JPH0740244A - Dust collecting device for sanding machine' - Google Patents

Abstract

PURPOSE:To prevent chips from going through below a dust collecting duct mounted the chip discharging side of a sanding area and locking outside a machine. CONSTITUTION:A displaceable shielding plate 33 is mounted adjacent to the suction aperture 32 of a dust collecting duct 31. The shielding plate 33 is in a first shielding position (shown by solid lines) for obstructing passing of chips across a range from the dust collecting duct 31 to the upper face of a work W while the work W is passing below the shielding plate 33. And the shielding plate 33 is displaced in a second shielding position (shown by chain lines) for obstructing passing of the chips across the range from the dust collecting duct 31 to the carriage belt 11 after the work passes the shielding plate 33.

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 the work enters the sanding area and is sandwiched between the sanding belt and the transport surface by the treading pad, the upper surface of the work is polished and ground by the sanding belt. ing.

In this type of belt sander, a dust collecting mechanism is provided to prevent a large amount of chips generated during sanding from scattering outside the machine and deteriorating the working environment. There are the following. This is because when the sanding belt travels in the work entering direction opposite to the work conveying direction, a dust collecting duct is provided on the work entering side of the sanding area, that is, the chip discharge side, to collect the chips blown off by the sanding belt. That is, the airflow that flows into the dust duct is multiplied to be sucked.

[0004]

In such a dust collecting mechanism, the dust collecting duct is arranged so as to open at a position higher than the upper surface of the work in order to avoid interference with the work.
It is inevitable that there is a gap between the upper surface of the work and the opening of the dust collection duct even while the work is passing directly under the dust collection duct. Therefore, a part of the chips blown out from the sanding area is disengaged from the air flow flowing into the dust collection duct due to the repelled momentum, and passes through the gap between the upper surface of the work and the opening of the dust collection duct. Could not be prevented from leaking out of the aircraft. At this time, even if there is a pressing roll that contacts the upper surface of the workpiece and rotates on the chip discharge side of the dust collecting duct, the chips that hit the pressing roll are repelled and the pressing roll and the dust collecting There was a possibility of leaking out of the machine through the gap between the duct.

Further, after the rear end of the work passes under the dust collecting duct and separates toward the sanding region side, a larger gap than the above occurs between the dust collecting duct and the conveying surface. However, since the rear end of the work is in the sanding area and sanding is performed for a certain period of time after the work passes under the dust collecting duct, chips are continuously generated. For this reason, a considerable amount of the chips blown out from the sanding area escapes from the machine through the gap between the transport surface and the dust collecting duct, deviating from the air flow flowing into the dust collecting duct. There was a problem.

[0006]

As a means for solving the above-mentioned problems, the invention according to claim 1 polishes a work sent into a sanding area by a work transfer mechanism while sandwiching the work between a transfer surface and a sanding belt.・ In the case where a dust collecting duct for grinding and sucking chips generated by polishing and grinding of the work together with the surrounding air is provided on the chip discharge side of the sanding belt, a shielding plate is provided near the dust collecting duct. This shield plate prevents the chips generated from the sanding area from being discharged to the outside of the machine through the gap between the dust collection duct and the work when the work is in the position corresponding to the work. When the work is separated from the position corresponding to the shield plate to the sanding area side, the cutting dust passes through the gap between the dust collecting duct and the transfer surface. The prevents the discharged into 2
It is characterized in that it is provided so as to be displaceable between the shield position and the shield position.

According to a second aspect of the invention, in the invention according to the first aspect, the shield plate is always biased toward the second shield position, and at the second shield position, the shield plate interferes with the transport surface. This is characterized in that a regulation means for preventing the above is provided.

[0008]

In the invention according to claim 1, the shield plate is displaced to the first shield position when the work is at the position corresponding to the shield plate, and the shield plate displaced to the first shield position causes
The chips generated from the sanding area are prevented from being discharged to the outside of the machine through the gap between the dust collecting duct and the work. Further, when the work separates from the position corresponding to the shielding plate to the sanding region side, the shielding plate is displaced to the second shielding position, and the shielding plate displaced to the second shielding position collects chips generated from the sanding region. It is prevented from being discharged to the outside of the machine through a gap formed between the duct and the transport surface.

According to the second aspect of the present invention, when the shield plate is displaced in the direction of the second shield position by the biasing force, the shield plate comes close to the transport surface, but interference between the shield plate and the transport surface is prevented by the restricting means. To be done.

[0010]

As described above, according to the present invention, in both the state where the work is in the position corresponding to the shielding plate and the state where the work is separated from the position corresponding to the shielding plate to the sanding region side, Since it is possible to prevent the chips from passing under the dust collection duct and leaking out of the machine, it is possible to improve the efficiency of collecting the chips and also to prevent the chips from scattering outside the machine. This has an excellent effect that it is possible to prevent the deterioration of the work environment due to.

