JPH0572362U - Sanding machine - Google Patents

Abstract

(57) [Summary] [Purpose] To enable efficient removal of chips adhering to the work. [Composition] An injection nozzle 6 for ejecting pressure air from an air compressor 66 on the work discharge side of the sanding region.
4 is provided, and the compressed air is jetted toward the work.
Therefore, even if the chips stick to the rear end of the workpiece,
It is stripped off by the pressure air that collided with shocking momentum. In this case, the position of the work is detected by using the work detection roll 57, and when the rear end of the work is sent near the injection nozzle 64, the solenoid valve 65 is opened and the pressure air is discharged. There is no waste of the compressed air, and a sufficient effect can be obtained by using the small air compressor 66.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sanding machine having an improved chip dust collecting structure on the rear side of a sanding area.

[0002]

[Prior Art]

 As a sanding machine used for polishing and grinding woodworking materials, resin materials, etc., there is, for example, a wide belt sander, and its general configuration 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 as a sanding member is laid over the main frame in the direction above and along the material feeding belt, and the pad is located above the work passing area and on the back side of the sanding belt. Providing a pedaling member such as. The sanding belt is driven by the motor in the direction opposite to the conveying direction of the work, 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, the following configuration is known. This is because a dust suction duct is provided in front of the sanding area by the sanding belt (work entry side), and a dust collecting hopper is placed on the rear side of the sanding area (work discharge side). The dust hopper is connected to the suction side of the dust collecting fan device to suck the chips together with the air in the front and rear sides of the sanding area.

In this way, most of the chips generated by the sanding belt grinding / grinding process are scattered around the work, so these are multiplied by the air flow sucked into the dust suction duct or the dust collecting hopper. It can be removed.

[0006]

[Problems to be solved by the device]

 However, for example, as shown in FIG. 10, when the work W is conveyed by the material feeding belt 1 in the direction of arrow A and the work W is ground by the sanding belt 2 traveling in the direction of arrow B, the rear end of the work W Chips may adhere to the parts as shown in the figure, and a deposit C of chips may be produced. In the past, such a deposit C could not be sucked into the dust-collecting duct or the dust-collecting hopper, so the worker had to remove it manually, which was a cause of lowering productivity. ..

The present invention has been made in view of the above circumstances, and it is therefore an object of the present invention to provide a sanding machine capable of efficiently removing chips adhering to a work.

[0008]

[Means for Solving the Problems]

 The sanding machine of the present invention is carried by a sanding mechanism that runs an endless sanding belt to polish and grind a work, a work transfer mechanism that sends a work to a sanding area by the sanding mechanism, and a work transfer mechanism. Work position detecting means for detecting the position of the work, a compressor for generating pressure air, an injection nozzle provided on the work discharge side of the sanding area for discharging pressure air from the compressor toward the work, A control means for controlling the discharge of the pressurized air from the injection nozzle based on the signal from the work position detecting means is provided (the invention of claim 1).

In addition to the above configuration, an intake port connected to the intake device may be provided at a position corresponding to the injection nozzle in the processing table, and a ventilation hole may be provided in the entire area of the transport belt of the work transport mechanism ( Invention of claim 2).

[0010]

[Action]

 According to the sanding machine of the first aspect, the work is conveyed by the work conveying mechanism, the work is polished and ground by the sanding mechanism, and the polished and ground work is sequentially discharged from the sanding region.

On the other hand, an injection nozzle for ejecting pressure air from the compressor is provided on the work discharge side of the sanding region, and pressure air is injected toward the work. Therefore, even chips adhering to the surface of the work, especially the rear end of the work, are peeled off from the work surface by the pressure air that collides with a strong force. Further, a work position detecting means for detecting the position of the work is provided, and the discharge of the pressure air from the injection nozzle is controlled based on the signal from the work position detecting means, so that the pressure air is injected only when necessary. Therefore, compressed air can be removed without waste, and even small compressors can remove chips with great force.

Further, according to the sanding machine of the second aspect, in particular, since the air flows through the ventilation hole of the conveyor belt and the intake port of the processing table so as to penetrate through the conveyor belt, the pressure air discharged from the ejection nozzle is discharged. The flow becomes smoother and the removal of chips becomes more efficient.

[0013]

[Effect of the device]

 The sanding machine of the present invention has the following effects. Since the compressed air generated by the compressor is blown onto the work carried out from the sanding area, the chips adhering to the work surface can be removed efficiently. Moreover, since the position of the work is detected and the compressed air is ejected in accordance with the detected position, the compressed air is not wasted, and a small compressor can be sufficiently used.

