JP2016087732A - Desktop cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a desktop cutter capable of smooth cutting work, by preventing contact between a workpiece and a protective cover in cutting time.SOLUTION: A desktop cutter comprises a base for supporting a workpiece and a cutting part 10 vertically rockably supported to the base and rotatingly driving a circular saw blade 20, and the cutting part 10 comprises a cutting part case 11 for covering an upper part of the circular saw blade 20, a protective cover 16 for covering a circular saw blade part uncovered with the cutting part case 11, a link 50 for interlocking vertical rocking of the cutting part 10 and rotation of the protective cover 16, a link support part 70 provided in the cutting part case 11 and guiding rotation of the link 50, a handle 14 for operating the cutting part 10 and an operation lever 61 for rotating the protective cover 16 in an opening direction.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a tabletop cutting machine for cutting a workpiece (cut material) on a base with a rotating cutting tool.

  In conventional power tools, when the workpiece is supported on the base and the cutting work is performed, the workpiece and the protective cover covering the circular saw blade come into contact with each other, and the workpiece is damaged. In addition, since the protective cover covers the circular saw blade, it is difficult to check the cutting state at the time of cutting, which hinders smooth cutting work. Conventionally, a tabletop cutting machine having a mechanism for operating a protective cover using a lever for the purpose of black line alignment is cited in Patent Document 1, but it is difficult to prevent contact between the workpiece and the protective cover during cutting. It was a configuration.

Japanese Patent Laid-Open No. 2-112901

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a tabletop cutting machine that can prevent contact between a workpiece and a protective cover at the time of cutting and enables smooth cutting work. It is in.

One embodiment of the present invention is a tabletop cutting machine. The tabletop cutting machine includes a base that supports a workpiece, and a cutting unit that is supported so as to be swingable up and down with respect to the base and that rotates the cutting tool.
The cutting portion includes a cutting portion case that covers an upper portion of the cutting tool, a protective cover that is provided so as to be rotatable with respect to the cutting portion case and covers a cutting tool portion that is not covered by the cutting portion case, and the cutting A link that interlocks the vertical swing of the part and the rotation of the protective cover, a link support part that is provided in the cutting part case to guide the rotation of the link, a handle that operates the cutting part, and the protection It has an operation part which makes it possible to increase the amount of rotation of a cover.

  In the above aspect, the operation unit may be positioned near the handle.

  The said aspect WHEREIN: The said operation part is good to make it increase the rotation amount of the said protective cover by rotating the said link.

  The operation unit may be configured to rotate the link by moving the link support unit. Furthermore, the operation unit may be a lever provided in the cutting unit case, and one end of the lever may be an operation end, and the link support unit may be interlocked with the movement of the other end.

  The structure which has a sublink between the said operation part and the said link, and rotates the said link via a sublink in the said operation part may be sufficient.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  The tabletop cutting machine of the present invention has an operation part that rotates the protective cover covering the cutting tool in the opening direction, and the opening range of the protective cover can be easily expanded by the operation part during the cutting operation. It is. Accordingly, contact between the workpiece and the protective cover can be prevented, and the cutting operation can be performed without damaging the workpiece without directly operating the protective cover by hand.

BRIEF DESCRIPTION OF THE DRAWINGS It is 1st Embodiment of the tabletop cutting machine which concerns on this invention, Comprising: The left view which shows the state before workpiece cutting. In 1st Embodiment, the left view which shows the state in the middle of a workpiece cutting. The left view which shows the principal part structure in 1st Embodiment. FIG. 4 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a right side view illustrating a configuration of a main part according to the first embodiment and a state before an operation lever as an operation unit is operated. The right view which similarly shows the state after operation lever operation. In 1st Embodiment, it is a left view which shows the state before operation lever operation in the case of pushing and cutting a workpiece. The left view which similarly shows the state after operation lever operation. The left side view which is the 2nd Embodiment of this invention and shows the state before work material cutting | disconnection (before operation part operation). In 2nd Embodiment, the left view which shows the state in the middle of a workpiece cutting (after operation part operation). The left side view which is a main structure in 2nd Embodiment, and shows the state before operation lever operation. BB sectional drawing of FIG. The left side view which is a main structure in 2nd Embodiment, and shows the state after operation lever operation.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, process, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are examples, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  A first embodiment of a tabletop circular saw as a tabletop cutting machine according to the present invention will be described below with reference to FIGS. In addition, the up-down direction and the front-back direction in the following description are defined as shown in FIG.

