JPH0740242A - Dust collecting device for sanding machine - Google Patents

Abstract

PURPOSE:To prevent chips produced inside a sanding area from flowing outside the sanding area. CONSTITUTION:A frame shaped dust sucking duct 51 for surrounding a sanding area S is mounted in an upper frame 31 and a frame shaped vent hole 55 facing to the dust sucking duct 51 is mounted in a lower frame 12 and an air curtain C for surrounding the sanding area S is formed by air current flowing from the vent hole 55 to the dust sucking duct 51. Chips produced inside the sanding area S in accordance with the sanding applied to a work are prevented from leaking to the outside of the sanding area S by the air curtain C and attracted inside the dust sucking duct 51 following the air flow of the air curtain C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sanding machine which grinds the surface of wood or resin and which has an improved dust collecting structure for cutting chips generated in the sanding area.

[0002]

2. Description of the Related Art For example, a wide belt sander is used as a sanding machine used for polishing and grinding woodworking materials and resin materials. As a general structure, a work transfer mechanism is constructed by hanging an endless material feeding belt between a plurality of rolls at the bottom of the main frame, and an endless sanding belt is placed between the rolls at an upper part thereof. It is known that a sanding mechanism that forms a sanding region is provided on the work transfer surface. In such a sanding machine, when a work enters the sanding area, the upper surface of the work is polished and ground by a sanding belt that runs while being pressed by a tread pad.

In this type of belt sander, a dust collecting mechanism is provided in order to prevent a large amount of chips generated during the sanding process from scattering around. The following is an example of the dust collecting mechanism. This is because, for example, when the sanding belt travels in the work approaching direction opposite to the work conveying direction, a dust suction duct is provided on the work approaching side of the sanding area, and the air shavings scraped off by the sanding belt flows into the dust suction duct. It sucks with the flow.

[0004]

However, it is impossible for the dust suction duct to suck all of the chips generated in the sanding area, and a part of the chips is not sucked in the dust suction duct and remains in the sanding area. There was a problem that it was unavoidable to escape to the side or work discharge side and float around the sanding machine.

The present invention was devised in view of the above circumstances, and reliably sucks the cutting chips generated in the sanding area, and the cutting chips leak to the outside of the sanding machine to deteriorate the working environment. The purpose is to prevent

[0006]

As means for solving the above-mentioned problems, the invention according to claim 1 is a sanding mechanism for polishing and grinding a work, and the sanding by mounting the work on a conveying surface. A work transfer mechanism that sends the work into the sanding area, and a dust suction duct that opens in a frame shape so as to surround the sanding area is provided above the transfer surface, and the sanding is performed in the frame-shaped area of the transfer surface that corresponds to the dust suction duct. It is characterized in that a vent hole surrounding the area is provided.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, pressurized air is supplied to the vent hole.

According to a third aspect of the present invention, in the invention according to the first aspect or the second aspect, the area of the conveying surface surrounded by the ventilation hole is constituted by a belt conveyor in which a material feeding belt is stretched between rolls. The tension roll for tensioning the material feeding belt is provided so as to be movable in a direction intersecting the stretching direction of the material feeding belt.

[0009]

According to the first aspect of the present invention, the air curtain that surrounds the sanding region is generated by the air flow that flows into the dust suction duct from the ventilation hole. The chips generated in the sanding region are prevented from flowing out of the sanding region by the air curtain, and the chips are carried by the air flow of the air curtain and sucked into the dust suction duct.

In the invention according to claim 2, since the compressed air is discharged from the vent, the flow of the air flow of the air curtain is strong, so that the outflow of the cutting chips to the outside of the sanding region can be surely prevented and the cutting flow can be prevented. The dust is efficiently absorbed by the powder.

According to the third aspect of the present invention, the tension of the material feeding belt for preventing the slack of the conveying surface in the sanding area is not adjusted by the movement of the positions of the rolls spaced apart on the conveying surface. This is performed by moving the tension roll in a direction intersecting the stretching direction of the material feeding belt.

[0012]

As described above, according to the present invention, the air curtain prevents the chips generated in the sanding area from flowing out of the sanding area. This has an excellent effect that it is possible to prevent the work environment from being deteriorated by flowing out of the sanding area.

