JP4061053B2 - Electric sander - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric sander that applies a predetermined motion to a pad by rotation of a motor and polishes an object to be polished with an abrasive such as siding paper mounted on the pad.
[0002]
[Prior art]
Conventionally, there is an electric sander (hereinafter referred to as a sander) as an electric tool for polishing a surface of a material to be polished, for example, a metal surface to remove rust or smoothing the surface. The sander includes a random sander (also referred to as a rotary sander) in which the pad rotates simultaneously with an eccentric motion via an eccentric shaft connected to the rotation shaft of the motor, and a circular motion on a plane with the pad eccentrically rotated. There is an orbital sander that does not, and it is properly used depending on the material of the material to be polished and applications such as rough polishing to finish polishing.
[0003]
As shown in the structural diagram of FIG. 5, the conventional random sander 100 has a motor 102 built in a frame 103, and a rotating shaft 104 is rotatably supported by ball bearings 105, 106 provided above and below the frame 103. ing.
[0004]
A bearing holder 108 that is eccentric from the center O of the rotating shaft 104 by an eccentric amount D is connected to the tip of the rotating shaft 104, and an eccentric shaft 110 is mounted via an internal ball bearing 109. An abrasive 112 such as siding paper is fixed to the eccentric shaft 110 with a screw 113 through a pad 111. A dust fan 114 is provided on the outer periphery of the bearing holder 108.
[0005]
Further, the eccentric shaft 110 can be used with a rubber pad and disc paper attached thereto.
[0006]
When the motor 102 is driven, the bearing holder 108 eccentric with respect to the rotating shaft 104 rotates, and at the same time, the pad 111 connected to the eccentric shaft 110 through the bearing 109 is interlocked with the rotating shaft 104 with an eccentric amount D. The material to be polished is polished by the polishing material 112 mounted on the pad 111 by rotating while being eccentric.
[0007]
At the same time, the dust fan 114 rotates, sucks the dust generated by the polishing operation, collects the dust in the dust bag 116 attached to the frame 103 through the dust collection hole 115, and discharges the filtered air. Also, the brake ring 117 provided around the lower side of the frame 103 is an elastic body made of rubber or synthetic resin, and it makes contact with the pad 111 to provide rotational resistance. The pad 111 suddenly rotates when the motor is started. And it suppresses inertial rotation when the power is turned off.
[0008]
Further, as shown in the partial structure diagram of the pad moving part in FIG. 6, the conventional orbital sander 200 has a motor driving part similar to the random sander 100 (not shown in FIG. 6), and a motor 202 is built in the frame 203. The rotation shaft 204 is rotatably supported by ball bearings 206 (upper bearings are not shown) provided on the upper and lower sides of the frame 203.
[0009]
An eccentric shaft 208 that is eccentric with respect to the rotation shaft 204 is connected to the tip of the rotation shaft 204, and a dust fan 209 is provided on the outer periphery of the eccentric shaft 208.
[0010]
A rectangular plate 211 having a ball bearing 210 at the center is attached to the lower end of the rotating shaft 208 by a fixing plate 214 and a screw 215 so as to be rotatable with respect to the eccentric shaft 208 via the bearing 210.
[0011]
In addition, the plate 211 is connected to a support portion 207 provided at the lower part of the frame 203 by pillars 216 made of an elastic body such as urethane rubber and arranged at the four corners of the plate 211 around the eccentric shaft 208. Yes.
[0012]
By driving the motor 202, the plate 211 tries to rotate eccentrically with respect to the rotating shaft 204 in conjunction with the rotation of the eccentric shaft 208, but the four corners are attached to the support columns 216 made of an elastic body connected to the frame 203. The rotational motion is constrained, and the plate 211 performs a vibration motion by drawing a circle on a flat surface in small increments. Abrasive material 213 such as siding paper mounted on a pad 212 provided on the lower surface of the plate 211 is used to polish the material to be polished. Can be polished.
[0013]
The dust generated by the polishing operation is sucked by the dust fan 209 that rotates simultaneously, passes through the dust collection hole 217, and is collected in the dust bag 218.
[0014]
In the conventional polishing work, the above two types of sanders are used properly depending on the material of the material to be polished, the shape of the polished surface, roughing to finish polishing, glossing, etc. Since the sander was replaced each time, there was a problem that work time was wasted and there were a lot of accessory parts such as abrasives, which required maintenance, management and cost.
[0015]
[Problems to be solved by the invention]
An object of the present invention is to provide a random sander and an orbital sander dual-purpose machine capable of easily changing the motion of a pad by simple changing means and operation.
[0016]
The invention of claim 1 includes a motor built in a frame, an eccentric shaft having an eccentric mechanism coupled to a rotation shaft of the motor, and a pad attached to the eccentric shaft, and the pad is the motor. in electric sander which performs an oscillating motion to draw a predetermined eccentricity and rotational motion, or a circle by rotation, one connecting shaft of said frame connecting portion that can be connected to each other frame side and pad-side by the connecting shaft pad provided respectively, an electric sander, characterized in that said connecting shaft is detachable so as to connect between the two joining portions.
