JPH1044015A - Automatic material feeding interval setting device for sanding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic material feeding interval setting device capable of automatically and accurately adjusting material feeding intervals. SOLUTION: An elevation adjusting platform 30 energized upward at the position immediately under the polishing end (e) of a sanding head is provided and the elevation adjusting platform 30 is pushed down by the polishing end (e),which is relatively lowered with respect to the material feeding surface, while an optimum material feeding interval between the polishing end (e) and the material feeding surface is computed at the basis of the height position of the polishing end (e) when the reference protrusion position of the elevation adjusting platform 30 is detected by a reference sensor S and the material feeding interval is set by the computed value by means of further driving and controlling an elevation driving gear.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sanding machine for grinding and polishing a metal material or wood, and a material feeding device thereof;
The present invention relates to an automatic feed interval setting device for automatically setting a feed interval between a sanding head and a polishing end.

[0002]

2. Description of the Related Art The setting of a material feeding interval between a material feeding device of a sander machine and a polishing end is performed by a relative movement of the material feeding device and a sanding head, and the thickness of a sanding belt or sanding paper is set. The height of the polished end is displaced due to variations in the height of the polished end and wear of the pad. Therefore, the reference position must be appropriately adjusted by actual measurement. Therefore, conventionally, the sanding belt is started, the sanding head is slowly descended as it is, the sanding belt is brought into contact with the material feeding belt, the load current generated by the contact resistance is detected, and the descending stop is performed. With the origin as the origin, the sanding head was moved up and down to adjust the material feeding interval.

On the other hand, means for adjusting the thickness by providing a plate thickness adjusting jig has also been proposed in Japanese Utility Model Laid-Open No. 58-19552. This device comprises an elevating and lowering body in which a receiving surface is held at a predetermined floating position by a spring, and a proximity switch for detecting a predetermined lowering position of the lifting and lowering body in a housing. The position at which the body is pushed down and the proximity switch is turned on accordingly is set as the origin of the polishing end.

[0004]

By the way, as in the former, the polishing end is brought into contact with the material feeding belt and the position is set based on the load current generated by the frictional resistance. There is a problem that the wear is shortened, the life is shortened, and the grinding load is different, so that it is difficult to accurately set the reference position.

[0005] In the means using the sheet thickness adjusting jig as described above, a sheet thickness adjusting jig, which is a separate member, is inserted between the polished end of the sanding belt and the material feeding surface of the material feeding device. ,
The height of the head had to be adjusted, which was close to manual operation, and the adjustment work was troublesome. An object of the present invention is to provide an automatic material feeding interval setting device capable of automatically performing such adjustment.

[0006]

According to the present invention, there is provided a raising / lowering drive device for relatively moving a sanding head and a material feeding surface of a material feeding device toward and away from each other. A lifting and lowering adjustment table is provided on the material device, and the lifting and lowering adjustment table can be moved up and down by an upward biasing device to a position where the upper surface thereof coincides with a material feeding surface and a position protruding upward. Equipped with a reference sensor that detects the reference protruding position of the table, the central control device drives and controls the lifting drive device, lowers the polishing end of the sanding head relative to the material feeding surface, and adjusts the polishing end up and down Press the table and move it down until at least the reference protrusion position of the elevation adjustment table is detected by the reference sensor, and based on the height position of the polishing end when detected, the appropriate distance between the polishing end and the material feeding surface Divide the feed interval And, by its indexing value is feed material spacing the automatic setting device sander machine, characterized in that the lifting drive system and to set the drive control to feed material intervals.

As described above, the relative movement of the sanding head determines the polished end to be at the reference height position, and from this, the origin position of the polished end can be set. Even when the thickness of the abrasive material, sanding belt, etc. changes, and the position of the polishing end is displaced, the origin position of the polishing end does not change and can respond to the change. You will get.

