JP2008114392A - Portable electric cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable electric cutter which adopts a mechanism for correcting a housing inclined by a component processing error, an assembling error or the like to be in parallel with the side edge extending in the fore-and-aft direction of a surface plate, thus preventing the deterioration of processing accuracy, and is favorable in operability. <P>SOLUTION: In the portable electric cutter having a notch depth adjusting mechanism (5), contact parts (24d and 28) for making a guide link (17) erected rectangularly with respect to the surface plate (4) are arranged between the surface plate (4) and the guide link (17). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

  2. Description of the Related Art A portable electric circular saw, which is a type of conventional portable electric cutting machine, includes a housing including a motor case that houses a motor, a gear case that houses a plurality of gears, and a saw blade cover that houses a saw blade, and a housing And a surface plate connected to be pivotable through a pivot. In addition, an opening through which the saw blade penetrates to the lower side of the surface plate is formed at a substantially central portion of the surface plate. By adjusting the amount of rotation of the surface plate with the pivot as a fulcrum, the saw blade can be moved from the opening to the surface plate. A cutting depth adjusting mechanism is provided for adjusting the amount protruding downward, that is, the cutting depth for the material to be cut.

  The cutting depth adjusting mechanism fixes the guide link that stands up from the rear end of the surface plate along the saw blade cover that forms part of the housing, and the guide link is fixed to the saw blade cover that forms part of the housing. Fixing means. When the guide link is fixed to the housing by the fixing means when the surface plate is rotated by a desired angle, the saw blade protrudes from the opening to the lower side of the surface plate, and thereby the depth of cut with respect to the workpiece is desired. (See, for example, Patent Documents 1 and 2).

JP 61-98501 A No. 8-8801

  As shown in FIGS. 7 to 9, the conventional cutting depth adjusting mechanism is configured such that a surface plate 400 is rotatably connected to a front end portion of a saw blade cover 200 </ b> C constituting a part of the housing 200 via a pivot 300. The guide link 170 and the housing 200 are fixed by fixing means. Usually, the housing 200 is fixed to the guide link 170 on the assumption that the side surface of the saw blade 100 is parallel to the side edge 400 b of the surface plate 400. However, the housing 200 may be inclined and attached to the side edge 400b extending in the front-rear direction of the surface plate 400 due to a dimensional error during processing of each member, an error during assembly, or the like (in FIG. The inclination is represented as the inclination (Θ1) of the saw blade 100.) When the guide link 170 is not fixed to the surface plate 400 in the state in which the housing 200 is inclined as described above, the guide link 170 is attracted to the inclination of the housing 200 as shown in FIGS. And the saw blade 100 is not parallel to the side edge 400b extending in the front-rear direction of the surface plate, and the material to be cut is cut by shifting in either the left or right direction of the cutting direction, There is a problem that the processing accuracy is lowered, and a force for twisting the hand holding the housing 200 to the left and right acts to lower the operability. In addition, even when the housing 200 is parallel to the side edge 400b of the surface plate 400, when a force pressing the housing 200 downward is applied via the handle 140, the housing 200 and the guide link 170 are inclined about the pivot pin 250b ( Θ3), and there is a problem that processing accuracy is lowered.

  Therefore, the present invention can correct a housing inclined due to part processing error, assembly error, etc. so that it is parallel to the side edge extending in the front-rear direction of the surface plate, and the force pressing the housing downward works. Even in such a case, it is an object of the present invention to provide a portable electric cutting machine that adopts a configuration in which the housing does not tilt and does not deteriorate the machining accuracy and has good operability.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a housing (2) that houses a motor (6) and a saw blade (1), and is disposed below the housing (2). A saw blade (1) centering on a surface plate (4) rotatably connected to the front end of the surface plate via a pivot (3) and a pivot pin (25b) pivoted to the rear end of the surface plate (4) The guide link (17) is connected to the surface plate (4) so as to be able to rotate at right angles to the side surface of the housing (2) and slidably contacts the housing (2), and the guide link (17) and the housing (2) are fixed. In a portable electric cutting machine having a cutting depth adjusting mechanism (5) comprising means (19, 19a, 20), a contact portion for allowing the guide link (17) to stand perpendicular to the surface plate (4) (24d, 28) is provided between the surface plate (4) and the guide link (17). It provides a portable electric cutting machine.

