JP2018140572A - Cutting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting machine that allows a cutting blade to be replaced easily.SOLUTION: A cutting machine comprises: a housing 4 for rotatably bearing an output shaft 61 to which a circular saw blade P can be attached; a protection cover 8 supported pivotally on the housing 4 and movable between an initial position where the circular saw blade P is covered to the maximum and a pivotal position rotated by a predetermined angle from the initial position; a spindle lock 9 movable between a regulation position at which relative rotation of the output shaft 61 to the housing 4 is regulated and an allowable position at which relative rotation of the output shaft 61 to the housing 4 is allowed; and a holding portion capable of holding one of the protection cover 8 and the spindle lock 9 in the regulation position or the pivotal position when the other of the protection cover 8 and the spindle lock 9 is in the pivotal position or the regulation position.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a cutting machine.

  Conventionally, a tabletop cutting machine has been widely used as a cutting machine for cutting wood, pipes and the like (material to be cut). For example, Patent Document 1 includes a saw cover that rotatably supports a cutting blade and covers an upper portion of the cutting blade, and a protective cover that covers the outer periphery of the lower portion of the cutting blade and is provided so as to be rotatable with respect to the saw cover. A cutting machine is described. In the tabletop cutting machine, the rotation from the motor is transmitted to the output shaft, and the cutting blade mounted on the output shaft rotates.

  In the tabletop cutting machine described in Patent Document 1, when an operator removes the cutting blade (at the time of replacement), the rotation of the output shaft that rotatably supports the cutting blade is regulated in advance using a predetermined regulating member. Further, the protective cover is rotated with respect to the saw cover to expose a fixing member (such as a bolt) that fixes the cutting blade to the output shaft. Then, it is necessary to loosen the fixing member and remove the cutting blade while maintaining the state in which the rotation of the output shaft is restricted during the replacement operation and further maintaining the state where the fixing member is exposed during the replacement operation.

JP 2012-157929 A

  As described above, in the tabletop cutting machine described in Patent Document 1, when the operator replaces the cutting blade, the state in which the rotation of the output shaft is regulated by operating the regulating member is maintained. Two operations of maintaining the state in which the protective cover is rotated so as to be exposed must be continued during the replacement work, which is troublesome.

  In order to solve the above problems, an object of the present invention is to provide a cutting machine in which a cutting blade can be easily replaced.

  In order to solve the above-described problems, the present invention provides a housing that rotatably supports an output shaft on which a cutting blade can be mounted, an initial position that is rotatably supported by the housing and covers the cutting blade to the maximum. A protective cover movable between a rotation position rotated by a predetermined angle from the initial position, a restriction position for restricting relative rotation of the output shaft to the housing, and relative rotation of the output shaft to the housing A rotation restricting member that is movable between an allowable position and a position where the protection cover and the rotation restricting member are positioned at the rotation position or the restricting position. There is provided a cutting machine having a holding portion capable of holding either one of the rotation restricting member at the restricting position or the rotating position.

  According to this configuration, the rotation restricting member can be held at the restricting position by holding the protective cover at the rotating position when the cutting blade is replaced, and the protection can be achieved by holding the rotation restricting member at the restricting position. The cover can be held in the pivot position. Therefore, it is not necessary to simultaneously perform the operation for maintaining the rotational position and the operation for maintaining the restriction position, and the cutting blade can be easily replaced.

  In the above configuration, the apparatus further includes a motor having a motor shaft that is driven to rotate, the output shaft rotates in response to rotation from the motor, and the rotation restricting member is one of the motor shaft and the output shaft. A shaft engaging portion engageable with one of the shafts, and the shaft engaging portion engages either one of the motor shaft and the output shaft to restrict relative rotation of the output shaft with respect to the housing. It is preferable that it is comprised.

  According to this configuration, since the rotation restricting member is provided with the shaft engaging portion that can be engaged with either the motor shaft or the output shaft, it is possible to restrict the rotation of the output shaft with a simple configuration. Become.

  The holding portion is provided on the rotation restricting member and a protrusion protruding from the protective cover in the axial direction of the motor shaft, and is engaged with the protrusion when the rotation restricting member is located at the restricting position. It is preferable to have a protective cover engaging portion capable of holding the protective cover in the rotating position by combining.

  According to this configuration, since the protective cover can be held in the rotating position by holding the rotation restricting member in the restricting position when the cutting blade is replaced, the cutting blade can be easily replaced. In addition, since the holding portion is provided on the rotation restricting member and the protective cover, it is possible to suppress an increase in the number of parts.

  The holding portion protrudes in the axial direction of the motor shaft from the rotation restricting member, and protrudes in the axial direction of the motor shaft from the protective cover, and the protective cover is located at the rotation position. In some cases, it is preferable to have a rotation restricting member engaging portion capable of holding the rotation restricting member at the restricting position by engaging with the contact portion.

  According to such a configuration, since the rotation restricting member can be held in the restricting position by holding the protective cover in the rotating position when the cutting blade is replaced, the cutting blade can be easily replaced. In addition, since the holding portion is provided on the rotation restricting member and the protective cover, it is possible to suppress an increase in the number of parts.

  A base having a mounting surface on which the work material can be placed; a cutting part that rotatably supports the cutting blade; and a base and a front side of the cutting blade provided between the base and the cutting part. It is preferable to further include a tilting portion that can change the angle with the placement surface.

