JPH0531862U - Wide belt sander - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the leakage of cutting chips from the housing by reliably collecting the cutting chips. A dust suction duct 57 is arranged to extend vertically on the work entry side of the sanding region (on the front side of the sanding roll 53) and is connected to the suction side of a dust collection fan. A large number of ventilation holes 17 are formed through the front and back of the material feeding belt 11, and a discharge port 18 for discharging pressurized air is formed in the processing table 13 at a position closer to the dust suction duct 57 than the tread pad 55. Due to the air flow that passes through the material feeding belt 11 from the air discharge port 18, the flow direction of the discharge flow of the chips discharged backward from the rear end of the workpiece at the final stage of grinding is changed to the dust suction duct 57 side. Like

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wide belt sander with an improved chip collecting structure on the front side of the sanding area.

[0002]

[Prior Art]

 The general structure of a wide belt sander used for polishing and grinding woodwork and resin materials is as follows.

A processing table is provided at the bottom of the main frame, and an endless 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 over the main frame in the direction above and above the material feeding belt, and is placed on the back side of the sanding belt above the work passage area to tread the pad or the like. Provide a member. The sanding belt is driven by the motor in a direction opposite to the direction in which the work is conveyed, and at that time, the pad is pressed against the work to polish and grind the surface of the work.

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

With this configuration, the work W is placed on the material feeding belt 4 on the processing table 3 and conveyed in the arrow A direction, and the sanding belt 1 travels in the arrow B direction. Therefore, during grinding / polishing of the work W, the 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, as the folding and winding sanding belt 1 winds up around the sanding roll 5 and changes its direction upwards, it slightly scatters upwards as shown by an arrow C group in FIG. For this reason, 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]

[Problems to be solved by the device]

 By the way, in recent years, there has been a particularly strong demand for improvement in the working environment, and extremely high dust collection performance is also required for this type of sanding machine. From this point of view, when evaluating the conventional wide belt sanders, the reality is that they are still insufficient.

For example, in this type of belt sander, when a work is placed on a material feeding belt and fed into the sanding area from the work insertion port, the cutting chips are sufficiently collected while the work is being ground (polished). Although it does not leak out from the housing of the sanding mechanism, there is a phenomenon that after the grinding is completed, the chips become a mist from the work insertion port and are temporarily expelled out of the machine. Since this 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 abnormal leakage phenomenon 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 tread 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 of the sanding belt 1 in the traveling direction and the sanding roll 5, the generated chips are generated by the sanding belt 1. Has been suppressed by. It is the right side portion of the sanding roll 5 in the figure where the sanding belt 1 is separated from the work W where the large amount of chips are released from being held by the sanding belt 1. However, in this part, the sanding belt 1 changes its direction upwards, so that the chips are also emitted upwards along the running direction of the sanding belt 1, which is convenient as shown in FIG. 6 (A). It often flows toward the opening of the dust suction duct 2. Therefore, during the grinding of the work W, the abnormal leakage of chips does not occur.

However, at the end 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 tread pad 6 portion are immediately and vigorously discharged into the air without being pressed between the sanding belt 1 and the work W, and can fly freely. Moreover, the sanding belt 1, which runs at high speed, causes strong wind in the direction of pushing the chips. For this reason, the chips generated at the end of the grinding of the work W move straight forward with a strong force from the rear end of the work W toward the work insertion opening side as shown by the arrow D group in the figure. Part of it 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 the leakage of chips from the housing as much as possible.

[0011]

[Means for Solving the Problems]

 The wide-belt sander of the present invention is provided with a feeding belt which is in contact with a processing table so that the feeding belt can travel, and a work feeding mechanism for feeding a work by the feeding belt and an endless sanding belt which is stretched between a plurality of rollers. A sanding mechanism that grinds and grinds the work by pressing the sanding belt against the work while pressing the sanding belt against the work while traveling on the sanding surface of the work in the direction opposite to the conveying direction of the work, and entering the work of the sanding mechanism. It is equipped with a dust suction duct that is installed on the side to suck the chips generated by grinding and polishing of the work together with the ambient air. An air outlet for discharging pressurized air is formed at a position near the duct, and a large number of vent holes are provided in the material feeding belt. Characterized in place form a (the invention of claim 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 a 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. You may make it provide the sub-exhaust port which discharges (invention of Claim 2).

