Rotating circular saw unit and board processing machine equipped with same

Abstract

To develop a novel revolving circular saw unit in a simple structure for revolving a circular saw, allowing a revolving response instantly and exactly and capable of improving work efficiency as the whole device and a board processing disc using the revolving circular saw unit.SOLUTION: A revolving circular saw unit 1 of the invention comprises a unit frame 2, a revolving frame 3 and a circular saw body 5, and further comprises a revolving drive motor 6 for allowing the revolving frame 3 to revolve and drive to the unit frame 2 and a circular saw drive motor 7 for driving the circular saw body 5. A revolving center of the revolving frame 3 matches with an output center of the revolving drive motor 6 and the rotation center of the circular saw body 5 matches with the output center of the circular saw drive motor 7.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a circular saw unit suitable for cutting out material of a desired shape from a board material such as plywood, and to a board processing machine equipped with the same. [Background technology]

[0002] Plywood and decorative boards are supplied as standard boards, for example, so-called 3×6 boards, approximately 90 cm wide and 180 cm long, and are cut and processed using a saw or router according to the specifications required at each construction site (see, for example, Patent Documents 1 and 2). Specifically, in the construction of buildings, form panels of the desired shape are cut out from fixed-size plywood, abbreviated as "compane," and these are assembled to form the desired concrete formwork. Recently, cutting of such plywood is not done on-site, but rather tends to be done in advance in a factory according to the design specifications. Of course, cutting is required not only for formboard boards, but also for decorative plywood and the like, according to the location where it will be installed. In such cutting operations, a revolving circular saw unit capable of freely setting the direction of the cutting line is used as a suitable processing tool.

[0003] However, the current mechanism for rotating the circular saw blade, which is directly responsible for the cutting action, requires a rotating drive motor as a drive source and an intermediate member of a speed reduction mechanism system that reduces the speed of the motor to drive the rotating frame. For this reason, it has not been possible to sufficiently shorten the tact time, including the switching of working means such as the rotation of the circular saw blade, and there is a certain limit to the improvement of processing efficiency. In particular, when obtaining formwork materials to be used in constructing concrete stairs or the like, it is necessary to frequently change the direction of the saw blade and continuously cut out the boards in a stepped shape, and when performing such processing, the above-mentioned inconveniences become prominent. In addition, as the power transmission system becomes more complicated, backlash in gears and the like also increases synergistically, making it difficult to accurately set the angle of the saw blade, that is, making it difficult to change the cutting direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-155801 [Patent Document 2] Japanese Patent Application Publication No. 6-23703 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention was made taking into consideration the above-mentioned background, and its technical objective was to develop a new rotating circular saw unit and a board processing machine using the same, which has a simple structure for rotating the circular saw blade, and which can achieve instantaneous and accurate rotation response and improve the work efficiency of the entire device. [Means for solving the problem]

[0006] First, the rotating circular saw unit according to claim 1 is A unit frame, a rotating frame that is rotatably provided on the unit frame; A circular saw unit including a circular saw blade body provided on the rotating frame, The rotating circular saw unit includes a rotating drive motor that rotates the rotating frame, and a circular saw blade drive motor that drives the circular saw blade body. The rotating center of the rotating frame is configured to coincide with the output center of the rotating drive motor, and the rotation center of the circular saw blade body is configured to coincide with the output center of the circular saw blade drive motor. the law of nature, Furthermore, the center of rotation of the rotating frame is set to an allowable coincidence with the center of gravity of the members including the rotating frame, the circular saw blade body, and the circular saw blade drive motor. The present invention is characterized by the following points.

[0007] The circular saw unit according to claim 2 has, in addition to the features of claim 1, The slewing drive motor is a torque motor, characterized in that a stator is disposed on a unit frame, and a rotor is provided on a slewing shaft of a slewing frame.

[0008] Also, claims 3 The circular saw unit described in claim 1 OR 2 In addition to the requirements listed above, The circular saw blade body includes a dust collection cover, This dust collection cover communicates with an annular dust collection duct arranged above it, and the turning drive motor is arranged in the inner space of this annular dust collection duct.

