JP2005074949A - Mounting structure for planer blade and planer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure capable of reducing a noise on processing by making a planer blade not simultaneously contacted with a work extending over the whole length of the planer knife owing to mounting the planer blade to be twisted like a screw on a revolving drum and of resolving a problem that a cost of the planer blade was run up because of making an irregularity of a height of the top of the blade generated by twisting regular by using a blade with a circular shape of the edge, further an equal working effect as the before can be obtained reducing a running cost. <P>SOLUTION: The mounting structure comprises mounting by forcibly bending the planer blade 1 with a plate form and with the edge of the blade having a linear form with a highly general purpose property and made in a low cost to the direction of the plate and by twisting the knife around the axis J of a revolving drum 10 as like screw at a step for mounting it on the revolving drum 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a cannula blade that is attached to a cannula for mainly cutting a plane of wood, and a cannula board to which a cana blade is attached by this mounting structure.

A portable cannula board that cuts the workpiece while the operator holds it in the hand or a stationary type cannula board that cuts the workpiece while moving the workpiece (hereinafter simply referred to as the “canna board”) uses an electric motor. A cylindrical drum that rotates around an axis as a drive source is provided, and a plurality of canna blades are usually attached to the outer peripheral surface of the drum along the rotation axis of the drum. The workpiece is cut by rotating the drum around its axis and moving the workpiece relatively while bringing the cannula blade into contact with the flat surface of the workpiece such as wood.
In general, as shown in FIG. 8, the Kanna blade 30 has a flat plate shape (band plate shape), and its end portions 30 a and 30 a in the width direction serve as cutting edges, and the cutting edge 30 a comes into contact with a workpiece to perform cutting. (So-called canna hanging) is made. However, since a large impact sound (noise) is generated when the cutting edge 30a simultaneously contacts the workpiece over its entire length, various devices have been conventionally used to reduce this noise.
For example, Japanese Examined Patent Publication No. 54-17993 discloses that a flat plate-shaped cannula blade is attached in a spiral manner with respect to the peripheral surface of the drum so that the cutting edge does not simultaneously contact the workpiece over its entire length. A technique for reducing noise during cutting is disclosed. Further, in Japanese Patent Publication No. 62-1804, as shown in FIG. 9, a flat plate shaped blade 40 in which the blade edges 40a, 40a form a gentle arc shape before being attached to the drum is spirally formed as described above. A technique is disclosed in which unevenness of the protruding dimension of the blade edge 40a from the drum peripheral surface (hereinafter referred to as blade edge height) generated by twisting and mounting is fixed and uniform.
In this way, by preparing a flat plate-like canine blade 40 in which the cutting edge 40a has an arc shape in advance, and attaching this to the peripheral surface of the drum in a spiral shape, the cutting edge height is made uniform and finished. It was possible to perform clean cutting efficiently and to reduce noise during cutting.
Japanese Patent No. 2515196 Japanese Patent Publication No.62-1804 Japanese Patent Publication No.54-17993

However, since the cutting edge 40a shown in FIG. 9 has a circular arc shape, the cutting edge 40a has a special shape with respect to the linear cutting edge 30 as shown in FIG. As a result, there is a problem in that the cost for exchanging the canna blade is increased, and as a result, the running cost of the canna board is increased.
Therefore, in the present invention, the cutting edge has a linear shape, the cost is not increased as in the prior art by using the most versatile and inexpensive canine blade, and the conventional cutting edge is equivalent to an arc shaped canine blade. It is an object of the present invention to provide a canna blade mounting structure and a cannula capable of performing high-quality cutting.

For this reason, this invention was taken as the structure described in each claim of a claim.
According to the mounting structure of the first aspect, since the flat plate-shaped canine blade is helically twisted along the peripheral surface of the drum, the blade edge of the canna blade simultaneously contacts the workpiece over its entire length. Without this, the noise during cutting can be reduced.
In addition to twisting spirally as described above, the cutting edge is curved and attached in a plate direction so that the cutting edge has an arc shape with a constant curvature when viewed in plan, so the cutting edge height of the canna blade is It is possible to eliminate irregularities caused by mounting by twisting in a spiral shape, and to make a uniform arrangement, thereby making it possible to efficiently perform clean cutting. The curvature of the cutting edge can be appropriately set according to other conditions such as the curvature in the twist direction.
Moreover, since it is configured to use the most versatile and inexpensive cannula blade that has a flat plate shape and the cutting edge forms a straight line shape, it is not necessary to use an expensive canting blade that has a circular arc shape in advance as in the past, Therefore, the running cost is not increased.

