EP1985413B1

EP1985413B1 - Tire surface abrasion device for automobile

Info

Publication number: EP1985413B1
Application number: EP07706285A
Authority: EP
Inventors: Takashi Matsui
Original assignee: AIS Inc
Current assignee: AIS Inc
Priority date: 2006-01-30
Filing date: 2007-01-26
Publication date: 2011-01-05
Anticipated expiration: 2027-01-26
Also published as: WO2007086242A1; ATE494099T1; JP4495680B2; EP1985413A1; JP2007196347A; EP1985413A4; DE602007011728D1

Abstract

This invention presents a tire surface polishing device capable of a polishing with eye observations of a polishing position and polishing amount, and capable of an adequate polishing even for a tire having a complicated surface configuration. As shown in Fig.2 , the device comprises a tire rotation means 10 rotating a polishing belt means 20 polishing a grounding surface of the tire, a belt driving means 30, a belt touch-and-detaching means 40 touching the polishing belt to the tire and detaching the polishing belt from the tire. The polishing belt means 20 turns at a corner of the tire, thereby enabling a polishing of the corner. The polishing belt means 20 has an endless polishing belt. The belt driving means 30 is joined to a base 44 plunging the polishing belt toward the tire surface, in a state rotatable to a horizontal direction. Links 41,42 driving the base 44 is operated by a handle 51. The handle 51 and the polishing belt means 20 are moved to a same direction.

Description

Technical Field of the Invention

This invention relates to a surface polishing device for automobile tires. More concretely, this invention relates to a polishing device capable of a polishing with eye observations of a polishing position and polishing amount.

Technical Background

Automobile tires, especially studless tires for winter season, are often disposed as wastes when gripping performance on iced roads decreases by deterioration or deformation of rubber at the circumferential grounding surfaces, even though those still have enough tread heights and are usable.
The inventor had developed a tire outer-circumferential-surface polishing device for retrieving gripping force by polishing a tire surface, and proposed the invention described in Japanese Publication No. 2005-186195 .
Referring to Fig. 1 shown in the gazette of Japanese Publication No. 2005-186195 , the invention described therein is a polishing device comprising a polishing belt means 10, a tire retainer 20 and a tire holder 30. In the polishing belt means 10, a sanding belt 11 is tensed across a belt driving pulley 12 and a tail pulley 13 endlessly. The sanding belt 11 is driven by the belt driving pulley 12 endlessly. The tire retainer 30 is formed of a soft or hard roller, or a board provided just beneath the upper portion of the sanding belt 11. The tire holder 30 has a tire driving motor 32 capable of elevating. A tire 40 is mounted in a demountable way on a rotation rod of the tire driving motor 32. The device is characterized by that the tire is polished with selecting a type of the tire retainer 20, a rotation speed of the sanding belt 11 and the tire, and pressure of the tire onto the sanding belt 11, according to a purpose of polishing.
The invention described in Japanese Publication No. 2005-186195 has the merit that the grounding surface (tread) of a tire can be polished efficiently at a time, because the sanding belt for polishing is formed larger than width of the tire surface. However, wear out of a tire may take place only at a center portion, inversely only at both sides, or only at one side. The device of Japanese Publication No. 2005-186195 has a difficulty in polishing for such a partial wear-out, not suiting for polishing to correct such a partial wear-out.