  The invention according to claim 2 is the portable electric cutting machine according to claim 1, wherein the housing (2) houses the saw blade (1) and has a surface parallel to the side surface of the saw blade (1). The guide link (17) comprises a saw blade cover (2c), and the guide link (17) is in sliding contact with a surface parallel to the side surface of the saw blade (1) in the saw blade cover (2c), and the rear end portion (17c) is a surface plate. (4) Connected via a support shaft (18) to a support member (24b) that is rotatable at a right angle to the surface plate (4) around a pivot pin (25b) that is fixed to the rear end portion. A portable electric cutting machine is provided.

  The invention according to claim 3 is the portable electric cutting machine according to claim 1 or 2, wherein either one of the abutment portions (24d, 28) of the surface plate (4) or the guide link (17) is provided. A portable electric cutting machine is provided that has a protruding portion and the protruding amount of the protruding portion can be adjusted.

  According to the first aspect of the present invention, in the portable electric cutting machine having the cut depth adjusting mechanism, the contact portion for the guide link to stand at right angles to the surface plate is provided between the surface plate and the guide link. Even if the housing is inclined with respect to the surface plate due to dimensional errors or assembly errors of the parts, the guide link always stands up at a right angle to the surface plate, and the housing guides when the housing and the guide link are fixed by the fixing means. Even if a force that pushes the housing downward is applied, the housing tilts close to the link, the inclination of the housing is corrected by the guide link, and the side surface of the saw blade housed in the housing is parallel to the side edge of the surface plate. Since there is no inclination, it is possible to provide a portable electric cutting machine with good operability without lowering the processing accuracy.

  According to the second aspect of the present invention, the housing includes a saw blade cover that accommodates the saw blade and has a surface parallel to the side surface of the saw blade, and the guide link is in the saw blade cover and parallel to the side surface of the saw blade. Since it is slidably contacted with the surface and is connected via a support shaft to a support member that can rotate at right angles to the surface plate around a pivot pin that pivots the rear end portion to the rear end portion of the surface plate, A contact portion for making a right angle with respect to the surface plate of the guide link can be provided at a position farther from the pivot pin, and the size setting of the contact portion for determining the right angle becomes easy.

  According to the third aspect of the present invention, since the abutment portion of either the surface plate or the guide link is a projecting portion and the projecting amount of the projecting portion can be adjusted, the guide link can be perpendicular to the surface plate. Can be finely adjusted.

  As shown in FIGS. 1 to 6, a portable electric circular saw, which is a kind of this portable electric cutting machine, is disposed below the housing 2 with a housing 2 housing the saw blade 1 and its drive unit. The surface plate 4 that is rotatably connected to the front end portion 2 via the pivot 3 and the turn of the surface plate 4 that uses the pivot 3 as a fulcrum are permitted, and the amount of projection of the saw blade 1 below the surface plate 4 is allowed. And a cut depth adjusting mechanism 5 for adjusting the depth.

  The housing 2 includes a motor case 2a that houses a motor 6, a gear case 2b that houses a power transmission gear train (not shown) that transmits power from the motor 6, and a saw blade 1 formed on the right end of the gear case 2b. A stored saw blade cover 2c is provided.

  The motor case 2a extends in the left-right direction of the portable electric circular saw, and the motor 6 is placed horizontally in the motor case 2a. A start gear (not shown) is formed at the tip of the motor shaft 6a, and is linked to a power transmission gear train.

  A handle 14 for operating a portable electric circular saw is formed on the upper part of the motor case 2a of the housing 2. The handle 14 is provided with a switch lever 15 for starting or stopping the portable electric circular saw. A safety cover 16 covering the lower half of the saw blade 1 is supported at the right end of the gear case 2b on which the saw blade shaft 1a of the saw blade 1 is supported. Has been. When the material to be cut is cut, the safety cover 16 is pushed by the material to be cut and stored in the saw blade cover 2c.