In particular, according to the second aspect of the present invention, it is possible to prevent the shield plate from interfering with the transport surface when the shield plate is displaced to the second shield position, so that the transport surface is stretched between the rolls for traveling. Even when it is configured by the material feeding belt, it has an excellent effect that it is possible to avoid a defect such as abrasion due to contact of the shielding plate with the traveling material feeding belt.

[0012]

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

As shown in FIG. 1, the overall construction is such that a sanding mechanism 20 and a dust collecting mechanism 3 are provided above the work transfer mechanism 10.
0 is provided, and these are connected and integrated by the housing 1, and the work conveying mechanism 10 is provided with a material feeding belt 11 extending in the left-right direction in the drawing.

<Work Transfer Mechanism 10> First, the work transfer mechanism 10 will be described. This is a configuration in which a processing table 13 is vertically movable by an elevating device 14 above a base 12 installed on the floor. Processing table 1
Rolls 15 are provided at both ends of the sheet feeding member 3, and the material feeding belt 11 is stretched between the rolls 15 so as to come into contact with and travel on the processing table 13. The work W is conveyed in the direction of arrow A in the figure while being placed on the material feeding belt 11.

The elevating device 14 is operated by turning on an operation switch (not shown) or rotating the operation handle 16, whereby the working table 13 is moved up and down to bring the material feeding belt 11 to a desired height. It can be set.

<Sanding Mechanism 20> Next, the sanding mechanism 20 will be described.

Inside the housing 1 to which the openable / closable inspection door 2 is attached, a drive roll 21 is provided in the upper part, and a guide roll 22 and a sanding roll 23 are provided in the lower part, and an endless space is provided between them. The sanding belt 24 of is hung. The drive roll 21 is driven by a motor (not shown) so that the sanding belt 24 travels in the sanding region between the guide roll 22 and the sanding roll 23 in the direction opposite to the conveying direction of the material feeding belt 11. Thus, the work W is ground or polished while being sandwiched between the sanding belt 24 and the material feeding belt 11.

An air cushion type tread pad 25 is provided between the guide roll 22 and the sanding roll 23 which are arranged below the sanding mechanism 20. This is located on the back surface side of the sanding belt 24 and has a function of urging the sanding belt 24 downward (work side).

Pressing rolls 26L and 26R are provided on the left and right sides of the guide roll 22 and the sanding roll 23, respectively, and although not shown, their pivots are supported so as to be movable up and down and urged downward by a compression coil spring. Has been done. <Dust Collection Mechanism 30> Next, the dust collection mechanism 30 will be described.

On the entry side of the work W in the sanding region, that is, on the discharge side of the chips generated by the polishing and grinding of the work W (the right side of the sanding roll 23 in FIG. 1), the chips discharged from the sanding region. A dust collecting duct 31 for sucking air is arranged to extend vertically. The upper part of the dust collecting duct 31 is led out upward from the housing 1 and connected to the suction side of a dust collecting fan (not shown). Further, the suction port 32 at the lower end of the dust collection duct 31 is located above the sanding roll 23 and the pressing roll 26R, and has a length extending laterally further than both side edges of the sanding belt 24 in the width direction of the sanding belt 24. It opens in a direction facing the chip discharge side.

In the vicinity of the suction port 32 of the dust collecting duct 31,
The shielding plate 33 for preventing the discharged chips from passing under the dust collecting duct 31 is provided in a posture in which the shielding plate 33 extends obliquely downward from the edge of the suction port 32 on the chip discharge side toward the sanding roll 23 side. It is displaceable. The upper edge of the shield plate 33 has a bearing 3 fixed to the housing 1.
It is fixed to a rotary shaft 35 which is freely rotatably provided between the rollers 4 and 34 in the horizontal direction perpendicular to the conveying direction.
The shield plate 33 can swing integrally with the rotary shaft 35 so that the lower end side of the shield plate 33 moves up and down around its upper edge. Further, due to its own weight, the shield plate 35 is constantly subjected to an urging force in the direction in which the lower end side near the sanding roll 23 is lowered.

On one end side of the rotary shaft 35, stopper pins 38, 38 are screwed so as to oppose to a pair of holding plates 37, 37 projecting from a bracket 36 fixed to the housing 1. The locking plate 39 which is fixed so as to be rotatable integrally and protrudes in the radial direction is provided with the stopper pins 3
It is provided between 8 and 38. The swinging range of the shielding plate 33 is limited by the abutment of the locking plate 39 with the stopper pin 38, so that the shielding plate 33 is prevented from interfering with the sanding belt 24 when the shielding plate 33 moves upward, and at the same time, the feeding belt. Even when the position of 11 is greatly lowered, the shielding plate 33 is kept in an oblique posture. The swing range can be adjusted by rotating the stopper pin 38 and changing the length of protrusion to the locking plate 39 side.

