JP2608205B2 - Belt sander machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt sander having an improved structure of a treading device.

[0002]

2. Description of the Related Art In a belt sander machine, an endless sanding belt is laid between a plurality of rolls so that its polishing surface is on the outside, and a treading device is arranged on the inner peripheral side of the sanding belt for running. The sanding belt is pressed against the work by a treading device to perform polishing. Conventionally, the treading pad surface of the treading device has been generally formed flat.

[0003]

However, in the belt sander machine having the above structure, when an attempt is made to grind a curved work whose surface to be ground is, for example, a large bulge, the tread pad surface of the treading device. Is flat, so that the sanding belt is pressed only to the uppermost part of the convex surface of the work. This means that local overpolishing occurs only on the uppermost part of the convex surface, so that uniform polishing of the entire work becomes difficult.

In order to cope with such a situation, as described in Japanese Patent Publication No. 61-46265, for example, a swinging device for swinging the work to the left and right with respect to the sanding belt is provided, so that a polishing surface of the work is provided. There is also an example in which the entire area is contacted with the sanding belt.

[0005] However, in this case, a work having a convex polished surface can be polished, but a work having a concave polished surface cannot be polished.

Therefore, an object of the present invention is to enable uniform polishing of a work having a large curved surface without causing local overpolishing, and also for uniform polishing regardless of the shape of the polishing surface. To provide a belt sander machine.

[0007]

SUMMARY OF THE INVENTION A belt sander according to the present invention comprises a main frame, a work transfer device for feeding a work in a predetermined direction with its polished surface facing upward, and a plurality of rolls provided on the main frame. An endless sanding belt that is stretched and travels in a direction transverse to the work conveyance direction, and a stepping device that is provided on the main frame on the inner peripheral side of the sanding belt and presses the traveling sanding belt against the work. The stepping device is provided with a plurality of divided pads arranged along the running direction of the sanding belt, and an elevating mechanism for independently moving these divided pads up and down is connected to each divided pad. And moving each divided pad group to a height position corresponding to each portion of the polished surface of the work by each lifting mechanism, and then fixing the divided pad group to that position. A locking mechanism that is provided, further, the main frame side having characterized in that provided support roller for receiving from the opposite side of the treading apparatus sanding belt at both ends outside the workpiece (the invention of claim 1).

According to the first aspect of the present invention, the driving belt is formed in a double belt type having an endless driving belt provided on the inner peripheral side of the sanding belt, and the stepping device is pressed into the driving belt so as to press the driving belt against the sanding belt. It can be arranged on the circumferential side (the invention of claim 2).

Further, in the case of the configuration of the second aspect,
A split pad can be constituted by an upper roller and a lower roller sandwiching both sides of the drive belt (the invention of claim 3).

[0010]

According to the first aspect of the present invention, when the sanding belt is pressed against the work by the treading device while the sanding belt stretched between the rolls is run, the work is polished. In this case, the stepping device is provided with a plurality of divided pads arranged along the running direction of the sanding belt, and the divided pad is locked after being moved to a height position corresponding to each part of the polishing surface of the work. Since the divided pad group is locked by the mechanism, the divided pad group is arranged at a height position corresponding to each portion of the polishing surface of the work along the running direction of the sanding belt. Therefore, as a whole, the treading device is formed in a shape that conforms to the uneven shape of the polishing surface of the work, and as a result, the sanding belt is uniformly pressed on the entire polishing surface of the work by the treading device. Become.

Further, a support roller for supporting the sanding belt from the opposite side of the stepping device is provided on the outer side of both ends of the work on the main frame side. Therefore, even if the polishing surface of the work is concave and both ends of the work are higher than the center, the sanding belt is supported by the support rollers at both ends of the work, The tension applied prevents the belt from hitting the end of the work excessively strongly.

According to the second aspect of the present invention, if the drive belt is provided on the inner peripheral side of the sanding belt and the treading device is used to press the drive belt against the sanding belt, the sanding belt is rubbed. It follows that it will follow the drive belt. In this case, since the tension acting on the sanding belt is reduced as compared with a configuration in which the sanding belt is directly driven, the sanding belt travels while being flexibly deformed.

Further, in addition to the double belt system as described above, if the split pad is provided with the upper roller and the lower roller sandwiching both sides of the drive belt as in the invention of claim 3, the drive belt is Since the vehicle runs without separating from the split pad, it is possible to prevent local overpolishing of the work due to the force acting on the drive belt in the direction in which the drive belt separates from the pedaling device due to the tension acting on the drive belt.

[0014]

The effects of the present invention are as follows.

According to the first aspect of the present invention, since the divided pad group of the treading device can be formed into a shape conforming to the shape of the polishing surface of the work, the sanding belt can be pressed uniformly over the entire polishing surface of the work. Therefore, even a work having a curved polishing surface can be polished without causing local excessive polishing. Also, the shape of the polished surface may be a shape having a convex upper surface or a shape having a concave upper surface. In addition, since the supporting rollers support the sanding belt at the outer sides of both ends of the work, even if the ends of the work are higher than the center, the belt is excessively applied to the end of the work due to the tension applied to the sanding belt. And the so-called "edge dripping" phenomenon can be prevented.

According to the second aspect of the present invention, the tension of the sanding belt can be further reduced, so that the convex portion of the polishing surface which is convex upward and the end portion of the polishing surface which is concave downward. It becomes possible to prevent excessive polishing in.

