JPH0798308B2 - Wide belt sander machine - Google Patents

Description

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

[Prior Art] An endless sanding belt is hung on a belt driving mechanism provided in a sanding frame, a treading device is arranged on the side of a material feeding passage, and the treading surface is brought into contact with the inner surface of the belt. A wide belt sander machine in which a grinding head is opposed to a material feeding device via a material feeding passage is known.

On the other hand, when the endless sanding belt is pressure-contacted with the single pressing member over the entire width of the processed material, the edge of the processed material falls to cause edge drooping.

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

As further disclosed, as disclosed in JP-A-1-109165, two or more, which detect the passage of the front end and the rear end of the processed material within the width interval corresponding to each pressing member in front of the treading device. The work material detectors of the above are installed, the ON / OFF of the adjacent work material detectors of a plurality of units is discriminated, and the air cylinder connected to the pressing member on the end edge of the work material is connected to the low pressure air source. There has also been proposed a configuration in which an air cylinder connected to a pressing member corresponding to the inside of the processed material is connected to a high-pressure air source so that the edge of the processed material is depressed with a weak force.

[Problems to be Solved by the Invention] The processed material w to be applied includes a material having a depression (see FIG. 7A) and a material having a warp (see FIG. 7B). By the way, if these processed materials w are uniformly ground and polished in the same manner as the flat plate-shaped processed materials, they are not ground and polished at the recessed portion x and the central portion y where there is no warp, or if there is a warped material, the peripheral edge This causes a problem that the warped portion e is excessively ground and polished.

The present invention aims to eliminate such conventional drawbacks.

[Means for Solving the Problems] The present invention includes a pressing member for stepping on an endless sanding belt indirectly or directly, and a pressing device for converting the stepping surface of the pressing member into a lowered position and a standby position. The provided tread parts are arranged side by side in the front-back direction along the material feeding direction, and the central tread part is the deep tread part for dented surface grinding, and both sides are the reference tread parts for surface grinding. The treading device has a treading device in which the descent position of the treading surface of the treading portion is set to be lower than the descent position of the treading surface of the reference treading portion, and a workpiece detection device is provided in front of the treading device, When the thickness of the processed material is detected by the processed material detection device, if it is a predetermined thickness, the tread surface of the reference tread part is lowered so that it is pressed against the endless sanding belt side. The tread surface of the tread section is lowered and It is designed to be pressed against the Govert side.

This structure is also applicable to a structure in which a pedaling portion is configured by a single pressing member, but a large number of pressing members arranged in a row in the width direction of the material feeding passage and each pressing member are activated. Japanese Patent Publication No. 51-48312 and Japanese Patent Application Laid-Open No. 59-11515 in which a pedaling portion is formed by providing a large number of pressurizing devices such as air cylinders.
It can also be applied to those disclosed in JP-A No. 4-109165 and the like.

As the processed material detection device, a first processed material detector that detects the presence or absence of a processed material and a second processed material detector that detects that the surface of the processed material is at or above the reference height are provided as pressing members. It is configured by arranging a number of rows corresponding to the front and back, and at the same time as the arrival of the processing material due to the processing material detection of only the first processing material detector, at least the pressing device of the deep depression portion is driven, It is only necessary to drive the pressurizing device of the reference stepping portion when the processed material arrives due to the detection of the processed material by the second processed material detector.

Alternatively, as the processing material detection device, a processing material detector composed of a non-contact type distance sensor that detects a separation distance from the processing material is formed by arranging a plurality of rows in correspondence with each pressing member in the front and back, and non-contacting. The distance information to the workpiece surface detected by the die distance sensor is composed of a long distance value 1 for determining the presence or absence of the workpiece and a short distance value s for determining that the workpiece surface is at or above the reference height. Distance value s compared with two thresholds l, s
Due to the determination of the distance value between the distance value 1 and the distance value l, at least the pressing device of the deep pressing portion is driven with the arrival of the processed material to convert the pressing surface into the lowered position, and the distance value is determined to be the distance value s or less. Due to this, when the processed material arrives, only the pressurizing device of the reference treading portion may be driven to convert the treading surface into the lowered position.

[Operation] The height of the main surface of the processed material with depressions is set as the reference height in advance. In addition, for a processed material having a warp, the highest position where the warp occurs is set as a reference height in advance.

