JP5115415B2 - Portable cutting machine - Google Patents

Description

  The present invention relates to a portable cutting machine that cuts a workpiece with a saw blade that is rotationally driven by a motor.

  For example, a portable cutting machine such as a tip saw cutter is detachably attached to a motor, a disc-shaped saw blade that is rotationally driven by the motor, a saw cover that covers a part of the outer periphery of the saw blade, and the saw cover. It has a dust collecting cover.

  Here, FIG. 10 shows a structure of a portable cutting machine 100 provided with a conventional dust collecting cover 101. The dust cover 101 has a central portion attached to the saw cover 103 with a bolt 102, and the saw cover 103 is fixed to the cutting machine 100 with a bolt 102. The dust collecting cover 101 is removed from the saw cover 103 by releasing the fixation with respect to the saw cover 103 by turning the bolt 102.

  The dust collection cover 101 is for collecting dust (chip) generated by the cutting operation of the workpiece. The dust is collected and accumulated in the dust collection space 105 formed by the saw cover 103 and the dust collection cover 101 by the rotation of the saw blade 104. When the dust collection space 105 is filled with dust, the dust collection capability is reduced. Therefore, the operator loosens the bolt 102, removes the dust collection cover 101 from the saw cover 103, and discards and cleans the dust.

  Further, Patent Document 1 discloses a technique in which the dust collection cover can be moved up and down according to the inclination so that the dust collection cover does not interfere with the inclination when the circular saw body is inclined to perform the cutting operation. ing.

Japanese Patent No. 3899224

  However, in the conventional cutting machine and the technique disclosed in Patent Document 1, it is possible to reduce dust disposal work by increasing the dust collection space formed by the saw cover and the dust collection cover and increasing the amount of dust collection. However, on the other hand, there is a problem that the cutting machine itself becomes large and it becomes difficult to work in a narrow place.

  The present invention has been made in view of the above problems, and an object thereof is to provide a portable cutting machine capable of changing the size of the dust holding space and improving the working efficiency. .

  In order to achieve the above object, the present invention provides a motor having a rotating shaft, a saw blade that is attached to the rotating shaft of the motor and rotates, a saw cover that covers a part of the outer periphery of the saw blade, and a detachable attachment to the saw cover. In a portable cutting machine having a main body equipped with a dust collecting cover that can be attached and accommodates dust, the saw cover and the dust collecting cover are configured by changing the attachment state of the dust collecting cover to the saw cover. The size of the storage space for storing the dust can be changed.

  With this configuration, the size of the storage space for storing the dust generated by the cutting work can be varied, so the capacity of the storage space can be changed according to the situation such as the cutting work or the cutting place. Efficiency can be improved.

  Preferably, an interposition member is provided between the saw cover and the dust collection cover, and the capacity of the storage space can be changed by changing the mounting direction of the interposition member with respect to the main body. Further, it is preferable that the interposition member has a different distance from a surface contacting the saw cover to a surface contacting the dust collecting cover by changing an attachment direction with respect to the main body.

  With such a configuration, the capacity of the storage space can be easily changed simply by changing the direction of the interposition member, and work efficiency and operability can be improved.

  Moreover, it is preferable to have a slide part which has arrange | positioned the said dust collection cover so that a slide in the axial direction of the said rotating shaft with respect to the said main body.

  With such a configuration, it is possible to easily change the capacity of the storage space only by sliding the dust collecting cover, and it is possible to improve work efficiency and operability.

  The slide portion includes an operation lever provided on one side of the main body or the dust collecting cover, an engagement groove provided on the other side and engaged with one end portion of the operation lever, and one end portion of the operation lever. It is preferable to provide an elastic body that biases the other end of the operation lever so as to engage with the engagement groove.

  With such a configuration, the storage space can be securely fixed after the dust collection cover is slid to set the storage space.

  Moreover, it is preferable that the said engaging groove is provided in multiple places in the axial direction of the said rotating shaft of the said main body or the said dust collection cover.