According to the third aspect of the invention, since the drive belt runs without separating from the split pad, the sanding belt is pressed against the work by the tension acting on the drive belt, and local overpolishing occurs there. It can be prevented from occurring.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

(Structure) As shown in FIGS. 1 and 2, the main frame 11 has a T-shape that spreads to the left and right above a rectangular base, and an opening 11a is formed in the upper part of the base. I have. Opening 11a of main frame 11
The drive roll 12 and the driven roll 1 are located at the left and right positions sandwiching the
3 are provided as a pair, and an endless drive belt 14 is stretched between both rolls 12 and 13. As shown in FIG. 3, the drive belt 14 has a structure in which an elastic material 14b such as a sponge is superposed on a belt base material 14a.
Of the elastic material 14b is narrower than the belt base material 14a, as is apparent from FIG.

The main frame 11 is provided with a pair of a driving roll 15 and a driven roll 16 at positions outside the driving roll 12 and the driven roll 13.
A sanding belt 18 is wound between the rolls 15 and 16 and the guide roll 17 provided on the main frame 11 with the polished surface outside, and the sanding belt 18 is positioned outside the drive belt 14. It has a double belt structure.

The driven rolls 13 and 16 located on the left side of the front of the main frame 11 are supported by the main frame 11 so that the bearings for receiving the shafts of the driven rolls 13 and 16 can move in the left and right directions, and the bearings thereof. Are driven left and right by an air cylinder (not shown). Thus, the tension of both belts 14, 18 can be freely adjusted by driving the air cylinder.

As shown in FIG. 3, the drive rolls 12, 15 are provided with drive motors 19, fixed to the main frame 11,
The drive belt 14 and the sanding belt 18 can run simultaneously by being directly connected to the drive motor 20 and operating the drive motors 19 and 20.

A work transfer device 30 for fixing and transferring the work W is provided on the base of the main frame 11, and the sanding belt 18 is provided on the inner peripheral side of the drive belt 14 of the main frame 11. The above work W
There is provided a treading device 70 for pressing against, and a supporting roller mechanism 100 for supporting the sanding belt 18 from the side opposite to the treading device 70 on the main frame 11 side. These are controlled by an external control panel 200. Is done. Next, these will be described in detail.

<Work transfer device 30> Work transfer device 3
0 is shown in detail in FIGS. 4 to 8, and its base 31 is supported by legs 32 and installed in the base portion of the main frame 11 as shown in FIG. A vertical position adjustment mechanism 36 including an operation handle 33, a bevel gear 34, a connection shaft 35, and the like is provided here. By rotating the operation handle 33, the height position of the base 31 can be freely adjusted.

Two pairs are formed on the left and right sides of the upper surface of the base 31.
Book guide rails 37 are attached in parallel, and a slide table 38 is arranged on the guide rails 37 so as to be movable back and forth via rail receivers 39. And base 3
1 includes a reversible feed motor 40 and a deceleration transmission mechanism 4 including sprockets 41, 42 and a chain 43.
4 is provided, and a pinion gear 45 is attached to an output shaft of the speed reduction transmission mechanism 44. On the other hand, a rack 46 that meshes with the pinion gear 45 is fixed to the lower surface of the slide table 38, so that the feed motor 4
0 drives the slide table 38 to the guide rail 37
Can be moved back and forth (in the directions of arrows A and B in FIGS. 5 and 6).

As shown in FIG. 5, a pair of support walls 47 are erected on the front and rear sides of the upper surface of the slide table 38 so as to face each other. I have. A bearing 49 is fitted to the guide bar 48, and a support table 50 is attached to the bearing 49, so that the support table 50 can move back and forth along the guide bar 48.

A vibration motor 51 (see FIG. 6) is fixed near one support wall 47 of the slide table 38, and a cam disk 52 is mounted on a rotation shaft of the vibration motor 51, and A crank pin 53 protrudes from an eccentric position of the disk 52. The swing rod 5 is provided between the crank pin 53 and the support table 50.
When the vibration motor 51 is operated, the cam disk 52 rotates, and the support table 50 can be vibrated on the slide table 38 back and forth (in the direction in which the workpiece is fed) at a high speed.

A pair of guide rails 55 project from the upper surface of the support table 50 so as to extend in the left-right direction (see FIG. 6). The guide rail 55 extends in the front-rear direction.
A book bridge block 56 is bridged in an engaged state, and is movable left and right along the guide rail 55. On the other hand, a reversible position adjusting motor 57 is fixed to the right side of the support table 50, and a drive shaft 58 extending in the left-right direction is connected to a rotation shaft thereof. The right half region and the left half region of the drive shaft 58 are threaded in opposite directions, and the threaded portions are threaded through the two bridge blocks 56. Therefore, when the position adjusting motor 57 is rotated, each bridge block 56 moves in the opposite direction along the guide rail 55,
As a result, the distance between the bridge blocks 56 can be adjusted.

As shown in FIG. 7, each bridge block 5
At both front and rear ends of the mounting member 6, mounting pieces 56 a protrude, and stud bolts 59 are attached to the mounting pieces 56 a so as to extend vertically, and a shaft receiving member 60 is fixed to an upper end of the stud bolt 59. Stud bolt 59
The shaft receiving members 60 are located at the front and rear ends of the bridge block 56 so as to be opposed to the front and rear ends thereof. 7 and is rotatable around bolts 62 in the directions of arrows C and D in FIG.

