JP7309510B2 - desktop cutting machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a desktop cutting machine called a slide circular saw or a desktop circular saw, which is mainly used for cutting wood.

The desktop cutting machines described in Patent Documents 1 and 2 have a turntable horizontally rotatable with respect to a base, and a cutting machine main body vertically swingable with respect to the turntable. A material to be cut is placed on the upper surface of the turntable. A circular saw blade is rotated by the motor of the cutting machine body. The cutting machine body is lowered with respect to the table to cut the material to be cut with the circular saw blade. The tabletop cutting machine has a positioning device that adjusts the rotation angle of the turntable with respect to the base and determines the position before cutting the material to be cut. For example, the material to be cut can be cut in a direction perpendicular to the end face of the material to be cut (square cutting). Alternatively, the material to be cut can be cut at an angle (mitered angle) different from the right angle to the end face (so-called oblique cutting).

The positioning device positions the turntable at an arbitrary horizontal rotation angle (miter angle) with respect to the base. The positioning device has, for example, a first positioning mechanism for positioning at an arbitrary miter angle with respect to the base, and a second positioning mechanism for quickly positioning a predetermined miter angle, which is frequently used, by means of concave-convex engagement or the like. . The second positioning mechanism is composed of a plurality of positioning holes provided at regular angles in the base and positioning pins provided on the turntable. By inserting and withdrawing the positioning pin from the positioning hole, the turntable is positioned at a constant miter angle with respect to the base. The second positioning mechanism is also called a positive locking mechanism.

The fine adjustment mechanism shown in FIGS. 8 to 10 of Patent Document 1 is provided in the first positioning mechanism. The turntable has a table extension extending forward (toward the user). The first positioning mechanism shown in FIGS. 8 to 10 includes a fixed handle extending further forward from the table extension, an adjustment screw extending from the left and right sides of the table extension, and an adjustment screw provided inside the table extension. have a piece. A fixed handle and an adjustment screw thread into the piece generally perpendicular to each other. The rear end of the fixed handle can abut against the outer peripheral wall of the base. The fixed handle is locked to the base by abutment. Operation of the adjustment screw slightly moves the piece laterally relative to the table extension. As a result, the position of the turntable in the rotational direction can be finely adjusted while the fixed handle is engaged with the base. In other words, the miter angle can be finely adjusted while rotating the turntable with respect to the base.

In this case, the adjusting screw is positioned relatively far from the center of rotation of the turntable. As a result, the positions of the adjusting screws move greatly as the turntable rotates. Thus, the operability of the adjusting screw tends to be poor. In addition, the miter angle can only be adjusted over a small angular range (eg ±2°) around the miter angle positioned by locking the fixed handle to the arc of the base. Therefore, when finely adjusting the miter angle, it is necessary to operate both the fixed handle and the adjusting screw. Therefore, there is a tendency for the operation to be time-consuming.

The fine adjustment mechanism shown in FIGS. 33 to 35 of Patent Document 1 has an adjusting member for fine adjustment at the base of the fixed handle of the first positioning mechanism. A rack is provided on the outer peripheral wall of the base. The rear end of the adjustment member can be pushed rearward to engage with the rack of the arc portion. After moving the turntable to the vicinity of the predetermined angle, the miter angle can be finely adjusted while rotating the turntable by operating the adjusting member. In this case, the adjusting member of the second positioning mechanism has a shape in which the operation handle of the first positioning mechanism is sandwiched therebetween, and the operability tends to be poor.

The fine adjustment mechanism shown in FIGS. 49 and 50 of Patent Document 1 has a shaft member extending from the lower right side of the base toward the center of the base. An operating handle is provided on the first end of the shaft member, and the operating handle is positioned on the lower right side of the base. A pinion is provided at the second end of the shaft member. A rack is provided on the outer peripheral wall of the turntable, and a pinion is meshed with the rack. By rotating the pinion with the operating handle, the rack rotates together with the turntable on the horizontal plane with respect to the base. According to this configuration, the rack may be distorted due to the distortion of the turntable on which the material to be cut is placed. In other words, the durability of the pinion and rack is not high.

The fine adjustment mechanism shown in FIGS. 1 to 3 of Patent Document 2 has a lever portion provided on the side of the table extension portion. The table extension includes a fixed rod extending back and forth, and a supporting member that can rotate left and right about the axis of the fixed rod. The support member has an insertion hole through which the positioning pin of the second positioning mechanism is inserted. The support member is integral with the lever portion. By operating the lever portion, the support member rotates left and right, and the relative position of the insertion hole moves left and right. Thus, the relative position of the positioning pin of the second positioning mechanism in the circumferential direction with respect to the base can be slightly moved to finely adjust the miter angle of the turntable. This fine adjustment mechanism adjusts only in a small angular range around the miter angle positioned by the second positioning mechanism. Therefore, fine adjustment cannot be performed at an angle other than the predetermined angle that can be positioned by the second positioning mechanism.

Japanese Patent Application Laid-Open No. 2006-44220 Japanese Patent Application Laid-Open No. 2009-66718

Therefore, there is a demand for a mechanism capable of finely adjusting the miter angle of a turntable with good operability and high durability.

According to one aspect of the present disclosure, a tabletop cutter has a base, a turntable, and a cutter body. The turntable is rotatably provided on a horizontal plane with respect to the base. The cutting machine main body is positioned above the turntable and is connected to the turntable so as to be vertically swingable. The turntable has a substantially disk-shaped table body on which the material to be cut is placed, and a table extension portion projecting forward from the table body. The desktop cutting machine has an angle fine adjustment mechanism that adjusts a slight rotation angle of the turntable with respect to the base with good operability and accuracy. The angle fine adjustment mechanism has a rack provided on the base, a pinion, and an operating section. The pinion is provided on the table body so as to be positioned within the area of the table body when viewed from the top, and directly or indirectly engages the rack. The operation unit is gripped by a user to rotate the pinion.

The pinion is therefore located within the table body, i.e. near the center of rotation of the turntable. Therefore, the operation part for rotating the pinion is also located near the center of rotation of the turntable. Therefore, the distance that the operation unit moves along with the rotation of the turntable is relatively short and is located within a narrow area. This makes it easy to operate the operation unit. A rack is provided on the base. The base is less deformed over time than a turntable that is distorted by placing a material to be cut thereon. Therefore, the rack is more durable than the rack provided on the turntable.

According to another feature of the present disclosure, the pinion is arranged in the table body so as to be movable in the extending direction of the rotation shaft of the pinion to be engaged with the rack, and to be disengaged from the engagement position. provided in Therefore, by moving the pinion from the engaged position to the disengaged position, the turntable can be rotated without rotating the pinion. Therefore, the turntable can be rotated greatly. On the other hand, when the pinion is moved to the engagement position, the position of the turntable can be finely adjusted by the pinion. Moreover, since the pinion moves between engagement positions by linear motion, it is possible to easily switch on and off the transmission of the operating force to the rack.

According to another feature of the present disclosure, the rack has an arcuate rack body and a plurality of teeth extending radially from the rack body and aligned along the arc. The pinion is provided on the table body so that the axis of rotation of the pinion and the central axis of the arc of the rack body are parallel. Therefore, the axis of rotation of the pinion and the axis of rotation of the rack are parallel. Therefore, the transmission efficiency of the operating force from the pinion to the rack is increased. Thus, the turning motion of the turntable becomes smooth. The tooth spaces of the pinion and the tooth spaces of the rack are parallel. Therefore, the pinion can be easily moved in the direction of the rotation axis, and easily moved between the engagement position and the release position.

According to another feature of the present disclosure, the tabletop cutter has a spring biasing the pinion from the engaged position toward the disengaged position. Therefore, the pinion can be automatically moved to the release position when the turntable does not need to be finely adjusted with the operating part.

According to another feature of the present disclosure, the pinion and actuator are located along the outer peripheral rear region of the table body. On the other hand, the material to be cut is placed on the front area of the turntable. Therefore, the pinion and the operating portion are provided at positions that do not interfere with the material to be cut. Therefore, even after placing the material to be cut on the turntable, the user can easily operate the operation section.

According to another feature of the present disclosure, the table body has a table perimeter wall extending along the perimeter. The table outer wall has a front right wall portion located on the right side of the table extension portion and a front left wall portion located on the left side of the table extension portion. The operating portion protrudes radially outward from at least one of the front right wall portion and the front left wall portion. Therefore, since the operation part is located near the user, it is easy for the user to visually recognize the operation part. For example, before placing the material to be cut on the turntable, or in a state where the material to be cut that fits inside the turntable is placed on the turntable, the operation part is easy to see. This makes it easier for the user to operate the operation unit.

According to another feature of the present disclosure, a tabletop cutting machine has a first operating section, a first pinion, a second operating section, and a second pinion. The first operation portion protrudes from the front right wall portion of the table body as an operation portion. The first pinion rotates integrally with the first operating portion as a pinion. The second operating portion protrudes radially outward from the front left wall portion of the table body. The second pinion rotates integrally with the second operating portion. Therefore, the user can finely adjust the miter angle of the turntable by selecting either the first operating section or the second operating section. Therefore, even when the turntable is rotated to the right and the first operation part is moved to a place where it is difficult to operate, the second operation part can be operated. Even when the turntable is rotated to the left and the second operation part is moved to a place where it is difficult to operate, the first operation part can be operated. As a result, the miter angle of the turntable can be reliably and easily finely adjusted.

According to another feature of the present disclosure, the rack has an arcuate upwardly or downwardly facing rack body and a plurality of teeth projecting upwardly or downwardly from the rack body and arranged along the arc. The rack teeth and pinions are bevel gears. The pinion leaves the rack by moving radially from the rack.

Therefore, the pinion meshes with the rack obliquely with respect to the radial direction. Therefore, the pinion can be engaged with and disengaged from the rack in a short moving distance compared to a structure in which the pinion engages with the rack vertically. Alternatively, it can be engaged with and disengaged from the rack with a small frictional force. The rack is also oriented obliquely with respect to the turntable positioned above. Therefore, when a large downward force is applied from the turntable, the pinion slides obliquely downward along the rack. As a result, the force applied from the turntable to the rack can be reduced.

According to another feature of the present disclosure, the pinion and actuator are integrally formed to rotate together. Therefore, the operating force for operating the operating portion is directly transmitted to the pinion. Therefore, the pinion can be operated by the operating portion with a relatively small force. It is also possible to simplify the structure of the operation part and the pinion. Therefore, the cost of forming the operating portion and the pinion can be suppressed.

According to another feature of the present disclosure, a reduction mechanism is interposed between the pinion and the rack to reduce the rotational speed of the pinion and transfer it to the rack. Therefore, the rotation speed transmitted to the rack is reduced by the speed reduction mechanism compared to the rotation speed of the operating portion. Therefore, the miter angle of the turntable with respect to the base can be adjusted more finely. Moreover, for example, the diameter of the arcuate rack can be reduced. For example, the diameter of the rack can be reduced by providing a speed reduction mechanism, compared to a structure in which the rotation of the turntable with respect to the base is reduced by increasing the diameter of the rack. Thus, it is possible to achieve both fine adjustment of the miter angle and compactness of the desktop cutting machine.

According to another feature of the disclosure, the fine angle adjustment mechanism includes a clutch mechanism. The clutch mechanism cuts off the power that rotates the turntable with respect to the base when torque of a predetermined value or more is applied. Therefore, for example, the angle fine adjustment mechanism is operated when the turntable is fixed to the base. The immobility of the turntable restricts rotation of the pinion engaging the rack. As a result, the clutch mechanism is actuated by applying a torque of a predetermined value or more to the clutch mechanism. When the clutch mechanism operates, the angle fine adjustment mechanism idles, and unnecessary force is suppressed from being applied to the rack and pinion. Damage to the rack and pinion can thus be prevented. In addition, the idle rotation of the angle fine adjustment mechanism can easily notify the user that the turntable is fixed to the base.

According to another feature of the disclosure, the fine angle adjustment mechanism includes a clutch mechanism. The clutch mechanism cuts off the power that rotates the turntable with respect to the base when torque of a predetermined value or more is applied. The deceleration mechanism has a first shaft rotatable integrally with the operating portion, and a second shaft rotatable at a reduced speed with respect to the first shaft. A clutch mechanism is provided on the second shaft.

Therefore, the axial force applied to the second shaft when operating the angle fine adjustment mechanism is greater than that to the first shaft. Therefore, the torque received by the clutch mechanism is larger when it is provided on the second shaft than when it is provided on the first shaft. In other words, when the clutch mechanism is provided on the second shaft, a torque range that can be set is wide when setting a predetermined torque that enables the clutch mechanism to operate. Therefore, the degree of freedom in designing the clutch mechanism is high. In addition, a predetermined torque setting can be maintained without the need for fine adjustment. Furthermore, the predetermined torque can be set relatively high. Therefore, when operating the angle fine adjustment mechanism, the user does not need to finely adjust the operating force, and the operability is good.