[0009] Also, claims 4 The board processing board described is A board processing machine that performs the intended cutting process on a workpiece placed on a table by using a rotating circular saw unit, This board processing machine has a rectangular work table in a plan view and a traveling frame that is arranged to straddle the work table in the width direction and is movable along the longitudinal direction of the work table. M and and a revolving circular saw unit supported on the traveling frame so as to be movable in the width direction and the up-down direction. The circular saw unit according to claim 1 3 The present invention is characterized in that the rotating circular saw unit according to any one of claims 1 to 5 is applied. The above problems are solved by the configurations of the inventions described in each of these claims. Effect of the Invention

[0010] First, according to the invention described in claim 1, the center of rotation of the swivel frame is configured to coincide with the output center of the swivel drive motor, and the center of rotation of the circular saw blade body is configured to coincide with the output center of the circular saw blade drive motor, so that it is not necessary to provide intermediate members such as speed reducers in these transmission systems, and for example, the turning operation to change the cutting direction of the circular saw can be performed in a short time. In addition, the power transmission system can be configured simply, backlash that occurs when gears or the like are used as intermediate members can be eliminated, and the cutting direction of the circular saw blade can be changed (angle setting) more accurately and smoothly. In addition, according to the present invention, the center of rotation of the rotating frame is set to an allowable alignment state (set to nearly coincide) with the center of gravity of the component (circular saw) including the rotating frame, the circular saw blade body, and the circular saw blade drive motor, so that the circular saw can be rotated smoothly and stably, and inertia in a series of operations such as starting and stopping the rotation is minimized, allowing the above-mentioned rotation operation (switching operation) to be performed in a shorter time.

[0011] According to the invention described in claim 2, a specific configuration of the turning drive motor can be realized.

[0012] Also, claims 3 According to the described invention, the swivel drive motor is arranged in the inner space of the annular dust collection duct, so that the swivel drive motor can be stored compactly within the swivel circular saw unit, allowing the swivel circular saw unit to be configured more simply.

[0013] Also, claims 4 According to the described invention, by applying the rotating circular saw unit described in any one of claims 1 to 4, when cutting formwork material from a single board material, for example for use in constructing a concrete staircase, it is necessary to frequently change the direction of the circular saw blade to cut out the material in a continuous stepped pattern, but such work can be performed smoothly and stably. [Brief description of the drawings]

[0014] [Figure 1] 1A is a perspective view showing a board cutting machine equipped with a rotating circular saw unit of the present invention, and FIG. 1B is a schematic explanatory diagram viewed from the direction A in FIG. [Diagram 2] 1A and 1B are two perspective views of a rotating circular saw unit viewed from different directions. [Diagram 3] FIG. 2 is a perspective view showing the revolving circular saw unit in a vertical cross-sectional state. [Figure 4]1A is a side view of a circular saw unit, FIG. 1B is a front view of the circular saw unit, and FIG. 1C is a bottom view of the circular saw unit as viewed from the direction B in FIG. [Diagram 5] 1A is an exploded perspective view of a rotating circular saw unit, and FIG. 1B is two plan views showing the operating state of a rotating stopper. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present invention is as shown in the following examples, but these examples can be modified as appropriate within the scope of the technical concept of the present invention. EXAMPLES

[0016] The revolving circular saw unit 1 of the present invention and the board cutting machine 100 equipped with the same will be described in detail below. First, the rotating circular saw unit 1 can be mounted on an appropriate board processing machine or the like, and as an example, as shown in Fig. 1, it is attached to a board processing machine 100, and an appropriate cutting angle is selected and switched to perform the desired cutting process on the workpiece W. Here, the symbol W1 in Fig. 1 indicates a material cut out into a desired shape from the workpiece W, and for example, the cutting direction is switched appropriately in a zigzag shape to obtain a stepped material (cut out material W1).

[0017] The revolving circular saw unit 1 will now be described. As shown in Figure 3 as an example, the rotating circular saw unit 1 comprises a unit frame 2 and a rotating frame 3 which is rotatably mounted on the unit frame 2, and the rotating frame 3 supports a circular saw M comprising a circular saw blade main body 5 and a circular saw blade drive motor 7. The unit frame 2 is equipped with a swivel drive motor 6 that reciprocates the swivel frame 3 by an appropriate angle. The swivel circular saw unit 1 is configured so that the swivel center of the swivel frame 3 coincides with the output center of the swivel drive motor 6, and the rotation center of the circular saw blade main body 5, which is a rotating member, coincides with the output center of the circular saw blade drive motor 7, which is one of the major features of the present invention.

