JPH10296701A - Fine adjustment device of motorized tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a moving member and an adjust screw from jolting and consequently improve the accuracy of a device by a method wherein an external thread is provided at the middle part of the adjust screw, portions where the holes of a holding member are located are made to be an incomplete thread and the outer diameter at the tip part is made smaller than that at its middle part, and a locking member is fixed by pressure to the tip part of the adjust screw. SOLUTION: At the small diametral part at the tip of an adjust screw 8, a sleeve 14, in which an adjust screw inserting hole 14a having an inner diameter same in size as the outer diameter of the adjust screw, a threaded hole 14b normal to the hole 14a and a fixing screw 16 threadingly fitted to the hole 14b are mounted. By clamping the fixing screw 16 under the state that the small diametral part of the adjust screw 8 is inserted in the adjust screw inserting hole 14a of a sleeve 14, the adjust screw 8 is mounted to a device. No gap, which causes a hinge part and the adjust screw 8 to jolt each other, develops between the holes 7a and 7b and the adjust screw 8. When the sleeve 14 is mounted to the adjust screw 8 by clamping the fixing screw 16 under the condition that the adjust screw with its small diametral part inserted in the adjust screw inserting hole 14a and the sleeve are abutted against a bevel plate 7, no gap develops between the plate 7 and the screw and the sleeve, resulting in preventing a moving member and the adjust screw 8 from loosening and consequently allowing to improve the accuracy of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fine adjustment device for a power tool, which can finely adjust a moving member in the axial direction of the adjustment screw by rotating the adjustment screw. Hereinafter, the power tool will be described as a portable circle.

[0002]

2. Description of the Related Art An example of a portable round is shown in FIGS. As shown in the figure, a portable circular saw is a saw blade 21, a saw cover 1 covering the saw blade 21, a base 2 which is attached to the saw cover 1 and determines a cutting depth and serves as a reference when cutting.
2, the saw cover 1 and the base 22
They are connected via a link 23 provided on the upper surface and the bevel plate 7.

FIGS. 7 and 8 are enlarged views of the vicinity of the bevel plate 7. FIG. The saw cover 1 is provided with a hinge portion 2 having an internal thread 4, and the bevel plate 7 is provided with two holes 7 a and 7 b located on both sides of the hinge portion 2 on the same line as the internal thread 4. An adjusting screw 28 provided with a male screw that is screw-engaged with the female screw 4 is inserted into the holes 7 a and 7 b of the bevel plate 7 and the female screw 4 of the hinge part 2, and the saw cover 1 and the base 22 are connected. After the adjusting screw 28 is inserted through the female screw 4 and the holes 7a and 7b, a nut 29 is attached to the tip. The hinge portion 2 is provided with a screw hole 6 perpendicular to the axial direction of the adjusting screw 28, and the fixing screw 5 is inserted into the screw hole 6.

When the adjusting screw 28 is rotated, the hinge 2
Moves in the axial direction of the adjusting screw 28 between the hole 7a and the hole 7b of the bevel plate 7, that is, within a distance of X1-Y1.
The saw cover 1 and the saw blade 21 slightly rotate about the link 23 in the direction of the arrow shown in FIG. With such a configuration, the degree of parallelism between the saw blade 21 and the side surface of the base 22 can be adjusted by rotating the adjustment screw 28.

[0005]

In the above-described conventional fine adjustment device, since the external thread portion of the adjustment screw 28 is located in the hole 7a of the bevel plate 7, the holes 7a and 7b and the diameter accuracy are low. There is a high possibility that a gap is generated between the adjusting screw 28 and the hinge portion 2 and the adjusting screw 28. Also,
The retaining member attached to the tip of the adjusting screw 28 is a nut 29
Since the nut 29 is tightened with a tool such as a spanner, there is a high possibility that the nut 29 will be overtightened.
There is a disadvantage in that the rotation of the saw cover 1 and the rotation of the saw cover 1 about the adjustment screw 28 become heavy. If the nut 29 is not fastened sufficiently, the bevel plate 7
A gap is created between the nut 2 and the nut 29, and the hinge 2 and the adjusting screw 28 of the saw cover 1 rattle due to the gap.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fine adjustment device for an electric power tool which can solve the above-mentioned drawbacks, prevent rattling of a moving member and an adjusting screw, and improve accuracy.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to provide a screw at the center of an adjusting screw, making the portion where the hole of the holding member is located an incomplete screw, and making the tip end smaller than the outer diameter of the center. This is achieved by forming the outer diameter and pressing the retaining member against the tip of the adjusting screw.

