JP2000317802A - Orbital sanding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unevenness in a polished surface of a work piece by providing at least two eccentric shafts for causing the eccentric movement of a pad in parallel. SOLUTION: A that countersunk head screw 28 is positioned to the eccentric position to the center of each of through holes 31 formed in the front part and in the rear part of a pad 30, and the shaft center of a grip part 2 is positioned in parallel to the longitudinal center line of the pad 30. The front part and the rear part of the pad 30 are fitted to two eccentric shafts 14, 18 disposed with a vertical line passing the center of gravity of the pad 30 sandwiched between them at equal spaces to locate the center of the grip part 2 on the vertical line. Therefore, the stable eccentric movement of the pad 30 can be secured by two eccentric shafts 14, 18, and the bias of force applied to the pad 30 through the grip part 2 having the center located on the vertical line and the main body 1 is eliminated to equally apply the vertical pressing force to the pad 30, so that the pad 30 is abutted in the stable state to a polished surface of the work piece to prevent the occurrence of unevenness in the polished surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an orbital sander for sanding a workpiece such as wood or iron plate.

[0002]

2. Description of the Related Art In a conventional orbital sander of this type, an orbital sander main body is provided with one eccentric shaft in a vertical direction, and a lower part of the main body is provided with a horizontal pad mounted on the eccentric shaft and eccentrically moving. ing. A plurality of feet made of an elastic member are arranged between the pad and the main body,
A grip portion of the main body is provided to protrude rearward of the main body.
And, during sanding work, hold the grip of the main body,
The main body is pressed against a polished surface of a workpiece such as wood or an iron plate, and a pad is pressed against the polished surface of the workpiece.

[0003]

As described above, in the case of the conventional orbital sander, since the pad is eccentrically moved by one eccentric shaft, the force applied to the pad via the grip portion and the main body is biased. The pad easily contacts the polished surface of the workpiece in a very unstable state.

[0004] Further, since the gripping portion protrudes rearward of the main body and the gripping portion and the pad are separated from each other back and forth, a bias is applied to the force applied to the pad during the sanding operation.

For example, when the grip at the rear of the main body is pressed, the foot at the rear of the pad bends and the rear of the pad moves in an elliptical motion close to a linear motion. , Uneven eccentric movement of the pad,
There is a problem that unevenness occurs on the polished surface of the workpiece.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an orbital sander that can evenly apply a force to a pad and eliminate unevenness in a polished surface of a workpiece.

[0007]

In order to solve the above-mentioned problems, an orbital sander according to a first aspect of the present invention comprises an orbital sander body 1 having eccentric shafts 14 and 18 for eccentrically moving a pad 30 in parallel. At least two are provided.

Therefore, the orbital sander body 1
Since at least two eccentric shafts 14 and 18 for eccentrically moving the pad 30 are provided, the pad 30 is eccentrically moved by two or more eccentric shafts 14 and 18, and the pad 30 is processed in a stable state. It is effective in contacting the polished surface of the material to eliminate unevenness in the polished surface of the workpiece.

In the orbital sander according to the present invention, one of the eccentric shafts 14 and 18 is rotated by the rotation of the drive shaft 4, and the rotational force of the eccentric shaft 14 rotated by the drive shaft 4. Is transmitted to the remaining eccentric shafts 18.

Therefore, a plurality of eccentric shafts 14, 18 are provided.
Is rotated by the rotation of the drive shaft 4 of the motor 3, and the rotational force of the eccentric shaft 14 rotated by the drive shaft 4 is
Since the rotational force transmitting means 20 for transmitting the remaining eccentric shafts 18 is provided, one of the plurality of eccentric shafts 14 and 18 is rotated by rotation of the drive shaft 4 of the motor 3, and this rotation causes the drive shaft 4 to rotate. The rotational force is transmitted through the rotational force transmitting means 20 to the remaining eccentric shaft.
The remaining eccentric shaft 18 is linked to the drive shaft 4.

An orbital sander according to a third aspect of the present invention comprises a horizontal pad on a lower portion of the orbital sander body 1.
In an orbital sander provided with 30, a grip portion 2 of the main body 1 is provided above a center portion of the pad,
A motor 3 is provided in the grip portion 2 in a horizontal direction.