  According to such a configuration, it is possible to easily replace the cutting blade in a cutting machine in which the cutting portion can tilt.

  Further, the present invention provides a housing that rotatably supports an output shaft to which a cutting blade can be mounted, an initial position that is rotatably supported by the housing and covers the cutting blade to the maximum, and a predetermined angle from the initial position. A protective cover movable between the rotated position, a restricting position for restricting relative rotation of the output shaft relative to the housing, and an allowable position for allowing relative rotation of the output shaft relative to the housing; And a rotation restricting member that can move between the two, and by operating either one of the protective cover or the rotation restricting member, it is possible to restrict the movement of the other Is provided.

  According to this configuration, by operating either one of the protective cover and the rotation restricting member, the movement of either one can be restricted, so that the cutting blade can be easily replaced.

  The said structure WHEREIN: It is preferable that the said protective cover can be hold | maintained in the said rotation position by hold | maintaining the said rotation control member in the said control position.

  According to such a configuration, the protective cover can be held in the rotating position by holding the rotation restricting member in the restricting position, so that the cutting blade can be easily replaced.

  Moreover, it is preferable that the rotation restricting member can be held at the restricting position by holding the protective cover at the rotating position.

  According to this configuration, since the rotation restricting member can be held at the restricting position by holding the protective cover in the rotating position, the cutting blade can be easily replaced.

  Further, the movement of either one of the rotation restricting member and the protective cover can be restricted by engaging the held member provided on either one of the rotation restricting member and the protective cover. preferable.

  According to this configuration, since the holding member is provided on either the rotation restricting member or the protective cover and the held member is provided on either the rotation restricting member or the protective cover, an increase in the number of parts is suppressed. It becomes possible.

  Moreover, it is preferable that the said cutting blade is mounted | worn with the said output shaft through a fixing member, and the said rotation position is a position where the said fixing member is exposed at least.

  According to this configuration, the cutting blade can be easily replaced by holding the protective cover in the rotating position.

  Further, it is preferable that when the operation on one of the protective cover and the rotation restricting member is released, the restriction on the movement on the other is also released.

  According to such a configuration, when one of the protective cover and the rotation restricting member can return to the initial position or the allowable position, either one can return to the initial position or the allowable position. Therefore, operability is improved.

  Also, a cover urging member that gives a restoring force to return the protective cover to the initial position, and a regulating member urging member that gives a restoring force to the rotation restricting member to return to the allowable position. It is preferable.

  According to such a configuration, the protective cover and the rotation restricting member naturally return to the initial position and the permissible position after the cutting blade replacement operation, and therefore only the operation to either the protective cover or the rotation restricting member is released. Thus, both can be returned to the initial position, and it is not necessary for the operator to return the protective cover and the rotation restricting member to the initial position and the permissible position, thereby improving operability.

  According to the desktop cutting machine of the present invention, the cutting blade can be easily replaced.

It is a right view which shows the external appearance of the desktop circular saw concerning the 1st Embodiment of this invention. It is a left view which shows the external appearance of the tabletop circular saw concerning the 1st Embodiment of this invention. It is a front view which shows the external appearance of the desktop circular saw concerning the 1st Embodiment of this invention. It is a left view which shows the positional relationship of the housing of a desktop circular saw concerning the 1st Embodiment of this invention, a protective cover, and a spindle lock, a protective cover is located in an initial position, and a spindle lock is in an allowable position. The position is shown. It is a figure which shows the engagement relation of the processus | protrusion of the protection cover of the tabletop circular saw concerning the 1st Embodiment of this invention, and the protection cover holding member of a spindle lock, and the processus | protrusion and the protection cover holding member are engaging. Indicates no state. It is a left view which shows the positional relationship of the housing of a table-top circular saw concerning the 1st Embodiment of this invention, a protective cover, and a spindle lock, a protective cover is located in a rotation position, and a spindle lock is an allowable position. The state moved from is shown. It is a right view which shows the external appearance of the desktop circular saw concerning the 1st Embodiment of this invention, and has shown the state in which the protective cover is located in the rotation position. It is a left view which shows the positional relationship of the housing of a desk circular saw concerning the 1st Embodiment of this invention, a protective cover, and a spindle lock, a protective cover is located in a rotation position, and a spindle lock is a control position. The state located in is shown. It is a figure which shows the engagement relationship of the processus | protrusion of the protection cover of the desk circular saw and the protection cover holding member of a spindle lock concerning the 1st Embodiment of this invention, and a processus | protrusion and a protection cover holding member engage. It shows the state. It is a left view which shows the positional relationship of the housing of a desktop circular saw concerning the 2nd Embodiment of this invention, a protective cover, and a spindle lock, a protective cover is located in an initial position, and a spindle lock is in an allowance position. The position is shown. It is a left view which shows the positional relationship of the housing of a desk circular saw concerning the 2nd Embodiment of this invention, a protection cover, and a spindle lock, a protection cover rotates from an initial position, and a spindle lock is a control position. The state located in is shown. It is a left view which shows the positional relationship of the housing of a table-top circular saw concerning the 2nd Embodiment of this invention, a protective cover, and a spindle lock, a protective cover is located in a rotation position, and a spindle lock is a control position. The state located in is shown. It is a figure which shows the engagement relationship of the processus | protrusion of the protection cover of the desk circular saw concerning the 2nd Embodiment of this invention, and the to-be-held part of a spindle lock, and the state with which the processus | protrusion and the to-be-held part are engaging Is shown.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Here, a case where the present invention is applied to a tabletop circular saw will be described as an example.