Particularly, according to the second aspect of the invention, the momentum of the air flow forming the air curtain becomes strong,
Even if the scattering of chips generated in the sanding region is strong, it is possible to reliably prevent the chips from flowing out of the sanding region.

Further, according to the third aspect of the invention, the tension of the material feeding belt is not adjusted by moving the positions of the rolls spaced apart on the conveying surface, but the tension roll is stretched over the material feeding belt. Since it is performed by moving in a direction intersecting with the direction, even if the belt conveyor is provided within the limited range of the sanding area,
The excellent effect that the conveying surface of the belt conveyor in the sanding area can be maintained in a tension state is obtained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

Overall, it comprises a work transfer mechanism 10, a sanding mechanism 30 and a dust collecting mechanism 50.

<Work Transfer Mechanism 10> First, the work transfer mechanism 10 will be described. The lower frame 12 installed on the floor and having a partially opened upper surface has a work entrance end (right side position in FIG. 1) and a work discharge end (FIG. 1) on the upper surface.
A plurality of material feeding rolls 13 that are rotationally driven by a driving mechanism (not shown) in parallel at the left side position).

A belt is provided between the left and right rows of the material-sending rolls 13 (center position in FIG. 1) to form a conveying surface together with the material-sending rollers 13 and conveys a work (not shown) in the direction of arrow X in FIG. A conveyor 15 is provided. The belt conveyor 15 is rotatably supported by a supporting body 20 projecting from the inner periphery of the opening of the lower frame 12 in a cantilever state, and is similarly supported by a work discharge side driving roll 16 driven by a driving mechanism (not shown). An endless material feeding belt 18 is stretched between the driven roll 17 on the work entry side which is rotatably supported by the body 20. In addition, at the lower position between the drive roll 16 and the driven roll 17, the support 2
A tension roll 19 rotatably supported at 0 is provided to be vertically movable by an adjusting mechanism (not shown), and the tension force of the material feeding belt 18 can be adjusted by displacing the position of the tension roll 19. You can do it.

<Sanding Mechanism 30> Next, the sanding mechanism 30 will be described.

Above the work transfer mechanism 10, an upper frame 31 whose lower surface is partially opened is operated by turning on an operation switch or rotating an operation handle 31 to guide a rod by an elevator device (not shown). 32
It is provided so that it can be moved up and down along. The sanding mechanism 30 moves up and down by the operation of the elevating device, and the distance between the sanding belt 38, which will be described later, and the material feeding belt 18 of the work transfer mechanism 10 can be set to a desired dimension.

In the upper frame 31, the drive roll 3 is rotated in its upper position by a motor (not shown).
4 is provided, and the guide roll 35 located on the work discharge side and the sanding roll 36 located on the work entrance side along the lower surface of the upper frame 31 are cantilevered from the inner periphery of the opening of the upper frame 31. It is rotatably supported by a projecting support body 37, and an endless sanding belt 38 is stretched between them. An air cushion type tread pad 39 is provided between the guide roll 35 and the sanding roll 36.
8 is provided on the back surface side of 8, and the sanding belt 38 is urged downward (workpiece side) by this pedal pressure pad 39.

Guide roll 35 and sanding roll 36
A sanding area S corresponding to the conveying surface of the belt conveyor 15 of the work conveying mechanism 10 is formed between and, and the sanding belt 38 has an arrow in the sanding area S that is opposite to the conveying direction of the material feeding belt 18. It travels in the Y direction, whereby the work is ground or polished while being sandwiched between the sanding belt 38 and the material feeding belt 18. <Dust Collection Mechanism 50> Next, the dust collection mechanism 50 will be described.

Inside the upper frame 31, a rectangular shape enclosing the sanding area S from the work discharge side of the guide roll 35 of the sanding mechanism 30, the work entrance side of the sanding roll 36, and the four sides on the outside of both edges of the sanding belt 38 in the sanding area S. A frame-shaped dust suction duct 51 is provided. The upper portion of the dust suction duct 51 is led out upward from the upper frame 31 and connected to the suction side of a dust collecting fan (not shown). Further, the suction port 52 at the lower end of the dust suction duct 51 has a tapered cross-section that widens toward the inside and outside of the sanding region S and opens greatly downward.