According to the Canna blade of the second aspect, the Canna blade having a linear cutting edge can be attached with a simple configuration in a state of being surely curved in the plate surface direction.
According to the canner blade of the third aspect, the flat plate-shaped canine blade can be reliably twisted and attached with a simple configuration.
According to the plane of the fourth aspect, since the plane blade does not simultaneously contact the workpiece over its entire length, noise during cutting can be reduced. Moreover, since the blade edge height is made uniform by twisting the Kanna blade while being bent in the direction of the plate surface, cutting with a fine finish can be performed efficiently.
In addition, since a flat plate-shaped general-purpose product having a linear cutting edge can be used as the canna blade to be attached, a special cana blade having a circular arc shape (blade edge curved in the plate surface direction) as in the past is used. Since it is not necessary to prepare, the running cost of the canna board can be reduced.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a rotating drum 10 to which a canine blade 1 is attached by the attachment structure of this embodiment. The present embodiment is characterized in the mounting structure of the canner blade 1 with respect to the rotating drum 10, and the basic structure (structure for rotating the drum, etc.) of the canna panel provided with the rotating drum 10 is conventionally known. Since no particular change is required as compared with the configuration, the description and illustration thereof are omitted.
The cannula blade 1 not attached to the rotating drum 10 is shown as a single item in FIG. This can blade 1 is the same as the can blade 30 shown in FIG. 8, and has a strip shape (flat plate shape) as shown in FIG. It is the most versatile one that is most commonly used in canna blades, and is usually available at the lowest cost. Both edges of the width 1 (vertical direction in FIG. 5) of the blade 1 are blade edges 1a and 1a. Both the blade edges 1a, 1a are each formed in a straight line shape (formed along the straight line), and are not curved in a circular arc shape (fan shape) unlike the cana blade 40 shown in FIG. The present embodiment is characterized in that this highly versatile can blade 1 is used as it is without any additional work.
A guide groove 1b having a trapezoidal cross-sectional shape is formed in the longitudinal direction at the center in the width direction of the surface of the canner blade 1 over its entire length. The guide grooves 1b are provided in parallel to each other along the two cutting edges 1a and 1a. The guide groove 1b has a function as a positioning groove for positioning so that the blade edge height is kept constant with respect to the rotating drum. In the present embodiment, the guide groove 1b and its function are also used as they are. In the present embodiment, as a result of the cannula blade 1 being attached to the rotary drum 10, it is bent in the direction along the plate surface and is spirally twisted around the rotation axis J of the rotary drum 10.
In this specification, the plate surface direction of the Kanna blade 1 refers to a direction along a plane perpendicular to the plate thickness direction as shown in FIG. 5, and to bend in the plate surface direction is as shown in FIG. One end side in the width direction (one cutting edge 1a) extends, and the other end side in the width direction (the other cutting edge 1a) is deformed in a contracting direction.

The rotating drum 10 is attached so as to cover the drum main body 11 having two mounting surfaces 11a and 11a at the circumferentially bisected positions facing each other, and both mounting surfaces 11a and 11a. Drum covers 12 and 12 for fixing to the drum body 11 are provided. As shown in FIGS. 1 and 4, the drum covers 12 and 12 are fixed along the attachment surface 11 a by a plurality of (five in the present embodiment) fixing bolts 13 to 13.
Both the attachment surfaces 11 a and 11 a are formed in curved surfaces that are spirally twisted with respect to the rotation axis J of the rotary drum 10. This can be understood by comparing FIG. 2 showing one side surface (left side surface) of the rotary drum 10 with the canner blade 1 attached and FIG. 3 showing the other side surface (right side surface). . That is, the relative position between the left end portion and the right end portion of the attachment surface 11a with respect to the axis J and the relative position between the left end portion and the right end portion of the canner blade 1 are different in FIGS. From this, the mounting surface 11a is formed in a continuously curved twisted curved surface between the left side surface and the right side surface of the rotating drum 10, and the canner blade 1 is spirally twisted along the mounting surface 11a. Attached to the state. Moreover, in FIG. 3, the edge part of the attachment surface 11a in the left side surface is shown with the dashed-two dotted line. It is understood that the relative position of the end of the mounting surface 11a on the right side shown by the solid line and the end of the mounting surface 11a on the left side shown by the two-dot chain line change while twisting around the rotation axis J. it can.
Furthermore, the attachment surface 11a is formed by being spirally twisted around the rotation axis J, and the drum covers 12, 12 are fixed along the attachment surface 11a. This can be understood from the fact that the axial directions of the fixing bolts 13 to 13 in FIGS. Since the drum cover 12 is formed in a twisted shape similarly to the attachment surface 11a, the drum cover 12 can be attached without difficulty (without applying a large external force) along the attachment surface 11a.