According to another aspect of the present disclosure, a clutch mechanism has first and second cams that engage with each other to enable power transmission. Power is cut off by disengagement of the first cam and the second cam. A second cam is integrally formed with a pinion that directly engages the rack. Therefore, the number of parts can be reduced, and the fine angle adjustment mechanism can be made compact.

According to another aspect of the present disclosure, a tabletop cutter includes a base, a turntable, and a cutter body. The turntable is rotatably provided on a horizontal plane with respect to the base. The cutting machine main body is positioned above the turntable and is connected to the turntable so as to be vertically swingable. The desktop cutting machine has an angle fine adjustment mechanism that adjusts a slight rotation angle of the turntable with respect to the base with good operability and accuracy. The angle fine adjustment mechanism has a clutch mechanism. The clutch mechanism cuts off the power that rotates the turntable with respect to the base when torque of a predetermined value or more is applied.

Therefore, for example, the angle fine adjustment mechanism is operated when the turntable is fixed to the base. At this time, torque greater than or equal to a predetermined amount is applied to operate the clutch mechanism, causing the fine angle adjustment mechanism to idle. This prevents unnecessary force from being applied to each component of the angle fine adjustment mechanism. Thus, it is possible to prevent damage to various types of angle fine adjustment mechanisms, such as a type that finely adjusts the position of the turntable by engaging a rack and a pinion, and a type that finely adjusts the position of the turntable by rotating a screw. . In addition, the idle rotation of the angle fine adjustment mechanism can easily notify the user that the turntable is fixed to the base.

1 is an overall perspective view of a cutting machine according to a first embodiment; FIG. It is a left view of the cutting machine which concerns on 1st Embodiment. Fig. 2 is a right side view of the cutting machine according to the first embodiment; 1 is a front view of a cutting machine according to a first embodiment; FIG. 1 is a plan view of a cutting machine according to a first embodiment; FIG. It is a front view of a cutting machine when the cutting machine main body which concerns on 1st Embodiment is made to incline leftward. FIG. 4 is a plan view of the cutting machine according to the first embodiment when the cutting machine main body is tilted leftward; FIG. 4 is a plan view of the cutting machine according to the first embodiment when the cutting machine main body is slid forward; It is a top view of the cutting machine which removed the turntable which concerns on 1st Embodiment. FIG. 4 is a plan view of the cutting machine according to the first embodiment when the miter angle is the maximum in the right direction; FIG. 4 is a plan view of the cutting machine according to the first embodiment when the miter angle is left maximum. 5 is a cross-sectional view taken along line XII-XII in FIG. 4 when the positive lock mechanism is in the ON state; FIG. FIG. 13 is an enlarged view of part XIII of FIG. 12; FIG. 13 is a cross-sectional view corresponding to FIG. 12 when the positive lock mechanism is in the OFF state; 15 is an enlarged view of XV part of FIG. 14; FIG. 5 is a cross-sectional view taken along line XVI-XVI of FIG. 4; FIG. 17 is a partially enlarged view of XVII of FIG. 16; FIG. It is a perspective view of the adapter seen from the positioning part side. It is a perspective view of the adapter seen from the battery attachment part side. FIG. 10 is a perspective view of the adapter and the battery being attached/detached to/from the adapter as seen from the positioning part side; FIG. 4 is a perspective view of the adapter and the battery being attached/detached to/from the adapter as seen from the battery attaching portion side; It is a perspective view of the adapter and the battery seen from the positioning part side. It is a perspective view of the adapter and the battery seen from the battery attachment part side. FIG. 4 is a perspective view of the motor housing and the adapter during attachment and detachment, viewed from the inside; FIG. 4 is a perspective view of the motor housing and the adapter during attachment and detachment, viewed from the outside; Fig. 3 is a perspective view of the motor housing and adapter viewed from the inside; Fig. 3 is a perspective view of the motor housing and adapter seen from the outside; Fig. 10 is a right side view of the right portion of the handle with the motor housing and adapter attached; Fig. 3 is a left side view of the right portion of the handle with the motor housing and adapter attached; Fig. 10 is a right side view of the handle with the motor housing, adapter and fixed cover attached; FIG. 31 is a perspective view of FIG. 30 viewed from the longitudinal direction of the motor housing; FIG. 32 is a cross-sectional view taken along line XXXII-XXXII of FIG. 31; Fig. 10 is a right side view of the cutting machine with the second adapter attached; Fig. 10 is a right side view of the handle with the motor housing, second adapter and fixed cover attached; It is a perspective view of a base and an angle fine adjustment mechanism. It is a perspective view of a base and an angle fine adjustment mechanism. FIG. 13 is a partially enlarged view of XIII in FIG. 12, in which the fine angle adjustment mechanism is disassembled; FIG. 11 is a perspective view of a cutting machine according to a second embodiment, excluding a cutting machine main body; FIG. 10 is a perspective view of a cutting machine according to a second embodiment, excluding a cutting machine main body and a turntable; Figure 40 is a plan view of Figure 39; FIG. 41 is a cross-sectional view taken along line XLI-XLI of FIG. 40 with the turntable attached; FIG. 42 is an enlarged view of XLII part of FIG. 41 of the cutting machine according to the third embodiment; FIG. 42 is an enlarged view of XLII part of FIG. 41 of the cutting machine according to the fourth embodiment; FIG. 42 is an enlarged view of XLII part of FIG. 41 of the cutting machine according to the fifth embodiment; FIG. 11 is an overall perspective view of a cutting machine according to a sixth embodiment; FIG. 12 is an enlarged perspective view of the inside of the turntable of the cutting machine according to the sixth embodiment; FIG. 11 is an exploded perspective view of an angle fine adjustment mechanism according to a sixth embodiment; FIG. 11 is a perspective view of the fine angle adjustment mechanism and the rack when the clutch mechanism is not operating; FIG. 11 is a perspective view of the fine angle adjustment mechanism and the rack when the clutch mechanism is actuated;

[First embodiment]
One embodiment of the present invention will be described with reference to FIGS. 1-37. In this embodiment, a cutting machine (desktop cutting machine) 1 called a slide circular saw is exemplified. As shown in FIG. 1 , the cutting machine 1 has a cutting machine body 10 , a turntable 50 for placing a material to be cut, and a base 2 . The base 2 is placed on a desk, floor, or the like, and supports the turntable 50 so as to be horizontally rotatable. The base 2 has auxiliary tables 3 with the same top surface height as the turntable 50 on both left and right sides of the turntable 50 . In the following description, the up, down, left, and right directions of members and configurations are defined based on the user. Regarding the front-rear direction of members and configurations, the front side is the front side when viewed from the user.

As shown in FIGS. 10 and 11, the turntable 50 is horizontally rotatably supported with respect to the base 2 via a rotation support shaft 2a at the center of the upper surface of the base 2. As shown in FIGS. As shown in FIGS. 2 and 8, the turntable 50 has a table body 51 , a table outer peripheral wall 52 and a table extension portion 53 . The table main body 51 has a substantially circular shape in a plan view and has a horizontal upper surface. The table outer peripheral wall 52 is substantially cylindrical and provided on the outer edge of the table main body 51 . The table extension 53 extends forward from the table body 51 . As shown in FIG. 1, a cutting edge plate 54 and a positioning fence 56 for positioning the material to be cut in the plane direction are provided on the upper surface of the table body 51 . As shown in FIG. 12, by making a cut with the cutting tool 11 during use, the actual and accurate position of the cutting tool 11 can be indicated. The cutting edge plate 54 is in the form of one piece before making a cut, and has a notch-shaped slot 55 indicating the position of the cutting tool 11 .

As shown in FIG. 12, a table positioning mechanism 60 (first positioning mechanism) and a positive lock mechanism 65 (second positioning mechanism) are provided below the table extension 53 . A table positioning mechanism 60 has a fixed rod 62 and a grip 61 . The fixed rod 62 extends in the longitudinal direction of the table extension 53 and is arranged inside the table extension 53 . A grip 61 protrudes further forward from the front end of the table extension 53 . A grip 61 is provided integrally with the front end of the fixed rod 62 .

As shown in FIGS. 12 and 13, the rear end of the fixed rod 62 is provided with a threaded shaft portion 62a. The threaded shaft portion 62 a is screwed into a threaded hole 53 a formed in the table extension portion 53 . The screw hole 53a is opened in the front-rear direction in the rear support portion 53c below the rear portion of the table extension portion 53. As shown in FIG. Therefore, the user grips the grip 61 and rotates it around the axis of the fixed rod 62 in the screw tightening direction. Thereby, the fixed rod 62 approaches the base 2 along the longitudinal direction of the table extension 53 . A user grips the grip 61 and rotates it around the axis of the fixed rod 62 in the unscrewing direction. Thereby, the fixed rod 62 is separated from the base 2 along the longitudinal direction of the table extension 53 .

As shown in FIGS. 12 and 13, a protective plate 63 is provided behind the rear end of the fixed rod 62 so as to extend vertically and horizontally. The protection plate 63 is interposed between the distal end of the fixed rod 62 and the front wall of the base 2 (not shown). The protection plate 63 is fixed to the base end of the table extension 53 . By rotating the grip 61 in the screw tightening direction, the rear end of the fixed rod 62 abuts against the protective plate 63 . The protection plate 63 is pressed against the front wall of the base 2 by being pushed by the rear end of the fixed rod 62 . As a result, the table extension 53 is fixed with respect to the base 2 and the turntable 50 cannot rotate with respect to the base 2 . Thus, the turntable 50 is locked with respect to the base 2 at a predetermined rotation angle.

As shown in FIG. 12, the positive lock mechanism 65 has an unlocking lever 66 and a positioning pin 67. As shown in FIG. The unlocking lever 66 is arranged at the front end of the table extension 53 . The lock release lever 66 has an approximately S-shaped (crank-shaped) bent shape, and has an operating portion 66c shaped to protrude forward from the upper center. The operating portion 66c protrudes further forward from the front end of the table extension portion 53 . A rear end portion 66a of the lock release lever 66 shown in FIG. 16 is supported by the table extension portion 53 via a swing shaft portion 66d shown in FIG. 12 so as to be capable of swinging up and down.

As shown in FIGS. 12 and 16, the positioning pin 67 is provided below the fixed rod 62 so as to extend in the front-rear direction. The lock release lever 66 is linked with the positioning pin 67 via the engagement pin 68 on the front side of the swing shaft portion 66d. The engagement pin 68 is a pin with a diameter sufficiently smaller than that of the positioning pin 67 . The engaging pin 68 passes through the positioning pin 67 in the left-right direction. The engaging pin 68 contacts the rear end portion 66a from below. The positioning pin 67 is supported so as to be displaceable forward and backward through the front side support portion 53b and the rear side support portion 53c of the table extension portion 53. As shown in FIG.

When the positioning pin 67 is displaced rearward as shown in FIG. 14, the rear end portion 66a is pressed upward by the engaging pin 68. As a result, the lock release lever 66 swings upward around the swing shaft portion 66d. As shown in FIG. 12, when the lock release lever 66 is swung downward around the swing shaft portion 66d, the engaging pin 68 is pressed downward by the rear end portion 66a. As a result, the engaging pin 68 is relatively displaced forward along the lower surface of the rear end portion 66a. Accordingly, the positioning pin 67 is displaced forward. A rear end portion 67 a of the positioning pin 67 faces the front surface of the miter scale plate 58 attached to the upper surface of the central arc portion of the base 2 . The miter scale plate 58 has a positioning recess 58b on the front surface thereof at a height facing the rear end 67a into which the rear end 67a is inserted. The miter scale plate 58 extends circumferentially in an arc shape, and a plurality of positioning recesses 58b are formed in the miter scale plate 58 circumferentially at predetermined angular intervals.

As shown in FIGS. 12 and 17, a compression spring 66b is attached to the positioning pin 67 in front of the engagement pin 68. As shown in FIG. A compression spring 66b biases the positioning pin 67 rearward. Therefore, the unlocking lever 66 is urged upward via the engagement pin 68 by the compression spring 66b. As shown in FIG. 12, when the lock release lever 66 is positioned at the upper locked position, the positioning pin 67 is displaced rearward by the biasing force of the compression spring 66b. As the positioning pin 67 is displaced rearward, the rear end portion 67a of the positioning pin 67 enters one of the positioning recesses 58b. Thereby, the rotational position of the turntable 50 is locked. The locking position of the positioning pin 67 is held by the biasing force of the compression spring 66b.