[0018] Each member constituting the revolving circular saw unit 1 will be described in detail below. First, the unit frame 2 has a unit base 21 as its main component, which is a metal component that serves as a strength member and has a horizontal T-shape in side cross section, as shown in Figure 3 above, for example. When viewed with the protective cover 27, which serves as the top panel, attached, it has a horizontal L-shape in side cross section, as shown in Figures 2 to 5, for example, and is rectangular in plan view. The drive mount portion 22, which is a flat portion of the unit base 21, supports fixed members such as various drive systems described below, and a nearly vertical lift mount portion 23 is formed integrally with the end of the drive mount portion 22, perpendicular to the drive mount portion 22. The lift mount portion 23 includes a secondary lift linear bearing 24 for mounting to a board processing board 100 described below. Furthermore, the unit frame 2 is provided with a dust collection duct 26 suspended below the drive mount portion 22. This dust collection duct 26 has a rectangular shape in vertical cross section and is formed to form an annular shape overall. Also, above the drive mount portion 22, the protective cover 27 is provided as described above.

[0019] The above-mentioned swivel frame 3 is provided as another frame member for the unit frame 2. The swivel frame 3 is configured so that the swivel shaft 31 can rotate with respect to the unit base 21, which is the fixed frame, and the center of the swivel shaft 31 is hollow and provided with a cable guide hole 31a. Incidentally, this cable guide hole 31a is for passing a power supply wiring to the circular saw blade drive motor 7. The swivel shaft 31 is rotatably attached to a fixed side, i.e., a member on the unit frame 2 side, in a suspended state via a radial bearing 321 and a spacer collar 322, and has a flange 33 at its lower end which is fixed to the rotor 62 of the swivel drive motor 6. A hanging bracket 34 is fixed to the underside of this flange 33, and the circular saw M, i.e., the circular saw blade main body 5 and the circular saw blade drive motor 7, are supported in a suspended state via this hanging bracket 34.

[0020] Next, the circular saw blade body 5 will be described. This is a circular saw blade having an appropriate diameter, and a dust collection cover 51 is further provided around the circular saw blade body 5 (around the upper part). As shown in FIG. 2(a) as an example, this dust collection cover 51 is formed by extending a chip discharge duct 52 obliquely upward from a part of it. As shown in FIG. 3 as an example, the chip discharge duct 52 is provided with an annular swivel cover 53 at its upper end, and this swivel cover 53 essentially constitutes the bottom and inner surface plate of the dust collection duct 26 fixedly attached to the unit frame 2 side. As a result, the area around the circular saw blade main body 5, i.e., the inside of the dust collection cover 51 and the dust collection duct 26, are connected by the chip discharge duct 52, and cutting chips from the workpiece W generated when the circular saw blade main body 5 cuts are sucked from inside the dust collection cover 51 through the chip discharge duct 52 into the dust collection duct 26, and are ultimately discharged to the outside through the dust collection hose 26a connected to the dust collection duct 26 (see Figure 2).

[0021] The dust collection duct 26 is fixed to the unit frame 2, while the swivel cover 53 is configured to be able to rotate with the rotation of the circular saw blade body 5, so that the inside of the dust collection duct 26 is kept sealed regardless of the rotation of the circular saw blade body 5. To explain in more detail, for example, as shown in Figs. 5 and 3, the dust collection duct 26 is formed by integrally forming an outer plate and a top plate that form a rectangular duct cross section, forming an outer ring part of the duct that is L-shaped in vertical cross section. On the other hand, the swivel cover 53 is formed by integrally forming an inner plate and a bottom plate that form a rectangular duct cross section, forming an inner ring part of the duct that is L-shaped in vertical cross section. By combining these two members inside and outside, the annular dust collection duct 26 with a hollow interior is three-dimensionally formed, and the connection part between the dust collection duct 26 and the swivel cover 53 is configured to be sealed from the outside by seal flaps 261, 531 on both the upper and lower surfaces. With this configuration, the dust collection duct 26 is structured such that the inside of the dust collection duct 26 is kept airtight even when the swivel cover 53 swivels (rotates). In addition, since the dust collection duct 26 is formed in an annular shape, the inner space of the annular shape is utilized to arrange the revolving drive motor 6. Of course, such a configuration contributes to compact accommodation of the revolving drive motor 6, and furthermore, the entire revolving circular saw unit 1 can be configured more simply.