[0008] Here, the polishing end is pressed against the upper surface of the lifting and lowering adjustment table to lower the lifting and lowering adjustment table.
The polished end may be compressed by the pressing force. Therefore, the origin of the polished end is set by subtracting the crushing allowance of the polished end from the reference height position of the polished end when the reference projection position of the lifting / lowering adjustment table is detected by the reference sensor. Alternatively, an appropriate material feeding interval between the polished end and the material feeding surface may be determined. As a result, the influence of the crushing allowance is eliminated, and by inputting the thickness of the work material, the grinding allowance, and the like to the central control device, the material feeding interval is accurately set based on the origin.

Here, the sanding head may include a grinding portion provided with an abrasive on the lowermost surface of the polishing pad, and a lower end of the grinding portion may be a polishing end. It may be a belt sanding head.

[0010]

FIG. 1 shows a sander 1 suitable for grinding and polishing metal materials to which the present invention is applied. Here, as shown in FIG.
It has two sanding heads 12a and 12b disposed on the material feeding device 3. Further, a pair of two pressing rolls 9, 9 are provided before and after the sanding heads 12a, 12b, respectively. This presser roll 9,9
Are controlled by the air cylinders, respectively, so that the work material is held from above and before and after the sanding heads 12a and 12b so that the workpiece can run stably without losing the polishing resistance.

In the material feeding device 3, a material feeding belt 6 is stretched over a driving roller 4 and guide rollers 5a and 5b. the Okuzai motor M ₁ which rotates, and so as to travel in one direction in favor of said transmission member belt 6 in Okuzai support surface 8. Further, 10 rows of feeding rollers are disposed before and after the feeding apparatus 3, and a feeding path 11 in the left and right direction is formed on the feeding support surface 8 and the row of 10 feeding rollers. Furthermore, the material feeding device 3
A workpiece detector L is provided at the entrance side of the workpiece to detect arrival of the front end of the workpiece and passage of the rear end of the workpiece.

Next, the construction of the sanding heads 12a and 12b will be described with reference to FIGS. A worm wheel, in which an elevating shaft 14 is rotatably suspended by being supported at the upper end by a shaft support housing 13 and fixed to the elevating shaft 14, is controlled by an elevating motor M _2. The rotation of the elevating shaft 14 is controlled by meshing with the shaft 18. Thus, the sanding heads 12a and 12b and the material feeding device 3 are driven by the lifting motor M ₂ and the drive system.
The lifting and lowering drive device moves relatively close to and away from the material feeding surface.

The rotation of the elevating shaft 14 is controlled by the shaft support housing 13.
Inside, a slit of a slit plate (not shown) fixed to the elevating shaft 14 is read by a proximity sensor, and the number of readings is read by counters C ₂ and C connected to a central control unit CPU described later.
Counted in ₄ detects the amount of rotation of the elevator shaft 14 by the counted value reaches a predetermined count, carried out by driving stop command of the elevating motor M ₂ (see FIG. 5).

An elevating frame 19 is screwed to the lower end of the elevating shaft 14, and the elevating frame 19 is moved up and down along an elevating guide 20 by the rotation of the elevating shaft 14. Further, a mounting plate 21 is supported on the lifting frame 19 via a width-direction guide 24, and a pad frame 28 supporting a polishing pad 25 via supporting shafts 22, 22 is mounted on the mounting plate 21. Supported. The mounting plate 21 reciprocates in the width direction with respect to the elevating frame 19 via the width direction guide 24 by a driving device (not shown).

The support shaft 22 rotates via a drive guide mechanism 27. The lower end of the support shaft 22 supporting the pad frame 26 is rotated by an eccentric shaft mechanism in a bearing cylinder 23 in accordance with the amount of eccentricity.
A slight rotation is given to the leveling motion.

The polishing pad 25 comes into contact with the surface of the workpiece while the reciprocating movement of the mounting plate 21 in the width direction and the leveling movement of the support shaft 22 are superimposed. The polishing pad 25 is made of a rubber plate, and a polishing material 26 having a lower end surface as an abrasive surface is joined to a lower portion thereof, and the lower end surface is used as a polishing end e, whereby the grinding pad 25, the polishing material 26 Constitutes the grinding section.

