JPH0624683B2 - Wide belt sanda - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wide belt sander for polishing the surface of wood, inorganic boards, plastics and the like.

[Conventional technology]

The wide belt sander is a machine that grinds the surface with a grinding belt while sending a plate material (work) for processing by a material feeding mechanism. The material feeding mechanism of this machine is based on a roll feeding method and a conveyor belt method. There are two types.

In the case of the material feeding mechanism by the conveyor belt system, as shown in FIG. 12, the center tables B, B, B are fixed directly under the contact rolls A1, A2, A3, respectively, and directly under the upper pinch rolls C, C, C. Inner roll D,
It has a structure in which D and D are fixed and arranged. The inner roll D and the center table B are in contact with the back surface of the conveyor belt F driven by the drive roll E, and the work W is fed in the direction indicated by the arrow. Further, in this case, the center tables B and the inner rolls D are usually set at the same level.

[Problems to be solved by the invention]

In the case of the above-mentioned material feeding mechanism by the conveyor belt method, it is most suitable when the thickness of the work W is regulated with the lower surface as a reference, but when only the surface of the work W is finish-polished regardless of the thickness unevenness, the center table is used. Since both B and the inner roll D are fixed, there is a problem that unevenness in the thickness of the work cannot be absorbed in the lower part, and there is a problem that it is impossible to finish polish only the complete surface.
Further, it is desirable that the final polishing process (light polishing) is carried out by feeding as fast as possible (100 m / min or more). However, there are restrictions due to mechanical conditions, about 60 m
/ Min was the highest. The restrictions include the following.

Since the above-mentioned center table, inner roll, etc. are fixed, not only the surface cannot be polished, but also the resistance due to the load on the contact roll and the center table portion becomes large and high-speed feed is impossible.

The surface of the center table is made of plain steel that is finish-polished or hard chrome plated, but at high speed feed, the backside of the conveyor belt and the surface of the center table are heavily worn, and the same conveyor belt or center I can't use the table.

As the speed of the wide conveyor belt increases, the lateral meandering becomes proportionally severe, and the meandering correction must be frequently performed in the conventional manual belt adjustment.
That is, in the case of high speed feeding, an automatic tracking mechanism for correcting the meandering of the conveyor belt is required.

As a method of using the wide belt sander, it is desirable to use a multi-purpose machine that can perform thickness control, finish polishing or coated surface polishing with one machine, and can easily perform the switching operation. The feed rate is also low (50 m / min or less) when the thickness is regulated, and as high as possible (100 m / min or more) during finish polishing to improve productivity.
There is an industry demand that it is desirable to perform the polishing operation in.

[Object of the Invention]

The present invention has been made in view of the above problems, and an object thereof is to control the thickness with one machine,
To provide a wide belt sander that can be used for finish polishing or coated surface polishing, and that can be easily switched between them.Furthermore, the feed speed during polishing work is low at the time of thickness regulation and high at the time of finish polishing, It is to provide a wide belt sander that can automatically correct meandering.

[Means for solving problems]

That is, in order to solve the above-mentioned problems, the present invention wraps a grinding belt between a contact roll and an idler roll and arranges a pressing shoe and a pinch roll before and after the contact roll, and the contact mechanism. A center table is arranged directly below the rolls, an inner roll is arranged directly below the pinch rolls, and a conveyor belt which conveys the center table and the inner rolls with their back surfaces in contact with each other is wound around the drive rolls and the driven rolls. In a wide belt sander for feeding a work to be processed with a lower mechanism, the center table is mounted on an air spring and the inner roll is mounted on and supported by an air cylinder so that pressure adjustment and vertical displacement are possible. The pressing shoe is pivotally attached to the frame and is free from both ends. A shaft with a certain fixed length in the vicinity is passed through the shoe boss and supported by being framed on the frame, and the end of this shaft can be adjusted so that the grinding allowance of the work is constant so that it does not rotate on the frame. Characterized in that it is fixed by metal fittings, the conveyor belt, a male screw rod threaded through one end of the shaft of the driven roll, a rotation drive device of the male screw rod, and the shaft of the driven roll. A male threaded rod for tensioning the conveyor belt, which is threadedly penetrated at the other end, and a rotational drive of the male threaded rod, which is arranged inwardly on both sides of the conveyor belt and is shielded by the conveyor belt in either forward or reverse direction. A photoelectric switch for activating the device, and an emergency photoelectric switch for stopping the conveyor belt driving device, which is arranged outside the photoelectric switches and is shielded by the conveyor belt. Characterized in that a Yaberuto automatic tracking device.