As shown in FIG. 14, the operating portion 66c is pushed downward (to the unlock position side) against the biasing force of the compression spring 66b. As a result, the engaging pin 68 is displaced forward, and thus the positioning pin 67 is displaced forward. When the positioning pin 67 is displaced forward, the rear end 67a is extracted from the positioning recess 58b. As a result, the positive lock mechanism 65 is unlocked and the turntable 50 becomes rotatable. When the turntable 50 is rotated while the positive lock mechanism 65 is in the unlocked state, the rear end portion 67a is pressed against the miter scale plate 58 by being biased by the compression spring 66b. When the turntable 50 is rotated to a predetermined angle, the rear end 67a faces one of the plurality of positioning recesses 58b and is automatically inserted into the positioning recesses 58b. Thereby, the rotational position of the turntable 50 is locked at a predetermined angle.

As shown in FIG. 2 , an operation knob 69 is provided on the left side of the front end of the table extension 53 to hold the lock release lever 66 in the depressed position (unlocked position). The push-down operation (unlock operation) of the lock release lever 66 is locked by operating the operation knob 69 . As shown in FIG. 17, the locking of the push-down operation of the lock release lever 66 is achieved by the leaf spring 69a provided integrally with the operation knob 69 interfering behind the operation portion 66c. By holding the unlocking lever 66 at the unlocked position, the rear end 67a shown in FIG. 12 is kept separated from the positioning recess 58b. As a result, the positioning operation by the table positioning mechanism 60 can be performed quickly and reliably. When positioning by the table positioning mechanism 60 is not to be performed, the lock operation of the operation knob 69 is released to release the locked state of the unlock lever 66 . As a result, the lock release lever 66 is returned to the upper lock position by the biasing force of the compression spring 66b.

As shown in FIGS. 5 and 7, the arc-shaped miter scale plate 58 already described is attached to the front portion of the base 2 . The miter scale plate 58 is provided on the front portion of the base 2 in a substantially half circumference area. The miter scale plate 58 has a substantially flat top surface, and a scale indicating the miter angle of the turntable 50 is engraved on the top surface. The miter scale plate 58 is fixed to the base 2 by fixing screws 58a. The hole into which the fixing screw 58a is inserted is an elongated hole, and the angle between the positioning fence 56 and the cutting tool 11 can be finely adjusted by loosening the fixing screw 58a and moving the miter scale plate 58 left and right. For example, if the positioning pin 67 is inserted into the positioning concave portion 58b at the right angle position, the right angle between the cutting tool 11 and the positioning fence 56 can be precisely adjusted. This adjustment is mainly made during the production process of the product.

As shown in FIG. 2, the lower end of the table extension 53 is provided with an adjust bolt 57 that supports the table extension 53 from below. The adjust bolt 57 is supported by the table extension 53 so as to be vertically movable, and is vertically moved by screwing. When the adjusting bolt 57 is operated in the unscrew direction, the adjusting bolt 57 moves downward. The lower end of the adjusting bolt 57 abuts on the mounting surface of the cutting machine 1, so that the adjusting bolt 57 supports the table extension 53 in a height-adjustable manner.

As shown in FIGS. 4 and 12, the positioning fence 56 has a wall shape extending in the horizontal direction and upward. A main body support portion 70 is provided at the rear portion of the turntable 50, and the cutting machine main body 10 is supported by the main body support portion 70 so as to be able to swing. The main body support portion 70 has a left/right tilt support shaft 70a extending in the front-rear direction at the rear portion of the turntable 50 . As shown in FIGS. 6 and 7, the cutting machine main body 10 can be tilted left and right around a horizontal tilt support shaft 70a. A slide bar 71 is provided between the main body support portion 70 and the cutting machine main body 10 . As shown in FIGS. 5 and 8, the cutting machine main body 10 can be slid forward and backward along the slide bar 71 .

As shown in FIG. 2, the rear portion of the cutting machine body 10 is provided with a vertical swing support shaft 10a that is elongated in the left-right direction. The cutting machine main body 10 can swing up and down around a vertical swing support shaft 10a. By swinging the cutting machine body 10 downward, the cutting tool 11 cuts the material placed on the turntable 50 . Subsequently, the cutting machine main body 10 is slid forward. Thereby, the material to be cut can be cut by the cutting tool 11, and for example, a wide material to be cut can be cut.

As shown in FIG. 2, the cutting machine main body 10 has a fixed cover 12 and a movable cover 13 . A fixed cover (cutting tool cover) 12 covers the upper half circumference of the cutting tool 11 . The fixed cover 12 is made of a metal material such as aluminum. The movable cover 13 covers the lower half circumference of the cutting tool 11 . The movable cover 13 rotates in conjunction with the vertical movement of the cutting machine body 10 to open and close the lower half circumference of the cutting tool 11 . During cutting, the movable cover 13 moves to the open position, and the exposed cutting tool 11 cuts the material to be cut.

As shown in FIGS. 3 and 4, the cutter body 10 includes a motor housing 20 and a handle 45. As shown in FIG. The handle 45 has a split structure that can be divided into a right handle portion 46 and a left handle portion 47 that are symmetrical in the left-right direction. The handle 45 has a front main handle 45a and a rear carrying handle 45d. Both the main handle 45a and the carrying handle 45d have a loop shape so that they can be gripped by the user. The main handle 45a is gripped by the user when performing a cutting operation. A switch lever 45c is provided on the inner peripheral edge of the main handle 45a. The switch lever 45c is located at a position where the user can pull it with a finger while gripping the main handle 45a. When the switch lever 45c is pulled, the motor 25 is activated and the cutting tool 11 is rotated.

As shown in FIGS. 3 and 4, a lock-off button 45b is provided on the upper portion of the main handle 45a. The operation of the switch lever 45c is permitted by pressing the lock-off button 45b. This avoids unintentional starting of the motor 25 .

As shown in FIG. 3, the carrying handle 45d is gripped when the user carries the cutting machine 1. As shown in FIG. When the cutter main body 10 is positioned at the lower end position, the carrying handle 45d assumes a posture extending substantially horizontally. The cutting machine 1 can be carried by gripping the carrying handle 45d while the cutting machine main body 10 is locked at the lower end position.

As shown in FIG. 3, the handle 45 has switches 45e and 45f. By pressing the switch 45e, the laser beam of the laser irradiator 49 for black line alignment can be switched on and off. The laser beam is applied to the cut surface and serves as a mark when the cutting tool 11 is moved. By pressing the switch 45f, the illumination light of the lighting device 48 can be switched on and off. The irradiation light brightens the periphery of the cutting area by the cutting tool 11 . The illuminator 48 has an arm extending from the handle 45 and is positioned above the cutter body 10 .

As shown in FIG. 2, the handle 45 has the communication adapter 41 attached to the rear of the carrying handle 45d. Communication adapter 41 is electrically connected to controller 35 shown in FIG. The communication adapter 41 wirelessly communicates with other incidental equipment. Ancillary equipment is, for example, a dust collector for sucking chips. By wireless communication, the start-up operation and stop operation of the incidental equipment are interlocked with the start-up operation and stop operation of the cutting machine 1 .

As shown in FIG. 4 , the motor housing 20 has a substantially cylindrical shape and is inclined upward and to the right with respect to the fixed cover 12 . An intake port 20 a is provided in the upper right portion of the motor housing 20 . As shown in FIG. 32, the motor housing 20 accommodates the motor 25 . The motor 25 is housed in the substantially cylindrical motor housing 20 so that the motor shaft 25a extends along the longitudinal direction. A motor fan 26 is attached to the lower left side of the motor shaft 25a in the direction opposite to the intake port 20a. When the motor 25 starts and the motor fan 26 rotates, outside air is introduced into the motor housing 20 through the intake port 20a.

As shown in FIG. 32, the motor 25 is, for example, a DC brushless motor. A stator 25 b of the motor 25 is non-rotatably supported on the inner peripheral surface of the motor housing 20 . The rotor 25c of the motor 25 is located inside the stator 25b. The rotor 25c is attached to the motor shaft 25a and supported rotatably with respect to the motor housing 20 together with the motor shaft 25a. The rotation angle of the rotor 25c is detected by the sensor substrate 25d.

As shown in FIG. 4, the motor housing 20 is arranged in a position that is not parallel to the upper surface of the turntable 50 but inclined to the upper surface of the turntable 50 in a state where the cutting tool 11 is positioned at a right angle cutting position perpendicular to the upper surface of the turntable 50. be done. Therefore, the angle (bevel angle) at which the cutting machine main body 10 is inclined can be set larger to the right where the motor housing 20 is formed. For example, compared to a configuration in which the motor housing 20 is arranged parallel to the upper surface of the turntable 50, the cutting machine main body 10 can be tilted more to the right.

As shown in FIG. 2, the cutting tool 11 is attached to a spindle (not shown) by tightening a fixing screw 14 with its center sandwiched between an outer flange 15 and an inner flange (not shown). Thereby, the cutting tool 11 is supported by the fixed cover 12 so as to be rotatable integrally with the spindle. The spindle to which the cutting tool 11 is attached rotates as the rotation of the motor shaft 25a shown in FIG. 32 is transmitted through the reduction gear portion.

An adapter 30 can be attached to the rear of the motor housing 20 as shown in FIG. As shown in FIGS. 18 and 19, the adapter 30 is generally box-shaped with steps. The adapter 30 has a positioning portion 31 and a battery attachment portion (first battery attachment portion) 32 at opposite positions. The positioning portion 31 is attached to the motor housing 20 . A battery 40 is detachably attached to the battery attachment portion 32 .

As shown in FIGS. 18 and 19, the positioning portion 31 has a rail 31a, a locking portion 31b and a plane portion 31c. The flat portion 31c is substantially flat, and the rail 31a has a T-shaped cross section and has an upright portion 31d and an overhanging portion 31e. The standing portion 31d protrudes from the flat portion 31c, and the protruding portion 31e protrudes from the tip of the standing portion 31d substantially parallel to the flat portion 31c. The locking portion 31b is positioned at the end of the rail 31a and protrudes from the plane portion 31c. The locking portion 31b extends in a direction substantially orthogonal to the longitudinal direction of the rail 31a.

As shown in FIGS. 18 and 19, the adapter 30 has a first surface 30c having a positioning portion 31 and a second surface 30d having a battery attachment portion 32. As shown in FIGS. The first surface 30c faces the second surface 30d and is substantially parallel to the second surface 30d. The adapter 30 has a body engaging surface 30e and a bottom surface 30f that are substantially orthogonal to the first surface 30c and the second surface 30d. The main body engaging surface 30e is a longitudinal end face of the adapter 30, and is arranged on the cutting machine main body 10 side when attached to the cutting machine main body 10. As shown in FIG. The main body engaging surface 30e is on the upper left when the cutting machine main body 10 is installed. The bottom surface 30f is a longitudinal end face of the adapter 30, and is arranged on the cutting machine main body 10 side when attached to the cutting machine main body 10. As shown in FIG. The bottom surface 30f is located at the lower left when the cutting machine main body 10 is installed.

As shown in FIG. 18 , the positioning portion 31 has a ventilation portion (second ventilation portion) 33 . The ventilation part 33 is formed on a first surface 30c and a bottom surface 30f that are forward when the adapter 30 is attached to the cutting machine main body 10. As shown in FIG. The ventilation part 33 has a second ventilation hole 33a that communicates the inside and the outside of the adapter 30 . The second ventilation hole 33a is a single angular hole that opens from the first surface 30c to the bottom surface 30f.

As shown in FIG. 19, the battery attachment portion 32 has a pair of rails 32a extending in the longitudinal direction of the adapter 30 and an engaging recess 32b. A pair of rails 32a extend along both edges of the adapter 30 and face each other. The engaging claw 40b of the battery 40 shown in FIG. 22 is engaged with the engaging recess 32b.

As shown in FIG. 18, a main body mounting portion 30a that can be engaged with the cutting machine main body 10 is provided on the main body engaging surface 30e. The main body attachment portion 30a is formed as a convex portion protruding in a substantially triangular prism shape. A screw hole 30b is formed in the body mounting portion 30a. As shown in FIG. 29, the screw hole 30b is formed so as to face horizontally when the adapter 30 is attached to the right handle portion 46. As shown in FIG.

