WO2017208708A1 - Circular saw - Google Patents

Abstract

Provided is a circular saw in which a maximum cutting depth of a cutting blade can be adjusted. The provided circular saw comprises: a base 4 which has an opening 4a allowing a cutting blade 6 to protrude therethrough, and to and from which it is possible to attach and detach a sub-base 7 that can slide on a material to be cut and that has a prescribed thickness; a motor 2 that rotationally drives the cutting blade; a housing 3 that covers the cutting blade while supporting and accommodating the motor, and that is pivotally supported about the axis of a pivotal shaft with respect to the base so as to be able to change the amount of protrusion of the cutting blade; and an adjustment mechanism 5 that adjusts the amount of protrusion of the cutting blade in order to adjust the cutting depth with respect to the material to be cut. The circular saw is characterized in that the adjustment mechanism is configured such that a maximum value of the cutting depth in a mounted state in which the sub-base is mounted on the base and a maximum value of the cutting depth in a non-mounted state in which the sub-base is not mounted are equal to each other.

Description

Circular saw

The present invention relates to a circular saw, and more particularly to a cutting machine capable of attaching a sub-base.

As a conventional cutting machine, there is a configuration that includes a housing that houses a motor and supports a cutting blade, and a base that is provided at the lower part of the housing and projects the cutting blade downward, and the sub-base is detachable on the lower surface of the base. Known (Patent Document 1).

Japanese Patent Laying-Open No. 2015-71228

In the conventional cutting machine, when the sub-base is mounted on the base, there is a problem that the cutting amount of the cutting blade is reduced by the thickness of the sub-base and the cutting depth is reduced. This is a common problem with a circular saw, which is a type of cutting machine.

In view of such a situation, the present invention provides a circular saw capable of preventing a reduction in cutting depth even when a sub-base is mounted on a base.

In order to solve the above-described problems, the present invention provides a base in which an opening for projecting a cutting blade is formed, a sub-base having a predetermined thickness that is slidable on a cutting material is detachable, and the cutting blade is rotationally driven. And a motor that supports and accommodates the motor, covers the cutting blade, and is supported so as to be able to swing with respect to the base about the axis of the swinging shaft so that the protruding amount of the cutting blade can be changed. And an adjusting mechanism that adjusts the depth of cutting with respect to the cutting material by adjusting the protrusion amount of the cutting blade, and the adjusting mechanism has the notch in a mounted state in which the sub-base is mounted on the base. Provided is a circular saw characterized in that the maximum value of the depth is equal to the maximum value of the cutting depth in a non-mounted state in which the sub-base is not mounted.

According to the above configuration, the maximum cutting depth of the cutting blade can be made equal to that in the non-mounted state even in the sub-base mounted state. That is, loss of the maximum cutting depth due to the thickness of the sub-base can be prevented. A cutting material that can be cut in the non-attached state of the sub-base can be selected as a cutting work target even in the work in the non-attached state.

The adjustment mechanism has an abutting member that can abut against the housing and can change a position relative to the base between a first position and a second position. By changing the position of the abutting member, the adjustment mechanism It is preferable to change the swing position with respect to the base so that the maximum value of the cutting depth can be adjusted.

According to the above configuration, by changing the position of the contact member, the maximum depth of cut can be made equal to that in the non-mounted state even in the sub-base mounted state. Therefore, the maximum cutting depth can be adjusted with a simple structure and a simple operation. Further, loss of the maximum cutting depth due to the thickness of the sub-base can be prevented. A cutting material that can be cut in the non-attached state of the sub-base can be selected as a cutting work target even in the work in the non-attached state.

The adjusting mechanism supports the housing so as to be tiltable with respect to the base about a tilting axis orthogonal to the axis of the swing shaft so that the angle between the side surface of the cutting blade and the base can be changed. A first adjusting mechanism configured to be able to fix the swinging position of the housing, and a second adjusting mechanism provided with a corresponding contact member, the housing being in the second position in the non-mounted state. It is preferable that the contact member is in contact with the contact member and in contact with the first adjustment mechanism in the mounted state, and the contact member is in the first position.

The first adjustment mechanism is connected to the sub-link so as to be tiltable with respect to the base about the tilt axis, and is connected to the sub-link so as to be tiltable integrally, and the swing position of the housing can be fixed. The housing is in contact with the corresponding contact member in the second position in the non-mounted state, and in contact with the sub-link in the mounted state, and the corresponding contact member is in the first position. It is preferable.

According to the above configuration, when the housing is not mounted, the maximum cutting depth of the cutting blade can be maintained by contacting the first adjusting mechanism or the sub link even when the housing is tilted. Further, in the sub-base mounted state, the maximum depth of cut can be adjusted by the housing contacting the contact member.

The sub-base can contact the corresponding contact member in the mounted state, and the corresponding contact member moves from the second position to the first position in conjunction with mounting of the sub-base to the base; It is preferable that the sub-base moves from the first position to the second position in conjunction with being removed from the base.

According to the above configuration, the contact member is moved in conjunction with the attachment / detachment of the sub-base, so that the maximum cutting depth is automatically adjusted by the attachment / detachment of the sub-base. Therefore, the user can easily adjust the maximum cutting depth without operating the adjustment mechanism. In addition, since the movement of the contact member is interlocked with the attachment / detachment of the sub-base, the user can surely carry out the adjustment of the maximum cutting depth without forgetting.