Inside the suction port 52 of the dust suction duct 51, the work discharge side of the guide roll 35 and the sanding roll 36.
The pressing rolls 53 are provided on the workpiece entry side of the pressing rolls 53. The pressing rolls 53 are supported so as to be vertically movable and urged downward by a compression coil spring (not shown).

It should be noted that two thin arms 37a, 37a for cantilever fixing the support 37 for supporting the sanding mechanism 30 to the upper frame 31 are passed through a portion along the outer side of one edge of the sanding belt 38. Therefore, the dust suction duct 51 is divided at that portion with a slight gap, and the portion between both arms 37a, 37a is a separate thin dust suction duct 51a.

On the other hand, in the lower frame 12, the gap between the belt conveyor 15 of the work transfer mechanism 10 and the material feeding roll row 13 on the work entry side, the belt conveyor 15 and the material feeding roll row 13 on the work discharge side. The ventilation holes 55 in the shape of a square frame surrounding the sanding area S from the four sides on the outer sides of both edges of the belt conveyor 15 are formed by the dust suction duct 51.
Is provided so as to open upward toward the suction port 52. A discharge side of an air compressor (not shown) is connected to the ventilation port 55 via a ventilation pipe 56, and pressurized air is blown upward from the ventilation port 55 toward the dust suction duct 51 side.

In a portion along the outer side of one edge of the belt conveyor 15, two thin arms 20a, 20a for cantilever fixing the support 20 supporting the belt conveyor 15 to the lower frame 12 are inserted. At that portion, the ventilation hole 55 is divided at a slight interval, and the portion between both arms 20a, 20a is a separate ventilation hole 55a.

Further, a dust collecting fan whose upper part is not shown is provided on the work entry side of the sanding region S, that is, on the discharge side of chips generated by polishing and grinding of the work (the right side of the sanding roll 38 in FIG. 1). An auxiliary dust suction duct 56 connected to the is disposed. The suction port 57 at the lower end of the auxiliary dust suction duct 56 is opened in a region surrounded by the dust suction duct 51 at a position close to the chip discharging portion of the sanding roll 38.

Next, the operation of this embodiment will be described.

First, the upper frame 31 is moved up and down to adjust the distance between the sanding belt 38 and the material feeding belt 18 in the sanding area S. This interval is determined in consideration of the thickness of the work and the necessary "cutting margin", and can be set while looking at a known gauge (not shown). After that, the work transfer mechanism 10 and related devices such as a dust collecting fan and an air compressor are activated.

Then, between the upper frame 31 and the lower frame 12, an airflow that is blown upward from the ventilation port 55 and flows into the suction port 52 of the dust suction duct 51 makes the sanding region S all around the sanding region S. A surrounding air curtain C is created. Further, in the generation region of the air curtain C, an air flow that flows into the auxiliary dust suction duct 56 is generated.

From this state, when a work (not shown) is fed into the sanding area S by the work transfer mechanism 10, the upper surface of the work is polished and ground by the sanding belt 38. A large amount of swarf is generated along with the sanding on the work, and the swarf soars to the periphery of the sanding area S and is blown to the work approaching side of the sanding belt 38. However, these chips are prevented from leaking to the outside of the sanding region S by the air curtain C that is formed so as to surround the sanding region S, and the chips are multiplied by the air flow of the air curtain C and inside the dust suction duct 51. Is sucked into the auxiliary dust suction duct 56 by being carried by the air flow flowing into the auxiliary dust suction duct 56.

Here, while the work is passing through the sanding region S, a part of the vent hole 55 is blocked by the work. However, the suction port 52 of the dust suction duct 51
The air is always kept open throughout the whole, and the air blown into the dust suction duct 51 from the unoccluded portion of the ventilation port 55 and the air from the outside of the sanding area S. Is coming in.
Therefore, the air curtain C is generated so as to surround the sanding area S over the entire circumference.

