JPH0699343A - Wide belt sander machine - Google Patents

Abstract

PURPOSE:To effectively use a width directional row data, in a machine of providing a function, in which grinding and polishing corresponding to a condition in a width direction of a workpiece can be applied, on the other hand reciprocating a belt grinder in the width direction, based on the width directional row data from a group of workpiece detecting piece by individually press stepping each pressing member controlled. CONSTITUTION:A machine is provided with a central control unit CPU in which based on a sensor 51 for detecting a predetermined turn position of any turning shaft in a drive system of a crank mechanism, a moving distance from the original position of a belt grinder 12 is indexed, to transfer a corresponding relation of each pressing member 23 to each workpiece detecting piece S in an opposite direction by a quantity of the pressing member 23 equivalent to the moving distance, and the corresponding relation is updated one after another so that each workpiece detecting piece S corresponds to each pressing member 23 almost just before and after position, thus to control each solenoid valve V1, V2, connected to each pressing member 23, based on the corresponding relation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wide belt sander machine for grinding and polishing wood surfaces.

[0002]

2. Description of the Related Art An endless sanding belt is hung on a belt guide mechanism including front and rear guide rollers supported on a material feeding passage side, and a belt grinding device is provided in which a treading pad is arranged inside the endless sanding belt. A belt sander machine disposed facing a material apparatus is known.

[0003]

An endless sanding belt is wound around 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 one to a plurality of belt grinding devices opposed to a material feeding device through a material feeding passage, in which a processed material is sanded with a single tread pad over its entire width. When the sheet is pressed, the belt is pressed against the edge of the processed material so as to cover the edge, the corner is dropped, and edge sag occurs. Therefore, it is necessary to loosen the pedaling pressure of the pedaling pad at this edge. However, if this pressure control is performed uniformly in the width direction of the tread pad, the effectiveness is lost in a processed material having a different width, an irregular peripheral shape, or a frame material.

Therefore, 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 a large number of pressing members are provided in front of the treading device. The processing material detectors of are arranged in a row in the width direction, and based on the width direction row data from the processing material detector group, each pressure member is provided with a pressure conversion device for performing pressure control to each air cylinder. Wide belt sander machine was proposed.

On the other hand, in the conventional structure, as shown in FIG. 12, when the tension state of the endless sanding belt c between the guide rollers a and b is seen, the endless sanding belt c is wide and the guide roller a , B, the distance between the lower edges is long, so that the tensile force is unevenly distributed in the width direction, and waviness x occurs in the width direction. For this reason, the surface of the processed material is not uniformly pressed, and vertical streaky polishing unevenness occurs. This unevenness is conspicuously shown in the case of final finishing polishing such as coating polishing and causes deterioration of the finishing quality. As a means for solving this problem, a belt grinding device in which an endless sanding belt is hung on a belt guide mechanism including front and rear guide rollers, and a treading pad is arranged inside the endless sanding belt, A belt sander machine that is supported by a guide member in the left-right direction and is capable of continuously reciprocating the belt grinding device by a left-right reciprocating device in a direction intersecting the material feeding direction with respect to the material feeding device. It was proposed in Kaihei 2-83159.

By the way, when the belt grinding device moves in this way, a displacement corresponding to the movement occurs in the relationship between the processed material detector and the pressing member, and the pressing member group capable of controlling the pedaling devices separately and independently. The meaning of constructing is diminished.
It is an object of the present invention to provide a wide belt sander machine having a configuration capable of adjusting the correspondence between the processed material detector and the pressing member even when the pedaling device moves in the width direction.

[0007]

According to 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. ~ A plurality of belt grinding devices are provided in opposition to the material feeding device via the material feeding passage, and a large number of pressing members arranged in a row in the width direction of the material feeding passage in the stepping device, and each pressing member. A large number of air cylinders for connecting cylinder rods are provided in front of the treading device, and a large number of processed material detectors corresponding to each pressing member are arranged in a row in the width direction. In a wide belt sander machine equipped with a pressure conversion device configured to perform pressure control to each air cylinder connected to each pressing member based on the row data, a crankshaft is rotated by a reciprocating drive motor. Rukura A reciprocating driving device for continuously reciprocating the belt grinding device in the width direction with respect to the material feeding device via a locking mechanism, a width position detecting means of the belt grinding device, and a belt grinding device based on the width position detecting means. The moving distance from the original position is calculated, and the correspondence relationship between each pressing member and each processing material detector is moved in the opposite direction by the number of pressing members corresponding to the moving distance, and each processing material detector is The present invention is characterized by further comprising a central control device that sequentially updates the correspondence relationship so as to correspond to the pressing members substantially immediately before and after, and controls the pressure conversion device based on the correspondence relationship. In this case, the width position detecting means may be composed of a sensor that detects a predetermined rotation position of any rotation shaft of the drive system of the crank mechanism.