The second adjustment mechanism further includes a biasing member that biases the corresponding contact member in a direction from the first position toward the second position, and the corresponding contact member is provided to be rotatable with respect to the base. It is preferable that when the sub-base is mounted, the sub-base can be rotated in contact with the sub-base.

According to the above configuration, since the urging member is provided, it is possible to prevent the contact member from moving freely during work. For this reason, inadvertent fluctuations in the maximum depth of cut during work are prevented.

It is preferable that the second adjustment mechanism is connected to the sub link so as to be integrally tiltable.

The second adjustment mechanism further includes a biasing member that biases the corresponding contact member in a direction from the first position toward the second position, and the corresponding contact member includes the second position and the first position. It is preferable to be able to move between them linearly.

According to the above configuration, since the second adjustment mechanism can be tilted integrally with the sub link, a mechanism that maintains the contact between the housing and the second adjustment mechanism even when tilted can be realized with a simple structure. it can.

The adjustment mechanism is a sub-support that is tiltably supported with respect to the base about a tilting axis perpendicular to the axis of the swinging shaft so that the angle between the side surface of the cutting blade and the base can be changed. A link mechanism and a link mechanism that is connected to the sub-link so as to be integrally tiltable and capable of fixing the swing position of the housing, and the corresponding contact member is capable of approaching and separating from the tilting shaft. It is preferable to provide a screw that is screwed into the sub link.

According to the above configuration, the tiltable sub link is provided with a screw, and the swing position of the housing is changed by changing the position of the screw. Therefore, the swing position is changed at any tilt angle. It is possible to maintain. In addition, the adjustment mechanism can be realized with a simple structure.

According to the circular saw of the present invention, it is possible to provide a circular saw capable of preventing the cutting depth from being reduced even when the sub-base is attached to the base.

The side view of the circular saw in the 1st Embodiment of this invention. FIG. 2 is a cross-sectional view of the circular saw according to the first embodiment of the present invention taken along line II-II in FIG. (A) An exploded perspective view of a base and an adjustment mechanism of a circular saw in the first embodiment of the present invention, (b) a side view and (c) a rear view of a stopper plate, and (d) a top view of a sub link. (E) Side view and (f) Front view. It is the rear view of the circular saw in the 1st Embodiment of this invention, Comprising: The figure which showed the partial cross section. The rear view at the time of tilting of the circular saw in the 1st Embodiment of this invention, Comprising: The figure which showed the partial cross section. It is a side view of the circular saw in the 1st Embodiment of this invention, Comprising: The figure which shows the state which mounted | wore with the subbase. It is the rear view which shows the state which mounted | wore with the sub base of the circular saw in the 1st Embodiment of this invention, Comprising: The figure which showed a partial cross section. The rear view at the time of tilting in the state which mounted | wore with the sub-base of the circular saw in the 1st Embodiment of this invention, Comprising: The figure which showed the partial cross section. The disassembled perspective view of the base used for the circular saw in the 2nd Embodiment of this invention, a sub base, and an adjustment mechanism. It is a side view of the circular saw in the 2nd Embodiment of this invention, Comprising: (a) The state which mounted | wore the subbase (partial cross section), and (b) The figure which shows the state which did not mount | wear with a subbase. FIG. 11A is a top view of a base and an adjustment mechanism used in a circular saw according to a second embodiment of the present invention, and FIG. 11B is a cross-sectional view taken along the line 11b-b in a state where a sub-base is mounted. FIG. (A) Top view and (b) Cross-sectional view taken along line bb and 12b of the base and adjusting mechanism used in the circular saw in the second embodiment of the present invention, with the sub-base not attached The figure which shows a state. It is a side view of the circular saw in the 3rd Embodiment of this invention, Comprising: The figure which shows the state which mounted | wore with the subbase. It is a side view of the circular saw in the 3rd Embodiment of this invention, Comprising: The figure which shows the state which did not mount | wear with a subbase.

<First Embodiment> A circular saw 1 according to a first embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the circular saw 1 includes a motor 2, a housing 3, a base 4, an adjustment mechanism 5, and a cutting blade 6. As shown in FIGS. 6 to 8, the base 4 can be mounted with a sub-base 7 on the lower surface thereof.

For convenience of explanation, the direction of the circular saw 1 is determined based on the viewpoint of the circular saw 1 from the user. Specifically, the vertical and forward / backward directions are determined in the directions indicated by the arrows in FIG. The front side in FIG. 1 is the right side of the circular saw 1, and the back side of the paper is the left side of the circular saw 1.

The motor 2 is accommodated in the housing 3 as shown in FIG. The motor 2 has a rotating shaft 2A extending in the left-right direction, and includes a pinion 21 fixed to the right end portion of the rotating shaft 2A. The pinion 21 is engaged with a reduction mechanism (not shown) composed of a plurality of gears, and the reduction mechanism (not shown) is engaged with the gear 22 below the pinion 21. The gear 22 is fixed to the left end portion of the output shaft 23 extending left and right, and the cutting blade 6 is detachably attached to the right end portion of the output shaft 23. Specifically, the cutting blade 6 is sandwiched between the washer 24 and the output shaft 23. The washer 24 is fixed by a bolt 25 that is screwed to the output shaft 23.

With the above configuration, the driving force generated in the motor 2 is transmitted to the cutting blade 6 via the pinion 21, a reduction mechanism (not shown), the gear 22, and the output shaft 23.

