JP5346575B2 - Belt polishing apparatus and belt polishing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a belt polishing device and a belt polishing method, efficiently performing polishing, and suitable for a long endless belt, by reducing belt slip. <P>SOLUTION: Rotating shafts of rear guide rollers are transversely disposed to rotating shafts of a pair of front guide rollers, the rear guide rollers are disposed by separating by distance equal to the predetermined distance of the front guide rollers or smaller, a polishing belt is twisted at the front guide rollers to engage the belt with the rear guide rollers, and twist of the polishing belt is returned from the rear guide rollers to guide it to a driving roller, thus stretching the polishing belt over the respective rollers. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt polishing apparatus and a belt polishing method. The present invention relates to a belt polishing apparatus and a belt polishing method capable of reducing belt slip and reducing the weight and size of the belt polishing apparatus.

Belt polishing equipment with long endless belts circulates with an endless belt suspended between a drive roller and a plurality of guide rollers to polish the surface of mobile phone cases and other tools such as spanners. It is possible to efficiently polish cast parts such as polishing pipes, water faucet pipes, and joint pipes.
A belt polishing apparatus having such a long endless belt is already known (Patent Documents 1 and 2).
JP 2000-218490 A JP 2000-24901 A

Many of the conventional belt polishing apparatuses shown in Patent Documents 1 and 2 described above take a form in which a long belt is longitudinally circulated in a loop shape. This is because, when the long endless belt is circulated horizontally, there is a problem that the width is increased in the lateral direction, the depth direction is increased, and the apparatus is increased in size.
Further, in this type of belt polishing apparatus, the roller is often disposed along the belt loop, so that the driving roller is often placed near one of the guide rollers on the polishing position side. Therefore, there is a drawback that the length of the belt on the loose side becomes longer than the length of the belt on which the belt is tensioned with respect to the drive roller.

For this reason, the tension region of the polishing belt falls to ½ or less of its length, and when performing contact polishing at low pressure, belt slip is likely to occur, and the driving force is not sufficiently transmitted to the polishing head. .
However, when a long endless belt is used, the polishing efficiency is good, so that a long belt is used even if some belt slip occurs. In the case of using a long endless belt, the size of the apparatus is increased not only in the horizontal circulation but also in the vertical circulation type.
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and a belt polishing apparatus and a belt polishing method suitable for a long endless belt capable of efficiently polishing by reducing belt slip. Is to provide.
Another object of the present invention is to provide a belt polishing apparatus and a belt polishing method that can easily reduce the weight and size of a belt polishing apparatus using an endless belt.

In order to achieve such an object, the belt polishing apparatus and the belt polishing method according to the present invention are characterized in that a pair of front guide rollers and a pair of rear guide rollers are provided as a plurality of guide rollers, and the pair of front guide rollers is set in a predetermined manner. A pair of front guide rollers are arranged on the polishing position side, and the pair of front guide rollers are provided on the back side of the pair of front guide rollers. And a pair of rear guide rollers arranged at a predetermined interval or smaller than the predetermined interval, the rotation shaft of the drive roller is disposed on the back side with respect to the rotation shaft of the pair of rear guide rollers, and the polishing belt in circulating a shall engage the drive rollers abrasive belt grinding belt is folded back from the rear guide roller pair of front guide roller side is hung be between a pair of rear guide rollers, one These intervals in the width center of the guide roller or equal to the outer diameter of the drive roller after, and narrower than this, the abrasive belt is twisted to engage the pair of front guide roller guide roller after the pair The abrasive belts engaged and further engaged with the pair of rear guide rollers are untwisted and engaged with the drive rollers. Thus, the object to be polished is polished on the polishing position side.

