JPH0796186B2 - 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> An endless sanding belt is 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 in contact with the inner surface of the belt. In a wide-belt sander machine in which a grinding head is attached to a material feeding device through a material feeding passage, when a processed material w is pressure-contacted with a sanding belt b by a single tread pad p. As shown in FIG. 13, at the end edge e of the processed material w, the belt b is pressed so as to cover the end edge e, and the corners are dropped to cause edge sag. In particular, if the processed material w has a warp and the four corners are projected upward,
The harmful 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 processed material w of the elastic plate w
By providing a small area gentle pressure portion at the end portion located on the edge e of
It has been proposed 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 in front of the treading device, a large number of processed materials corresponding to the respective pressing members. A wide belt including detectors arranged in the width direction, and a pressure conversion device for individually controlling the pressure of each pressing member to each air cylinder based on the width direction column data from the processed material detector group. Thunder machines have been proposed.

However, in these cases, it is necessary to keep the width direction row data sent from each detector group at a predetermined time interval along with the traveling of the processed material in the register until the pressing member is operated. However, there is a drawback in that a large storage capacity for storing a large number of columns of data is required.

An object of the present invention is to provide a wide belt sander machine provided with a control means capable of reducing the amount of storage to be stored.

<Means for Solving Problems> In the present invention, the width direction row data from the processed material detector group and the width direction row data stored immediately before correspond to "0" and "1" respectively. The values are compared by exclusive logic circuits (Ex-OR circuit or Ex-NOR circuit), and if even one input value is different, the width direction column data is stored in the register together with the count data, and the count data is stored. When the count target value calculated from is digested, the pressure member is provided with a pressure control means that drives the pressing member in a predetermined manner based on the data.

<Operation> The exclusive logic circuit (Ex-OR circuit or Ex-NOR circuit) outputs a logical value that can distinguish the case where two input "0" and "1" values are different from the case where they are equal. It is known. For example, the exclusive OR circuit (Ex-OR circuit) outputs a "1" value when one has a "0" value and the other has a "1" value.

Therefore, the width direction column data from the processed material detector group, the width direction column data stored immediately before, and the respective values corresponding in the width direction of the width direction column data stored immediately before are set to the exclusive logic circuit respectively. By comparing with, the change in the shape in the width direction of the processed material can be read, and is stored as data only in the register when the change in shape occurs. Then, since the stored data is stored together with the count value when the data is picked up, when executing the data, the count data corresponds to the distance from the detector to the pressing member. When the count target value obtained by adding up the count values of the counter is digested, and the pressing member is operated based on the data, at an appropriate timing,
It becomes possible to grind and polish the processed material.

It is not necessary to match the number of the pressing members with the number of the detectors. For example, for one pressing member, two detectors are arranged within the same width, and the on / off state is set to "0". ],
By processing the data as a "1" value, it is possible to prevent edge sagging of the processed material. That is, the width direction row data may be subjected to a determination process via a required control unit to control the driving of the predetermined pressing member.

<Embodiment> An embodiment of the present invention 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 an upper surface of the device 5 serves as a material feeding device 6.
Further, the drive traveling roll 2 is rotated by a drive motor M, and as shown in FIG. 6, an output shaft of the drive motor M is supported by a slit plate f having a groove on its peripheral surface. The slit plate f is equipped with a sensor k for detecting the passage of the groove.

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.

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 in the tread pressure frame 14 so as to be capable of moving up and down, and a spring 17 attached to a sliding groove 16 around the tread frames 15 urges the tread pressure bars 15 upward. .

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

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 introduction of pressurized air into the air cylinder 22 causes the piston 21 to resist the spring 17 in the air cylinder 22. The lower surface of the pressing member 18 is brought into pressure contact with the inner surface of the elastic body 19 by descending.

