JP2006346909A - Cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the damage or the like of the guide link of a cutter such as a portable circular saw or the like. <P>SOLUTION: The cutter is equipped with a housing 2 stored with a circular saw 1 and its drive part, the surface plate 4 arranged under the housing and connected to the front end of the housing in a revolvable manner through a pivot shaft 3 and a cutting depth adjusting device 5 permitting the revolution of the surface plate around the pivot shaft and regulating the protrusion quantity of the circular saw to the region under the surface plate. The cutting depth adjusting device 5 is equipped with the rigid guide link 17 connected to the rear end part of the surface plate through the support shaft 18 revolvable centering around the pivot pin 25b pivotally supported on the surface plate 4 to extend into the housing and fixing means 19 and 20 for fixing the guide link to the housing at a desired position in its length direction. Since the guide link is housed in the housing, the guide link does not become the obstruction of cutting work or the like in the cutting work or the like. Further, since the guide link is protected from the collision with external matter by the housing, the deformation or the like of the guide link is prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cutting machine such as a portable circular saw.

  A portable circular saw, which is a type of cutting machine, includes a housing that houses a circular saw blade, a motor, and the like, and a surface plate that is disposed at the lower portion of the housing and is rotatably connected to the front end of the housing via a pivot. . The housing is provided with a cover that covers substantially the upper half of the circular saw blade. Further, a cutting depth adjusting device is provided. That is, the surface plate is connected to the housing via the pivot, and an opening through which the circular saw blade penetrates to the bottom of the surface plate is formed at the center, and by adjusting the amount of rotation of the surface plate with the pivot as a fulcrum, The amount by which the circular saw blade projects from the opening to the bottom of the surface plate, that is, the depth of cut with respect to the workpiece, is adjusted.

  The cutting depth adjusting device includes a guide link that rises along the housing from the rear end of the surface plate, and a fixing unit that fixes the guide link to the housing. When the guide plate is fixed to the housing by the fixing means when the surface plate is rotated with respect to the housing by a desired angle, the circular saw blade protrudes the desired amount from the opening to the bottom of the surface plate. The size is set (see, for example, Patent Documents 1, 2, 3, 4, and 5).

  The portable circular saw is provided with a parallelism adjusting device for making the surface of the circular saw blade parallel to the side edges extending in the front-rear direction of the surface plate (see, for example, Patent Document 5). The parallelism is adjusted by operating the parallelism adjusting device when assembling the portable circular saw blade.

Japanese Utility Model Publication No. 44-8470 Japanese Utility Model Publication No. 44-27835 Japanese Utility Model Publication 4-27601 Japanese Patent No. 2829714 JP-A-9-174502

  In the depth-of-cut adjusting device, the guide link is provided outside the cover of the housing (see, for example, Patent Documents 1, 2, and 3), and the guide link is provided inside the cover (for example, Patent Document 4). , 5).

  When the guide link is provided outside the cover of the housing, the guide link is likely to obstruct the cutting operation during cutting work, etc., and the guide link is likely to be deformed or damaged by hitting other objects. There's a problem.

  Further, the guide link is provided along the inner side of the cover of the housing, the center of which is provided in front of the cover of the housing and formed in an arc shape along the outer periphery of the circular saw blade (for example, patent In References 4 and 5, the guide link pivot center is different from the center of the cover arc so that the guide link bends and pivots as the depth of cut is reduced. Therefore, it takes a lot of power to adjust the depth of cut, and the adjustment work becomes much troublesome. Further, since the guide link is intentionally bent and has low rigidity, the guide link is deformed during the cutting operation, and the positional relationship between the housing and the surface plate is likely to be displaced, and the processing accuracy is likely to be lowered.

  Therefore, an object of this invention is to provide the cutting machine which can eliminate the said malfunction.

  In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a housing (2) that houses a circular saw blade (1) and its drive unit, and a front end of the housing (2) that is disposed below the housing (2). The surface plate (4) that is pivotably connected to the base plate (3) and the surface plate (4) with the pivot shaft (3) as a fulcrum are allowed to rotate, and the bottom plate (4) In a cutting machine having a cutting depth adjusting device (5) for adjusting the protruding amount of the saw blade (1), the cutting depth adjusting device (5) is disposed at the rear end of the surface plate (4). A rigid guide link that is connected to the surface plate (4) via a support shaft (18) that is pivotable about a pivot pin (25b) that is pivotally supported and extends into the housing (2). (17) and fixing means (19, 20) for fixing the guide link (17) to the housing (2) at a desired position in the length direction thereof To adopt a cutting machine equipped with.