[0008]

The reciprocating drive motor is driven to rotate the crankshaft, and the belt grinding device continuously reciprocates in the width direction with respect to the material feeding device. As a result, the endless sanding belt is pressed against the processed material while performing a zigzag motion relatively by the combination of the lateral movement of the processed material and the traveling of the processed material.
Grinding and polishing will be performed. Therefore, the processed material is given a grinding direction component orthogonal to the material feeding direction, and even when the sanding belt undulations x occur between the guide rollers, the work material is flattened by the grinding direction component to remove polishing unevenness. Therefore, it is possible to achieve a good polished surface.

By the way, when the belt grinding device moves in this way, a displacement of the movement occurs in the relationship between the work material detector and the pressing member. Therefore, the movement amount of the belt grinding device (each pressing member) is detected by the width position detecting means, and the movement amount is made to substantially correspond to the movement amount, and the correspondence relationship between the processed material detector group and each pressing member is reversed. As a result, even if the belt grinding device moves, the processed material detectors and the pressing members always have a relationship in which they correspond to each other immediately before and after. That is, the information from the detector is related only to the air cylinder that operates the pressing member at the immediately preceding position. Then, after delaying the distance between the processed material detector and the pressing member, the air cylinder is driven at a predetermined pressure based on the presence or absence of the processed material or the thickness information by the detector. Become.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a top-grinding wide belt sander machine equipped with a single belt grinding device, and its configuration will be described. A body frame 10 is supported on the base 1. Elevating screws 2 and 2 which rotate in conjunction with each other by an elevating motor are inserted through the supporting portions on both sides of the base 1 and the main body frame 10 so that the main body frame 10 can be raised and lowered with respect to the base 1. Further, on the base 1, a material feeding device 4 is supported by the frames 3 and 3 between the lifting screws 2 and 2. In this material feeding device 4, a material feeding belt 7 is stretched over front and rear guide rollers 5 and 5, one of which serves as a driving roller driven by a driving motor M, and the upper surface thereof serves as a material feeding passage. A slit plate f having a groove formed on the peripheral surface is fixed to the output shaft of the drive motor M, and a sensor k for detecting passage of the groove is attached to the slit plate f (see FIG. 6). ). As will be described later, the sensor-k controls the drive timing of the treading device P.

A sanding frame 11 is supported on the main body frame 10 so as to correspond to the material feeding device 4 in the vertical direction and is movable in the width direction. A belt grinding device 12 is supported on the sanding frame 11. This belt grinding device 12 has a drive guide roller 14 on the supply side of the sanding frame 11 and a guide roller 1 on the discharge side.
5 are pivotally supported, and a pedaling device P is arranged between the guide rollers 14 and 15. Further, on the upper part of the sanding frame 11, a steering cylinder 13 is swingably supported by a support cylinder 17, and an endless sanding belt 16 is wound around a belt guide mechanism including guide rollers 14 and 15 and the steering roll 13. .

Next, the structure of the pedaling device P will be described with reference to FIGS. Here, reference numeral 18 denotes a mounting frame fixed to the sanding frame 11 and arranged between the rolls 14 and 15, and a treading frame 19 is suspended from the mounting frame 18. A large number of tread pressure bars 20 are held on the tread pressure frame 19 so as to be able to move up and down in the width direction.
A spring 22 attached to a sliding groove 21 around the spring 22 biases the tread bar 20 upward.

Further, a pressing member 23 is fixed to the lower end of each treading bar 20, and an elastic body 24 made of sponge is arranged so as to cover a large number of the pressing members 23 from the lower surface. Wear-resistant cloth 2 fixed on both lower surfaces of
It is covered with 5.