  First, the configuration of a tabletop circular saw 1 that is an example of a cutting machine according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. The tabletop circular saw 1 is an electric cutting machine for cutting wood, aluminum sash, etc. (material to be cut). As shown in FIGS. 1 to 3, the base part 2, the holder 3, the rocker The moving support portion 4, the housing 5, a cutting portion 6 to which the circular saw blade P can be mounted, a motor 7, a protective cover 8 and a spindle lock 9 are included. 1, 2, and 3 are a right side view, a left side view, and a front view, respectively, showing the configuration of the tabletop circular saw 1 according to the embodiment of the present invention. The circular saw blade P is an example of the “cutting blade” in the present invention.

  In the following description, “up” shown in FIG. 1 is defined as an upward direction, “down” is defined as a downward direction, “front” is defined as a forward direction, and “rear” is defined as a backward direction. Further, in FIG. 1, the direction from the paper surface to the front is defined as the right direction, and the direction from the paper surface to the back is defined as the left direction. References to dimensions, numerical values, and the like in this specification include not only dimensions and numerical values that completely match the relevant dimensions and numerical values, but also substantially identical dimensions and numerical values (for example, within the range of manufacturing errors). ). Similarly, “same”, “perpendicular”, “parallel”, “match”, “same”, “substantially same”, “substantially orthogonal”, “substantially parallel”, “substantially match”, “substantially flush” Etc.

  As shown in FIGS. 1 to 3, the base portion 2 includes a base 21, a turntable 22, and a fence 23. The base 21 is an example of the “base” in the present invention.

  The base 21 is made of metal and is a part that can be placed on a floor surface or the like. The turntable 22 is made of metal, is connected to the base 21 via a rotation shaft orthogonal to the upper surface, and is disposed so that the upper surface is flush with the upper surface of the base 21. The upper surface of the base 21 and the upper surface of the turntable 22 define a mounting surface 2A on which a material to be cut can be mounted. The base 21 and the turntable 22 are formed with a groove portion (not shown) that allows the circular saw blade P to enter when the cutting portion 6 is lowered during the cutting operation.

  As shown in FIG. 3, the fence 23 is provided on the base 21 and includes a right fence 23A and a left fence 23B. As shown in FIGS. 1 and 2, the right fence 23 </ b> A and the left fence 23 </ b> B include a pressing surface 23 a that is orthogonal to the placement surface 2 </ b> A. When cutting the material to be cut, it is possible to perform stable cutting by bringing one surface of the material to be cut into contact with the pressing surface 23 a of the fence 23.

  A side handle 24 is provided at the front portion of the turntable 22. The side handle 24 is a portion that is operated by an operator when the turning operation of the turntable 22 and the rotation position fixing operation are performed.

  The holder 3 is provided between the base 21 and the swing support portion 4 and is supported by the base portion 2 so as to be tiltable, and the swing support portion 4 can be tilted and swingable with respect to the base portion 2. I support it. The holder 3 has a tilt shaft 31, a base 32, a swing support pin 33, and a spring 34. The holder 3 is an example of the “tilting part” in the present invention.

  The tilt shaft 31 extends in the front-rear direction in parallel with the mounting surface 2A of the base portion 2 at the rear portion of the turntable 22, and supports the base portion 32 so as to be tiltable with respect to the base portion 2 in the left-right direction.

  The base 32 is located at the rear of the turntable 22. The base portion 32 is provided with a clamp lever 35 for fixing the tilt angle of the swing support portion 4 supported by the holder 3 (an angle tilted with respect to the vertical direction in a front view) at a desired tilt angle. Specifically, when the clamp lever 35 is loosened, the holder 3 can tilt in the left-right direction around the axis of the tilting shaft 31 together with the swing support portion 4 supported by the holder 3. When the clamp lever 35 is tightened, the holder 3 is fixed at an arbitrary position with the swing support portion 4 supported by the holder 3 at an arbitrary position.

  The swing support pin 33 extends in the left-right direction, and is inserted through a through hole formed in each of the base 32 and the swing support portion 4. Accordingly, the swing support portion 4 is supported by the holder 3 so as to be swingable with respect to the base portion 2 around the axis of the swing support pin 33.

  The spring 34 urges the swing support 4 in the counterclockwise direction when viewed from the right side.

  The swing support portion 4 is supported by the holder 3 so as to be swingable and tiltable, and is connected to the cutting portion 6. Therefore, the swinging support portion 4 supported by the holder 3 swings around the axis of the swinging support pin 33, so that the cutting portion 6 swings up and down around the axis of the swinging support pin 33. Move. Further, the swinging support portion 4 supported by the holder 3 tilts about the axis of the tilt shaft 31, so that the cutting portion 6 tilts in the left-right direction about the axis of the tilt shaft 31. In other words, the holder 3 is provided between the base 21 and the cutting part 6, the angle between the side surface of the circular saw blade P and the mounting surface 2 </ b> A of the base 21 can be changed, and the circular saw blade P and the base 21. The distance from the mounting surface 2A can be changed.

  As shown in FIGS. 1 to 3, the housing 5 is disposed so as to cover the upper portion of the cutting portion 6. The housing 5 has a motor housing part 51, a saw cover 52 and a handle part 53. The housing 5 is an example of the “housing” in the present invention.