  The invention according to claim 2 is the cutting machine according to claim 1, wherein a gap is formed between the surface of the circular saw blade (1) and the tip of the motor shaft (6a), and the gap is formed in the gap. A cutting machine in which the guide link (17) is inserted is adopted.

  The invention according to claim 3 is the cutting machine according to claim 1 or 2, wherein the parallelism adjusting device (29) is provided at a location where the guide link (17) is connected to the surface plate (4). Adopted cutting machine.

  According to a fourth aspect of the present invention, in the cutting machine according to the third aspect, the parallelism adjusting device (29) is configured such that the rear end portion of the guide link (17) is supported on the support shaft (18). A cutting machine configured so that the parallelism of the circular saw blade (1) can be obtained by being movable in the axial direction of 18) and stopping at a desired position on the support shaft (18) is adopted.

  According to the first aspect of the present invention, the guide link (17) is connected via the support shaft (18) pivotable about the pivot pin (25b) pivotally supported on the surface plate (4), and the housing Since it is housed inside (2), the guide link (17) does not interfere with the cutting operation or the like in the cutting operation or the like, and is protected from collision with an external object by the housing (2). The deformation of the link (17) is prevented. Further, since the guide link (17) is provided with rigidity and is not easily deformed, the depth of cut can be adjusted easily and smoothly. Further, since the guide link (17) has rigidity, it is difficult to be deformed during the cutting operation, and therefore, the cutting process with high accuracy is performed without causing a shift in the positional relationship between the housing (2) and the surface plate (4). be able to.

  According to the invention of claim 2, the turning range of the guide link (17) in the housing (2) extends in the direction of the saw blade shaft (1a), and the depth of cut is increased without increasing the housing (2). The adjustment range can be expanded.

  According to the third aspect of the present invention, in combination with the rigidity of the guide link (17), the surface of the circular saw blade can be easily made parallel to the edge of the surface plate, thereby further improving the machining accuracy. Can be increased.

  According to the fourth aspect of the present invention, the circular saw blade (1) can be easily obtained by changing the position of the rear end of the guide link (17) with respect to the support shaft (18) in the axial direction of the support shaft (18). The degree of parallelism can be adjusted.

  The best mode for carrying out the invention will be described below with reference to the drawings.

<Embodiment 1>
As shown in FIGS. 1 to 8, a portable circular saw, which is a kind of this cutting machine, is disposed below the housing 2, a housing 2 that houses the circular saw blade 1 and its drive unit, and the front end of the housing 2. A surface plate 4 that is pivotally connected to the shaft 3 and a surface plate 4 that uses the pivot 3 as a fulcrum, and that allows the circular saw blade 1 to project below the surface plate 4. And a penetration depth adjusting device 5.

  As shown in FIGS. 1 to 7, the housing 2 includes a motor case 2 a that houses the motor 6 of the drive unit, a gear box 2 b that houses the power transmission gear train 7 of the drive unit, and a substantially upper half of the circular saw blade 1. A cover 2c and the like for covering are integrally provided.

  As shown in FIG. 7, the motor case 2a extends in the left-right direction of the portable circular saw, and the motor 6 is horizontally placed therein. A fan 8 is fixed to the motor shaft 6a, and a casing 9 covering the fan 8 is inserted and fixed in the cavity of the motor case 2a. The gear box 2b is applied to the left end of the motor case 2a in the drawing and is fixed to the motor case 2a with screws or the like. Both ends of the motor shaft 6a are supported on the right end of the gear box 2b and the right end of the motor case 2a via bearings 10 and 11, respectively. A start gear 7a is provided at the left end of the motor shaft 6a, and this start gear 7a is inserted into the gear box 2b. The bottom portion of the gear box 2b is disposed at a position lower than the bottom portion of the motor case 2a, and the saw blade shaft 1a of the circular saw blade 1 is supported through the bearing 12 there. Thereby, the substantially lower half of the circular saw blade 1 protrudes downward from the lower end of the housing 2. A terminal gear 7b is fixed at a position where the saw blade shaft 1a enters the gear box 2b. The gear box 2b houses intermediate gears 7c and 7d that connect the start gear 7a and the end gear 7b. The intermediate gears 7c and 7d are fixed on the same axis. The cover 2c is curved along the outer periphery of the circular saw blade 1, and is divided in the left-right direction of the portable circular saw. The right half of the cover 2c is formed integrally with the gear box 2b so as to be continuous with the gear box 2b, and the left half is fixed to the right half with screws or the like. As shown in FIG. 2, a chip discharge port 13 is formed in the left half.