[0022] Next, the drive system for such members will be described. First, a torque motor is applied as the swivel drive motor 6, and as an example, a stator 61 and a rotor 62 are arranged one above the other, as shown in Fig. 3. Of these, the stator 61 is fixed to the unit base 21 of the unit frame 2, while the rotor 62 is fixed to the flange 33 of the swivel shaft 31 of the swivel frame 3, and the rotor 62 serves as a motor that drives the swivel frame 3. As a result, the center of rotation of the rotor 62 coincides with the center of rotation of the swivel frame 3.

[0023] Next, the circular saw blade drive motor 7 will be described. This uses a general brushless motor or the like, and the hanging bracket 34 is fixed to the main body casing 71, and the output shaft 72 of the motor is connected to the circular saw blade main body 5 to rotate the circular saw blade. This results in a configuration in which the center of the output shaft 72 of the circular saw blade drive motor 7 coincides with the center of the circular saw blade main body 5. Incidentally, it is preferable that the position of the center of gravity of the circular saw blade main body 5, the circular saw blade drive motor 7, and the rotating frame 3 as an integrated member (circular saw M) coincides with the center of rotation of the rotating shaft 31, in order to more stably rotate the circular saw M, and also to perform a series of rotation operations from the start of rotation to the stop of rotation smoothly and in a short time. However, in reality, it is difficult to perfectly align the center of rotation of the rotating frame 3 with the center of gravity position, so in practice, some misalignment between the center of rotation of the rotating frame 3 and the center of gravity position is acceptable as long as the series of rotating operations of the circular saw M can be performed smoothly and no hindrance occurs, and in this sense, it is referred to as an ``acceptable alignment state'' in the claims.

[0024] The pivot shaft 31 also has a brake unit 8 at its upper end. This brake unit 8 comprises a brake stator 81 which is non-rotating but can slide freely in the axial direction, and a brake rotor 82 which rotates together with the pivot shaft 31. For example, when cutting into a board (workpiece W), the brake stator 81 is caused to slide in the axial direction and pressed tightly against the brake rotor 82 which rotates together with the pivot shaft 31, thereby preventing the pivot shaft 31 from rotating (when the brake is activated). On the other hand, when changing the cutting direction of the circular saw M, the brake stator 81 is separated from the brake rotor 82 to allow the swivel shaft 31 to rotate. An encoder (not shown) is driven from the brake rotor 82 via a timing-settable transmission belt such as a toothed belt. This controls the operating state of the swivel shaft 31 according to program commands, for example, to control rotation, stop, or reverse rotation.

[0025] Next, the rotation stopper 9 will be described. This is for preventing further rotation of the rotation shaft 31 when it has rotated (rotated) to the maximum in the clockwise or counterclockwise direction, and as an example, as shown in Figure 5, it comprises a stopper shaft 91 fixed to the drive mount 22 by a bolt or the like, and a stopper rotor 92 which rotates (rotates) together with the rotation shaft 31. The stopper rotor 92 comprises a rotor body 93 having an abutment portion 932, a cover body 94 and a base body 95 provided above and below the rotor body 93, and the base body 95 is fixed to the rotating shaft 31 by screwing or the like, and is configured to rotate (swivel) as a single unit.

[0026] The rotor body 93 has a roughly disk-shaped body portion 931, and a protruding portion that protrudes from the outer periphery of this body portion 931 becomes the abutment portion 932, which is formed integrally with the body portion 931. When the rotating shaft 31 rotates (turns) to the maximum extent in the clockwise or counterclockwise direction, the side surface of this abutment portion 932 abuts against the side portion of the stopper shaft 91, thereby preventing the rotating shaft 31 from rotating any further. 5(b) shows the state where the base body 95, i.e., the pivot shaft 31 has rotated (pivoted) to the maximum extent in the clockwise and counterclockwise directions. In this figure, when the saw shaft (pivot shaft 31) is at a pivot angle of 0°, one side surface of the abutment portion 932 abuts against the side portion (here, the lower side) of the stopper shaft 91, preventing the pivot shaft 31 from pivoting any further (counterclockwise rotation is prevented in plan view).