  The motor housing part 51 is formed in a substantially cylindrical shape extending in the left-right direction. The motor accommodating part 51 accommodates the motor 7 inside. A motor 7 indicated by a dotted line in FIG. 2 is an AC commutator motor and has a rotating shaft 71 extending in the left-right direction. The detailed configuration of the rotating shaft 71 will be described later.

  The saw cover 52 covers the upper part of the circular saw blade P, is connected to the right part of the motor accommodating part 51, and accommodates a power transmission mechanism (not shown).

  The handle portion 53 is connected to the rear portion of the motor housing portion 51 and includes a trigger switch 53A and a handle 53B. The handle 53B is a portion that is gripped when the operator swings or tilts the cutting portion 6, and has a substantially cylindrical shape. The trigger switch 53A is a manually operable switch that controls the start and stop of the motor 7, and is provided on the handle 53B.

  The cutting part 6 includes a power transmission mechanism (not shown), and has an output shaft 61 that is rotatably supported on the housing 5 via the power transmission mechanism and the power transmission mechanism. The power transmission mechanism decelerates the rotation of the motor 7 and transmits it to the output shaft 61. The cutting part 6 is an example of the “cutting part” in the present invention.

  The output shaft 61 is connected to the rotating shaft 71 of the motor 7 through a power transmission mechanism (not shown). A circular saw blade P is fixed to the right portion of the output shaft 61 via a bolt 62A and a flange 62B. The output shaft 61 and the circular saw blade P can rotate together. That is, the cutting part 6 supports the circular saw blade P in a rotatable manner. The bolt 62A is an example of the “fixing member” in the present invention.

  The spindle lock 9 is a member for restricting the rotation of the output shaft 61 that supports the circular saw blade P by a pushing operation when the circular saw blade P is exchanged (detached). As shown in FIGS. 3 to 5, the spindle lock 9 extends in the radial direction of the rotating shaft 71 of the motor 7. The spindle lock 9 includes an arm portion 91, a pressed portion 92, a restriction portion 93, a permission portion 94, and a claw portion 95. The spindle lock 9 is an example of the “rotation restricting member” in the present invention.

  The arm portion 91 extends in the radial direction of the rotation shaft 71 of the motor 7 (in the direction of arrow A and arrow B in FIG. 4; hereinafter, the arrow A direction and the arrow B direction are collectively referred to as the arrow AB direction). As shown in FIG. 3, when viewed in the front-rear direction, a part thereof protrudes to the outside of the motor housing portion 51. An abutting curved surface 91 </ b> A that is recessed with a certain curvature in the direction of the arrow B is defined at the end of the arm 91 in the direction of the arrow A. The claw portion 95 is engaged with a leaf spring 96 held in the housing 5, and the leaf spring 96 gives a restoring force to return the spindle lock 9 to an allowable position (initial position) via the claw portion 95. The leaf spring 96 is an example of the “regulating member urging member” in the present invention. The claw portion 95 and the leaf spring 96 are not shown in FIGS.

  As shown in FIGS. 3 and 4, the pressed portion 92 is provided at the end in the arrow B direction of the arm portion 91 located outside the motor housing portion 51. The pressed portion 92 extends rightward from the arrow B direction end of the arm portion 91 (see FIG. 3). The pressed portion 92 is provided with a protective cover holding member 92A. FIG. 4 is a left side view showing the positional relationship between the housing 5, the protective cover 8 and the spindle lock 9 of the tabletop circular saw 1.

  As shown in FIG. 4, the protective cover holding member 92 </ b> A protrudes in the left-right direction and the direction orthogonal to the arrow AB direction. In the arrow AB direction, the pressed portion 92 and the protective cover holding member 92A are flush with each other, and a pressed surface 92B that can be pressed from the outside by the operator in the arrow A direction is defined on the end surface in the arrow B direction.

  As shown in FIGS. 4 and 5, the restricting portion 93 is formed in a thin plate shape extending in the arrow AB direction. The restricting portion 93 is provided at an end portion in the arrow A direction of the arm portion 91 located inside the motor housing portion 51 in the arrow AB direction. The restricting portion 93 has a first restricting surface 93A and a second restricting surface 93B.

  93 A of 1st control surfaces are flat surfaces extended in the left-right direction and the arrow AB direction. The second restriction surface 93B is a flat surface extending in the left-right direction and the arrow AB direction, and is configured in parallel with the first restriction surface 93A. That is, the first restricting surface 93A and the second restricting surface 93B are opposed to each other in a direction orthogonal to the first restricting surface 93A and the second restricting surface 93B (a direction orthogonal to the arrow AB direction).

  As shown in FIG. 5, the allowable portion 94 is located downstream of the restricting portion 93 in the arrow A direction. In the allowance portion 94, an allowance surface 94A that is recessed with a constant curvature is defined.

  The arm portion 91, the pressed portion 92, the restriction portion 93, and the allowance portion 94 are integrally formed. Thereby, the arm part 91, the to-be-pressed part 92, the control part 93, and the permission part 94 (spindle lock 9) can move integrally in the arrow AB direction. Further, the spindle lock 9 is urged in the direction of arrow B by a leaf spring 96 (regulating member urging member).

  Next, the configuration of the rotating shaft 71 of the motor 7 will be described with reference to FIGS. 4 and 5 while showing the relationship with the spindle lock 9. The rotating shaft 71 is an example of the “motor shaft” in the present invention.

