JP2562971B2 - Wide belt sander machine - Google Patents

Description

Description: [Industrial application] The present invention relates to a wide belt sander machine applied to the grinding and polishing of wood and the like.

[Prior Art] An endless sanding belt is hung on a belt driving mechanism provided in a sanding frame, a treading device is arranged on the side of a material feeding passage, and the treading surface is brought into contact with the inner surface of the belt. In a wide belt sander machine formed by cutting a grinding head against a material feeding device through a material feeding passage,
When the sanding belt is pressed against the processed material with a single treading pad over its entire width, at the edge of the processed material,
The belt is pressed so as to cover the edge, and the corner is dropped to cause edge sag. Particularly, when the processed material w has a warp and four corners are projected upward, the adverse effect is remarkable.

Therefore, a large number of pressing members are arranged in a row in the width direction of the material feeding passage, and each pressing member is driven individually by an air cylinder, and only the required pressing members are operated according to the width of the processed material. In this structure, the step pressure is applied to the upper surface of the processed material, and the step pressure on the side of the processed material is removed to prevent edge sagging of the processed material.
Various proposals have been made as disclosed in JP-A-48312 and JP-A-59-115154.

As further disclosed, as disclosed in JP-A-1-109165, two or more, which detect the passage of the front end and the rear end of the processed material within the width interval corresponding to each pressing member in front of the treading device. So that the processed material detector of
By discriminating between ON / OFF of adjacent multiple workpiece detectors, the air cylinder connected to the pressing member on the edge of the workpiece is connected to the low pressure air source and connected to the corresponding pressing member inside the processing. There has also been proposed a configuration in which an air cylinder that communicates with the reference air source is made to communicate with the reference air source so that the edge of the processed material is depressed with a weak force.

[Problems to be Solved by the Invention] As shown in FIG. 4, the processed material w has a convex surface x exceeding the reference thickness, a concave surface y less than the reference thickness, or a twisted surface on the surface thereof. In some cases, the wide belt sander machine may be provided with a work material having such a non-uniform thickness.

By the way, when the convex surface x is subjected to normal grinding and polishing, in the coated work w, the coating surface is peeled off together with the convex surface x, and good coating polishing cannot be performed. Further, if the concave surface y is subjected to normal grinding and polishing, the pedaling pressure may not act properly on the surface, and polishing residue may occur. Therefore, in grinding and polishing the processed material, it is desirable to apply it while applying a treading pressure corresponding to the height of the processed material.

The present invention is to meet such a requirement, and an object of the present invention is to provide a wide belt sander machine having a function of giving a stepping pressure corresponding to the thickness of a processed material at any time.

[Means for Solving Problems] In the present invention, an endless sanding belt is wound around a belt driving mechanism,
A treading device is arranged on the material feeding passage side, and the treading surface thereof is brought into contact with the inner surface of the belt--a plurality of grinding heads are provided opposite to the material feeding device via the material feeding passage, A large number of pressing members arranged in a row in the width direction of the material feeding passage and a large number of air cylinders that connect cylinder rods to the pressing members are provided, and the pressing members indirectly or directly step on the endless sanding belt. In the front of the treading device, the work material detector that detects the front end and the rear end passage of the work material is provided in a row in correspondence with each pressing member before and after the treading device. The device, the timing controller that drives each air cylinder separately in synchronization with the arrival of the workpiece due to the workpiece detection by the workpiece detector, and the non-contact distance that generates the height information of the workpiece. Each pressing the detection sensor A material thickness detection device that detects the thickness in the width direction of the processed material that is arranged in front and back for each member, and a control valve that is interposed between the inside of the air cylinder and the pressure air source. A controller for opening and closing a control valve based on a distance information signal from the distance detection sensor, and controlling the opening and closing of the valve by the controller adjusts the amount of supply of pressurized air into the air cylinder, A wide-belt sander machine, which is equipped with an air-electric converter that changes the pressure in the air cylinder steplessly so that the higher the pressure becomes, the more the pressure decreases.

[Operation] When the processed material w travels in the feeding path, the height of the surface of the processed material w (the thickness of the processed material) is sequentially read by the non-contact type distance detection sensor and is synchronized with the arrival at the treading device. Then, the pressure is supplied to the air cylinder of the pressing member by stepless adjustment by the air-electric converter so as to suit the thickness of the processed material. For this reason, while the processed material is given the optimum pedal pressure for the surface condition (the thickness of the processed material) by the pressing member,
Grinding and polishing will be performed by the sanding belt.

Here, in the present invention, since the non-contact type distance sensor is used, even if there is unevenness with a drop on the surface of the processed material, it is possible to adapt to this relatively easily, and it corresponds to the surface. It is possible to generate accurate distance information.

[Embodiment] Implementation of the present invention in which a large number of pressing members arranged in the width direction of the material feeding passage and a large number of pressurizing devices such as lock cylinders for operating the pressing members are provided. Examples will be described with reference to the accompanying drawings.