[Action]

In the above means, the center table and the inner roll are fixed by adjusting the air pressure,
It can be made to float. That is, if the air pressure of the air mount or the air cylinder is set to a high pressure, the inner roll and the center table are fixed, and it becomes possible to regulate the thickness based on the lower side. Further, if the air pressure of the air mount or the air cylinder is set to a low pressure, the center table and the inner roll will be in a floating state, and polishing based on the upper side will be possible. Therefore, it is possible to perform the finish polishing process on the basis of the upper surface even for the processed material having the uneven thickness.

In another means, when the shaft passing through the pressing shoe is loosened by rotating the stopper and the shaft is rotated to a certain extent, the fixing part of the shaft with the pressing shoe is a cam, so the pressing shoe moves up and down a little. It is possible to change the machining allowance, and this work can be performed easily from the operating side.

In the next means, when the conveyor belt is biased to the left or right to block the light of the photoelectric switch, the driving device is actuated to rotate the male screw rod screwed to the shaft of the driven roll to rotate the shaft of the driven roll. It swings and operates to return the conveyor belt to its original position.

Since the photoelectric switches are installed on the left and right sides, this operation is automatically performed and the conveyor belt always conveys the work material in the normal position. If the light from the emergency photoelectric switch is blocked, the machine itself will stop.

〔Example〕

Specific embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view of a wide belt sander according to the present invention viewed from a side surface. In this figure, 1 and 2 and 3 are contact rolls, 4 is an idler roll, and 5 is a grinding belt wound between the contact roll and the idler roll. Reference numeral 6 is a pinch roll for pressing the work, and 7 is a pressing shoe for setting a grinding allowance (working allowance) and pressing the work, which is of a cam type as described later. Reference numeral 8 is an inner roll, and 9 is an air cylinder. Further, 10 is a center table, the surface of which is fixed with a ceramic plate or sprayed with ceramic particles in order to reduce the friction coefficient. The lower portion of the center table 10 is reinforced with ribs 10A. Reference numeral 11 is an air mount of an air spring. A plurality of inner rolls 8, air cylinders 9, center tables 10, air mounts 11 and the like are respectively arranged, but the pressures are adjusted by piping with a precision pressure reducing valve, an air manifold, an air pipe line, etc., which will be described later. ing. That is, the inner roll 8 is a floating type that can move up and down by the air cylinder 9, and the center table 10 can move up and down by the air mount 11.

Next, the details will be described. Fig. 2 shows a floating type inner roll 8 and center table 1.
FIG. 3 is a plan view of the feed conveyor unit in which 0s and the like are arranged, and FIG. 3 is a sectional view taken along the line AA of FIG. 2 (however, a part of the configuration is omitted).

Reference numeral 12 is a mounting base of the air mount 11 made of L-shaped steel or the like, which is fixed to the frames 60 and 61 on both sides by erection. A base plate 13 for mounting the air mount 11 on the upper portions of both ends of the mounting base 12 of the air mount 11
Is fixed. Further, the air cylinder mounting base 14 and the other air cylinder mounting base 15 are arranged at predetermined intervals on the frames 60 and 61.
It is erected and fixed between and. The air cylinder 9 is placed on the air cylinder mounting bases 14 and 15, and the spindle 9A of the air cylinder 9 and the shaft 8A of the inner roll 8 are connected to the pivot arm 16 at the end of the shaft 8A. It is connected by being inserted. Further, the pivot arm 16 is pivotally attached to a shaft 17 attached to the frame 60. In this way, the inner roll 8 can be moved up and down as the spindle 9A of the air cylinder 9 is moved up and down. Incidentally, the pivot arm 16
Has a structure in which the upper limit position of the inner roll 8 can be adjusted by the bolt 18A of the stopper 18.