As shown in FIG. 1, the housing 3 forms an outer shell of the circular saw 1 and accommodates the motor 2 and the like. The housing 3 includes a saw cover 31 that covers the upper portion of the cutting blade 6, a protective cover 32 that covers the lower portion of the cutting blade 6, a handle 33, a trigger 34, a grip 35, a gear 22, and a gear cover 36 that houses the output shaft 23. And a motor housing portion 37 for housing the motor 2, the pinion 21, and a speed reduction mechanism (not shown).

The saw cover 31 is disposed on the right side of the handle 33 so as to cover the upper portion of the cutting blade 6. The protective cover 32 is provided so as to cover the rear part and the lower part of the cutting blade 6. Further, the protective cover 32 is disposed in a nested manner inside the saw cover 31 and is rotatable along the outer edge of the cutting blade 6 around the output shaft 23. A spring (not shown) is interposed between the protective cover 32 and the saw cover 31, and the spring (not shown) biases the protective cover 32 against the saw cover 31 in the rotation direction of the cutting blade 6. That is, the protective cover 32 is biased counterclockwise when viewed from the right side.

The handle 33 has a substantially D shape in side view and extends above the motor housing portion 37. The handle 33 extends from the front to the rear so that the user can easily hold it. A trigger 34 that is electrically connected to the motor 2 and is used for driving and stopping the motor 2 is provided below the handle 33. As shown in FIG. 4 and the like, a grip 35 that extends to the left from the handle 33 and is gripped by the user is provided at the rear portion of the handle 33.

The gear cover 36 extends further to the right from the right part of the motor housing part 37 (FIG. 2). The lower surface of the gear cover 36 is formed on a substantially flat plate. The gear cover 36 constitutes the lower part of the housing 3 and accommodates the gear 22 and the output shaft 23. From the right end of the gear cover 36, the output shaft 23 projects rightward.

As shown in FIG. 3, the base 4 is a substantially flat plate-like member that extends in the front-rear and left-right directions below the circular saw 1. The lower portion of the base 4 is formed in a substantially flat shape so as to be in contact with the workpiece and to be slidable. The base 4 supports the housing 3 so as to be tiltable about the tilting shaft 4A, and the angle of the cutting blade 6 with respect to the base 4 can be adjusted. Further, the base 4 supports the front end portion of the saw cover 31 so as to be swingable via the swing shaft 3A (FIG. 1), so that the protruding amount of the cutting blade 6 from the base 4 can be adjusted.

An opening 4a is formed in the right part of the base 4 in the front-rear direction. The cutting blade 6 is arrange | positioned so that it may protrude below through the opening part 4a (FIG. 1). Further, a screw hole 4b penetrating in the front-rear direction is formed in the rear portion of the base 4. The inside of the screw hole 4b is threaded and used to fix the sub-base 7.

A bevel plate 41 extending upward is provided on the upper surface of the rear portion of the base 4, and a connection plate 42 extending upward is provided on the upper surface of the front portion.

The bevel plate 41 is a substantially flat plate-like member that forms a substantially fan shape in rear view. A locking hole 41 a penetrating in the front-rear direction is formed in the lower part of the bevel plate 41. The center of the locking hole 41a substantially coincides with the tilting shaft 4A. In the upper part of the bevel plate 41, long holes 41b and 41c are formed. The long holes 41b and 41c are formed in an arc shape over a predetermined length, and the center of the arc substantially coincides with the center of the locking hole 41a and the tilting shaft 4A.

The connection plate 42 is a substantially flat member that forms a substantially sector shape when viewed from the front. An engagement hole 42 a penetrating in the front-rear direction is formed in the lower portion of the connection plate 42. The center of the engagement hole 42a substantially coincides with the tilt axis 4A. A long hole 42 b is formed in the upper part of the connection plate 42. The long hole 42b is formed in an arc shape over a predetermined length, and the center of the arc substantially coincides with the center of the engagement hole 42a and the tilt shaft 4A.

A fixing tool (not shown) is inserted through the engagement hole 42a, and the fixing tool (not shown) engages with the front portion of the housing 3 so as to be tiltable. A butterfly bolt 44 is inserted back and forth in the long hole 42 b, and the butterfly bolt 44 is screwed into the front portion of the housing 3. The user can fix the tilting posture of the housing 3 with respect to the base 4 by operating the butterfly bolt 44. Specifically, when the user tightens the butterfly bolt 44, the head of the butterfly bolt 44 is pressed against the connection plate 42, and the housing 3 is fixed.

As shown in FIG. 3, the adjustment mechanism 5 mainly includes a stopper plate 51, a sub link 52, a link 53, and a spring 54.

As shown in FIG. 3, the stopper plate 51 is a substantially flat member and is disposed in front of the bevel plate 41. The stopper plate 51 includes an abutting portion 51A whose upper portion is formed in an arc shape, a base portion 51B, a hole 51c formed in the lower portion of the stopper plate 51, and a convex portion 51D.

The stopper plate 51 is disposed immediately before the bevel plate 41 so that the center of the hole 51c coincides with the tilt axis 4A. The stopper plate 51 is tiltably connected to the bevel plate 41 by inserting the shaft 52D through the hole 51c and the locking hole 41a.