The upper end of the tread bar 20 is connected to a piston rod of an air cylinder 27 fixed to the mounting frame 18. By introducing pressurized air into the air cylinder 27, the piston 21 is formed into a spring 22 in the air cylinder 27. The lower surface of the pressing member 23 is brought into pressure contact with the inner surface of the elastic body 24. As shown in FIG. 6, the air cylinder 27 includes a low pressure air source P1.
And a high-pressure air source P2 via solenoid valves V1 and V2 (pressure conversion device), and a non-depressing state in which the inside of the air cylinder 27 communicates with the outside air side and a low-depressing state in which a low pressure air source communicates. The cylinder 27 is controlled to be converted into a high pedaling pressure state in which it communicates with a high pressure air source.

As shown in FIGS. 4 and 5, the detection roll 30 is pivotally supported by a link 32 that swings around a support shaft 31. The link 32 is urged to rotate counterclockwise by elastically contacting the lower end of a push rod 35 in the tubular body 33 by a spring 34 mounted in the tubular body 33. Also, link 3
A detection bolt 36 is screwed onto the upper end of 2 such that the tip of the detection bolt is located near the detection end of the proximity switch SW on the cylindrical body 33, the processing material w is supplied, and the detection roll 30 is stretched 34.
When the link 32 is floated upward against the contact angle, the link 32 pivots clockwise around the support shaft 31, and the tip of the detection bolt 36 separates from the detection end of the proximity switch SW, thereby turning on (processing material detection). ) Is caused. The distance between the tip of the detection bolt 36 and the proximity switch SW can be adjusted by the screwing operation of the adjusting screw 37 that abuts the outer surface of the cylindrical body 33. Thus, the processing material detector S is constituted by the detection roll 30 and the proximity switch SW.

On the other hand, the detection roll 30 and the pressing member 23 are made to correspond to the front and rear in a one-to-one relationship with the pressing member 23 in a fixed position of the belt grinding device 12 as described later, or As shown in FIG. 8, twice as many detection rolls 30 as the pressing members 23 are provided, and the detection rolls 30 and 30 in pairs are arranged so that the unit interval thereof matches the width of the pressing member 23. Various correspondence relationships can be generated. Then, in each case, the detection roll 30 row generates the width direction row data D, and the pressing members 23 are brought into the non-depressing state and the depressing state as described above, corresponding to the width direction state of the processed material. Convert. Alternatively, in the case where the pressure control is further developed, it is converted into a non-pedal pressure state, a low pedal pressure state, and a high pedal pressure state.

Next, the operation control means of the solenoid valves V1 and V2 (pressure conversion device) having the above construction will be described with reference to FIGS. The central control unit CPU has a proximity switch SW serving as an output source of the processing material detector S, a sensor k attached to the slit plate f of the drive motor M, and a counter for sequentially counting the pulses from the sensor k. C, the exclusive OR circuit (Ex-OR circuit), and the register R are connected, and the solenoid valves V1 and V2 are connected according to the input information.
Switching control of the (pressure conversion device) is performed.

Data processing in the central processing unit CPU will be described with reference to the flow chart of FIG. As in the step of FIG. 7, the width direction column data D is input from the proximity switch SW for each count from the counter C. Here, at the right position in the figure, four (in practice, several dozen) processed material detectors S are provided in correspondence with the shape of the processed material w, and the width direction data D is calculated from four 0, 1 values. It is exemplified as follows.

By the way, if the processed material does not change its shape, the processed material comes to a position directly below the pressing member 23 and is sequentially stored until the pressing member 23 performs a predetermined drive. , Requires a large storage capacity. Therefore,
Data processing is performed by the Ex-OR circuit of the step.
That is, in the step, the width direction column data D and the corresponding 0, 1 values in the width direction of the latest width direction column data D0 stored in the register R immediately before are respectively exclusive OR circuits (Ex-OR). Circuit) and compared.

At this time, even if only one unit has different 0, 1 values,
When 1 output is generated, the entire width direction column data D becomes valid, and this data D is newly added to the width direction column data D0.
(Step), the data is stored in the register at the address B of the register R (step), and 1 is added to the value at the address B (step).
Along with the data D, the count target value ct obtained by adding the count value cd from the counter C when read by the proximity switch SW to the count value c0 of the counter C corresponding to the distance from the detector S to the pressing member 23. Is calculated and stored as.

The subroutine consisting of this flow chart 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 the data changes, the inside of the register is sequentially The data will be stored in the next address together with the count target value ct. When the pulse signal is generated from the sensor k, 1 is added to the count value cd of the counter C, and when the count value cd reaches the count target value ct stored in the register R, the drive control of the pressing member 23 is performed. Is done. Therefore, from the detector S to the pressing member 2
Timing control corresponding to the distance to 3 is performed.