As shown in FIGS. 6 and 7, the air cylinder 22 is connected to a low pressure air source P ₁ and a high pressure air source P ₂ via solenoid valves V ₁ and V ₂ (pressure conversion device), and A non-pedal pressure state in which the flow of pressurized air into the cylinder 22 is blocked to communicate with the outside air side, a low pedaling state in which the air cylinder 22 communicates with the low pressure air source P ₁ , and an air cylinder 22 is coupled to the high pressure air source P ₂ . It is designed to control conversion to a high pedaling state in which it communicates.

A pressure roll 25 is pressed on the running material device 5 side by an ammunition machine at the upper part of the material feeding passage 6 before and after the sanding frame 7.
Is provided adjacent to the pressing roll 25, the pressing member
The number of the detection rolls 26, which is twice as many as 18, is the unit interval W between the adjacent two detection rolls 26a and 26b as shown in FIG.
Are arranged so as to match the width of the pressing member 18.

As shown in FIGS. 4 and 5, the detection roll 26 is pivotally supported by a link 27 that swings around a support shaft 28. The link
The lower end of a push rod 31 in the tubular body 29 is elastically contacted by a spring 30 mounted in the tubular body 29, and 27 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 32
Of the proximity switch SW is separated from the detection end of the proximity switch SW, thereby causing an 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 adjustment screw 33 that abuts the tip of the outer surface of the tubular body 29.

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

Next, the operation control means of the solenoid valves V ₁ and V ₂ (pressure conversion device) having the above configuration will be described with reference to FIGS. 6 to 8.

The central control unit CPU includes a proximity switch SW which is an output source of the processed material detector S, a sensor k, a counter C which sequentially counts pulses from the sensor k, and an exclusive logic circuit (Ex-OR circuit). ) Is connected to a register R, and switching control of the solenoid valves V1 and V2 is performed according to the input information.

The data processing in this central control unit CPU will be described with reference to the flowchart of FIG.

As in the step of FIG. 7, the width direction column data D is input from the proximity switch SW at each count from the counter C. Here, at the right position in the figure, four (or several dozen actually) processed material detectors are provided corresponding to the shape of the processed material w, and the width direction data D is four "0", "1". "
It is exemplified as consisting of values.

By the way, if the processed material comes to a position directly below the pressing member 18 and the pressing member 18 generates a predetermined drive even if the processed material does not change its shape, a large memory is stored. Requires capacity. So, the step Ex
-Data processing is performed by the OR circuit. That is, in the step, the width direction column data D and the respective corresponding values “0” and “1” in the width direction of the latest width direction column data D ₀ stored in the register R immediately before are set to the exclusive logic circuit respectively. is inputted to the (E _x -OR circuit), it is compared. At this time, if even one "0" or "1" value is different and a "1" output is generated, the entire width direction column data D becomes valid, and the data D
Is newly set as the width direction column data D ₀ (step), the data is stored in the register of the address B of the register R (step), and 1 is added to the value of the address B (step). . Together with the data D, and the count value c _d from the counter C when read by the proximity switch SW, the count value obtained by adding the coefficient value c _o of the counter C corresponding to the distance to reach the pressing member 18 from the detector S target value
is calculated as c _t, it is stored.

The subroutine consisting of this flowchart is executed every time a pulse is sent from the sensor k (every time the count of the counter C is counted). Eventually, only when there is a change in the data, the next register in the register is sequentially processed. the address, so that the data is stored together with the count target value c _t.

Then, by the generation of the pulse signals from the sensor K, 1 is added to the count value c _d counter C, the count value
c _d reaches a count target value c _t stored in the register R, the drive control of the pressing member 18 is made.

In addition to the conventional means for arranging the pressing member 18 and the detector S in a one-to-one correspondence, this drive control is performed within the width of the pressing member 18 in order to prevent the edge deviation of the processed material w as described above. A set of two detection rolls 26a, 26b is provided in each of the rolls, and the pressing member 18 is switched between a high pressure and a low pressure or a non-pressing state according to the width direction row data D stored in the register R corresponding to each roll.