Adapter 30 accommodates terminal 38 and controller 35 as shown in FIGS. The lead wires 34 extend from the terminals 38 to the motor 25 and the like via the controller 35 and are electrically connected. The terminal 38 has positive and negative power supply terminals 38b and 38c and a signal terminal 38d, and has a terminal base portion 38a in which the three terminals are molded with resin. The controller 35 has a shallow rectangular parallelepiped case and a control board housed in the case and molded with resin. The controller 35 is arranged in the adapter 30 with its longitudinal direction aligned with the longitudinal direction of the adapter 30 .

As shown in FIG. 32, the controller 35 mainly has a control circuit for controlling the operation of the motor 25 and a power supply circuit. The controller 35 is equipped with a control circuit, a drive circuit, an auto-stop circuit, and the like. The control circuit has a microcomputer that transmits a control signal based on the positional information of the rotor 25c detected by the sensor substrate 25d. The drive circuit has FETs that switch the current of the motor 25 based on control signals received from the control circuit. The auto-stop circuit cuts off the power supply to the motor 25 according to the detection result of the state of the battery 40 so as not to cause an over-discharge or over-current state.

As shown in FIGS. 20 to 23, the battery 40 is a box-shaped lithium-ion battery with an output voltage of 18V, for example. The battery 40 is rechargeable, and can be detached from the battery mounting portion 32 and charged with a separately prepared charger. The battery 40 can be reused as a power source between other rechargeable power tools such as a screwdriver and an electric drill.

As shown in FIGS. 20-23, the battery 40 has a pair of rails 40c and connection terminals 40d. The pair of rails 40 c extends parallel to each other along the longitudinal direction of the battery 40 . When attaching/detaching the battery 40 to/from the battery mounting portion 32, the pair of rails 40c of the battery 40 is slid along the pair of rails 32a of the battery mounting portion 32 in the directions indicated by the white arrows in the drawing. The connection terminal 40d is positioned between the pair of rails 40c. When the battery 40 is attached to the battery attachment portion 32, the connection terminal 40d is electrically connected to the positive and negative power supply terminals 38b, 38c and the signal terminal 38d of the battery attachment portion 32 shown in FIG. Thereby, the battery 40 is electrically connected to the controller 35 and the terminal 38, and is electrically connected to the motor 25 and the like through these.

As shown in FIGS. 20-23, the battery 40 has an engagement release button 40a and an engagement claw 40b. The engaging claw 40b protrudes toward the battery mounting portion 32 and is biased in the protruding direction by a biasing member (not shown). The disengagement button 40 a is provided on the side of the battery 40 . By pushing the engagement release button 40a, the engagement claw 40b is retracted inside the battery 40 against the biasing force of the biasing member. Therefore, when the battery 40 is attached to the battery attachment portion 32, the engaging claw 40b is automatically engaged with the engaging recess 32b by the biasing force of the biasing member. The battery 40 is thereby held in the battery mounting portion 32 . The engagement release button 40a is pushed while the engagement claw 40b and the engagement recess 32b are engaged. As a result, the engaging claw 40b is disengaged from the engaging recess 32b, and the battery 40 can be removed from the battery mounting portion 32. As shown in FIG.

As shown in FIGS. 24 and 25 , a positioning portion 22 for positioning the adapter 30 with respect to the motor housing 20 is provided behind the motor housing 20 . The positioning portion 22 has a pair of left and right rails 22 a and a shielding portion (first ventilation portion) 21 . The pair of rails 22 a extends parallel to the axial direction of the substantially cylindrical motor housing 20 . The shielding portion 21 is positioned so as to be lower left when the motor housing 20 is attached to the right handle portion 46 as shown in FIG.

As shown in FIG. 25 , shielding portion 21 has a substantially box-like shape projecting rearward from positioning portion 22 . By sliding the adapter 30 onto the motor housing 20 using the rails 22a, the shielding portion 21 is fitted into the second ventilation holes 33a. The fitting setting between the upright portion 31d of the adapter 30 and the pair of rails 22a of the motor housing 20 is not a press fit with a tight fit, but a loose fit with a slight clearance. Such setting enables quick manual assembly. As shown in FIG. 24 , the shielding portion 21 has a substantially rectangular first ventilation hole 21 a that communicates the inside and outside of the motor housing 20 . As shown in FIG. 32 , the first ventilation hole 21 a is positioned on a radial extension line of the motor fan 26 and opens toward the motor fan 26 .

As shown in FIGS. 24 and 26, the side surface 20d of the motor housing 20 is located on the left side when the motor housing 20 is attached to the cutting machine body 10. As shown in FIGS. A protrusion 20b protruding in a substantially triangular prism shape is provided on the side surface 20d. A threaded hole 20c is formed in the projection 20b. As shown in FIG. 29, the screw hole 20c is formed so as to face the horizontal direction when the motor housing 20 is attached to the right handle portion 46. As shown in FIG.

As shown in FIGS. 24 to 27, the rail 31a of the adapter 30 is slid along the rail 22a of the motor housing 20 in the direction of the white arrow in the drawing. As a result, the adapter 30 is attached to and detached from the positioning portion 22 along the longitudinal direction of the motor housing 20 . When the adapter 30 is attached to the positioning portion 22 and arranged side by side with the motor housing 20 , the shielding portion 21 fits into the notch portion 33 b at the entrance of the ventilation portion 33 . As a result, the first ventilation hole 21a communicates with the second ventilation hole 33a. The adapter 30 is positioned with respect to the motor housing 20 by fitting the shielding portion 21 and the notch portion 33b.

As indicated by arrows in FIG. 32, the motor cooling air is introduced into the motor housing 20 through the air inlet 20a by the rotation of the motor fan 26. As shown in FIG. Subsequently, the motor cooling air flows toward the motor fan 26 along the motor shaft 25a. The motor fan 26 sends motor cooling air in the radial direction. The motor cooling air enters the adapter 30 through the first ventilation hole 21a and the second ventilation hole 33a. Thereby, the motor cooling air cools the controller 35 and the terminal 38 housed in the adapter 30 . After that, the cooling air branches and is discharged from the right exhaust air window 36 and the left exhaust air window 37 .

As shown in FIGS. 28 and 29, motor housing 20 and adapter 30 are attachable to right handle portion 46 . The handle right portion 46 has fitting holes 46a and 46b. The fitting hole 46 a is provided in a substantially rectangular shape with the longitudinal direction being the longitudinal direction, and can be fitted with the convex portion 20 b of the motor housing 20 . The fitting hole 46 b is provided in a substantially rectangular shape whose longitudinal direction is the front-rear direction, and can be fitted with the body attachment portion 30 a of the adapter 30 . When assembling the motor housing 20 and the adapter 30 to the right handle portion 46, the convex portion 20b of the motor housing 20 is fitted into the fitting hole 46a, and the body mounting portion 30a of the adapter 30 is fitted into the fitting hole 46b. . This positions the motor housing 20 and the adapter 30 on the right handle portion 46 .

As shown in FIGS. 28 and 29, the convex portion 20b is inserted into the fitting hole 46a of the right handle portion 46, and the body mounting portion 30a of the adapter 30 is inserted into the fitting hole 46b of the right handle portion 46. , the handle left portion 47 and the handle right portion 46 are overlapped so as to match the shape. After that, the motor housing/right handle/left handle fastening screw 20e (not shown) is tightened into the screw hole 20c of the projection 20b, and the adapter/right handle/left handle is screwed into the screw hole 30b of the body mounting portion 30a. By tightening the part fastening screw 30g, the four parts of the motor housing 20, the adapter 30, the right handle part 46 and the left handle part 47 are integrated. The screw holes 20c and 30b are substantially parallel when the motor housing 20 and the adapter 30 are assembled. Therefore, the two screws attached to the screw holes 20c and 30b are parallel to each other. With the configuration as described above, the four parts can be quickly integrated.

Furthermore, the integrated four parts can be attached to the fixed cover 12 by screwing. As shown in FIGS. 28, 29 and 31, the four motor housing/fixing cover fastening screws 12b-e are first passed through the four corner insertion holes 20g-j of the motor housing 20 which are opened parallel to the motor 25. and tighten it to the fixed cover 12. After that, the right handle portion/fixed cover fastening screw 12f is passed through the insertion hole 46c of the right handle portion 46 opened perpendicular to the cutting tool 11 and attached to the fixed cover 12 .

As shown in FIGS. 33 and 34 , the positioning portion 22 of the motor housing 20 can be fitted with an adapter (second adapter) 101 instead of the adapter (first adapter) 30 . The adapter 101 has a positioning portion 102 that can be attached to the positioning portion 22 and has a structure similar to that of the positioning portion 31 .

As shown in FIGS. 33 and 34, the adapter 101 has a battery mounting portion 103 instead of the battery mounting portion 32 of the adapter 30. FIG. A rail 103 a extending in the longitudinal direction of the adapter 101 is provided on the battery mounting portion (second battery mounting portion) 103 . A battery (second battery) 105 having a shape different from that of the battery (first battery) 40 can be detachably attached to the battery attachment portion 103 . The battery 105 is a box-shaped lithium ion battery with an output voltage of 36V, for example. The battery 105 is rechargeable, and can be detached from the battery mounting portion 103 and charged with a separately prepared charger.

As shown in FIG. 1, the cutting machine 1 has a base 2 and a turntable 50 rotatably supported by the base 2 . Furthermore, the cutting machine 1 has an angle fine adjustment mechanism 80 for adjusting the rotation angle of the turntable 50 with respect to the base 2, as shown in FIGS.

As shown in FIGS. 35 and 36, the angle fine adjustment mechanism 80 is provided in the rear region of the base 2 and the turntable 50. As shown in FIGS. The angle fine adjustment mechanism 80 has an operation portion 81 , a reduction shaft 85 and a rack 86 . A rack 86 is provided along the inner wall portion 2 e of the base 2 . The inner wall portion 2e is located on the inner peripheral side closer to the rotary support shaft 2a than the table outer peripheral wall 52 of the turntable 50. As shown in FIG. The inner wall portion 2e extends vertically (perpendicularly) toward the rotation support shaft 2a. The inner wall portion 2e has an arc shape in a plan view centering on the rotation support shaft 2a. In the drawings of the present application, all the teeth of the rack and pinion are omitted.

As shown in FIGS. 35 and 36, the rack 86 has an arc-shaped rack body 86a with the rotary support shaft 2a as the arc center axis 86b, and a plurality of teeth 86c formed on the rack body 86a. The plurality of teeth 86c are arranged at predetermined intervals in the circumferential direction on the inner peripheral surface of the rack body 86a. The teeth 86c protrude radially toward the center from the rack body 86a. A tooth space is formed between the teeth 86c. The tooth 86c extends vertically (vertically).

As shown in FIGS. 12 and 35 to 37, the operating portion 81 is provided at the upper end of the rotary shaft 82, and the first pinion 83 is provided at the lower end of the rotary shaft 82. As shown in FIGS. The operation unit 81 is positioned above the upper surface of the turntable 50 and can be operated by the user. The operation part 81 is located behind the positioning fence 56 and located on the inner peripheral side of the table outer peripheral wall 52 of the turntable 50 closer to the rotation support shaft 2a. The operating portion 81 and the rotating shaft 82 are integrally provided. The rotating shaft 82 is supported by the turntable 50 so as to be rotatable about its axis. A first pinion 83 is provided coaxially with the rotating shaft 82 below the rotating shaft 82 . The tooth spaces of the first pinion 83 extend vertically. When the operating portion 81 is rotated around the rotating shaft 82, the operating portion 81, the rotating shaft 82, and the first pinion 83 rotate together.

As shown in FIGS. 12 and 37, a compression spring 84 is provided between the lower end of the operating portion 81 and the upper surface of the turntable 50 to bias the operating portion 81 upward. When the operating portion 81 is urged upward, the rotating shaft 82 and the first pinion 83 are also urged upward. As a result, the first pinion 83 moves to the release position where the reduction shaft 85 is disengaged from the pinion engagement gear 85a. At the release position, the first pinion 83 is disengaged from the rack 86 via the pinion engaging gear 85a and the second pinion 85b. When the operating portion 81 is moved downward against the biasing force, the rotation shaft 82 and the first pinion 83 are also moved downward. As a result, the first pinion 83 moves to the engagement position where it engages with the pinion engagement gear 85a of the speed reduction shaft 85 . At the engaged position, the first pinion 83 indirectly engages the rack 86 via the pinion engaging gear 85a and the second pinion 85b.