Further, with the structure in which the air flow passing through the processing table and the conveyor belt is generated, the chips can be removed more efficiently.

[0015]

【Example】

 Hereinafter, first to fourth embodiments embodying the present invention will be described with reference to the drawings. (First Embodiment) This embodiment is shown in FIGS. 1 to 6, and particularly the entire structure is shown in FIG. As shown in the figure, a sanding mechanism 50 is provided above the work transfer mechanism 10, and these are connected and integrated by a housing 70.

<Work Transfer Device> First, 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. Feeding rolls 15 and 16 are provided at both ends of the processing table 13, and the material feeding belt 11 is stretched between the feeding rolls 15 and 16 and moves in contact with the processing table 13.

The elevating device 14 is operated by turning on an operation switch (not shown) or by rotating the operation handle 14a, which causes the processing table 13 to move up and down, and the feeding belt 11 and the sanding mechanism 50. The gap size between can be set to a desired value.

As shown in FIG. 3, the processing table 13 is provided with a slit-shaped intake port 17 at a lower corresponding portion of the sanding mechanism 50, and the formation position of the intake port 17 is formed on the back surface side of the processing table 13. An intake chamber 18 is formed in the. The intake chamber 18 is connected to the intake side of a turbo blower device (not shown) via a duct 20 so that air can be sucked through the intake port 17 of the processing table 13. Further, as shown in FIGS. 4 and 5, a large number of vent holes 19 are formed in the material feeding belt 11 so as to penetrate the front and back sides and be scattered over almost the entire area. In this embodiment, the width of the material feeding belt 11 is about 70 cm and the diameter of the ventilation hole 19 is about 5 mm.

On the other hand, as shown only in FIG. 1, a rotary encoder 21 is provided in the vicinity of the feed roll 16 on the left side in FIG. 2 provided on the processing table 13, and between this and the feed roll 16. A belt 22 is stretched around. This allows the rotary encoder 21 to detect the rotation amount of the feed roll 16 and thus the movement amount of the material feed belt 11. The signal from the rotary encoder 21 is given to the control means 80 described later.

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

As shown in FIG. 2, inside the housing 70, 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 provided between them. It has been passed over. The drive roller 51 is driven by a motor (not shown), whereby the sanding belt 54 runs on the sanding surface of the workpiece in the direction of arrow B, which is the opposite direction of 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.

An air cushion type tread pad 55 is provided between the guide roll 52 and the sanding roll 53 which are arranged below the sanding mechanism 50. It is located on the back side of the sanding belt 54 and has a function of urging the sanding belt 54 downward (work 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 so as to be vertically movable, and are biased downward by springs (not shown).

A work detection roll 57 is provided on the work entry side of the sanding region (on the right side of the sanding roll 53 in FIG. 2). As shown in detail in FIG. 6, it is attached to a bracket 58 that is vertically movable, and a guide shaft 59 fixed to the bracket 58 penetrates through the support plate 60. A nut 59a is screwed to the guide shaft 59 to prevent the nut from coming off, and a coil spring 59b is provided between the support plate 60 and the bracket 58 so that the bracket 58, and thus the work detection roll 57, is constantly lowered. Being energized. A flange 59c is provided at the upper end of the guide shaft 59, and a work detection switch 61 that is operated by the vertical movement of the flange 59c is fixed to the support plate 60. Therefore, when the work is sent to the sanding area by the material feeding belt 11, the work detection roll 57 is lifted by the front end of the work and the switch 61 is turned on, for example, and when the work has finished passing, the work detection roll 57 is turned on. The switch 61 is turned off by being pushed down by the coil spring 59b. The signal from the work detection switch 61 is given to the control means 80 which will be described in detail later.

On the other hand, as shown in FIG. 4, a dust suction duct 62 extends vertically and is disposed on the work entry side of the sanding area, and the upper portion of the dust suction duct 62 is led out upward from the housing 70 so that the dust collection fan of the dust collecting fan is not shown. It is connected to the suction side. A guide duct 63 is connected to the lower end of the dust suction duct 62, and the tip of the guide duct 63 is inserted between the sanding roll 53 and the pressing roll 56 next to the sanding roll 53 to open toward the sanding roll 53 side in the front upper part thereof. ing. The guide duct 63 has a width dimension wider than the lateral width of the sanding belt 54 and opens in a thin slit shape.