At the other end of the rotary shaft 35 opposite to the stopper pin 38, the shield plate 33 is prevented from interfering with the material feeding belt 11 when the shield plate 33 is swung downward due to its own weight. A regulation mechanism 40 is provided. Explaining the configuration, an arm 41 extending in substantially the same direction as the shielding plate 33 is fixed to the other end of the rotary shaft 35 so as to rotate integrally, and a locking roller 42 is supported at the lower end of the arm 41. Has been done. On the other hand, on the side surface of the processing table 13 of the work transfer mechanism 10, a receiving block 43 corresponding to the lower side of the locking roller 42 of the arm 41 is attached by a bolt 45 penetrating the elongated hole 44. The height of the receiving block 43 can be adjusted by moving the elongated hole 44 up and down with respect to the bolt 45. In this embodiment, when the shield plate 33 moves downward, the locking roller 42 of the arm 41 is placed on and abuts on the top surface of the receiving block 43 when the lower end of the shield plate 33 comes very close to the top surface of the material feeding belt 11. The shielding plate 33 is adjusted so as not to come into contact with the material feeding belt 11.

On the work discharge side of the sanding area (that is, on the left side of the guide roll 22 in FIG. 1), the work W is
A limit switch 52 for detecting the passage of the work W by pushing up the treading roll 51 by means of is provided, and a dust collecting hood 53 provided on the work discharge side thereof is driven by a motor (not shown) to upper surface of the work W. A rotary brush 54 for removing the chips adhering to the sheet and a cleaning head 55 for ejecting pressure air from an air outlet (not shown) having a slit shape perpendicular to the conveying direction are provided. The direction of the air outlet of the cleaning head 55 with respect to the workpiece W is adjusted by an air cylinder 56, and the operation of the air cylinder 56 is controlled by a control device (not shown) based on a detection signal from the limit switch 52. It In such a mechanism, chips adhering to the upper surface of the work W after sanding are removed by being rubbed by the rotary brush 54 and being blown with pressurized air discharged from the cleaning head 55.

Next, the operation of this embodiment will be described.

First, the lifting device 14 of the work transfer mechanism 10
Is operated to move the material feeding belt 11 to a required height. This height is the thickness of the work W and the required "cut off"
It is determined in consideration of the above and can be set while observing a known gauge (not shown). After this, the work transfer mechanism 1
0 and related devices such as a dust collection fan are started.

When the work W is not transported, the locking roller 42 of the arm 41 locks on the upper surface of the receiving block 43 as the shield plate 33 moves downward due to its own weight. It is displaced to a state (second shielding position) shown by a chain line in FIGS. 2 and 3 with a very small gap between the lower end and the upper surface of the material feeding belt 11. Shield plate 3
In the state where 3 is in the second shielding position, the shielding plate 33 is located between the space below the sanding roll 24 and the space in which the pressing roll 26R on the chip discharge side is located. The space between the two spaces by the plate 33 is from the upper surface of the material feeding belt 11 to the suction port 3 of the dust collecting duct 31.
It is shielded over a range of up to 2.

From this state, the work W is fed with the material feeding belt 11
When the workpiece W is placed and conveyed, the front end edge of the work W is shielded by the shield plate 33.
Shielding plate 3 while pushing it up as if diving underneath
Pass under 3. The shield plate 33 that has been pushed up and rocked upward is displaced to the state (first shield position) shown by the solid line in FIG. 2 with its lower end in contact with the upper surface of the work W. In the state where the shielding plate 33 is in the first shielding position, it is between the substantially wedge-shaped space formed by the sanding belt 24 and the upper surface of the work W and the space where the pressing roll 26R on the chip discharge side is located. Since the shielding plate 33 is located, the space between the two spaces is shielded by the shielding plate 33 from the upper surface of the work W to the suction port 32 of the dust collecting duct 31.

In this state, the rear end of the work W has the shield plate 33.
Continue until it comes off the bottom edge of. During this time, the chips that are generated and blown off between the sanding belt 24 and the upper surface of the work W by polishing / grinding the work W are blocked by the shielding plate 33 located in the front in the ejection direction. That is, the air flows into the dust collecting duct 32, moves along the upper surface of the shielding plate 33, and is sucked into the suction port 32 of the dust collecting duct 31. Therefore, the cutting chips do not pass below the dust collection duct 31 and are not discharged to the outside of the machine.