As shown in FIGS. 12 and 35 to 37, the reduction shaft (reduction mechanism) 85 is non-rotatably supported by the turntable 50 by press fitting. The deceleration shaft 85 extends vertically and is arranged in parallel with the rotation shaft 82 to which the first pinion 83 is attached. A second pinion 85 b that is coaxial with the speed reduction shaft 85 is loosely inserted into the lower portion of the speed reduction shaft 85 so that the second pinion 85 b is rotatable with respect to the speed reduction shaft 85 . The second pinion 85b engages with the rack 86. As shown in FIG. A pinion engagement gear 85a coaxial with the reduction shaft 85 is provided above the second pinion 85b. The pinion engaging gear 85a releasably engages with the first pinion 83 . That is, the speed reduction shaft 85 is interposed between the first pinion 83 and the rack 86 .

As shown in FIGS. 35 and 36 , the operating portion 81 is rotated while being pushed downward against the biasing force of the compression spring 84 . As a result, the first pinion 83 is engaged with the pinion engagement gear 85a. The rotational speed of the operating portion 81 is transmitted while being reduced by the engagement between the first pinion 83 and the pinion engagement gear 85a. The rotation speed of the pinion engagement gear 85a is reduced by the engagement of the second pinion 85b with the rack 86 and transmitted. The rotation of the first pinion 83 causes the first pinion 83 to relatively move along the rack 86 . As a result, the turntable 50 rotates with respect to the base 2 around the rotary support shaft 2a. Thus, the rotational position of the turntable 50 can be finely adjusted.

When the turntable 50 reaches a desired angle with respect to the base 2 , the user releases the force applied to the operating portion 81 . As a result, the operating portion 81 is moved upward by the biasing force of the compression spring 84, and the first pinion 83 is automatically moved upward to the release position. As a result, the turntable 50 does not rotate with respect to the base 2 even if the operating portion 81 is unexpectedly rotated.

As shown in FIGS. 1, 12 and 35, the cutting machine 1 has a base 2, a turntable 50 and a cutting machine body 10. As shown in FIGS. The turntable 50 is rotatably provided on the horizontal plane with respect to the base 2 . The cutting machine main body 10 is positioned above the turntable 50 and is connected to the turntable 50 so as to be vertically swingable. The turntable 50 has a substantially disc-shaped table body 51 on which a material to be cut is placed, and a table extension portion 53 projecting forward from the table body 51 . The cutting machine 1 has an angle fine adjustment mechanism 80 that precisely adjusts a slight rotation angle of the turntable 50 with respect to the base 2 with good operability. The angle fine adjustment mechanism 80 has a rack 86 provided on the base 2 , a first pinion 83 and an operating portion 81 . The first pinion 83 is provided on the table main body 51 so as to be positioned within the area of the table main body 51 when viewed from above, and is indirectly engaged with the rack 86 . The operating portion 81 is gripped by a user to rotate the first pinion 83 .

Therefore, the first pinion 83 is located inside the table main body 51 , that is, near the rotation support shaft 2 a that is the center of rotation of the turntable 50 . Therefore, the operating portion 81 that rotates the first pinion 83 is also located near the rotary support shaft 2a. Therefore, the distance over which the operating portion 81 moves along with the rotation of the turntable 50 is relatively short and is located within a narrow area. This makes it easy to operate the operation unit 81 . The rack 86 is provided on the inner wall portion 2 e of the base 2 . The base 2 is less deformed over time than the turntable 50 which is distorted by placing the material to be cut thereon. Therefore, the rack 86 has higher durability than the rack provided on the turntable 50 .

As shown in FIG. 35, the first pinion 83 and the operating portion 81 of the angle fine adjustment mechanism 80 are integrally formed via a rotating shaft 82 so as to rotate together. The pinion engaging gear 85a and the second pinion 85b of the angle fine adjustment mechanism 80 are integrally formed via a reduction shaft 85 so as to rotate integrally. The first pinion 83 moved to the engagement position meshes with the pinion engagement gear 85a. The second pinion 85b meshes with the rack 86. As shown in FIG.

Therefore, the operation portion 81 is rotated while the first pinion 83 is moved to the engagement position. As a result, the operating force for operating the operating portion 81 is reduced by the engagement between the first pinion 83 and the pinion engaging gear 85a. The rotation speed of the pinion engagement gear 85a is reduced by the engagement of the second pinion 85b with the rack 86 and transmitted. Therefore, the rotational position of the turntable 50 with respect to the base 2 can be finely adjusted. It is also possible to simplify the structure of the angle fine adjustment mechanism 80 . Therefore, the formation cost of the angle fine adjustment mechanism 80 can be suppressed. Also, the first pinion 83 can be operated by the operating portion 81 with a relatively small force.

As shown in FIG. 12, the first pinion 83 is mounted on the table body 51 so as to be movable between an engagement position where the rack 86 is engaged in the extending direction of the rotating shaft 82 and a release position where the engagement position is released. be provided. Therefore, by moving the first pinion 83 from the engagement position to the release position, the turntable 50 can be rotated without operating the angle fine adjustment mechanism 80 . Therefore, the turntable 50 can be largely rotated. On the other hand, when the first pinion 83 is moved to the engagement position, the position of the turntable 50 can be finely adjusted by the angle fine adjustment mechanism 80 . Moreover, since the first pinion 83 moves between engagement positions by linear motion, the transmission of the operating force to the rack 86 can be easily switched on and off.

As shown in FIGS. 12 and 35, the rack 86 has an arcuate rack body 86a and a plurality of teeth 86c projecting radially from the rack body 86a and arranged along the arc. The first pinion 83 is provided on the table main body 51 so that the rotation axis of the first pinion 83 and the circular arc central axis 86b of the rack main body 86a are parallel to each other. Therefore, the rotation axis of the first pinion 83 and the rotation axis of the rack 86 are parallel. Therefore, the transmission efficiency of the operating force from the first pinion 83 to the rack 86 is increased. Thus, the turning motion of the turntable 50 becomes smooth. The tooth spaces of the first pinion 83 and the tooth spaces of the rack 86 are parallel. Therefore, it is easy to move the first pinion 83 in the rotation axis direction, and to easily move it to the engagement position and the release position.

As shown in FIGS. 12 and 37, the cutting machine 1 has a compression spring 84 that biases the first pinion 83 from the engaged position (lower position) toward the released position (upper position). Therefore, when it is not necessary to finely adjust the turntable 50 with the operating portion 81, the first pinion 83 can be automatically moved to the release position.

As shown in FIG. 9 , the first pinion 83 and the operating portion 81 are positioned along the rear peripheral region of the table body 51 . On the other hand, the material to be cut is placed on the front area of the turntable. Therefore, the first pinion 83 and the operating portion 81 are provided at positions that do not interfere with the material to be cut. Therefore, even after the material to be cut is placed on the turntable 50, the user can easily operate the operating portion 81. FIG.

As shown in FIGS. 12 and 35 , a reduction shaft (reduction mechanism) 85 is interposed between the first pinion 83 and the rack 86 to reduce the rotational speed of the first pinion 83 and transmit it to the rack 86 . Therefore, the rotation speed transmitted to the rack 86 is reduced by the speed reduction shaft 85 compared to the rotation speed of the operating portion 81 . Therefore, the miter angle of the turntable 50 with respect to the base 2 can be adjusted more finely. Moreover, the diameter of the rack 86 can be reduced. For example, the diameter of the rack 86 can be reduced by providing the deceleration shaft 85 compared to a structure in which the rotation of the turntable 50 relative to the base 2 is reduced by increasing the diameter of the rack 86 . Thus, both the fine adjustment of the miter angle and the compactness of the desktop cutting machine 1 can be achieved.

[Second embodiment]
The cutting machine may have a base 112, a turntable 113, and an angle fine adjustment mechanism 111 shown in FIGS. 38 to 41 instead of the base 2, turntable 50, and angle fine adjustment mechanism 80 shown in FIGS. .

As shown in FIGS. 38 and 41, the turntable 113 of the cutting machine (desktop cutting machine) 110 has a table body 114 , a table peripheral wall 115 and a table extension 53 . The table body 114 has a substantially circular shape in a plan view and has a horizontal top surface. The outer peripheral wall 115 of the table has a substantially cylindrical shape around the rotation support shaft 112a on the outer edge of the table main body 51. As shown in FIG. The table outer peripheral wall 115 has a front right wall portion 115a on the right side of the table extension portion 53 and a front left wall portion 115b on the left side of the table extension portion 53 in the front half peripheral area.

As shown in FIGS. 39 to 41, the base 112 has a rack support 112b inside the outer peripheral wall 115 of the table. Here, the positioning recess 112c facing the positioning pin 67 is provided directly on the base 112 instead of on the miter scale plate as in the first embodiment. The rack support base 112b has a hollow cylindrical shape centered on the rotary support shaft 112a. The rack support base 112b has a horizontal upper surface, and the rack 118 is fixed to the upper surface. The rack 118 has an arcuate rack body 118a around the rotation support shaft 112a in the front area of the rack support base 112b. Rack 118 is a bevel gear having a plurality of teeth 118b. A plurality of teeth 118b are circumferentially evenly spaced on the upper surface of the rack body 118a and have tooth spaces between the teeth 118b. The teeth 118b and tooth grooves extend radially about the rotary support shaft 112a and are inclined downward as they go radially outward.

As shown in FIGS. 38 to 41, the cutting machine 110 has an angle fine adjustment mechanism 111 (111A, 111B) in front regions of the base 112 and the turntable 113. As shown in FIGS. The right angle fine adjustment mechanism 111A is located on the right side of the table extension 53, and the left angle fine adjustment mechanism 111B is located on the left side of the table extension 53. As shown in FIG. The right angle fine adjustment mechanism 111A has a first operating portion 116, a first pinion 116b and a rack 118. As shown in FIG.

As shown in FIGS. 38 to 40, the first operating portion 116 is positioned substantially at the center in the height direction of the front right wall portion 115a. The first operation portion 116 is positioned in front of the front right wall portion 115a and can be operated by the user. The first operating portion 116 is positioned at the tip of the first pinion shaft 116a and provided integrally with the first pinion shaft 116a. The first pinion shaft 116a extends along a radial line from the rotary support shaft 112a and is arranged horizontally. The first pinion shaft 116a is rotatably supported by the front right wall portion 115a. A first pinion 116b is provided integrally with the proximal end of the rotary support shaft 112a. The first pinion 116b is a conical bevel gear coaxial with the first pinion shaft 116a. The diameter of the first pinion 116b gradually decreases toward the end.

As shown in FIGS. 40 and 41, when the first operating portion 116 is rotated around the first pinion shaft 116a, the first operating portion 116, the first pinion shaft 116a and the first pinion 116b rotate together. The first pinion shaft 116a is supported by the front right wall portion 115a so as to be horizontally movable in the radial direction about the rotation support shaft 112a. When the first operating portion 116 is pushed inward, the first pinion 116b moves to the engaging position where it engages with the rack 118. As shown in FIG. When the first operating portion 116 is pulled outward, the first pinion 116b moves to the release position where the engagement with the rack 118 is released. The first operating portion 116 is positioned inside the outer circumference of the base 112 in top view in both the engaged position and the disengaged position.

As shown in FIGS. 38 to 40, the left angle fine adjustment mechanism 111B has a second operating portion 117, a second pinion 117b and a rack 118. As shown in FIGS. The second operation portion 117 is positioned substantially at the height center of the front left wall portion 115b. The second operation portion 117 is positioned in front of the front left wall portion 115b and can be operated by the user. The second operation portion 117 is positioned at the tip of the second pinion shaft 117a and provided integrally with the second pinion shaft 117a. The second pinion shaft 117a extends along a radial line from the rotary support shaft 112a and is arranged horizontally. The second pinion shaft 117a is supported by the front left wall portion 115b so as to be rotatable about its axis. A second pinion 117b is provided integrally with the proximal end of the rotary support shaft 112a. The second pinion 117b is a conical bevel gear coaxial with the second pinion shaft 117a. The diameter of the second pinion 117b gradually decreases toward the end.

As shown in FIGS. 40 and 41, when the second operating portion 117 is rotated around the second pinion shaft 117a, the second operating portion 117, the second pinion shaft 117a, and the second pinion 117b rotate together. The second pinion shaft 117a is supported by the front left wall portion 115b so as to be horizontally movable in the radial direction about the rotation support shaft 112a. When the second operating portion 117 is pushed inward, the second pinion 117b moves to the engaging position where it engages with the rack 118. As shown in FIG. When the second operating portion 117 is pulled outward, the second pinion 117b moves to the release position where the engagement with the rack 118 is released. The second operating portion 117 is located inside the outer circumference of the base 112 in top view in both the engaged position and the disengaged position.

As shown in FIG. 41, the second operating portion 117 is rotated about its axis while the second pinion 117b is moved to the engaging position. As a result, the second pinion 117b rotates while engaging with the rack 118, and the second pinion 117b moves along the rack 118 in the circumferential direction. As a result, the turntable 113 rotates around the rotary support shaft 112a. Thus, the rotational position of the turntable 113 can be finely adjusted. Note that the first operation section 116 can be operated in the same manner as the second operation section 117 .