An injection nozzle 64 is arranged on the work discharge side of the sanding area (that is, on the rear side of the guide roll 52). This has a tubular shape slightly longer than the lateral width of the sanding belt 54, and has a slit-shaped nozzle opening 64a on the work side, that is, on the lower side. As shown in FIG. It is connected to the compressor 66. As a result, when the solenoid valve 65 is opened, the pressurized air from the air conditioner press 66 side can be blown toward the sanding surface of the work at a substantially right angle.

A dust collecting hopper 67 (see FIG. 4) connected to the dust collecting fan is disposed on the left side of the drawing, which is the discharge side of the work, and a rotary brush is installed as shown in FIG. 68 and a rubber roll 69 are provided in that order. The rotating brush 68 has a function of being driven by a motor (not shown) to remove chips adhering to the surface of the work, and the rubber roll 69 has an adhesive surface and rotates in contact with the surface of the work. Therefore, it has a function of adhering and removing the chips of the work surface to the rubber roll 69 side. An inspection door 71 is attached to the housing 70 so as to be openable and closable.

Now, the above-mentioned control means 80 is configured to include the microcomputer 81, and as described above, receives the signals from the rotary encoder 21 and the work detection switch 61, and based on these signals. Control the solenoid valve 65. Specifically, when the microcomputer 81 receives a falling signal to turn off from the work detection switch 61 (detection of the rear end of the work), the reset state of the counter 82 is released and based on the pulse signal from the rotary encoder 21. Start the subtraction count. A value corresponding to the distance is set in advance in the counter 82 between the work detection switch 61 and the injection nozzle 64, and when the rear end of the work is moved to a position below the injection nozzle 64, The value of the counter 82 becomes zero. Then, when the value of the counter 82 becomes 0, the microcomputer 81 gives a trigger signal to the timer 83, and the timer 83 opens the solenoid valve 65 for several seconds.

The air compressor 66 has a pressure tank and is intermittently operated so as to constantly supply compressed air having a constant pressure. Further, the air compressor 66 is connected to the intake chamber 18 of the processing table 13. The dust fan is always running.

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).

Thereafter, the work transfer device 10 and related devices such as the dust collecting fan and the air compressor 66 are activated. Then, the feeding belt 11 is driven in the direction of arrow A in FIG. 2, and air is sucked from the inside of the intake chamber 18 of the processing table 13 by the dust collecting fan, and is fed through the ventilation hole 19 and the intake port 17. Air penetrates the material belt 11 and the processing table 13 from the upper side to the lower side. Further, compressed air is stored in the pressure tank of the air compressor 66, but at this point in time, the electromagnetic valve 65 is closed, so the compressed air is not discharged from the ejection nozzle 64.

Now, when the work to be ground is placed on the material feeding belt 11, this is fed downward of the sanding mechanism 50 as the material feeding belt 11 moves. When the front end of the work approaches the entrance of the sanding region, it comes into contact with the work detection roll 57 and pushes up the roll 57, so that the work detection switch 61 first turns on. Further, when the work is fed, the work surface is ground and ground in the sanding area.

When such a grinding process is performed, a large amount of chips are generated around the sanding region. In particular, since the sanding belt 54 runs to the right side in FIG. 1 in the sanding area, the chips are blown from right under the sanding roll 53 toward the right side, and most of them are opened at the upper right side of the sanding roll 53. The dust is effectively sucked into the guide duct 63 of the dust suction duct 62. However, since some of the chips stick to the rear end of the work, they may gradually accumulate in the shape of a canopy, as shown by the reference numeral D in FIG.

However, at the end of grinding, since the rear end of the work has passed below the work detection roll 57, the roll 57 moves downward and the work detection switch 61 is turned off. There is. Since this signal is given to the microcomputer 81 of the control means 80, the microcomputer 81 starts down-counting of the counter 82 in response to the pulse signal from the rotary encoder 21, and this down-counting starts the material feeding belt 11 and eventually the work. Is progressing according to the movement of. This down count is set to end when the rear end of the work reaches almost directly below the injection nozzle 64, and at the same time, a trigger signal is output to the timer 83, so that the solenoid valve 65 operates the timer 83. The signal opens it for only a few seconds. As a result, the compressed air from the air compressor 66 is expelled from the tip of the injection nozzle 64 toward the rear end of the work with a very strong force. As a result, the deposit D attached to the rear end portion of the work is separated from the work by the collision of the air flow, and is shattered and blown down. Then, most of the blown chips are sucked into the intake chamber 18 of the processing table 13 by being multiplied by the air flow flowing through the material feeding belt 11 and the processing table 13.

