JP2660152B2 - Belt sander - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt sander for polishing a work using a brush roll.

[0002]

2. Description of the Related Art As a belt sander for polishing a work using a brush roll, an endless belt is provided between a drive roll provided to be rotated by a drive motor and a brush roll freely provided in a passage area of the work. The structure is such that the sanding belt is stretched over, the sanding belt runs in one direction by the rotation of the drive roll, and the sanding belt is pressed against the work in the brush roll part to grind the work. Have been.

[0003]

In the above-described conventional belt sander, the brush roll is supported rotatably, and the running of the sanding belt is performed only by the rotational force of the drive roll.

[0004] For this reason, in the portion of the sanding belt that is wrapped around the brush roll, the bristle of the brush roll is pulled and bent by the sanding belt, and the bent bristle is applied to the work sent to the polishing area. There is a danger that it will face in the direction to hit. In this case, the bristle of the brush roll acts as a resistance in the direction that hinders the work feed, which causes a problem that the work feed is hindered.

[0005] Further, since the traveling of the sanding belt is performed only by the rotational force of the driving roll, a portion of the traveling path of the sanding belt from the brush roll toward the driving roll is kept in tension by being pulled by the driving roll. On the other hand, the portion from the drive roll toward the brush roll is in a state of being easily loosened because the pull by the brush roll does not work, so that the running of the sanding belt is unstable. Therefore, when the sanding belt receives resistance due to friction between the sanding belt and the workpiece during polishing, there is a possibility that a portion of the sanding belt from the driving roll toward the brush roll may be loosened. When such slack occurs, the driving roll slips with respect to the sanding belt due to the loosening of the sanding belt, and the running speed of the sanding belt becomes unstable or in the worst case, the running of the sanding belt stops. As a result, good polishing cannot be performed.

A method of increasing the tension in order to prevent the tension of the sanding belt from being loosened is also conceivable. However, in this case, the outer periphery of the brush roll may be deformed so as to be crushed. When such deformation occurs, the sanding belt is offset in the roll axis direction, so that good polishing cannot be performed.

The present invention has been made in view of the above circumstances, and is a belt sander that does not hinder work feeding and that can stably run the sanding belt and perform good polishing. The purpose is to provide.

[0008]

According to the present invention, an endless sanding is provided between a driving roll rotated by a driving motor and a brush roll as a means for solving the above-mentioned problems. A belt that hangs over the belt and polishes the work by pressing the sanding belt against the work at the brush roll portion, characterized in that a brush roll drive mechanism that applies a driving force to the brush roll is provided. It is.

According to a second aspect of the present invention, in the first aspect of the present invention, the brush roll driving mechanism includes an auxiliary driving motor that drives the brush roll independently of the driving roll. It has.

A third aspect of the present invention is characterized in that, in the second aspect of the present invention, the auxiliary drive motor has a configuration in which the rotation speed is adjustable.

[0011]

[Function] Since the brush roll is given a driving force by the brush roll driving mechanism and rotates by itself,
The sanding belt is maintained in a tensioned state by receiving a pulling force not only in a portion of the traveling path from the brush roll to the drive roll but also in a portion from the drive roll to the brush roll, so that it is less likely to be loosened. And perform stable running. Therefore, even when the sanding belt receives resistance due to friction between the sanding belt and the workpiece during polishing, there is no possibility that the sanding belt will loosen from the drive roll toward the brush roll.

[0012] In the invention according to claim 2,
Since the brush roll is driven independently of the drive roll, the brush roll can be driven at a desired rotation speed without being restricted by the running speed of the sanding belt.

[0013] Also. In the invention according to claim 3,
The rotation speed of the brush roll can be appropriately adjusted according to the feed speed of the work, the material of the work, the polishing state of the work, the presence or absence of loosening of the sanding belt, and the like.

[0014]

As described above, according to the present invention, the driving force is applied to the brush roll and the brush roll is rotated by itself, so that the work is smoothly fed and the sanding belt is always stably maintained. This has the effect that the workpiece can be run and the workpiece can be polished well.

In particular, the invention according to claim 2 enables the brush roll to be driven at a desired rotation speed without being restricted by the running speed of the sanding belt. When adjusting the state, there is an effect that the degree of freedom of the adjustment is high.