Thus, in the present invention, the rotational axis of the rear guide roller is set laterally with respect to the rotational axes of the pair of front guide rollers and is equal to or equal to the predetermined distance between the front guide rollers. The rear guide roller is arranged with a small separation, and the polishing belt is twisted from the front guide roller to be engaged with the rear guide roller, and the twist of the polishing belt is returned from the rear guide roller to the rotation axis of the rear guide roller. A polishing belt is hung on each roller while being guided by a driving roller having a rotating shaft arranged horizontally.
This makes it possible to increase the winding angle of the polishing belt of the driving roller disposed between the pair of rear guide rollers in the circulation of the polishing belt, and to position the driving roller for hanging the polishing belt relative to the front guide roller. Can be positioned on the opposite side.
Thus, by adopting the belt winding position of the drive roller on the side opposite to the polishing position side, about 1/2 of the length can be secured as the tension region of the polishing belt, and the belt is transported in a balanced manner. Is possible. Moreover, by twisting the polishing belt, slipping against the roller is suppressed, and the action of holding the polishing belt at the center of the roller occurs, eliminating the need to use a barrel-shaped guide roller and enabling stable belt feeding. Become.
In addition, a pair of intermediate guide rollers is provided between the pair of front guide rollers and the pair of rear guide rollers, and the distance between the centers of the widths of the pair of rear guide rollers is equal to or smaller than the outer diameter of the drive roller. Then, the winding angle of the polishing belt can be wound around about 180 ° or more, so that the sliding with respect to the roller can be further suppressed.

Further, the polishing belt hung on the pair of front guide rollers is twisted and the back surface thereof is hung on the pair of rear guide rollers, and the position of the driving roller is guided from the rear guide roller to the front guide roller. If the loop is turned to the roller side, the circulation loop of the long polishing belt is folded three-dimensionally and compactly to the front guide roller side, so the belt polishing device for the long belt can be reduced in weight and size. Can be planned. In particular, if an intermediate guide roller is provided and the intermediate guide roller and the rear guide roller are bent in two stages, the weight can be reduced and the size can be reduced.
In addition, if the driving roller is arranged in the space between the pair of front guide rollers rather than the pair of rear guide rollers, the polishing belt can be easily attached and detached, and the driving force of the driving roller is sufficiently applied to the polishing head portion. Since it is transmitted, the belt can be made more difficult to slide, suitable for contact polishing at a low pressure, and further, the belt polishing apparatus can be reduced in weight and size. Thereby, efficient polishing becomes possible.
Furthermore, if the rear guide roller or the drive roller is provided so as to be able to advance and retreat with respect to the belt and any of these is used as a tension roller, the tension region of the polishing belt can be expanded to a range of 1/2 or more of its length, It becomes easy to set the polishing pressure of the workpiece to an optimum state.
As a result, even in a belt polishing apparatus in a low pressure and low speed state, slip of the polishing belt can be reduced and efficient polishing can be performed, and a belt polishing apparatus and a belt polishing method suitable for a long endless belt can be realized.

1 and 2, reference numeral 10 denotes a belt polishing apparatus, 1 denotes a chair-type machine base of the belt polishing apparatus 10, and a leg frame 1a of the machine base 1 is integrated with a bottom portion thereof. The machine base 1 is erected vertically by being fixed to a floor or the like via a mounting base 1b provided on the machine base.
Reference numeral 2 denotes a polishing head mounting base in which the center bottom portion is mounted on the upper portion of the leg frame 1a and fixed horizontally. Reference numerals 3a and 3b denote a pair of front guide rollers provided on the polishing head 4 (see FIG. 1B). The rotation shafts of the front guide rollers 3a and 3b are vertically arranged at a predetermined distance from the polishing head 4, and thus the front guide rollers 3a, 3b, 3 b is provided upright with respect to the polishing head mounting base 2.
A polishing head 4 is detachably mounted on the polishing head mounting base 2 via a bolt knob 4a for fixing the polishing head. The polishing head 4 is provided with a polishing roller 42 (see FIG. 1B) between the pair of front guide rollers 3a and 3b.
The pair of front guide rollers 3a and 3b may be provided directly on the polishing head mounting base 2 side instead of the polishing head 4.
The machine base 1 has a support frame 1c standing upright from the leg frame 1a. The support frame 1c is located on the back surface of the polishing head mounting base 2, and a drive roller 5 is attached to the support frame 1c. Is projected forward at the upper portion of the polishing head mounting pedestal 2 at the position of the central portion.