When the set time of the timer 83 elapses after the pressure air is discharged from the injection nozzle 64, the electromagnetic valve 65 is closed and the discharge of the pressure air is stopped. For this reason, the pressure in the pressure tank in the air compressor 66 is less likely to drop with a single discharge of pressure air, but the pressure in the pressure tank drops relatively significantly when such discharge of pressure air is repeated several times. Therefore, the air compressor 66 is finally operated to restore the pressure in the pressure tank.

Even if some chips remain on the surface of the work, they are removed by the rotating brush 68, and the adhesive rubber roll 69 rolls on the surface of the work to cut the chips. Since the powder adheres here, it can be completely removed from the surface of the work.

As described above, according to this embodiment, the pressure air is ejected to the rear end portion of the work piece from the jet nozzle 64 with a shocking force. Even if there is a situation in which a chip deposit is easily generated at the end, the chip deposit can be easily removed by blowing it off with an air flow.

Moreover, since the compressed air is discharged from the jet nozzle 64 only when the rear end of the work passes underneath, the consumption amount is much higher than that in the case where the compressed air is always discharged. Less. Therefore, since the air compressor 66 can be small and inexpensive, it has the excellent effect that the chips can be removed very efficiently as described above, but the manufacturing cost and the operating cost of the air compressor 66 are reduced. Both rises can be kept low. It should be noted that the dust collecting fan is continuously operated, but since this has a lower pressure than the air compressor 66, the continuous operation type does not become so large and expensive.

Further, in the above embodiment, the ventilation hole 19 and the intake port 17 are formed in the material feeding belt 11 and the processing table 13 to constantly generate the air flow that penetrates the material feeding belt 11 from top to bottom. And For this reason, not only is it effective in removing the chips scattered around during grinding of the work, but also the deposit D of chips blown off from the rear end of the work can be smoothly removed.

Second Embodiment FIG. 7 shows the main part. The difference from the first embodiment is that the compressed air from the air compressor is discharged from below the work. For this reason, a pressure air chamber 91 is formed on the downstream side of the sanding region of the processing table 13, a slit-shaped injection nozzle 92 is formed on the processing table 13, and a ventilation hole 19 is formed on the material feeding belt 11. is doing. Although not shown, the pressure air chamber 91 is connected to the air compressor through the same solenoid valve as in the first embodiment, and the rear end portion of the work has the same structure as in the first embodiment and the rear end portion of the work is the pressure air chamber. The electromagnetic valve is opened at the time when it passes above 91. Since other configurations are similar to those of the first embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

In this embodiment, since the electromagnetic valve is opened at the time when the rear end of the work passes above the pressure air chamber 91, the injection nozzle 92 penetrates the ventilation hole 19 of the material feeding belt 11. Pressured air is discharged upward. As a result, the deposit D of chips adhering to the rear end of the work is multiplied by this air flow to be peeled off and sucked into the dust collecting hopper 67 located above. Therefore, similar to the first embodiment, it is possible to easily remove the chips adhering to the work, and it is possible to use a small air compressor to reduce the cost.

Third Embodiment As shown in the main part of FIG. 8, in this embodiment, an upper injection nozzle 64 similar to that of the first embodiment is provided above the material feeding belt 11, and the processing table 13 is provided with a first injection nozzle 64. The feature is that a lower injection nozzle 92 similar to that of the second embodiment is provided. Although not shown, the upper and lower injection nozzles 64 and 92 are also connected to an air compressor via a solenoid valve, and the solenoid valve has the same structure as that of the first embodiment and the rear end portion of the work is the injection nozzle. It is designed to be opened when it passes near 64 and 92. The other structure is the same as that of the first embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof is omitted.

In the third embodiment, since the electromagnetic valve is opened at the time when the rear end of the work passes near the injection nozzles 64 and 92, the injection nozzles 64 and 92 are directed toward the rear end of the work. The compressed air is discharged with a strong force. As a result, the deposit D of chips adhering to the rear end of the work is peeled off by being carried by this air flow, and sucked by the dust collecting hopper 67 and the like.