The suction unit 61 has an air suction passage 61a formed therein, which communicates with a vacuum pump (not shown). The air suction passage 61a is connected to a circular opening 63a of a suction plate 63 superposed on the upper surface of the suction unit 61. It is connected. Further, an elastic plate 64 having an opening 64a connected to the circular opening 63a is laminated and attached on the upper surface of the suction plate 63, and the work W to be polished is placed on the suction unit 61 and a vacuum pump is installed. When actuated, the suction unit 61 sucks the work W while rotating according to the curvature of the lower surface of the work W as shown in FIG. 7, thereby fixing the work W on the support table 50.

As schematically shown in FIG. 8, a position detecting piece 65 is provided on the slide table 38 so as to protrude to the side, and moves together with the slide table 38. On the base 31 side of the main frame 11, three proximity switches 6
6 to 68 are provided. The first proximity switch 66 switches when the slide table 38 is at the home position, facing the position detection piece 65, and the second proximity switch 67 causes the slide table 38 to move from the home position and sand the workpiece W. When entering the lower region of the belt 18, switching is performed in opposition to the position detecting piece 65, and the third proximity switch 68 moves to the position detecting piece 65 when the work W moves until it separates from the lower region of the sanding belt 18. Switching is performed facing each other. <Treading Device 70> Next, the treading device 70 will be described.
First, this corresponds to a plurality (30 in this embodiment) of divided pads 71 arranged in the running direction of the sanding belt 18 and an elevating mechanism for vertically moving each divided pad 71 independently. Same number of pad cylinders 72
And these are assembled together in the sub-frame 73. It should be noted that each division pad 71 is numbered 1 to 30 in order from the end.

Now, as shown in FIG. 9 which is a rear view of the sub-frame 73, a pair of left and right support angles 7 are provided.
4, a guide block 75 provided so as to be bridged between the support angles 74, and a cylinder mounting member 76 located above the guide block 75 and bridged between the support angles 74. Of these, the supporting angle 74 is vertically guided by a pair of linear guides 77 provided on both the left and right sides of the main frame 11 as shown in FIG.
It is supported so that it can move up and down. FIGS. 9 and 10 show a supporting roller mechanism 100 which will be described later, detached to simplify the drawings.

A pair of mounting posts 78 are erected on the upper portion of the main frame 11 and a frame cylinder 79 is provided here.
Is attached. The rod 80 of the frame cylinder 79 is connected to the upper end of the support angle 74 of the sub-frame 73 via a joint 80a as shown in FIG. 10, and the sub-frame 73 is moved up and down by operating the frame cylinder 79. Can be driven.

Cylinder mounting member 76 of sub-frame 73
A total of 30 pad cylinders 72 are attached in a staggered arrangement to each rod 72a, as shown in FIG.
Extends downward. These pad cylinders 72
Is a type provided with a brake mechanism 81 capable of locking the rod 72a at an arbitrary position, and as will be apparent from the later description, the brake mechanism 8
1 functions as a lock mechanism that fixes each divided pad 71 at a required height position. The brake mechanism 81
When compressed air is supplied to a predetermined port (not shown), the brake piston moves to release the restraint of the rod 72a, and when the air is discharged, the tightening ring tightens the rod 72a by the spring force to restrain the movement of the rod 72a. Therefore, the illustration of the internal structure is omitted for simplification of the drawing.

Now, the rod 7 of each pad cylinder 72
A connecting plate 82 is fixed to the lower end of 2a, and two guide rods 83 are fixed to the connecting plate 82 downward. The guide rod 83 penetrates the guide block 75 vertically and protrudes downward, and a connecting block 84 is attached to a protruding end thereof. The connecting block 84 projects forward of the main frame 11 so as to pass through the opening 11a of the main frame 11, and a buffer air cylinder 85 to which constant-pressure air is constantly supplied is attached to the front projecting end thereof. Have been.

Two rods 85a project downward from the cushioning air cylinder 85, and a roller support frame 86 is attached to the lower end thereof. An upper roller 87 is rotatably provided between the front and rear end plates 86a of the roller support frame 86, and a lower roller 88 is rotatably provided in a cantilever state on each of the front and rear end plates 86a. Each lower roller 88 has a smaller diameter than the upper roller 87.
It is short and supports both sides of the belt base material 14a of the drive belt 14 as shown in FIG. As a result, in the drive belt 14, both side portions of the belt base material 14a are sandwiched by the upper and lower rollers 87 and 88, and the rollers 87 and 8 are
8 and thus are held by each divided pad 71.

As shown in FIGS. 12 and 13, one of the group of 30 divided pads 71 arranged at both left and right ends has a cushioning air cylinder 85 interposed at the front end of the connecting block 84, as shown in FIGS. Roller support frame 86 directly
Is attached, a pressing roller 89 having a large diameter is provided here, and a lower roller 88 like the other split pad 71 is not provided on the lower side.

<Supporting Roller Mechanism 100> On the other hand, a sub-frame 73 movably provided on the main frame 11 has
A supporting roller mechanism 100 as shown in FIGS. 11 and 14 is provided, and its configuration is as follows.