A positioning groove 11b for positioning the drum cover 12 in the surface direction of the mounting surface 11a is formed on both the mounting surfaces 11a and 11a. Both positioning groove portions 11b and 11b are provided along one end in the width direction of the attachment surface 11a. The positioning groove portions 11b and 11b are formed over the entire length of the mounting surface 11a (the entire length of the drum body 11). A positioning projection 12a is provided over the entire length of one end in the width direction of the drum cover 12 corresponding to the positioning groove 11b. Both the drum covers 12 and 12 are fixed to the drum main body 11 with the positioning convex portion 12a inserted into the positioning groove 11b, thereby positioning the drum cover 12 relative to the mounting surface 11a.
On the other end side in the width direction of the drum covers 12, 12, an accommodation recess 12b for accommodating the cannula blade 1 is formed over the entire length. Positioning convex portions 12c different from the positioning convex portions 12a are provided on the bottoms of the accommodating concave portions 12b and 12b over the entire length of the accommodating concave portion 12b (and thus over the entire length of the drum cover 12). The positioning convex portion 12c is not formed in a straight line, but is provided in a curved state. When the positioning blade 12 is attached, the positioning projection 12c is pushed into the guide groove 1b of the connecting blade 1 so that the connecting blade 1 is attached in a forcibly curved state instead of a linear shape. The bending direction of the positioning convex portion 12c is set to a direction in which the canner blade 1 is deformed in the direction in which the longitudinal center portion of the upper blade edge 1a swells when the upper blade edge 1a is used in FIG. Moreover, the positioning convex part 12c is formed in the curved shape with the curvature set appropriately according to conditions, such as the magnitude | size (curvature) of the twist of the said cutter blade 1, or its size (length).

The positioning convex portion 12c provided in this way is inserted into the guide groove 1b, and the canner blade 1 is forcibly deformed into a curved state, and the canner blade 1 remains in this deformed state while the mounting surface 11a of the drum body 11 and the drum By being sandwiched between the housing recess 12b of the cover 12, the canner blade 1 is fixed in a state of being positioned in the surface direction of the mounting surface 11a. By thus attaching the cutter blade 1, the cutter blade 1 is attached in a spirally twisted state with respect to the axis J of the drum body 11. When the cutter blades 1 and 1 are attached in a state of being spirally twisted around the axis J, the cutter blade 1 does not contact the workpiece at the same time over the entire length thereof, thereby cutting the workpiece. Noise at the time can be reduced. Moreover, the Kanna blade 1 is curved and attached, so that the blade edge height is kept constant. The positioning projection 12c of the drum cover 12 is formed with a curvature that satisfies this condition.
An escape recess 11c for releasing chips generated by the cutting process is formed on the peripheral surface of the drum body 11 along the cutting edge 1a of the two cannula blades 1 and 1 attached in this way over the entire length thereof. ing. The blade edges 1 a and 1 a of both the canner blades 1 and 1 are slightly projected from the peripheral surface of the drum body 11. The movement trajectory T of the blade edges 1a and 1a of the two blades 1 and 1 by the rotation of the rotary drum 10 is indicated by a two-dot chain circle in FIG.
On both side surfaces of the drum main body 11, rotary shaft portions 11d and 11d are provided concentrically with each other. The rotating drum 10 is rotatably connected to the rotating mechanism portion on the side of the main body through the rotating shaft portions 11d and 11d. Therefore, the shaft centers of the rotary shaft portions 11 d and 11 d correspond to the rotary axis J of the rotary drum 10.