[0017]
According to the electric sander of the present invention, the eccentricity and rotational motion of the pad of the electric sander can be easily changed to the vibration motion in small increments while the pad is eccentric and drawing a circle. Therefore, the orbital sander based on the random sander A dual-purpose machine can be easily obtained.
[0018]
In the invention of claim 2, the connecting portion provided on the frame side and the pad side, either one is made of an opening through which the connecting shaft can be inserted, and the other is made of a fixing portion for fixing the connecting shaft, 2. The electric sander according to claim 1, wherein the connecting shaft end portion is fixed to the fixing portion by screwing or taper type press fitting.
[0019]
In this electric sander, the movement of the pad can be changed with a simple addition of equipment and an operation method.
[0020]
Of invention of claim 3, wherein the connecting shaft, the electric of claim 1 or 2 wherein at least one of the frame side and the connecting portion in the circumferential portion of the pad side is characterized in that it is formed by an elastic body Sanda.
[0021]
In this electric sander, the contact between the connecting shaft, the frame and the pad is relaxed by the elastic body, the pad movement after the above change becomes a smooth operation, improving the polishability and reducing the transmission of vibration and improving workability. can do.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described based on a structural diagram of a random sander and an orbital sander dual-purpose machine shown in FIG.
[0023]
A random sander / orbital sander 1 shown in FIG. 1 (hereinafter referred to as sander 1) is based on the conventional random sander 100 shown in FIG. The operation is the same as that of the random sander 100.
[0024]
That is, in FIG. 1, a motor 2 is built in a frame 3, and the motor 2 is composed of a commutator 22 having a brush 21 on a rotating shaft 4 and an armature 24 having a stator 23. The rotating shaft 4 is a frame. 3 is rotatably supported by ball bearings 5 and 6 provided at the upper and lower portions of the center portion.
[0025]
A bearing holder 8 is connected to the tip of the rotating shaft 4 with an eccentric amount D from the center O of the rotating shaft 4, and an eccentric shaft 10 is mounted via an internal ball bearing 9. An abrasive 12 such as siding paper is fixed to the eccentric shaft 10 with a screw 13 via a pad 11. A dust fan 14 is provided on the outer periphery of the bearing holder 8.
[0026]
The sander 1 can also be used with a rubber pad and disc paper attached to the eccentric shaft 10.
[0027]
When the motor 2 is driven, the bearing holder 8 which is eccentric with respect to the rotating shaft 4 rotates, and at the same time, the pad 11 connected to the eccentric shaft 10 via the bearing 9 is interlocked with the rotating shaft 4 with an eccentric amount D. A rotating motion is performed while being eccentric, and the material to be polished is polished by the polishing material 12 mounted on the pad 11, and has the function of a conventional random sander.
[0028]
At the same time, air is blown to the motor 2 from the cooling fan 18 fixed to the rotating shaft 4, and the dust fan 14 rotates to suck dust generated by the polishing operation, and the dust bag 16 attached to the frame 3 from the dust collection hole 15. The air collected and filtered is discharged.
[0029]
A brake ring 17 provided on the lower periphery of the frame 3 is an elastic body made of rubber or synthetic resin, and provides rotational resistance by contacting with the pad 11. It suppresses inertial rotation during cutting.
[0030]
Next, a method of connecting the frame 3 and the pad 11 that suppresses the rotational motion of the pad 11 and changes the pad 11 to a vibrating motion that draws a small circle to give an orbital sander function will be described.
[0031]
The connecting portion 30 includes an opening 33 formed in the cover portion 3a of the pad rotating portion on the lower side of the frame 3, a fixing portion 34 protruding from the pad 11, and a connecting shaft 31 that connects the two. ing.
[0032]
FIG. 2 is an enlarged view of the connecting portion 30 (A portion). In the cover portion 3a of the frame 3, an opening 33 through which the connecting shaft 31 is freely inserted is opened through the frame 3. It can move up and down.
[0033]
The connecting shaft 31 is a rod-like body having a head portion 31a. The connecting shaft 31 is provided with connecting means that can be easily attached to and detached from the fixing portion 34 protruding from the upper side of the pad 11 through the opening 33. .
[0034]
The fixing portion 34 is connected to the connecting shaft lower end portion 31b and suppresses the rotational movement of the pad 11. The fixing portion 34 can be easily attached and detached to match the connecting means of the connecting shaft lower end portion 31b, and can be firmly fixed at the time of connection. For example, it is provided with connecting means such as screwing or simply having a taper for press-fitting the connecting shaft.
[0035]
Of course, when the connecting shaft 31 is not connected, the sander 1 performs the eccentric and rotational movement of the random sander. When the pad 11 is connected, the rotational motion of the pad 11 connected to the frame 3 is suppressed, and the pad 11 performs a small vibration motion while drawing a circle with a radius D around the rotational shaft 4, which is an orbital sander function. It can be changed easily.
[0036]
The cooling fan 18 and the dust fan 14 work in the same manner as described above, and the brake ring 17 also works in the same way.