That is, a horizontally long guide plate 101 is fixed to the back of the guide block 75 constituting the sub-frame 73 so as to extend to the full width of the guide block 75, and two upper and lower guide grooves 102 are formed therein. Have been. Two left and right slide plates 103 are attached to the guide plate 101, and the upper and lower guide protrusions 104 protruding from the front surface thereof are fitted into the guide grooves 102 of the guide plate 101, so that the guide plate 101 is fitted. It is movable to the left and right.

Left and right drive motors 106 are attached to both left and right end portions of the guide plate 101 via mounting plates 105, respectively, and a drive shaft 107 connected to a rotation shaft thereof is provided to extend in a horizontal direction. This drive shaft 107
The left and right slide plates are formed with screw grooves, which are screwed into female screw portions (not shown) formed on the left and right slide plates 103. The 103 can be moved to the left and right desired positions.

A vertical slide plate 108 is attached to each of the left and right slide plates 103. Although not shown, the upper and lower slide plates 108 are also the left and right slide plates 1.
It is supported so as to be vertically movable with respect to 03. A vertical drive motor 110 is provided on the upper ends of the left and right slide plates 103 via a mounting plate 109, and a drive shaft 111 connected to the rotation shaft of the vertical drive motor 110 extends laterally. The drive shaft 111 is formed with a thread groove, which is screwed into a female screw portion (not shown) formed on the upper and lower slide plate 108. The vertical slide plate 108 can be moved to a desired vertical position.

A support shaft 112 is fixed to a lower end portion of each upper and lower slide plate 108 by a nut 113, and a tip end of the support shaft 112 extends below the split pad 71 group. A support roller 114 is rotatably provided at the tip of the support shaft 111, and is positioned so as to receive and support the sanding belt 18 from the lower side opposite to the division pad 71 group.

<Control Panel 200> FIG. 15 shows an operation panel of the control panel 200 for controlling each of the above-described mechanisms.

Although not shown, the control panel 200 includes
The drive motor 19 for driving the belts 14 and 18 described above,
The inverter 20 for operating the motor 20 at a variable speed by frequency control is built in, and the output frequency of the inverter 20 and the running speed of each belt 14, 18 can be adjusted by knobs 201, 202. Note that reference numerals 203 and 20
Reference numeral 4 denotes a start switch for the drive motors 19 and 20;
Reference numerals 5 and 206 denote stop switches for the drive motors 19 and 20.

The operation panel of the control panel 200 includes a sub-frame elevating switch 207 for operating a frame cylinder 79 for vertically moving the sub-frame 73, a forming switch 208 for the divided pad 71 group, and a four-digit digital switch 209. Also, a changeover switch 210 for the automatic lifting function of the subframe 73 is provided.

When the forming switch 208 is set to the "forming" position, the rod 72a of each pad cylinder 72 corresponding to the divided pad 71 in the range selected by the digital switch 209 is lowered, and " When set to the "locked" position, the brake mechanisms 81 of all the pad cylinders 72 are actuated, and the rods 72a are locked in that position. The upper two digits of the numerical value set in the digital switch 209 are treated as the lower limit number of the operation range of the divided pad 71 group, and the lower two digits thereof are treated as the upper limit number.

On the other hand, the operation panel of the control panel 200 has a shape input switch 211 and a down pattern selection switch 21.
2 is also provided. The shape input switch 211 is for inputting whether the polishing surface of the work W is convex upward or concave downward, and the descending pattern selection switch 212 is mainly used for the division pad 71 group. This is used to select the descending pattern, and is set to 3 for "1", "2", and "3".
There is a position.

Here, the descending pattern selection switch 212
Is set to the position “1”, the “fall pattern I” is set. This “falling pattern I” is used when the group of divided pads 71 within the range set by the digital switch 209 is lowered.
And the operation of forcibly lowering the compressed air by air pressure. Further, when the descending pattern selection switch 212 is set to the position "2", the "descending pattern II" is set. This "descent pattern II" refers to an operation in which the pad cylinder 72 within the set range is opened and the divided pad 71 group is lowered by its own weight.

FIG. 16 conceptually shows how an actual group of divided pads 71 descends according to a combination of two types of descending patterns and the shape of the work W. In the figure, those marked with "●" on the arrow (↓) are forcibly lowered by the pad cylinder 72, and those marked with "○" open the pad cylinder 72 and descend by their own weight. That is, the symbol "x" means that the pad cylinder 72 is locked.

These will be described in detail as follows. When the “downward pattern I” is selected and the switch 211 has input that the upper surface of the work W has a convex shape, the division within the set range is performed as shown in FIG. The pad group 71 is forcibly lowered by the pad cylinder 72, but the divided pad group 71 outside the range is lowered by its own weight. vice versa,
If the upper surface of the workpiece W is input as a concave shape by the switch 211 when the “falling pattern I” is selected, as shown in FIG. The 71 group is forcibly lowered by the pad cylinder 72, and the divided pad 71 groups outside the range remain locked. Further, when the “fall pattern II” is selected, the switch 21
When it is input by 1 that the upper surface of the work W has a convex shape, as shown in FIG. 7C, the group of divided pads 71 within the set range descends by its own weight, but outside the range. The divided pad 71 group is forcedly lowered by the pad cylinder 72. Conversely, if the switch 211 has input that the upper surface of the work W has a concave shape when the “falling pattern II” is selected, as shown in FIG. The divided pad 71 group of 1 descends by its own weight, and the divided pad 71 group outside the range remains locked.