[Third embodiment]
The cutting machine 110 may have a base 122 and an angle fine adjustment mechanism 121 shown in FIG. 42 instead of the base 112 and the angle fine adjustment mechanism 111 shown in FIG. The base 122 has a rack support base 122b in a region inside the outer peripheral wall 115 of the table. The rack support base 112b has a substantially circular shape in a plan view centered on the rotary support shaft 112a (see FIG. 40). A rack 128 is fixed to the upper surface of the rack support base 122b. The rack 128 has an arcuate rack body 128a around the rotation support shaft 112a in the front area of the rack support base 122b. Rack 128 is a bevel gear having a plurality of teeth 128b. A plurality of teeth 128b are circumferentially evenly spaced on the lower surface of the rack body 128a and have tooth spaces between the teeth 128b. The teeth 128b and tooth grooves extend radially about the rotary support shaft 112a and are inclined upward as they go radially outward.

As shown in FIG. 42, the cutting machine 110 has an angle fine adjustment mechanism 121 in the front area of the base 122 and the turntable 113 . The left fine angle adjustment mechanism 121B shown in FIG. 42 is located on the left side of the table extension 53, like the fine angle adjustment mechanism 111B shown in FIG. The fine angle adjustment mechanism (not shown) is located on the right side of the table extension 53, like the fine angle adjustment mechanism 111A shown in FIG.

As shown in FIG. 42, the left angle fine adjustment mechanism 121B has a second operating portion 127, a second pinion 127b and a rack 128. As shown in FIG. The second operation portion 127 is positioned substantially at the center in the height direction of the front left wall portion 115b. The second operation portion 127 is positioned in front of the front right wall portion 115a and can be operated by the user. The second operating portion 127 is positioned at the tip of the second pinion shaft 127a and provided integrally with the second pinion shaft 127a. The second pinion shaft 127a extends along a radial line from the rotary support shaft 112a and is arranged horizontally. The second pinion shaft 127a is rotatably supported by the front right wall portion 115a. A second pinion 127b is provided integrally with the proximal end of the rotary support shaft 112a. The second pinion 127b is a conical bevel gear coaxial with the second pinion shaft 127a. The diameter of the second pinion 127b gradually decreases toward the end.

As shown in FIG. 42, when the second operating portion 127 is rotated around the second pinion shaft 127a, the second operating portion 127, the second pinion shaft 127a and the second pinion 127b rotate together. The second pinion shaft 127a is supported by the front left wall portion 115b so as to be horizontally movable in the radial direction about the rotary support shaft 112a (see FIG. 40). When the second operating portion 127 is pushed inward, the second pinion 127b moves to the engagement position where it engages with the rack 128. As shown in FIG. When the second operating portion 127 is pulled outward, the second pinion 127b moves to the release position where the engagement with the rack 128 is released. The second operating portion 127 is located inside the outer circumference of the base 122 in top view in both the engaged position and the released position.

As shown in FIG. 42, the second operating portion 127 is rotated about its axis while the second pinion 127b is moved to the engagement position. As a result, the second pinion 127b rotates while engaging with the rack 128, and the second pinion 127b moves along the rack 128 in the circumferential direction. As a result, the turntable 113 rotates around the rotary support shaft 112a. Thus, the rotational position of the turntable 113 can be finely adjusted. A right angle fine adjustment mechanism (not shown) is formed in the same manner as the left angle fine adjustment mechanism 121B.

[Fourth embodiment]
The cutting machine 110 may have a base 132 and a fine angle adjustment mechanism 131 shown in FIG. 43 instead of the base 112 and fine angle adjustment mechanism 111 shown in FIG. The base 132 has a rack support base 132b in a region inside the outer peripheral wall 115 of the table. The rack support base 132b has a generally circular shape in a plan view centered on the rotary support shaft 112a (see FIG. 40). A rack 138 is fixed to the upper surface of the rack support base 132b. The rack 138 has an arc-shaped rack body 138a around the rotation support shaft 112a in the front area of the rack support base 132b. Rack 138 is a bevel gear having a plurality of teeth 138b. A plurality of teeth 138b are circumferentially evenly spaced on the upper surface of the rack body 138a and have tooth spaces between the teeth 138b. The teeth 138b and tooth grooves extend radially about the rotary support shaft 112a and are inclined upward as they go radially outward.

As shown in FIG. 43, the cutting machine 110 has an angle fine adjustment mechanism 131 in the front area of the base 132 and turntable 113 . The left fine angle adjustment mechanism 131B shown in FIG. 43 is located on the left side of the table extension 53, like the fine angle adjustment mechanism 111B shown in FIG. The fine angle adjustment mechanism (not shown) is located on the right side of the table extension 53, like the fine angle adjustment mechanism 111A shown in FIG.

As shown in FIG. 43, the left angle fine adjustment mechanism 131B has a second operating portion 137, a second pinion 137b and a rack 138. As shown in FIG. The second operation portion 137 is positioned substantially at the center in the height direction of the front left wall portion 115b. The second operation portion 137 is positioned in front of the front right wall portion 115a and can be operated by the user. The second operation portion 137 is positioned at the tip of the second pinion shaft 137a and provided integrally with the second pinion shaft 137a. The second pinion shaft 137a extends along a radial line from the rotary support shaft 112a and is arranged horizontally. The second pinion shaft 137a is rotatably supported by the front right wall portion 115a. A second pinion 137b is provided integrally with the proximal end of the rotary support shaft 112a. The second pinion 137b is a conical bevel gear coaxial with the second pinion shaft 137a. The diameter of the second pinion 137b gradually increases toward the end.

As shown in FIG. 43, when the second operating portion 137 is rotated around the second pinion shaft 137a, the second operating portion 137, the second pinion shaft 137a and the second pinion 137b rotate together. The second pinion shaft 137a is supported by the front left wall portion 115b so as to be horizontally movable in the radial direction around the rotary support shaft 112a (see FIG. 40). When the second operating portion 137 is pulled outward, the second pinion 137b moves to the engagement position where it engages with the rack 138. As shown in FIG. When the second operating portion 137 is pushed inward, the second pinion 137b is disengaged from the rack 138 and moves to the release position. The second operating portion 137 is located inside the outer circumference of the base 132 in top view in both the engaged position and the released position.

As shown in FIG. 43, the second operating portion 137 is rotated about its axis while the second pinion 137b is moved to the engaging position. As a result, the second pinion 137b rotates while engaging with the rack 138, and the second pinion 137b moves along the rack 138 in the circumferential direction. As a result, the turntable 113 rotates around the rotary support shaft 112a. Thus, the rotational position of the turntable 113 can be finely adjusted. A right angle fine adjustment mechanism (not shown) is formed in the same manner as the left angle fine adjustment mechanism 131B.

[Fifth embodiment]
The cutting machine 110 may have a base 142 and an angle fine adjustment mechanism 141 shown in FIG. 44 instead of the base 112 and the angle fine adjustment mechanism 111 shown in FIG. The base 142 has a rack support base 142b in a region inside the outer peripheral wall 115 of the table. The rack support base 142b has a generally circular shape in a plan view centered on the rotary support shaft 112a (see FIG. 40). A rack 148 is fixed to the upper surface of the rack support base 142b. The rack 148 has an arc-shaped rack body 148a around the rotation support shaft 112a in the front area of the rack support base 142b. Rack 148 is a bevel gear having a plurality of teeth 148b. A plurality of teeth 148b are arranged at equal intervals in the circumferential direction on the lower surface of the rack body 148a, and have tooth spaces between the teeth 148b. The teeth 148b and the tooth grooves extend radially about the rotary support shaft 112a and are inclined downward as they go radially outward.

As shown in FIG. 44, the cutting machine 110 has an angle fine adjustment mechanism 141 in the front area of the base 142 and the turntable 113 . The left fine angle adjustment mechanism 141B shown in FIG. 44 is located on the left side of the table extension 53, similar to the fine angle adjustment mechanism 111B shown in FIG. The fine angle adjustment mechanism (not shown) is located on the right side of the table extension 53, like the fine angle adjustment mechanism 111A shown in FIG.

As shown in FIG. 44, the left side angle fine adjustment mechanism 141B has a second operating portion 147, a second pinion 147b and a rack 148. As shown in FIG. The second operation portion 147 is positioned substantially at the center in the height direction of the front left wall portion 115b. The second operation portion 147 is located behind the front right wall portion 115a and can be operated by the user. The second operation portion 147 is positioned at the tip of the second pinion shaft 147a and provided integrally with the second pinion shaft 147a. The second pinion shaft 147a extends along a radial line from the rotary support shaft 112a and is arranged horizontally. The second pinion shaft 147a is rotatably supported by the front right wall portion 115a. A second pinion 147b is provided integrally with the proximal end of the rotary support shaft 112a. The second pinion 147b is a conical bevel gear coaxial with the second pinion shaft 147a. The diameter of the second pinion 147b gradually increases toward the end.

As shown in FIG. 44, when the second operating portion 147 is rotated around the second pinion shaft 147a, the second operating portion 147, the second pinion shaft 147a and the second pinion 147b rotate together. The second pinion shaft 147a is supported by the front left wall portion 115b so as to be horizontally movable in the radial direction around the rotary support shaft 112a (see FIG. 40). When the second operating portion 147 is pulled outward, the second pinion 147b moves to the engagement position where it engages with the rack 148. As shown in FIG. When the second operating portion 147 is pushed inward, the second pinion 147b moves to the release position where the engagement with the rack 148 is released. The second operating portion 147 is located inside the outer circumference of the base 142 in top view in both the engaged position and the released position.

As shown in FIG. 44, the second operating portion 147 is rotated about its axis while the second pinion 147b is moved to the engagement position. As a result, the second pinion 147b rotates while engaging with the rack 148, and the second pinion 147b moves along the rack 148 in the circumferential direction. As a result, the turntable 113 rotates around the rotary support shaft 112a. Thus, the rotational position of the turntable 113 can be finely adjusted. A right angle fine adjustment mechanism (not shown) is formed in the same manner as the left angle fine adjustment mechanism 141B.

The cutting machine 110 has a base 112, a turntable 113 and a cutting machine body 10, as shown in FIGS. The turntable 113 is rotatably provided on a horizontal plane with respect to the base 112 . The cutting machine main body 10 is positioned above the turntable 113 and is connected to the turntable 113 so as to be vertically swingable. The turntable 113 has a substantially disk-shaped table body 114 on which the material to be cut is placed, and a table extension portion 53 projecting forward from the table body 114 . The cutting machine 110 has an angle fine adjustment mechanism 111 that precisely adjusts a slight rotation angle of the turntable 113 with respect to the base 112 with good operability. The angle fine adjustment mechanism 111 has a rack 118 provided on the base 112, pinions (first pinion 116b, second pinion 117b), and operation sections (first operation section 116, second operation section 117). The first pinion 116b and the second pinion 117b are provided on the table main body 114 so as to be positioned within the area of the table main body 114 when viewed from the top, and engage the rack 118 directly or indirectly. The first operation unit 116 is gripped by the user to rotate the first pinion 116b. The second operating portion 117 is gripped by the user to rotate the second pinion 117b.

Therefore, the first pinion 116b and the second pinion 117b are located inside the table body 114, that is, near the rotation support shaft 112a, which is the rotation center of the turntable 113. As shown in FIG. Therefore, the first operating portion 116 that rotates the first pinion 116b and the second operating portion 117 that rotates the second pinion 117b are also located near the rotation support shaft 112a. Accordingly, the first operating portion 116 and the second operating portion 117 move relatively short distances along with the rotation of the turntable 113, and are positioned within a narrow area. This makes it easy to operate the first operation section 116 and the second operation section 117 . The rack 118 is provided above the rack support 112 b of the base 112 . The base 112 is less deformed over time than the turntable 113 which is distorted by placing the material to be cut thereon. Therefore, the rack 118 has higher durability than the rack provided on the turntable 113 .

As shown in FIG. 40, the first pinion 116b and the first operating portion 116 are integrally formed via the first pinion shaft 116a so as to rotate together. Therefore, the operating force for operating the first operating portion 116 is directly transmitted to the first pinion 116b. Therefore, the first pinion 116b can be operated by the first operating portion 116 with a relatively small force. Also, it is possible to simplify the structures of the first operating portion 116 and the first pinion 116b. Therefore, the cost of forming the first operating portion 116 and the first pinion 116b can be suppressed.