Patent Reference 1: Japanese Publication No. 2005-186195 gazette

Disclosure of the Invention

The invention of this application presents a polishing device to polish a tire surface, which is capable of eye-observations of a polishing position and polishing amount, and capable of polishing a tire adequately even if it has a complicated surface figure.
The polishing device of this invention comprises a tire rotation means to rotate a tire, a polishing belt means to polish a tire surface, a belt driving means to drive the polishing belt means, a belt touch-and-detaching means to touch the polishing belt onto the tire and detach it therefrom, and a belt oscillation means enabling oscillation motion of the polishing belt means by turning it at a corner of the tire. In the polishing belt means, an endless polishing belt is provided, being movable to a direction in parallel to the rotation axis of the tire. The belt touch-and-detaching means has a first link, with a second link and a third link fitted to an end of the first link, the second link and the third link being connected to a base plunged toward the tire to be polished, the first link, the second link, the third link and the base form a parallelogram, the belt oscillation means joins a belt frame supporting the polishing belt to the base, the belt frame is fitted in a freely rotatable state on a vertical base rod provided on the base, a fluid-pressure cylinder is provided at the second link to plunge the base to the tire, a handle mechanism is connected to the first link to oscillate the belt frame by rotating the first link, and an oscillation angle restriction means is provided to restrict an oscillation angle of the belt frame.
The polishing device of this invention is also characterized by that the polishing belt is provided between a driving pulley and a driven pulley, axes of these pulleys are in parallel to the rotation axis of the tire to be polished, and a polishing width is approximately a half of the width of the tire to be polished.
The polishing device of this invention is also characterized by that; the polishing belt is provided between a driving pulley fitted to the belt frame and a driven pulley connected to a cylinder unit provided on the belt frame, a belt presser roller is provided at an intermediate position, the distance between the driving pulley and the driven pulley is altered by the cylinder unit to coordinate a tension applied to the polishing belt, and a plunge means is provided to apply a force making the belt presser roller project from the backside of the polishing belt to the front side.
The polishing device of this invention is also characterized by that; each rod of a driving pulley and a driven pulley supporting the polishing belt is fitted and rotatable on the belt frame, a belt driving motor to rotate the driving pulley is provided on the belt frame, and a polishing surface of the polishing belt is moved downward by the belt driving motor.
The polishing device of this invention is also characterized by that; the handle mechanism has a handle fitted on the pedestal, a lever is provided at a position on a rod of the handle, a L-type lever is provided at another position on the rod, an intermediate link links the lever and the L-type lever, an extra link links the L-type lever and the first link, and thereby the handle and the first link are capable of rotating to the same direction.
The polishing device of this invention is also characterized by that; the polishing belt oscillation means comprises an arch-shaped hole provided in the base and a cam follower provided on the belt frame, and the cam follower is engaged in the arch-shaped hole, being joined thereby.
The polishing device of this invention is also characterized by that; the oscillation angle restriction means of the polishing belt is composed of an arch-shaped hole provided in the base and a cam follower provided on the belt frame, the cam follower is engaged in the arch-shaped hole, being joined thereby, the cam follower is pinched by pinch links fitted on the base by fitting pins, and free ends of the pinch links are plunged to be closer to each other.
The polishing device of this invention polishes a tire, as the polishing belt under a high speed rotation is pressed onto the tire surface by the fluid-pressure cylinder, and as the polishing belt is moved to the width direction of the tire by a manual operation. Because the tire surface is polished under an eye observation, the invention has the effect that the gripping force of a tire, especially a winter tire, can be increased by retrieving an adequate roughness of the surface without polishing it excessively. In addition, it has the effect that an uneven abrasion where a tire (not limited to a summer tire) is worn out partially can be repaired easily to retrieve the original configuration.
The invention also has the effect that a corner of a tire can be polished easily as well as the grounding surface thereof, because the width of the polishing belt is approximately a half of the tire.
The invention also has the effect that tension applied to the polishing belt can be coordinated, because the driven pulley is connected to the cylinder unit as well as the polishing belt is tensed between the driving pulley and the drive pulley. Because the presser roller is provided between the driving pulley and the driven pulley, and because the presser roller is to press the backside of the polishing belt, the invention also has the effect that the polishing belt can be pressed onto the tire surface strongly by using the belt presser roller.
Because during polishing a tire the polishing belt is moved downward by the belt driving motor provided the belt frame, the invention has the effect that chips produced in the polishing can be collected easily.
In this invention, the vertical basis rod connects the belt frame having the polishing belt thereon and the base plunged toward the tire. The belt frame and the vertical basis rod as a turning axis are directed to an ordinate direction whereas the belt driving motor rotating the polishing belt is directed laterally. Therefore, the invention also has the effect that imbalance of weight is canceled to enable the belt frame to be rotated freely around the vertical basis rod, thereby enabling a more easily polishing of a tire corner.
In this invention, because the second link and the third link forming a parallelogram are connected to the first link as well as connected to the base, the surface of the base facing the tire is directed consistently. Therefore, the invention also has the effect that the surface of the polishing belt can be contacted consistently onto the tire.
Because the handle in the handle mechanism provided to the first link to rotate the base is connected to the first link via the intermediate link, the extra link and others, the invention also has the effect that the handle and the first link can be rotated to the same direction, thereby making a polishing more easier.
In this invention, the polishing belt oscillation means is one where the cam follower provided on the belt frame is joined in the arch-shaped hole provided in the base, and the oscillation angle of the belt frame can be restricted. Therefore, the invention also has the effect that contact of the belt driving motor to another element of the device can be avoided when the polishing belt is turned at a corner of the tire.
Because the cam follower joined in the arch-shaped hole of the base is pinched by the pinch links having the free ends plunged to be closer to each other, the invention also has the effect that the belt frame can immediately face rightly to the grounding surface of a tire when the belt frame turned for a polishing work of a tire corner comes back to the grounding surface