As shown in FIG. 3A, the upper end of the contact portion 51A is formed in a substantially arc shape with the hole 51c as the center. The central angle of the arc is designed to be equal to or greater than the maximum tilt angle with respect to the base 4 of the housing 3. Since the maximum tilt angle in the circular saw 1 according to the present embodiment is 45 degrees, the upper portion of the contact portion 51A is formed in an arc shape with a central angle of 45 degrees. The contact portion 51 </ b> A has a function of restricting the downward swing of the housing 3 by contacting the rear end portion of the saw cover 31.

The base 51B is formed to protrude rightward at the lower part of the stopper plate 51. The base 51B is disposed above the screw hole 4b.

The convex portion 51D is formed to extend in the front-rear direction. The rear end portion of the convex portion 51D is arranged to engage with the long hole 41c.

The spring 54 is a coil spring and is disposed inside the long hole 41c. The upper end portion of the spring 54 abuts on the convex portion 51D of the stopper plate 51, and urges the convex portion 51D substantially upward along the shape of the long hole 41c. Therefore, the stopper plate 51 is urged clockwise in the rear view when the sub-base 7 is not attached.

As shown in FIG. 3, the sub link 52 is a substantially flat plate-like member and is disposed in front of the bevel plate 41 and the stopper plate 51.

The sub link 52 has a pair of arm portions 52A. A long hole 52 b is formed in the upper part of the sublink 52, and a hole 52 f is formed in the lower part of the sublink 52. The pair of arm portions 52 </ b> A includes two flat plates formed so as to extend in the front-rear direction, and constitutes the front portion of the sublink 52. The long hole 52b is formed so as to penetrate the sub-link 52 in the front-rear direction, and is formed in a substantially arc shape centered on the hole 52f in the front view. A washer 52E having a thickness substantially equal to that of the stopper plate 51 is disposed between the sub link 52 and the bevel plate 41. *

A contact portion 52G is formed on the upper right side of the sub link 52. The contact portion 52G has a function of restricting the downward swing of the housing 3 by contacting the rear end portion of the saw cover 31. The upper end of the contact portion 52G is positioned below the upper end of the contact portion 51A of the stopper plate 51. In the present embodiment, the upper end of the contact portion 52G is located about twice as low as the thickness of the sub-base 7 from the upper end of the contact portion 51A, specifically about 5 millimeters below the upper end of the contact portion 51A.

The sub link 52 is disposed in front of the stopper plate 51. The shaft 52D is inserted through the hole 52f, and the rear end portion of the shaft 52D is inserted through the locking hole 41a of the bevel plate 41 as described above. In this way, the sub link 52 is tiltably connected to the bevel plate 41.

A screw 52C is inserted through the long hole 52b in the front-rear direction. The screw 52 </ b> C is inserted into the washer 52 </ b> E and the long hole 41 b in addition to the long hole 52 b, and the rear end portion is screwed into the wing nut 43. The user can fix and change the tilting posture of the sub link 52 by fastening and releasing the wing nut 43. Specifically, when the user tightens the wing nut 43, the head of the wing nut 43 is pressed against the bevel plate 41, and the housing 3 is fixed. When the fastening of the butterfly bolt 44 is loosened and the fastening of the wing nut 43 is further loosened, the fixed state of the housing 3 is released, and the user can freely change the tilting posture of the housing 3.

The link 53 is a member that forms an arc shape in a side view. The link 53 is formed with a long hole 53b that penetrates the link 53 in the left-right direction and forms an arc shape in a side view. The link 53 is pivotally connected to the front end portions of the pair of arm portions 52A at the lower portion, and defines a rotation shaft 53A. Therefore, the link 53 can rotate around the rotation shaft 53A. Further, since the link 53 is connected to the front end portions of the pair of arm portions 52A, the link 53 can be tilted integrally with the sub link 52. The link 53 corresponds to the link mechanism of the present invention. The link 53 and the sub link 52 correspond to the first adjustment mechanism of the present invention.

The link 53 is connected to the saw cover 31 via a screw (not shown). Specifically, a screw (not shown) is inserted in the left and right direction into the long hole 53 b and screwed into the left side surface of the saw cover 31. The user can lock the saw cover 31 to the link 53 by tightening the top of a screw (not shown) to the link 53. That is, the link 53 has a function of changing and holding the swinging posture of the housing 3. Further, since the sub link 52 and the link 53 can be tilted integrally, the user can change the tilting posture of the housing 3 while maintaining the state in which the housing 3 is locked to the link 53.

The sub-base 7 is a substantially flat member that can be mounted on the lower surface of the base 4 (FIG. 6). In the present embodiment, the thickness of the sub-base 7 is about 2.5 millimeters.

The sub base 7 includes a mounting screw 72. For mounting the sub-base 7, as shown in FIGS. 7 and 8 are cross-sectional views around the stopper plate 51 and the mounting screw 72 for understanding the structure.

In the mounting operation of the sub base 7, the sub base 7 is brought into contact with the lower surface of the base 4, and the mounting screw 72 is inserted from the lower surface of the sub base 7 and screwed into the screw hole 4b (FIGS. 7 and 8). . The mounting screw 72 has a length that greatly exceeds the thickness dimension of the base 4 and the sub-base 7. Therefore, the mounting screw 72 protrudes from the upper surface of the base 4 in a state where it is screwed into the screw hole 4b for mounting the sub-base 7 (FIGS. 7 and 8). The upper end portion of the mounting screw 72 protruding from the upper surface of the base 4 is in contact with the base portion 51B disposed above the screw hole 4b. Since the base 51B is pushed upward by the mounting screw 72, the stopper plate 51 rotates counterclockwise when viewed from the rear against the biasing force of the spring 54 (FIGS. 6 to 8).