Further, in the present embodiment, when the divided pads 71 are forcibly lowered by their own weight, all the divided pads 71 within the set range are not lowered all at once, but are first positioned at the center. The divided pad 71 is lowered, and each time a predetermined time (for example, 0.5 seconds) elapses, the adjacent divided pad 71 is sequentially lowered.
The reason is as follows. Temporarily, all the division pads 7
When the workpieces 1 are simultaneously lowered and the work W has a concave shape, as shown in FIG. 17 (A), first, the dividing pads 71 hit both ends of the work W and press the sanding belt 18 at that position. Will be. Then, the sanding belts 18 located between the split pads 71 on both sides of the work W are in a taut state, so that the split pads 71 located between them cannot be lowered, and eventually,
This is because the group of divided pads 71 does not line up along the shape of the polished surface of the work W. On the other hand, if the group of divided pads 71 is descended sequentially from the center with a time difference as in this embodiment, as shown in FIG.
Since the division pad 71 is also lowered to the lowermost part of the concave portion of the work W, the division pad 71 group comes to line up exactly along the shape of the work W. When the group of divided pads 71 is lowered, it is not necessarily lowered from the center as in the present embodiment, and, for example, as shown in FIG. It is also possible to lower the workpiece W in sequence from one point. Further, the optimum time difference for sequentially lowering each split pad 71 differs depending on the descending speed of the split pad 71 and the depth of the concave shape of the work W.
For this reason, in this embodiment, the time difference can be set by the digital switch 209 in milliseconds, and the set value is read when the descending pattern selection switch 212 is set to the position “3”. It has become.

The control panel 200 is provided with the same number of fine adjustment switches 220 corresponding to a total of 30 divided pads 71, and when these switches are operated from the neutral position to the ascending side position, the switches 220 are corresponding. Pad cylinder 7
When the pad 2 is moved up and operated to the lower position, the pad cylinder 72 is moved down.

On the other hand, the changeover switch 210 of the control panel 200
Is set to the “manual” position and the sub-frame up / down switch 207 is switched to the “down” position, the frame cylinder 79 operates to operate the sub-frame 7
3 moves down and switches to the "up" position, the frame cylinder 79 operates and the sub-frame 73 goes up. Further, when the changeover switch 210 is set to the "automatic" position, when the slide table 38 of the work transfer device 30 is at the origin position, the sub frame 73 is held at the raised position, and the slide table 38 is moved to the up position. When the second proximity switch 67 is moved to perform switching, the frame cylinder 79 is actuated based on the switching to lower the sub frame 73. Further, when the slide table 38 moves and the third proximity switch 68 switches, the frame cylinder 7
9 is activated to raise the sub-frame 73 again.

Further, the operation panel of the control panel 200 is provided with a support roller horizontal movement switch 215 and a support roller vertical movement switch 216. When the support roller left / right switch 215 is turned on, the support roller mechanism 10 is turned on.
The left / right drive motor 106 of 0 can be driven to move the left / right slide plate 103 to desired positions on the left and right.
When the support roller up / down movement switch 216 is turned on, the up / down drive motor 109 of the support roller mechanism 100 is driven to move the up / down slide plate 108 to a desired left / right position. The switch 217 provided on the operation panel is a full stop switch for emergency stop.

(Operation) Next, the operation of the present embodiment will be described.

<Molding Operation of the Treading Device 70> First, the work W is set on the suction unit 61 of the work transfer device 30 so that the polishing surface faces upward, and the vacuum pump (not shown) is operated to place the work W there. Adsorb. In this case, when the width dimension of the work W and the interval dimension between the two suction units 61 do not match, the suction unit 61 can be moved by rotating the position adjusting motor 57 of the work transfer device 30 forward or backward. . Further, depending on the shape of the work W, the angle between the upper surface of the suction unit 61 and the lower surface of the work W may not match, but in this case,
Since the suction unit 61 is rotatable about the bolt 62, the suction unit 61 can be rotated to bring the two into close contact.

Thereafter, the support roller left / right movement switch 215 of the control panel 200 and the support roller vertical movement switch 21
6 is operated to move both supporting rollers 114 to the lower portions on the left and right sides of the work W. Then, it is confirmed that the sub-frame 73 of the work W is at the raised position, the slide table 38 of the work transfer device 30 is moved, and the work W
Under the sanding belt 18. And
With the changeover switch 210 of the control panel 200 set to the “manual” position,
To the "down" position. Then, the frame cylinder 79 operates and the sub-frame 73 descends,
The group of division pads 71 approaches the work W. In this state, as shown in FIG. 1, the group of divided pads 71 of the treading device 70 remains in a substantially horizontal horizontal line.

Next, the numbers of the divided pads 71 corresponding to both ends of the work W are read, and the numbers are input to the digital switch 209 of the control panel 200. And the control panel 20
After setting the 0 shape input switch 211 and the descending pattern selection switch 212 to required positions, the forming switch 208 is operated to the "forming" side. Here, for convenience of explanation, the shape of the polishing surface of the work W is convex, “fall pattern I” is set as the descending pattern, and both ends of the work W correspond to the No. 6 and No. 25 split pads 71. Therefore, in the digital switch 209, “062
Assume that "5" has been entered.