The polishing pad 25 is provided with a lifting motor M ₂
Is controlled by the central control unit CPU to automatically raise and lower together with the sanding heads 12a and 12b. As described later, the polishing edge e is positioned, and the material feeding interval of the material feeding passage 11 is reduced. Is set corresponding to the thickness of

In the material feeding device 3, the polishing pad 25
The elevation adjustment table 30 according to the main part of the present invention shown in FIG. In a normal state, the elevation adjustment base 30 is supported by a locking step 34 formed on the material support surface 8, and the upper surface of the elevation adjustment table 30 is flush with the material support surface 8 at the locking position. And a part of the belt guide surface. The elevating table 30 is fixed to the upper end of a rod 32 of an air cylinder 31 that constitutes an upward biasing device. Then, by controlling the solenoid valve 38 to communicate the pressurized air to the air cylinder 31, the elevation adjustment table 30 is urged upward as shown in FIG.
Will rise to the top.

On the other hand, on the side of the air cylinder 31, a reference sensor S for detecting the piston 33 is provided. The reference sensor S is turned off when the elevation adjustment base 30 is at a predetermined reference position, and detects the reference position.

The elevation adjustment table 30 is controlled by the central control unit CPU shown in FIG. The central control unit CPU includes a graphic panel 40, a memory 41,
Counter C ₁ -C ₄ and the input-output device I / O is connected. Then, under the control of the central control unit CPU,
Feeding interval adjustment is automatically performed.

That is, as will be described later in detail, when a material feeding interval adjustment mode (origin setting) is commanded using the graphic panel 40, the elevating and lowering adjustment base 30 is raised, and the upper surface thereof is raised from the material supporting surface 8. even with the uppermost position protruding upward, lifting motor M ₂ is driven polishing pad 25 is lowered. Then, at the polishing end e, the lifting / lowering adjusting table 30 is pushed down, and the reference pad S is detected (off-converted) by the reference sensor S to thereby lower the polishing pad 25.
Is stopped, and the origin position is calculated from the position of the polishing end e at this time. In other words, the sanding head 1
2a and 12b are moved up and down so that the ground end thereof is at a reference height position that matches the reference dimension A, so that even if there is a change in the thickness of the polishing pad or the like, it is not affected by this change. The crushing allowance dimension B is subtracted from the position to determine the origin position of the ground end e, and the material feeding interval is set based on the origin position.

Incidentally, it is not always necessary to stop descending in synchronization with the off-conversion of the reference sensor S, and it is sufficient that such an off-conversion position is stored in a memory. Therefore, the downward movement stroke of the elevation adjustment base 30 needs to be a stroke at which the reference projection position is detected by at least the reference sensor.

Next, the origin position of the polishing end e of the polishing pad 25 is accurately determined by subtracting the predetermined dimension B of the polishing pad 25 from the reference dimension A. That is, the reference dimension A and the crushing allowance dimension B are dimensions that are determined in advance, and the difference C
(= AB) is the origin of the height of the polishing end e of the polishing pad 25. Then, based on the determined origin, the feeding interval is set so as to be adapted to the thickness of the applied processing material.

The process will be further described in detail with reference to the flowchart of FIG. First, the material feeding interval adjustment mode (origin setting in FIG. 8) is started. This allows
The reference dimension A and the crushing allowance B are provided on the graphic panel 40.
Are sequentially displayed, and this is confirmed. This reference dimension A
Is determined by the position of the reference sensor S. The crushing dimension B is equivalent to the sum of the elasticity of the polishing pad 25 made of a rubber plate and the elasticity of the abrasive 26, and differs depending on the material and the like. Is input in advance.

Next, the solenoid valve 38 is switched, the rod 32 of the air cylinder 31 extends, and the elevation adjustment base 30 is raised to the uppermost position. At this elevated position, the reference sensor S is turned on.