In the following description, the position where the mounting screw 72 is not screwed and the stopper plate 51 is rotated clockwise by the biasing force of the spring 54 (FIGS. 1 to 5) is defined as the second position. Define. The position (FIGS. 6 to 8) where the stopper plate 51 is rotated counterclockwise by the mounting screw 72 is defined as the first position. That is, the stopper plate 51 is configured to be movable between the first position and the second position in conjunction with the attachment / detachment of the sub base 7 to / from the base 4.

The operation of the circular saw 1 will be described below. When the user pushes the trigger 34, the motor 2 is started, and the driving force is transmitted from the pinion 21 to the output shaft 23 via a speed reduction mechanism and a gear 22 (not shown). Further, the driving force is transmitted from the output shaft 23 to the cutting blade 6.

The user performs a cutting operation by pressing and sliding the material to be cut against the lower portion of the base 4. When the base 4 is slid on the upper surface of the material to be cut, the front end portion of the protective cover 32 comes into contact with the material to be cut, and the protective cover 32 rotates clockwise as viewed from the right side against the urging force. It is also possible to perform bevel cutting by operating the wing nut 43 and the wing bolt 44, tilting the housing 3 about the tilting shaft 4A, and adjusting the angle of the cutting blade 6. Further, the amount of protrusion of the cutting blade 6 from the base 4 can be adjusted by swinging the housing 3. A detailed method for adjusting the protrusion amount is shown below.

The adjustment of the protruding amount of the cutting blade 6 will be described. As described above, the housing 3 can swing around the swing shaft 3A. As a swinging operation of the housing 3, the user operates a screw (not shown) inserted through the long hole 53 a to release the lock between the link 53 and the saw cover 31 and swings the housing 3 to an arbitrary position. Thereafter, by locking the saw cover 31 to the link 53, the user fixes and holds the swing position of the housing 3. As the housing 3 swings, the cutting blade 6 swings substantially vertically. Therefore, the protrusion amount of the cutting blade 6 from the base 4 can be changed, and therefore the cutting depth of the cutting blade 6 can be adjusted.

Here, the maximum value of the cutting depth of the cutting blade 6 (hereinafter referred to as “maximum cutting depth”) is defined by the saw cover 31 and the stopper plate 51 or the sub link 52. In particular, when the sub-base 7 is not attached (hereinafter referred to as “non-attached state”), the maximum cutting depth of the cutting blade 6 is defined by the saw cover 31 and the stopper plate 51.

The stopper plate 51 is disposed at the second position in a non-mounted state (FIGS. 1 to 5). The contact portion 51A of the stopper plate 51 in the second position is located above the contact portion 52G of the sub link 52 and can contact the rear end portion of the saw cover 31. For this reason, the downward swing of the housing 3 is regulated by the contact between the saw cover 31 and the stopper plate 51. That is, the maximum cutting depth of the cutting blade 6 in the non-mounted state is defined by the saw cover 31 and the stopper plate 51.

As will be described below, even when the housing 3 tilts, the contact between the saw cover 31 and the stopper plate 51 is maintained, and the maximum depth of cut is also kept constant.

As described above, the contact portion 51A of the stopper plate 51 forms an arc shape centered on the tilting shaft 4A. Therefore, as shown in FIG. 5, the rear end portion of the saw cover 31 can contact the contact portion 51A even when the housing 3 is tilted. Therefore, the maximum cutting depth of the cutting blade 6 is kept constant regardless of the tilting posture of the housing 3.

On the other hand, when the sub base 7 is mounted (hereinafter referred to as “mounted state”), the maximum cutting depth of the cutting blade 6 is defined by the saw cover 31 and the sub link 52. Details are described below.

The stopper plate 51 is disposed at the first position when the sub-base 7 is mounted (FIGS. 6 to 8). When in the first position, as shown in FIG. 6, the contact portion 51 </ b> A of the stopper plate 51 is disposed below the saw cover 31. For this reason, the contact portion 52G of the sub link 52 and the rear end portion of the saw cover 31 can be contacted. Therefore, the maximum cutting depth of the cutting blade 6 with the sub-base 7 attached is defined by the saw cover 31 and the sub-link 52.

As described above, the contact portion 52G is positioned below the contact portion 51A of the stopper plate 51 in the second position by about 5 millimeters. Here, the front end portion and the rear end portion of the saw cover 31 are supported, and the centers of the output shaft 23 and the cutting blade 6 are positioned in the vicinity of the front and rear midpoints of the front end portion and the rear end portion of the saw cover 31 in a side view (see FIG. 1). Therefore, as compared with the non-mounted state of the sub-base 7, the cutting blade 6 in the mounted state of the sub-base 7 is increased by about 2.5 millimeters and can swing downward. That is, the cutting blade 6 can swing downward by an amount corresponding to the thickness of the sub-base 7, and therefore the maximum cutting depth of the cutting blade 6 does not change even when the sub-base 7 is mounted.

As will be described below, even when the housing 3 is tilted with the sub-base 7 mounted, the contact between the saw cover 31 and the sub-link 52 is maintained, and the maximum cutting depth of the cutting blade 6 is also kept constant. It is.