Then, as conceptually shown in FIG. 16, compressed air is supplied to the pad cylinders 72 corresponding to the 6th to 25th divided pad 71 groups to force the divided pad 71 groups. No. 1 to 6 and 26
The air of the pad cylinders 72 corresponding to the No. 30 to No. 30 split pads 71 is released, and the split pad 71 groups descend by their own weight. When each split pad 71 descends,
While the drive belt 14 and the sanding belt 18 are sandwiched between the split pads 71, the split pads 71 come into contact with the work W and are prevented from further descending.
Stop at a height position corresponding to each part of the polished surface. For this reason, the division pads 71 are arranged along the shape of the polishing surface of the work W, and the drive belt 14 and the sanding belt 18 are also shaped according to the division pads 71 group. At this time, since the air cylinders that receive the bearings of the driven rolls 13 and 16 around which the drive belt 14 and the sanding belt 18 are stretched are also free to move air, both belts 14 can be freely moved. , 18 does not act to prevent the movement of each split pad 71. Thereafter, if necessary, the height position of the divided pad 71 can be finely adjusted by operating the fine adjustment switch 220 of the operation panel 200. As a result, the divided pads 71 group of the treading device 70 are formed according to the shape of the polished surface of the work W, and are formed into a shape that is convex downward.

Now, after confirming that the group of divided pads 71 are lined up along the polishing surface of the work W, the molding switch 2 is used.
08 is operated to the "lock" side. As a result, the brake mechanisms 81 of all the pad cylinders 72 are operated, so that the rods 72a of each cylinder 72 are locked in that position, each split pad 71 is held in its height position, and the molded shape is retained. To be done. At the same time, the air cylinder receiving the bearings of the driven rolls 13 and 16 around which the driving belt 14 and the sanding belt 18 are stretched is operated to tension the belts 14 and 18 to a predetermined tension. Even if tension is applied to both belts 14 and 18 in this way,
Since each pad cylinder 72 is already locked,
Each division pad 71 does not rise.

Next, the support roller left / right movement switch 215 of the control panel 200 and the support roller up / down movement switch 21
6 is operated to move the two support rollers 114 to the outside of the left and right ends of the work W, respectively, and raise them to a position where they support the sanding belt 18.

Thereafter, the sub-frame elevating switch 207
Is switched to the "up" position, the frame cylinder 79 operates to raise the sub-frame 73, and accordingly the group of divided pads 71 rises while maintaining the formed shape. Thus, the forming operation of the treading device 70 ends.

<Polishing Operation> To polish the work W, first, the slide table 38 of the work transfer device 30 is returned to the origin position, and the work W is set on the suction unit 61. When the changeover switch 210 of the control panel 200 is switched to the "automatic" position, the feed motor 40 of the work transfer device 30 shown in FIG.
5 rotates, and the slide table 38 starts to move toward the treading device 70 by the rack 46 meshing therewith.

As a result, when the work W reaches a position below the sanding belt 18, the second proximity switch 67 performs a switching operation. Based on this, the frame cylinder 79 operates to lower the sub-frame 73.
Then, the divided pads 7 arranged in the shape of the work W are arranged.
One group is in a state in which the drive belt 14 and the sanding belt 18 are overlapped and pressed on the entire area of the polished surface of the work W, and the respective belts 14 and 18 are in a state of being tensioned by a predetermined tension.

When the lowering of the sub-frame 73 is detected by a limit switch (not shown), the inverter device is started and the drive motors 19 and 20 are operated,
The drive belt 14 and the sanding belt 18 run. Here, the sanding belt 18 travels by directly receiving the driving force from the drive roll 12 rotated by the drive motor 20, but the elastic material 14 b of the drive belt 14 is provided on the inner peripheral side of the sanding belt 18 with the treading device 70. Therefore, the sanding belt 18 travels by receiving the driving force from the driving belt 14 as well.

When the sanding belt 18 travels in this manner, the polishing surface of the work W is sanded by the sanding belt 1.
8 polished. In this case, since the split pad 71 group of the pedaling device 70 is formed in a shape in which the lower side is convex corresponding to the shape of the polishing surface of the work W having a concave top, the sanding belt 18 is the polishing surface of the work W. It is evenly pressed to the entire area, and there is no risk of local overpolishing.

Moreover, on both sides of the work W, the left and right support rollers 114 receive the sanding belt 18 from below as shown in FIG. Therefore, even if there is a situation in which a tension acts on the sanding belt 18 and a force that strongly pushes down the end portion of the work W acts on the sanding belt 18, the force is received by the support roller 114, so that the belt 18 is prevented from pressing against the end of the work W.

Further, in the work transfer device 30, the vibration motor 51 is rotated, the cam disk 52 is rotated, and the support table 50 is vibrated back and forth via the swing rod 54. Therefore, the work W is also sanded by the sanding belt 18. It vibrates back and forth (feed direction) while being polished by. Further, since the feed motor 40 is continuously driven on the base 31, the slide table 38 and thus the work W is gradually moved to the back, and even if the work W is narrower than the sanding belt 18, the polishing surface The whole area will be polished.

Thereafter, the slide table 38 is further moved to the rear, and the position detecting piece 65 is moved to the third proximity switch 68.
, The inverter device of the control panel 200 stops, the operation of the drive motors 19 and 20 stops, and the drive belt 14 and the sanding belt 18 stop.
Next, the frame cylinder 79 operates to raise the sub-frame 73, and the split pad 71 group rises while keeping the shape in which the lower surface is concave.
The cycle ends. Hereinafter, if a new work W is set on the work transfer device 30 and the slide table 38 is moved inward from the original position, the polishing operation is repeated as described above.

