JP2501468Y2 - Wide belt sander - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wide belt sander having an improved chip collecting structure on the front side of a sanding area.

[0002]

2. Description of the Related Art The general construction of a wide belt sander used for polishing and grinding woodworking materials and resin materials is as follows.

A processing table is provided at the bottom of the main frame, and an endless material feeding belt is stretched between the rolls so as to move on the processing table. The material feeding belt is driven at a low speed in one direction by a motor, and the work is conveyed thereby. On the other hand, an endless sanding belt is hung above the material feeding belt in the upper part of the main frame in a direction along the same, and a treading member such as a pad is provided above the sanding belt above the work passage area. . The sanding belt is run by the motor in the direction opposite to the direction in which the work is conveyed, and at that time, the sanding belt is pressed against the work by the pad to polish and grind the surface of the work.

In this type of belt sander, as a dust collecting device for removing chips generated by sanding, for example, those shown in Japanese Utility Model Publication No. 47-32713 and Japanese Utility Model Publication No. 63-27969 are disclosed. Is known. As shown schematically in FIG. 6A, a dust suction duct 2 is provided on the front side of the sanding area by the sanding belt 1 (the entry side of the work W) and connected to the suction side of a dust collecting fan device (not shown). The cutting dust is sucked into the dust suction duct 2 together with the surrounding air.

With this structure, the work W is placed on the material feeding belt 4 on the processing table 3 and conveyed in the direction of arrow A, and the sanding belt 1 travels in the direction of arrow B. Therefore, during grinding / polishing of the work W, chips are discharged toward the front of the sanding roll 5 in the same direction as the running direction of the sanding belt 1. Further, with the folding and winding of the sanding belt 1 which winds around the sanding roll 5 and changes its direction upward, it scatters slightly upward as indicated by an arrow C group in FIG. Therefore, a large amount of chips generated during the sanding process of the work W is efficiently sucked into the dust suction duct 2 which is open in the front upper part of the sanding roll 5 as shown in the figure.

[0006]

By the way, in recent years, there has been a particularly strong demand for improvement in the working environment, and extremely high dust collecting performance is also required for this type of sanding machine. When the conventional wide belt sander is evaluated from such a viewpoint, the fact is that it is still insufficient.

For example, in this type of belt sander, when a work is placed on a material feeding belt and sent into the sanding area from the work insertion port, the cutting dust is sufficiently collected while the work is being ground (polished). Although it does not leak from the inside of the housing of the sanding mechanism, there is a phenomenon that the chips are like mist from the insertion port of the work at the end of grinding and are temporarily and vigorously discharged to the outside of the machine. Since such a phenomenon is a problem that must be firstly prevented in order to suppress the leakage of cutting chips from the belt sander, the inventors of the present invention repeated many experiments and observations to explore the cause.

According to the investigation by the present inventors, the cause of the above-mentioned phenomenon of abnormal leakage of cutting chips was as follows.
That is, as shown in FIG. 6 (A), since the sanding belt 1 is pressed against the work W by the treading pad 6, the largest amount of chips is generated at that portion. However, since the sanding belt 1 is in close contact with the work W between the treading pad 6 corresponding to the downstream side in the running direction of the sanding belt 1 and the sanding roll 5, the generated chips are not attached to the sanding belt 1. Hold down. The large amount of chips is released from the state where the sanding belt 1 is pressed down on the right side portion of the sanding roll 5 in the figure where the sanding belt 1 is separated from the work W. However, since the sanding belt 1 changes its direction upwards in this portion, the cutting chips are also emitted upwards along the traveling direction of the sanding belt 1, and as shown in FIG. It flows toward the opening of the duct 2.
Therefore, during the grinding of the work W, the abnormal leakage phenomenon of chips does not occur.

However, at the final stage of the grinding of the work W, the positional relationship between the work W and the tread pad 6 is as shown in FIG. That is, the chips generated at the portion of the tread pad 6 are immediately released into the air without being pressed between the sanding belt 1 and the work W and can fly freely. Moreover, the sanding belt 1 running at high speed causes strong wind in the direction of pushing the chips. Therefore, the chips generated at the end of the grinding of the work W proceed straight forward with a strong force from the rear end of the work W toward the work insertion port side as shown by an arrow D group in FIG. The part leaks out of the housing.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a wide belt sander capable of preventing leakage of cutting chips from a housing as much as possible.