This drive control is performed by pressing member 23 and detector S.
In addition to the means for arranging one by one, as described above, a pair of detection rolls 30a, 30b are arranged within the width of the pressing member 23 in order to prevent the edge deflection of the processed material w. The pressing member 23 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. When the work material w is supplied onto the material feeding passage 6 to travel and reaches the position of the detection roll 30, the detection roll 30 moves up and the proximity switch SW. Detects the separation of the detection bolt 32, and the work material detector S is turned on.

By the way, as shown in FIG. 8, the processed material detectors S1 and S2 corresponding to the detection rolls 30a and 30b correspond to each other within the unit interval W of the pressing member 23 as a set, and to the register R. Of the stored data, the data from a pair of adjacent work material detectors S1 and S2 is discriminated, and the output contents are discriminated by the central control unit CPU. That is, if both are 0, it is judged as “0”, and if either is 1, it is judged as “L”.
In the case of, "H" is determined. The count target value ct described above is determined by the "L" or "H" determination.
The solenoid valves V1 and V2, or both, are switched in synchronism with the digestion of.

More specifically, when the judgment is "0",
The air cylinder 22 is cut off from the communication with the air sources P1 and P2, communicated with the outside air side, and the pressing member 23 is moved to the upper retracted position by the spring 17.

Next, at the time of "L" determination, only the solenoid valve V1 is switched to move the inside of the air cylinder 22 to the low pressure air source P1.
The pressing member 23 is lowered at a low pressure, and the sanding belt 11 is brought into contact with the processed material w at a low pressure via the elastic body 19.

Further, when the "H" judgment is made, the solenoid valves V1 and V2 are
Is switched to communicate the inside of the air cylinder 22 with the high-pressure air source P2, and the pressing member 23 is driven to the tread pressure side, so that the sanding belt 11 is brought into contact with the processed material w at a high pressure.

That is, according to this control mode, when one of the processed material detectors S1 and S2 is turned on (1), the edge e of the processed material w is within the unit interval W of the pressing member 23. Therefore, by switching the solenoid valves V1 and V2, the low pressure air source P1 is communicated, and the pressing member 23 is pressed at low pressure onto the workpiece w via the sanding belt 11. 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.

Further, when both the work material detectors S1 and S2 are turned on, it means that the work material w is traveling over the entire unit interval W of the corresponding pressing member 23. Air cylinder 2 by switching between V1 and V2
2 is connected to the high-pressure air source P2, and the pressing member 23 is pressed against the workpiece w via the sanding belt 11 at high pressure. Therefore, the required grinding amount can be achieved.

Incidentally, this switched state is maintained when there is no data D given the count target value ct corresponding to the current count value cd in the register R. That is, in the state determined by the above Ex-OR circuit, where there is no change in the processed material and the new data D is not stored, the current pedaling state or non-pedaling state is maintained. Become.

Thus, in the case where the processed materials having different widths, the outer peripheral shape not uniform, or the frame body having the hole portion in the central portion are ground and polished, the width from the processed material detector S group is used. By applying pressure control to each air cylinder 27 connected to each pressing member 23 on the basis of the direction row data, an optimum stepping pressure is applied to the edge of the processed material to prevent edge drift, which is good. Grinding and polishing will be performed.

On the other hand, as shown in FIG.
The reciprocating drive motor 41 serving as the reciprocating drive source of the belt grinding device 12 is provided on the lower surface of the gantry 40 attached to the outer side surface of
Mounts the sprocket 42 fixed on its drive shaft,
Similarly, a chain is connected to a sprocket 43 fixed to the upper surface of the gantry 40. The crank pin 44 is attached to the rotating plate 48 that is provided concentrically with the sprocket 43.
And a second end of a crank 45 pivotally supported at one end of the sanding frame 11 is connected to the crank pin 44 to form a crank mechanism 46. The reciprocating drive motor 41 drives the crank 45 to reciprocate with a stroke twice as large as the eccentric amount of the crank pin 44. As a result, the sanding frame 11 is moved in the left-right direction by the action of the guide rails 9, 9. It is guided to and moves back and forth. Since the belt grinding device 12 is assembled to the sanding frame 11 and integrated, the belt grinding device 12 is continuously reciprocated right and left by the reciprocating drive motor 41. Thus, an example of the left-right reciprocating device of the sanding frame 11 is configured by such a configuration.