(Effects of the Embodiment) The effects of the above-described embodiment are as follows.

The pedaling device 70 is the sanding belt 18
Are arranged along the running direction of the workpiece W, and are locked after being arranged along the shape of the polished surface of the work W, so that the divided pad 71 is formed into the shape of the work W. It will be molded together. Therefore, the treading device 70 including the group of divided pads 71 formed
When the sanding belt 18 is pressed against the work W at, the sanding belt 18
Will be pressed uniformly over the entire polished surface of the work W,
The entire polishing surface of the work W can be uniformly polished without causing local excessive polishing. In addition, the split pad 71
The group is formed in accordance with the shape of the polished surface of the work W, and is not limited to the shape in which the upper surface is convex as shown in FIG. 71
Since the group is formed into a shape conforming to that, polishing can be performed regardless of the shape of the work W.

Moreover, in the present embodiment, since the supporting rollers 114 on the left and right sides support the sanding belt 18 from below on both sides of the work W as shown in FIG. 18, the sanding belt is provided. The roller 1 supports the downward force received at the end of the work W by the roller 18.
14 can receive. Therefore, it is possible to prevent the sanding belt 18 from being strongly pressed against the end portion of the work W and excessively polishing it. If there is no support roller 114 at this position, the sanding belt 18 will come into strong contact with the corner of the end of the work W as shown in FIG. Will be generated.

Further, in this embodiment, the pedaling device 70 is mounted on the sub-frame 73, and it is detected that the work W has been sent below the sanding belt 18 and the sub-frame 73 is lowered. For this reason, the "end dripping" phenomenon on the feed direction side of the work W can be prevented as compared with a method in which the work is fed into the sanding belt while traveling at a constant height position.

Further, in the present embodiment, the sanding belt 18 is taken into consideration in view of the fact that the division pad 71 group of the treading device 70 is formed in conformity with the shape of the work W and the sanding belt 18 is run along this. A cross belt system in which the work W travels at right angles to the feed direction is adopted. The reason is as follows. That is, in the wide belt system in which the sanding belt runs along the work feeding direction, a sanding belt having a width equal to or larger than the width of the work is required, but such a belt is inevitably difficult to deform. . Therefore, when polishing a work having a large width dimension, it is difficult to move the sanding belt along the shape of the polished surface of the work, and the work W having a shape having large irregularities cannot be polished. On the other hand, if the cross belt system is used as in the present embodiment, the drive belt 14 and the sanding belt 18 having a small width can be used.
18 easily deforms along the shape of the polished surface of the work W, and the stepping device 70 is formed in accordance with the shape of the work W;
It is suitable for the belt sander of the present embodiment in which the sanding belt 18 runs along the shape.

Generally, in a belt sander machine, when excessive tension acts on a sanding belt, a convex work is locally over-polished and a concave work is over-polished at the end and bottom. Exhibit a tendency to be insufficiently polished.

In view of this, the present embodiment employs a double belt system in which the driving belt 14 is provided on the inner peripheral side of the sanding belt 18.
A driving force is applied to the motor 8. For this reason,
The driving force to be applied from the driving roll 12 to the sanding belt 18 is smaller than when the driving force is directly applied only to the sanding belt 18, and accordingly, the tension applied to the sanding belt 18 is also smaller. As a result, the sanding belt 18 is flexibly deformed according to the shape of the work W, and the occurrence of local excessive polishing or insufficient polishing is prevented.

Further, in the belt sander, as the running speed of the sanding belt becomes higher, there is a tendency that the convex portion is excessively polished or "edge dripping" occurs. However, when the sanding belt is run at a low speed, a problem arises that a sufficient sanding amount cannot be obtained.

In view of this point, in the present embodiment, the slide table 38 of the work transfer device 30 is provided with the vibration motor 51, and the combination of the cam disk 52, the swing rod 54 and the like supports the support table during the polishing operation of the work W. 50 was configured to vibrate in the feed direction. As a result, the work W vibrates in the direction orthogonal to the running direction of the sanding belt 18, and is subjected to the polishing action by the belt 18. By doing this, the sanding belt 18
Even if the traveling speed is low, a sufficient amount of sanding can be ensured, and eventually, the amount of sanding can be ensured without causing excessive polishing of the projections or "end dripping".

Further, in this embodiment, the control panel 200 has the same number of fine adjustment switches 22 corresponding to the group of divided pads 71.
0 is provided so that each pad cylinder 72 can be operated according to the operation of the switch 220. Thus, the upper and lower positions of the divided pads 71 can be freely adjusted individually during the forming operation of the divided pads 71 group, and the divided pads 7 can be more accurately formed into a shape following the shape of the polished surface of the work W.
One group can be formed, and more uniform polishing can be performed.

In the present embodiment, during the forming operation of the divided pad 71 group, the divided pads 71 are not lowered simultaneously toward the work W, but as shown in FIG.
First, the divided pad 71 located at the center is lowered, and every time a predetermined time elapses, the adjacent divided pad 71 is sequentially lowered. As a result, the divided pad 71 can surely descend to the lowermost portion of the concave portion of the work W, so that the group of divided pads 71 can accurately follow the shape of the work W, and the stepping device 70 can be accurately adjusted. It can be formed, which further contributes to uniform polishing.