[0011]

A wide belt sander according to the present invention is provided between a plurality of rollers and a work conveying mechanism for providing a traveling material feeding belt in contact with a processing table so as to convey a work by the material feeding belt. A sanding mechanism that grinds and grinds the work by pressing the sanding belt against the work by a treading member while running the endless sanding belt running in the opposite direction to the work conveying direction on the work sanding surface. It is equipped with a dust suction duct that is provided on the work entry side of the sanding mechanism and that suctions the chips generated along with the grinding and polishing of the work together with the surrounding air.
A feature is that the processing table is formed with a discharge port for discharging compressed air at a position closer to the dust suction duct than a position facing the pedaling member, and a large number of vent holes are formed in the material feeding belt (claim) Invention of paragraph 1).

Further, the processing table is provided with a main air outlet for discharging the pressure air at a position closer to the dust suction duct than the position facing the pedaling member, and further the pressure air is discharged at a position corresponding to the intake portion of the dust suction duct. An auxiliary air outlet for discharging may be provided (invention of claim 2).

[0013]

According to the wide belt sander according to the first aspect of the present invention, the work is conveyed on the working table so as to pass through the sanding area of the sanding mechanism as the material feeding belt travels. Here, the processing table is formed with an air outlet for discharging pressurized air, and the material feeding belt is formed with a large number of air holes, so that the rear end of the work is positioned ahead of the air outlet. At the time of being conveyed to, the air outlet is opened, and the pressure air from the air outlet is discharged to the sanding belt side through the ventilation hole of the material feeding belt. Further, since the discharge port is formed at a position closer to the dust suction duct than the position facing the treading member, the work piece has to be cut through the sanding area after the rear end portion is sent ahead of the discharge port. Become. Therefore, when the grinding (polishing) of the work is completed, a strong air flow penetrating the material feeding belt is generated near the rear end of the work, and at the end of the grinding of the work, the air flows backward from the rear end. The strong discharge flow of the discharged chips is bent in the flow direction by the above-mentioned air flow, comes out of the work insertion port and goes toward the dust suction duct side to prevent the leakage thereof.

According to the wide belt sander having the sub-exhaust port in addition to the main exhaust port as in the second aspect of the present invention, the sub-exhaust port penetrates the ventilation hole of the material feeding belt to inhale the dust suction duct. An air flow towards the section will also be generated.
Therefore, the discharge flow of chips discharged backward from the rear end of the work is bent in the direction by the air flow from the main air outlet, and further becomes the air flow from the auxiliary air outlet into the dust suction duct. The dust is sucked into the dust suction duct more reliably.

[0015]

As described above, according to the wide belt sander of the first aspect, the air flowing through the ventilation holes of the material feeding belt in the direction of the discharge flow of the chips generated at the final stage of grinding (polishing) of the workpiece. Since it can be changed to the dust suction duct side by the flow, it has an excellent effect that it is possible to reliably prevent the chips from leaking out of the machine.

Further, according to the wide belt sander of the second aspect, since the discharge flow of the cutting chips is multiplied by the air flow from the sub-exhaust port to be surely sucked in the dust suction duct, the cutting chips are cut off. This has the effect of making it even more reliable to prevent leakage to the outside of the aircraft.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment embodying the present invention will be described below with reference to FIGS.

As shown in FIG. 2, the overall structure is such that a sanding mechanism 50 is provided above the work transfer mechanism 10 and these are connected and integrated by a housing 100.
The work transfer mechanism 10 is provided with a material feeding belt 11 extending in the left-right direction in FIG.

<Sanding Mechanism> First, the sanding mechanism 50 will be described.

Inside the housing 100, a drive roll 51 is provided on the upper portion and a guide roll 52 is provided on the lower portion.
And a sanding roll 53 is provided, and an endless sanding belt 54 is stretched between them.
The drive roll 51 is driven by a motor (not shown) so that the sanding belt 54 travels in the arrow B direction opposite to the traveling direction of the material feeding belt 11 (direction of arrow A in the figure) on the sanding surface of the work. And the guide roll 52 and sanding roll 53
The work is ground (polished) in the sanding region between and.

