JPH0811357B2 - Wide belt sander machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wide belt sander machine applied to the grinding and polishing of wood and the like.

<Prior Art> One to a plurality of endless sanding belts are hung on a belt driving mechanism provided on 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. A wide belt sander machine comprising a grinding head of (1) and a material feeding device which are opposed to each other through a material feeding passage,
When the processing material w is pressed against the sanding belt b with the single treading pad p over the entire width thereof, as shown in FIG. 11, the edge e of the processing material w covers the edge e. The belt b is pressed and the corners are dropped to cause edge droop. Particularly, when the processed material w has a warp and four corners are projected upward, the adverse effect is remarkable.

Therefore, as disclosed in Japanese Utility Model Publication No. 46-25496, an elastic plate is arranged on the lower surface of the treading device, and a small area is provided at the end of the elastic plate located on the edge e of the processed material w. It has been proposed to provide a pressure portion so as to relieve the pressure on the edge e. However, in such a configuration, it is necessary to change the width of the elastic plate according to the width of the processed material w, and it is not possible to quickly cope with grinding of various processed materials w having different sizes.

On the other hand, there is provided a treading device in which a plurality of pressing members respectively connected to the rods of the air cylinder are arranged in a row in the width direction, and only the required pressing members are operated according to the width of the workpiece w. Various types of those in which the pedaling pressure is exerted on the upper surface of the processed material w have been proposed as disclosed in JP-B-51-48312 and JP-A-59-115154.

However, these things can only switch the air cylinder to drive and non-drive, and the width of the processed material w
It is rather rare that the boundaries of the pressing members exactly coincide with each other. Therefore, the tread surface is pressed against the end edge e of the processed material w so as to cover the edge e, which causes excess pressure. Therefore, the above problems remain unsolved.

An object of the present invention is to provide a wide belt sander machine capable of improving excessive grinding of the edge e of the processed material w.

<Means for Solving Problems> In the present invention, an endless sanding belt is hung on 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. In a wide-belt sander machine in which one to a plurality of grinding heads are provided opposite to a material feeding device via a material feeding passage, a plurality of grinding heads arranged in a row in the width direction of the material feeding passage are provided on the pedaling device. A pressing member and a large number of air cylinders linking a cylinder rod to each pressing member are provided, and two workpiece material detectors are arranged in front of the treading device within a width interval corresponding to each pressing member. A plurality of processing material detectors are arranged in a row, and a pressure converter for selectively communicating the air to the air cylinder with a low pressure air source and a high pressure air source is provided. One workpiece detector S1 , S
2 and the adjacent processing material detector S2 ′ on one side and the adjacent processing material detector S1 ″ on the other side are determined to be ON / OFF, and when the processing material detectors S1 and S2 are OFF Shuts off the flow of pressurized air into the air cylinder linked to the pressing member, and when all of the workpiece detectors S2 ′, S1, S2, S1 ″ are on, the high-pressure air source is supplied. In this case, a control means for switching the pressure converting device is provided so as to connect the air cylinder to the low pressure air source.

<Operation> When the processed material w travels in the material feeding passage, the width of the processed material w is detected by the processed material detector prior to the stepping pressure by the pressing member.

In such a structure, the pressing member for stepping on the inner part of the processed material is a processed material detector adjacent to both sides of the corresponding processed material detector S1, S2 prior to the arrival of the relevant portion of the processed material. Since both S2 ′ and S1 ″ are turned on (working material detection), the air cylinder associated with the pressing member communicates with the high pressure air source, and presses the working material with a relatively strong force.

Furthermore, when both of the processed material detectors S1 and S2 are off, the inflow of pressurized air into the air cylinder is blocked, and the pressing member maintains the non-depressing state. In this case, the non-depressing state is set even when any of the adjacent processing material detectors S2 ′ and S1 ″ is turned on.

In addition, in the present invention, in other cases, the air cylinder linked to the pressing member communicates with the low pressure air source, and presses the processed material with a relatively weak force.

That is, the pressing member that steps on the edge e of the processed material w is
Only one of the workpiece detectors S1 and S2 is turned on and the other is turned off. In this case, the air cylinder that links the pressing member communicates with the low pressure air source, and presses the processed material with a relatively weak force. Therefore, the pressure of the end edge e on the processed material w becomes optimum, and grinding of a predetermined thickness can be performed without causing edge drooping.

Further, even if both of the processed material detectors S1 and S2 are on, if either of the adjacent processed material detector S2 ′ and processed material detector S1 ″ is off, the air linked with the pressing member The cylinder is in communication with the low pressure air source.