FIG. 4 shows the inner roll 8 and the center table 1.
FIG. 5 is a plan view of the air piping to 0, and FIG.
FIG. 6 is a sectional view taken along arrow B. In these figures, 20A, 20B,
20C, 20D, 20E, 20F, and 20G are air manifolds, which are fixed to the side surfaces of the air cylinder mounting table 15 which is erected and fixed to the frames 60 and 61 (see FIG. 3).

Reference numeral 23 is a panel equipped with pressure gauges 21A, 21B, 21C and 21D and precision pressure reducing valves 22A, 22B, 22C and 22D. In the case of the illustrated example, a pressure gauge 21D and a precision pressure reducing valve 22D
Is for the inner roll 8 and includes pressure gauges 21A, 21B,
21C and the precision pressure reducing valves 22A, 22B and 22C are for the center table 10. Also air manifold 20B
, 20D and 20E are for the center table 10, and the air manifolds 20A, 20C and 20F are for the air cylinder 9. Then, the air manifold 20G is changed from the precision pressure reducing valve 22D to the air manifolds 20A and 20A.
An air manifold for relay to distribute air to C and 20F. Lines 24 and the like indicated by alternate long and short dash lines indicate pipelines that connect these air manifolds to the air mount 11, the air cylinder 9, and the like.

Then, if the air pressure of the air cylinder 9, the air mount 11, etc. is made high, the inner roll 8 and the center table 10 are fixed, and the thickness regulation based on the lower side becomes possible. Further, if the air pressure of the air cylinder 9 and the air mount 11 is set to a low pressure, the inner roll 8
And the center table 10 is in a floating state,
Polishing with the upper side as a reference becomes possible. Then, in this floating state, it is possible to set a polishing allowance by adjusting a cam type pressing shoe 7 to be described later so that unevenness in the thickness of the work can escape to the conveyor 70 side for finish polishing.

Next, install the pinch rolls and the cam type pressing shoe 7
The setting of the polishing allowance will be described. FIG. 6 is a partially detailed plan view of a portion where the pinch roll 6 and the cam type pressing shoe 7 of FIG. 1 are installed, and FIG. 7 is a side view thereof. In these drawings, reference numeral 30 denotes a fixing metal fitting, which is fixed to the frames 60 and 61, and a metal fitting 31 is fixed to the upper portion of the fixing metal fitting 30. A bolt 32, which is screwed to the end of the shaft 6A of the pinch roll 6 at its lower end, is suspended from the metal fitting 31, and the bolt 32 has a coil spring so as to absorb the impact acting on the pinch roll 6 from the work. 33 is attached.

Both ends of the pressing shoe 7 are pin 39 to a metal fitting 40 pivotally attached to the fixing metal fitting 30 at one end by a pin 41.
It is fixed at.

The end of the pinch roll shaft 6A is fitted into the metal fitting 34, and the metal fitting 34 is pivotally attached to the pin 35 attached to the fixing metal fitting 30. The pressing shoe 7 has a shaft 37 penetrating therethrough and a frame 60, 61. A fixed length near both ends of the shaft 37 is formed as cams 37B and 37B, and fixed by bolts or the like so as not to move left and right while passing through the shoe boss portion 38. The end 37A of the cam 37B has a rotation stopper 42
It is fixed so that the grinding allowance of the work is constant. That is, when setting the grinding allowance, the rotation stopper 42 is loosened and the outer end portion 37A of the shaft is rotated by a spanner or the like to change the contact surface of the shoe 7 with the work. Although the pressing shoe 7 has been described as the pressing shoe 7 arranged before and after the contact roll 1, the other pressing shoes have the same mechanism.

Next, a conveyor belt automatic tracking device for correcting the meandering of the conveyor belt 70 will be described.