Between the guide roll 52 and the sanding roll 53 which are arranged below the sanding mechanism 50, a tread pad 55 corresponding to an air cushion type tread member is provided. This is located on the back side of the sanding belt 54, and the sanding belt 54 is located below (work side).
It has the function of energizing.

A plurality of pressing rolls 56 are provided on both the left and right sides of the guide roll 52 and the sanding roll 53, and although not shown, their pivots are supported so as to be vertically movable, and are attached downward by a compression coil spring. It is energized.

As shown in FIG. 3, a dust suction duct 57 extends vertically and is arranged on the approaching side of the work in the sanding area (the right side of the sanding roll 53 in FIG. 2), and the upper part thereof is led out upward from the housing 100. It is connected to the suction side of a dust collecting fan (not shown). In addition, the dust suction duct 5
A guide duct 58 is connected to the lower end of 7, and its tip is inserted between the sanding roll 53 and the pressing roll 56 adjacent to the sanding roll 53 and opens toward the sanding roll 53 side in the front upper part thereof. The guide duct 58 has a width dimension wider than the lateral width of the sanding belt 54 and opens in a thin slit shape.

On the other hand, on the work discharge side of the sanding area (that is, on the left side of the guide roll 52 in FIG. 2), a dust collecting hopper 59 is also arranged so as to extend vertically, and the upper portion thereof is led out upward from the housing 100. Is connected to the suction side of a dust collection fan (not shown), and the lower end of the dust collection fan is widened toward the end to open above the two pressing rolls 56. Further, the lower end opening of the dust collecting hopper 59 also has a width dimension wider than the lateral width of the sanding belt 54.

[0025] Incidentally, the left side in the drawing is a discharge side of the word over click, the rotary brush 60 and the rubber roll 61 are provided in order. The rotary brush 60 has a function of being driven by a motor (not shown) to remove the chips adhering to the surface of the work, and the rubber roll 61 has adhesiveness on the surface and is driven to rotate in contact with the surface of the work. It has a function of adhering and removing the chips of the work surface to the rubber roll 61 side.

The housing 100 also includes a door 6 for inspection.
2 is attached so that it can be opened and closed.

<Work Transfer Device> Next, the work transfer device 10 will be described. This is the processing table 13 on the upper part of the base 12 installed on the floor.
Is configured to be movable up and down by the lifting device 14. Rolls 15 are provided at both ends of the processing table 13, and the material feeding belt 11 is stretched between the rolls 15 so as to come into contact with and move on the processing table 13.

The elevating device 14 is operated by turning on an operation switch (not shown) or rotating the operation handle 16, whereby the processing table 13 moves up and down and the feeding belt 11 and the sanding belt 54 are separated. The gap size can be set to a desired value.

Further, as shown in FIGS. 1 and 3, a large number of ventilation holes 17 are formed in the material feeding belt 11 so as to penetrate the front and back surfaces thereof. Incidentally, in this embodiment, the material feeding belt 11
Has a width of about 70 cm, and the vent hole 17 has a diameter of about 5 mm.

On the other hand, on the processing table 13, as shown in FIGS. 3 and 4, a position closer to the dust suction duct 57 than a position facing the pedal pressure pad 55, for example, the pedal pressure pad 55 and the sanding roll 53. A slit-shaped front exhalation port 18 is formed at a position corresponding to the middle. A slit-shaped rear air outlet 19 is also formed at a position corresponding to the dust collecting hopper 59.

On the back side of the processing table 13,
The vertical wall plate 13a, at the formation position of each of the air outlets 18 and 19,
Pressure chamber 2 composed of lateral wall plate 13b and bottom wall plate 13c
0 and 21 are formed, and the air outlets 18 and 19 are connected to the pressure chambers 20 and 21, respectively.
The pressure chambers 20 and 21 are connected to a turbo blower device (not shown) via ducts 22 and 23, for example, pressure air generated by a motor having an output of 1.5 kw is sent to the pressure chambers 20 and 21. Each exhalation port 18,
It is designed to eject from 19 upwards.