In this embodiment, the upper roller 87 and the lower roller 88 for sandwiching the drive belt 14 from above and below are provided on each of the split pads 71 except for the ones at both ends. Therefore, even if the divided roller 71 group is formed into a shape having a concave lower surface (see FIG. 2), the drive belt 14 travels without leaving the divided pad 71 group. Therefore, the driving belt 14 is not subjected to a force in the direction away from the group of divided pads 71 due to the tension acting on the driving belt 14, and it is possible to prevent an excessive polishing action on the convex portion of the work W.

(Other Embodiments) The present invention is not limited to the above-described embodiments, but can be implemented in various modifications without departing from the gist thereof. For example, the present invention can be configured as follows.

In the above embodiment, the pad cylinder 72 is provided as the lifting mechanism, but instead of this, the pad cylinder 72 is provided.
For example, the guide rod 8 connected to the split pad 71
3 may be moved up and down by a screw mechanism.

In the above embodiment, the lock mechanism uses the brake mechanism 81 provided in each pad cylinder 72. However, as the pad cylinder not provided with the brake mechanism, the lock mechanism is used, and for example, it is divided. It is also possible to adopt a configuration in which the divided pad group is fixed by tightening the guide rod 83 connected to the pad 71 by a clamp mechanism.

Even if it is not necessary to use the double belt system,
The driving belt 14 of the above embodiment may be omitted and only the sanding belt 18 may be provided. Further, even in the case of the double belt system, the driving roll 12 with the sanding belt 18 applied thereto may not be provided with a driving force, and the sanding belt 18 may completely follow the driving belt 14 and run. . By doing so, the tension acting on the sanding belt 18 becomes extremely small, so that the conformability to the shape of the divided pad 71 group in the treading device 70 is further improved, and the effect of uniform polishing is seen, and the cost is reduced. Will also be advantageous.

In the above embodiment, during the forming operation of the treading device 70, when the group of pad cylinders 72 is locked after the group of divided pads 71 is lowered, the control panel 20 is locked.
Each of the cylinders 72 is locked when the 0 molding switch 208 is manually operated. However, the present invention is not limited to this, and a switch for detecting the rise of the rod 85a of the buffer air cylinder 85 is provided, and each split pad 71 comes into contact with the work W and further downward movement is restricted, so that the rod 85a rises. Then, the rise may be detected by a switch, and the brake mechanism 81 of each pad cylinder 72 may be operated based on this. In this way, the molding and locking of the split pad 71 group can be automated.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing one embodiment of the present invention.

FIG. 2 is an overall front view.

FIG. 3 is a sectional view taken along line DD in FIG. 2;

FIG. 4 is a front view of the work transfer device shown partially broken.

FIG. 5 is a plan view of a work transfer device.

FIG. 6 is a side view of the work transfer device.

FIG. 7 is an enlarged vertical sectional view of the suction unit.

FIG. 8 is a schematic plan view showing a moving area of a slide table.

FIG. 9 is a rear view showing the sub frame with the supporting roller mechanism removed.

FIG. 10 shows a state in which the supporting roller mechanism is removed and EE in FIG.
Cross section taken along the line

11 is a sectional view taken along line FF in FIG. 2;

FIG. 12 is a longitudinal sectional view of a split pad.

FIG. 13 is a side view of a holding roller.

FIG. 14 is a rear view of the support roller mechanism.

FIG. 15 is a front view of a control panel.

FIG. 16 is a diagram showing a descending pattern and types.

FIG. 17 is a view showing a state in which a split pad is lowered.

FIG. 18 is a longitudinal sectional view of a divided pad portion showing a state of a sanding belt at an end of a work.

FIG. 19 is a view corresponding to FIG. 18 when there is no support roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Main frame 12, 15 ... Driving roll 13, 16 ... Driving roll 14 ... Driving belt 18 ... Sanding belt 30 ... Work transfer device 61 ... Suction unit 70 ... Treading device 71 ... Dividing pad 72 ... Pad cylinder (elevating mechanism) 73 ... sub-frame 81 ... brake mechanism (locking mechanism) 87 ... upper roller 88 ... lower roller 114 ... support roller W ... work

Claims (3)

(57) [Claims] 1. A main frame, a work transfer device for feeding a work in a predetermined direction with its polished surface facing up, and a direction crossing a plurality of rolls provided on the main frame and crossing the work transfer direction. An endless sanding belt that is run on the main frame, and a stepping device that is provided on the main frame on the inner peripheral side of the sanding belt and presses the running sanding belt against the work. The apparatus includes a plurality of divided pads arranged along the running direction of the sanding belt. Each divided pad is connected to an elevating mechanism for vertically moving the divided pads, and each of the elevating mechanisms is Move each of the divided pad groups to a height position corresponding to each part of the polishing surface of the work, and then fix it at that position. The mechanism is provided, the belt sander machine, characterized in that a support roller for receiving from the opposite side to the treading device the sanding belt at both ends outside the workpiece in the main frame side. 2. An endless drive belt is provided on the inner peripheral side of the sanding belt, and the pedaling device is arranged on the inner peripheral side of the drive belt so as to press the drive belt against the sanding belt. Claim 1
Belt sander machine described. 3. The belt sander according to claim 2, wherein the split pad includes an upper roller and a lower roller sandwiching both sides of the drive belt.