The operation of the reciprocating mechanism will be described. The endless sanding belt 16 includes guide rollers 14,
Since the distance between the lower edges of 15 is long, the tensile force is unevenly distributed in the width direction, and the wavy x is generated in the width direction as shown in FIG.
However, the belt grinding device 12 together with the sanding frame 11 is driven by the crank mechanism 46, guided by the guide rails 9, 9, and continuously reciprocates in the left-right direction orthogonal to the material feeding direction. Along with this, the endless sanding belt 16 is pressed against the work material while performing a relative zigzag movement by the combination of the lateral movement of the work material and the traveling of the work material to perform grinding and polishing. For this reason, the processed material is rubbed against the abrasive grain surface in the width direction by the grinding direction component in the left-right direction, and is leveled to a flat surface to prevent uneven polishing, and a good polished surface can be achieved.

The reciprocating drive motor 41 is connected to a reciprocating operation control switch 50, which is a push button switch for controlling the drive thereof, via a sensor 51 and a timer 52 which will be described later. When it is desired to reciprocate the belt grinding device 12 in the width direction as described above, the reciprocating operation control switch 50 is turned on, and when the processed material is an irregular shape or a frame material, each pressing member is pressed. When it is desired to control 23 separately, this is turned off.

As a result, the belt sander of this embodiment can selectively execute the two types of grinding / polishing modes by the on / off operation of the reciprocating operation control switch 50.

The sensor 51 has a function of determining the original position of the sanding frame 11 (belt grinding device 12) and a function of determining the current position of the sanding frame 11 which will be described later. That is, the crank mechanism 4
The rotating plate 4 fixed to the shaft of the sprocket 43 of the drive system 6
As shown in FIGS. 9 and 10, a slit plate 54 is fixedly attached to the back surface of 8, and a plurality of slits 55 are provided at predetermined intervals on the peripheral portion thereof.
(Four in the figure) are formed. Then, the slit plate 54
A sensor 51 for reading the slit 55 is provided on the peripheral portion of the. Therefore, one rotation of the slit plate 54 causes the belt grinding device 12 to make one reciprocation in the width direction, so that the reference position and the current position of the belt grinding device 12 can be specified by the position of the slit 55. The rotary plate provided with the slit 55 is fixed to any rotary shaft of the drive system of the crank mechanism 46, such as the drive shaft of the reciprocating drive motor 41, separately from the one to which the crank pin 44 is fixed. Can be done.

On the other hand, the sanding frame 11 is loaded with various members and has a large load. Therefore, inertia acts on the sanding frame 11, and the movement of the reciprocating drive motor 41 does not stop at the same time as the driving of the reciprocating drive motor 41 stops. Therefore, the slit 55 is detected by the sensor 51 before the belt grinding device 12 comes to a fixed position, the timer 52 is driven based on the detection, and the reciprocating drive motor 41 is synchronized with the time exhaustion of the timer 52. Drive is stopped. By this, the inertial movement stroke of the belt grinding device 12 is observed in advance, and the reciprocating drive motor 41 is stopped at a timing earlier than the fixed position of the belt grinding device 12 by the stroke, whereby the belt grinding device 12 is stopped. The device 12 can always be positioned at a fixed position (original position) when the reciprocating operation control switch 50 is turned off.
Alternatively, if the sensor 51 can be moved relative to the slit plate 54 in the circumferential direction, this constitutes a timing control means.

As described above, the belt sander machine according to the present embodiment controls the pressing members 23 individually so that the pressure of the processed material w can be increased based on the width direction row data D from the processed material detector S group. It is equipped with a function that can perform optimum grinding and polishing corresponding to the state in the width direction. On the other hand, it also has a function of reciprocating the belt grinding device 12 in the width direction to prevent the waviness x of the endless sanding belt 16.

Next, the essential part of the present invention will be described. As described above, by driving the reciprocating drive motor 41,
The belt grinding device 12 reciprocates left and right in the width direction. By the way, each pressing member 23 is driven in cooperation with the detection roll 30 (working material detector S) provided with the proximity switch SW arranged in the front part thereof, and a predetermined treading operation is generated. Therefore, even if the reciprocating drive motor 41 is moving in the width direction, if the specific pressing member 23 is always associated with the specific processed material detector S, the amount of movement of the specific pressing member 23 is increased. As a result, the correspondence between the front and the rear is deviated, and rather the stepping pressure control of the pressing member 23 is deviated, which deteriorates the grinding and polishing quality of the processed material.