Next, the operation of this embodiment will be described.

First, the elevating device 14 provided in the work transfer device 10 is operated to move the processing table 13 to a desired height. This height 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 device 10 and related devices such as a dust collecting fan and a turbo blower device are activated,
The work to be ground is placed on the material feeding belt 11 and fed below the sanding mechanism 50. Then, the work is placed on the material feeding belt 11, enters the inside of the work insertion opening of the housing 100, and reaches the sanding region of the sanding mechanism 50. Then, the surface of the work is rubbed by the sanding belt 54, so that the work is ground.

When such a grinding process is performed, a large amount of chips are generated around the sanding area. In particular, since the sanding belt 54 runs to the right side in FIG. 1 in the sanding area, the chips are blown from the portion right below the sanding roll 53 toward the right side. At this position, the folding and sanding belt 54 winds around the sanding roll 53 and changes its direction upward, so that the chips follow the traveling direction of the sanding belt 54, as shown by arrow group X in FIG. Scatter slightly upward. For this reason, a large amount of chips generated during the sanding process of the work W is caused by the dust suction duct 5 which is open at the upper right of the sanding roll 53 as shown in FIG.
7 will be efficiently sucked into the guide duct 58.

Next, when the grinding of the work W progresses and the end of grinding is reached, the rear end of the work W comes to be positioned directly below the pedal pad 55, as shown in FIG. 1 (B). Then, the chips generated at the tread pad 55 portion are immediately vigorously released into the air without being pressed between the sanding belt 54 and the work W, and can freely fly. Moreover, the sanding belt 54, which runs at a high speed, causes strong wind in the direction of pushing the chips. Therefore, the chips generated immediately before the end of the grinding of the work W try to move straight from the rear end portion of the work W toward the right side in the drawing with a strong force as shown by the arrow Y in the drawing.

However, in this embodiment, at the end of the grinding of the work W, the rear end of the work W has finished passing the formation position of the front air discharge port 18 as shown in FIG. The pressurized air supplied from 18 penetrates through the vent holes 17 of the material feeding belt 11 and is blown out vigorously upward, forming an upward air flow as shown by an arrow group Z in the figure. Therefore, the above-mentioned chip discharge flow Y is pushed by the air flow Z from below to change the flow direction upward, and does not go straight toward the workpiece insertion opening, but also opens at the upper right of the sanding roll 53. The dust will flow into the guide duct 58 of the dust suction duct 57. As a result, chips at the final stage of grinding can also be efficiently sucked into the dust suction duct 57, and the abnormal leakage of chips can be reliably prevented.

Next, when the rear end of the work W reaches the position where it is separated from the sanding area, as soon as the rear end of the work W passes through the rear air outlet 19, the rear air outlet 19 and the material feeding belt 11 are provided. A strong airflow is generated which flows through the ventilation holes 17 of the above and linearly flows into the upper dust collecting hopper 59. As a result, in this type of sanding machine, even if there is a situation in which chips tend to harden and adhere to the rear end of the work W like eaves, in the present embodiment, the lumps of chips are blown off by a strong air flow. Therefore, the chips can be more reliably removed from the work.

The chips adhering to the surface of the work W are removed by the rotating brush 60, and the adhesive rubber roll 61 rolls on the surface of the work W, whereby the chips adhere to the work W. The work W is completely removed.

As described above, according to this embodiment, since the ventilation hole 17 is formed in the material feeding belt 11 and the front air outlet 18 is formed in the working table 13, the front air outlet 1 is formed at the end of the grinding of the workpiece.
The air ejected from No. 8 penetrates the material feeding belt 11 and flows toward the dust suction duct 57 side. For this reason, the discharge flow of chips generated at the end of grinding is surely guided by the guide duct 58.
Since it can be sucked in, the leakage of cutting chips can be surely prevented.