  The surface plate 4 is below the housing 2, extends in the front-rear direction of the portable electric circular saw, and is formed in a rectangular shape in plan view. The right side edge 4b of the rectangular base plate 4 forming the right long side of this rectangle is arranged in parallel with the side surface of the saw blade 1, and this kind of portable electric circular saw is used as a workpiece W using a ruler. It has a function as a guide surface along the ruler when cutting. Further, an opening 4a extending in the front-rear direction along the side edge 4b is formed at a position slightly shifted from the center position in the left-right direction of the surface plate 4 to the right side edge 4b, and the saw blade 1 and the safety cover 16 are provided. It can protrude downward. The surface plate 4 has a sliding surface 4c that slides on the workpiece W on the surface opposite to the housing 2 side.

  The surface plate 4 is connected to the housing 2 via a cut depth adjusting mechanism 5. Specifically, a bracket 23a stands upright in the left-right direction perpendicular to the sliding surface 4c of the surface plate 4 on the upper surface of the front end portion of the surface plate 4, and the supporter is centered on a pivot pin 25a that is fixed to the bracket 23a. 24a is pivotally supported so as to be rotatable at right angles to the sliding surface 4c of the surface plate 4. A pivot 3 is pivotally supported by the supporter 24a in parallel with the sliding surface 4c of the surface plate 4 and in parallel with the bracket 23a. The surface plate 4 is connected to the front end portion of the saw blade cover 2c of the housing 2 via the pivot 3 so as to be rotatable in the vertical direction.

  On the other hand, on the upper surface of the rear end portion of the surface plate 4, the bracket 23 b stands upright in the left-right direction perpendicular to the sliding surface 4 c in contact with the workpiece W of the surface plate 4. A pivot pin 25b is pivoted on the bracket 23b, and a supporter 24b as a support member is pivotally supported around the pivot pin 25b so as to be rotatable along the side surface of the bracket 23b. The supporter 24b as a support member is pivotally supported by the surface plate 4 so as to be able to rotate at right angles with respect to the sliding surface 4c in contact with the workpiece W of the surface plate 4, in particular.

  As shown by a two-dot chain line in FIG. 4, the surface plate 4 can be tilted with respect to the housing 2 about the pivot pins 25a and 25b via the supporters 24a and 24b, and is fixed by a fastening screw 27 with a knob. It is fixed to the housing 2 at an inclination angle of.

  As shown in FIG. 1, a pair of upright walls 24c stands on a supporter 24b pivotally supported around a pivot pin 25b at the rear end of the surface plate 4, and is supported between the upright walls 24c. A shaft 18 is stretched around the shaft so as to be rotatable. A hole formed in the rear end portion 17 c of the guide link 17 is fitted to the support shaft 18, and the support shaft 18 and the guide link 17 are fixed and connected by a fixing screw 30. The guide link 17 is integrated with the supporter 24 b via the support shaft 18 and is rotatable with respect to the surface plate 4 about the support shaft 18.

  A certain amount of gap is provided between the rear end portion 17c of the guide link 17 and the pair of standing walls 24c. When the fixing screw 30 is loosened, the guide link 17 can move along the axis of the support shaft 18 by a gap. With this configuration, when the guide link 17 and the housing 2 are fixed by fixing means described later, and the housing 2 is not parallel to the side edge 4 b of the surface plate 4, the guide link 17 is moved along the support shaft 18. It can be corrected in parallel by moving it.

  Further, as shown in FIGS. 1 and 4, the supporter 24b of the present embodiment is formed to extend in the left direction in the drawing along the bracket 23b with the pivot pin 25b as a reference, and the tip 24d is further narrowed. The contact portion of the present invention is configured. Further, the guide link 17 is also provided at a position left to the left in FIG. 1 from the pivot pin 25b that pivotally supports the supporter 24b.