  Further, as shown in FIGS. 2 and 7, a handle 14 for operating the portable circular saw is fixed to the upper part of the motor case 2 a of the housing 2. The handle 14 is provided with a switch lever 15 for turning on and off the rotation of the circular saw blade 1 of the portable circular saw. The left end of the gear box 2b on which the saw blade shaft 1a of the circular saw blade 1 is supported is formed as a cylindrical shaft, and a safety cover 16 covering the lower half of the circular saw blade 1 is rotatably supported on the cylindrical shaft. When cutting the workpiece W, the safety cover 16 is pushed by the workpiece W and turns around into the cover 2c with the cylindrical shaft as a fulcrum.

  As shown in FIGS. 1 to 8, the surface plate 4 is disposed below the housing 2 so as to extend in the front-rear direction of the portable circular saw. A smooth abutting surface to be applied to the workpiece W is formed on the lower surface of the surface plate 4, and an opening 4a through which the circular saw blade 1, the safety cover 16 and the like can pass is formed at the center.

  As shown in FIGS. 1, 6, and 8, the surface plate 4 is connected to the housing 2 via a cut depth adjusting device 5. Specifically, the surface plate 4 is rotatably connected to the front end of the cover 2 c in the housing 2 via the pivot 3. The guide link 17 is connected to the rear end portion of the surface plate 4 via a support shaft 18 that is pivotable about a pivot pin 25b that is pivotally supported on the surface plate 4, and extends into the housing 2 to be fixed. The desired position in the length direction of the guide link 17 is fixed to the housing 2 by the means.

  Since the pivot 3 extends in the left-right direction of the portable circular saw, the surface plate 4 can be rotated as it contacts and separates from the lower portion of the housing 2 with the pivot 3 as a fulcrum, as shown in FIGS. With this rotation, the amount by which the circular saw blade 1 protrudes below the surface plate 4 changes, and therefore the depth of cut with respect to the workpiece W changes.

  As shown in FIGS. 6 to 8, the guide link 17 is a lever that is curved with the same degree of curvature as the outer peripheral edge of the circular saw blade 1, and penetrates the portable circular saw in the lateral direction along its length. Thus, a guide groove 17a is formed. Further, the guide link 17 is made of an aluminum die-cast material or the like, and is given an appropriate rigidity so as not to be easily deformed even if the weight of the housing 2 is applied.

  As shown in FIG. 1, the fixing means is specifically a bolt 19 and a nut 20, and the bolt 19 covers the hole 21 formed in the cover 2c so as to penetrate the portable circular saw in the left-right direction. The bolt 19 is screwed into a nut 20 attached to the guide link 17. As shown in FIGS. 6 to 8, the nut 20 can slide in a non-rotating state in a shallow groove 17 b formed in the guide link 17 so as to surround the guide groove 17 a. As shown in FIGS. 1 and 3, an operation lever 19 a is fixed to the head of the bolt 19. After operating the operation lever 19a and loosening the bolt 19 and the nut 20, the surface plate 4 is rotated as if it contacts and separates from the lower portion of the housing 2 with the pivot 3 as a fulcrum, as shown in FIGS. Then, the guide link 17 rotates up and down within the cover 2c with the support shaft 18 as a fulcrum. Then, by tightening the bolt 19 and the nut 20 at a desired position on the guide link 17, the positional relationship between the cover 2c and the surface plate 4 is fixed, and the amount by which the circular saw blade 1 protrudes below the surface plate 4 is fixed. The

  As shown in FIGS. 6 and 7, when the intermediate gears 7c and 7d of the transmission gear train 7 are housed between the motor shaft 7a and the saw blade shaft 1a in the drive unit, the circular saw blade 1 and the motor shaft 6a are accommodated. A gap is formed between the guide link 17 and the guide link 17. That is, the terminal gear 7b is disposed below the starting end gear 7a of the drive unit, and intermediate gears 7c and 7d overlapped in a plurality of stages are interposed between the starting end gear 7a and the terminal gear 7b. On the upper side of the gear box 2b formed so as to follow the outline of the row 7, a gap that allows the guide link 17 to incline to the vicinity of the motor shaft 6a is formed. As a result, as shown in FIGS. 6 and 8, the rotation range of the guide link 17 in the housing 2 extends in the direction of the saw blade shaft 1a, and the adjustment range of the cutting depth can be increased without increasing the size of the housing 2. Expanding.