As a result, when the work height is equal to or higher than the reference height, the work material is subjected to a predetermined treading pressure by the reference treading portion and subjected to required grinding and polishing. On the other hand, if the height is less than the reference height, the deep pressure portion is also driven. Since each pressing member of the deep pressing portion is in a lower position when pressing than the pressing member of the reference pressing portion, the surface of the work material having a height less than the reference height is pressed by the deep pressing portion and ground and polished. Become.

[Embodiment] Implementation of the present invention in which a large number of pressing members arranged in a row in the width direction of the material feeding passage and a large number of pressurizing devices such as air cylinders for operating the pressing members are provided. An example accompanying drawing will be described.

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

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

2 and 3 show the structure of the pedaling device 12.

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. The tread frame 14 has a large number of tread bars 15a, 15b,
15a is held so as to be able to move up and down in three rows in the front and rear, and springs 17a, 17b, 17a attached to sliding grooves 16a, 16b, 16a around the 15a urge the pedal pressure bars 15a, 15b, 15a upward. .

Further, pressing members 18a, 18b, 18a are fixed to the lower ends of the pedaling bars 15a, 15b, 15a extending in the width direction.

Further, an elastic body 19 made of sponge or the like is arranged so as to cover the pressing members 18a, 18b, 18a 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 ends of the pedal pressure bars 15a, 15b, 15a are connected to the piston rods of the front and rear air cylinders 22a, 22b, 22a fixed to the mounting frame 13, and by the introduction of compressed air into the air cylinders 22a, 22b, 22a, The pistons in the air cylinders 22a, 22b, 22a are lowered against the springs 17a, 17b, 17a, and the lower surfaces of the pressing members 18a, 18b, 18a are brought into pressure contact with the inner surface of the elastic body 19.

The pressing member 18b has a larger amount of depression of the tread surface at the lower position than the pressing members 18a, 18b before and after the pressing member 18b, and all the air cylinders 22a, 22b, 22a are driven as shown in FIG. Then, the tread surface of the pressing member 18b projects downward and the processed material w
Only the pressing member 18b applies the treading pressure to.

Thus, the pressing members 18a, 18a and the air cylinders 22a, 22a are arranged in a row in the left-right direction to form a reference pedal pressure portion 23a at the front and rear portions of the pedal pressure frame 14, and the pressing member 18b and the air cylinder at the center thereof. 22b and the left-right direction are arranged in a row to form a deep pedaling portion 23b, and the sanding belt 1 is formed by the pedaling portions 23a, 23b, 23a.
A treading device 12 for pressing 1 to the processed material w is configured.

In the above-mentioned configuration, the treading portions 23a, 23b, 23a are housed in the single treading frame 14, but each treading frame is supported by the mounting frame 13, and each treading portion is supported. b, the treading portions 23a, 23b, 23a may be housed in treading frames, respectively, thereby forming a treading device 12 in which two treading frames 14a, 14b are adjacent to each other.

Further, an air bag long in the width direction may be interposed between each pressing member 18a, 18b, 18a and the elastic body 19. The air bag and the elastic body 19 may be provided one by one for each of the pressing members 18a, 18b, 18a.

After all, the pressing members 18a, 18b, 18a are the endless sanding belt 1
It is understood as having a function of stepping on 1 indirectly or directly, and the endless sanding belt 11 and the pressing member 18a,
Various pedaling members may be interposed between 18b and 18a.

At the upper part of the material feeding passage 6 before and after the sanding frame 7, there is provided a pressing roll 25 which is pressed to the running material device 5 side by a bullet, and a detection roll 26 is arranged adjacent to the pressing roll 25. There is.

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 to the upper end of the link 27 so that its tip is located near the detection ends of the proximity switches SW ₁ and SW ₂ on the cylindrical body 29, and the processed material w is supplied to the tip thereof. When the detection roll 26 floats upward against the spring 30, the link 27 rotates clockwise around the support shaft 28 and the detection bolt 32
Is separated from the detection ends of the proximity switches SW ₁ and SW ₂ , thereby causing an ON operation (working material detection). Tip of the detection bolt 32 and proximity switch SW ₁ , SW ₂
Adjusting the distance between and the adjustment screw that makes the tip contact the outer surface of the cylinder 29.
This can be done by 33 screwing operations.

Thus, the detection roll 26 and the proximity switches SW ₁ , SW _{2 and the} like constitute a first processed material detector S ₁ and a second processed material detector S ₂ that produce the operation described later, and send the processed material w. When the material is supplied onto the material passage 6 and travels to reach the position of the detection roll 26,
The detection roll 26 rises and the proximity switch SW detects the detection bolt.
It is possible to detect the processed material by detecting the separation of 32.