  With such a configuration, the dust collection cover can be slid and fixed at an arbitrary position, so that the optimal storage space capacity can be set according to the cutting operation.

  Moreover, it is preferable to provide a sealing member between the dust collection cover and the main body. By adopting such a configuration, it is possible to prevent the leakage of dust from the storage space.

  According to the present invention, since the size of the dust storage space can be changed, an appropriate storage space can be set according to the cutting work and the work place, and the work efficiency can be improved. Further, since the dust collection cover can be slidably attached to the main body, the capacity of the storage space can be easily set, and the operability can be improved.

Embodiments of the present invention will be described below with reference to FIGS.
<Embodiment 1>
FIG. 1 is a side view of a portable cutting machine according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 showing a state where the dust collection space is reduced, and FIG. 1 is a cross-sectional view taken along the line BB in FIG. 1, FIG. 4 is an enlarged view of a portion C in FIG. 3, FIG. 5 is a cross-sectional view taken along the line AA in FIG. FIG. 7 is a cross-sectional view taken along the line BB of FIG. 1 showing a state where the dust space is enlarged, and FIG.

  1 and 2, a portable cutting machine 1 (hereinafter referred to as a cutting machine) is an electric type using a motor 2 as a drive source, and a motor housing 1b connected to a cutting machine main body 1a includes The motor 2 is horizontally arranged in the horizontal position (left and right direction in FIG. 2). A disc-shaped saw blade 3 is attached to the output shaft 2a of the motor 2, and the saw blade 3 is covered with a saw cover 4 at the outer periphery of the upper half portion, and a part of the lower half portion is an output shaft. It can be rotated around 2a and is covered with a protective cover 5 housed in the saw cover 4 when rotated.

  In addition, the cutting machine body 1a is provided with a handle 6 for an operator to hold. The handle 6 is activated by turning on or off the power supply from the power cord 7 to the motor 2. Alternatively, a switch 8 for stopping is provided.

  Further, the cutting machine main body 1 a is provided with a rectangular plate-like base 10 placed on the workpiece 9, and the saw blade 3 penetrates the slit-like insertion groove 10 </ b> A formed in the base 10. A part of the saw blade 3 protrudes below the base 10 as shown in FIG. 1 so that the workpiece 9 can be cut by the saw blade 3.

  By the way, the dust cover 10 for collecting dust (chip) generated by the cutting operation of the workpiece 9 is detachably attached to the saw cover 4 by bolts 14 with respect to the cutting machine 1 (saw cover 4). ing. Here, in the present embodiment, the saw cover 4 is sandwiched between a dust collecting sleeve 12 and a cutting machine main body 1a constituting a variable capacity mechanism described later, and the dust collecting cover 11 is detachably attached to the saw cover 4. Yes.

  In order to cut the workpiece 9 using the cutting machine 1 configured as described above, the bottom surface of the base 10 is placed on the workpiece 9, the switch 8 is turned on, and power is supplied from the power cord 7 to the motor 2. To start the motor 2. The saw blade 3 attached to the rotating shaft 2a of the motor 2 is rotationally driven in the direction of arrow A in FIG. 1 (counterclockwise in FIG. 1) by the rotating shaft 2a, and the operator holds the handle 6 and cuts the cutting machine 1 Is moved along the surface of the workpiece 9, the workpiece 9 is cut by the rotating saw blade 3. As shown by the arrow B in FIG. 2, the dust generated by cutting the workpiece 9 is wound up by the air flow generated along with the rotation of the saw blade 3 and enters the saw cover 4, and the saw cover together with the air flow. 4 is collected and accumulated in a dust collection space 15 which is a storage space formed by a saw cover 4 and a dust collection cover 5 which will be described later. In addition, you may perform the electric power supply to the motor 2 with the battery which can be charged / discharged repeatedly.