As shown in FIG. 40, the second pinion 117b and the second operating portion 117 are integrally formed via the second pinion shaft 117a so as to rotate together. Therefore, the operating force for operating the second operating portion 117 is directly transmitted to the second pinion 117b. Therefore, the second pinion 117b can be operated by the second operating portion 117 with a relatively small force. It is also possible to simplify the structures of the second operating portion 117 and the second pinion 117b. Therefore, the cost of forming the second operating portion 117 and the second pinion 117b can be suppressed.

As shown in FIG. 41, the second pinion 117b is mounted on the table body so that it can move between an engagement position where it engages with the rack 118 in the extending direction of the second pinion shaft 117a and a release position where the engagement position is released. 114. Therefore, by moving the second pinion 117b from the engagement position to the release position, the turntable 113 can be rotated without rotating the second pinion 117b. Therefore, the turntable 113 can be rotated greatly with a small force. On the other hand, when the second pinion 117b is moved to the engagement position, the position of the turntable 113 can be finely adjusted by the second pinion 117b. Moreover, since the second pinion 117b moves between engagement positions by linear motion, the transmission of the operating force to the rack 118 can be easily switched on and off.

As shown in FIGS. 38 and 39, the table main body 114 has a table outer peripheral wall 115 erected along the outer peripheral edge. The table outer peripheral wall 115 has a front right wall portion 115 a located on the right side of the table extension portion 53 and a front left wall portion 115 b located on the left side of the table extension portion 53 . The first operating portion 116 protrudes radially outward from the front right wall portion 115a. The second operating portion 117 protrudes radially outward from the front left wall portion 115b. Therefore, the first operation unit 116 and the second operation unit 117 are easily visible by the user because they are located near the user. For example, before the material to be cut is placed on the turntable 113, or in the state in which the material to be cut that fits inside the turntable 113 is placed on the turntable 113, the first operation section 116 and the second operation section 117 are operated. Easy to see. This makes it easier for the user to operate the first operating section 116 and the second operating section 117 .

As shown in FIGS. 38 and 39, the cutting machine 110 has a first operating portion 116, a first pinion 116b, a second operating portion 117 and a second pinion 117b. The first operation portion 116 protrudes from the front right wall portion 115a of the table body 114 . The first pinion 116b rotates integrally with the first operating portion 116. As shown in FIG. The second operation portion 117 protrudes radially outward from the front left wall portion 115b of the table body 114 . The second pinion 117b rotates integrally with the second operating portion 117. As shown in FIG. Therefore, the user can select either the first operation portion 116 or the second operation portion 117 to finely adjust the miter angle of the turntable. Therefore, even when the turntable 113 is rotated to the right and the first operation unit 116 is moved to a place where it is difficult to operate, the second operation unit 117 can be operated. Even when the turntable 113 is rotated to the left and the second operation unit 117 is moved to a position where it is difficult to operate, the first operation unit 116 can be operated. As a result, the miter angle of the turntable 113 can be finely adjusted reliably and easily.

As shown in FIG. 41, the rack 118 has an arc-shaped rack body 118a that faces upward, and a plurality of teeth 118b that protrude upward from the rack body 118a and are arranged along the arc. The teeth 118b of the rack 118 and the second pinion 117b (the first pinion 116b) are bevel gears. The second pinion 117b is separated from the rack 118 by moving radially from the rack 118. As shown in FIG.

Therefore, the second pinion 117b meshes with the rack 118 diagonally with respect to the radial direction. Therefore, the second pinion 117b can be engaged with and disengaged from the rack 118 in a short moving distance compared to a structure in which the second pinion 117b engages with the rack 118 vertically. Alternatively, it can be engaged with and disengaged from the rack 118 with a small frictional force. Also, the rack 118 is oriented obliquely with respect to the turntable 113 positioned above. Therefore, when a large downward force is applied from the turntable 113 , the second pinion 117 b slides obliquely downward along the rack 118 . Thereby, the force applied from the turntable 113 to the rack 118 can be reduced.

[Sixth embodiment]
The cutting machine may have an angle fine adjustment mechanism 151 and a lock release lever 160 shown in FIG. 45 instead of the angle fine adjustment mechanism 80 and lock release lever 66 of the first embodiment shown in FIG. A lock release lever 160 of the cutting machine 150 of the sixth embodiment is provided below the grip 61 . The lock release lever 160 is provided so as to be vertically swingable between a lower lock position and an upper unlock position. The unlock lever 160 is biased downward. When the lock release lever 160 is held at the lock position, the rotation position of the turntable 50 is locked. By pulling up the lock release lever 160 and holding it at the unlock position, the lock state of the turntable 50 is released. The unlocking lever 160 can be held at the unlocked position by the operation knob 69 shown in FIG. 2, for example.

As shown in FIG. 45 , the cutting machine 150 has an angle fine adjustment mechanism 151 that adjusts the rotation angle of the turntable 50 with respect to the base 2 . The angle fine adjustment mechanism 151 is provided in the rear region of the base 2 and the turntable 50 behind the positioning fence 56 . As shown in FIG. 48 , the angle fine adjustment mechanism 151 has an operation section 152 and a rack 158 . The rack 158 is provided integrally with a base upper portion 159 attached to the upper portion of the base 2 (see FIG. 46).

As shown in FIG. 48, the rack 158 includes an arcuate rack body 158a centered on an arcuate central axis 158b coaxial with the rotary support shaft 2a (see FIG. 46), and a plurality of racks formed on the arcuate inner surface side of the rack body 158a. teeth 158c. The plurality of teeth 158c are arranged at predetermined intervals in the circumferential direction of the rack body 158a. The tooth 158c extends vertically. A tooth groove is formed between the teeth 158c.

As shown in FIG. 46 , the angle fine adjustment mechanism 151 includes a deceleration mechanism 155 that decelerates the operating force of the operating portion 152 . The deceleration mechanism 155 includes a rotating shaft (first shaft) 153 extending vertically and a deceleration shaft (second shaft) 155a. The rotation shaft 153 and the reduction shaft 155a are arranged in parallel with each other. The rotary shaft 153 is rotatably supported by the turntable 50 (see FIG. 45). The reduction shaft 155a is non-rotatably supported by screwing an upper threaded portion 155aa into a threaded hole provided in the turntable 50. As shown in FIG.

As shown in FIG. 47, the rotary shaft 153 has an operating portion 152 at its upper portion and a first pinion 154 at its lower portion. As shown in FIG. 45, the operating section 152 is positioned above the upper surface of the turntable 50 and can be rotated from above the turntable 50 by the user. The rotating shaft 153 has a flange portion 153d projecting radially below the operating portion 152 . By disposing the flange portion 153d above the upper surface of the turntable 50, the downward displacement of the rotary shaft 153 is restricted. A washer 153 a is interposed between the flange portion 153 d and the upper surface of the turntable 50 .

As shown in FIG. 47 , the first pinion 154 is attached to the rotating shaft 153 so as to rotate integrally with the rotating shaft 153 so as not to be displaceable in the rotating direction. The first pinion 154 is retained by a retaining member 153c attached to the lower end of the rotating shaft 153. As shown in FIG. The rotary shaft 153 is rotatably supported by the turntable 50 (see FIG. 45). When the operating portion 152 rotates around the rotating shaft 153, the operating portion 152, the rotating shaft 153, and the first pinion 154 rotate together. The tooth space of the first pinion 154 extends vertically. The sleeve 153b functions as a spacer for the first pinion 154. As shown in FIG.

As shown in FIG. 47, the reduction shaft 155a includes a coaxially rotatable pinion engagement gear 155b and a second pinion 155c. The tooth grooves of the pinion engaging gear 155b and the second pinion 155c extend vertically. The second pinion 155c is provided below the reduction shaft 155a and engages with the rack 158 (see FIG. 48). The pinion engaging gear 155b is arranged above the second pinion 155c. The pinion engaging gear 155b is engaged with the first pinion 154. As shown in FIG.

As shown in FIG. 47, the speed reduction mechanism 155 has a clutch mechanism 156 . The clutch mechanism 156 has a clutch upper portion 156a and a clutch lower portion 156e. The pinion engagement gear 155b is formed integrally with the clutch upper portion 156a on the outer peripheral portion of the clutch upper portion 156a. The second pinion 155c is formed integrally with the clutch lower portion 156e.

As shown in FIG. 47, the clutch lower portion 156e is attached to the reduction shaft 155a so as to be rotatable together with the reduction shaft 155a. The clutch lower portion 156e is supported from below by a clutch mechanism support portion 155e provided at the lower end of the reduction shaft 155a, and its downward displacement is restricted. The clutch upper portion 156a is disposed axially displaceable above the clutch lower portion 156e with the speed reduction shaft 155a passing through a central shaft hole 156d. A first cam 156b is provided on the lower surface of the clutch upper portion 156a. A second cam 156f is provided on the upper surface of the clutch lower portion 156e. The first cam 156b and the second cam 156f have cam surfaces in which uneven shapes are alternately arranged in the circumferential direction around the speed reduction shaft 155a. The cam surfaces of the first cam 156b and the second cam 156f are formed by spiral surfaces called lead surfaces. Therefore, the first cam 156b and the second cam 156f are in contact with each other over a relatively wide contact area, and the contact state between the surfaces is maintained even if they are displaced from each other in the surface direction.

As shown in FIG. 47, a compression spring 157 is provided above the clutch upper portion 156a. The compression spring 157 is provided between a spring receiving portion 156c (see FIG. 48) provided on the upper portion of the clutch upper portion 156a and a spring holding member 155d attached to the upper portion of the reduction shaft 155a. The compression spring 157 urges the clutch upper portion 156a downward (in the engagement direction between the first cam 156b and the second cam 156f).

As shown in FIG. 48, the first pinion 154 is engaged with the pinion engaging gear 155b and the second pinion 155c is engaged with the rack 158. As shown in FIG. The rotational speed of the operating portion 152 is reduced by the engagement between the first pinion 154 and the pinion engagement gear 155b. When the torque applied to the pinion engagement gear 155b is relatively small, the clutch upper portion 156a is biased by the compression spring 157 to the lower engagement position. Thereby, the first cam 156b and the second cam 156f shown in FIG. 47 are engaged. Rotational power of the clutch upper portion 156a is transmitted to the clutch lower portion 156e by engagement of the first cam 156b and the second cam 156f. The second pinion 155c integral with the clutch lower portion 156e rotates, and the second pinion 155c moves along the rack 158. As shown in FIG. As a result, the turntable 50 (see FIG. 45) rotates about the arc center axis 158b with respect to the base upper portion 159 supporting the rack 158 shown in FIG. Thus, the rotational position of the turntable 50 can be finely adjusted.

For example, when the lock release lever 160 shown in FIG. 46 is at the lock position, movement of the turntable 50 (see FIG. 45) with respect to the base 2 is restricted. As a result, the second pinion 155c shown in FIG. 49 does not move along the base upper portion 159. In this case, when the operating portion 152 is rotated, torque of a predetermined value or more is applied to the clutch upper portion 156a engaged with the first pinion 154. As shown in FIG. As a result, the first cam 156b (see FIG. 47) rides up against the biasing force of the compression spring 157 to the disengaged position above the second cam 156f. The first cam 156b positioned at the disengaged position is disengaged from the second cam 156f. Thus, power transmission from the clutch upper portion 156a to the clutch lower portion 156e is interrupted. Even when the clutch upper portion 156a moves to the disengaged position, the engaged state between the first pinion 154 and the pinion engagement gear 155b is maintained.

As shown in FIG. 46, the angle fine adjustment mechanism 151 has a clutch mechanism 156 . The clutch mechanism 156 cuts off the power for rotating the turntable 50 (see FIG. 45) with respect to the base 2 when a torque of a predetermined level or more is applied.

Therefore, for example, when the lock release lever 160 is at the lock position and the turntable 50 is fixed to the base 2, the fine angle adjustment mechanism 151 is operated. Since the turntable 50 is immovable, the rotation of the second pinion 155c engaged with the rack 158 is restricted. As a result, the clutch mechanism 156 is actuated by applying torque of a predetermined value or more to the clutch mechanism 156 . When the clutch mechanism 156 is actuated, the angle fine adjustment mechanism 151 idles, and unnecessary force is suppressed from being applied to the rack 158, the second pinion 155c, and the like. Thus, damage to rack 158, second pinion 155c, etc. can be prevented. In addition, the idle rotation of the angle fine adjustment mechanism 151 can easily inform the user that the turntable 50 is fixed to the base 2 .