The operations of the proximity switches SW ₁ and SW ₂ of the processed material detectors S ₁ and S ₂ differ depending on the thickness of the processed material w as described below.

Next, the drive control means of the pedaling device 12 will be described.

The air cylinders 22a, 22b, 22a are driven in synchronization with the arrival of the work material, and press the pressing members 18a, 18b, 18a to the work material side.

The drive control of the air cylinders 22a, 22b, 22a is performed in the front of the treading device 12 by the above-described work material detectors S ₁ and S arranged in the width direction for detecting the passage of the front end and the rear end of the work material w.
₂ and a timing control device that drives each air cylinder 22a, 22b, 22a separately in synchronization with the arrival of the workpiece due to the workpiece detection by the workpiece detectors S ₁ and S _2. And by.

Here, the processing material detection device, the pressing member 18a, 18b, the same number of the above-described first processing material detector S ₁ corresponding to the position that corresponds to the front and rear and 18a are arranged in a row, further in front of it. The same number of second processed material detectors S ₂ are arranged in a row.

The processed material detector S ₁ is for detecting the presence or absence of a processed material, and the distance between the tip of the detection bolt 32 and the detection end of the proximity switch SW ₁ is made close, regardless of the thickness of the processed material.
The proximity switch SW ₁ is turned on with the supply of the processed material. In the case where the second processed material detector S ₂ separates the tip of the detection bolt 32 and the detection end of the proximity switch SW ₂ from each other and the processed material w is equal to or greater than the reference height α (reference thickness) shown in FIG. Only the proximity switch SW ₂ is turned on.

Next, in such a configuration, each air cylinder 22a, 22b,
The operation control means for driving 22a will be described with reference to FIGS.

The air cylinders 22a, 22a are connected to an air source P via _a solenoid valve Va, and the air cylinder 22b is connected to an air source P.
Is connected to the air cylinders 22a, 22 via a solenoid valve _Vb.
The inflow of the compressed air into the b, 22a is blocked, and the control is performed so as to convert it into a non-pedal pressure state in which it communicates with the outside air side and a tread pressure state in which the air cylinders 22a, 22b, 22a communicate with the air source P.

As shown in FIG. 6, the central control unit CPU includes proximity switches SW ₁ and SW ₂ which are the detection sources of the work material detectors S ₁ and S ₂ , sensors k, and the same number corresponding to each pressing member 18a. Is connected to the descending counter C ₁ and the ascending counter C _2, and switching control of the electromagnetic valve V _a for the pressing member 18a is performed in synchronization with the counting and exhaustion of the counters C ₁ and C ₂ .

Here, the solenoid valve V _a is always driven as the counters C ₁ and C ₂ are exhausted. That is, the pressing member 18a is always driven with the arrival of the processed material w in accordance with the ON operation of the descending material detector S ₁ . Further, the solenoid valve _Vb is driven only when the work material detector S ₁ is on and the second work material detector S ₂ is off. That is, the pressing member 18b is driven together with the arrival of the processed material w only when only the processed material detector S ₁ is in the ON operation.

Then, in such a configuration, by turning on / off the first processed material detector S ₁ , the counters C ₁ and C ₂ are driven, and the processed material is accompanied by the predetermined counting of the counters C ₁ and C _2. The values of the counters C ₁ and C ₂ are set so that when the front end is located on the treading device 12, driving and stopping of the treading device 12 occur. Next, a driving mode of the pedaling device 12 will be described.

First, drive the running material device 5 to adjust the height of the feeding path,
As shown in FIG. 7A, the processed material w having a depression has a height of its main surface as a reference height α, and as shown in FIG. Is set as a reference height α, and the second workpiece detection element S ₂ is pre-positioned so that the second workpiece detector S ₂ is turned on at this height.

Here, FIG. 7A shows a side view of the processed material w having a depression, and shows the relationship between the pair of processed material detectors S ₁ and S ₂ and the surface of the processed material along the traveling direction.

On the other hand, FIG. 7B shows a front view of the processed material w having a warp in the width direction, and for convenience, shows the relationship between the processed material detectors S ₁ and S _{2 at} other positions and the surface of the processed material.

Then, when the thickness of the processed material W is the reference height α, the processed material detectors S ₁ and S ₂ detect the processed material, and accordingly, when the counting of the counter C _{1 is completed} , As shown in FIG. 2B, only the air cylinder 22a of the stepping portion 23a is driven, whereby the workpiece w is subjected to the stepping pressure of the pressing member 18a and ground and polished.