A pair of rear guide rollers 6a and 6b are supported by the forward / backward drive cylinders 7a and 7b on the column frame 1c, and the rotation shafts 6c and 6d are provided horizontally, and the rear guide rollers 6a and 6b are provided so as to protrude obliquely in the lateral direction. Has been. The forward / backward drive cylinders 7a and 7b are fixed to both side surfaces of the column frame 1c, and the forward / backward drive cylinders 7a and 7b are provided with exhaust operation switches 7 for discharging air from these cylinders.
The rotation shafts 6c and 6d of the rear guide rollers 6a and 6b are fixed to rods 7g and 7h of the forward / backward drive cylinders 7a and 7b via brackets 7e and 7f (see FIG. 2A).
Here, the interval between the rear guide rollers 6a and 6b is narrower than the interval between the front guide rollers 3a and 3b as shown in FIG.
The forward / backward drive cylinders 7a and 7b are air cylinders, and the rear guide rollers 6a and 6b are moved obliquely upward and downward by the forward / backward drive of the forward / backward drive cylinders 7a and 7b, and are advanced and retracted relative to the polishing belt 8. Accordingly, the rear guide rollers 6a and 6b serve as tension rollers.

A pair of intermediate guide rollers 3c and 3d have rotating shafts 3e and 3f disposed laterally behind the polishing head mounting base 2 at the lower portion of the support frame 1c, and the intermediate guide rollers 3c and 3d project in the lateral direction. The guide rollers 6a and 6b are arranged substantially parallel to the rotation shafts 6c and 6d. Accordingly, the rotation shafts of the pair of intermediate guide rollers 3c and 3d and the pair of rear guide rollers 6a and 6b are arranged at a predetermined angle from the horizontal direction or the horizontal direction.
The polishing belt 8 is an endless belt that engages with each of the guide rollers and the driving roller 5 and is looped around. The polishing belt 8 is circulated and fed by a motor 5 a that rotationally drives the driving roller 5. The hanging on each roller will be described later.
The motor 5 a is fixed to a motor base 5 b provided on the upper part of the polishing head mounting base 2 in the column frame 1 c of the machine base 1. The motor base 5b is provided integrally with the support frame 1c.

A polishing head 4 is disposed on the back surface of the region of the polishing belt 8 between the pair of front guide rollers 3a and 3b. A region on the surface side of the polishing belt 8 facing the polishing belt 8 is a polishing position side K for polishing the workpiece (workpiece).
As shown in the side view of FIG. 1B and the plan view of FIG. 2B, the polishing head 4 has a rotating shaft 42a of the polishing roller 42 provided on the mounting plate 41 and an advance / retreat arm 43a of the advance / retreat mechanism 43. Both ends are supported by brackets 44 provided on the head portion of the head. Thus, the polishing head 4 is an attachment mechanism in which the polishing roller 42 is disposed between the pair of front guide rollers 3a and 3b and moves forward and backward.
A mounting plate 41 is fastened and fixed to the polishing head mounting base 2 by screwing with a bolt knob 4a through a hole provided in the polishing head mounting base 2 from the back side of the polishing head mounting base 2 .
The advance / retreat mechanism 43 further includes a parallel link mechanism 43b and an air cylinder 43c, and one of the links of the parallel link mechanism 43b is link-coupled as an advance / retreat arm 43a. When the rod of the air cylinder 43c is coupled to the link 43d of the parallel link mechanism 43b, the advance / retreat arm 43a moves forward and backward with reference to the mounting plate 41 (polishing head mounting base 2), and the polishing roller 42 is driven at an arbitrary position by driving the air cylinder 43c. Is fixed and is brought into contact with and engaged with the back surface of the polishing belt 8.

The mounting plate 41 is provided with a roller rotation shaft turning mechanism 45 corresponding to the position of the back surface of the roller 3b. The roller rotation shaft turning mechanism 45 tilts the roller rotation shaft up and down, and adjusts the belt shift with respect to the position of the polishing belt engaged with the roller by this turning. This is provided with a ratchet type shaft rotation mechanism that rotates the rotation shaft 32 of the roller 3b in the vertical plane by the angle adjustment lever 45a and fixes the position thereof. Instead of this ratchet type shaft rotation mechanism, the angle adjustment lever 45a may be rotated to adjust the vertical inclination of the roller rotation shaft by a screw mechanism. .
31 is a rotating shaft of the roller 3a, and 32 is a rotating shaft of the roller 3b. The rotating shaft 32 is suspended by a support arm 46 extending from the base of the angle adjusting lever 45a and is supported in one piece. As a result, the rotation shaft 32 of the roller 3b can be swung in the vertical plane by the angle adjusting lever 45a to adjust the angle of the roller 3b.
Reference numerals 33 and 34 denote nut holes into which the bolt knob 4a is screwed, and the mounting plate 41 is fixed to the polishing head mounting base 2 at two locations via the nut holes 33 and 34. The bolt knob on the hole 34 side is omitted and not shown.