  In these drawings, the tabletop circular saw includes a base 1 on which a workpiece 40 can be placed, a cutting unit 10 having an electric motor 21 that rotationally drives a circular saw blade 20 as a cutting tool, and the cutting unit 10 as a base. 1. A cutting portion support mechanism that is swingable in the vertical direction of 1 and slidably supported in parallel with the base 1 and that supports the rotating surface (side surface) of the circular saw blade 20 so as to be tiltable with respect to the upper surface of the base 1. 30.

  The base 1 has a structure that can be placed on a floor surface, a table surface, or the like. The base 1 is embedded with a turntable 2 having an upper surface that is substantially flush with the upper surface of the base 1, and the turntable 2 is formed on the upper surface. It is connected to the base 1 so as to be freely rotatable via an orthogonal rotation shaft. During the work, the workpiece 40 can be placed on the base 1 and the turntable 2.

  Although the structure of the cutting part support mechanism 30 will be described later, the cutting part support mechanism 30 is attached to the turntable 2. When the turntable 2 is rotated, the cutting part support mechanism 30 and the cutting part are integrated therewith. 10 also rotates (that is, the orientation in the horizontal plane with respect to the base 1 changes).

  The base 1 is provided with a pair of fences 3 each having a pressing surface 3a substantially orthogonal to the upper surface. When the workpiece 40 having a square cross section is cut, the pressing surface 3a of the fence 3 is processed. By performing the cutting operation in a state where one surface of the material 40 is in contact with the material 40, a stable cutting operation can be performed. When the turntable 2 is rotated with respect to the base 1, the position of the cutting portion 10 that rotates together with the turntable 2 is changed with respect to the fence 3, whereby the pressing surface 3 a of the fence 3 and the circular saw blade are changed. The angle with the 20 rotation surfaces (side surfaces) changes, and the workpiece 40 in contact with the fence 3 can be cut at various angles.

  The cutting portion support mechanism 30 is a holder that can be fixedly attached to the turntable 2 by adjusting the posture from a standing state perpendicular to the upper surface of the turntable to an inclined state so as to form a predetermined angle with respect to the upper surface. 5, at least two guide bars 7 fixed and supported in parallel with the upper surface of the turntable by the holder 5, a slider 8 provided slidably with respect to the guide bar 7, and the cutting portion 10 is shaken by the slider 8. And a hinge 9 that is movably connected.

  The cutting unit 10 transmits the rotation of the motor 21 to a rotating shaft 22 to which the circular saw blade 20 is fixed via a belt 23 as a rotation transmission mechanism, and a cutting unit case that houses the motor 21 and the rotation transmission mechanism. 11. The cutting part case 11 includes a part to be the main cover 12 that covers the upper part of the circular saw blade 20 (has a single body).

  The rear end portion of the cutting portion case 11 is connected to the slider 8 via a hinge 9. That is, the rear end portion of the cutting portion case 11 is attached to the slider 8 by the hinge shaft 9 a of the hinge 9, that is, swingable in a direction approaching and moving away from the base 1. The cutting portion case 11 is urged upward by a spring (not shown) provided around the hinge shaft 9a. Therefore, unless a downward operating force is applied to the operation handle 14 provided on the upper portion of the cutting portion case 11, the cutting portion 10 is positioned at the uppermost end by a stopper (specific description is omitted) provided around the hinge 9. The position is restricted to the state shown in FIG. That is, unless a downward operating force is applied to the operation handle 14, the rotary shaft 22 is positioned at the uppermost end. The operation handle 14 is provided with a trigger switch SW1 for controlling the rotation and stop of the motor 21.

  The cutting unit 10 includes a protective cover 16 that covers a portion of the circular saw blade 20 that is not covered by the main cover 12 that is configured by a part of the cutting unit case 11. The protective cover 16 is supported so as to rotate and move along the inner side of the main cover 12, and one end of the link 50 serving as a rotation mechanism of the protective cover 16 is fixed to the hinge 9 (part fixed to the slider 8). A roller 51 (for example, using a ball bearing) connected to the arm 18 by a pin 19 and provided at the other end of the link 50 engages with a rib 16a formed on the right side surface of the protective cover 16. . An intermediate portion of the link 50 is in contact with a link support portion 70 (for example, a roller using a ball bearing) that is rotatably provided inside the main cover 12.

