner surface of a side wall of the main body case, and the side wall functions as the one shielding plate. It is a tabletop cutting machine of Claim 2, Comprising: In addition to the both sides of the said link plate, the tabletop cutting machine comprised as the structure shielded from the said cutting powder also about upper direction. 4. The tabletop cutting machine according to claim 3, wherein the upper part of the link plate is shielded by using a step portion provided on an upper portion of the side wall of the main body case.

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