  As shown in FIGS. 4 and 5, an engaged portion 71 </ b> A is provided on the right portion of the rotating shaft 71 of the motor 7. The engaged portion 71A has a first engagement surface 71B and a second engagement surface 71C.

  The first engagement surface 71B is a flat surface extending in the left-right direction. The second engagement surface 71C is a flat surface extending in the left-right direction, and is configured in parallel with the first engagement surface 71B. The first engagement surface 71B and the second engagement surface 71C are connected by a curved surface 71D that protrudes with a constant curvature. The curvature of the curved surface 71D is configured to be the same as the curvature of the contact curved surface 91A of the arm portion 91, and is configured to be slightly smaller than the curvature of the allowable surface 94A of the allowable portion 94. As shown in FIG. 5, the distance between the first engagement surface 71B and the second engagement surface 71C is the distance between the first restriction surface 93A and the second restriction surface 93B of the spindle lock 9. Is configured to be slightly shorter.

  Next, the configuration of the protective cover 8 will be described with reference to FIGS. 1 to 4. The protective cover 8 has a protrusion 81. When the cutting portion 6 is located at the highest position, the protective cover 8 is urged by the torsion spring 82 in the clockwise direction in the right side view (the direction of arrow D in FIG. 4), and the lower portion of the circular saw blade P is Covering. Further, when the cutting portion 6 rotates downward, the protective cover 8 protrudes from the saw cover 52 relative to the saw cover 52 by the link mechanism 83 provided between the holder 3 and the protective cover 8. It is comprised so that rotation to the position which exposes the outer periphery of the circular saw blade P of the part to perform and the bolt 62A is possible. The protective cover 8 has a protrusion 81. The protective cover 8 is an example of the “protective cover” in the present invention.

  As shown in FIG. 3, the protrusion 81 protrudes from the left side surface of the protective cover 8 to the left (the axial direction of the rotating shaft 71). FIG. 4 is a left side view showing the positional relationship between the housing 5, the protective cover 8 and the spindle lock 9 of the tabletop circular saw 1. As shown in FIG. 4, the protrusion 81 has a thin plate shape extending from the inner end 81 </ b> B in the radial direction of the rotating shaft 71 of the protective cover 8 to the radially outer side of the rotating shaft 71. A contact surface 81A is defined on the end surface of the protrusion 81 in the arrow D direction.

  Next, the cutting operation of the workpiece W using the tabletop circular saw 1 according to the embodiment of the present invention will be described with reference to FIGS. The material to be cut W is an example of the “work material” in the present invention.

  When an operator performs a cutting operation, the handle 53B is gripped with the workpiece W placed on the mounting surface 2A of the base portion 2, and the trigger switch 53A is started with the finger of the hand gripping the handle 53B. The motor 7 is driven by performing an operation (pulling operation). When the motor 7 starts driving, the rotating shaft 71 of the motor 7 rotates and the output shaft 61 starts rotating via a gear (not shown). As the output shaft 61 rotates, the circular saw blade P supported by the output shaft 61 rotates.

  In this state, when the material to be cut W is cut at a cutting angle perpendicular to the mounting surface 2A, the handle 53B is held in a state where the trigger switch 53A is pushed in with a finger and the restoring force of the spring 34 and the cutting target are cut. Pushing down against the load accompanying cutting of the material W, the cutting part 6 is swung. As a result, the material to be cut placed on the base portion 2 is cut at a cutting angle perpendicular to the placement surface 2A by the rotating circular saw blade P.

  On the other hand, when the workpiece W is cut at a cutting angle that is not perpendicular to the mounting surface 2A of the base portion 2, the operator operates the clamp lever 35 to fix the holder 3 to the base portion 2. Is released. In this state, the operator moves the gripped handle 53B (handle portion 53) to the right. As the handle portion 53 moves to the right, the holder 3, the swing support portion 4, the housing 5, and the cutting portion 6 tilt about the axis of the tilt shaft 31. In this state, the operator uses the clamp lever 35 to fix the holder 3 to the base portion 2 at a desired tilt angle, and swings the cutting portion 6 to perform the cutting operation.

  Next, replacement (detachment) of the circular saw blade P will be described with reference to FIGS.

  As shown in FIG. 4, when no external force is applied to the tabletop circular saw 1, the spindle lock 9 is urged in the direction of arrow B by the leaf spring 96, and rotates with the allowable portion 74 in the direction of arrow AB. The engaged portion 71A of the shaft 71 is located at substantially the same position. In this state, since the curvature of the allowance surface 94A of the allowance portion 94 is slightly larger than the curved surface 71D of the engaged portion 71A, the engaged portion 71A (rotating shaft 71) is allowed to move to the allowance portion 94 (spindle). It is possible to rotate without interfering with the lock 9). As a result, the output shaft 61 connected to the rotation shaft 71 via a gear (not shown) can rotate relative to the housing 5. Hereinafter, the position of the spindle lock that allows the output shaft 61 to rotate relative to the housing 5 is referred to as an allowable position.

  The protective cover 8 is urged in the direction of arrow D by the torsion spring 82 and covers the lower part of the circular saw blade P. Hereinafter, the position of the protective cover that is urged in the direction of arrow D and covers the circular saw blade P to the maximum is referred to as the initial position. FIG. 4 shows a state in which the protective cover 8 is located at the initial position and the spindle lock 9 is located at the allowable position.