  When the operation handle 14 is pushed down toward the lowermost end from the state of FIG. 1 in which the rotation shaft 22 of the cutting unit 10 is at the uppermost end, the hinge shaft 9a that is the rotation center of the cutting unit 10 and the rotation center of the link 50 are used. Due to the distance between the pins 19, the positional relationship between the roller 51 and the rib 16 a changes and is guided by the link 50 to rotate the protective cover 16 counterclockwise as indicated by an arrow L in FIG. Thereby, the circular saw blade 20 is exposed as shown in FIG. 2 so that the workpiece 40 can be cut. Conventionally, since the position of the link support portion 70 that contacts the intermediate portion of the link 50 is fixed, the protective cover 16 cannot be further rotated from the state of FIG. 2 to expand the opening range of the protective cover 16. In 2, when the cutting portion 10 is moved backward, the protective cover 16 comes into contact with the workpiece 40.

  For this reason, in the present embodiment, as shown in FIGS. 3 to 6, the position of the link support portion 70 contacting the intermediate portion of the link 50 is variable, and the rotation amount of the protective cover 16 at an arbitrary position of the cutting portion 10. A protective cover operating mechanism 60 is provided (which increases the opening range of the protective cover 16).

  The protective cover operating mechanism 60 is movable in the lateral direction with respect to the cutting portion case 11, a link support portion 70 that is movable in the lateral direction (front-rear direction), an operation lever 61 as an operating portion, and the cutting portion case 11. The provided shaft 62, the connecting metal 63 fixed to one end of the shaft 62 and connected to the mounting shaft of the link support 70, and the other end of the shaft 62 abut on the abutting end 61 b of the operation lever 61. And a spring 65 for urging the shaft 62.

  As shown in FIGS. 3 to 6, a long hole portion 71 is formed in the cutting portion case 11. The link support part 70 functions as, for example, a roller having a ball bearing attached thereto with the bolt 72 as a pivot, and the bolt 72 passes through the elongated hole part 71 and fits with the connection fitting 63 with the cutting part case 11 interposed therebetween. (Penetrating). A retaining nut 73 is screwed to the end of the bolt 72 so that the link support portion 70 can move along the long hole portion 71. The connecting metal fitting 63 fitted to the bolt 72 moves the bolt 72, that is, the link support portion 70 along the elongated hole portion 71 as the shaft 62 moves in the lateral direction.

  The operation lever 61 is rotatably attached to the cutting part case 11 by a screw 66 screwed to the cutting part case 11. The operation end 61a of the operation lever 61 is disposed near (near) the handle 14 so that it can be operated by a hand holding the handle 14. The shaft 62 is slidably supported in the lateral direction by the support convex portions 11a and 11b provided on the right side surface of the cutting portion case 11, and the shaft between the ring 64 fitted in the intermediate portion of the shaft 62 and the support convex portion 11a. It is urged forward by a spring 65 provided around the periphery.

  Therefore, when the operation lever 61 is not operated, the bolt 72 which is the pivot of the link support portion 70 returns to the front end position of the long hole portion 71 as shown in FIG. That is, the link support part 70 returns to the original position, and the operation of opening the protective cover 16 by operating the link 50 with the up-and-down rotation of the cutting part 10 becomes possible. When the operation end 61a of the operation lever 61 is operated (when the operation lever 61 is rotated counterclockwise around the screw 66 in FIGS. 5 and 6), the contact end 61b of the operation lever 61 and the shaft 62 are operated. The bolt 72 which is the pivot of the link support portion 70 moves toward the rear end position of the long hole portion 71 through the connecting metal 63 fixed to the other end. When the operation amount of the operation lever 61 is maximum, the bolt 72 which is the pivot of the link support portion 70 is the rear end position of the long hole portion 71 as shown in FIG.