FIG. 1 is a wide-belt sander machine of a top-grinding type equipped with a single grinding head, in which a running belt 4 is suspended between running rolls 2 and 3 at the bottom of a main body frame 1. A device 5 is provided, and the upper surface thereof serves as the material feeding passage 6. The drive traveling roll 2 is rotated by a drive motor M, and as shown in FIG.
A slit plate f having a groove formed on the peripheral surface thereof is supported on the output shaft of, and a sensor k for detecting passage of the groove is attached to the slit plate f.

A sanding frame 7 is provided on the main body frame 1 at a position above the running material device 5, and a grinding head is mounted on the frame 1. That is, a steering roller 8 is provided at the upper end of the sanding frame 7, and a large-diameter drive roll 9 and a driven roll 10 are provided at the lower end of the sanding frame 7 to form a drive mechanism. Sanding belt 11 is hung around. Further, a treading device 12 is arranged on the sanding frame 7 between the rolls 9 and 10.

2 and 3 show the structure of the pedaling device 12. Reference numeral 13 denotes an attachment frame fixed to the sanding frame 7 and arranged between the rolls 9 and 10.
A treading frame 14 is hung on this. The tread frame 14
A large number of tread pressure bars 15 are held so as to be able to move up and down in the width direction, and a spring 17 attached to a sliding groove 16 around the tread bars 15 biases the tread pressure bars 15 upward.

Further, a pressing member 18 is fixed to the lower end of each treading bar 15, and an elastic body 19 made of sponge or the like is arranged so as to cover a large number of the pressing members 18 from the lower surface.
The bottom surface of 14 is covered with a wear resistant cloth 20 fixed to both sides.

The upper end of the tread bar 15 is connected to the piston rod of the air cylinder 22 fixed to the mounting frame 13, and the compressed air is introduced into the air cylinder 22 to move the piston 21.
Is lowered in the air cylinder 22 against the rib 17 so that the lower surface of the pressing member 18 is pressed against the inside of the elastic body 19.

An air bag that is long in the width direction may be interposed between each pressing member 18 and the elastic body 19. The air bag and the elastic body 19 are
One may be provided for each pressing member 18. After all, the pressing member 18 is understood as having a function of stepping the endless sanding belt 11 indirectly or directly, and various treading members may be interposed between the endless sanding belt 11 and the pressing member 18.

In the air cylinder 22, the amount of the pressurized air from the pressurized air source P is adjusted by the air-electric converter V, and the internal pressure thereof is controlled steplessly.

An example of this air-electric converter V will be described with reference to FIG.

When the input signal supplied to the controller 30 is amplified and a voltage is applied to the flapper 31 composed of a piezoelectric element, the flapper 31 bends in the direction of closing the nozzle 32. As a result, the pressure in the nozzle back pressure chamber 33 rises and acts on the diaphragm 34 to push down the exhaust valve 35. This causes the control valve 36, which is linked to the exhaust valve 35, to move downward and open the intake port 37. Then, a part of the supply pressure is converted into an electric signal via the pressure sensor 38 and fed back to the controller 30. Therefore, the correction operation works until the pressure becomes suitable for the input signal, and the output air pressure proportional to the input signal can always be obtained. That is, the pressure in the air cylinder 33 can be changed steplessly by controlling the input signal to the air-electric converter V.

A pressure roll 25, which is pressed toward the running material device 5 side by an ammunition, is provided above the sanding frame 7 at the upper part of the material feeding passage 6.
Is provided, and a non-contact type distance detection sensor S for generating height information of the processed material is provided adjacent to the pressing roll 25 so as to correspond to each pressing member in the front and back. The sensor S row constitutes a material thickness detection device that detects the thickness of the processed material in the width direction.

The detection sensor S can be configured by a non-contact type distance sensor that uses a variety of electromagnetic waves such as laser, light, and ultrasonic waves that detect the distance from the processed material w. That is, the electromagnetic wave radiated from the wave transmitter is captured by a wave receiver adjacent to the wave transmitter (or also used as the wave transmitter), and the time from the wave transmission to the wave reception is detected to detect the detection. A configuration that generates a voltage or current output (distance information) corresponding to the distance from the sensor S to the surface of the workpiece w can be adopted.

Unlike the contact type sensor using a roll or the like, the non-contact type distance sensor S can relatively easily adapt to the unevenness having a drop on the surface of the processed material,
It is possible to generate accurate distance information corresponding to the surface.

Based on the distance information from the detection sensor S,
The air-electric converter V is driven, the required pressure air is supplied into the air cylinder 22, and the pressing member 18 operates,
A pedaling pressure suitable for the surface state of the processed material (thickness of the processed material) is applied to the surface of the processed material w from the pedaling device 24.

 The pressure supply control device will be described with reference to FIG.

The central control unit CPU is connected to the detection sensor S, the sensor k, and the same number of ascending counters C ₂ of descending counters C ₁ corresponding to the respective pressing members 18, and the input-information indicates the empty-electricity. The converter V is controlled. The descending counter C ₁ and the ascending counter C ₂ are preset with coefficient values corresponding to the distances to the detection sensor S and the tread portion. The timing control device of the present invention is constituted by the counters C ₁ and C ₂ .

