JPH07285020A - Circular sawing machine - Google Patents

Abstract

PURPOSE:To improve operativity of an oscillating part, and retentive precision of an arm. CONSTITUTION:A cylinder 72 installed in a supporting member is arranged opposedly to a cylinder 71 arranged in a main supporting link 10. A shaft 9, which is inserted into the cylinder 72, is fitted in the cylinder 71. Ball receiving parts 72a, 72a are arranged in the cylinder 72. Plural steel balls 73 are arranged between one of the ball receiving parts 72a, 72a and a ball receiving part 9a of the shaft 9. A nut 74 is screwed in the shaft 9, and in the nut 74, a ball receiving part 74a is formed opposedly to the other ball receiving part 72a. Plural steel balls 75 are arranged between the ball receiving part 74a and the ball receiving part 72a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular saw machine, and more particularly to a circular saw machine in which an arm portion is swung through a hinge portion.

[0002]

2. Description of the Related Art Generally, as a cutting machine, a circular saw machine for rotating a circular saw blade for cutting is widely known. FIG. 10 is a side view showing a conventional circular saw machine. Reference numeral 101 in the drawing is a base, and a turntable 104 is provided on the base 101.
Is rotatably provided. Also, turntable 1
A holder 107 is attached to the holder 04.
The guide bar 111 is slidably inserted in the through hole 107a in the axial direction. A circular saw support portion 113 holding a circular saw blade 117 is swingably provided on one end side of the guide bar 111 via a hinge shaft 114. In order to improve the accuracy of the hinge portion, the hinge shaft 114 is tightened with a nut more firmly.

[0003]

However, if the hinge shaft is tightly tightened with a nut, friction between the circular saw support portion and the guide bar is increased and the operability is deteriorated. If the tightening is weakened, the holding accuracy of the arm is reduced. There is a problem that it gets worse.

The present invention has been made in view of the above-mentioned problems, and provides a circular saw machine which can improve the operability by reducing the friction and the holding accuracy of the arm. With the goal.

[0005]

According to the present invention, there is provided a joint portion formed on a base portion, a swing member swingably provided on the joint portion via a shaft, and a swing member provided on the swing member. A circular saw blade provided with a circular saw blade and a nut for integrally fixing the swing member to the joint by being screwed onto the shaft. One of which is fitted with the shaft, and the other is provided with a first bearing interposed between the shaft and the second bearing, and a second bearing interposed between the nut, and is rotatable with respect to the shaft. Being clamped and held; a joint formed on the base, a swing member swingably mounted on the joint via a shaft, and a circular saw blade provided on the swing member And the rocking portion at the joint by being screwed onto the shaft. In a circular saw machine provided with a nut for integrally fixing a joint, a bearing is provided on an opposing surface on which the joint portion and the swing member swing, and either the joint portion or the swing member is provided. One is movable in the axial direction of the shaft by a stopper pin and its rotation is restricted, and the nut is arranged on the side where the stopper pin is provided.

[0006]

In the circular saw machine according to the first aspect, when the shaft is fitted to the swinging member, the first bearing is interposed between the joint and the shaft, and the first bearing is interposed between the joint and the nut. The shaft is rotatably provided with respect to the joint by the second bearing, and the joint is held between the first and second bearings by tightening the nut. Therefore, when the rocking member rocks, the shaft rotates, but since the joint is held by the bearing, it is possible to reduce the frictional resistance due to the rolling motion of the bearing and increase the holding accuracy of the rocking member. You can

In the circular saw machine according to the second aspect, when the stopper pin is provided on the swinging member side, the shaft is prevented from slipping off at the joint side and is rotatable. On the oscillating member side, a stopper pin provided on the shaft contacts the oscillating member to prevent the oscillating member from rotating with respect to the shaft, but the oscillating member does not move in the axial direction with respect to the shaft. Since it is formed so that the rocking member can be moved to the joint side by tightening the nut. When the rocking member is rocked in this state, the shaft does not rotate with respect to the rocking member due to the stopper pin, but the shaft rotates with respect to the joint on the joint side.
At this time, since the bearing is provided on the sliding surface between the rocking member and the joint, the frictional resistance is small, and the nut is provided on the rocking member side. Since the nut does not slide, the nut does not loosen and the rocking member holding accuracy can be maintained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of a circular saw machine according to the present invention. In the figure, reference numeral 1 is a base, and a turntable 2 is rotatably provided on the base 1. A support member 8 is provided on the pivot 2 a of the rotary table 2 via a shaft 7. This support member 8 has a shaft 9
One end of the main support link 10 is rotatably provided via the. A support arm 13 is rotatably provided at the other end of the main support link 10 via a shaft 12. A circular saw blade 15 is attached to an appropriate position of the support arm 13 via a rotary shaft 14. In addition, the coil spring 17
Is interposed between the support member 8 and the main support link 10, and urges the main support link 10 counterclockwise in the figure.