[0027] On the other hand, when the saw shaft (pivot shaft 31) has a rotation angle of 360°, the opposite side of the abutment portion 932 abuts against the opposite side (here, the upper side) of the stopper shaft 91, preventing the pivot shaft 31 from rotating any further (in a plan view, clockwise rotation is prevented). In addition, in the structure that prevents further rotation by the abutment of the stopper shaft 91 with the abutment portion 932, the rotation angle of the swivel shaft 31 is strictly less than 360° (this is the unachieved rotation range) due to the outer dimensions of the swivel shaft 31 and the width of the abutment portion 932. Therefore, in this embodiment, a groove-shaped angle supplementing portion 933 is formed in the rotor body 93, which allows the base body 95 that rotates together with the swivel shaft 31 to rotate more than the rotor body 93, thereby compensating for the unachieved rotation range. With this configuration, the swivel shaft 31 (base body 95) can rotate 360°. Incidentally, the rotation angle of the swivel shaft 31 can theoretically be set without any restrictions, so to speak, depending on the rotation of the swivel drive motor 6. However, in this embodiment, the rotation angle is set to 360° as described above, which is a sufficient angle for practical use, and the swivel stopper 9 is provided for this purpose.

[0028] The revolving circular saw unit 1 of the present invention has the above-mentioned configuration, and this revolving circular saw unit 1 is attached to, for example, a traveling frame 120 of a board processing machine 100, and as an example, a board processing machine 100 equipped with the revolving circular saw unit 1 (hereinafter simply referred to as board processing machine 100) is configured as shown in Fig. 1. Such a board processing machine 100 will be described below. First, reference numeral 110 in the drawing denotes a work table, which has side guide rails 112 provided in the longitudinal direction on the side of a support frame 111, and a number of suction nozzles 113 provided on the upper surface of the work table 110. Also, a number of fitting rulers 114 are disposed so as to protrude upward on the four peripheral sides of the work table 110. With this configuration, the work W supported on the work table 110 is held by suction, and is placed in a state in which it is accurately positioned by the fitting rulers 114.

[0029] A gantry-type traveling frame 120, for example, is provided to straddle this work table 110. Of course, the traveling frame 120 itself does not necessarily have to be formed in such a gate shape, and when the width of the work table 110 is narrow, it may be configured in a so-called cantilevered state.

[0030] The traveling frame 120 has an upper frame 122 that is bridged over the leg frames 121 on both sides, and linear bearings 123 are provided on the inside of both leg frames 121. This linear bearing 123 slides along the side guide rails 112 of the support frame 111 of the work table 110, and is configured to enable the traveling frame 120 to run smoothly and stably on the work table 110.

[0031] A lateral rail 124 is provided on the upper frame 122 of the traveling frame 120, and a lateral base 130 is provided using the lateral rail 124 as a support member. That is, the lateral base 130 is configured to have a lateral linear bearing 131 provided at a position corresponding to the lateral rail 124, and to be movable along the width direction of the upper frame 122. A main lifting rail 133 is separately provided on a support plate 132 serving as a front plate of the lateral base 130. A main lifting shift motor 134 is provided above the main lifting rail 133, and further, a lateral screw shaft, which is a ball screw, and a lateral drive motor (both not shown) for moving the lateral base 130 in a lateral direction are mounted thereon.

[0032] A lift base 140, which uses a main lift rail 133 as a support member, is provided for the traverse base 130. The lift base 140 has a main lift linear bearing 141 attached in a meshed state with the main lift rail 133. The lift base 140 is driven to move up and down by a screw shaft 135 driven by a main lift shift motor 134. In addition, the lifting base 140 is provided with a secondary lifting rail 142 and a secondary lifting shift motor 143, and a screw shaft 144 connected to the output shaft thereof screws into a threaded block 25 provided on the rotating circular saw unit 1, and is responsible for lifting and shifting the rotating circular saw unit 1.