[0013]

[Action]

 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 region of the sanding mechanism as the material feeding belt travels. Here, since the processing table is formed with a discharge port for discharging pressurized air, and the material feeding belt is formed with a large number of ventilation holes, the rear end of the work should be positioned ahead of the discharge port. At the time of being conveyed to, the air outlet is opened, and the pressure air from the air outlet passes through the ventilation hole of the material feeding belt and is discharged to the sanding belt side. Further, since the exhaust port is formed at a position closer to the dust suction duct than the position facing the treading member, the work piece has to pass through the sanding area after the rear end of the work is sent ahead of the exhaust port. Become. Therefore, when 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 grinding the workpiece, the rear end The strong discharge flow of the chips discharged backward from the part is bent in the flow direction by the above-mentioned air flow, comes out from the work insertion port and goes toward the dust suction duct, and the leakage is prevented.

According to the wide belt sander in which the auxiliary air outlet is provided in addition to the main air outlet as in the second aspect of the invention, according to the second air outlet, the auxiliary air outlet passes through the ventilation hole of the material feeding belt and the air intake portion of the dust suction duct. An air flow towards the will also be generated. Therefore, the discharge flow of chips discharged backward from the rear end of the work is bent by the air flow from the main exhaust port, and the air flowing from the sub-exhaust port into the dust suction duct. It will be sucked into the dust suction duct more reliably by taking advantage of the flow.

[0015]

[Effect of the device]

 As described above, according to the wide belt sander of the first aspect, the direction of the discharge flow of the chips generated at the final stage of grinding (polishing) of the work is directed toward the dust suction duct side by the air flow passing through the ventilation holes of the material feeding belt. Therefore, there is an excellent effect that it is possible to reliably prevent 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 This has the effect of making it even more reliable to prevent leakage to the outside of the aircraft.

[0017]

【Example】

 First Embodiment Hereinafter, a first embodiment embodying the present invention will be described with reference to FIGS. 1 to 4.

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 material feeding belt 11 is provided so as to extend 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 in the upper part, and a guide roll 52 and a sanding roll 53 are provided in the lower part, and an endless sanding belt 54 is stretched between them. .. The drive roll 51 is driven by a motor (not shown), whereby the sanding belt 54 travels on the sanding surface of the workpiece in the direction of arrow B, which is opposite to the traveling direction of the material feeding belt 11 (direction of arrow A in the figure). As a result, the work is ground (polished) in the sanding region between the guide roll 52 and the sanding roll 53.

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 tread member is provided. This is located on the back surface side of the sanding belt 54 and has a function of urging the sanding belt 54 downward (workpiece side).

A plurality of pressing rolls 56 are provided on the left and right sides of the guide roll 52 and the sanding roll 53, and although not shown, their pivots are supported so that they can move up and down, and are pressed downward by a compression coil spring. Being energized.

As shown in FIG. 3, a dust suction duct 57 is arranged to extend vertically on the approaching side of the work in the sanding region (the right side of the sanding roll 53 in FIG. 2), 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). A guide duct 58 is connected to the lower end of the dust suction duct 57, and the tip of the guide duct 58 is inserted between the sanding roll 53 and the pressing roll 56 adjacent thereto, and opens toward the sanding roll 53 side in the front upper part thereof. ing. The proposed 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. It is connected to the suction side of a dust collecting fan (not shown), and the lower end of the dust collecting fan widens toward the end and opens above the two pressing rolls 56. 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.

A rotating brush 60 and a rubber roller 61 are sequentially provided on the left side of the drawing, which is the discharge side of the work. The rotating 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 and is driven to rotate in contact with the surface of the work. Therefore, it has a function of adhering the cutting chips on the surface of the work to the rubber roll 61 side to remove it.

An inspection door 62 is attached to the housing 100 so as to be openable and closable.

<Work Transfer Device> Next, the work transfer device 10 will be described. This is a structure in which a processing table 13 is vertically movable by an elevating device 14 on an upper part of a base 12 installed on the floor. Rolls 15 are provided at both ends of the working 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 working table 13.

The elevating device 14 is operated by turning on an operation switch (not shown) or rotating the operation handle 16, which causes the processing table 13 to move up and down to move the material feeding belt 11 and the sanding belt 54. 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. By the way, in this embodiment, the width dimension of the material feeding belt 11 is about 70 cm, and the diameter of the ventilation hole 17 is about 5 mm.

On the other hand, as shown in FIGS. 3 and 4, on the processing table 13, 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 an intermediate position between and. Further, a slit-shaped rear discharge port 19 is also formed at a position corresponding to the dust collecting hopper 59.

Then, on the back surface side of the processing table 13, pressure chambers 20 and 21 composed of a vertical wall plate 13a, a horizontal wall plate 13b and a bottom wall plate 13c are formed at the positions where the respective discharge ports 18 and 19 are formed. 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, and the pressure air generated by, for example, a motor having an output of 1.5 kw is sent to the pressure chambers 20 and 21. This is ejected upward from each of the air outlets 18 and 19.