  As shown in FIGS. 1 to 6 and FIG. 8, the surface plate 4 is connected to the front and rear portions of the housing 2 via an inclination angle adjusting device 22.

  The inclination angle adjusting device 22 is for forming an oblique cut surface on the workpiece W by inclining the circular saw blade 1 with respect to the surface plate 4, and stands up from the upper surfaces of the front and rear portions of the surface plate 4. Brackets 23a and 23b, supporters 24a attached to the front and rear ends of the cover 2c via the pivot 3, and the support shaft 18 that engages the guide link 17 and the boss 17c that is the rear end of the guide link 17, respectively. A supporter 24b attached via the brackets, pivot pins 25a and 25b pivotally supporting the supporters 24a and 24b on the brackets 23a and 23b, and fastening means for fastening the supporters 24a and 24b to the brackets 23a and 23b, respectively. It comprises. Note that the support shaft 18 is rotatably spanned between two standing walls 24c provided on the supporter 24b.

  Each bracket 23a, 23b extends on the surface plate 4 in the left-right direction, and each supporter 24a, 24b also extends in the left-right direction. The supporters 24a, 24b are arranged around the pivot pins 25a, 25b. It abuts on the side surface of 23b so as to be rotatable. The pivot pins 25a and 25b for pivotally supporting the supporters 24a and 24b on the brackets 23a and 23b are arranged on the same straight line extending in the front-rear direction of the surface plate 4, and are indicated by a two-dot chain line in FIGS. Thus, the surface plate 4 is inclined with respect to the housing 2 with the pivot pins 25 a and 25 b as fulcrums. As shown in FIGS. 4 and 5, the brackets 23a and 23b are formed with arc grooves 26 that are curved around the pivot pins 25a and 25b. The fastening means is specifically a fastening screw 27 with a knob, and the fastening screw 27 penetrates the arc grooves 26 of the brackets 23a and 23b toward the supporters 24a and 24b, and is screwed into the supporters 24a and 24b. Thus, when the tightening screw 27 is tightened when the surface plate 4 is inclined by a desired angle, the surface plate 4 is fixed to the housing 2 at this angular position. When the surface plate 4 is applied to the workpiece W to perform a cutting operation, a cut surface having an inclination angle corresponding to the angular relationship between the circular saw blade 1 and the surface plate 4 is formed on the workpiece W.

  As shown in FIGS. 1 and 3, one end of each of the supporters 24 a and 24 b extends along the upper surface of the surface plate 4, and the perpendicularity adjusting screw 28 is screwed to the surface plate 4 immediately below the one end. By turning the squareness adjusting screw 28 with a tool, the inclination angle of each supporter 24a, 24b with respect to the surface plate 4 can be finely adjusted, and the circular saw blade 1 can be set perpendicular to the surface plate 4.

  As shown in FIG. 1, a parallelism adjusting device 29 is provided at a location where the guide link 17 is connected to the surface plate 4. The parallelism adjusting device 29 is for making the surface of the circular saw blade 1 parallel to the end edge 4b extending in the front-rear direction of the surface plate 4, and the boss 17c, which is the rear end portion of the guide link 17, is connected to the above-described fixed surface. A desired position on the support shaft 18 can be moved in the axial direction of the support shaft 18 on the support shaft 18 that is rotatably mounted on the supporter 24b that is provided on the board 4 so as to be rotatable about the pivot pin 25b. It is comprised so that the parallelism of the circular saw blade 1 can be obtained by stopping by. Specifically, the boss 17c of the guide link 17 is slid by a desired amount in the axial direction of the support shaft 18 with respect to the support shaft 18, and then the guide link 17 is desired by tightening the fixing screw 30 screwed into the boss 17c. It is designed to be fixed in position. In order to adjust the parallelism of the circular saw blade 1, the fixing screw 30 is loosened, the boss 17c of the guide link 17 is slid a minute distance on the support shaft 18, and the housing 2 is moved together with the guide link 17 in the horizontal direction of the portable circular saw. The surface of the circular saw blade 1 in the housing 2 is made parallel to the edge 4 b of the surface plate 4. Thereafter, the fixing screw 30 is tightened with respect to the support shaft 18 to fix the guide link 17 to the support shaft 18 to maintain parallelism.