The rotation shafts of the pair of front guide rollers 3a and 3b and the rotation shafts of the rear guide rollers 6a and 6b are arranged in an orthogonal state and are horizontal, but as shown in the side view of FIG. The rotation shafts 3e and 3f of the intermediate guide rollers 3c and 3d are orthogonal to the rotation shafts 31 and 32 of the pair of front guide rollers 3a and 3b, but the rotation shafts 6c and 6d of the rear guide rollers 6a and 6b Is arranged horizontally with a slight angle.
On the other hand, the rotation axis of the drive roller 5 is disposed in a vertical plane parallel to the vertical plane on which the rotation axes 31 and 32 of the pair of front guide rollers 3a and 3b stand, and the rotation axis of the rear guide rollers 6a and 6b. 6c and 6d are installed horizontally.
The polishing belt 8 has a pair of front guide rollers 3a, 3b, intermediate guide rollers 3c, 3d, rear guide rollers 6a, 6b in a state where the rear guide rollers 6a, 6b are retracted to a lower position by the forward / backward drive cylinders 7a, 7b, and Engage with the driving roller 5 and hang around the front guide rollers 3a and 3b in a three-dimensionally folded state.
Reference numeral 9 denotes a guide pipe for introducing an air transport pipe and an electrical wiring line into the apparatus, and is attached to the head of the support frame 1c. Reference numerals 9a to 9f are side guides of the polishing belt 8 provided on each roller.

FIG. 3 is an explanatory diagram of a procedure for hanging the polishing helt.
First, in FIG. 3 (a), the exhaust operation switch 7 is turned on, the forward / backward drive cylinders 7a, 7b are retracted, the rear guide rollers 6a, 6b are retracted, and the back of the polishing belt 8 is hung on the drive roller 5 By twisting, the back surface is hung on the rear guide rollers 6a and 6b, and the polishing belt 8 is hung on the driving roller 5 and the rear guide rollers 6a and 6b in the state shown in FIGS. Next, the polishing belt 8 hung on the rear guide rollers 6a and 6b is lowered and guided to the back surface of the intermediate guide rollers 3c and 3d. The back surface of the intermediate guide rollers 3c and 3d is hung and the roller position adjusting lever 45a is moved forward. The front guide roller 3b is turned downward, the exhaust operation switch 7 is turned OFF, the forward / backward drive cylinders 7a, 7b are driven forward to move the rear guide rollers 6a, 6b forward, and the front guide rollers 3a, 3b are moved to the polishing belt. As shown in FIG. 3 (c) , the polishing belt 8 is hung on each roller.

As shown in FIGS. 4 (a) to 4 (c), the polishing belt 8 is removed by turning on the exhaust operation switch 7 and moving the forward / backward drive cylinders 7a and 7b backward to retract the rear guide rollers 6a and 6b. The polishing belt 8 may be removed from the rear guide rollers 6a and 6b, then from the drive roller 5, from the intermediate guide rollers 3c and 3d, and from the front guide rollers 3a and 3b.
Thereby, the long polishing belt 8 exceeding 3,000 mm can be easily hung on each guide roller and the drive roller 5, and can be removed.
This is because the circulation loop of the long polishing belt 8 is three-dimensionally and compactly folded toward the front guide rollers 3a and 3b, thereby reducing the weight and size of the belt polishing apparatus 10 for the long belt. be able to.
Moreover, a predetermined tension can be applied to the polishing belt 8 by driving the rear guide rollers 6a, 6b forward by the forward / backward drive cylinders 7a, 7b after hanging.