Next, the lift motor M ₂ is driven to lower the polishing pad 25, and the lift end e presses the lift adjustment table 30 via the material feeding belt 6 at the polishing end e. And polishing pad 2
5, the piston 33 descends, and the reference sensor S
When the piston 33 comes to the position, the reference sensor S
Is turned off. That reference sensor S by the reference projected position of the vertical adjustment table 30 is detected, the lift motor M ₂ is driven stops accordingly. At this time, the polishing end e
The position is the reference dimension A. In this manner, the sanding heads 12a and 12b are lowered so that the polishing end e thereof is at the reference height position which coincides with the reference dimension A. I try not to be affected.

Accordingly, the crushing dimension B is subtracted from the reference dimension A as a correction value to determine the C dimension position, and this position is set as the origin of the polished end.

Next, the thickness T of the work material and the grinding thickness t are input. If the grinding thickness t is always constant, only the thickness T of the workpiece may be input. At this time,
If the grinding thickness t needs to be corrected, the crushing allowance dimension B
May be performed by correcting. Further, the grinding thickness t may be ignored as data, and only the crushing dimension B may be input on the assumption that the crushing dimension B = the true crushing dimension-the grinding thickness t. This is because, as will be described later, the cover and crush allowance dimension B is a value that can be appropriately corrected while observing the polished state of the work material surface, and can be regarded as an empirical value.

As a result, the (T−C−t) dimension is automatically calculated, and the target count value is set in the counters C ₂ and C ₄ .
Then, until the counter C _2, C ₄ counts digestion, lifting motor M ₂ is driven, the polishing pad 25, the computed dimension of rising (falling in the case of a negative). As a result, the height of the lower surface (polishing end e) of the polishing material 26 of the polishing pad 25 is set at a position (Tt) from the upper surface (material feeding surface) of the material feeding belt 6.

[0030] The polishing is started, Okuzai motor M ₁ is driven, Okuzai belt 6 travels. Therefore Insert the workpiece, pulse whose front end is detected by the workpiece detection element L, reads the passage of the slit of the slit plate m attached to the drive shaft Okuzai motor M ₁ in proximity switch n, generated from the switch Are counted by counters C ₁ and C ₃ , compared with the set values, and in synchronization with the count-up, when the leading end of the workpiece comes directly below the polishing pad 25 of each sanding head 12a, 12b, a count-up signal is output. the become a trigger signal, the lift motor M ₂ is driven, the polishing pad 25
Descends, and the abrasive 26 comes into contact with the surface of the work material and polishes the surface.

At this time, as described above, the polishing pad 25 comes into contact with the widthwise and minute scanning rotation, and the surface of the work material is uniformly polished.

Next, similarly, when the rear end of the workpiece is read by the work detector L and the rear end of the workpiece is located directly below the polishing pad 25 of each of the sanding heads 12a and 12b,
The counters C ₁ and C ₃ are counted and digested, and the elevating motor M ₂
Drives to retreat the polishing pad 25 upward. As described above, the vertical movement of the polishing pad 25 is controlled in accordance with the arrival of the front end of the work material and the passage of the rear end, thereby preventing the end of the work material from dripping.

It is checked whether the surface of the work material is polished well. If not, the dimension B is corrected and the height of the lower surface (polishing end e) of the abrasive 26 is readjusted. I do.

Even if the position of the polishing end e at the lower end of the polishing material 26 is appropriately displaced due to the wear of the polishing material 26 or the replacement of the polishing pad 25, the above operation is performed.
By simply inputting the thickness T of the work material, the polishing end e can be automatically positioned at the optimum height on the material feeding support surface 8.

The above operations are performed by the graphic panel 40
While checking the above, the process proceeds by selection with a mouse or direct designation from the screen. The relationship between the screen and the designation input will be roughly described with reference to the display screen diagrams of FIGS.

FIG. 7 shows a menu screen. When the above-mentioned position adjustment of the polishing end e is performed, "origin set" is designated. As a result, as shown in FIG. 8, the current position of the polishing end e of each of the sanding heads 12a and 12b is displayed. When one or both are designated and the start is designated, as described above, the elevation adjustment table 30 is set. Rises, the elevation adjustment table 30 is pushed down by the polishing pad 25, the lower surface (polishing end e) of the abrasive 26 is positioned at the position of the reference dimension A by the reference sensor S, and the origin dimension C is calculated by the above calculation. . During this operation, the current value is variably displayed. When correcting the crushing allowance dimension B, the screen shown in FIG. 9 is output, the dimension B is checked on this screen, and if necessary, the numerical value is changed by designating “change”. Thereby, the crushing allowance dimension B can be adjusted at will.