The sub link 52 can tilt around the tilt axis 4A. The sub link 52 is locked to the saw cover 31, that is, the housing 3 via the link 53. Therefore, the sub link 52 can be tilted integrally with the housing 3 as shown in FIG. By tilting the sub link 52 integrally with the housing 3, the rear end portion of the saw cover 31 and the contact portion 52G can always contact each other regardless of the tilting posture (FIG. 8). Therefore, even when the sub-base 7 is mounted, the maximum cutting depth of the cutting blade 6 is kept constant regardless of the tilting posture of the housing 3.

According to the configuration of the present embodiment, the maximum cutting depth of the cutting blade 6 can be made equal in the mounted state and the non-mounted state of the sub-base 7. That is, loss of the maximum cutting depth due to the thickness of the sub base 7 can be prevented. Therefore, a cutting material that can be cut when the sub-base 7 is not mounted can be selected as a target for cutting work even when the sub-base 7 is mounted.

According to the configuration of the present embodiment, when the sub-base 7 is not attached, the maximum cutting depth of the cutting blade 6 can be maintained by contacting the stopper plate 51 even when the housing 3 is tilted. is there. When the sub base 7 is mounted, the maximum depth of cut can be adjusted by the housing 3 coming into contact with the sub link 52.

According to the configuration of the present embodiment, since the position of the stopper plate 51 is changed in conjunction with the attachment / detachment of the sub-base 7, the maximum cutting depth of the cutting blade 6 is automatically adjusted by the attachment / detachment of the sub-base 7. The Therefore, the user can easily adjust the maximum cutting depth without operating the adjustment mechanism 5. Further, since the movement of the stopper plate 51 is interlocked with the attachment / detachment of the sub-base 7, the user can surely carry out the adjustment of the maximum cutting depth without forgetting.

According to the configuration of the present embodiment, since the spring 54 is provided, the stopper plate 51 is prevented from moving from the second position when the sub-base 7 is not attached. This prevents accidental fluctuations in the maximum depth of cut during work.

As described above, in the first embodiment, the stopper plate 51 moves between the second position and the first position, and the swing position of the housing 3 and the maximum cutting depth of the cutting blade 6 are as follows. Realized the adjustment. However, the present invention is not limited to such an embodiment. The present invention includes various embodiments that facilitate adjustment of the maximum cutting depth of the cutting blade 6.

<Second Embodiment> A circular saw 101 according to a second embodiment will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Further, parts / members corresponding to parts / members constituting the circular saw 1 according to the first embodiment are denoted by reference numbers obtained by adding 100 to the drawing reference numbers of the first embodiment.

The adjustment mechanism 105 in the second embodiment includes a spring 154. The spring 154 is a coil spring, and a shaft 52D is inserted back and forth in the center of the coil. The spring 154 is disposed so as to be embedded in the bevel plate 141 (FIG. 11), and its front end abuts against the rear surface of the stopper plate 151 and biases it forward.

The washer 152E has a larger thickness than the stopper plate 151, unlike the washer 52E in the first embodiment.

The stopper plate 151 has a contact portion 151A at the top. The contact portion 151A is formed in a substantially rectangular shape when viewed from the front. The upper end of the contact portion 151A is located approximately 5 millimeters higher than the upper end of the contact portion 152G of the sub link 152 in front view or rear view.

The stopper plate 151 has a protruding portion 151E protruding forward, and the protruding portion 151E engages with the sub link 152 (FIGS. 9 and 11). When the protrusion 151E engages with the sub link 152, the stopper plate 151 and the sub link 152 can be tilted together.

The stopper plate 151 is movable between a rear first position (FIGS. 10A and 11) and a front second position (FIGS. 10B and 12). In the first position, the stopper plate 151 contacts the bevel plate 141. In the second position, the stopper plate 151 contacts the sub link 152. Since the stopper plate 151 is urged forward by the spring 154, the stopper plate 151 is disposed at the second position when the sub-base 107 is not attached (FIG. 10B).

As shown in FIG. 10, the sublink 152 is formed such that the lower part is bent forward.

As shown in FIG. 9, the sub-base 107 includes two protrusions 172 that protrude upward. The vertical dimension of the two protrusions 172 is sufficiently longer than the thickness of the base 4 and the sub-base 7. Note that the thickness of the sub-base 107 is about 2.5 millimeters as in the case of the sub-base 7 in the first embodiment.

A state where the sub-base 107 is mounted on the base 104 is shown in FIGS. When the sub-base 107 is attached to the base 104, the two protrusions 172 protrude greatly upward from the upper surface of the base 4. At this time, the two protrusions 172 are inserted between the stopper plate 151 and the sub link 152. Along with this, the stopper plate 151 moves backward and is arranged at the first position. In addition, a spring 154 is arranged between the two protrusions 172, and a force can be applied evenly on the left and right sides of the spring 154, so that the stopper plate 151 can be retracted appropriately.

When the sub base 107 is attached and the stopper plate 151 is disposed at the first position in conjunction with the sub base 107, the rear end portion of the saw cover 31 can come into contact with the contact portion 152G of the sub link 152.

FIGS. 10B and 12 show a state in which the sub-base 107 is not attached. In the non-mounted state, the sub-base 107 is biased forward by the spring 154 and is disposed at the second position. In this case, the rear end portion of the saw cover 31 can come into contact with the contact portion 151 </ b> A of the stopper plate 151.

