JP2000025007A - Bite depth regulation mechanism for trimmer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bite depth regulation mechanism for a trimmer which is capable of easily measuring the amount of projection of a bit. SOLUTION: A rack 3 is installed, in the axial direction of a trimmer body, on the casing 11 of a trimmer body 1, and a pinion 4 is mounted on a base 2 which holds the trimmer body 1 in such a manner that it is movable in the axial direction. Further the rack 3 is engaged with the pinion 4 and the trimmer body 1 is moved with the base 2 in the axial direction to regulate the bite depth of the bit B. In the bite depth regulation mechanism for a trimmer T of the described structure, either of a graduation member 5 with graduations indicating the bite depth of the bit B nicked in the circumferential direction or a reference mark 6 indicating a specified graduation against the graduation member 5, is provided in a freely rotatable manner with the rotary shaft of the pinion 4. And the other is provided on the base 2. In addition, at least, either of the graduation member 5 or the reference mark 6 is set to be rotatable in the peripheral direction independently of the rotary shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trimmer cutting depth adjusting mechanism for adjusting a cutting depth by projecting a bit of a trimmer from a reference plane by a predetermined length.

[0002]

2. Description of the Related Art There is a trimmer as a tool for forming a groove at a predetermined depth from the surface of a work material. The trimmer includes a cylindrical casing that forms an outline of the trimmer main body, and a base that grips the trimmer main body so as to be movable in the vertical direction.

Conventionally, when adjusting the depth of cut, the trimmer body is moved up and down with respect to the base to change the amount of protrusion of the bit projecting from the lower end surface of the base plate provided at the lower end of the base. That is being done.
In addition, as a method of moving the trimmer body up and down, slide the trimmer body with respect to the base by hand, move the trimmer casing, install a rack in the vertical direction, provide a pinion on the base, and engage them I was going.

In this case, the extent to which the bit actually protrudes from the lower end surface of the base plate can be measured using a ruler, a caliper, or the like, or a seal having a scale attached to the surface of a trimmer casing or this seal. One of the reference marks corresponding to the scale is attached and the other is attached to the base for confirmation.

[0005]

However, measurement using a ruler, caliper, or the like takes a lot of trouble. On the other hand, in the case where the sticker is attached, not only the setting of the zero point position of the scale cannot be performed, but also since the scale has been attached to the side face, the scale has to be read as if looking into the scale, which is inconvenient.

In view of the above, the present invention provides a trimmer cutting depth adjusting mechanism which can easily measure the amount of protrusion of a bit and can adjust the zero point position of the scale.

[0007]

According to the first aspect of the present invention, a rack (3) is provided in the casing (11) forming the outer shell of the trimmer main body (1) in the axial direction of the trimmer main body (1), and the trimmer main body (1) is provided. A pinion (4) is provided on a base (2) for gripping the trimmer body (1) movably in the axial direction, and the trimmer main body (1) is brought into contact with the rack (3) and the pinion (4). In the cutting depth adjusting mechanism for the trimmer (T) for adjusting the cutting depth of the bit (B) by moving the cutting depth of the bit (B) in the axial direction with respect to (2), a scale indicating the cutting depth of the bit (B) is circled. Either a scale member (5) provided along the circumferential direction or a reference mark (6) indicating a predetermined scale of the scale member (5) corresponding to the scale member (5) is set to the pinion (4). ) Can rotate with the rotation shaft (41) Only, it provided the other to the base (2).

According to a second aspect of the present invention, in the cutting depth adjusting mechanism of the first aspect, at least one of the scale member (5) and the reference mark (6) is independent of the rotating shaft (41). And rotatable in the circumferential direction.

According to the third aspect of the present invention, the casing (11) forming the outer shell of the trimmer main body (1) and the base (2) for gripping the trimmer main body (1) movably in its axial direction.
A trimmer (T) cutting depth adjusting mechanism for adjusting the cutting depth of the bit (B) by moving the trimmer body (1) in the axial direction with respect to the base (2). (11) A scale plate (7) extending in the axial direction of the trimmer (T) is provided on one of the base (2) and a reference mark (6) indicating a predetermined position of the scale plate (7) on the other. ) So that at least one of the scale plate (7) and the reference mark (6) is movable in the axial direction.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a first embodiment of the present invention.