FIG. 8 is a plan view showing the installation position of the photoelectric switch of the conveyor belt automatic tracking device, and FIG. 9 is a detailed view of the automatic tracking device. That is, the photoelectric switches of the automatic tracking device are installed at positions P1 and P2 in the vicinity of both sides of the conveyor belt 70 at the front of the material feeding surface, and the photoelectric switches L1 and L3 are placed at the position P1 in the figure and P2. The photoelectric switches L2 and L4 are placed at the position.

Note that other sensor switches may be used instead of these photoelectric switches L1 to L4.

In this figure, L1 and L2 are photoelectric switches installed on the outer side of the end of the conveyor belt 70, and L3 and L4 are photoelectric switches installed on the inner side. Reference numeral 45 denotes a male screw rod for automatic tracking drive which is threadedly penetrated into the end of the shaft 72A of the conveyor belt driven roll 72, and a sprocket 46 for rotating the male screw rod 45 is fitted to the end. Has been done. Further, 47 is the conveyor belt 70.
Is a male screw rod for tensioning a conveyor belt, which is screwed through the other end of the shaft 72A of the driven roll.

FIG. 10 shows the male screw rod 45 for the automatic tracking drive.
FIG. 11 is a plan view of a drive device for rotating the motor, and FIG. 11 is a front view thereof.

In these figures, 48 is a gear motor, 49 is the gear motor 4
8 is a sprocket fitted to the drive shaft, and 50 is a chain engaged with the sprocket 46 and the sprocket 49.

The automatic tracking device configured as described above operates as follows.

The photoelectric switch L3 installed on both sides of the conveyor belt 70 while being offset to the left or right during operation.
Alternatively, when the beam of L4 is shielded, the conveyor belt tracking gear motor 48 is started, the male screw rod 45 is rotated, and the shaft 72 of the driven roll of the conveyor belt 70 is rotated.
A is swung back and forth to move the conveyor belt 70 back toward the center. By the operation of this tracking device, the conveyor belt 70 moves toward the center and the end of the conveyor belt 70 deviates from the beam of the photoelectric switch L3 or L4, and after the time set by the timer (for example, 0.5 seconds) elapses, the conveyor is moved. Belt tracking gear motor 4
8 stops.

Further, the conveyor belt 70 continues to move even after the gear motor 48 stops, and the photoelectric switch L3 or L4 on the opposite side continues.
When the state in which the shield is closed continues, the gear motor 48 is reversely started this time, and operates so as to return the conveyor belt 70 to the original direction.

During operation, the automatic tracking device repeats the above-mentioned operations, so that the conveyor belt 70 can always continue feeding at a normal position. When the conveyor belt 70 is abnormally biased due to some trouble or malfunction of the tracking device, the conveyor belt 70 is stopped by the emergency photoelectric switches L1 and L2 outside the tracking photoelectric switch L3 or L4. It has become.

〔The invention's effect〕

The wide belt sander according to the present invention configured as described above is (1) both center table and inner roll are of a flow-teg type by adjusting air pressure, and therefore can be used as a lower reference or an upper reference. It is possible. Therefore, both polishing that regulates the thickness of the work and finish polishing of only the surface that is not related to uneven thickness of the work are possible.

(2) Since the center table surface is made of a ceramic material with a low friction coefficient and is a floating type, it is possible to feed workpieces at a high speed of up to 150 m / m.
It is possible up to in. Therefore, work efficiency is significantly improved.

(3) Since the material pressing shoes arranged before and after the contact roll are of the cam type, the stock removal allowance can be set from the operating side.

(4) Since the automatic tracking device that can automatically correct the meandering of the conveyor belt is provided, it is not necessary to stop and adjust the machine when the meandering occurs as in the conventional system, so the operating efficiency is improved. Get better.

It has an excellent peculiar effect such as.