  Next, the operation of the portable circular saw having the above configuration will be described.

  When the operator pushes the switch lever 15 shown in FIGS. 2 and 3, the motor 6 is activated and the circular saw blade 1 rotates at high speed in the arrow direction a in FIG. 2. When the worker holds the handle 14 and supports the portable circular saw and slides the surface plate 4 forward against the work W, the safety cover 16 is pushed by the work W and turns into the cover 2c. It is cut by the circular saw blade 1.

  In this portable circular saw, since the guide link 17 is housed inside the housing 2, the guide link 17 does not obstruct the cutting operation or the like in the cutting operation. The guide link 17 is protected from collision with an external object by the housing 2.

  In order to adjust the cutting depth for the workpiece W, the cutting depth adjusting device 5 is operated.

  That is, after turning the loosening direction with the operation lever 19a of the bolt 19 shown in FIG. 1, the surface plate 4 is rotated with respect to the housing 2 with the pivot 3 as a fulcrum, and the circular saw blade 1 is located below the surface plate 4. Adjust the amount of protrusion. Along with this, the bolt 19 slides relatively in the guide groove 17a of the guide link 17, and the guide link 17 is inclined with the support shaft 18 as a fulcrum. When the projecting amount of the circular saw blade 1 reaches a desired size, when the bolt 19 and the nut 20 are tightened, the surface plate 4 is fixed to the housing 2 via the guide link 17 at a desired angular position. Therefore, when the circular saw blade 1 rotating on the workpiece W is applied by the same operation as described above, the workpiece W can be cut at a desired cutting depth. As shown in FIG. 6, when the bolt 19 slides in the guide groove 17 a of the guide link 17 to the end on the support shaft 18 side, the protruding amount of the circular saw blade 1 becomes the maximum, and the guide link 17 moves inside the cover 2. The motor shaft 6a is inclined to the vicinity of the starting end gear 7a at the tip. Further, as shown in FIG. 8, when the bolt 19 is slid in the guide groove 17a of the guide link 17 to the end opposite to the support shaft 18, the protruding amount of the circular saw blade 1 below the surface plate 4 becomes zero. Become.

  Here, since the guide link 17 is provided with rigidity and is not easily deformed, the depth of cut can be adjusted easily and smoothly. In addition, the guide link 17 is not easily deformed during the cutting operation, and therefore, accurate cutting can be performed without causing a deviation in the positional relationship between the housing 2 and the surface plate 4.

  In order to form the cut surface of the workpiece W obliquely, the tilt angle adjusting device 22 is operated.

  That is, when the tightening screw 27 is loosened and the surface plate 4 is tilted by a desired angle along the arc grooves 26 of the brackets 23a and 23b with the pivot pins 25a and 25b as fulcrums, the tightening screw 27 is tightened again. As shown by a two-dot chain line in FIG. 5, the surface plate 4 is fixed to the housing 2 at this angular position. When the surface plate 4 is applied to the workpiece W to perform a cutting operation, a cut surface having an inclination angle corresponding to the angular relationship between the circular saw blade 1 and the surface plate 4 is formed on the workpiece W.

  In order to make the surface of the circular saw blade 1 parallel to the edge 4b extending in the front-rear direction of the surface plate 4, the parallelism adjusting device 29 is operated.

  That is, the boss 17c of the guide link 17 is slid by a minute distance on the support shaft 18, and the housing 2 together with the guide link 17 is inclined by a minute angle in the left-right direction of the surface plate 4. When the disk surface of the circular saw blade 1 in the housing 2 is parallel to the edge 4b of the surface plate 4, when the fixing screw 30 is tightened with respect to the support shaft 18, this parallelism is maintained. This adjustment of parallelism is usually performed when assembling a portable circular saw.

<Embodiment 2>
As shown in FIG. 9, in the second embodiment, a parallelism adjusting device 31 having a configuration different from that in the first embodiment is provided.