  In this embodiment, the intermediate guide rollers 3c and 3d are provided, and the polishing belt 8 is guided to the rear guide rollers 6a and 6b, so that the distance W between the centers of the rear guide rollers 6a and 6b (FIG. 2 (a )) Is set to the outer diameter of the driving roller 5 or a smaller interval. In this way, the winding angle of the polishing belt 8 can be wound around 180 ° or more. Thereby, the driving force of the driving roller 5 can be reliably transmitted, and the slip of the polishing belt 8 is reduced.

By the way, in the belt polishing apparatus 10, a workpiece mounting table or the like is often provided facing the polishing position side K. When there is such a workpiece mounting table, attachment and removal of the polishing belt 8 to and from the belt polishing apparatus 10 may be difficult because the workpiece mounting table becomes an obstacle.
In such a case, a rotary table may be provided between the floor surface and the mounting base 1b of the belt polishing apparatus 10. By rotating the belt polishing apparatus 10 by 90 ° or 180 ° from the polishing position side K by the rotary table, the positions of the front guide rollers 3a and 3b can be released from the work mounting table. If the workpiece mounting table on the front side is removed, the polishing belt 8 can be easily attached and detached even in such a case.

The endless polishing belt 8 in the belt polishing apparatus 10 is engaged with the rear guide rollers 6a and 6b in a state of being engaged with the front guide rollers 3a and 3b, and is further folded back and wound around the drive roller 5. It is suspended.
In this way, by hanging the polishing belt 8 from the front to the back and returning to the front, a compact circulation loop can be formed even with a long belt. In addition, the driving roller 5 is disposed between the rear guide rollers 6a and 6b, and the distance between the rear guide rollers 6a and 6b is made narrower than the distance between the front guide rollers 3a and 3b, so that the polishing is performed around the drive roller 5. The winding angle of the belt 8 can be increased.
Further, the engagement position of the driving roller 5 with respect to the polishing belt 8 is located at the end opposite to the polishing position side K by the front guide rollers 3a and 3b, and the rear guide rollers 6a and 6b serving as tension rollers on both sides. Therefore, the tension area of the polishing belt 8 can be expanded to 1/2 or more. In addition, by applying tension at two places on both sides of the drive roller 5, the drive balance and load balance with respect to the polishing belt 8 are improved.
Accordingly, even if the polishing load is lowered, the belt can be reliably conveyed, and the belt slip at the polishing position side K can be reduced. It is also possible to reduce the feed speed of the polishing belt 8.

  Further, without driving one of the front guide rollers 3a and 3b as a driving roller and without providing the driving roller 5 in the vicinity of these rollers, the driving roller 5 is positioned with respect to the position of the polishing belt 8 on the polishing position side K. By disposing on the opposite side, the drive balance and load balance with respect to the polishing belt 8 are improved. In addition, since the driving roller is not the front guide rollers 3a and 3b or in the vicinity thereof, the front guide rollers 3a and 3b and the polishing roller 42 disposed therebetween are detachably disposed on the polishing head mounting base. It becomes possible.

FIG. 5 is an explanatory diagram of another polishing head mounted on the polishing head mounting base 2.
FIG. 5A shows a polishing head 40 called a platen unit, which is provided with a platen head 42 a instead of the polishing roller 42.
FIG. 5B shows a polishing head 40 a called a protruding unit, which is provided with a protruding roller 42 b instead of the polishing roller 42. The protruding head 42b is provided such that the polishing roller 42 protrudes forward, and squeezing rollers 42c and 42d that squeeze the polishing belt 8 sandwich the belt from the outside on both sides.
The polishing roller 42b and the squeezing rollers 42c and 42d are fixed to the advancing / retracting arm 43a of the advancing / retracting mechanism 43, extending to the front to form a cross arm 42e.
FIG. 5C shows a polishing head 40b called a large-diameter unit in which the diameter of the polishing roller 42 is increased. In this case, the front guide rollers 3a and 3b are fixed to the arm 42f extending forward, and are fixed to the mounting base 41 side via this.
Although not visible in the drawings, the advance / retreat mechanism 43 and the roller rotation shaft turning mechanism 45 are disposed on the back surface of the polishing roller 42.