[0008]

1 and 2 show one embodiment of the fine adjustment device of the present invention. As shown in the figure, the adjusting screw 8 has a large-diameter portion 8a having an outer diameter L, a medium-diameter male screw portion 8b having an outer diameter M,
The small diameter portion 8c having the outer diameter N is provided, and each outer diameter has a relationship of L>M> N, and the large diameter portion 8a and the small diameter portion 8c are incomplete threads. Accordingly, the hinge portion 2 of the saw cover 1 is provided with an elongated hole 3 having an inner diameter substantially equal to the outer diameter L of the large-diameter portion 8a of the adjusting screw 8, and a female screw 4 which is screw-fitted with the medium-diameter male screw portion 8b. Have been.

An adjustment screw insertion hole 14 having an inner diameter substantially equal to the outer diameter N of the small diameter portion 8c is provided in the small diameter portion 8c at the tip of the adjustment screw 8.
a, a sleeve 14 having a screw hole 14b orthogonal to the adjustment screw insertion hole 14a and a fixing screw 16 screwed into the screw hole 14b is attached. The sleeve 14 is attached to the adjusting screw 8 by tightening the fixing screw 16 with the small diameter portion 8c inserted into the adjusting screw insertion hole 14a. As described above, the large-diameter portion 8a and the small-diameter portion 8c of the adjusting screw 8 are incomplete screws, and the holes 7 of the bevel plate 7 are formed.
Since the configuration is such that the dimensional accuracy of the adjusting screw 8 located at the positions a and 7b can be increased, a gap is provided between the holes 7a and 7b and the adjusting screw 8 such that the hinge portion 2 and the adjusting screw 8 can rattle. Is not caused. Also,
Insert the small-diameter portion 8c into the adjustment screw insertion hole 14a and tighten the fixing screw 16 in a state where the small-diameter portion 8c is in contact with the bevel plate 7,
If the sleeve 14 is attached to the adjusting screw 8, it is possible to prevent a problem that the tightening of the adjusting screw 8 is excessive or a problem that a gap is generated between the adjusting screw 8 and the bevel plate 7 due to insufficient tightening. The rotation operation and the rotation of the saw cover 1 around the adjustment screw 8 are not made heavy, and the play of the hinge portion 2 and the adjustment screw 8 can be prevented.

FIGS. 3 and 4 show another embodiment of the fine adjustment device of the present invention. FIG. 3 shows a configuration in which a narrow portion 8c at the tip of the adjusting screw 8 and an adjusting screw insertion hole 14a of the sleeve 14 are provided with a two-sided width portion having the same shape.
It is possible to prevent the sleeve 14 from slipping inside the adjustment screw 8 due to excessive turning of the adjustment screw 8 and the sleeve 14 dropping off from the adjustment screw 8. FIG. 4 shows an outer shape of the sleeve 14 having a two-stage structure of a small diameter portion 14c and a large diameter portion 14d. In the embodiment shown in FIGS. 1 and 2, the bevel plate 7
Hole 7a is formed so as to have an inside diameter substantially equal to the outside diameter L of the large diameter portion 8a of the adjusting screw 8, and the hole 7b is formed with the outside diameter N of the small diameter portion 8c.
However, as shown in FIG. 4, the sleeve 14 is provided with a small-diameter portion 14c having an outer diameter substantially equal to the outer diameter L of the large-diameter portion 8a of the adjusting screw 8 as shown in FIG. If the small diameter portion 14c is inserted into the hole 7b,
The holes 7a and 7b of the bevel plate 7 can be formed to have the same inner diameter.