  When performing the operation of removing the circular saw blade P from the state shown in FIG. 4, the operator first moves the protective cover 8 relative to the housing 5 with the arrow C as shown in FIG. 6. Rotate a certain angle in the direction. At this time, as shown in FIG. 7, the bolt 62A is exposed in the right side view. Hereinafter, the position where the protective cover 8 is rotated with respect to the housing 5 and the head of the bolt 62A is exposed is referred to as the rotation position of the protective cover. In this case, as shown in FIG. 3, the arm portion 91 and the protrusion 81 are separated in the left-right direction, and as shown in FIG. Since the pressed portion 92 of the spindle lock 9 is not located on the locus E, the spindle lock 9 and the protective cover 8 do not interfere with each other. In this state, the protrusion 81 moves in the direction of arrow C and passes to the right of the arm portion 91. FIG. 7 is a right side view showing the positional relationship among the housing 5, the protective cover 8, and the spindle lock 9 of the tabletop circular saw 1, and shows a state where the protective cover 8 is located at the rotational position.

  Next, the operator presses the pressed surface 92B of the spindle lock 9 in the direction of arrow A as shown in FIG. At this time, the operator manually rotates the circular saw blade P, and the first restriction surface 93 </ b> A and the second restriction surface 93 </ b> B of the restriction portion 93 of the spindle lock 9 and the first portion of the engaged portion 71 </ b> A of the rotation shaft 71. The position where the engagement surface 71B and the second engagement surface 71C are parallel is searched. More specifically, as the circular saw blade P rotates, the output shaft 61 to which the circular saw blade P is fixed rotates, and further, the rotary shaft 71 connected to the output shaft 61 via a gear (not shown) rotates. By utilizing this, the first restricting surface 93A, the second restricting surface 93B, the first engaging surface 71B, and the second engaging surface 71C are searched for in a parallel state. FIG. 9 shows that the spindle lock 9 is pushed in the direction of the arrow A in a state where the first restricting surface 93A, the second restricting surface 93B, the first engaging surface 71B and the second engaging surface 71C are parallel to each other. As shown, the spindle lock 9 is movable to a position where the curved surface 71D and the contact curved surface 91A contact each other.

  In this state, the first restriction surface 93A and the first engagement surface 71B (second engagement surface 71C) are opposed to each other at substantially the same position in the direction orthogonal to the arrow AB direction, and the second restriction surface 93B and the second engagement surface. The surface 71C (first engagement surface 71B) faces at substantially the same position in a direction orthogonal to the arrow AB direction. Thereby, the rotation of the rotating shaft 71 is restricted, and the relative rotation of the output shaft 61 connected to the rotating shaft 71 via a gear (not shown) with respect to the housing 5 is restricted. Hereinafter, the position of the spindle lock that restricts relative rotation of the output shaft 61 with respect to the housing 5 is referred to as a restriction position. In the present embodiment, the spindle lock 9 is engaged with the engaged portion 71A provided on the rotating shaft 71 of the motor 7, thereby indirectly regulating the relative rotation of the output shaft 61 with respect to the housing 5. However, the spindle lock 9 may be directly engaged with the output shaft 61 to restrict relative rotation of the output shaft 61 with respect to the housing 5. The restricting portion 93 is an example of the “shaft engaging portion” in the present invention.

  Further, as shown in FIG. 9, in a state where the curved surface 71 </ b> D and the contact curved surface 91 </ b> A are in contact, the pressed portion 92 is on the locus E of the radially outer end portion of the rotation shaft 71 of the protrusion 81. Is located.

  In this state, when the operator releases the protective cover 8, the restoring force of the torsion spring 82 tries to rotate in the direction of the arrow D. As shown in FIGS. Is positioned on the locus E of the radially outer end of the rotation shaft 71 of the protrusion 81, the protective cover holding member 92 </ b> A of the pressed portion 92 contacts the contact surface 81 </ b> A of the protrusion 81 and the rotation of the protective cover 8. The rotation from the moving position to the initial position is restricted. That is, the protective cover 8 can be held in the rotational position by holding the spindle lock 9 in the restricting position. Here, the protective cover holding member 92A and the protrusion 81 constitute a “holding portion” in the present invention. Since the protective cover holding member 92A protrudes in the left-right direction and the direction orthogonal to the arrow AB direction, when the spindle lock 9 is pressed in the arrow A direction, the hand and the protrusion 81 do not interfere with each other and the operability is improved. . FIG. 8 is a left side view showing the positional relationship between the housing 5, the protective cover 8, and the spindle lock 9. The protective cover 8 is in the rotational position and the spindle lock 9 is in the restricting position. Is shown. FIG. 9 is a diagram showing an engagement relationship between the protrusion 81 of the protective cover 8 and the protective cover holding member 92A of the spindle lock 9, and shows a state in which the protrusion 81 and the protective cover holding member 92A are engaged. Yes. The protrusion 81 is an example of the “protrusion” in the present invention. The protrusion 81 is an example of the “member to be held” in the present invention. The protective cover holding member 92A is an example of the “protective cover engaging portion” in the present invention. The protective cover holding member 92A is an example of the “holding member” in the present invention.

  In this state (the state shown in FIG. 7), the operator uses a tool (such as a spanner) not shown to loosen the bolt 62 </ b> A and remove the flange 62 </ b> B and the circular saw blade P from the output shaft 61.

  Next, the operator attaches the circular saw blade P. More specifically, the flange 62B and the circular saw blade P are attached to the output shaft 61, and the bolt 62A is tightened using a tool (such as a spanner) (not shown).