Therefore, the edge e of the processed material w is the processed material detector S1 (S2).
Is located between the workpiece material detector S2 '(S1) adjacent to
When one of the processed material detector S2 'and the processed material detector S1 "is turned off, the pressing member comes into pressure contact with the processed material w with a low pressure, and such a normal positional relationship is possible. Even in the case of occurrence of the edge, the edge edge e is stepped on with a weak force, so that the edge sag is effectively prevented.

Thus, the pressing mode of the pressing member is optimally selected in consideration of the states of the adjacent processing material detectors, and it is possible to prevent edge drift in accordance with the actual processing.

<Embodiment> An embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an upper surface grinding type wide belt sander equipped with a single grinding head, in which a running material belt 4 is provided between a driving traveling roll 2 and a driven traveling roll 3 at a lower portion of a main body frame 1. A running material device 5 is provided so as to be suspended, and an upper surface of the running material device 5 serves as a material feeding passage 6. The drive traveling roll 2 is rotated by a drive motor M, and as shown in FIG. 6, the output shaft of the drive motor M is supported by a slit plate f having a groove on its peripheral surface, and the slit plate f is supported by the slit plate f. A sensor k for detecting passage of the groove is attached to the 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 thereof to form a drive mechanism. Sanding belt
11 has been passed over. Further, a treading device 12 is arranged on the sanding frame 7 between the rolls 9 and 10.

 The second and third parts show the structure of the pedaling device 12.

Here, 13 is a mounting frame fixed to the sanding frame 7 and arranged between the rolls 9 and 10, and a treading frame 14 is suspended from the mounting frame 13. A large number of tread pressure bars 15 are held on the tread pressure frame 14 so as to be able to move up and down, and a spring 17 attached to a sliding groove 16 around the tread bar 15 urges 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 end of 14 is covered with a wear resistant cloth 20 fixed on both sides.

The upper end of the tread bar 15 is linked to the piston rod of the air cylinder 22 fixed to the mounting frame 13, and when the compressed air is introduced into the air cylinder 22, the piston 21 is released.
Is lowered in the air cylinder 22 against the rib 17 so that the lower surface of the pressing member 18 is brought into pressure contact with the inner surface of the elastic body 19.

The air cylinder 22, as shown in FIGS. 6 and 7,
A low pressure air source P1 and a high pressure air source P2 that are connected via solenoid valves V1 and V2 (pressure conversion device) to block the inflow of pressure air into the air cylinder 22 and communicate with the outside air side. The state is controlled so that the air cylinder 22 communicates with the low pressure air source P1 in a low pedaling state and the air cylinder 22 communicates with the high pressure air source P2 in a high pedaling state.

In addition, the material feeding passage 6 before and after the sanding frame 7
A pressing roll 25, which is pressed against the running material device 5 side by an ammunition machine, is provided on the upper part, and a detection roller 26 in a number twice that of the pressing member 18 is provided adjacent to the pressing roll 25. As shown in the drawing, the unit distance W between the adjacent pair of detection rolls 26a and 26b is arranged so as to match the width of the pressing member 18.

Here, since the pressing member 18 is controlled by the air cylinder 22, it is easy to set the stepping pressure to a predetermined pressure, and in order to obtain the predetermined pressure, each pressing member is
Fine tread pressure control can be performed without the 18 becoming enlarged. Further, the pressing member 18 group is made of an elastic body 19 made of sponge or the like.
Since it is covered from below by means of the lower surface, discontinuous grinding marks are not generated on the surface of the processed material due to the pressure change between the pressing members 18.

The detection roll 26, as shown in FIGS.
It is pivotally supported by a link 27 that swings around. The link 27 is elastically contacted at the lower end of a push rod 31 in the tubular body 29 by a spring 30 mounted in the tubular body 29, and is urged to rotate counterclockwise. Further, a detection bolt 32 is screwed onto the upper end of the link 27 so that its tip is located near the detection end of the proximity switch SW on the tubular body 29, the workpiece w is supplied, and the tip thereof is the detection roll. When 26 is lifted upward against the spring 30, the link 27 rotates clockwise around the support shaft 28 and the detection bolt
The tip of 32 is separated from the detection end of the proximity switch SW, thereby causing the ON operation (processing material detection). The distance between the tip of the detection bolt 32 and the proximity switch SW can be adjusted by the screwing operation of the adjusting screw 33 that abuts the outer surface of the tubular body 29.

Thus, the processing roll detector S, the proximity switch SW, and the like constitute a processed material detector S.

Next, in such a configuration, the solenoid valves V1 and V2 described above are
The operation control means of the (pressure converter) will be described with reference to FIGS.

The central control unit CPU is connected to a proximity switch SW which is an output source of the processed material detector S, a sensor k, and the same number of descending counters C1 and ascending counters C2 corresponding to each pressing member 18. , Depending on the input information, the solenoid valve
V1 and V2 switching control is performed.