  In the parallelism adjusting device 31, the supporter 24 b in the first embodiment is omitted, and the support shaft 18 that passes through the boss 17 c of the guide link 17 intersects the pivot pin 25 b of the inclination angle adjusting device 22. The support shaft 18 is rotatably held by the boss 17c, and a male screw 32 is formed at a location intersecting the pivot pin 25b. The male screw 32 is screwed into a female screw 33 formed on the pivot pin 25b. When the support shaft 18 is rotated on the boss 17c of the guide link 17, the guide link 17 moves on the support shaft 18 in the axial direction of the support shaft 18, and the housing 2 together with the guide link 17 is inclined at a slight angle in the left-right direction. As a result, the surface of the circular saw blade 1 in the housing 2 is parallel to the edge 4 b of the surface plate 4.

  In FIG. 9, the same parts as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

<Embodiment 3>
As shown in FIG. 10, in the third embodiment, a parallelism adjusting device 34 having a configuration different from that in the first embodiment is provided.

  In this parallelism adjusting device 34, the fixing screw 30 in the first embodiment is omitted, and the axial position of the guide link 17 with respect to the support shaft 18 depends on the thickness and number of washers 35a and 35b attached to the support shaft 18. Adjusted. When the boss 17c of the guide link 17 is slid on the support shaft 18 by changing the thickness and the number of washers 35a and 35b, the housing 2 is tilted by a small angle in the left-right direction together with the guide link 17, thereby The surface of the circular saw blade 1 is parallel to the edge 4 b of the surface plate 4.

In FIG. 10, the same parts as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
<Embodiment 4>
As shown in FIG. 11, in the fourth embodiment, a parallelism adjusting device 36 having a configuration different from that in the first embodiment is provided.

  In this parallelism adjusting device 36, a male screw 37 is formed on the support shaft 18 in the first embodiment, and a female screw 38 into which the male screw 37 is screwed is formed on the boss 17 c of the guide link 17. When the support shaft 18 is turned, the boss 17c of the guide link 17 slides on the support shaft 18, and the housing 2 together with the guide link 17 is inclined at a slight angle in the left-right direction, whereby the surface of the circular saw blade 1 in the housing 2 is moved. It becomes parallel to the edge 4 b of the surface plate 4.

  In FIG. 11, the same parts as those of the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

It is a partial notch top view of the cutting machine which concerns on Embodiment 1 of this invention. It is a front view of the cutting machine shown in FIG. It is a rear view of the cutting machine shown in FIG. It is a right view of the cutting machine shown in FIG. It is a left view of the cutting machine shown in FIG. It is a front view which removes a part of cover in a housing and shows the cutting machine shown in FIG. It is a longitudinal cross-sectional view of the cutting machine shown in FIG. It is a front view shown in the state which made the cutting depth zero in the cutting machine shown in FIG. It is a partial notch top view of the cutting machine concerning Embodiment 2 of this invention. It is a partial notch top view of the cutting machine which concerns on Embodiment 3 of this invention. It is a partial notch top view of the cutting machine which concerns on Embodiment 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Circular saw blade 1a ... Saw blade axis | shaft 2 ... Housing 3 ... Pivot 4 ... Surface plate 5 ... Cutting depth adjusting device 6a ... Motor shaft 7 ... Gear train 7c, 7d ... Intermediate gear 17 ... Guide link 18 ... Support shaft 19 ... Bolt
20 ... Nut 24b ... Supporter 25b ... Pivot pin 29 ... Parallelity adjusting device

Claims (4)

  A housing that accommodates the circular saw blade and its drive, a surface plate that is arranged below the housing and is connected to the front end of the housing via a pivot, and allows rotation of the surface plate with the pivot as a fulcrum. And a cutting depth adjusting device that adjusts the amount of protrusion of the circular saw blade below the surface plate, the cutting depth adjusting device at the rear end of the surface plate, A rigid guide link that extends into the housing and is connected to the housing at a desired position in the length direction by being connected via a pivot that can pivot about a pivot pin that pivots on the surface plate. A cutting machine comprising fixing means for performing   2. The cutting machine according to claim 1, wherein a gap is formed between the surface of the circular saw blade and the tip of the motor shaft, and the guide link enters the gap.   The cutting machine according to claim 1 or 2, wherein a parallelism adjusting device is provided at a location where the guide link is connected to a surface plate.   4. The cutting machine according to claim 3, wherein the parallelism adjusting device enables the rear end portion of the guide link to move in the axial direction of the support shaft on the support shaft and stops at a desired position on the support shaft. A cutting machine configured to obtain the parallelism of a saw blade.

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