In the first embodiment described above, when the workpiece 40 is a plate material, when the operation handle 14 is pushed down toward the lowermost position from the state of FIG. 50, the protective cover 16 rotates counterclockwise as indicated by an arrow L in FIG. 1 to expose the circular saw blade 20 as shown in FIG. 2 so that the workpiece 40 can be cut. In FIG. 2, when the cutting portion 10 is further moved rearward, the protective cover 16 comes into contact with the workpiece 40, but before that, the operation lever 61 is operated to link the link support portion 70. When the state is moved from the state 5 (advanced state) to the state shown in FIG. 6 (retracted state), the link 50 is pushed up from below by the link support 70 and rotates about the rotation axis (pin 19). In conjunction with the rotation of the link 50, the roller 51 pivotally attached to the other end of the link 50 abuts against the rib 16a on the protective cover 16 side and lifts to further rotate the protective cover 16. The amount of rotation can be increased (opening range can be expanded). Therefore, the cutting portion 10 having the circular saw blade 20 is slid and the cutting of the workpiece 40 by the circular saw blade 20 is continued with the rotation amount of the protective cover 16 of FIG. Cutting can be performed without bringing the protective cover 16 into contact with the workpiece 40.
In addition, although it was set as the structure which increases the rotation amount of the protection cover 16 in the arbitrary positions of the cutting | disconnection part 10, in the said operation | work, the rotation amount of the protection cover 16 is the state in which the position of the cutting | disconnection part 10 is located at least in the lowest end. If the configuration can be increased, the above effect can be obtained.

  When the workpiece 40 is a square member as shown in FIGS. 7 and 8, it is a push-cut process. At this time as well, by operating the operation lever 61 in the state of FIG. 7, the opening range of the protective cover 16 as shown in FIG. The cutting portion 10 having the circular saw blade 20 is rotated downward to continue the cutting of the workpiece 40 by the circular saw blade 20, and the cutting processing is performed without bringing the protective cover 16 into contact with the workpiece 40. Can be executed.

  According to the present embodiment, the following effects can be achieved.

(1) It has an operation lever 61 for manual operation for rotating the protective cover 16 covering the circular saw blade 20 in the opening direction, and the rotation amount of the protective cover 16 is easily increased by the operation lever 61 along with the cutting operation. It is possible. Thereby, the contact between the workpiece 40 and the protective cover 16 can be prevented, and the cutting operation can be performed without damaging the workpiece 40.

(2) Since the operation lever 61 is located near (near) the handle 14, the opening amount of the protective cover 16 can be easily expanded only with the hand on the side that operates the cutting part 10 (while holding the handle 14). Yes, the workpiece 40 can be firmly fixed with the other hand to perform a smooth cutting operation.

(3) It is a mechanism for moving the existing link support part 70 for operating the link, and there are few mechanism parts added to the conventional apparatus, and the structure is simple. Further, the link support portion 70 returns to its original position when the operation lever 60 is not operated, and the link 50 is operated in accordance with the vertical rotation of the cutting portion 10 so that the protective cover 16 can be opened.

  A second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, a protective cover operating mechanism for manually operating the protective cover 16 is different from that of the first embodiment described above, and the other configurations are the same. The protective cover operation mechanism 80 according to the second embodiment includes an operation lever 81 as an operation unit, a guide rib 82 that reciprocally guides the operation lever 81 so as not to drop off, and a sub link 83 that interlocks with the operation lever 81. And a sub-link fall-preventing rib 84 that restricts the rotation range of the sub-link 83.

  The distal end of the operation lever 81 as an operation portion is disposed near (near) the handle 14, and the operation lever 81 can reciprocate (slide) relative to the cutting portion case 11 by a guide rib 82 provided on the cutting portion case 11. Is provided. The sub link 83 is rotatably attached to the cutting portion case 11 by a screw 90 that is a rotation fulcrum screwed to the cutting portion case 11. A claw 83a is formed at one end of the sub link 83 (closer to the rotation fulcrum), and a claw 81a at the end of the operation lever 81 can come into contact therewith. A roller 85 (for example, using a ball bearing) is attached to the other end of the sub link 83. The roller 85 is in contact with the inside of a rib 50 a provided integrally with the link 50.