  When dust accumulates in the dust collecting space 15 formed by the saw cover 4 and the dust collecting cover 11, the dust collecting cover 11 is detached from the saw cover 4 by holding the gripping portion 14a and loosening the bolts 14, and the dust is discarded. Can be cleaned. In the cutting machine 100 having the conventional dust collecting cover shown in FIG. 10, the dust collecting cover 101 is fixed to the cutting machine main body 100A only by the two bolts 106 provided before and after the cutting direction, and the dust collecting space 105 is fixed. It was the size of. Accordingly, when the dust collection cover 101 (dust collection space) is large, the amount of collected dust can be increased, but the cutting machine 1 itself becomes large and the dust collection cover 101 becomes an obstacle in some work places, so that the cutting work is interrupted. However, if it is small, the amount of collected dust becomes small, and it becomes necessary to frequently dispose of dust, resulting in a reduction in work efficiency.

  Therefore, in the present embodiment, the size of the dust collection space (the amount of collected dust) formed between the saw cover 4 and the dust collection cover 11 can be changed, and the dust collection is performed in accordance with the cutting operation. The space can be adjusted and workability can be improved. Hereinafter, the adjustment mechanism of the dust collection space according to the present embodiment will be described in detail.

  As shown in FIGS. 2 to 7, a dust collection sleeve 12 that constitutes a variable capacity mechanism and serves as an interposition member is disposed between the saw cover 4 and the dust collection cover 11, and the dust collection sleeve 12 is connected to the dust collection cover 11. The size of the dust collection space 15 can be adjusted by making the abutting portions 12a and 12b asymmetrical and changing the mounting direction with respect to the cutting machine main body 1a.

  As shown in FIG. 3, the dust collecting sleeve 12 has a screw portion 12 d for fixing a butterfly bolt 13 having a gripping portion 13 a that penetrates the cutting machine main body 1 a and the saw cover 4. An abutting surface 12c that abuts the saw cover 4 is formed on the outer periphery of the dust collecting sleeve 12 according to the mounting direction of the dust collecting sleeve 12, and the distance from the abutting surface 12c is different, one being the main body 1a and the other being the collecting surface. Abutting surface portions 12a and 12b that contact the dust cover 11 are formed on both the front and back surfaces. Further, on the outer periphery of the dust collecting sleeve 12, a groove portion 12 e for engaging with the tip end portion 11 a of the dust collecting cover 11 is formed.

  On the other hand, a recess 1c is formed on the outer periphery of the cutting machine main body 1a so that the abutting surface portion 12a does not come into contact when the dust collecting sleeve 12 is fixed with the bolt 13, that is, the abutting surface portion 12a is avoided. It is formed as follows.

  When fixing the dust collecting sleeve 12 formed as described above to the cutting machine main body 1a, the distance between the saw cover 4 and the dust collecting cover 11 depends on which of the abutting surface portions 12a and 12b abuts against the dust collecting cover 11. Changes, and the size of the dust collection space 15 can be selected.

  2 to 4 are cross-sectional views when the abutting surface portion 12b of the dust collecting sleeve 12 is abutted against the dust collecting cover 111, and the dust collecting space 15 is small. FIGS. It is sectional drawing at the time of butting | butting the abutting surface part 12a of the sleeve 12 against the dust collection cover 11, and shows the state where the dust collection space 15 is large.