Further, because of the arm 37a of the support body 37 supporting the sanding mechanism 30 and the arm 20a of the support body 20 supporting the belt conveyor 15, the dust suction duct 51 and the vent hole 55 are arranged in the circumferential direction. Although a part is divided, since the interval between the divided parts corresponding to the arms 37a and 20a is short, there is no large gap in the generated air curtain C so that chips can easily pass therethrough. .

As described above, according to the present embodiment, the air curtain C prevents the chips generated in the sanding area S from flowing out of the sanding area S. There is no danger of the material leaking out and deteriorating the work environment.

Further, since the air curtain C is generated by the pressure air blown out from the ventilation port 55, the force of the air flow is strong, and even if the scattering of chips is strong, it goes out of the chip sanding area S. Leakage is reliably prevented.

Further, since the belt conveyor 15 of the work transfer mechanism 10 is surrounded by the frame-shaped ventilation holes 55, the drive roll 16 and the driven roll 17 located at both ends on the transfer surface extend in a direction in which they spread. Although there is almost no room to move, the tension force of the material feeding belt 18 can be adjusted because the tension roller 19 is provided on the belt conveyor 15.

The present invention is not limited to the above embodiment, but can be modified and implemented as follows, for example. (1) In the above-described embodiment, the air curtain C is generated by blowing the pressure air from the ventilation port 55 toward the dust suction duct 51. However, even if the pressure air is not blown from the ventilation port 55, the dust suction duct. It is also possible to generate the air curtain C only by the suction force of 51. (2) In the above-described embodiment, the auxiliary dust suction duct 56 is provided on the chip discharge side of the sanding region S in the generation region of the air curtain C. However, the auxiliary dust suction duct 56 is not provided, and the air flow of the air curtain C is used. Dust collecting duct 5
You may make it suck only to one. (3) In the above embodiment, the sanding belt 38
The upper frame 31 provided with the sanding mechanism 30 is moved up and down as a means for adjusting the distance between the paper feeding belt 18 and the material feeding belt 18. Conversely, the lower frame 12 provided with the work transfer mechanism 10 is moved up and down. You may do it. (4) In the above embodiment, the running direction of the sanding belt 38 in the sanding area S is set to be the opposite direction to the work transfer direction, but the sanding belt travels in the direction orthogonal to the work transfer direction. You may allow it. (5) In the above embodiment, the portion of the transport surface corresponding to the sanding area S is constituted by the belt conveyor 15, but the portion corresponding to the sanding area S is formed by arranging a plurality of material feeding rolls in parallel. You may comprise. (6) In the above-described embodiment, the portion of the transport surface other than the sanding area S is configured by the plurality of material feeding rolls 13, but the portion outside the sanding area S may be configured by the belt conveyor.

Besides, the present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be carried out without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is an overall front view of an embodiment of the present invention.

[Figure 2] Overall right side view

3 is a sectional view taken along the line AA of FIG.

4 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 10 ... Work transfer mechanism 15 ... Belt conveyor 16 ... Driving roll 17 ... Following roll 18 ... Material feeding belt 19 ... Tension roll 30 ... Sanding mechanism 51 ... Dust suction duct 55 ... Venting hole S ... Sanding area

Claims (3)

[Claims] 1. A sanding machine comprising: a sanding mechanism for polishing and grinding a work; and a work transfer mechanism for placing the work on a transfer surface and sending the work to a sanding area by the sanding mechanism. In the sanding machine, a dust suction duct that opens in a frame shape so as to surround the sanding region is provided, and a vent hole that surrounds the sanding region is provided in a frame-shaped region corresponding to the dust suction duct on the transport surface. Dust collector. 2. The dust collecting apparatus for a sanding machine according to claim 1, wherein pressurized air is supplied to the ventilation port. 3. A range of the conveying surface surrounded by the ventilation port is constituted by a belt conveyor in which a material feeding belt is stretched between rolls, and a tension roll for tensioning the material feeding belt is used for the feeding. The dust collecting device for a sanding machine according to claim 1 or 2, wherein the dust collecting device is provided so as to be movable in a direction intersecting a stretch direction of the material belt.