As described above, in the embodiment, the machine base is vertically arranged. However, the machine base may be installed horizontally, so that the pair of front guide rollers 3a and 3b can be arranged horizontally to feed the polishing belt 8 in the vertical direction.
In the embodiment, the intermediate guide rollers 3c and 3d are provided. However, the intermediate guide rollers 3c and 3d are deleted, and rear guide rollers 6a and 6b are provided at the positions of the intermediate guide rollers 3c and 3d. Also good. In this case, it is desirable that the rear guide rollers 6a and 6b are equal to or smaller than the distance between the front guide rollers 3a and 3b.
Furthermore, in the embodiment, the two rear guide rollers 6a and 6b are tension rollers, but the tension roller may be only one of the rear guide rollers 6a and 6b. Further, instead of the rear guide rollers 6a and 6b, the drive roller 5 side may be attached to be movable up and down, and this may be used as a tension roller.

FIG. 1A is a schematic side view of a belt polishing apparatus according to an embodiment to which the present invention is applied, and FIG. 1B is an explanatory view of a polishing head. FIG. 2A is a schematic front view of the belt polishing apparatus, and FIG. 2B is a plan view of a polishing head portion. FIGS. 3A to 3C are explanatory views of a procedure for hanging the polishing helt. FIGS. 4A to 4C are explanatory views of the removal procedure of the polishing helt. FIG. 5 is an explanatory diagram of another polishing head mounted on the polishing head mounting base.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Machine stand, 2 ... Polishing head mounting base, 1a ... Leg frame,
1b ... mounting base, 1c ... strut frame,
3a, 3b ... front guide roller, 3c, 3d ... intermediate guide roller,
4 ... polishing head, 5 ... drive roller,
6a, 6b ... rear guide roller, 6c, 6d, 7c, 7d, 42a ... rotating shaft,
7 ... Exhaust operation switch, 07a, 7b ... Advancing / retracting cylinder,
7e, 7f ... bracket, 7g ... rod,
8 ... Polishing belt, 9 ... Guide tube, 9a to 9f ... Side guide,
DESCRIPTION OF SYMBOLS 10 ... Belt grinding | polishing apparatus, 41 ... Mounting plate, 42 ... Polishing roller,
43 ... advance / retreat mechanism, 43a ... advance / retreat arm 43a, 43b ... parallel link mechanism,
43c ... Air cylinder, 44 ... Bracket,
45 ... Roller rotating shaft turning mechanism, 45a ... Roller position adjusting lever.

Claims (9)