On the other hand, since the height of the recess x of the processed material w or the central portion y of the warped material is below the reference, the processing detector S ₁
Only the air cylinders 22a and 22b of the treading portions 23a and 23b are driven. Then, as shown in FIG. 2A, the pressing members 18a and 18b both descend, but the pressing member 18b has a larger descending amount of the tread surface than the pressing member 18a.
Only the pressing member 18b actually applies the pedaling pressure to the processed material w. And by this, endless sanding belt
Reference numeral 11 makes deep contact with the surface of the processed material w, and grinds and polishes the surface of the thin portion such as the depression x.

Here, the pressing members 18a, 18a do not directly contribute to grinding and polishing, but give a required tension to the endless sanding belt 11, whereby the endless sanding belt 11 can maintain a tension state. For example, unless the pressing members 18a, 18a are lowered, wrinkles and the like are generated on the endless sanding belt 11, and good grinding and polishing cannot be performed. Note that only the pressing member 18b may be lowered by supplementing it with another tension mechanism.

In the above configuration, the processed material detectors S ₁ and S ₂ are
As shown in FIGS. 4 and 5, the detection roll 26, the link 27, and the proximity switches SW ₁ and SW ₂ are used as the mechanism, but the proximity switches SW ₁ and SW ₂ are linked to each other as shown in FIG. the arranged vertically, and detection bolts 32a, 32b were arranged up and down so as to respectively face the proximity switch SW _1, SW ₂ to the link 27, the rocking of the link 27 to correspond to the thickness of the workpiece w When the work material w has a reference thickness and the link 27 swings largely, the proximity switches SW ₁ and SW ₂ are both turned on (separated) by utilizing the fact that the working angle changes, and the tilt angle due to the depression or the like. When the value is small, only the upper proximity switch SW ₁ is turned on (separated) to configure the processing material detector S ₁ by the proximity switch SW ₁ , the detection roll 26, the link 27, etc. The child S ₂ can be configured by the proximity switch SW ₂ , the detection roll 26, the link 27, and the like. That is, the detection roll 26 and the like can be configured as a common member.

Next, another embodiment of the processed material detecting device will be described with reference to FIGS.

In front of the pedaling device 12, as shown in FIG. 9, a processing material detector S comprising a non-contact type distance sensor using a laser, an ultrasonic wave, light or the like for detecting a distance from the processing material w.
Are arranged in a row so as to correspond to each pressing member in the front-rear direction to form a processed material detecting device.

Then, as shown in FIG. 10, the distance value to the surface of the processed material w is determined by a comparison circuit or the like connected to the central control unit CPU. The distance information to the surface of the workpiece w detected by the non-contact distance sensor is set with two threshold values l and s consisting of short distance values s for determining that the value is α or more. Compare with. When the distance value is determined to be equal to or less than the distance value s, the counter C ₁ is driven as described above, and at the same time, the counter C ₁ is driven to drive only the air cylinders 22a and 22a of the reference treading portions 23a and 23a. With the arrival of the workpiece w due to the distance value determination of the value between s, the reference treading portion 23
A and the air cylinders 22a, 22b, 22a of the depression pressure portion 23b are driven.

Other configurations are the same as those described above, and the description thereof will be omitted.

In the present invention, the pressing member corresponding to the edge of the processed material w is depressed with a weak force toward the processed material w, and the pressing member corresponding to the inside of the processed material w is depressed with a strong force. It is also possible to apply the configuration disclosed in Japanese Patent Laid-Open No. 1-109165.

Further, the present invention can be similarly applied to a wide belt sander machine having a plurality of grinding heads.

[Effects of the Invention] The present invention relates to the processed material w having the depression x as described above,
When a warped material is applied, the thin portion is pressed by the pressing member 18b, and the portion of the reference height α is pressed by the pressing member 18a. Can be substantially uniformly ground and polished, and there is an excellent effect that can be dealt with when it is required to warp the surface of the processed material w to be beautifully polished, such as coating polishing. .