Next, FIGS. 10 and 11 show a configuration in which the present invention is applied to a belt sander machine most suitable for grinding and polishing wood. Here, above the lower frame 50,
Lifting frame 51 which is driven and controlled is provided by a lifting motor M ₄ constituting the elevation driving device together with its drive system. And the lower frame 50, Okuzai frame 57 is supported, on the longitudinal position of said transmission member frame 57, the driving roller 54 and driven roller 55 which is driven and controlled by Okuzai motor M ₃ is rotatably supported, the rollers A material feeding belt 56 is stretched around 54 and 55 to form a material feeding device 53.

The lifting frame 51 includes a lifting guide rod 5.
8 and 58, the lifting guide rods 58, 52 are supported on the material feeding device 53, and are rotated by the lifting screws 52, 52.
Ascend and descend using 58 as a guide. And this lifting frame 5
1, the sanding head 60 is supported. In the sanding head 60, a steering roller 62 also serving as a guide roller and a tension roller is pivotally supported on an upper portion of a head frame 61, and a drive guide roller 63 and a driven guide roller 64 are pivoted before and after a lower portion of the head frame 61. The rollers 62, 63, 64 are supported as a group of guide rollers, and an endless sanding belt 65 is stretched around the guide rollers.

A stepping pad 66 is provided between the driving guide roller 63 and the driven guide roller 64, and the surface of the endless sanding belt 65 immediately below the stepping pad 66 is a polished end e. A treading pad 66 is pressed against the surface of the running workpiece through an endless sanding belt 65, and a polishing end e of the endless sanding belt 65.
As a result, the workpiece is ground and polished. The tread pad 66 is converted into a tread position and a tread release position by a pad cylinder 67.
Is controlled by the solenoid valve 79.

In such a configuration, the position of the polishing end e changes due to the thickness and wear of the endless sanding belt 65 and the stepping pad 66. Therefore, the present invention is applied, and the position of the polishing end e is changed. It is automatically set and the material feeding interval is adjusted.

That is, the elevation adjusting table 70 according to the present invention is disposed immediately below the stepping pad 66. In the normal state, the elevation adjustment table 70 is
Is made flush with the support surface of the material feeding belt 56, and constitutes a part of the belt guide surface. This elevation adjustment table 70
Is fixed to the upper end of the rod of the air cylinder 71. The pressurized air is communicated to the air cylinder 71 by the control of the solenoid valve 78, so that
Is lifted and floats while lifting the material feeding belt 56.

On the other hand, on the side of the air cylinder 71, a reference sensor S for detecting the piston 73 is provided. The reference sensor S is turned off when the elevation adjustment base 70 is at a predetermined reference position, and detects the reference position.

The elevating table 70 is controlled by a central control unit CPU shown in FIG. The central control device CPU constitutes a material feeding interval automatic setting device, which is basically the same as the configuration of FIG. 5 already described in detail. Similarly, this central control unit CPU
The graphic panel 80, memory 81, counter C ₅ -C ₆ and the input-output device I / O is connected.

Under the control of the central control unit CPU, the material feeding interval is automatically adjusted. That is, through the graphic panel 80, to specify the Okuzai interval adjustment mode, when you run, becomes uppermost position lift adjustment table 70 is raised, lifting motor M ₄ is driven lift frame 51
Descends. Then, following this, the lifting frame 51
The sanding head 60 descends with the treading pad 6.
Polished end e of the surface of the endless sanding belt 65 directly below
Then, the lifting / lowering adjusting table 70 is pushed down, the reference sensor S detects the piston 73 and is turned off, and accordingly, the lowering of the lifting / lowering frame 51 is stopped. Thus, the polished end e is positioned at the position of the reference dimension A. Further, from now on, the preset endless sanding belt 6
5. The origin position of the polishing end e of the polishing pad 25 is accurately determined by subtracting the amount of the crushing dimension B of the stepping pad 66. Then, based on the calculated origin, the feeding interval is automatically set so as to match the thickness of the applied work material.