  First, a case where the dust collection space 15 shown in FIGS. 2 to 4 is small, that is, a case where dust is not generated so much by cutting work or a work place is narrow will be described. In this case, the dust collecting sleeve 12 is attached to the main body 1a as shown in FIG. The dust collecting sleeve 12 is substantially L-shaped, and when the dust collecting sleeve 12 is attached to the main body 1a with the bolt 13 having the gripping portion 13a, the hole 12d into which the bolt 13 is inserted is a part of the dust collecting sleeve 12. It is formed through the part. The abutting surface portion 12 a is disposed on the main body 1 a side, the abutting surface portion 12 b is disposed on the dust collecting cover 11 side, and the dust collecting sleeve 12 is fixed to the main body 1 a by bolts 13. In this case, the abutting surface 12 c on the abutting surface portion 12 a side comes into contact with the saw cover 4. The abutting surface portion 12a is arranged and fixed so as to enter the concave portion 1c provided in the main body portion 1a. On the other hand, the dust collecting cover 11 is brought into contact with the abutting surface portion 12b, and the tip end portion 11a of the dust collecting cover 11 enters the groove portion 12e provided in the dust collecting sleeve 12. Thereby, the horizontal displacement can be prevented, and the dust collection cover 11 can be easily positioned with respect to the dust collection sleeve 12. The end surface of the abutting surface portion 12b is disposed at substantially the same position as the end surface of the abutting surface 12c on the side that does not contact the saw cover 4.

  After the dust collecting sleeve 12 is fixed to the main body 1a and the dust collecting cover 11 is positioned, the dust collecting cover 11 is fixed to the cutting machine 1 by bolts 14, thereby forming the cutting machine 1 having a small dust collecting space 15. Can do.

  Next, a case where the dust collection space 15 shown in FIGS. 5 to 7 is large, that is, a case where a large amount of dust is generated in the cutting operation will be described. In this case, the dust collecting sleeve 12 is attached to the main body 1a as shown in FIG. The abutting surface portion 12b is disposed on the main body 1a side, the abutting surface portion 12a is disposed on the dust collecting cover 11 side, and the dust collecting sleeve 12 is fixed to the main body 1a with bolts 13. In this case, the abutting surface 12 c on the abutting surface portion 12 b side contacts the saw cover 4. The dust collecting cover 11 is brought into contact with the abutting surface portion 12a, and the front end portion 11a of the dust collecting cover 11 is brought into contact with the side surface of the abutting surface portion 12a. The dust collection cover 11 can be easily positioned with respect to the dust collection sleeve 12. The end surface of the abutting surface portion 12a is closer to the dust collecting cover 11 side than the abutting surface 12c by the distance X between the abutting surface 12c and the abutting surface portion 12a than the end surface of the abutting surface 12c on the side not in contact with the saw cover 4. Protrusively arranged. Therefore, since the dust collection space corresponding to the distance X can be increased with respect to the states of FIGS. 2 to 4, the dust collection space 15 can be enlarged, and the dust collection efficiency can be improved.

  The dust collecting sleeve 12 is fixed to the main body 1a, the dust collecting cover 11 is positioned, and then the dust collecting cover 11 is fixed to the cutting machine 1 with bolts 14, thereby forming the cutting machine 1 having a large dust collecting space 15. Can do.

  From the above, in the present embodiment, since the dust collecting sleeve 12 can be fixed to the cutting machine body 1a on either the front or back side, either one of the abutting surface portions 12a and 12b contacting the dust collecting cover 11 is selected. Can be fixed. By selecting the abutting surface portion, the distance from the cutting machine main body 1a to the dust collecting cover 11 can be changed, and the size of the dust collecting space 15 for accumulating dust can be easily changed.

Therefore, according to the present embodiment, the dust collection space 15 in which the dust is accumulated can be easily changed by attaching the dust collection sleeve 12 to the front and back, so that the work efficiency can be improved.
<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 8 is a cross-sectional view showing a fixed state of the dust collecting cover 11 of the portable cutting machine 1 according to the embodiment of the present invention, and FIG. 9 is a diagram when the attachment position of the dust collecting cover 11 is changed with respect to the main body 1a. FIG. 8 is an enlarged view of a portion D. In these drawings, the same reference numerals are given to the components having the same functions as those shown in FIGS. 1 to 7, and description thereof will be omitted below.

  The basic configuration of the cutting machine 1 according to the present embodiment is the same as that of the first embodiment, except that the adjustment mechanism of the dust collection space 15 of the dust collection cover 11 is changed. The dust collecting sleeve 12 of the form is deleted, and the dust collecting space 15 is adjusted by the operation lever 16 instead.