FIG. 2 is a view showing a joined state of the support member 8 and the main support link 10. That is, the main support link 10
The right half of the shaft 9 in the figure is fitted into the cylinder 71 provided in the. In the left half of the shaft 9 in the figure,
A cylinder 72 provided on the support member 8 is provided so as to face the cylinder 71. The cylinder 72 has annular ball receiving portions 72a, 72a formed at two locations, and a plurality of ball receiving portions 72a (right side in the drawing) and the ball receiving portion 9a of the shaft 9 are provided with a plurality of balls. Steel balls 73, 73, ... (FIG. 3) are interposed. Also,
A nut 74 is screwed on the left side of the shaft 9 in FIG. 2, and a ball receiving portion 74a is formed on the nut 74 so as to face the other ball receiving portion 72a (left side in the figure) of the cylinder 72. There is. Then, the ball receiving portion 74a of the nut 74 and the ball receiving portion 72a of the cylinder 72.
A plurality of steel balls 75, ... Are interposed between and. A nut 76 is provided on the right side of the shaft 9 in the drawing,
Further, locking nuts 77 are screwed onto the left side of the nut 74 in the figure.

The main support link 1 has the same structure.
0 and the support arm 13 are supported by the shaft 12. The operation of the circular saw machine thus configured will be described.

First, the workpiece 18 is placed on the rotary table 2 and positioned and fixed. And the support arm 1
The gripping portion 13b of No. 3 is gripped and the support arm 13 is moved to the right in the drawing (FIG. 4). At this time, the main support link 1
0 rotates clockwise about the shaft 9 in the figure, and the support arm 13 rotates counterclockwise around the shaft 12 in the figure. The rotation operation here will be described with reference to FIG. 2. Since the cylinder 71 is fixed to the shaft 9, the cylinder 71 rotates integrally with the shaft 9 with respect to the cylinder 72. At this time, the outer peripheral surfaces of the cylinder 71 and the cylinder 72 are joined, but since the steel balls 73, ... Are rotatably interposed, the frictional resistance between the cylinder 71 and the cylinder 72 is reduced, and the main support link 10 Can be swung smoothly. Further, the steel balls 7 are also provided between the ball receiving portion 74a of the nut 74 and the ball receiving portion 72a of the cylinder 72.
Since nuts 5, ... are rotatably interposed, the nut 7
The frictional resistance between 4 and the cylinder 72 can also be reduced. This improves the operability and the holding accuracy of the arm. It should be noted that the same operation can be expected between the main support link 10 and the support arm 13 around the shaft 12 by using the same configuration. Further, while the work piece 18 is cut by the circular saw blade 15, the circular saw blade 15 is moved to the left in the figure (FIG. 5). That is,
The main support link 10 rotates about the shaft 9 in the counterclockwise direction in the figure, and the support arm 13 also rotates the shaft 1.
It rotates in the clockwise direction in the figure with 2 as the center. At this time,
The biasing force of the coil spring 17 allows the operator to rotate the main support link 10 without requiring a large force. Further, even during this moving operation, since the steel balls 73 and the steel balls 75 are in rolling motion during swing,
The frictional resistance can be reduced, and the operability and the holding accuracy of the arm can be improved.

Next, referring to FIG. 1, when cutting a work piece 19 having a short cutting length, an operator grips the supporting portion 13b of the supporting arm 13 to attach the main supporting link 10 to the shaft 9 Rotate clockwise around in the figure. At this time, the support arm 13 is prevented from rotating with respect to the main support link 10. In this state, the work piece 19 is cut by the circular saw blade 15. Even during this cutting operation, when the main support link 10 swings, the steel balls 73
Since it is the rolling motion of the steel ball 75, the frictional resistance can be reduced and the operability can be improved.