  9 and 11, when the operating lever 81 is not operated, the protective cover operating mechanism 80 does not act on the link 50, and the circular saw blade 20 is protected when the rotary shaft 22 of the cutting portion 10 is at the uppermost end. Covered with a cover 16. On the other hand, as shown in FIGS. 10 and 13, by pulling the front end portion of the operation lever 81 toward the front, the claw portion 81a at the end of the operation lever 81 comes into contact with the claw 83a of the sub link 83, and the sub link 83 is moved in FIG. Turn clockwise (clockwise). As a result, the roller 85 at the end of the sub link 83 abuts on the rib 50a of the link 50 to move the link 50 in accordance with the amount of rotation of the sub link 83, and the rib 16a on the protective cover 16 side by the roller 51 at the link end. It is possible to open the protective cover 16 regardless of the height position of the cutting part 10 by moving them in contact with each other. The opening range of the protective cover 16 can be controlled by moving the link 50 in accordance with the rotation amount of the sub link 83, that is, the operation amount of the operation lever 81.

  Accordingly, when the operating handle 14 is pushed down from the state of FIG. 9 where the rotation shaft 22 of the cutting part 10 is at the uppermost end toward the lowermost end, the protective cover 16 is rotated counterclockwise by the link 50 and the circular saw blade 20 is moved. If the protective cover 16 may come into contact with the workpiece 40, the operating lever 81 is manually operated as shown in FIG. 10 to expand the opening range of the protective cover 16 as shown in FIG. By cutting 40, cutting can be performed without damaging the workpiece 40.

  In the second embodiment, the same effect as that of the first embodiment can be obtained.

  The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, modifications will be described.

  In the above-described embodiment, the rotation amount of the protective cover 16 is increased at an arbitrary position of the cutting part 10. However, the rotation amount of the protective cover 16 is increased at least in a state where the cutting part 10 is located at the lowermost end. It is good also as a structure.

  In the above embodiment, the rotation amount of the protective cover 16 is increased by rotating the link 50. However, only when the cutting unit 10 is swung downward, the operation unit may be operated so that the operation unit directly rotates the protection cover 16 to increase the rotation amount of the protection cover 16.

  In the above embodiment, a circular saw blade is shown as an example of a cutting tool, but a cutting grindstone or the like may be used.

1 ... base, 2 ... turntable, 3 ... fence, 5 ... holder, 7 ... guide bar,
9 ... hinge, 10 ... cutting part, 11 ... cutting part case, 12 ... main cover, 14 ... handle,
16 ... Protective cover, 16a, 50a ... Rib, 20 ... Circular saw blade, 21 ... Motor,
23 ... Belt, 30 ... Cut support mechanism, 40 ... Work material, 50 ... Link,
51, 85 ... roller, 60, 80 ... protective cover operation mechanism, 61, 81 ... operation lever,
62 ... Shaft, 63 ... Connecting metal fitting, 65 ... Spring, 66, 90 ... Screw,
70 ... Link support part, 71 ... Long hole part, 72 ... Bolt, 83 ... Sub link,
SW1 ... switch,

Claims (6)

A base that supports the workpiece,
A cutting portion that is supported so as to be swingable up and down with respect to the base, and that rotationally drives the cutting tool;
The cutting portion includes a cutting portion case that covers an upper portion of the cutting tool, a protective cover that is provided so as to be rotatable with respect to the cutting portion case and covers a cutting tool portion that is not covered by the cutting portion case, and the cutting A link that interlocks the vertical swing of the part and the rotation of the protective cover, a link support part that is provided in the cutting part case to guide the rotation of the link, a handle that operates the cutting part, and the protection A tabletop cutting machine having an operation unit that enables an increase in the amount of rotation of the cover.   The desk cutting machine according to claim 1, wherein the operation unit is located near the handle.   The tabletop cutting machine according to claim 1 or 2, wherein the operation unit increases the rotation amount of the protective cover by rotating the link.   The desktop cutting machine according to claim 3, wherein the operation unit rotates the link by moving the link support unit.   5. The operation unit according to claim 4, wherein the operation unit is a lever provided in the cutting unit case, and one end portion of the lever serves as an operation end unit, and the link support unit is interlocked with the movement of the other end unit. Described tabletop cutting machine. A sub-link between the operation unit and the link;
The tabletop cutting machine according to claim 3, wherein the operation unit rotates the link via a sublink.

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