According to the mounting structure of the cannula blade 1 of the present embodiment configured as described above, it is a strip-shaped cannula blade 1 and the most versatile cannula blade 1 having blade edges 1a and 1a having a linear shape. Since the cutting edge 1a is forcibly bent in the direction of the plate surface, the blade edge 1a is deformed into an arc shape, and is attached in a helically twisted state around the rotation axis J of the rotary drum 10. The noise during cutting can be reduced without incurring an increase in (running cost), and the cutting edge height can be made uniform, so that a finely finished cutting can be efficiently performed.
Moreover, the guide groove 1b provided in the canner blade 1 has a trapezoidal cross section. According to this, since the positioning convex portion 12c is guided to the inclined side wall of the guide groove 1b, the drum blade 12 is attached to the drum main body 11 so that the cana blade 1 is attached to the drum cover 12 and the mounting surface 11a of the drum main body 11. When the pin is sandwiched between them (when the cannula blade 1 is mounted), the positioning convex portion 12c that is curved into the linear guide groove 1b of the cannula blade 1 is smoothly fitted, whereby the cannula blade 1 is reliably bent. The

Various modifications can be made to the embodiment described above. For example, a configuration in which five fixing bolts 13 to 13 are used to fix one drum cover 12 to the drum body 11 is illustrated, but the number of fixing bolts 13 increases to six or more as necessary. On the contrary, it may be changed to one to four.
Moreover, although the rotary drum 10 of the form which inserts | pinches the blade 1 between the attachment surface 11a of the drum main body 11 and the drum cover 12 was illustrated, the attachment structure which concerns on this invention is a drum as shown, for example in FIG. The present invention can also be applied to a rotary drum 20 having no cover. The rotary blade 20 can also be attached with the same blade 1 as described above.
The rotating drum 20 includes a drum body 21 having a substantially cylindrical shape. Similar to the rotary drum 10, support shafts are provided along the rotation axis J at the centers of both sides of the drum body. Accordingly, the rotating drum 20 is also rotatably supported on the canna disc via both support shafts.
Two mounting grooves 22 and 22 are provided over the entire length in the longitudinal direction at the position of the drum body 21 on the circumferential surface. A long holding block 23 is inserted into each of the mounting grooves 22, 22. The holding block 23 is attached by screwing a fixing bolt (not shown) into the screw holes 24 to 24 provided in the one side wall portion 22a of the mounting groove 22 and pressing toward the other side wall portion 22b. It is fixed in the groove 22.
The other side wall 22 b of each of the mounting grooves 22, 22 is provided in a state of being spirally twisted with respect to the rotation axis J of the drum main body 21. In accordance with this, the side portion 23a of the holding block 23 facing the other side wall portion 22b is also provided in a spirally twisted state with respect to the rotation axis J, similarly to the side wall portion 22b.
Further, a positioning convex portion 22c is provided along the longitudinal direction on the other side wall portion 22b of each of the mounting grooves 22, 22. Both positioning convex portions 22c and 22c are provided in a state of being curved in the surface direction of the side wall portion 22b. The positioning convex portion 22 c corresponds to the positioning convex portion 12 c in the rotary drum 10, and the positioning convex portion 22 c is fitted into the guide groove 1 b of the cannula blade 1.
Further, as shown in the drawing, a plurality of magnets 25 to 25 are embedded in the bottom surfaces 22d and 22d of the mounting grooves 22 and 22 at appropriate intervals. The magnets 25 to 25 prevent the holding block 23 from inadvertently dropping from the mounting groove 22 when the fixing bolt is loosened. In addition, this magnet is good also as a structure which attaches one elongate thing over the full length of the attachment groove | channel 22. As shown in FIG.

According to the above configuration, the canner blade 1 is sandwiched between the other side wall portion 22b of the mounting groove 22 and the side portion 23a of the holding block 23, and in this state, fixing bolts are screwed into the respective screw holes 24 to hold the holding block. By pressing the cannula blade 1 against the side wall part 22b through the 23, the cannula blade 1 is attached in a curved state in the surface direction of the side wall part 22b.
In addition, the cannula blade 1 is helically sandwiched between a side wall portion 22b and a side portion 23a provided in a state of being spirally twisted with respect to the rotation axis J, respectively, as in the case of the rotary drum 10. It is attached in a twisted state.
Therefore, even with the attachment structure shown in FIG. 7, the cannula blade 1 does not simultaneously contact the workpiece along the entire length as the rotary drum 20 rotates, so that noise during cutting can be reduced. The canner blade 1 is attached in a state in which it is forcedly bent along the surface direction of the side wall portion 22b by fitting the positioning convex portion 22c that curves in the surface direction of the side wall portion 22b into the guide groove 1b. Therefore, it is possible to eliminate unevenness in the height of the cutting edge due to the helically twisted attachment as described above, and thereby it is possible to efficiently perform a clean finish.
In addition, in this mounting structure, the cannula blade 1 has a flat plate shape and a highly versatile one with a straight edge, so that the cannula blade 40 having a curved edge is twisted and attached in advance. Cost can be reduced as compared with the case.