Therefore, above the center of the horizontal pad 30 provided at the lower part of the orbital sander main body 1,
Since the grip 2 of the main body 1 is provided, the pad 30 is
By pressing the pad 30 from above, a force is uniformly applied to the pad 30 in the direction perpendicular to the polished surface of the workpiece. Moreover, since the motor 3 is provided in the grip portion 2 in the horizontal direction, the grip portion can be effectively used as a storage space for the motor.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS. First Embodiment First, a first embodiment will be described with reference to FIG. In the figure, orbital sander A is
The orbital sander has a main body 1, a grip portion 2 of the main body 1 having a substantially U-shaped cross section, and a quadrangular pad 30 provided in a lower portion of the main body 1. Reference numeral 3 denotes a motor provided on the grip portion 2, and 4 denotes a drive shaft of the motor 3 in the front-rear direction, and bearings 5 provided on the front and rear portions of the main body 1.
It is rotatably supported by. A cooling fan 6 for the motor 3 provided on the drive shaft 4 is located behind the front bearing 5. Reference numeral 7 denotes a pinion gear provided at the tip of the drive shaft 4, which is located in front of the front bearing 5. Reference numeral 8 denotes a vertical main output shaft provided at a front portion of the main body 1, and has an upper end portion rotatably supported by a bearing 9 and a lower end portion by a bearing 10. 1
1 is a bevel gear fixed to the upper part of the main output shaft 8,
The rotation direction of the drive shaft 4 of the motor 3 is changed by meshing with the pinion gear 7.

Reference numeral 12 denotes a first support shaft protruding from a lower end of the main output shaft 8, 13 denotes a first pulley press-fitted into the first support shaft 12,
Reference numeral 4 denotes a main eccentric shaft formed integrally with the first pulley 13, and the axis of the main eccentric shaft 14 is eccentric with respect to the axis of the first support shaft 12. Then, the main eccentric shaft 14 is rotated by transmitting the torque of the drive shaft 4 of the motor 3 to the main output shaft 8 via the pinion gear 7 and the bevel gear 11.

Reference numeral 15 denotes a vertical auxiliary output shaft provided at the rear portion of the main body 1. Both ends are rotatably supported by small bearings 15 a and large bearings 15 b, and the auxiliary output shaft 15 is attached to the main output shaft 8. The output shafts 8 and 15 are disposed in parallel with each other, and are dispersed on the center line of the pad 30 in the front-rear direction. The dispersion means that the pads 30 are arranged at equal intervals across a vertical line passing through the center of gravity of the pads 30. Reference numeral 16 denotes a second support shaft protruding from a lower end of the auxiliary output shaft 15. As with the first support shaft 12, a second pulley 17 is press-fitted, and an auxiliary eccentric shaft 18 is formed integrally with the second pulley 17. The axis of the auxiliary eccentric shaft 18 is eccentric with respect to the axis of the second support shaft 16. Reference numeral 19 denotes a belt wound around both pulleys 13 and 17, and the rotational force of the main eccentric shaft 14 is transmitted to the second pulley 17 via the first pulley 13 and the belt 19,
The auxiliary eccentric shaft 18 rotates. 20 is both pulleys 13 and 17
And a belt 19 for transmitting torque.

Reference numeral 21 denotes a rectangular base provided in the lower part of the main body 1 in a plan view, and 22 denotes two bulging portions respectively formed on a front portion and a rear portion of the base 21 on a center line in the front-rear direction.
Reference numeral 3 denotes a concave portion formed in the bulging portion 22, and reference numeral 24 denotes an annular mounting portion formed on the wall surface of the concave portion 23. Bearings 25 are provided on both mounting portions 24, and the eccentric shafts 14, 18 are provided by the bearing 25. Are rotatably supported.
26 is a through hole formed in the bottom of the recess 23, 27
Is a disk-shaped mounting plate, and a flat head screw 28 penetrates through the center of the mounting plate 27 and is screwed into the ends of both the support shafts 12 and 16. 21 is attached to both support shafts 12 and 16. In such a case, as described above, since the output shafts 8 and 15 are arranged at equal intervals with a vertical line passing through the center of gravity of the pad 30 interposed therebetween, the base 21 is stabilized by the support shafts 12 and 16. Do eccentric exercise in the state of doing. Reference numeral 29 denotes a paper clamp provided on the front part and the rear part of the base 21.