Explaining an example of the switching control means, the processed material w is supplied onto the material feeding passage 6 to run, and the detection roll is detected.
When it comes to the position of 26, the detection roll 26 rises, the proximity switch SW detects the separation of the detection bolt 32, and the processed material detector S
Causes the on-operation of.

By the way, as shown in FIG. 8, the processing material detectors S1 and S2 corresponding to the detection rolls 26a and 26b correspond to each other within the unit interval W of the pressing member 18 as one set, and the one set of processing is performed. Material detectors S1 and S2 and the adjacent processed material detector S on one side
Turning on 2'and its adjacent workpiece material detector S1 "
Based on the off state, the central control unit CPU causes the pressing member 18
Determine the control contents of solenoid valves V1 and V2 corresponding to.

That is, as shown in FIG. 9, processed material detectors S1, S2
When is off, it is judged as “0”, the pressure air to the air cylinder linked to the pressing member is blocked from flowing, and the workpiece detectors S2 ′, S1, S2, S1 ″ are all on. In order to connect the air cylinder to the high pressure air source by judging "H", and in other cases, judge the "L" to communicate the air cylinder with the low pressure air source, the counter corresponding to the pressing member 18 concerned. C1 is driven to count the number of pulse waves from the sensor k.
Switch to 2 or both.

Further, the counter C2 is driven at the same time when the judgment is changed to "0", and the solenoid valves V1 and V2 are switched as the count is exhausted.

The count values of the counters C1 and C2 are predetermined in correspondence with the traveling distance from the processed material detector S to the position of the pressing member 18.

More specifically, when the judgment is “0”, as shown in FIG. 7A, the air cylinder 22 is disconnected from the air sources P1 and P2, communicated with the outside air side, and the pressing member 18 is retracted upward by the spring 17. Position.

Next, when the "L" determination is made, as shown in FIG. 7B, only the solenoid valve V2 is switched to communicate the inside of the air cylinder 22 with the low pressure air source P1, the pressing member 18 is lowered at a low pressure, and the elastic body 19 is moved. The sanding belt 11 is brought into contact with the processed material w via the via at a low pressure.

Further, when the "H" judgment is made, as shown in FIG. 7C, the solenoid valves V1 and V2 are switched to communicate the inside of the air cylinder 22 with the high pressure air source P2, and the pressing member 18 is driven to the tread pressure side, and the sanding belt 11 is brought into contact with the processed material w with high pressure.

 Next, the control means will be described.

When the width of the detection roll 26 is much smaller than half the width of the pressing member 18, as shown by the slant line α in FIG. 8, the edge e of the processed material w is adjacent to the detection roll 26b ′. And the detection roll 26a, and the unit interval W of the pressing member 18 '
When located inward, the pressing member 18 'should be crimped at low pressure to prevent its drooling. However, if this is judged as "H" by the ON operation of both of the processed material detectors S1 and S2, the pressing member 18 'is pressed at a high pressure, and the conventional defect is carried over. Further, it is desirable that the pressing member 18 'is pressed at a low pressure even when there is the opening h in the middle of the processed material w and the adjacent detection roll 26a "is not detected.

Therefore, the adjacent detection roll 26b ′ and detection roll 26b
The pressing mode of the pressing member 18 'is selected in consideration of the state of "a".

That is, as shown in FIG. 9, when both of the processed material detectors S1 and S2 are off, it is determined that there is no processed material w, and a "0" determination is made, and the processed material detectors S1 and S2 and the detection roll 26b '.
When both of the processing material detector S2 'corresponding to No. 1 and the processing material detector S2 "corresponding to the detection roll 26a" are on, the "H" determination is made, and in other cases, the "L" determination is made. .

As a result, even if both of the processed material detectors S1 and S2 are on, if any of the adjacent processed material detectors S2 ′ and S1 ″ is off, an “L” determination is made. As a result, when the end edge e of the processed material w is below the pressing member 18 ', the pressing member 18' comes into pressure contact with the processed material w at a low pressure, and the end sag can be prevented. .

In the embodiment, the counter C1 and C2 of the same number as the number of the pressing members 18 can be eliminated, and a single counter can be used regardless of the number of the pressing members 18, and in this case, the count value It is stored in a data register connected to the central control unit CPU together with the ON / OFF data of each of the processed material detectors S1 and S2, and the count value corresponds to the position from the position of the processed material detector S to the pressing member 18. When the count number is added and the count value is reached, the pressing member 18 may be driven according to "0", "L", and "H" determined from the data.

FIG. 10 shows a wide belt sander equipped with a plurality of grinding heads 40a, 40b, 40c. Even with such a configuration, the above-described configurations can be similarly applied.