The trimmer T forms an outer shell of the trimmer main body 1,
A vertically elongated casing 11 formed in a substantially cylindrical shape, a cylindrical base 2 for gripping the outer peripheral surface of the casing 11, and a lower end of the base 2 for guiding the trimmer T along the upper surface of the workpiece W. A base plate P having a flat plate shape.

The head 12 forming the upper part of the casing 11 has
It is formed in a slightly angular shape, and is provided with a drive motor and the like (not shown). On the other hand, at the lower end of the trimmer main body 1, a bit B for applying a groove processing or the like to the workpiece W is attached. The bit B is rotated by a drive motor (not shown) built in the casing 11. A rack 3 is provided on the cylindrical portion 13, which is gripped by the base 2 of the casing 11 and is formed in a cylindrical shape, extending vertically from the lower end of the casing 11 to the central portion of the cylindrical portion 13. I have.

A base 2 for gripping the outer periphery of the casing 11 of the trimmer main body 1 has a vertically long cylindrical grip portion 2.
1 and a support portion 22 extending along the horizontal direction at the lower end of the grip portion 21.

The grip portion 21 is provided with a notch portion 211 which is partially cut out over the entire area in the axial direction. The width of the notch 211 is formed slightly wider than the width of the rack 3 described above. The base 2 is gripped by the casing 11 with the notch 211 aligned with the position of the rack 3. On both sides of the cutout portion, pinion attachment portions 212, 212 formed in a truncated cone so as to face each other are provided on the outer peripheral surface of the grip portion 21. A pinion 4 meshing with the rack 3 is provided between the pinion mounting portions 212 and 212 via the rotary shaft 41.
It is provided rotatably supported by 12,212.
The pinion 4 is configured such that the rotating shaft 41 is
2, 212, the pinion mounting portion 2
12 and 212 are rotatably supported. The pinion mounting portions 212 are attached to the casing 11 from outside by a tightening screw 43 formed like a thumb screw for tightening the base 2 to the casing 11 and a position adjustment knob 42 for rotating the pinion 4.

The position adjustment knob 42 has a convex vertical cross-section including a large diameter portion and a small diameter portion. The small diameter portion is directed toward the pinion 4 and the rotation shaft 41 is inserted into the center of the pinion 4. The position adjustment knob 42 is attached so as not to idle with respect to the rotation shaft 41.

A scale collar 5 formed in a thin circular tube is provided on the outer periphery of the small diameter portion. When the scale color 5 is turned with a certain force or more, the position adjustment knob 42 is turned.
And can be slid in the circumferential direction with respect to the outer peripheral surface, and is attached by an intermediate fitting so that the position adjusting knob 42 simply rotates together with the pinion (see FIG. 2). .

The manner of attaching the scale collar 5 is not limited to this, and for example, the position adjustment knob 42
And a clearance fit may be provided, and a non-slip member such as an O-ring may be interposed and attached to the outer periphery of the small diameter portion of the position adjustment knob 42 (see FIG. 3).

A scale is engraved on the outer peripheral surface of the scale collar 5 along the circumferential direction. On the other hand, of the pinion attachment portions 212, 212, the position adjustment knob 42
The reference mark 6 indicating the scale of the scale collar 5 is provided on the surface of the pinion mounting portion 212 on the side where the is mounted.

Further, a discharge window 213 is provided below the grip portion 21 for discharging the processing dust cut out along the peripheral surface.

On the other hand, a flat support portion 22 provided at the lower end of the grip portion 21 is provided along the horizontal direction so as to be orthogonal to the grip portion 21. The peripheral edge of the support portion 22 projects radially outward from the outer periphery of the grip portion 21, so that the trimmer main body 1 can be kept upright. An opening 221 through which the bit B can be freely inserted is provided at the center of the support portion 22.

Further, on the lower surface of the support portion 22, a flat plate-shaped base plate P formed in a square having one side length equal to the diameter of the support portion 22 is closely attached. An opening P1 through which the bit B can be freely inserted is also provided at the center of the base plate P.

When a groove is formed on the surface of the workpiece W with the trimmer T formed as described above, the base plate P is moved by moving the trimmer main body 1 in the vertical direction of the base 2.
The bit B is protruded from the lower end face by a desired length, and the cutting is performed with the cut depth set.