After that, when the rear end of the work W is disengaged from the lower end of the shielding plate 33 and separated toward the sanding belt 24,
At the same time, the shield plate 33 is displaced to the second shield position by swinging downward due to its own weight. Even after the shielding plate 33 is displaced to the second shielding position, the generation of chips continues because the sanding process for the rear end portion of the work W is left. However, since the cutting chips are blocked by the shield plate 33 located in the front in the protruding direction, the chips move along the upper surface of the shield plate 33 while being carried by the airflow flowing into the dust collection duct 31. Is sucked into the suction port 32. Therefore, the cutting chips do not pass below the dust collection duct 31 and are not discharged to the outside of the machine.

As described above, in the present embodiment, while the work W is being sanded, the chips generated by the sanding always pass below the dust collecting duct 31 and leak out of the machine. Since it is prevented, the dust collection efficiency of the chips is extremely high, and further, the deterioration of the working environment due to the scattering of the chips outside the machine is prevented.

Further, since the regulating mechanism 40 is provided, when the shielding plate 33 is displaced downward to the second shielding position as the work W passes, the shielding plate 33 and the material feeding belt 11 are moved.
Therefore, there is no possibility that the traveling material feeding belt 11 and the shielding plate 33 will come into contact with each other to cause abrasion. Moreover, the regulation mechanism 40 has a configuration in which the receiving block 43 for determining the height of the lower end of the shielding plate 33 at the second shielding position is fixed to the processing table 13 that is vertically elevated together with the material feeding belt 11. . Therefore, even when the height of the material feeding belt 11 changes due to the change in the thickness of the work W and the size of the "cutting margin", the shielding plate 3
3 can be prevented from interfering with the material feeding belt 11.

The present invention is not limited to the above embodiment, but may be modified and implemented as follows, for example. (1) In the above-described embodiment, the shield plate 33 is displaced by rotating it. However, according to the present invention, the method of displacing the shield plate is not limited to rotation, but is maintained at a constant inclination, for example. Other forms such as sliding or sliding while changing the tilt angle are possible. (2) In the above embodiment, the case where the shielding plate 33 is in an oblique posture with respect to the conveying surface of the material feeding belt 11 has been described. However, according to the present invention, the shielding plate 33 may be in a posture perpendicular to the conveying surface. It is also possible to (3) In the above embodiment, the dead weight of the shield plate 33 was used as the biasing means for displacing the shield plate 33 to the second shield position, but other means such as spring force may be used. . (4) In the above-described embodiment, the displacement of the shield plate 33 is performed by the natural downward movement due to its own weight and the pushing up by the front edge of the work, but the displacement of the shield plate drives the motor, the air cylinder, etc. It is also possible to use a driving mechanism as a power source and perform control based on various conditions such as the thickness, length, and transport speed of the work. (5) In the above embodiment, as shown in the figure, the shield plate 3
Although the upper surface of 3 is flat, according to the present invention, the surface of the shielding plate may be, for example, a curved surface that draws a smooth arc, whereby the flow of air flowing into the dust collecting duct can be reduced. It becomes possible to improve the suction efficiency of the chips to the dust collecting duct by changing the flow characteristics. (6) In the above embodiment, the shield plate 33 is described as being made of a plate material that hardly deforms, but a shield plate made of a flexible and flexible plate material is used to make it look like a curtain. It is also possible to provide so that it may hang down from the opening of the dust collection duct. In this case, the shielding plate is flexibly deformed, so that the shielding plate is displaced between the first and second shielding positions. (7) In the above embodiment, the case where the upper surface of the work W is sanded has been described, but the present invention can be applied to the case where the side surface of the work is sanded.

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.

FIG. 2 is an enlarged front view showing the operation of essential parts.

FIG. 3 is an enlarged right side view of a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Work conveyance mechanism 11 ... Material feeding belt (conveyance surface) 24 ... Sanding belt 31 ... Dust collection duct 33 ... Shielding plate 40 ... Regulation mechanism W ... Work

Claims (2)

[Claims] 1. A workpiece which is sent to a sanding area by a workpiece transport mechanism is sandwiched between a transport surface and a sanding belt for polishing and grinding, and chips generated by polishing and grinding the workpiece are sucked together with ambient air. In the one in which a dust collecting duct for doing so is provided on the chip discharge side of the sanding belt, a shielding plate is provided in the vicinity of the dust collecting duct, and the shielding plate is provided at a position corresponding to the shielding plate. A first shielding position for preventing chips generated from the sanding region from being discharged to the outside of the machine through a gap between the dust collecting duct and the work; and a position where the work corresponds to the shielding plate. To prevent the chips from being discharged to the outside of the machine through a gap formed between the dust collecting duct and the conveying surface when the chips are separated from the sanding region side. A dust collecting device for a sanding machine, which is displaceably provided between two shielding positions. 2. The shielding plate is always urged toward the second shielding position, and is provided with a restricting means for preventing interference between the shielding plate and the transport surface at the second shielding position. The dust collecting device for a sanding machine according to claim 1.