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 conveying device 10 and the associated devices such as the dust collecting fan and the turbo blower device are activated, and 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 housing 100 through the work insertion opening, and reaches the sanding region of the sanding mechanism 50. Then, the surface of the work is rubbed by the sanding belt 54, and the work is ground.

When such a grinding process is performed, a large amount of chips are generated around the sanding region. Particularly, 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. Since the folding and sanding belt 54 winds around the sanding roll 53 at that position and changes its direction upwards, the chips follow the traveling direction of the sanding belt 54 and are indicated by arrow group X in FIG. So that it scatters slightly upward. For this reason, a large amount of chips generated during the sanding process of the work W is efficiently sucked into the guide duct 58 of the dust suction duct 57 that is open at the upper right of the sanding roll 53 as shown in the figure. Become.

Next, when the grinding of the work W progresses and reaches the end of grinding, the rear end of the work W comes to be positioned directly below the pedal pad 55, as shown in FIG. 1B. Then, the chips generated at the treading pad 55 portion are immediately vigorously discharged 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 high speed, causes strong wind in the direction of pushing the chips. For this reason, the chips generated immediately before the grinding of the work W tends to move straight from the rear end 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 outlet 18, as shown in FIG. The pressure air supplied from 18 penetrates through the air holes 17 of the material feeding belt 11 and is blown out vigorously upward, forming an upward air flow as indicated by arrow group Z in FIG. For this reason, 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 is also opened 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 feeding bell. A strong airflow is generated that flows through the ventilation holes 17 of the fan 11 and flows straight into the upper dust collecting hopper 59. As a result, in this type of sanding machine, even if there is a situation in which cutting chips harden and adhere to the rear end of the work W like eaves, in the present embodiment, the cutting chips are blown away by a strong air flow. Therefore, the removal of chips from the work can be performed more reliably.

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 so that the chips adhere to it. Then, the work W is completely removed.

As described above, according to the present embodiment, since the ventilation hole 17 is formed in the material feeding belt 11 and the pre-exhaust port 18 is formed in the processing table 13, the pre-exhaust port 18 is formed at the end of the grinding of the workpiece. The jetted air penetrates the material feeding belt 11 and flows toward the dust suction duct 57 side. Therefore, the discharge flow of chips generated at the final stage of grinding can be surely sucked into the guide duct 58, and the leakage of chips can be reliably prevented.

In the rear of the sanding area, since the rear air outlet 19 is formed in the processing table 13, the air flow supplied from the rear air outlet 19 can be used to remove the chips at the rear edge of the work W, and Since the adhesive rubber roll 61 is provided behind the rotating brush 60, the chips on the surface of the work W can be sufficiently removed, and the ability to remove the chips from the work is improved. (Second Embodiment) FIG. 6 shows a second embodiment. The difference between this and the first embodiment is that the processing table 70 is provided with two air outlets for ejecting pressurized air from the main air outlet 71 and the auxiliary air outlet 72. Since the other construction is the same as that 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 located at a position corresponding to the middle between the treading pad 55 and the sanding roll 53, like the front air outlet 18 of the first embodiment, and the auxiliary air outlet 72 is a guide duct 58. It is located at the position corresponding to the opening. 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 configuration, an air flow that passes through the vent holes 17 of the material feeding belt 11 from the auxiliary air outlet 72 toward the opening of the guide duct 58 is also generated, so that the work W is finished at the end of grinding. The discharge flow of the chips discharged rearward from the rear end part is bent in the direction by the air flow from the main exhaust port 71, and further, from the sub-exhaust port 72 toward the guide duct 58. By being applied, the air is more reliably 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. To do.

In the first embodiment, the rear air outlet 19 is formed on the processing table 13 also behind the sanding area, and the rubber roll 61 is provided behind the rotary brush 60, but these are not always required. Even if it is not provided, even if the ventilation hole 17 is formed in the material feeding belt 11 and the pre-exhaust port 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)

[Scope of utility model registration request] 1. A work conveying mechanism for movably providing a material feeding belt in contact with a processing table, for conveying a work by the material feeding belt, and an endless sanding belt hung between a plurality of rollers to sand the work. 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 provided on the work entry 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 ambient air, the machining table is located closer to the dust suction duct than a position facing the pedaling 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 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. 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 provided on the work entry side of the sanding mechanism. With a dust suction duct for sucking chips generated along with grinding and polishing of the work together with ambient air, the processing table is located closer to the dust suction duct than to the position facing the pedaling member. To the main exhaust port that discharges compressed air and to the position corresponding to the intake part of the dust suction duct. A wide belt sander characterized in that a sub-exhaust port for discharging air is formed and a large number of vent holes are formed in the material feeding belt.