[0033] As can be seen from this configuration, the revolving circular saw unit 1 provided on the traveling frame 120 of the board processing machine 100 is configured to be able to move up and down with a large stroke while supported on the lifting base 140 as a whole (this is called the "main lifting"). On the other hand, the revolving circular saw unit 1 is configured to be able to move up and down with a lifting stroke that is much smaller than the lifting stroke of the lifting base 140 by driving the sub-lifting shift motor 143 provided on the lifting base 140 (this is called the "sub-lifting", and as an example, the vertical stroke is about 100 mm). Incidentally, the reason why the revolving circular saw unit 1 is made doubly movable up and down is that, as shown in Figure 1, a board processing machine 100 is often provided with a router unit 150 in addition to the revolving circular saw unit 1, and when this router unit 150 is operated, the revolving circular saw unit 1 is raised slightly above the workpiece W so as not to interfere with the router processing. Similarly, although not shown in detail, the router unit 150 is also configured to be raised slightly when the revolving circular saw unit 1 is operating so that the router unit 150 does not act on the workpiece W.

[0034] The present invention has the above-mentioned configuration, and its operation will be described below. (1) Setting the workpiece and preparing the board processing machine First, a board-shaped workpiece W to be processed is placed at an appropriate position on the work table 110. At this time, the workpiece W is set to a reference position by a set ruler 114, and is securely fixed on the work table 110 by a suction nozzle 113. On the other hand, as a preparatory work for the board processing machine 100, instruction data such as cutting lines corresponding to the product to be obtained by cutting the workpiece W is inputted appropriately from CAD data or the like. After such an instruction is inputted, an appropriate start signal is sent, and the traveling frame 120 and the traverse base 130 operate to the desired position, and a starting point specified by XY coordinate values ​​is set so that the circular saw blade main body 5 is positioned at the start position of the cutting work. Of course, at this time, the circular saw blade main body 5 is set to be positioned (standby) above the workpiece W.

[0035] (2) The circular saw unit starts rotating Next, the swivel circular saw unit 1 orients the circular saw blade body 5 in an appropriately set cutting direction (angle). This operation is performed by driving the swivel drive motor 6, and the rotor 62 rotates in response to a command signal, and the rotating shaft 31 attached integrally thereto rotates appropriately to set the circular saw blade body 5 in the designated cutting direction. In this invention, the swivel shaft 31 attached to the rotor 62, which is the output side of the swivel drive motor 6, is the actual output shaft, but since it is directly connected to the rotor 62, the movement of the swivel shaft 31 can be reliably and quickly set in accordance with the rotation of the rotor 62.

[0036] Incidentally, if several stages of drive transmission mechanisms are interposed between the rotating shaft 31 and the rotating drive motor 6 serving as the drive source thereof, backlash or the like occurs between those drive transmission mechanisms. Therefore, in such a case, the setting angle of the circular saw blade body 5 is not necessarily set accurately, and the time required for the switching operation is much longer than that of the direct drive of the present invention. When rotating the rotating circular saw unit 1, the brake unit 8 is not activated at the start of rotation, of course. However, while the workpiece W is being cut, that is, while power is being supplied to the circular saw M, the brake unit 8 is activated to prevent the circular saw M from rotating. Also, the brake rotor 82 of this brake unit 8 is directly connected to the rotating shaft 31, and the braking operation is also performed extremely accurately. Furthermore, an encoder that detects such a rotating state detects the rotation of the brake rotor 82 of the brake unit 8 and accurately grasps the position, so that the rotating shaft 31 can be accurately positioned.

[0037] (3) Start of cutting After the circular saw blade body 5 is set to the initial cutting position in this way, the unit frame 2 is lowered by the rotation of the screw shaft 144 of the lift base 140 of the board processing machine 100, and the rotating circular saw blade body 5 cuts the workpiece W. During this cutting, cutting dust, or so-called chips, is generated from the board, which is the workpiece W. However, the chips are prevented from scattering around by the dust collection cover 51, and are discharged by suction from the dust collection duct 26 and the dust collection hose 26a connected thereto, preventing the deterioration of the working environment. Regarding the relationship between the dust collection duct 26 and the rotating cover 53 on the side of the circular saw blade body 5, the rotating cover 53 essentially forms the lower surface and inner surface of the annular dust collection duct 26, and the rotating cover 53 is allowed to rotate with respect to the fixed dust collection duct 26 in accordance with the rotation of the circular saw machine M.