Fourth Embodiment FIG. 9 shows the main part. The point that the injection nozzle 64 is provided above the material feeding belt 11 is the same as that of the first embodiment, but unlike the first embodiment, the material feeding belt 11 is non-perforated, and the processing table 13 is also provided. The intake port (17) as in the first embodiment is not provided. Therefore, an air flow vertically passing through the material feeding belt 11 and the processing table 13 is not generated, but at the time when the rear end of the work passes below the injection nozzle 64, the air flows from the injection nozzle 64 to the rear end of the work. The point that the compressed air is ejected toward the impact force is the same as in the first embodiment.

Even with such a configuration, the chips adhering to the work can be sufficiently removed depending on the application, and there is an advantage that the manufacturing cost can be reduced.

The present invention is not limited to the embodiments described above and shown in the drawings, and the following modifications are possible, for example.

(1) In each of the above-described embodiments, the work detection roll 57 is used to detect the work. However, the invention is not limited to this. For example, a photoelectric sensor is used to optically detect the work. You may do it.

Further, in each of the above-described embodiments, the counter 82 is down-counted according to the pulse from the rotary encoder 21 after the work detection switch 61 detects the work. This is because the work detection position (the position of the work detection roll 57) is relatively far from the injection nozzle 64, and the work detection position is set immediately before the injection nozzle. In this case, the configuration using the rotary encoder 21 and the counter 82 may be omitted, and the pressure air may be discharged from the injection nozzle immediately after the work is detected.

Further, even when the work detection position and the ejection nozzle are separated from each other as in the above-described embodiment, a timer may be provided instead of the counter 82 of the control means 80. A configuration in which the timer time is changed according to the moving speed of the belt is more preferable.

(2) In the above-described embodiment, the endless sanding belt 54 is run to perform polishing / polishing. However, the present invention is not limited to this. For example, a sanding mechanism in which grinding paper is wound around a sanding roll is used. It can also be applied to equipped sanding machines.

(3) The sanding member is not limited to being placed from the upper surface side of the work as in the above embodiment, but sanding may be performed by sandwiching both left and right sides of the work between the processing table and the sanding member. Of course, in this case, the injection nozzle is arranged so as to blow the pressurized air from the side of the work to the sanding surface.

(4) In the above-described embodiment, the rotary brush 68 and the rubber roll 69 are sequentially provided on the rear side of the injection nozzle 64, but these are not always necessary, and even if they are omitted, the intended purpose can be obtained. It is possible to achieve.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a wide belt sander according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway front view

FIG. 3 is a plan view of a processing table.

FIG. 4 is a vertical sectional view of a sanding mechanism.

FIG. 5 is a partial plan view of the material feeding belt.

FIG. 6 is a vertical sectional view of a work detection roll portion.

FIG. 7 is a vertical cross-sectional view showing a main part of a second embodiment of the present invention.

FIG. 8 is a vertical cross-sectional view showing a main part of a third embodiment of the present invention.

FIG. 9 is a vertical cross-sectional view showing a main part of a fourth embodiment of the present invention.

FIG. 10 is a partial vertical cross-sectional view for explaining a defect in a conventional wide belt sander.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Work transfer mechanism 11 ... Material feeding belt 13 ... Processing table 17 ... Intake port 19 ... Vent hole 50 ... Sanding mechanism 64 ... Injection nozzle 66 ... Air compressor 80 ... Control means

Claims (2)

[Scope of utility model registration request] 1. A sanding mechanism for polishing and grinding a work by running an endless sanding belt, a work transporting mechanism for transporting the work so as to pass through a sanding area by the sanding mechanism, and a work transporting mechanism. Work position detection means for detecting the position of the work, a compressor for generating pressure air, and an injection for ejecting pressure air from the compressor, which is provided at the work discharge side of the sanding region, toward the work A sanding machine comprising: a nozzle; and control means for controlling the discharge of pressurized air from the jet nozzle based on a signal from the work position detection means. 2. A sanding mechanism that runs an endless sanding belt to polish and grind a work, and a feed belt that is in contact with a processing belt so that the work belt can run, and the work is sanded by the sanding mechanism. A work transfer mechanism that transfers so as to pass through the area, a work position detection unit that detects the position of the work transferred by this work transfer mechanism, a compressor that generates compressed air, and a position on the work discharge side of the sanding area. An injection nozzle for ejecting pressure air from the compressor toward the work, a control means for controlling the ejection of the pressure air from the injection nozzle based on a signal from the work position detection means, and the processing An intake device formed at a position corresponding to the injection nozzle on the table and connected to the intake device. A sanding machine comprising air holes and a plurality of air holes formed so as to be scattered over substantially the entire area of the material feeding belt.