Further, a threshold value capable of determining the presence or absence of the processed material w is preset in the central control unit CPU, and when the distance information from the distance detection sensor S is less than or equal to this threshold value (the surface of the processed material w is higher than the threshold value). It is determined that the processed material w exists. Then, the counting of the descending counter C ₁ is started in accordance with the determination that the processed material is present. Further, when the processed material w passes from the lower part of the distance detection sensor S and the distance information from the distance detection sensor S exceeds this threshold value, it is determined that the processed material has passed the rear end and the ascending counter C ₂ starts counting.

In this configuration, the distance detection sensor S is also used as a processing material detector, and thus the distance detection sensor S row constitutes a processing material detection device and a material thickness detection device.

On the other hand, as the processing material detector, for example, a configuration may be adopted in which the presence or absence of the processing material is determined by turning on / off the proximity switch by the detection roll 26 contacting the surface of the processing material.

Furthermore, the central control unit CPU reduces the distance value from the distance detection sensor S in advance (increases the surface height of the workpiece)
A linear function is set so that the pressure on the air cylinder 22 is reduced in accordance with the above. The value calculated by this linear function is output to the air-electric converter V side via the D / A converter. I am trying. The calculated value waits until the counter C ₁ once stored in the thickness data storage unit RAM is used up.

 The pressure supply operation will be described.

When the processed material w is supplied onto the running material device 5, its front end is detected by the processed material detector (also used as the distance detection sensor), and the surface state is read by the distance detection sensor S. Since this distance information is an analog signal (current signal or voltage signal), it is converted into a digital value by the A / D converter and input to the central control unit CPU.
Then, the data for setting the optimum pressure in the air cylinder 22 is sequentially calculated based on the distance value input by the linear function set in the central control unit CPU, and the calculated data is sequentially stored in the thickness data storage unit RAM. Is stored.

The data stored in the thickness data storage unit RAM is time-sequentially called based on the clock pulse in synchronization with the counting of the descending counter C ₁ , and is converted into an analog signal by the D / A converter, and the empty signal is stored. Input to the controller 30 of the electric converter V. This allows the air cylinder 22
Is supplied with an appropriate amount of pressurized air corresponding to the state of the surface of the processed material w, and the pressing member 18 descends to apply an optimum stepping pressure to the surface of the processed material. Therefore, the surface of the processed material w is satisfactorily ground and polished.

[Advantages of the Invention] As described above, the present invention applies the pressure in the air cylinders that connect the cylinder rods to a large number of pressing members that are arranged in a row in the width direction of the material feeding passage. Based on the accurate distance information from the distance sensor, the step-to-step change is made by the air-electric converter, so even if there is unevenness on the surface of the processed material, the processed material will be stepped on with the optimum pressure. As a result, it is possible to perform grinding / polishing properly copying the surface.

Thus, even if the processed material has irregularities or twists, excessive polishing or unpolished residue is corrected as much as possible, and the excellent effect that the processed material w can be finely ground and polished is obtained. is there.

[Brief description of drawings]

FIG. 1 is a schematic front view of a wide belt sander machine, FIG. 2 is a vertical sectional front view of a treading device 12, and FIG. 3 is a vertical side view of the same.
FIG. 4 is a block diagram of the pressure supply control device, and FIG.
It is a vertical side view which shows an example of the electrical converter V. 11 …… Sanding belt 12 …… Treading device 18 …… Pressing member 22 …… Air cylinder 30 …… Controller 36 …… Control valve S …… Distance detection sensor CPU …… Central control unit C ₁ , C ₂ …… Counter V ...... Pneumatic-electrical converter P ...... Pressure air source w ...... Processed material

Claims (1)

(57) [Claims] 1. One to a plurality of grinding heads, wherein an endless sanding belt is stretched around a belt drive mechanism, a treading device is arranged on the side of a material feeding passage, and the treading surface is brought into contact with the inner surface of the belt. A large number of pressing members, which are opposed to the material feeding device via the material feeding passages and are arranged in a row in the width direction of the material feeding passage, and a large number of air cylinders that connect the cylinder rods to the respective pressing members. And a pressing member for pressing the endless sanding belt indirectly or directly by the pressing member, and a work material detector for detecting passage of the front end and the rear end of the work material in front of the treading device. Machining material detection device that is arranged in multiple rows corresponding to the front and back of the member, and timing control device that drives each air cylinder separately in synchronization with the arrival of the machining material due to the machining material detection by the machining material detector When, A material thickness detecting device configured to detect a thickness in a width direction of a processed material, which is configured by disposing a non-contact type distance detection sensor that generates height information of the processed material so as to correspond to each pressing member in front and back. A control valve provided between the inside of the air cylinder and a pressure air source, and a controller for controlling the opening and closing of the control valve based on a distance information signal from the distance detection sensor, the valve opening and closing control by the controller The air-electric converter that adjusts the amount of pressurized air supplied to the air cylinder, and changes the pressure in the air cylinder steplessly so that the pressure decreases as the surface of the work material increases. Wide belt sander machine, which is equipped with.