Each embodiment described above can be further modified. For example, although the Canna blade 1 provided with the blade edges 1a and 1a on both sides in the width direction is illustrated, it can be similarly applied to a Canna blade having a blade edge only on one side.
Furthermore, although the guide groove 1b having the trapezoidal cross section in the cannula blade 1 and the positioning convex part 12a in the drum cover 12 are illustrated, the cross section is trapezoidal on the drum cover side and curved in the plane direction of the cannula blade. It is good also as a structure which provides the guide groove to perform and provides the positioning convex part integrally in the cannula blade side.
Moreover, although the rotating drum 10 of the structure which attaches the two cutter blades 1 and 1 was illustrated, it is the same also to the rotating drum which attaches the one canine blade 1 or the rotating drum which attaches the three or more cutter blades 1-1. Can be applied to.

It is a figure which shows embodiment of this invention, and is a front view of the rotating drum which attached the blade. It is (2) arrow directional view of FIG. 1, Comprising: It is a left view of a rotating drum. It is (3) arrow directional view of FIG. 1, Comprising: It is a right view of a rotating drum. FIG. 4 is a cross-sectional view taken along line (4)-(4) in FIG. 1, and is a cross-sectional view of the rotating drum. It is a perspective view of a Kanna blade simple substance. It is a front view of a Kanna blade simple substance. This figure has shown the state which curved the plane blade in the plate | board surface direction. It is the figure which applied the attachment structure of this invention to the rotating drum of another form, and is a cross-sectional view of a rotating drum. It is a front view of the most versatile can blade with a flat plate shape and a cutting edge having a linear shape. This figure has shown the state before attaching to a rotating drum. It is a front view of the plane of a plane with a flat blade shape and a cutting edge having an arc shape.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Canna blade 1a ... Blade edge, 1b ... Guide groove 10 ... Rotating drum 11 ... Drum main body, J ... Rotating axis 11a ... Mounting surface, 11b ... Positioning groove, 11d ... Rotating shaft part 12 ... Drum cover 12a ... Positioning convex part, 12b ... accommodating recess, 12c ... positioning projection 13 ... fixing bolt 20 ... rotating drum 21 of another form ... drum body 22 ... mounting groove 23 ... holding block 25 ... magnet 30 ... canna blade, 30a ... cutting edge (width direction end)
40 ... Canna blade, 40a ... Cutting edge

Claims (4)

  It is a structure for attaching a strip-shaped canine blade to a rotating rotating drum, and in a state where it is not attached to the rotating drum, a flat blade-shaped canine blade having a linear cutting edge is used as the cutting edge. A mounting structure of a cannula blade configured to be helically twisted and attached to the rotation axis of the drum in a state of being bent in the plate surface direction of the cannula blade.   The mounting structure according to claim 1, wherein the rotating drum includes a drum body and a drum cover that is separably attached to the drum body, and a cannula blade is attached between the drum body and the drum cover. The drum cover is provided with a positioning convex portion that is curved in the plate surface direction of the canner blade, while the linear guide groove is provided on the canner blade, and the positioning convex portion is pushed along the guide groove. In the mounting structure of the cannula blade, the structure is such that the cannula blade is forcibly bent in the plate surface direction.   The mounting structure according to claim 1, wherein the rotating drum includes a drum body and a drum cover that is separably attached to the drum body, and a cannula blade is attached between the drum body and the drum cover. The drum body is provided with a mounting surface that is spirally twisted with respect to the rotation axis of the drum body, and the canner blade is spirally twisted by pressing and deforming the canner blade against the mounting surface. Canna blade mounting structure that is designed to be mounted in a heated state.   A cannula board in which a cannula blade is attached to a rotating drum by the attachment structure according to any one of claims 1 to 3.

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