  An adjustment screw 28 penetrates upward from the sliding surface 4c side of the surface plate 4 at a position facing the front end portion 24d of the supporter 24b of the surface plate 4, and is screwed so as to freely advance and retract. And the front-end | tip of the adjustment screw 28 contact | abuts to the front-end | tip part 24d of the supporter 24b, and comprises the contact part. With this contact, the guide link 17 stands upright at a right angle with respect to the surface plate 4 via the supporter 24b when the portable electric circular saw shown in FIG. 1 is viewed from the rear.

  As described above, the guide link 17 according to the present invention can stand upright at a right angle by abutting against the surface plate 4, and the position where the guide link 17 abuts against the surface plate 4 is fixed to the surface plate 4 via the supporter 24b. Since it can be provided at a position further away from the pivot pin 25b, it is easy to stand up at a right angle without finely adjusting the size of the contact portion. Further, since the abutting portion of the surface plate 4 is an adjustment screw 28 that can freely advance and retract, fine adjustment for raising the guide link 17 at a right angle can be easily performed.

  As shown in FIGS. 1, 5, and 6, the guide link 17 whose rear end portion 17 c is pivotally supported by the support shaft 18 is located between the saw blade cover 2 c and the saw blade 1, and rotates the support shaft 18. The shaft can be turned up and down while standing at right angles to the sliding surface 4c of the surface plate 4 as an axis, and is provided to extend forward in the saw blade cover 2c in contact with the inner side surface of the saw blade cover 2c. It has been. The inner side surface of the saw blade cover 2 c is formed in parallel to the surface of the saw blade 1. The guide link 17 is fixed to the saw blade cover 2 c by a fixing means at a desired position in the length direction, and is fixed to the housing 2.

  Further, as shown in FIGS. 5 and 6, the guide link 17 is a lever that is curved with a curvature slightly larger than the outer peripheral edge of the saw blade 1, and is a guide groove that penetrates toward the inner side surface of the saw blade cover 2c. 17a is formed extending in the length direction. Further, the material of the guide link 17 is made of an aluminum alloy or the like, and has an appropriate rigidity so that the guide link 17 is not easily deformed not only by the weight of the housing 2 but also by an operator's force to operate the portable electric circular saw. Is given.

  As shown in FIG. 1, the fixing means is specifically composed of a bolt 19, a nut 20 and an operation lever 19a fixed to the head of the bolt 19, and the side surface of the saw blade cover 2c in the horizontal direction in the figure. Bolts 19 penetrate the inside of the saw blade cover 2 c through the through holes 21, and the bolts 19 are screwed into nuts 20 attached to the guide links 17.

  As shown in FIGS. 5 and 6, the nut 20 can slide in a non-rotating state in a shallow groove 17 b formed so as to surround the guide groove 17 a of the guide link 17. When the operating lever 19a is operated to loosen the bolt 19 and the nut 20 and then the base plate 4 is rotated with the pivot 3 as a fulcrum so as to contact and separate from the lower portion of the housing 2, the guide link 17 is pivoted. 18 is pivoted up and down within the saw blade cover 2c. Then, by tightening the bolt 19 and the nut 20 at a desired position on the guide link 17, the positional relationship between the saw blade cover 2 c, that is, the housing 2 and the surface plate 4 is fixed, and the slide of the surface plate 4 of the saw blade 1 is fixed. The downward protrusion from the moving surface 4c is fixed. Further, as shown in FIG. 5, in the state where the cutting depth is maximized, the rear end portion 2e of the saw blade cover 2c and the rear end portion 17c of the guide link 17 come into contact with each other.

  Next, the operation of the cutting depth adjusting mechanism of the portable electric circular saw having the above configuration will be described.

  In order to set the cutting depth, first, the operation lever 19a of the fixing means shown in FIG. 1 is turned in the loosening direction, and the fixing of the saw blade cover 2c and the guide link 17 is released. Next, the surface plate 4 is rotated around the pivot 3, and the saw blade 1 is projected below the sliding surface 4 c of the surface plate 4 to a desired cutting depth. Next, if the operation lever 19a is turned in the tightening direction to fix the saw blade cover 2c and the guide link 17, the setting of the cutting depth is completed.