[Brief description of drawings]

FIG. 1 is a schematic front view of a wide belt sander machine, FIGS. 2A and 2B are vertical front views of the treading device 12, FIG. 3 is a sectional view taken along the line AA of FIG. 2A, and FIG. Partially cutaway front view showing an example of the detectors S ₁ and S ₂ , FIG. 5 is a side view of the same cutout, FIG. 6 is a block diagram of the control device, and FIGS. child S _1, explanatory view showing a relationship between S _2, a side view FIG. 8 is showing another example of a workpiece detector S _1, S _2, FIG. 9 is a block diagram of a control device of the second embodiment, the FIG. 10 is an explanatory view showing the relationship between the processed material w and the processed material detector S. 11 …… Sanding belt 12 …… Treading device 18a, 18b, 18a …… Pressing member 22a, 22b, 22a …… Air cylinder 23a, 23a …… Reference treading part 23b …… Deep treading part 26 …… Detecting roll S ₁ , S ₂ , S …… Processed material detector CPU …… Central control unit C ₁ , C ₂ …… Counter V _a , V _b …… Control valve P …… Air source w …… Processed material

Claims (3)

[Claims] 1. One to a plurality of grinding heads, wherein an endless sanding belt is stretched around a belt drive mechanism, a treading device is arranged on the side of a material feeding passage, and the treading surface is brought into contact with the inner surface of the belt. In a wide-belt sander machine that is installed opposite to a material feeding device through a material feeding passage, a pressing member that directly or directly steps on an endless sanding belt, and a treading surface of the pressing member at a lowered position and a standby position. Three stepping pressure parts equipped with a converting pressure device are arranged side by side in the front-back direction along the material feeding direction, and the central stepping part is used as a deep stepping part for dented surface grinding, and both sides of it are used for surface grinding. A treading device that is set as a reference treading portion, and a lowering position of the treading surface of the deep treading portion is set to be lower than a lowering position of the treading surface of the reference treading portion, and a working material in front of the treading device. The first processed material that detects the presence or absence of Due to the workpiece and the workpiece detection device provided with the second workpiece detector that detects that the surface of the workpiece is higher than the reference height and the workpiece detection only by the first workpiece detector With the arrival of the processed material, at least the pressing device of the deep pressing pressure section is driven to convert the pedaling surface into the lowered position, and with the arrival of the processed material due to the detection of the processed material by the first and second processed material detectors. A wide belt sander machine, comprising: drive control means for driving only the pressurizing device of the reference treading portion to convert the treading surface into a lowered position. 2. A plurality of pressing members arranged in a row in the width direction of the material feeding passage, and a plurality of air cylinders connecting a cylinder rod to each pressing member, the endless sanding belt being indirectly connected by the pressing members. Or, three treading parts for directly treading are arranged side by side along the material feeding direction, the treading part at the center is a deep treading part for dent surface grinding, and both sides are reference treading parts for surface grinding, A treading device configured such that the descending position of the treading surface of the deep treading portion is set to be lower than the lowering position of the treading surface of the reference treading portion, and the presence or absence of a processed material is detected in front of the treading device. Processed material detection in which a first processed material detector and a second processed material detector that detects that the surface of the processed material is at or above the reference height are arranged in multiple rows in correspondence with each pressing member before and after. For workpiece detection only with the device and the first workpiece detector Therefore, at the same time as the arrival of the processed material, at least the air cylinder of the deep pressing pressure section is driven to convert each pressing surface to the lowered position, and the processed material is detected by the first and second processed material detectors. The wide belt sander machine according to claim 1, further comprising: drive control means for driving only the air cylinder of the reference treading portion to convert the treading surface into a lowered position upon arrival. 3. A plurality of pressing members arranged in a row in the width direction of the material feeding passage, and a plurality of air cylinders connecting a cylinder rod to each pressing member, and the endless sanding belt is indirectly connected by the pressing members. Or, three treading parts for directly treading are arranged side by side along the material feeding direction, the treading part at the center is a deep treading part for dent surface grinding, and both sides are reference treading parts for surface grinding, The depression position of the tread surface of the deep tread portion is set so as to be lower than the lower position of the tread surface of the reference tread portion, and in the front of the tread device, the separation distance between the work material and A processing material detector consisting of a non-contact type distance sensor that detects
A long distance value l for determining the presence / absence of a processed material is obtained by using a processed material detection device in which a plurality of rows are provided in front of and behind each pressing member and the distance information to the surface of the processed material detected by a non-contact type distance sensor.
And a two threshold value l, s consisting of a short distance value s for judging that the surface of the processed material is equal to or greater than the reference height, and the processed material is caused by the distance value judgment between the distance value s and the distance value l. At the same time, the air cylinder of at least the deep pedaling portion is driven to convert the pedaling surface into the lowered position, and only the air cylinder of the standard pedaling portion is provided with the arrival of the processed material due to the distance value judgment of the distance value s or less. The wide belt sander machine according to claim 1, further comprising: drive control means that is driven to convert the tread surface into a lowered position.