In the above embodiment, the case of the slide type circular saw machine has been described. However, the slide type circular saw machine is not always necessary and a normal circular saw machine may be used. Further, in the above-described embodiment, the main support link 10 and the support arm 1 are provided between the support member 8 and the main support link 10.
Although the hinge portion in the present invention is formed at both positions between the support member 8 and the main support link 10, it may not be necessarily provided at both positions.

FIG. 6 shows a supporting member 8 of the circular saw machine according to the present invention.
It is a figure which shows the other joining state of the main support link 10.
Reference numeral 84 in the figure denotes a cylinder provided on the main support link 10, and a shaft 82 is mounted on the cylinder 84 in a state in which rotation is restricted by a pin 83 as shown in FIG. A cylinder 81 provided in the support member 8 is inserted in the left half of the shaft 82 in the figure. At this time, the cylinder 81 is rotatably held around the shaft 82. A nut 85 is screwed onto the shaft 82, and ball contact portions 81a and ball contact portions 84a are formed annularly on the contact surface portions of the cylinder 81 and the cylinder 84, which face each other. . The steel balls 87, 87, ... Held by the annular ball support member 86 as shown in FIG. 9 are held in contact with the ball abutting portions 81a, 84a in FIG. Further, on the contact surface portion between the cylinder 81 and the protruding portion 82a of the shaft 82, annularly formed metals 88, 88 are provided. The metal 88 may be a bearing. Further, as shown in FIG. 7, the pin 83 may be inserted into the cylinder 81 to restrict the rotation of the shaft 82.

When the hinge portion is constructed as described above, when the main support link 10 swings around the shaft 82, the cylinder 84 and the cylinder 81 roll by the steel ball 87, and the cylinder 84 swings. Since it moves, the frictional resistance when the main support link 10 swings can be reduced, which in turn can improve the operability and the holding accuracy of the arm. Particularly in this embodiment,
Since the rotation of the cylinder 84 and the shaft 82 is completely restricted, the nut 85 does not rotate together with the cylinder 81, so that the nut 85 can be prevented from loosening.

[0016]

As described above, according to the present invention, even if the nut is firmly tightened to the shaft, the frictional resistance of the hinge portion can be reduced, thereby improving the operability and holding the arm. This has the effect of improving the accuracy.

[Brief description of drawings]

FIG. 1 is a side view of a circular saw machine according to the present invention.

FIG. 2 is a view showing a joint between a support member and a main support link of a circular saw machine according to the present invention.

FIG. 3 is a diagram showing a relationship between a shaft and a steel ball of a circular saw machine according to the present invention.

FIG. 4 is a side view of the circular saw machine according to the present invention.

FIG. 5 is a side view of the circular saw machine according to the present invention.

FIG. 6 is a view showing another embodiment of the joint between the supporting member and the main supporting link of the circular saw machine according to the present invention.

FIG. 7 is a diagram showing another embodiment of the joint between the support member and the main support link of the circular saw machine according to the present invention.

FIG. 8 is a perspective view showing a state where a shaft is fixed to a cylinder.

FIG. 9 is a view showing a holding state of a steel ball.

FIG. 10 is a side view of a conventional circular saw machine.

[Explanation of symbols]

 9 ... Shaft 71 ... Cylinder 72 ... Cylinder 73 ... Steel ball 74 ... Nut 75 ... Steel ball 81 ... Cylinder 82 ... Shaft 84 ... Cylinder 87 ... Ball 88 ... Metal

Claims (2)

[Claims] 1. A joint portion formed on a base, a swing member swingably provided on the joint portion via a shaft, a circular saw blade provided on the swing member, and In a circular saw machine provided with a nut for integrally fixing the swing member to the joint portion by screwing the shaft, one of the joint portion and the swing member is fitted with the shaft. However, the other includes a first bearing interposed between the shaft and the second bearing, and a second bearing interposed between the nut, and is rotatably clamped and held with respect to the shaft. Characteristic circular saw machine. 2. A joint portion formed on a base, a swing member swingably provided on the joint portion via a shaft, a circular saw blade provided on the swing member, and In a circular saw machine provided with a nut for integrally fixing the swing member to the joint portion by screwing the shaft, a bearing is provided on a surface on which the joint portion and the swing member swing. One of the joint portion and the swing member is movable in the axial direction of the shaft by a stopper pin and rotation is restricted, and the nut is arranged on the side where the stopper pin is provided. A circular saw machine characterized by that.