In a belt polishing apparatus that has a driving roller and a plurality of guide rollers, and that engages and circulates an endless polishing belt by engaging the back surface with the plurality of guide rollers and the driving roller, and polishing the object to be polished.
The plurality of guide rollers comprises a pair of front guide rollers and a pair of rear guide rollers,
The pair of front guide rollers are disposed on the polishing position side at a predetermined interval,
The pair of rear guide rollers is provided on the back side of the pair of front guide rollers with the polishing position side of the pair of front guide rollers as a front surface, and the rotation axis thereof is relative to the rotation shaft of the pair of front guide rollers. Arranged horizontally and at an interval smaller than the predetermined interval,
The drive roller is provided on the back side, and a rotation shaft of the drive roller is disposed laterally with respect to a rotation shaft of the pair of rear guide rollers, and is located between the pair of rear guide rollers in the circulation of the polishing belt, and be one is engaged in Rukoto folded from said polishing belt the rear guide roller being hung before the guide roller side of the pair, said these intervals in the width center of the pair of rear guide rollers Equal to or smaller than the outer diameter of the drive roller,
The polishing belt is engaged with the pair of front guide rollers, twisted, engaged with the pair of rear guide rollers, untwisted, and engaged with the drive rollers, thereby being hung on the rollers. Belt polishing equipment.   The drive roller is disposed at a position where the polishing belt is folded back from the rear guide roller toward the pair of front guide rollers, and the pair of rear guide rollers is provided above or laterally than the pair of front guide rollers. A polishing roller that is engaged with the polishing belt between the pair of front guide rollers in circulation of the polishing belt, and at least one of the pair of rear guide rollers is capable of moving forward and backward with respect to the polishing belt. The belt polishing apparatus according to claim 1, wherein the belt polishing apparatus is a roller.   The pair of rear guide rollers is provided above or on the side of the pair of front guide rollers, and a polishing roller that engages the polishing belt is provided between the pair of front guide rollers in circulation of the polishing belt. 2. The belt polishing apparatus according to claim 1, wherein the driving roller is a tension roller capable of moving forward and backward with respect to the polishing belt. The pair of front guides further comprises: a machine base comprising a leg part, a support frame standing from the leg part, and a horizontal pedestal provided on the upper part of the leg part; and a polishing head removably attached to the pedestal. A pair of intermediate guide rollers is provided between the roller and the pair of rear guide rollers, and the rotation shafts of the pair of front guide rollers are disposed in a direction perpendicular to the pedestal, The pair of rear guide rollers has a rotation shaft disposed horizontally or at a predetermined angle from the horizontal direction, and the pair of intermediate guide rollers is disposed between the pair of front guide rollers and the pair of rear guide rollers. The belt polishing apparatus according to claim 2 or 3, wherein the belt polishing apparatus engages with the belt. The said pair of front guide rollers and the grinding roller further provided in the polishing head, the polishing roller protrudes before the pair of front guide roller, wherein the pair of intermediate guide roller and said pair of rear guide rollers The belt polishing apparatus according to claim 4, wherein the driving roller is provided on the support frame. In a belt polishing method having a driving roller and a plurality of guide rollers, and polishing the object to be polished by hanging and circulating an endless polishing belt by engaging the back surfaces of the plurality of guide rollers and the driving roller,
A pair of front guide rollers and a pair of rear guide rollers as the plurality of guide rollers;
The pair of front guide rollers are separated by a predetermined distance and arranged on the polishing position side,
The pair of front guide rollers is provided with the polishing position side as a front surface, and the pair of rear guide rollers is provided on the back side thereof. The pair of rear guide rollers are arranged with a gap or a gap smaller than this,
A rotation shaft of the drive roller is disposed on the back side with respect to a rotation shaft of the pair of rear guide rollers, and is disposed between the pair of rear guide rollers in the circulation of the polishing belt and from the rear guide rollers to the pair of rear guide rollers. a shall engage said drive roller to said polishing belt folded back before the guide roller side, or these intervals in the width center of the pair of rear guide rollers equal to the outer diameter of the driving roller, Narrower than this,
The polishing belt engages and twists with the pair of front guide rollers, engages with the pair of rear guide rollers, and further twists the polishing belt engaged with the pair of rear guide rollers and returns to the drive. A belt polishing method in which the polishing belt is hung on each roller so as to be engaged with a roller, and the polishing belt is circulated by the driving roller to polish the object to be polished on the polishing position side. The driving roller is disposed at a position where the polishing belt is folded back from the rear guide roller to the pair of front guide rollers, and the pair of rear guide rollers is provided above or on the side of the pair of front guide rollers, A polishing roller that engages with the polishing belt is provided between the pair of front guide rollers in circulation of the polishing belt, and at least one of the pair of rear guide rollers is a tension roller that can advance and retreat with respect to the polishing belt. The belt polishing method according to claim 6 . The pair of rear guide rollers is provided above or laterally from the pair of front guide rollers, and a polishing roller that engages the polishing belt is provided between the pair of front guide rollers in circulation of the polishing belt, and the driving The belt polishing method according to claim 6 , wherein the roller is a tension roller capable of moving forward and backward with respect to the polishing belt. A machine base comprising a leg part, a support frame standing up from the leg part, and a horizontal pedestal provided on the upper part of the leg part, a polishing head removably attached to the pedestal, and a pair of front guides are provided. A pair of intermediate guide rollers is provided between the roller and the pair of rear guide rollers, the rotation shafts of the pair of front guide rollers are arranged in a direction perpendicular to the pedestal, and the pair of intermediate guide rollers and the pair of intermediate guide rollers The rotation shaft of the rear guide roller is disposed horizontally or at a predetermined angle from the horizontal direction, and the pair of intermediate guide rollers is engaged with the polishing belt between the pair of front guide rollers and the pair of rear guide rollers. The belt grinding | polishing method of Claim 7 or 8 combined.

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