According to a third aspect of the present invention, the rotation speed of the brush roll is controlled by changing the feed speed of the work, the material of the work,
Since the grinding state of the work, the presence or absence of loosening of the sanding belt, and the like can be appropriately adjusted, the running state and grinding state of the sanding belt can be more finely adjusted, and extremely good polishing is realized. There is an effect that can be.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a belt sander for polishing a curved surface will be described below with reference to FIGS. As shown in FIG. 1, the belt sander of this embodiment is provided with a transport mechanism 10 for supporting a curved work (not shown) at a lower portion of the main frame 1 and sending the work in a substantially horizontal direction. The polishing mechanism 20 is provided.

First, the transport mechanism 10 will be described. The transport mechanism 10 wraps an endless transport belt 13 around two upper transport rolls 11 arranged side by side and a lower transport roll 12 disposed below the upper transport rolls 11, 11, and is not shown. The transport belt 13 is circulated in one direction by a driving means, and the workpiece is placed on both upper transport rolls 11, 11 so as to follow an arcuate path by the transport belt 13 in a substantially horizontal direction. To be transported.

The polishing mechanism 20 has a plurality of bristles radially implanted on the outer periphery thereof, and a brush roll 21 disposed right above the intermediate position between the upper transport rollers 11, 11 of the transport mechanism 10. And an endless sanding belt 2 between the brush roll 21 and a drive roll 22 disposed directly above the brush roll 21.
3 is multiplied. The support structure of the brush roll 21 is as follows. On a bracket 24 fixed to the uppermost surface of the main frame 1, a male screw rod 25 having a handle 26 at an upper end is freely supported only for rotation with its axis in the vertical direction. An elevating support plate 30, which is guided only vertically by guide bars 31, 31 with the plate surface oriented vertically, is mounted on the male screw rod 25 by screwing the female screw 32. An auxiliary drive motor 35 driven by a variable frequency output inverter device is fixed on the back surface of the lifting support plate 30 in a state housed in a housing 36, and a brush roll drive mechanism 34 is configured. The rotation speed of the auxiliary drive motor 35 of the brush roll drive mechanism 34 can be controlled by operating a switch on the control panel 2 provided on the front of the main frame 1. An auxiliary drive shaft 37 that is rotated by an auxiliary drive motor 35 is supported on the lifting support plate 30 in a state where the auxiliary drive shaft 37 projects in the front direction with the axial direction being horizontal.
The brush roll 21 described above is attached so as to rotate integrally. The auxiliary drive motor 35 and the brush roll 21 attached to the lifting support plate 30 in this manner
By moving the male screw bar 25 by operating the handle 26, the handle can be moved integrally in the vertical direction.

An air cylinder 40 is fixed to an upper surface of a housing 36 accommodating the auxiliary drive motor 35 with its piston rod 41 protruding vertically upward. At the upper end of the piston rod 41, a turning shaft 43 fitted in a bearing hole 42 provided in the lifting support plate 30 so as to rotate and ascend and descend freely is connected concentrically with the piston rod 41. Swivel axis 43
A movable plate 45 is fixed to the upper end of the drive motor. A drive motor 50 that operates independently of the auxiliary drive motor 35 is fixed to the movable plate 45. A drive shaft 51 rotated by a drive motor 50 is supported by the bracket 46 of the movable plate 45 so that the drive shaft 51 is parallel to the auxiliary drive shaft 37. The drive roller 22 rotates integrally with the drive shaft 51. So that it is attached. The drive motor 50 and the drive roll 22 can be moved up and down relative to the auxiliary drive motor 35 and the brush roll 21 by the operation of the air cylinder 40.

The movable plate 45 is provided with an adjusting arm 47 projecting horizontally on the front side, and an adjusting plate 48 which is long in the vertical direction is fixed to a tip of the adjusting arm 47. On the other hand, the lifting support plate 30 is provided with a pair of support arms 60, 60 which also project horizontally to the front side, and the adjustment plates 48 are sandwiched from both sides at the tips of the adjustment arms 60, 60. Adjustment bolts 61 and 62 are screwed. The position of the adjustment plate 48 can be moved laterally by screwing the two adjustment bolts 61 and 62. Thereby, the drive motor 50 and the drive roll 22 are horizontally turned around the rotation shaft 43 together with the movable plate 45, and the direction of the axis of the drive roll 22 is adjusted so as to be parallel to the axis of the brush roll 21. Sanding belt 2
3 can be prevented from shifting in the axial direction.