  The saw cover 4 is fixed to the cutting machine main body 1 a, and the dust collecting sleeve 12 and the bolt 14 are not used. Instead, the capacity variable mechanism is configured by a slide part, and the dust collecting cover 11 is directly operated by the operation lever 16. It was set as the structure fixed to 1a. Specifically, the cutting machine main body 1a is provided with an operation lever 16 having an engagement portion 16a with the dust collecting cover 11 so as to be rotatable via a shaft 17. The operation lever 16 is provided with the cutting machine main body 1a. The engaging portion 16a is arranged to be urged to the dust collecting cover 11 by an elastic body 18 composed of a spring or the like that is contracted to 1a. The slide portion includes an operation lever 16, a shaft 17, an elastic body 18, and a concave portion 11b described later.

  On the other hand, the dust collecting cover 11 is formed with a plurality of recesses 11b that engage with the engaging portion 16a of the operation lever 16 and fix the dust collecting cover 11 and the cutting machine body 1a. An outer peripheral wall 11c extending toward the cutting machine main body 1a and the saw cover 4 is formed on the entire circumference of the dust collecting cover 11, and is configured to wrap around the one cutting machine main body 1a and the saw cover 4. Further, a seal member 19 is provided for preventing dust from leaking from a gap generated between the dust collecting cover 11 and the cutting machine main body 1a and the saw cover 4.

  In the present embodiment, as shown in FIG. 8, when the dust cover 11 is attached to the cutting machine main body 1a, the engaging portion 16a of the operating lever 16 is engaged with the recess 11b of the cutting machine main body 1a. Since the elastic body 18 is biased, the dust collecting cover 11 is securely fixed to the cutting machine main body 1a, and the dust collecting cover 11 does not come off the cutting machine main body 1a.

  In order to remove the dust collection cover 11 from the state in which the dust collection cover 11 is fixed to the cutting machine main body 1a, the operator operates the operation portion 16b of the operation lever 16 to move the operation lever 16 around the shaft 17 as an elastic body. Since the engagement between the engaging portion 16a and the concave portion 11b is released by pushing against 18, the positions of the dust collecting cover 11 and the cutting machine main body 1a can be changed. Similarly, the size of the dust collection space 15 for accumulating dust can be easily changed. The procedure for changing the capacity of the dust collection space 15 will be specifically described with reference to FIG.

  FIG. 9A shows a normal state. In this state, the dust collection space 15 is set to the smallest capacity. From this state, by pushing the operating portion 16b of the operating lever 16 against the urging force of the elastic body 18 in the direction of the arrow Y shown in FIG. The joining portion 16a is detached from the concave portion 11b of the dust collecting cover 11. Thereafter, as shown in FIG. 5C, the dust collection cover 11 is slid in the direction of arrow Z, and the engagement portion 16a is a recess corresponding to the cutting operation among the plurality of recesses 11b provided in the dust collection cover 11. Engage with 11b. That is, the pressure applied to the operation portion 16b is released, the operation lever 16 is rotated around the shaft 17 by the urging force of the elastic body 18, and the concave portion 11b and the engagement portion 16a are engaged with each other, thereby collecting the dust collecting cover 11. The capacity of the dust collection space 15 can be changed, an appropriate dust collection capacity can be ensured according to the cutting work, and workability can be improved. In the present embodiment, since the engaging portion 16a and the recessed portion 11b are engaged and disengaged by the operation lever 16, the capacity of the dust collection space 15 can be easily changed and the operability is improved. Can also be improved.

  In order to make the dust cover 11 and the cutting machine main body 1a fixed more firmly, a plurality of fixing portions shown in FIG. 9 are provided, or the dust cover 11 is bolted as in the first embodiment. 14 can be used together with the method of fixing to the saw cover 4.