An example of the switching control means will be described. The processed material w is supplied onto the material feeding passage 6 to run, and the detection roll 26
When it comes to the position, the detection roll 26 rises, the proximity switch SW detects the separation of the detection bolt 32, and the work material detector S is turned on.

By the way, the processing material detector S corresponding to the detection rolls 26a and 26b.
_As shown in FIG. 9, ₁ and S ₂ are the pressing members 18 as one set.
Corresponding to the unit interval W of, the data from a pair of adjacent work material detectors S ₁ and S ₂ among the data stored in the register R is determined, and the output content is determined by the central control unit CPU. To do. That is, as shown in FIG. 10, when both are “0”, “0” is determined, when either is “1”, “L” is determined, and both are “1”. In this case, "H" is determined. Then, such a "L" determination or "H" determination, in synchronization with the digestion of the the count target value c _t, switches the both or either solenoid valves V _1, V _2.

More specifically, when the judgment is “0”, as shown in FIG. 8A, the air cylinder 22 is cut off from the communication with the air sources P ₁ and P _2, and is communicated with the outside air side, and the pressing member 18 is pushed by the spring 17. Set to the upper retracted position.

Next, when the "L" judgment is made, as shown in Fig. 8B, the solenoid valve
Low pressure air source inside the air cylinder 22 by switching only V _2.
It communicates with P ₁ , the pressing member 18 is lowered at a low pressure, and the sanding belt 11 is brought into contact with the work material w via the elastic body 19 at a low pressure.

Furthermore, when the "H" judgment is made, the solenoid valve is
By switching V ₁ and V ₂ , the high pressure air source P
₂ , the pressing member 18 is driven to the tread side, and the sanding belt 11 is brought into contact with the processed material w at a high pressure.

That is, according to this control mode, the processed material detectors S ₁ , S ₂
When either one of them is turned on (“1”), it can be considered that the end edge e of the processed material w is located within the unit interval W of the pressing member 18, so that the solenoid valve V By switching between ₁ and V ₂ , the low pressure air source P ₁ is communicated with, and the pressing member 18 is pressed against the workpiece w via the sanding belt 11 at low pressure. For this reason, the sanding belt 11 is pressed against the edge e at a relatively low pressure, and excessive grinding of the edge e does not occur.

If both of the workpiece detectors S ₁ and S ₂ are on,
Since it means that the processed material w travels over the entire unit interval W of the corresponding pressing member 18, the air cylinder 22 is connected to the high pressure air source P ₂ by switching the solenoid valves V ₁ and V _2. The pressing member 18 is pressed against the processed material w via the sanding belt 11 at high pressure. Therefore, the required grinding amount can be achieved.

In this switched state, when the data D given a count target value c _t currently corresponding count value c _d in the register R is not, the state is maintained. That is, in the state determined by the above-described Ex-OR circuit, where there is no change in the processed material and new data D is not stored, the current pedaling state or non-pedaling state is maintained. Become.

Next, other 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. 9, 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, in the above-mentioned means, the "H" is judged by the ON operation of both of the processed material detectors S ₁ and S ₂ , and the pressing member 18 ′ is brought into pressure contact with the high pressure, and the conventional drawbacks are carried over. become. Further, there is an opening h in the middle of the processed material w,
Even when the adjacent detection rolls 26a ″ are not detected, it is desirable that the pressing member 18 ′ is brought into pressure contact at a low pressure.

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

Therefore, as shown in FIG. 11, when both of the processed material detectors S ₁ and S ₂ are off, it is determined that there is no processed material w and “0” is determined, and the processed material detectors S ₁ and S ₂ are detected. If both of the processed material detector S ₂ ′ corresponding to the roll 26b ′ and the processed material detector S ₁ ″ corresponding to the detection roll 26a ″ are ON, it is determined as “H”, and otherwise, “ L ”.