Therefore, in the present invention, based on the width position detecting means of the belt grinding device 12 and the width position detecting means,
The moving distance from the original position of the belt grinding device 12 is calculated, and the correspondence relationship between each pressing member 23 and each processed material detector S is shifted in the opposite direction by the number of pressing members 23 corresponding to the moving distance. , A central control unit CPU that sequentially updates the corresponding relationship so that each processed material detector S and each pressing member 23 correspond to each other at a position immediately before and after, and controls the solenoid valves V1 and V2 based on the corresponding relationship. Is equipped with.

Here, this almost immediately rear position is the pressing position adjacent to the detection roll 30 when the unit interval between the above-mentioned pair of detection rolls 30 and 30 matches the width of the pressing member 23. When the pressure control of the pressing member is performed in consideration of the states of the members 30 and 30 (see Japanese Patent Application Laid-Open No. 1-246063), it is also meant to include a substantially immediate relationship.

Here, the width position detecting means is composed of a slit 55 shown in FIG. 10 and a sensor 51 for counting the number of passages of the slit 55. The current position indexing by the width position detecting means will be described.

By the cooperation of the sensor 51 and the slit 55, the moving position (current position) of each pressing member 23 from the original position is determined. This positional relationship is obtained by the following well-known equation in the swing slider crank mechanism. x≈r (1-cos θ + 1/2 λ sin ² θ) where x is the sanding frame 11 from the inner fulcrum
Displacement, r is the drive shaft and the crank pin 44 of the crank 45.
The distance between them, λ, is r / L (L is the length of the crank 45).

If the pad width (distance between the pressing members 23) is W, it is possible to understand how many pressing members 23 have moved in units of the pad width W by x / W. Here, if the pad width W is 30 mm, if x = 150 mm, it means that five pads have been moved. Then, in response to such movement, the correspondence relationship between the detection roll 30 group and each pressing member 23 is shifted in the opposite direction by five, whereby the detection roll 3
The 0 group and each pressing member 23 are made to correspond to each other immediately before and after. At this time, as described above, the sensor k attached to the slit plate f of the drive motor M, and the sensor k
The control of each pressing member 23 is delayed by an amount corresponding to the moving distance of the processed material between the detection rolls 30 group and each pressing member 23 by the counter C that sequentially counts the pulses from.

As can be seen from the above equation, when the displacement x is to be obtained, it is calculated from the values of r and L.
In the end, with the pad width W as a reference, an integer value is taken and the correspondence is reversed. Therefore, empirically, it is possible to use only a sine wave and write as x≈A / 2W · sin (θ−180 °) (2). Where A = (number of moving pads + 1) × W

That is, assuming that the belt grinding device 12 moves by four pressing members 23 and the pad width W is 30 mm, x≈5 × 30/2 × 30 · sin (θ−180 °) ≈2.5 sin (θ−180 °).

Therefore, the relationship with the rotation angle θ of the crank pin 44 of the crank 45 is as follows. Rotation angle θ Displacement x (calculated value) Measured value Number of retrogrades 0 (°) 0 0.174 0 45 -1.76 -1.115 -1 90 -2.5 -2.5 -2 135 -1.76 -1.115 -1 180 0 0.174 0 225 1.76 1.379 1 270 2.5 2.5 2 315 1.76 1.379 1 360 0 0.174 0

From this result, the equivalent number (reverse number) in which the pressing member 23 is moved in the opposite direction with respect to the moving direction of the belt grinding device 12 is the same both in the calculated value and the actual measured value, and the above-mentioned schematic. It turns out that the formula is valid.

Further, the belt grinding device 12 is used for each pressing member 2
If the pad width W is set to 30 mm, assuming that the number of movements is two, then x≈3 × 30/2 × 30 · sin (θ−180 °) ≈1.5 sin (θ−180 °).

Therefore, the relationship with the rotation angle of the crank pin 44 of the crank 45 is as follows. Rotation angle θ Displacement x (calculated value) Measured value Reverse number 0 (°) 0 0.104 0 90 -1.5 -1.5 -1 180 0 0.104 0 270 1.5 1.5 1 360 0 0.104 0

Therefore, if the above-mentioned equation (2) is inputted in advance to the central control unit CPU of FIG. 6, the information of the processed material detector S is applied to the pressing member 2 corresponding to the detection roll 30.
3 is reversely transferred by the number of retrograde movements to update the correspondence relationship, and in synchronization with the transfer of the workpiece w directly below the belt grinding device 12, the solenoid valves V1 and V2 for controlling the corresponding pressing members 23 are pressed. By controlling, it is possible to perform optimum grinding and polishing corresponding to the widthwise state of the processed material w based on the widthwise row data D from the processed material detector S group.