[0037]
Further, at least one of the inner side 35 of the opening 33 or the inner side 36 of the fixing portion 34 is provided with an elastic body such as rubber on the inner periphery thereof, the connection shaft 31 and the frame 3 or the pad 11 are connected. The contact is relaxed and the vibration motion of the pad 11 becomes smooth, so that the polishing property is improved and the polishing machine can be prevented from being damaged. Further, the connecting shaft 31 may be formed of an elastic body.
[0038]
A plurality of the connecting portions 30 may be provided around the cover portion 3a. Thereby, the connection between the cover 3 and the pad 11 is strengthened, and the rotation suppression of the pad 11 is surely and stabilized. In this case, it is preferable that the connecting portions 30 are evenly arranged with respect to the rotating shaft 4 because the operation of the pad 11 is stable on a plane.
[0039]
Therefore, in the sander 1, a random and orbital sander that can easily change the movement of the pad can be obtained by providing a simple connecting means to the conventional random sander without changing the design of the sander or making a major modification. Can do.
[0040]
FIG. 3 is a partially enlarged view showing a modified example of the connecting portion. The connecting portion 40 has a connecting shaft 41 inserted from the lower side of the pad 11. The connecting portion 40 is provided on the frame 3 with an opening 43. It connects to the fixed part 44.
[0041]
The connecting shaft 41 is a rod-shaped body having a head portion 41 a, and is inserted through an opening 43 having a recess in which the head portion 41 a of the connecting shaft provided in the pad 11 is accommodated, and a fixing portion 44 provided in the frame 3. The connecting shaft upper part 41b is provided with a connecting means similar to that described above.
[0042]
By connecting the connecting shaft 41, the rotation of the pad 11 is suppressed by the frame 3 as in the case of FIG. 2, and the motion of the pad 11 can be easily changed.
[0043]
FIG. 4 is a partially enlarged view showing another modified example of the connecting portion. The connecting portion 50 is provided with a protruding portion 52 that protrudes from the lower end of the frame 3 and an opening 53 through which the connecting shaft 51 can be freely inserted is opened. Thus, the connecting shaft 51 can move up and down.
[0044]
The connecting shaft 51 is a rod-like body having a head portion 51a, and the connecting shaft lower portion 51b is simply inserted into the hole-shaped (or groove-shaped) fixing portion 54 provided above the pad 11 through the opening 53. It is provided with a connecting means similar to the above that can be locked. The fixing portion 54 may be provided so as to protrude above the pad 3.
[0045]
Also in this case, similarly to FIGS. 2 and 3, the rotation of the pad 11 is suppressed by the frame 3, and the movement of the pad 11 can be easily changed.
[0046]
3 and 4, the use of elastic bodies (45, 46 and 55, 56) in the opening and the fixing portion and a plurality of connecting portions can of course be arranged.
[0047]
As described above, in the sander 1, the pad can be connected and fixed to the frame by the connecting shaft and its simple connecting means, so that the eccentric and rotational motion of the pad of the random sander can be easily operated in a vibrating motion to draw a circle. Can be changed.
[0048]
Therefore, the random and orbital sander machine can be easily connected to the random sander with a single sander that can handle all polishing operations from roughing to finishing and polishing according to the material and surface condition of the material to be polished. Can be obtained at low cost.
[0049]
【The invention's effect】
As described above, with the electric sander of the present invention, it is possible to obtain a random sander and an orbital sander dual-purpose machine that can change the motion of the pad of the random sander by a simple operation using the connecting shaft. .
[0050]
Therefore, the polishing work that has conventionally used two types of sanders can be handled by one sander, the work efficiency is improved, the attached parts and management are reduced, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a structural diagram of a random sander and an orbital sander dual-purpose machine according to an embodiment.
FIG. 2 is an enlarged view of a connecting portion of the embodiment.
FIG. 3 is an enlarged view of a connecting portion of a modified example.
FIG. 4 is an enlarged view of a connecting portion according to another modified example.
FIG. 5 is a structural diagram of a conventional random sander.
FIG. 6 is a partial structural diagram of a conventional orbital sander.
[Explanation of symbols]
1 ... Random sander and orbital sander 2 ... Motor 3 ... Frame 4 ... Rotating shaft 8 ... Bearing holder 9 ... Ball bearing 10 ... Eccentric shaft 11 ... Pad 30 ... Connecting portion 31 ... ... Connecting shaft 33 ... Opening 34 ... Fixing part

Claims (3)

A motor built in the frame; an eccentric shaft provided with an eccentric mechanism coupled to the rotation shaft of the motor; and a pad attached to the eccentric shaft. In the electric sander that performs a rotational motion or a circular vibration motion, the frame and the pad each include a connection shaft and a connection portion that can connect the frame side and the pad side with the connection shaft. There electric sander, characterized in that it is detachable so as to connect between the two joining portions.  One of the connecting portions provided on the frame side and the pad side is an opening through which the connecting shaft can be inserted, the other is a fixing portion for fixing the connecting shaft, and the connecting shaft end is the The electric sander according to claim 1, wherein the electric sander is fixed to the fixing portion by screwing or taper type press fitting.  3. The electric sander according to claim 1, wherein at least one of the connection shaft, the frame side, and the pad side inner peripheral portion of the connection side is formed of an elastic body.

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