  Therefore, also in the present embodiment, the position of the dust collection cover 11 can be changed with good operability, and the dust collection space for accumulating dust can be easily changed. In addition, the dust cover 11 can be released and the dust cover 11 can be removed from the cutting machine main body 1a with good operability, and dust can be discarded and the dust cover can be easily cleaned.

  In the first embodiment, the capacity of the dust collection space 15 is determined by fixing the dust collection cover 11 to the main body 1a with the bolt 14 via the dust collection sleeve 12 and changing the mounting direction of the dust collection sleeve 12. In the second embodiment, the dust collection cover 11 is provided with a plurality of recesses 11b, and the operation lever 16 provided on the main body 1a is operated to operate the engagement between the recesses 11b and the locking portions 16a. The capacity of the dust collection space 15 is changed by performing engagement and disengagement. With such a configuration, the capacity of the dust collection space can be easily changed according to the cutting work, and workability and operability can be improved. Further, the present invention is characterized in that the capacity of the dust collection space can be changed regardless of the above embodiment, and various changes can be made.

It is a side view of the portable cutting machine which concerns on the 1st Embodiment of this invention. It is AA sectional drawing of FIG. 1 which shows the state which made the capacity | capacitance of dust collection space small. It is BB sectional drawing of FIG. 1 which shows the state which made the capacity | capacitance of dust collection space small. It is the C section expanded sectional view of FIG. It is AA sectional drawing of FIG. 1 which shows the state which enlarged the capacity | capacitance of the dust collection space which concerns on the 1st Embodiment of this invention. It is BB sectional drawing of FIG. 1 which shows the state which enlarged the capacity | capacitance of dust collection space. It is the C section expanded sectional view of FIG. It is sectional drawing of the portable cutting machine which concerns on the 2nd Embodiment of this invention. It is the D section expanded sectional view of FIG. It is an upper surface sectional view of the conventional portable cutting machine.

Explanation of symbols

  1 is a portable cutting machine, 1a is a cutting machine body, 2 is a motor, 3 is a saw blade, 4 is a saw cover, 5 is a protective cover, 6 is a handle, 7 is a power cord, 8 is a switch, 9 is a workpiece, 10 Is a base, 11 is a dust collecting cover, 12 is a dust collecting sleeve, 12a and 12b are abutting surface portions, 12c is a saw cover abutting surface, 13 is a butterfly bolt, 14 is a detachable bolt, 15 is a dust collecting space, and 16 is an operating lever. 16a is an engaging portion, and 16b is an operating portion.

Claims (7)

A motor having a rotating shaft;
A saw blade attached to the rotating shaft of the motor and rotating;
A saw cover covering a part of the outer periphery of the saw blade;
In a portable cutting machine having a main body provided with a dust collection cover that is detachably attached to the saw cover and stores dust,
A portable cutting device characterized in that a size of a storage space for storing the dust constituted by the saw cover and the dust collection cover can be changed by changing an attachment state of the dust collection cover to the saw cover. Machine.   The interposition member is provided between the saw cover and the dust collection cover, and the capacity of the storage space can be changed by changing the mounting direction of the interposition member with respect to the main body. Portable cutting machine.   The portable cutting machine according to claim 2, wherein the interposition member has a different distance from a surface that contacts the saw cover to a surface that contacts the dust collecting cover by changing an attachment direction with respect to the main body.   The portable cutting machine according to claim 1, further comprising a slide portion that is slidably disposed in the axial direction of the rotation shaft with respect to the main body.   The slide portion includes an operation lever provided on one of the main body or the dust collecting cover, an engagement groove provided on the other side and engaged with one end of the operation lever, and one end of the operation lever engaged with the slide. The portable cutting machine according to claim 4, further comprising an elastic body that biases the other end of the operation lever so as to engage with the groove.   The portable cutting machine according to claim 5, wherein the engagement groove is provided at a plurality of positions in an axial direction of the rotation shaft of the main body or the dust collecting cover.   The portable cutting machine according to any one of claims 4 to 6, wherein a seal member is provided between the dust collecting cover and the main body.

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