The contact portion 151A is located 5 millimeters above the contact portion 152G of the sub link 152. Therefore, the maximum cutting depth of the cutting blade 6 does not change between the non-mounted state and the mounted state. That is, as compared with the non-mounted state, the cutting blade 6 in the mounted state of the sub-base 107 can swing downward by about 2.5 millimeters to cancel the thickness of the sub-base 107. Therefore, the maximum cutting depth is equal to that in the non-wearing state.

Further, the maximum cutting depth of the cutting blade 6 is maintained even when the housing 3 is tilted. Specifically, when the housing 3 tilts, the sub link 152 and the stopper plate 151 also tilt together. Therefore, the saw cover 31 can always come into contact with the stopper plate 151 when the sub-base 107 is not attached, regardless of the tilting posture, and can always come into contact with the sub-link 152 when it is attached. Therefore, the maximum cutting depth of the cutting blade 6 is maintained even during tilting.

According to the configuration of the second embodiment, when the sub-base 107 is not attached, the maximum cutting depth of the cutting blade 6 is maintained by being able to contact the stopper plate 151 even if the housing 3 is tilted. Is possible. When the sub base 107 is mounted, the maximum depth of cut can be adjusted by the housing 3 coming into contact with the sub link 152.

According to the configuration of the second embodiment, since the position of the stopper plate 151 is changed in conjunction with the attachment / detachment of the sub base 107, the maximum cutting depth of the cutting blade 6 is automatically set by the attachment / detachment of the sub base 107. Adjusted. Therefore, the user can easily adjust the maximum cutting depth without directly operating the adjustment mechanism 105. Further, the user can surely carry out the adjustment of the maximum cutting depth without forgetting.

According to the configuration of the second embodiment, since the spring 154 is provided, the stopper plate 151 is prevented from moving from the second position when the sub base 107 is not attached. For this reason, inadvertent fluctuations in the maximum depth of cut during work are prevented.

As described above, in the second embodiment, the stopper plate 151 is moved between the second position and the first position, and the swing position of the housing 3 and the maximum cutting depth of the cutting blade 6 are adjusted. However, the present invention is not limited to such an embodiment. The present invention includes various embodiments that facilitate adjustment of the maximum cutting depth of the cutting blade 6.

<Third Embodiment> A circular saw 201 according to a third embodiment will be described with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Further, parts / members corresponding to parts / members constituting the circular saw 1 according to the first embodiment are denoted by reference numbers obtained by adding 200 to the drawing reference numbers of the first embodiment.

A circular saw 201 with the sub-base 7 attached is shown in FIG. 13, and a non-attached circular saw 201 is shown in FIG. The adjustment mechanism 205 in the third embodiment does not include a stopper plate. A sub link 252 is arranged in front of the bevel plate 41. The sub link 252 can be tilted about the tilt axis 4A as in the other embodiments. Further, the sub-link 252 supports the link 53 so as to be able to tilt together and turn as in the first embodiment.

The sub link 252 includes a support portion 252H protruding forward (FIGS. 13 and 14). The support portion 252H is formed in a flat plate shape that extends in a substantially front-rear direction and a substantially left-right direction.

The sub link 252 has a screw 255 that is screwed into the support portion 252H. The screw 255 is screwed with the support portion 252H so that the shaft extends substantially in the vertical direction. The screw 255 is a headless hexagon socket head screw. A regular hexagonal recess that can be engaged with a hexagon wrench is formed at the top of the screw 255. The top portion of the screw 255 has a function of contacting the rear end portion of the saw cover 31.

The screw 255 is movable between a first position (FIG. 13) close to the tilt shaft 4A or the base 4 and a second position (FIG. 14) spaced apart.

The user can move the screw 255 substantially vertically between the first position and the second position by rotating the screw 255 with a hexagon wrench or the like and screwing the screw 255 back and forth with respect to the support portion 252H. it can. The moving distance of the screw 255 between the first position and the second position is about 5 millimeters. The top of the screw 255 in the first position is located closer to the tilt axis 4A by about 5 millimeters than the top of the screw 255 in the second position.

When the sub-base 7 is not attached, the screw 255 is disposed at the second position (FIG. 14). On the other hand, when the sub-base 7 is mounted, the cutting blade 6 can have the maximum cutting depth equal to the maximum cutting depth in the non-mounted state by disposing the screw 255 in the first position (FIG. 13). .

Details are described below. When the sub base 7 is mounted, the rear end portion of the saw cover 31 comes into contact with the top portion of the screw 255 at the first position. Therefore, the screw 255 can swing downward by about 5 millimeters as compared with the case where it abuts on the screw 255 at the second position. As a result, the cutting blade 6 can swing downward by about 2.5 millimeters, that is, by the thickness of the sub-base 7. Therefore, the maximum cutting depth of the cutting blade 6 can be kept constant regardless of whether the sub-base 7 is attached or not.

Even when the housing 3 is tilted, the maximum cutting depth of the cutting blade 6 is maintained. Specifically, the screw 255 is supported on the sublink 252. Since the sub link 252 can tilt about the tilt axis 4A, the distance of the screw 255 from the tilt axis 4A does not change even when the housing 3 tilts. Therefore, the maximum cutting depth of the cutting blade 6 is kept constant regardless of the tilting posture of the housing 3.

According to the configuration of the third embodiment, since the sub link 252 and the screw 255 can be tilted integrally with the sub link, the contact between the screw 255 and the saw cover 31 is maintained even when the housing 3 is tilted. . Further, a mechanism for adjusting the maximum cutting depth is realized by a simple configuration of the screw 255.