[0038] (4) Changing the cutting direction In this way, after the first cutting operation by the circular saw blade main body 5, that is, the first straight cut, is performed, when a cutting operation is performed with a changed cutting direction, the circular saw M (circular saw blade main body 5) is temporarily lifted from the workpiece W. This operation is performed by driving the sub-lifting shift motor 143 of the lifting base 140, and by rotating the screw shaft 144, the unit base 21 is lifted together, so that the operating position (cutting position) of the circular saw blade main body 5 is raised from the workpiece W. Then, according to the program again, the turning drive motor 6 is driven to rotate (turn) the rotor 62 in a preset direction, and when the rotation is completed, the brake unit 8 is used to ensure a reliable stop, and the cutting position of the turning drive motor 6 with respect to the workpiece W is set (the cutting posture is fixed). In addition, with such a change in the cutting direction, the traveling frame 120 and the traverse base 130 are moved relative to each other as appropriate, and the circular saw M is moved in the desired XY direction. In this way, once the circular saw M is set to the next cutting position and cutting direction, the circular saw M is lowered and cutting (the next cutting) into the workpiece W is performed by the circular saw blade body 5. By repeating these operations as necessary, the workpiece W can be cut according to a preset program, and a material W1 cut into a desired shape from the workpiece W, such as a stepped formwork material as shown in Figure 1, can be obtained. [Explanation of symbols]

[0039] 1 Swivel circular saw unit 2 Unit Frame 3 Swivel frame 5 Circular saw blade body 6 Swing drive motor 7 Circular saw blade drive motor 8 Brake unit 9 Swing stopper W work W1 Cut out material M circular saw 21 Unit Base 22 Drive mount 23 Lifting mount 24 Sub-lift linear bearing 25 Female thread block 26 Dust collection duct 26a Dust collection hose 261 Seal flap 27 Protective cover 31 Swivel Axis 31a Cable guide hole 321 Radial Bearing 322 spacer collar 33 Flange 34 Lifting bracket 51 Dust collection cover 52 Chip discharge duct 53 Swivel cover 531 Seal flap 61 Stator 62 Rotor 71 Main casing 72 Output shaft 81 Brake stator 82 Brake rotor 91 Stopper shaft 92 Stopper rotor 93 Rotor body 94 Cover body 95 Base Body 931 Main body 932 Contact part 933 Angle supplement part 100 Board processing board 110 Work Table 111 Abutment frame 112 Side guide rail 113 Suction nozzle 114 Ruler 120 Running Frame 121 Leg frame 122 Upper Frame 123 Linear Bearing 124 Traverse rail 130 Traverse Base 131 Traverse Linear Bearing 132 Support plate 133 Main lift rail 134 Main lift shift motor 135 Screw shaft 140 Lifting Base 141 Main lift linear bearing 142 Secondary lift rail 143 Sub-lift shift motor 144 Screw shaft 150 Router Unit

Claims

1. A unit frame, a rotating frame that is rotatably provided on the unit frame; A circular saw unit including a circular saw blade body provided on the rotating frame, The rotating circular saw unit includes a rotating drive motor that rotates the rotating frame, and a circular saw blade drive motor that drives the circular saw blade body. A configuration in which a rotation center of the rotating frame coincides with an output center of a rotating drive motor, and a rotation center of the circular saw blade body coincides with an output center of a circular saw blade drive motor, Furthermore, the rotating center of the rotating frame is set to an allowable coincidence with the center of gravity of members including the rotating frame, the circular saw blade body, and the circular saw blade drive motor.

2. 2. The revolving circular saw unit according to claim 1, wherein the revolving drive motor is a torque motor, the stator being disposed in a unit frame, and the rotor being provided on a revolving shaft of a revolving frame.

3. The circular saw blade body includes a dust collection cover, 3. The revolving circular saw unit according to claim 1, wherein the dust collection cover is connected to a circular dust collection duct arranged above the dust collection cover, and the revolving drive motor is arranged in the inner space of the circular dust collection duct.

4. A board processing machine that performs the intended cutting process on a workpiece placed on a table by using a rotating circular saw unit, This board processing machine is A work table having a rectangular shape in a plan view; A travel frame is provided to span the work table in the width direction and is movable along the longitudinal direction of the work table; and a revolving circular saw unit supported on the traveling frame so as to be movable in the width direction and the up-down direction, A board processing machine equipped with a revolving circular saw unit, characterized in that the revolving circular saw unit according to any one of claims 1 to 3 is applied as the revolving circular saw unit.

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