[Brief description of drawings]

FIG. 1 is a schematic view of a wide belt sander according to the present invention as seen from a side surface, FIG. 2 is a plan view of a material feeding unit in which a floating type inner roll, a center table and the like are arranged, and FIG. FIG. 2 is a sectional view taken along the line AA of FIG. FIG. 4 is a plan view of air piping to the inner roll and the center table, and FIG. 5 is a sectional view taken along the line BB of FIG. FIG. 6 is a partially detailed plan view of a portion where the pinch roll and the cam type shoe of FIG. 1 are installed, and FIG. 7 is a side view thereof. FIG. 8 shows the installation position of the photoelectric switch of the conveyor belt automatic tracking device, and FIG. 9 shows the details of this automatic tracking device.
FIG. 10 is a plan view of a drive device for rotating the male screw rod for automatic tracking drive, and FIG. 11 is a front view thereof. FIG. 12 is a schematic side view of a material feeding mechanism of a conventional wide belt sander. 1, 2, 3 ... Contact roll 4 ... Idler roll, 5 ... Grinding belt 6 ... Pinch roll, 7 ... Holding shoe 8 ... Inner roll, 9 ... Air cylinder 10 ... Center table, 11 ... … Air mount 12 …… Air mount stand 15 …… Flat cylinder stand 16 …… Pivot arm 20A to 20G …… Air manifold 21A to 21D …… Pressure gauge 22A to 22D …… Precision decompression valve 24 …… Piping pipe 30 ... Fixing metal fitting, 31,40 ... Metal fitting 37 ... Shaft, 38 ... Shoe boss 39,41 ... Pin 42 ... Rotation stop fitting, 45 ... Male screw rod 47 ... Male screw for conveyor belt tension Rod 48 ... Drive gear motor, 50 ... Chain L1, L2, L3, L4 ... Photoelectric switch 60, 61 ... Frame 70 ...... Conveyor belt 71 ...... Conveyor belt driving roll 72 ...... Conveyor belt driven roll 72 A …… Conveyor belt driven roll shaft

Claims (3)

[Claims] 1. An upper mechanism in which a grinding belt is wound between a contact roll and an idler roll and a pressing shoe and a pinch roll are arranged in front of and behind the contact roll, and a center table is arranged directly below the contact roll. An inner roll is disposed directly below the pinch roll, and a conveyor belt for transporting the center table and the inner roll by contacting the back surface with the lower roll is wound around the drive roll and the driven roll. A wide belt sander for feeding a work), wherein the center table is mounted on and supported by an air spring, and the inner roll is mounted by an air cylinder so as to be capable of pressure adjustment and vertical displacement. . 2. An upper mechanism in which a grinding belt is wound between a contact roll and an idler roll and a pressing shoe and a pinch roll are arranged in front of and behind the contact roll, and a center table is arranged directly below the contact roll. An inner roll is arranged directly below the pinch roll, and a work piece is provided between the center table and the inner roll, and a conveyor belt which conveys the inner roll to the lower roll, which is wound around the drive roll and the driven roll. In a wide belt sander for feeding material, the pressing shoe is rotatably pivotally attached to a frame, and a shaft having cams having a fixed length near both ends is passed through a shoe boss to support the frame by axially mounting it. Furthermore, the end of the shaft is fixed to the frame with a rotation stopper so that the grinding allowance of the work is constant. Wide belt sanders featuring and. 3. An upper mechanism in which a grinding belt is wound between a contact roll and an idler roll, a pressing shoe and a pinch roll are arranged in front of and behind the contact roll, and a center table is arranged directly below the contact roll. An inner roll is arranged directly below the pinch roll, and a work piece is provided between the center table and the inner roll, and a conveyor belt which conveys the inner roll to the lower roll, which is wound around the drive roll and the driven roll. In a wide belt sander for feeding material, the conveyor belt has a male screw rod threadedly penetrated through one end of a shaft of a driven roll, a rotation drive device for the male screw rod, and the other of the shafts of the driven roll. And a male screw rod for tensioning the conveyor belt, which is threadedly penetrated at the end of the conveyor belt, and the inside of the conveyor belt near both sides of the conveyor belt. A photoelectric switch for operating the rotation drive device of the male screw rod in either the forward or reverse direction when the beer belt shields it, and an emergency switch for stopping the conveyor belt drive device which is disposed outside each of the photoelectric switches and when the conveyor belt shields it. Wide belt sander equipped with a photoelectric switch and a conveyor belt automatic tracking device.