As a result, even if both the processed material detectors S ₁ and S ₂ are on, the adjacent processed material detector S ₂ ′ and the processed material detector S ₂ ′ are
When any one of S ₁ ″ is off, the “L” determination is performed, and when the edge e of the processed material w is below the pressing member 18 ′, the pressing member 18 ′ is a low pressure processed material. It comes into pressure contact with w, and it is possible to prevent the end sagging.

Even with such a configuration, if there is no change in the processed material and no new data is stored, the above-described determination state is maintained.

FIG. 12 is a wide belt sander machine provided with a plurality of grinding heads 40a, 40b, 40c, and even in such a configuration,
The configurations described above can be similarly applied.

That is, a rough finishing grinding head 40a, in which steering rollers 8, drive rolls 9 and driven rolls 10 are arranged in a triangle on the running material device 5 and a sanding belt 11 is wound around the rolls,
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 provided with a large number of pressing members 18, and the grinding head 40
In the front part of a, 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 pressing members 18 are different, the pressing member 18 of the grinding head 40a has a count value corresponding to the distance from the processing material detector S, and the grinding head 40b has the same processing material detector. Grinding head 40 along with counting and digesting the count value corresponding to the distance from S
Timing control is performed so that c is also driven when the count value corresponding to the distance from the processed material detector S is consumed.

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, a detector 40s is provided between the grinding heads 40a and 40b and between the grinding heads 40b and 40c to detect that the front end of the processed material has passed. 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.

Then, from this detection, the counter is operated, and the determination results described above are sequentially executed as the count is exhausted, so that the depression pressure by the pressing member 18 can be applied at the optimum timing.

<Effects of the Invention> The present invention compares the width-direction column data from the processed material detector group with the width-direction column data stored immediately before by an exclusive logic circuit, and shapes across the width direction. Since the data is stored only when there is a change, unlike the case where the same data is sequentially stored in the register, the storage amount of the register can be reduced, and various data can be stored accordingly. In addition, there are excellent effects such as good control of grinding.

[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.
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 a control device, FIG. 7 is a flow chart showing data processing control, and FIG. ~ C is an explanatory view showing the operation of the control valves V ₁ and V ₂ , Fig. 9 is a plan view showing the positional relationship between the work material w, the detection roll 26 and the pressing member 18,
FIG. 10 is a logical operation table of the control means of the same example, and FIG. 11 is a logical operation table of the control means of the second example. Further, FIG. 12 shows an embodiment in which the present invention is applied to a wide belt sander machine provided with a large number of grinding heads. Furthermore, FIG. 13 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 pressing member, 18; Pressing member, 19: Elastic body, 22; Air cylinder, 26, 26a, 26b; Detection roll, 27; Link, 40a, 40b, 40c;
Grinding head, S, S ₁ , S ₂ ; Detector, CPU; Central control unit, C, Counter, V ₁ , V ₂ ; Control valve, P ₁ ; Low pressure air source, P ₂ ; High pressure air source, w; Machining Material, e; edge, R; register

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. A large number of pressing members, which are opposed to the material feeding device via the material feeding passage, are arranged in a row in the width direction of the material feeding passage, and a large number of air connecting cylinder rods to the respective pressing members. A cylinder is provided, and in front of the treading device, a large number of processed material detectors corresponding to each pressing member are arranged in a row in the width direction, and each pressing member is based on the width direction row data from the processed material detector group. In a wide-belt sander machine that controls the pressure to the air cylinders that are connected with each, in the width direction row data from the processed material detector group and the width direction row data stored immediately before Each corresponding "0 ,
The value of "1" is set to the exclusive logic circuit (Ex-OR circuit or Ex-
If even one input value is different by comparing with the NOR circuit), the width direction column data is stored in the register together with the count data, and when the count target value calculated from the count data is consumed, it is pressed based on the data. A wide belt sander machine comprising a pressure control means for driving a member in a predetermined manner.