  After the mounting operation, the operator releases his hand from the pressed surface 92B of the spindle lock 9. As shown in FIG. 4, the spindle lock 9 moves in the direction of the arrow B by the restoring force of the leaf spring 96 and returns to the allowable position when the pressing in the direction of the arrow A is released. That is, the leaf spring 96 provides a restoring force that returns the spindle lock 9 to the allowable position. Further, as shown in FIG. 5, since the pressed portion 92 of the spindle lock moves in a direction away from the locus E of the radially outer end of the rotation shaft 71 of the protrusion 81, the protrusion 81 and the protective cover The engagement with the holding member 92A is released, and the protective cover 8 is rotated in the direction of arrow D by the restoring force of the torsion spring 82 and returned to the initial position as shown in FIG. That is, the torsion spring 82 gives a restoring force that returns the protective cover 8 to the initial position. After the circular saw blade P is replaced, the protective cover 8 and the spindle lock 9 naturally return to the initial position and the allowable position, respectively. Therefore, the operator is aware of the protective cover 8 and the spindle lock 9 to the initial position and the allowable position. There is no need to return it, improving operability. The torsion spring 82 is an example of the “cover biasing member” in the present invention.

  Next, a tabletop circular saw 101, which is an example of a tabletop cutting machine according to the second embodiment of the present invention, will be described with reference to FIGS. The tabletop circular saw 101 according to the second embodiment basically has the same configuration as the tabletop circular saw 1 according to the first embodiment, and the protective cover 8 in the first embodiment is provided in the protective cover 8 according to the first embodiment. A protective cover 18 is provided instead, and a spindle lock 19 is provided instead of the spindle lock 9, which is different from the first embodiment. In addition, the structure same as the structure of the tabletop circular saw 1 attaches | subjects the same code | symbol, abbreviate | omits description, and mainly demonstrates a different structure.

  The spindle lock 19 is provided with a held portion 192 at the end in the arrow B direction of the arm portion 91 located outside the motor housing portion 51 in place of the pressed portion 92. The held portion 192 extends rightward from the arrow B direction end of the arm portion 91.

  The protective cover 18 is provided with a protrusion 181 instead of the protrusion 81. The protrusion 181 protrudes leftward from the left side surface of the protective cover 8. As shown in FIG. 10, the protrusion 181 has a thin plate shape extending from the end 181 </ b> B in the arrow D direction of the protective cover 18 in the arrow C direction. A holding surface 181 </ b> A is defined on the inner end surface of the protrusion 181 in the radial direction of the rotation shaft 71.

  Next, replacement work of the circular saw blade P of the tabletop circular saw 101 which is an example of the tabletop cutting machine according to the second embodiment will be described with reference to FIGS.

  The circular saw blade P is removed from a state in which no external force is applied to the tabletop circular saw 1 shown in FIG. 10 (the spindle lock 19 is in the allowable position and the protective cover 18 is in the initial position). When the work is performed, the worker first rotates the protective cover 18 in the direction of arrow C relative to the housing 5 as shown in FIG. 11. Next, the operator presses the held surface 192A of the spindle lock 19 in the direction of the arrow A, and moves the spindle lock 19 to the restriction position. FIG. 10 shows a state where the protective cover 18 is located at the initial position and the spindle lock 19 is located at the allowable position. FIG. 11 shows a state where the protective cover 18 is moved from the initial position and the spindle lock 19 is located at the restricting position.

  In this state, as shown in FIG. 12, the operator rotates the protective cover 18 in the direction of arrow C until reaching the rotation position and releases the hand from the held surface 192 </ b> A of the spindle lock 19. At this time, as shown in FIG. 13, the holding surface 181A of the protrusion 181 and the held surface 192A of the held portion 192 are engaged, and the spindle lock 19 is held in the restricted position. That is, the spindle lock 19 can be held at the restricting position by holding the protective cover 18 in the rotating position. Here, the held portion 192 and the protrusion 181 constitute a “holding portion” in the present invention. The protrusion 181 is an example of the “rotation restricting member engaging portion” in the present invention. The protrusion 181 is an example of the “holding member” in the present invention. The held portion 192 is an example of the “contact portion” in the present invention. The held portion 192 is an example of the “held member” in the present invention.

  When the operator removes his / her hand from the protective cover 18 after replacing the circular saw blade P, the engagement between the protrusion 181 and the held portion 192 is released. For this reason, as shown in FIG. 10, the protective cover 18 is rotated in the direction of arrow D by the restoring force of the torsion spring 82 and returned to the initial position. Further, the spindle lock 19 moves in the direction of arrow B by the restoring force of the leaf spring 96 and returns to the allowable position. After the circular saw blade P is replaced, the protective cover 18 and the spindle lock 19 naturally return to the initial position and the allowable position, respectively. Therefore, the operator is aware of the protective cover 18 and the spindle lock 19 to the initial position and the allowable position. There is no need to return it, improving operability.