<Modification> In the above embodiment, the adjustment mechanisms 5, 105, and 205 have the sub-links 52, 152, and 252. However, the present invention is not necessarily configured to include sublinks.

For example, the present invention can be implemented even in a circular saw in which the adjustment mechanism does not include a sub-link and includes a mechanism that adjusts the swinging posture of the housing by the link. In this case, a stopper plate is disposed between the link and the bevel plate so that it can move between the first position and the second position. The maximum cutting depth of the cutting blade can be adjusted by bringing the saw cover into contact with the stopper plate at the second position when the sub-base is not attached and bringing the link and the saw cover into contact with the sub-base attached. is there.

Alternatively, the maximum cutting depth of the cutting blade may be adjusted by providing a screw on the link and moving the screw between the first position and the second position.

The present invention can also be implemented in a circular saw having a mechanism in which the saw cover comes into contact with the base. In this case, the maximum cutting depth of the cutting blade may be adjusted by disposing a contact member such as a screw or a stopper plate on the base and moving between the first position and the second position.

In each of the above embodiments, the stopper plates 51 and 151 and the screw 255 correspond to the contact member of the present invention. The springs 54 and 154 correspond to the biasing member of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Circular saw, 2 ... Motor, 3 ... Housing, 4 ... Base, 4A ... Tilt axis, 3A ... Swing axis, 5 ... Adjustment mechanism, 6 ... Cutting blade, 7 ... Sub base, 51 ... Stopper plate, 52 ... Sublink, 53 ... Link, 54 ... Spring, 101 ... Circular saw, 104 ... Base, 105 ... Adjustment mechanism, 107 ... Subbase, 141 ... Bevel plate, 151 ... Stopper plate, 152 ... Sublink, 154 ... Spring, 201 ... Circular saw, 251 ... Sublink, 252 ... Sublink, 255 ... Screw

Claims (9)

1. An opening for projecting the cutting blade is formed, a base on which a sub-base having a predetermined thickness is slidable and detachable, a motor that rotationally drives the cutting blade, and a motor that supports and accommodates the motor A housing that covers the cutting blade and is supported so as to be swingable about the axis of the swing shaft with respect to the base so that the protrusion amount of the cutting blade can be changed, and a protrusion amount of the cutting blade. An adjustment mechanism that adjusts the depth of cut with respect to the cutting material, and the adjustment mechanism has a maximum value of the depth of cut when the sub-base is mounted on the base, and the sub-base. A circular saw characterized in that it is configured so that the maximum value of the cutting depth in the non-attached and non-attached state is equal.
2. The adjustment mechanism has an abutting member that can abut against the housing and can change a position relative to the base between a first position and a second position. By changing the position of the abutting member, the adjustment mechanism 2. The circular saw according to claim 1, wherein the swing position with respect to the base is changed so that the maximum value of the cutting depth can be adjusted.
3. The adjusting mechanism supports the housing so as to be tiltable with respect to the base about a tilting axis orthogonal to the axis of the swing shaft so that the angle between the side surface of the cutting blade and the base can be changed. A first adjusting mechanism configured to be able to fix the swinging position of the housing, and a second adjusting mechanism provided with a corresponding contact member, the housing being in the second position in the non-mounted state. 3. The circular saw according to claim 2, wherein the circular saw is in contact with a contact member and in contact with the first adjustment mechanism in the mounted state, and the contact member is in the first position.
4. The first adjustment mechanism is connected to the sub-link so as to be tiltable with respect to the base about the tilt axis, and is connected to the sub-link so as to be tiltable integrally, and the swing position of the housing can be fixed. The housing is in contact with the corresponding contact member in the second position in the non-mounted state, and in contact with the sub-link in the mounted state, and the corresponding contact member is in the first position. The circular saw according to claim 3.
5. The sub-base can contact the corresponding contact member in the mounted state, and the corresponding contact member moves from the second position to the first position in conjunction with mounting of the sub-base to the base; The circular saw according to claim 4, wherein the sub-base moves from the first position to the second position in conjunction with being removed from the base.
6. The second adjustment mechanism further includes a biasing member that biases the corresponding contact member in a direction from the first position toward the second position, and the corresponding contact member is provided to be rotatable with respect to the base. 6. The circular saw according to claim 5, wherein when the sub-base is mounted, the circular saw can be rotated in contact with the sub-base.
7. The circular saw according to claim 5, wherein the second adjustment mechanism is connected to the sub link so as to be integrally tiltable.
8. The second adjustment mechanism further includes a biasing member that biases the corresponding contact member in a direction from the first position toward the second position, and the corresponding contact member includes the second position and the first position. The circular saw according to claim 7, wherein the circular saw can be moved linearly.
9. The adjustment mechanism includes a first adjustment mechanism and a second adjustment mechanism including a corresponding contact member, and the first adjustment mechanism is configured such that an angle between a side surface of the cutting blade and the base can be changed. A sub-link supported to be tiltable with respect to the base about a tilting axis orthogonal to the axis of the swinging shaft, and connected to the sub-link so as to be tiltable integrally, and the swing position of the housing A link mechanism that can be fixed, and the second adjustment mechanism has a screw that is screwed into the sub-link so as to be close to and away from the tilting shaft, The circular saw according to claim 2, wherein the circular saw is formed.

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