  At this time, when the saw blade cover 2c, that is, the housing 2 is inclined not parallel to the side edge 4b of the surface plate 4 and the guide link 17 is not in contact with the surface plate 4 as in the present invention, the operation lever 19a By tightening the guide link 17, the guide link 17 approaches the saw blade cover 2c and tilts, so that the housing 2 remains tilted with respect to the side edge 4b of the surface plate 4.

  However, in the present invention, the guide link 17 abuts on the surface plate 4 via the supporter 24b and is positioned at a right angle with respect to the surface plate 4, so that the saw blade cover 2c, that is, the housing 2 is a side edge of the surface plate 4. Even if the operating lever 19a is tightened in a state where it is not parallel to 4b and is inclined, the saw blade cover 2c, that is, the housing 2 approaches the guide link 17, the inclination is corrected, and the saw blade 1 is stored. Since the housing 2 is parallel to the side edge 4b of the surface plate 4, it is possible to provide a portable electric circular saw with good operability without lowering the machining accuracy.

  As shown in FIG. 2, when the guide link 17 is completely stored in the saw blade cover 2c, the rear end portion 2e of the saw blade cover 2c abuts on the rear end portion 17c of the guide link 17, and the guide link Even when a force that pushes 17 downward is applied, the guide link 17 is in contact with the surface plate 4 via the supporter 24b, so that not only the guide link 17 but also the housing 2 is not inclined, and machining accuracy is increased. Will not fall.

  In the above-described embodiment, one of the contact portions is the adjustment screw 28 that can be advanced and retracted. However, it may be any configuration as long as the two members can contact each other, and may be a screw, a simple plane, or It does not ask whether it is an uneven part. Moreover, although the adjustment screw 28 is provided in the surface plate 4, you may provide the same kind screw in the supporter 24b. Furthermore, although one contact part was provided in the supporter 24b, you may provide contact parts, such as a screw, in the guide link 17 directly.

The top view which made a part of portable electric circular saw concerning an embodiment of the invention a section. The front view of the portable electric circular saw shown in FIG. The rear view of the portable electric circular saw shown in FIG. The left view of the portable electric circular saw shown in FIG. The front view which removes a part of saw blade cover in a housing, and shows the portable electric circular saw shown in FIG. The front view which shows the state which made the cutting depth zero in the portable electric circular saw shown in FIG. The top view which shows the state in which the housing of the conventional portable electric circular saw inclined with respect to the side edge of a surface plate. It is a left view of the conventional portable electric circular saw shown in FIG. 7, and is a view showing the relationship between the guide link and the saw blade cover. FIG. 8 is an AA cross-sectional view of the conventional portable electric circular saw shown in FIG. 7.

DESCRIPTION OF SYMBOLS 1 Saw blade 2 Housing 2c Saw blade cover 3 Pivot 4 Surface plate 5 Cutting depth adjustment mechanism 6 Motor 17 Guide link 18 Support shaft 19 Bolt 19a Operation lever 24b Supporter 24d Tip part 25b Pivot pin 28 Adjustment screw

Claims (3)

A housing for housing the motor and saw blade;
A surface plate disposed below the housing and rotatably connected to the front end of the housing via a pivot;
A guide link that is connected to the surface plate so as to be pivotable at right angles to the side surface of the saw blade around a pivot pin that is fixed to the rear end of the surface plate, and that fixes the guide link and the housing. In a portable electric cutting machine having a cutting depth adjusting mechanism comprising a fixing means,
A portable electric cutting machine characterized in that a contact portion for allowing the guide link to stand perpendicular to the surface plate is provided between the surface plate and the guide link. The housing contains a saw blade and has a saw blade cover having a surface parallel to the side surface of the saw blade, and the guide link is in sliding contact with the surface parallel to the side surface of the saw blade in the saw blade cover, and its rear end. 2. A support member that is pivotable at a right angle with respect to the surface plate about a pivot pin that is fixed to the rear end portion of the surface plate via a support shaft. Portable electric cutting machine. The portable electric cutting machine according to claim 1 or 2, wherein a contact portion of either the surface plate or the guide link is a protruding portion, and a protruding amount of the protruding portion is adjustable.

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