  As described above, in the tabletop circular saw 1 and the tabletop circular saw 101 according to the embodiment of the present invention, the output shaft 61 on which the circular saw blade P can be mounted is rotatably supported, and the housing 5 is rotated. A protective cover that is supported in such a manner as to be able to cover the circular saw blade P to the maximum extent and a rotational position that is rotated by a predetermined angle from the initial position, and a relative rotation of the output shaft 61 relative to the housing 5. A spindle lock that is movable between a restriction position that restricts rotation and an allowable position that allows relative rotation of the output shaft 61 with respect to the housing 5, and operates either the protective cover or the spindle lock. Thus, the other movement can be regulated. This makes it easy to hold either the protective cover or the spindle lock in the rotation position or the restriction position when replacing the circular saw blade P, so that the other can be held in the restriction position or the rotation position. It becomes possible to replace the circular saw blade P.

  Further, the spindle lock 9 and the spindle lock 19 have a restricting portion 93 that can be engaged with either the rotating shaft 71 or the output shaft 61, and the restricting portion 93 is one of the rotating shaft 71 and the output shaft 61. Since the rotation of the output shaft 61 with respect to the housing 5 can be restricted by engaging with the rotation of the output shaft 61, the rotation of the output shaft 61 can be restricted with a simple configuration.

  Further, when the operation on one of the protective cover and the spindle lock is released, the restriction on movement with respect to the other is also released. As a result, when one of the protective cover and the rotation restricting member can return to the initial position or the allowable position, either one can return to the allowable position or the initial position. Improves.

  In the present embodiment, the table circular saw 1 and the table circular saw 101 have been described as examples of the cutting machine. However, the present invention is a cutting machine driven by a motor other than the table circular saw, for example, an electric circular saw, a chip saw cutting. It can also be applied to a cutting machine such as a machine.

DESCRIPTION OF SYMBOLS 1,101 ... Desktop circular saw 2 ... Base part 3 ... Holder 4 ... Swing support part 5 ... Housing 6 ... Cutting part 7 ... Motor 8, 18 ... Protective cover 9, 19 ... Spindle lock 21 ... Base 61 ... Output shaft 71 ... Rotating shafts 81, 181 ... Protrusions 82 ... Torsion springs 83 ... Link mechanisms 91 ... Arms 92 ... Pressed parts 92A ... Protective cover holding members 93 ... Regulators 94 ... Allowable parts 192 ... Holded parts

Claims (12)

A housing that rotatably supports an output shaft on which a cutting blade can be mounted;
A protective cover that is rotatably supported by the housing and is movable between an initial position that covers the cutting blade as much as possible and a rotational position that is rotated by a predetermined angle from the initial position;
A rotation restricting member movable between a restricting position for restricting relative rotation of the output shaft with respect to the housing and an allowable position for allowing relative rotation of the output shaft with respect to the housing;
When either one of the protective cover and the rotation restricting member is located at the turning position or the restricting position, either the protective cover or the rotation restricting member is taken as the restricting position or the turning position. And a holding part that can be held on the cutting machine. A motor having a motor shaft for rotational driving;
The output shaft rotates in response to rotation from the motor,
The rotation restricting member has a shaft engaging portion that can be engaged with either the motor shaft or the output shaft, and the shaft engaging portion is one of the motor shaft and the output shaft. 2. The cutting machine according to claim 1, wherein the cutter is configured to be able to regulate relative rotation of the output shaft with respect to the housing by being engaged.   The holding portion is provided on the rotation restriction member and a protrusion protruding from the protective cover in the axial direction of the motor shaft, and engages with the protrusion when the rotation restriction member is located at the restriction position. The cutting machine according to claim 2, further comprising: a protective cover engaging portion capable of holding the protective cover in the rotating position.   In the case where the holding portion protrudes from the rotation restricting member in the axial direction of the motor shaft, and protrudes in the axial direction of the motor shaft from the protective cover, and the protective cover is located at the rotation position. The cutting machine according to claim 2, further comprising: a rotation restricting member engaging portion capable of holding the rotation restricting member at the restricting position by engaging with the contact portion. A base having a mounting surface on which a workpiece can be mounted;
A cutting portion that rotatably supports the cutting blade;
5. The apparatus according to claim 1, further comprising a tilting portion that is provided between the base and the cutting portion and is capable of changing an angle between a side surface of the cutting blade and the mounting surface. The cutting machine according to item. A housing that rotatably supports an output shaft on which a cutting blade can be mounted;
A protective cover that is rotatably supported by the housing and is movable between an initial position that covers the cutting blade as much as possible and a rotational position that is rotated by a predetermined angle from the initial position;
A rotation restricting member movable between a restricting position for restricting relative rotation of the output shaft relative to the housing and an allowable position for allowing relative rotation of the output shaft relative to the housing;
A cutting machine characterized in that the movement of either one of the protective cover and the rotation restricting member can be restricted by operating one of them.   The cutting machine according to claim 6, wherein the protective cover can be held at the rotating position by holding the rotation restricting member at the restricting position.   The cutting machine according to claim 6, wherein the rotation restricting member can be held at the restricting position by holding the protective cover at the rotating position.   The holding member provided on either the rotation restricting member or the protective cover engages with the held member provided on the other, so that the movement of the other can be restricted. The cutting machine according to any one of claims 6 to 8. The cutting blade is attached to the output shaft via a fixing member,
The cutting machine according to claim 9, wherein the rotation position is a position where at least the fixing member is exposed.   The cutting machine according to claim 10, wherein when the operation on one of the protective cover and the rotation restricting member is released, the restriction on movement with respect to the other is also released. A biasing member for the cover that gives a restoring force to return the protective cover to the initial position
The cutting machine according to claim 11, further comprising a regulating member urging member that applies a restoring force to the rotation regulating member to return to the allowable position.

Images