As shown in FIG. 47, the reduction mechanism 155 has a rotation shaft 153 that can rotate integrally with the operation unit 152, and a reduction shaft 155a that can rotate at a reduced speed with respect to the rotation shaft 153. As shown in FIG. The clutch mechanism 156 is provided on the reduction shaft 155a.

Therefore, the torque applied to the speed reduction shaft 155a when operating the angle fine adjustment mechanism 151 is larger than that of the rotating shaft 153 . Therefore, the torque received by the clutch mechanism 156 is larger when it is provided on the reduction shaft 155 a than when it is provided on the rotation shaft 153 . That is, when the clutch mechanism 156 is provided on the deceleration shaft 155a, a torque range that can be set is wide when setting a predetermined torque that enables the clutch mechanism 156 to operate. Therefore, the degree of freedom in designing the clutch mechanism 156 is high. For example, it is easy to set the urging force with which the compression spring 157 urges the clutch upper portion 156a, and for example, it is easy to set the inclination of the lead surfaces of the first cam 156b and the second cam 156f. In addition, a predetermined torque setting can be maintained without the need for fine adjustment. Furthermore, the predetermined torque can be set relatively high. Therefore, when operating the angle fine adjustment mechanism 151, the user does not need to finely adjust the operating force, and the operability is good.

As shown in FIG. 47, the clutch mechanism 156 has a first cam 156b and a second cam 156f that engage with each other to enable power transmission. Power is interrupted by disengaging the first cam 156b and the second cam 156f. The second cam 156f is integrally formed with the second pinion 155c that directly engages the rack 158. As shown in FIG. Therefore, the number of parts of the angle fine adjustment mechanism 151 can be reduced, and the angle fine adjustment mechanism 151 can be made compact.

Various modifications can be made to the cutting machines 1, 110, 150 of the embodiments described above. For example, a configuration may be adopted in which a plurality of angle fine adjustment mechanisms 80 shown in FIG. 35 are provided along the circumferential direction of the rack body 86a. For example, only one of the right angle fine adjustment mechanism 111A and the left angle fine adjustment mechanism 111B shown in FIG. 39 may be provided. For example, the configuration may include both the angle fine adjustment mechanism 80 shown in FIG. 35 and the angle fine adjustment mechanism 111 shown in FIG. Instead of the fine angle adjustment mechanism 80 shown in FIG. 35, for example, a fine angle adjustment mechanism may be provided in which the first pinion 83 moved to the engagement position directly meshes with the rack 86 .

Instead of the rack 86 and reduction shaft 85 on the inner wall portion 2e shown in FIG. As a reduction mechanism interposed between the first pinion 83 and the rack 86, instead of the reduction shaft 85, for example, a planetary gear may be provided. Instead of the compression spring 84 shown in FIG. 37, an elastic member such as rubber may be used to urge the first pinion 83 to the release position. For example, a biasing member may be provided to bias the first pinion 116b and the second pinion 117b shown in FIG. 39 to the release position (outward in the radial direction). For example, the rotating shaft 153 may be provided with the clutch mechanism 156 . Instead of the angle fine adjustment mechanism 151, for example, an angle fine adjustment mechanism that finely adjusts the position of the turntable 50 by rotating a screw may be provided, and the angle fine adjustment mechanism may be provided with a clutch mechanism.

1...Cutting machine (desktop cutting machine)
2 Base 2a Rotating shaft 2e Inner wall 3 Auxiliary table 10 Cutting machine main body 10a Vertical swing shaft 11 Cutting tool 12 Fixed cover (cutting tool cover) 12a Support shaft hole 12b~ e... Motor housing/fixing cover fastening screw 12f... Right handle/fixing cover fastening screw 13... Movable cover 14... Fixing screw 15... Outer flange 16... Dust collection guide 20... Motor housing, 20a... Air intake hole 20b... Protrusion, 20c... screw hole 20d... side surface 20e... motor housing/right handle/left handle fastening screw 20g-j... insertion hole 21... shield (first ventilation part, positioning mechanism) 21a... first ventilation hole 22 Positioning part 22a Rail 25 Motor 25a Motor shaft 25b Stator 25c Rotor 25d Sensor board 26 Motor fan 30 Adapter (first adapter) 30a Body mounting part 30b Screw hole 30g Adapter/Right handle/Left handle Fastening screw 30c First surface 30d Second surface 30e Body engagement surface 30f Bottom surface 31 Positioning portion 31a Rail 31b Locking Part 31c... Flat part 31d... Standing part 31e... Overhanging part 32... Battery attachment part (first battery attachment part) 32a... Rail 33... Ventilation part (second ventilation part, positioning mechanism) 33a... Second Ventilation hole 33b Notch 34 Lead wire 35 Controller 36 Right exhaust window 37 Left exhaust window 38 Terminal 38a Terminal base 38b, 38c Power supply terminal 38d Signal terminal 40 Battery 40a Disengagement button 40b Engaging claw 40c Rail 40d Connection terminal 41 Communication adapter 45 Handle 45a Main handle 45b Lock off button 45c Switch lever 45d Carrying handle 45e Switch for line alignment laser irradiation)
45f...switch (for lighting fixture lighting)
46 Right portion of handle 46a, 46b Fitting hole 46c Insertion hole 47 Left portion of handle 48 Lighting fixture 49 Laser irradiator 50 Turntable 51 Table body 52 Table outer wall 53 Table extension , 53a... screw hole, 53b... front side support part, 53c... rear side support part 54... cutting edge plate 55... groove hole 56... positioning fence 56a... positioning surface 57... adjusting bolt 58... miter scale plate 58a... fixing screw, 58b Positioning recess 60 Table positioning mechanism 61 Grip 62 Fixed rod 62a Threaded shaft 63 Protection plate 65 Positive lock mechanism 66 Unlock lever 66a Rear end 66b Compression spring 66c Operation Part 66d... Swing shaft part 67... Positioning pin 67a... Rear end part 68... Engagement pin 69... Operation knob 69a... Leaf spring 70... Main body support part 70a... Horizontal tilt support shaft 71... Slide bar 80... Angle Fine adjustment mechanism 81 Operation unit 82 Rotary shaft 83 First pinion 84 Compression spring 85 Reduction shaft (reduction mechanism) 85a Pinion engagement gear 85b Second pinion 86 Rack 86a Rack body 86b... Arc central axis 86c... Teeth 101... Adapter (second adapter)
DESCRIPTION OF SYMBOLS 102... Positioning part 103... Battery mounting part (2nd battery mounting part) 103a... Rail 105... Battery (2nd battery) 105a... Disengagement button 110... Cutting machine (tabletop cutting machine)
111... Angle fine adjustment mechanism 111A... Right angle fine adjustment mechanism, 111B... Left angle fine adjustment mechanism 112... Base 112a... Rotating spindle, 112b... Rack support, 112c... Positioning recess 113... Turntable 114... Table body DESCRIPTION OF SYMBOLS 115... Table outer peripheral wall 115a... Front right wall part 115b... Front left wall part 116... First operation part 116a... First pinion shaft 116b... First pinion 117... Second operation part 117a... Second pinion Axle 117b Second pinion 118 Rack 118a Rack body 118b Teeth 121 Angle fine adjustment mechanism 122 Base 122b Rack support 127 Second operation part 127a Second pinion shaft 127b Second pinion 128 Rack 128a Rack main body 128b Teeth 131 Angle fine adjustment mechanism 132 Base 132b Rack support 137 Second operation part 137a Second pinion shaft 137b Second pinion 138 Rack 138a Rack body 138b Teeth 141 Angle fine adjustment mechanism 142 Base 142b Rack support base 147 Second operation part 147a Second pinion shaft 147b Second pinion 148 Rack 148a ... rack body, 148b ... tooth 150 ... cutting machine (tabletop cutting machine)
DESCRIPTION OF SYMBOLS 151... Angle fine adjustment mechanism 152... Operation part 153... Rotating shaft (first shaft) 153a... Washer 153b... Sleeve 153c... Retaining member 153d... Flange part 154... First pinion 155... Reduction mechanism 155a... Reduction shaft (Second shaft) 155aa Threaded portion 155b Pinion engagement gear 155c Second pinion 155d Spring holding member 155e Clutch mechanism support portion 156 Clutch mechanism 156a Clutch upper portion 156b First cam 156c... Spring receiving portion 156d... Shaft hole 156e... Lower part of clutch 156f... Second cam 157... Compression spring 158... Rack 158a... Rack main body 158b... Circular center shaft 158c... Teeth 159... Upper base 160... Lock release lever

Claims (14)

A tabletop cutting machine,
a turntable provided rotatably on a horizontal plane with respect to the base;
a cutting machine main body positioned above the turntable and connected to the turntable so as to be vertically swingable;
Having an angle fine adjustment mechanism for adjusting the rotation angle of the turntable with respect to the base,
The turntable has a substantially disk-shaped table body on which a material to be cut is placed, and a table extension part projecting forward from the table body,
The fine angle adjustment mechanism includes a rack provided on the base, and a pinion provided on the table body so as to be positioned within the area of the table body in top view and directly or indirectly engaged with the rack. , an operating part that is gripped by a user to rotate the pinion ;
The pinion is positioned below the upper surface of the turntable along the rear peripheral region of the table body,
The operation unit is a desktop cutting machine positioned directly above the upper surface of the turntable along the outer peripheral rear region of the table body . The desktop cutting machine according to claim 1,
A positioning fence for positioning the material to be cut is provided above the upper surface of the turntable,
A desktop cutting machine in which the pinion and the operating part are always positioned behind the positioning fence. The desktop cutting machine according to claim 1 or 2,
a lock mechanism that positions the turntable at a predetermined rotation angle;
a lock release lever that moves to an unlock position to release the locked state of the lock mechanism;
A desktop cutting machine having a lever holding portion that holds the unlocking lever at the unlocking position. The desktop cutting machine according to any one of claims 1 to 3 ,
The pinion is movable in the extending direction of the rotation shaft of the pinion to move between an engagement position where the rack is directly or indirectly engaged and a release position where the engagement with the rack is released. A desktop cutting machine provided on the table body. The desktop cutting machine according to claim 4 ,
The rack has an arc-shaped rack body and a plurality of teeth projecting from the rack body in the radial direction of the arc and arranged along the arc,
A desktop cutting machine, wherein the pinion is provided on the table body so that the rotation axis of the pinion and the arc center axis of the rack body are parallel. The desktop cutting machine according to claim 4 ,
A tabletop cutter having a spring biasing the pinion from the engaged position toward the disengaged position. The desktop cutting machine according to any one of claims 1 to 4 ,
The table main body has a table outer peripheral wall standing along the outer peripheral edge,
The outer peripheral wall of the table has a front right wall portion located on the right side of the table extension portion and a front left wall portion located on the left side of the table extension portion,
The desktop cutting machine, wherein the operation portion protrudes radially outward from at least one of the front right wall portion and the front left wall portion. A desktop cutting machine according to claim 7 ,
a first operation portion projecting from the front right wall portion of the table body as the operation portion;
a first pinion that rotates integrally with the first operating portion as the pinion;
a second operating portion protruding radially outward from the front left wall portion of the table body;
A desktop cutting machine having a second pinion that rotates integrally with the second operating section. The desktop cutting machine according to claim 7 or 8 ,
The rack has an arc-shaped rack body that faces upward or downward, and a plurality of teeth that protrude upward or downward from the rack body and are arranged along the arc,
A table cutting machine wherein the teeth of the rack and the pinion are bevel gears, and the pinion disengages from the rack by moving radially from the rack. The desktop cutting machine according to any one of claims 7 to 9 ,
A desktop cutting machine in which the pinion and the operation unit are integrally formed so as to rotate integrally. The desktop cutting machine according to any one of claims 1 to 10 ,
A desktop cutting machine in which a reduction mechanism is interposed between the pinion and the rack to reduce the rotational speed of the pinion and transmit the speed to the rack. The desktop cutting machine according to any one of claims 1 to 11 ,
The fine angle adjustment mechanism has a clutch mechanism that cuts off the power for rotating the turntable with respect to the base when a predetermined torque or more is applied. A desktop cutting machine according to claim 11 ,
The angle fine adjustment mechanism has a clutch mechanism that cuts off the power for rotating the turntable with respect to the base when a predetermined torque or more is applied,
The reduction mechanism has a first shaft rotatable integrally with the operation unit and a second shaft rotatable at a reduced speed with respect to the first shaft,
The desktop cutting machine, wherein the clutch mechanism is provided on the second shaft. A tabletop cutting machine according to claim 13 ,
The clutch mechanism has a first cam and a second cam that are engaged with each other to transmit power, and the power is cut off when the first cam and the second cam are disengaged. and
The second cam is integrally formed with the pinion directly engaging the rack.

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