In this case, first, the trimmer T is slightly loosened on the flat smooth surface without unevenness so that the trimmer main body 1 can be easily moved up and down with respect to the base 2. Next, the pinion 4 is rotated by manually turning the position adjustment knob 42. By rotating the pinion 4, the trimmer main body 1 can be moved up and down by meshing with the rack 3 provided on the casing 11. Then, as shown in FIG. 1, the tip of the bit B is brought into contact with the smooth surface, and the trimmer main body 1 is moved so as to be flush with the lower surface of the base plate P. This position is the reference zero point.

Next, the scale color 5 provided at the base of the position adjusting knob 42 is rotated along the outer peripheral surface of the base to make the scale of "0" coincide with the reference mark 6.

Further, the bit B can be projected from the lower end surface of the base plate P by, for example, moving the trimmer T to the end of the smooth surface. Then, while checking the scale of the scale color 5, the position adjusting knob 42 is turned to lower the trimmer main body 1 with respect to the base 2 to a desired bit B projecting amount, and finally, the tightening screw 43 is tightened. The gripping portion 21 is tightened to the casing 11 of the trimmer T to determine the projecting amount of the bit B.

In the adjusting mechanism described above, the scale collar 5 is formed in a thin circular tube shape, and the scale collar 5 is provided on the outer periphery of the root portion of the position adjusting knob 42.
The present invention is not limited to this, and the scale collar 51 may be directly attached to the rotating shaft 41 as shown in FIGS.

In the adjusting mechanism shown in FIG.
Is provided in a thick circular tube, and the rotation shaft 41 of the pinion 4 penetrates the center portion thereof, and is attached by being pinched between the pinion attachment portion 61 and the position adjustment knob 44. One half of the scale collar 51 in the axial direction has an outer diameter slightly smaller and forms an insertion portion 511 to be inserted into the position adjustment knob 44. On the other hand, the position adjustment knob 44 is formed such that one side in the axial direction of the cylindrical body is convex. The convex portion has the same outer diameter as the outer diameter of the scale collar 51. At the center of the tip surface, two recesses are provided in the axial direction. The first-stage large-diameter recess is
The above-described insertion hole into which the insertion portion 511 of the scale collar 51 is inserted is a second-stage small-diameter concave portion through which the rotation shaft 41 of the pinion 4 is inserted.

As for the adjusting mechanism shown in this figure, the scale collar 51 can rotate only the scale collar 51 when the zero point is set, and the position adjusting knob when the trimmer body is moved with respect to the base. It is mounted to rotate with 44. In this case, the scale color 51
And the rotary shaft 41 may be relatively loosely fitted, and the insertion portion 511 of the scale collar 51 and the insertion hole 411 of the position adjustment knob 44 may be relatively tightly fitted.

In order to surely rotate the scale collar 51 when the position adjustment knob 44 is rotated, a non-slip member such as an O-ring is provided at a portion where the scale collar 51 and the position adjustment knob 44 are fitted. It may be provided (see FIG. 5).

In the embodiment described above, the graduation collar 5, which is a graduation member, is rotated in the circumferential direction with respect to the rotation shaft 41 to determine the position of the zero point. However, the present invention is not limited to this. Alternatively, the reference mark may be rotated in the circumferential direction. For example, although not shown in the drawing, a scale is provided on a peripheral edge of an end face of the position adjustment knob, and a reference mark is provided on a plane perpendicular to the axial direction of the rotation axis so as to be visible from the end face side of the position adjustment knob. May be formed so as to rotate about a rotation axis.

Conversely, a scale member is provided on the surface of the pinion mounting portion 212 of the base, a reference mark is provided on the rotation axis so as to correspond to the scale member, and the reference mark is rotated with the rotation axis. At least one of the member and the reference mark may be provided rotatably with respect to the rotation axis independently of the rotation axis.

Next, another embodiment of the present invention will be described with reference to FIGS.

In this embodiment, an elongated flat plate-like scale plate 7 having a scale engraved on the surface is provided on the grip 21 of the base 2, and the reference mark 6 indicating the scale of the scale plate 7 is provided with a trimmer T.
Is provided on the outer peripheral surface of the casing 11.