That is, a rough finishing grinding head 40 is formed by arranging a steering roller 8, a driving roll 9 and a driven roll 10 on the running material device 5 in a triangular shape, and by sandwiching a sanding belt 11 on the roll group.
a, a finishing grinding head 40b and a super-finishing grinding head 40c are sequentially arranged on the upper part of the running material device 5, and each head is equipped with a large number of pressing members 18, and the grinding head
In the front part of 40a, the same group of processed material detectors S as described above is arranged in the width direction.

In such a configuration, each pressing member 18 of the grinding heads 40a to 40c is driven according to the determination result by the processing material detector S. At this time, since the driving timings of the respective pressing members 18 are different, the grinding head 40b similarly detects the processed material as the count value corresponding to the distance l1 from the processing member detector S of the pressing member 18 of the grinding head 40a is consumed. Timing control is performed so that the grinding head 40c is driven together with the count value corresponding to the distance l2 from the child S and the count value corresponding to the distance l3 from the workpiece detector S as well.

Note that the distance to the grinding head 40b or the grinding head 40c is long, and the work material w may slip during grinding by the grinding head placed in front of the grinding head 40. Therefore, when the pressing member 18 of the grinding heads 40b and 40c is driven with reference to the time of picking up by the work material detector S located at the entrance of the grinding head 40a, proper timing control cannot be performed and edge drift is prevented. That is, the object of the present invention cannot be achieved.

Therefore, between the grinding heads 40a and 40b and between the grinding heads 40b and 40c.
A detector 40c for detecting the passage of the front end of the processed material is provided between them. If the detector 40s is a photoelectric detection switch in which a light emitting portion and a light receiving portion are provided on both sides of the material feeding passage, it is possible to detect the arrival of the tip even if the processed material is deformed.

If the counter is operated from the detection and the determination results are sequentially executed as the count is exhausted, the pressing pressure by the pressing member 18 can be applied at the optimum timing.

<Effects of the Invention> As described above, the present invention enables the pressing member 18 to be operated in two modes of high pressure and low pressure, and a plurality of processed material detectors S1, corresponding to the pressing member 18. S2 on
By turning off, it is determined whether the edge e of the processed material w is in the width position of the pressing member 18, and even if both the processed material detectors S1 and S2 corresponding to the pressing member are in the ON state, When either of the adjoining workpiece detectors S2 ', S1 "is off, the pressure is applied at a low pressure. Therefore, the optimum pressing member is pressed in accordance with the positional relationship of the pressing member 18 at the edge e. Since the mode is selected, there is an excellent effect that the edge sag can be effectively prevented in accordance with the actual processing.

[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 partially cutaway front view of the detection roll 26 and the like, FIG. 5 is a side view of the same, FIG. 6 is a block diagram of the control device, and FIGS. 7A to 7C show the operation of the control valves V1 and V2. FIG. 8 is a plan view showing the positional relationship between the processed material w, the detection roll 26 and the pressing member 18, and FIG. 9 is a logical operation table of the control means. Further, FIG. 10 shows an embodiment in which the present invention is applied to a wide belt sander machine provided with a large number of grinding heads. FIG. 11 is a vertical cross-sectional side view of the tread pad p showing the drawback of the conventional example. 11; Sanding belt, 12; Treading device, 17; Spring, 18; Pressing member, 19; Elastic body, 22; Air cylinder, 26, 26a, 26
b; detection roll, 27; link, 40a, 40b, 40c; grinding head,
S, S1, S2; Detector, CPU; Central control unit, C1, C2; Counter, V1, V2; Control valve, P1; Low pressure air source, P2; High pressure air source, w;
Processed material, e; Edge

Claims (1)

[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. In a wide-belt sander machine formed opposite to a material feeding device via a material feeding passage, in the treading device, a large number of pressing members arranged in a row in the width direction of the material feeding passage, and a cylinder for each pressing member. Provided with a large number of air cylinders that link rods, in front of the pedaling device, a large number of processed material detectors are arranged so that two processed material detectors are arranged within the width interval corresponding to each pressing member. It is provided with a pressure conversion device that is arranged in a row and selectively communicates air to the air cylinder with a low-pressure air source and a high-pressure air source, and further, two processed material detectors S1, S2 within the width interval of the pressing member.
And the adjacent workpiece material detector S2 'on one side and the adjacent workpiece material detector S1 "on the other side are turned on and off, and when the workpiece detectors S1 and S2 are off, Shuts off the flow of pressurized air into the air cylinder linked to the pressing member, and is a high-pressure air source when all of the workpiece detectors S2 ′, S1, S2, S1 ″ are on, and otherwise. A wide belt sander machine, characterized in that it is provided with control means for switching the pressure converting device so as to connect the air cylinder to a low pressure air source.