Numeral 31 denotes through holes formed in the front and rear portions of the pad 30. The flat head screw 28 is located at a position eccentric with respect to the center of the through hole 31. On the other hand, the axis of the grip part 2 is located in parallel. The front and rear portions of the pad 30 are attached to two eccentric shafts 14 and 18 that are arranged at equal intervals with a vertical line passing through the center of gravity of the pad 30 interposed therebetween. Since the center is located, the pad 30 can be easily pressed in the direction perpendicular to the polishing surface by holding the grip portion 2 with one hand, and the force can be easily applied to the pad 30 evenly. A polishing paper (not shown) is detachably attached to the lower surface of the pad 30 by a paper clamp 29.

Reference numeral 32 denotes a dust collection port formed in the lower rear portion of the main body 1, reference numeral 33 denotes an L-shaped dust collection path, one end of which is a dust collection port 32.
, And the other end is located in a communication hole 34 formed in the rear part of the base 21. Then, dust generated during the polishing operation is discharged to the outside through the communication hole 34, the dust collection path 33, and the dust collection port 32. Reference numeral 35 denotes a power cord connected to the main body 1.

Next, the operation will be described. When the drive shaft 4 of the motor 3 is rotated from the state shown in the figure, the main eccentric shaft 14 is rotated via the pinion gear 7, the bevel gear 11, the main output shaft 8 and the first pulley 13, and also via the belt 19 and the second pulley 17. The rotational force of the drive shaft 4 is transmitted to the auxiliary eccentric shaft 18 to rotate the auxiliary eccentric shaft 18, and the two eccentric shafts 14,
The rotation of 18 causes the pad 30 to move eccentrically.

The user holds the grip 2 of the main body 1 and presses the main body 1 in a direction perpendicular to the center of the pad 30 so that the pad 30 is pressed against the polished surface of the workpiece such as wood or iron plate. Sanding. In this case, the pad 30 is not attached to one eccentric shaft as in the related art, but is attached to the two eccentric shafts 14 and 18 as described above. Eccentric exercise.
In addition, since the two eccentric shafts 14 and 18 are arranged at equal intervals on a vertical line passing through the center of gravity of the pad 30, a stable eccentric movement of the pad 30 can be ensured. Further, since the center of the grip portion 2 is located on the vertical line, the force applied to the pad 30 via the grip portion 2 and the main body 1 is not biased, and the pressing force in the vertical direction is reduced.
And the pad 30 abuts on the polished surface of the workpiece in a stable state, which is effective in eliminating the unevenness of the polished surface. Further, the user can easily operate the main body 1 by holding the grip portion 2 with one hand.

The dust generated during the sanding operation passes through the communication hole 34 of the base 21, passes through the dust collection path 33 of the main body 1, and is collected from the dust collection port 32 by a dust collector (not shown) provided outside. Is done.

In the above embodiment, two eccentric shafts are rotated by one motor, but both eccentric shafts may be individually rotated by two motors. However, if a plurality of motors are provided in the main body, the main body becomes large. Therefore, it is preferable that one motor rotates a plurality of eccentric shafts. Further, the number of the eccentric shafts is two, but may be three or more.

Further, the two eccentric shafts are arranged on the center line in the front-rear direction of the pad, but both eccentric shafts may be arranged at the center of the pad. However, in order to uniformly apply a force to the pad in the vertical direction, it is preferable to disperse the eccentric axes at equal intervals across a vertical line passing through the center of gravity of the pad, and satisfying this condition, A plurality of eccentric axes may be dispersedly arranged on the center line in the left-right direction of the pad or on the diagonal line. Further, the shape of the pad is not limited to a square, but may be a triangle, a circle, an ellipse, or the like.

Further, the shape of the grip portion is U-shaped in cross section. However, the grip portion may have an L-shaped cross section, or may be a grip portion having a handle having a cross shape, a single character shape, or the like.
In short, the grip portion may have any shape as long as its center portion is located on the vertical line and a force is applied uniformly to the main body in the vertical direction with respect to the center portion of the pad. However, in the case of the above-described embodiment, since the pad is supported by the two eccentric shafts, the position and shape of the grip portion are not limited, but the above-described position and shape are preferably more effective.

Furthermore, although the rotational force transmitting means is composed of a pulley and a belt, it may be composed of a plurality of gears, as long as a plurality of eccentric shafts are linked.

Although the motor 3 is provided on the grip portion 2 of the main body 1 in the front-rear direction, the present invention is not limited to this, and the motor 3 may be provided on the main body 1 in the vertical direction. In addition, since the grip 2 is used as a storage space for the motor 3, a small orbital sander having no dead space can be produced by effectively utilizing the grip 2.

<Second Embodiment> Next, a second embodiment will be described with reference to FIG. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding elements, and the differences are as follows.