As described above, except that the height of the polishing end e is set by moving the sanding head 60 up and down with respect to the material feeding device 53, the sanding head 60 operates according to the same flow as in FIG. Sets the origin.

[0046] The polishing is started, the driven Okuzai motor M _3, Okuzai belt 56 travels. Therefore, the work material is inserted, and the front end is detected by the work detector L,
Okuzai reading the passage of the slit of the slit plate 90 mounted on the drive shaft of the motor M ₃ in the proximity switch 91, a pulse generated from the switch and counted by the counter C _5, in synchronization with the count-up, the workpiece Is the tread pad 6
When it comes directly below 6, the count-up signal triggers the solenoid valve 79 to switch. Along with this, pressure is supplied to the pad cylinder 67, the treading pad 66 is at the treading position, and the endless sanding belt 65 immediately below the treading pad 66 is pressed against the surface of the workpiece to polish the surface.

Further, similarly, the rear end of the work material is read by the work detector L, and when the rear end of the work material is located immediately below the tread pad 66, the counter C ₆ is counted and digested.
The solenoid valve 79 is switched, the pad cylinder 67 is depressurized, and the treading pad 66 is set to the non-treading position.
The endless sanding belt 65 immediately below 6 is released from pressure contact with the surface of the work material. As described above, the treading pad 66 generates a treading action when the front end of the work material arrives, and the treading pad 66 is converted to the non-treading position with the arrival of the rear end, thereby preventing end drooping of the work material. Becomes

In each of the above-described configurations, the sanding head is moved up and down with respect to the material feeding device in order to set the origin of the polishing end e. Ascending and descending, polishing edge e
May be set.

FIG. 12 shows a belt sander in which the sanding head 92 is fixed and the material feeding device 93 is moved up and down. In such a configuration, the upper frame 91 is fixed to the base frame 90, the sanding head 92 is mounted on the upper frame 91, and the material feeding device 93 is further mounted on the base frame 90 by the lifting screws 95, 95. supporting, that where the feed material surface of said transmission member 93 so as to face the grinding edge e of sanding belt, the lifting drive system by driving the lifting motor M ₅ constituting together with its drive system, the lifting The lifting screws 95, 95 are rotated via the driving mechanism 97, and thereby the lifting and lowering of the material feeding device 93 can be controlled. Then, a lifting / lowering adjusting table 98 is provided in the material feeding device immediately below the grinding edge e to provide the configuration of the present invention.

This operation is the same as that of the above embodiment, except that the material feeding device 93 moves up and down with respect to the grinding edge e to determine the origin of the grinding edge e, and a description thereof will be omitted. .

In each of the above-described structures, the polishing end e is
0, the crushing allowance dimension B is used as a calculation element because it is pressed against the elevation adjustment base 70 and compressed. However, when the compression amount is small or the compression is not performed at all, only the reference dimension A is used. The origin of the polished end e may be determined. That is, in this case, the reference height position of the polishing end e is the origin position.

[0052]

According to the present invention, there is provided an elevating adjustment table which is urged upward just below the polishing end e of the sanding head, and lowers the sanding head relative to the material feeding surface.
The lifting end is pushed down by the polishing end e, and the origin position of the polishing end e is determined based on the height position of the polishing end e when the reference sensor S detects the reference projecting position of the lifting adjustment base, and the index is determined. The lifting drive device is further driven and controlled according to the value to set the material feeding interval. Therefore, the polishing end e is always positioned at the reference height,
Since the material feeding interval is set based on the polishing end e, even if the thickness of the polishing material such as a polishing pad or a sanding belt changes, the change is not affected by this change, and the processing material is not affected. The material feeding interval corresponding to the thickness can be set as accurately as possible. Further, unlike the conventional configuration, the feed belt is not worn when setting the feed interval. Further, unlike the configuration using the conventional plate thickness adjusting jig, the interval can be automatically set, so that the workability is good.