The two work guide rolls 7 are supported on both sides of the brush roll 21 so as to be freely movable in a substantially vertical direction about a swing shaft 70 fixed to the elevating support plate 30.
1, 71 are provided, and each work guide roll 71
Is adjusted to a predetermined height by a plurality of adjustment bolts 72. A belt pressing roll 75 that sandwiches the sanding belt 23 between the driving roll 22 and the driving roll 22 is provided on a side of the driving roll 22, and a pressing force against the driving roll 22 can be adjusted by an adjustment bolt 76. I have. Reference numeral 77 denotes a handle for releasing the pressing of the belt pressing roll 75.

Next, the operation of this embodiment will be described.
Prior to grinding the work, air cylinder 4
0, the drive roll 22 is raised with respect to the brush roll 21, whereby the sanding belt 23 is adjusted to be stretched between the drive roll 22 and the brush roll 21 with an appropriate tension. I do. At the same time, the brush roll 21, the drive roll 22, and the sanding belt 2 are operated by operating the handle 26.
3 is moved up and down integrally, and adjusted so that there is an appropriate interval according to the thickness dimension of the work, the cutting allowance, and the like between the upper transport rollers 11, 11 of the transport mechanism 10 and the brush roll 21. .

In this state, the drive roller 22 and the brush roller 21 are rotated at a predetermined speed by independently operating the drive motor 50 and the auxiliary drive motor 35 at a predetermined speed. Thus, the sanding belt 23 runs at a predetermined speed with a predetermined tension. In the running direction of the sanding belt 23, the portion wound around the brush roll 21 and the work feeding direction are opposite to each other.

In this state, the work is moved to the brush roll 21.
The upper surface of the work is polished by the portion of the sanding belt 23 wrapped around the brush roll 21 when the workpiece is fed into the polishing area between the upper transport rolls 11 and 11. The work is suppressed by the work guide rolls 71 on both sides of the brush roll 21 to prevent the work from floating upward.

At this time, the rotation of the brush roll 21 by itself causes the sanding belt 23 not only to move from the drive roll 22 to the drive roll 22 but also to the portion of the traveling path from the brush roll 21 to the drive roll 22.
Also in the part heading for 1, the tension state is maintained by receiving the pulling force, so that slack is unlikely to occur and stable running is performed. Therefore, while the work is being polished, the sanding belt 23 receives resistance in a direction in which traveling is hindered by friction between the work and the sanding belt 23. There is no risk of occurrence. For this reason, the driving roll 22
Does not slip with respect to the sanding belt 23, the sanding belt 23 maintains a stable running speed, and the workpiece is polished satisfactorily. In addition, since it is not necessary to apply a high tension to the sanding belt 2 to prevent the sanding belt 23 from becoming loose, the outer periphery of the brush roll 21 is crushed and deformed due to the high tension, so that the sanding belt 2 is deformed.
There is no fear that 3 will be offset in the axial direction. Therefore, the sanding belt 23 is always kept at an appropriate position, and good polishing can be expected from this point as well.

It is desirable that the rotation speed of the brush roll 21 is appropriately adjusted according to the feed speed of the work, the material of the work, the polishing state of the work, the presence or absence of looseness of the sanding belt 23, and the like. The rotation speed can be adjusted arbitrarily by an operator operating a switch on the control panel 2 of the main frame 1. Thereby, the running state of the sanding belt 23 is always kept good, and extremely good polishing is realized.

The present invention is not limited to the embodiment described above and shown in the drawings, but can be implemented with various modifications without departing from the scope of the invention.

[Brief description of the drawings]

FIG. 1 is an overall front view.

FIG. 2 is an enlarged front view of a polishing mechanism.

FIG. 3 is an enlarged side view of a polishing mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 ... Brush roll 22 ... Drive roll 23 ... Sanding belt 34 ... Brush roll drive mechanism 35 ... Auxiliary drive motor 50 ... Drive motor

Claims (3)

(57) [Claims] An endless sanding belt is wound between a drive roll rotated by a drive motor and a brush roll, and the sanding belt is pressed against the work at the brush roll portion to polish the work. And a brush roll driving mechanism for applying a driving force to the brush roll. 2. The brush roll drive mechanism according to claim 1, further comprising an auxiliary drive motor for driving said brush roll independently of said drive roll.
The described belt sander. 3. The belt sander according to claim 2, wherein the rotation speed of the auxiliary drive motor is adjustable.