In the above embodiment, the adjusting screw 8 has a large-diameter portion 8a having an outer diameter L, a medium-diameter male screw portion 8b having an outer diameter M, and an outer diameter N
The outer diameter of the large-diameter portion 8a may be the same as the outer diameter M of the medium-diameter male screw portion 8b, and the same effect as in the above embodiment can be obtained. Can be. Although the fine adjustment device of the present invention has been described using a portable circular saw as the power tool, the power tool is not limited to the portable circular saw, and the fine adjustment device guides the cutting of the rotary blade and the rotary blade. However, the present invention is not limited to the adjustment of the degree of parallelism with the base side surface.

[0012]

As described above, according to the present invention, a screw is provided at the center of the adjusting screw, the portion where the hole of the holding member is located is formed as an incomplete screw, and the tip is formed from the outer diameter of the center. A small-diameter outer diameter and a configuration in which the retaining member is pressed against the tip end of the adjusting screw to prevent rattling of the moving member and the adjusting screw, and to provide a fine adjustment device for an electric tool capable of improving accuracy. Will be able to do it.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part showing an embodiment of a fine adjustment device of the present invention, and a side view showing an example of an adjustment screw.

FIG. 2 is a sectional view taken along line BB of FIG. 1;

FIG. 3 is an enlarged perspective view of a main part showing another embodiment of the fine adjustment device of the present invention.

FIG. 4 is an enlarged perspective view of a main part showing another embodiment of the fine adjustment device of the present invention.

FIG. 5 is a front view showing an example of this portable round.

FIG. 6 is a top view of the portable circle of FIG. 5;

FIG. 7 is an enlarged view of a part D in FIG. 6 showing an example of a conventional fine adjustment device.

FIG. 8 is a sectional view taken along line EE of FIG. 7;

[Explanation of symbols]

1 is a saw cover, 2 is a hinge portion, 3 is a long hole in the hinge portion, 4 is a female screw in the hinge portion, 5 is a fixing screw, 6 is a screw hole, 7 is a bevel plate, 7a and 7b are holes, and 8 is an adjustment. Screw, 14 is a sleeve, 14a is an adjustment screw insertion hole, 14
b is a screw hole, and 16 is a sleeve fixing screw.

Claims (4)

[Claims] 1. A moving member having a female screw inside, a holding member having at least two holes located on the same line as the female screw of the moving member and located on both sides of the female screw, and a female member of the moving member. It has an adjusting screw that can be inserted into the hole of the screw and the holding member, and a retaining member that is attached to the distal end of the adjusting screw that is inserted into the female screw and the hole. When the adjusting screw is rotated, the moving member is held. A fine adjustment device for a power tool which moves between holes of a member in the axial direction of an adjustment screw, wherein a screw is provided at a central portion of the adjustment screw, and a portion where the hole of the holding member is located is an incomplete screw. A fine adjustment device for an electric tool, wherein the tip portion has an outer diameter smaller than the outer diameter of the central portion, and a retaining member is crimped to the tip portion of the adjusting screw. 2. A screw hole orthogonal to the axial direction of the adjusting screw is provided on the retaining member, and a fixing screw is screwed into the screw hole, and the retaining screw is crimped to the tip of the adjusting screw by the fixing screw. The fine adjustment device for a power tool according to claim 1, wherein: 3. The fine adjustment device for a power tool according to claim 1, wherein a two-sided width portion having the same shape is provided in the adjustment screw tip portion and the adjustment screw insertion hole of the retaining member. 4. The device according to claim 1, wherein the retaining member has a two-stage structure of a small diameter portion and a large diameter portion, and the small diameter portion is inserted through a hole of the holding member. 2. The fine adjustment device for an electric tool according to claim 1.