FIG. 11 shows a structure in which the slit 55 is formed in the slit plate 54 corresponding to the sine wave. In this configuration, the interval between the slits 55 is set in advance corresponding to the movement of one pressing member 23. For this reason, only by the detection by the sensor 51, it is possible to reverse the corresponding pressing member 23 and update the correspondence relationship without using a complicated calculation formula, and the calculation becomes easy.

In the above-mentioned embodiment, the pressure converter is provided with the low pressure air source P1 and the high pressure air source P2 and the solenoid valves V1 and V2. However, in the present invention, A configuration in which only a single air source and a solenoid valve are provided and the pressing member 23 is converted only between a pedaling position and a non-pedaling position can also be applied.

[0054]

According to the present invention, as described above, each pressing member 2
By separately controlling the stepping force of 3 on the basis of the width direction row data D from the processed material detector S group, a function of performing grinding and polishing corresponding to the widthwise state of the processed material is provided. A reciprocating motion of the belt grinding device 12 in the width direction to prevent the waviness x of the endless sanding belt 16. Since the relationship with the material detector S group is kept almost immediately before and after, even if there is such movement, the optimum pedaling action based on the width direction row data D can be applied, and various processed materials can be applied. There is an excellent effect that a good grinding / polishing process corresponding to the above shape can be performed.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an example of a belt sander machine to which the present invention is applied.

FIG. 2 is a vertical side view of a pedaling device P.

FIG. 3 is a front view showing a left portion of a treading device P by cutting.

4 is a partially cutaway side view of a processed material detector S. FIG.

FIG. 5 is a front view of a processed material detector S group.

FIG. 6 is a block diagram of a control device.

FIG. 7 is a flowchart showing an example of data processing control.

FIG. 8 is a plan view showing the positional relationship between the processed material W, the detection roll 30, and the pressing member 23.

9 is a side view showing an example of a slit plate 54. FIG.

10 is a front view showing an example of a slit plate 54. FIG.

11 is a front view showing another example of the slit plate 54. FIG.

FIG. 12 is a perspective view of an endless sanding belt c showing a problem of the conventional configuration.

[Explanation of sign]

 4 Material feeding device 10 Main body frame 11 Sanding frame 12 Belt grinding device 16 Endless sanding belt 23 Pressing member 30 Detection roll 41 Reciprocating drive motor 46 Crank mechanism 51 Sensor 52 Timer 54 Slit plate 55 Slit P Treading device P1, P2 Air source V1 , V2 Solenoid valve S Processed material detector CPU Central control unit

Claims (2)

[Claims] 1. One to a plurality of belt grinding devices, 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 plurality of pressing members that are provided in opposition to the material feeding device via the material feeding passage, and that are arranged in a row in the width direction of the material feeding passage, and a large number of cylinder rods are connected to the respective pressing members. An air cylinder is provided, and a large number of processed material detectors corresponding to each pressing member are arranged in a row in the width direction in front of the pedaling device, and each pressing is performed based on the width direction row data from the processed material detector group. In a wide belt sander machine equipped with a pressure conversion device configured to perform pressure control to each air cylinder connected to a member, in a wide belt sander machine, a crank mechanism in which a reciprocating drive motor rotates a crank shaft, Be A reciprocating drive device for continuously reciprocating the grinding device in the width direction with respect to the material feeding device, a width position detecting means of the belt grinding device, and a moving distance from the original position of the belt grinding device based on the width position detecting means. Then, the corresponding relationship between each pressing member and each processed material detector is shifted in the opposite direction by the number of pressing members corresponding to the moving distance, and each processed material detector and each pressing member are almost immediately before each other. A wide belt sander machine, comprising: a central control device that sequentially updates the correspondence so as to correspond at a rear position and controls the pressure conversion device based on the correspondence. 2. The wide belt sander according to claim 1, wherein the width position detecting means is constituted by a sensor for detecting a predetermined rotation position of any rotation shaft of a drive system of the crank mechanism. Machine.