Further, when the polishing end e is pressed against the upper surface of the lifting and lowering table and the lifting and lowering table is lowered, even if the polishing end e is compressed by its pressing force, even if the polishing end e is compressed. By subtracting the crushing allowance of the polishing end e at the reference height position, an origin of the polishing end e is set, and based on the origin, an appropriate material feeding interval between the polishing end e and the material feeding surface is determined. By doing so, the material feeding interval can be accurately set without being affected by the crushing of the polishing end e.

[Brief description of the drawings]

FIG. 1 is a side view of a sander according to a first embodiment of the present invention.

FIG. 2 is a schematic side view of a main part.

FIG. 3 is a front view of the sanding heads 12a and 12b.

FIG. 4 is an enlarged side view showing the operation of the elevation adjustment base 30.

FIG. 5 is a block diagram of the first embodiment.

FIG. 6 is a flowchart showing an operation sequence.

FIG. 7 is a front view showing a menu screen of the graphic panel 40.

FIG. 8 is a front view showing an origin setting screen of the graphic panel 40.

FIG. 9 is a front view showing a correction screen for the crushing allowance data of the graphic panel 40.

FIG. 10 is a side view of a belt sander according to a second embodiment of the present invention.

FIG. 11 is a block diagram of a second embodiment.

FIG. 12 is a side view of a belt sander according to a third embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 3 material feeding device 6 material feeding belt 8 material feeding support surface 12a, 12b sanding head 25 polishing pad 26 abrasive 30 lifting / lowering adjustment table 31 air cylinder (upward biasing device) 51 elevating frame 53 material feeding device 56 material feeding belt 60 sanding head 65 endless sanding belt 66 treading pad 70 lifting adjustment table 71 the air cylinder M ₁ Okuzai motor M ₂ lifting motor M ₃ Okuzai motor M ₄ lifting motor M ₅ elevation motor S reference sensor

Claims (4)

[Claims] An elevating drive device for relatively moving the sanding head and a material feeding surface of the material feeding device toward and away from each other; The vertical adjustment table is vertically movable by an upward biasing device between a position where the upper surface thereof coincides with the sheet feeding surface and a position where the vertical adjustment table protrudes upward, and detects a reference projecting position of the vertical adjustment table. Equipped with a reference sensor, the central control device controls the drive of the elevation drive device, lowers the polishing end of the sanding head relative to the material feeding surface, and the polishing end presses the elevation adjustment table, at least the reference sensor The lowering of the height adjustment table is performed until the reference protruding position is detected, and based on the height position of the polishing end at the time of detection, an appropriate material feeding interval between the polishing end and the material feeding surface is calculated, and the index is calculated. By value , Feed materials interval automatic setting device sander machine, characterized in that the lifting drive system and to set the drive control to feed material intervals. 2. A central control device controls the drive of a lifting drive device, lowers a polishing end of a sanding head relative to a material feeding surface, and the polishing end presses a lifting / lowering adjustment table, and at least a reference sensor is provided. By moving the base downwards until the reference protruding position of the lifting / lowering adjustment table is detected, the height position of the polished end at the time of detection is set as the reference height position, and the crushing margin of the polished end is subtracted from this, and polishing is performed. 2. An origin of an end is set, and an appropriate feeding interval between a polished end and a feeding surface is calculated based on the origin.
Automatic material feeding interval setting device for the sander described. 3. The polishing head according to claim 1, wherein said sanding head has a grinding portion provided with an abrasive on the lowermost surface of said polishing pad, and a lower end of said abrasive is a polishing end. 3. The automatic material feeding interval setting device for a sander according to claim 1. 4. The sanding head according to claim 1, wherein the sanding head is a belt sanding head, and a lower end of a pad of a sanding belt running on a lower surface of the polishing pad is used as a polishing end. Automatic setting device for material delivery interval of sander machine.