In the rear of the sanding area, the rear air outlet 19 is formed on the processing table 13,
Chips on the trailing edge of the work W can be removed by multiplying by the air flow supplied from here, and since the adhesive rubber roll 61 is provided behind the rotating brush 60, the chips on the surface of the work W must be removed sufficiently. The ability to remove chips from the work is also improved. (Second Embodiment) FIG. 6 shows a second embodiment. The difference between this and the first embodiment is that the processing table 70 has a main air outlet 71 and an auxiliary air outlet 72.
There are two air outlets for ejecting pressured air. Since other configurations are similar to those of the first embodiment, the same parts are designated by the same reference numerals and the duplicated description will be omitted.

In this embodiment, the main air outlet 71 is the first
Similar to the front exhaust port 18 of the embodiment, it is located at a position corresponding to an intermediate position between the pedal pressure pad 55 and the sanding roll 53, and the auxiliary exhaust port 72 is located at a position corresponding to the opening of the guide duct 58. Further, both the air outlets 71 and 72 are connected to the pressure chambers 73 and 74, and the pressure air is supplied from a blower device (not shown).

With this structure, an air flow from the auxiliary air outlet 72 through the ventilation hole 17 of the material feeding belt 11 toward the opening of the guide duct 58 is also generated. The discharge flow of the chips discharged rearward from the rear end portion is bent in the direction by the air flow from the main air outlet 71, and is further multiplied by the air flow from the auxiliary air outlet 72 toward the guide duct 58. As a result, the air is surely sucked into the opening of the guide duct 58. Further, even during grinding, a large amount of air can be supplied from the two air outlets 71 and 72 to the vicinity of the sanding region, so that a rich air flow toward the guide duct 58 can be generated and the dust collection efficiency is improved. .

In the first embodiment, the rear air outlet 19 is formed on the working table 13 also behind the sanding area, and the rubber roll 61 is provided behind the rotary brush 60, but these are not always provided. Without
Even if the ventilation hole 17 is formed in the material feeding belt 11 and the front air outlet 18 is provided in the processing table 13, the intended purpose can be achieved.

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

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a main part showing a state of dust collection during grinding by a wide belt sander according to a first embodiment of the present invention.

[Fig. 2] Overall front view

FIG. 3 is a partial vertical sectional view showing a main part of a sanding mechanism.

FIG. 4 is a plan view of a processing table.

FIG. 5 is a partial vertical cross-sectional view showing a main part of a second embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 1 showing a state of dust collection during grinding in a conventional wide belt sander.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Work transfer mechanism 11 ... Material feeding belt 13 ... Processing table 17 ... Vent hole 18 ... Front air outlet (air outlet) 19 ... Rear air outlet 50 ... Sanding mechanism 53 ... Sanding roll 54 ... Sanding belt 55 ... Tread pad 57 ... Dust suction duct 71 ... Main air outlet 72 ... Secondary air outlet W ... Work

Claims (2)

(57) [Scope of utility model registration request] 1. A work conveying mechanism, which is provided so as to be capable of traveling in contact with a processing table and conveys a work by the material feeding belt, and an endless sanding belt hung between a plurality of rollers. And a sanding mechanism for polishing and grinding the work by pressing the sanding belt against the work by a treading member while traveling in a direction opposite to the conveying direction of the work, and the sanding mechanism is provided on the work entrance side of the sanding mechanism. In the one provided with a dust suction duct for sucking chips generated along with grinding and polishing of the work together with the ambient air, the machining table is located closer to the dust suction duct than a position facing the treading member. In addition to forming a discharge port for discharging pressurized air, the material feeding belt has a large number of ventilation holes. Wide belt sander which is characterized in that form. 2. A work conveying mechanism, which is provided in contact with a processing table so that a material feeding belt can travel, and conveys a work by the material feeding belt, and an endless sanding belt which is stretched between a plurality of rollers. And a sanding mechanism for polishing and grinding the work by pressing the sanding belt against the work by a treading member while traveling in a direction opposite to the conveying direction of the work, and the sanding mechanism is provided on the work entrance side of the sanding mechanism. In a thing provided with a dust suction duct for sucking chips generated along with grinding and polishing of a work together with ambient air, the machining table is located closer to the dust suction duct than a position facing the pedaling member. To the main air outlet that discharges the compressed air and to the position corresponding to the intake part of the dust suction duct. A wide belt sander characterized in that a secondary air outlet for discharging air is formed and a large number of vent holes are formed in the material feeding belt.