The base 2 is formed by molding a transparent resin material so that the reference mark 6 provided on the surface of the casing 11 can be visually checked even from outside the base 2. Further, on a part of the outer peripheral surface of the grip portion 21 of the base 2, a dovetail groove 23 having a bottom portion wider than the surface width is provided along the vertical direction. The scale plate 7 is provided so as to be able to slide along the dovetail groove 23 and to be inserted into the bottom of the dovetail groove 23.

On the other hand, on the surface of the casing 11, a reference mark 6 formed in the shape of an arrow is provided to indicate the scale engraved on the surface of the scale plate 7.

When adjusting the cutting depth by the adjusting mechanism shown in these figures, the tip of the bit B and the lower end face of the base plate P are flush with each other, as in the first embodiment. The trimmer body 1
Is moved downward with respect to the base 2 to protrude the bit B by a desired length, thereby adjusting the cut depth.

In this case, the zero point is determined by sliding the scale plate 7 along the dovetail groove 23 so that the “0” portion of the scale matches the position of the reference mark 6.

In the embodiment shown in the drawings, the scale plate is provided on the base 2 and the reference mark 6 is provided on the casing 11. However, the present invention is not limited to this. The reference mark 6 is attached to the casing 2
And the reference mark 6 may be formed slidably.

[0040]

As described above, according to the present invention, when adjusting the cutting depth by projecting a bit by a desired length, it is extremely easy without using a measuring instrument such as a scale or a caliper. In addition, the depth can be adjusted in a short time, and the efficiency of the operation can be improved.

Further, according to the first aspect of the present invention, it is possible to provide the scale at a position where the operator can easily check the scale, and it is not necessary to take an unreasonable system. Claims 2 and 3
According to the invention, since the position of the zero point of the scale can be set in advance, it is possible to prevent an error in adjusting the protruding length of the bit.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a trimmer provided with a cutting depth adjusting mechanism of the present invention.

FIG. 2 is a longitudinal sectional view showing one embodiment of a depth adjusting mechanism of the present invention.

FIG. 3 is a longitudinal sectional view showing another embodiment different from the depth adjusting mechanism shown in FIG. 2;

FIG. 4 is a longitudinal sectional view showing another embodiment different from the depth adjusting mechanism shown in FIG. 2;

FIG. 5 is a longitudinal sectional view showing another embodiment different from the depth adjusting mechanism shown in FIG. 4;

FIG. 6 is a front view of a trimmer provided with a depth adjusting mechanism according to another embodiment of the present invention.

FIG. 7 is a sectional view showing a section taken along line VII-VII of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Trimmer main body 11 Casing 2 Base 3 Rack 4 Pinion 41 Rotation axis 42,44 Position adjustment knob 43 Tightening screw 5,51 Scale color (scale member) 6 Reference mark 7 Scale plate B bit P Base plate T Trimmer

Claims (3)

[Claims] 1. A rack forming an outer shell of a trimmer main body is provided with a rack in an axial direction of the trimmer main body, and a pinion is provided on a base for gripping the trimmer main body so as to be movable in the axial direction, and the rack and the pinion are provided. In the trimmer cutting depth adjusting mechanism for adjusting the cutting depth of the bit by engaging the trimmer body in the axial direction with respect to the base by meshing, the scale indicating the cutting depth of the bit is circumferentially adjusted. Either a graduation member provided along the graduation member or a reference mark indicating a predetermined graduation of the graduation member corresponding to the graduation member is rotatably provided together with the rotation axis of the pinion, and the other is provided on the base. Trimmer cutting depth adjustment mechanism. 2. The cutting depth adjustment of a trimmer according to claim 1, wherein at least one of the scale member and the reference mark is rotatable in a circumferential direction independently of the rotation axis. mechanism. 3. A casing forming an outer shell of the trimmer main body,
A trimmer cutting depth adjusting mechanism that includes a base that grips the trimmer main body so as to be movable in the axial direction, and that adjusts the cutting depth of the bit by moving the trimmer main body in the axial direction with respect to the base. A scale plate extending in the axial direction of the trimmer is provided on one of the casing and the base, and a reference mark indicating a predetermined position of the scale plate is provided on the other, and at least one of the scale plate and the reference mark is provided. A trimmer cutting depth adjusting mechanism, wherein the trimmer can be moved in the axial direction.