The first pulley 13 press-fitted into the first support shaft 12 of the main output shaft 8 does not have the main eccentric shaft 14 and the auxiliary output shaft 15
Is provided substantially at the center of the pad 30 and extends along the axis of the auxiliary output shaft 15, that is, on the vertical line passing through the center of gravity.
, And the first pulley 13 and the second pulley 17 of the auxiliary output shaft 15 are connected by a belt 19. On the other hand, the bulging portion 22 is provided at the center of the base 21, and the auxiliary eccentric shaft 18 of the second pulley 17 is rotatably supported by the bearing 25 of the mounting portion 24. A plurality of flexible feet 36 are provided at the front and rear of the main body 1. Each foot 36 has its upper end supported by the main body 1 and its lower end supported by the base 21. Further, the base 21 is attached to the auxiliary eccentric shaft 18 via the attachment plate 27 by the flathead screw 28, and the attachment screw 38 inserted through the insertion hole 37 of the pad 30 penetrates the base 21 to the lower end of each foot 36. Screw into pad 3 on base 21
0 is attached.

Next, the operation will be described. Motor 3
When the drive shaft 4 rotates, the first pulley 13 rotates via the pinion gear 7, the bevel gear 11, and the main output shaft 8, and the eccentric shaft 18 rotates via the rotational force transmitting means 20 and the second pulley 17. The pad 30 moves eccentrically by the rotation of the eccentric shaft 18.

Then, the user holds the grip 2 of the main body 1 and presses the main body 1 in a direction perpendicular to the center of the pad 30 to press the pad 30 against the polished surface of a workpiece such as wood or iron plate. Sanding. In this case, the pad 30 is connected to the auxiliary output shaft 15 provided substantially at the center of the orbital sander main body 1.
, And supported by the plurality of feet 36, the deflection of the forces due to the bending of the plurality of feet 36 is reduced. Further, the center of the gripper 2 is
, The force applied to the pad 30 is applied substantially uniformly in the vertical direction, and the unevenness of the polished surface is eliminated.

[0031]

As described above, according to the first aspect of the present invention,
In the described orbital sander, at least two eccentric axes are provided in parallel, so that the pad is eccentrically moved by the plurality of eccentric axes, which is effective for eliminating unevenness in the polished surface of the workpiece.

According to a second aspect of the present invention, there is provided an orbital sander, wherein one of the plurality of eccentric shafts is rotated by a drive shaft of a motor, and the rotational force of the eccentric shaft rotated by the drive shaft of the motor is transmitted by a torque transmitting means. As a result, a plurality of eccentric shafts can be rotated by one motor. Therefore, the orbital sander body can be easily reduced in size, and the above-described orbital sander can be easily configured at low cost.

In the orbital sander according to the third aspect of the present invention, the orbital sander main body is provided with a grip portion above the center of the pad, and the motor is provided in the grip portion in a horizontal direction. , A force in the vertical direction can be applied to the pad, and the force can be easily applied evenly to the pad. Moreover, since the motor is provided in the grip portion in the horizontal direction, the grip portion can be effectively used as a storage space for the motor, and the size of the main body can be reduced.

[Brief description of the drawings]

FIG. 1 is a cut-away side view of a first embodiment of the present invention.

FIG. 2 is a cut-away side view of a second embodiment of the present invention.

[Explanation of symbols]

1: Orbital sander body, 2: gripping part, 3: motor,
4 drive shaft, 14 eccentric shaft, 18 eccentric shaft, 20 rotational force transmitting means, 30 pad.

Claims (3)

[Claims] An orbital sander body (1) and a motor (3)
An orbital sander in which an eccentric shaft interlocked with the rotation of the drive shaft (4) is provided, and a pad (30) eccentrically moved by the rotation of the eccentric shaft is attached to the eccentric shaft. An orbital sander comprising at least two (18) provided in parallel. 2. One of said eccentric shafts (14) and (18) is rotated by rotation of said drive shaft (4), and said drive shaft (4)
2. The orbital sander according to claim 1, further comprising a torque transmitting means (20) for transmitting the torque of the eccentric shaft (14) rotated by (1) to the remaining eccentric shafts (18). 3. An orbital sander in which a horizontal pad (30) is provided at a lower portion of an orbital sander main body (1), wherein the main body (1) is provided above a center portion of the pad (30).
An orbital sander comprising: a grip portion (2); and a motor (3) provided in the grip portion (2) in a horizontal direction.