Brief Description of Drawings

Fig.1 is an ordinate cross-sectional view showing the tire surface polishing device of this invention as a whole.
Fig.2 is a plane view of Fig.1.
Fig.3 is an oblique view showing a polishing belt and a belt driving means.
Fig.4 is an ordinate cross-sectional view of Fig.3.
Fig.5 is a bottom view of the belt oscillation means.
Fig.6 shows a step of polishing the grounding surface of a tire by the polishing device.
Fig.7 shows a magnified view of the surface being polished in Fig.6.
Fig.8 shows steps of polishing corners of a tire by the polishing device.
Fig.9 shows a magnified view of the surface being polished in Fig.8.

Best Mode for Carrying Out the Invention

Each figure shows an embodiment of the invention. Fig.1 is an ordinate cross-sectional view showing the tire surface polishing device as a whole. Fig.2 is a plane view of Fig.1. Fig.3 is an oblique view showing a polishing belt and a belt driving means. Fig.4 is an ordinate cross-sectional view of Fig.3. Fig.5 is a bottom view of a belt oscillation means. In these figures, the tire polishing device comprises a tire rotation means to rotate a tire 1 as making the axis thereof horizontal, a polishing belt means 20 to polish the grounding surface (tread) of the tire 1, a belt driving means to drive this polishing belt means 20, a belt touch-and-detaching means 40 to touch and detach the polishing belt means to and from the tire, and the polishing-belt oscillation means 60 enabling oscillation motion of the polishing belt means 20 by turning the polishing belt of the polishing belt means 20 at a corner of the tire.
The tire rotation means 10, which rotates the tire 1 as making the axis thereof horizontal, is built in a pedestal 11 having casters. A bearing box 12 is provided on the pedestal 11. A tire support shaft 13 is provided horizontally and rotatable in the bearing box 12. An end of the tire support shaft 13 projects from the bearing box 12. The tire support shaft 13 is connected with a tire rotation motor 14 in the bearing box 12 by a belt or chain 15, being rotated thereby. When the tire 1 is mounted on the tire supporting shaft 13 projecting from the bearing box 12, a tire load-and-unload structure (not shown) fixes the tire so that the tire cannot be released from the tire supporting shaft 13.
In the belt polishing means 20, the polishing belt 21 formed of an endless belt is tensed between the driving pulley 22 and the driven pulley 23. In the intermediate position, is provided a belt presser roller 24. The rotation axes of the driving pulley 22, the driven pulley 23 and the presser roller 24 are in parallel to the rotation axis of the tire to be polished. The polishing width is approximately a half of the tire width. The driving pulley 22 is fitted on the belt frame 31. A rotation rod of the driven pulley 23 is connected to a cylinder unit 25. The cylinder unit 25 utilizes air pressure and is provided on the belt frame 31. The cylinder unit 25 coordinates a tension applied to the polishing belt 21 by altering the inter-axis distance of the driving pulley 22 and the driven pulley 23. The belt presser roller 24 is provided on the belt frame 31. A plunge means to plunge the polishing belt 21 from the backside to the front side is built in.
In a polishing operation, the belt presser roller 24 is used selectively. Tires have various figures in cross section, depending on kinds thereof. For example, if a tire to be polished has a gentle elliptic figure in cross section, a fine finish of polishing is rather enabled without using the belt presser roller 24. However, if a tire has a nearly linear shape at the center in cross section, the tire is not polished without pressing the polishing belt 21 strongly. In this case, therefore, the belt presser roller 24 is needed to press the polishing belt 21 strongly during the polishing. Some tires have depressions at centers in cross section. In this case, a fine-finish polishing is enabled by using the belt presser roller 24 as well.
The belt driving means 30 has the belt frame 31. Rods of the driving pulley 22 and the driven pulley 23 supporting the polishing belt 21 are fitted on the belt frame 31 in rotatable states as well as the supporting rod of the belt presser roller 24. The belt frame 31 is connected in a rotational state to a vertical basis rod 45 provided at a free end of the belt touch-and-detaching means 40 described later. On the belt frame 31, is provided a belt driving motor 32, which rotates the driving pulley 21.
In this embodiment, the belt frame 31 is joined to the belt touch-and-detaching means 40 by the structure where the vertical basis rod 45 provided at the belt touch-and-detaching means 40 is inserted into a hole provided in the belt frame 31. Otherwise, the vertical basis rod 45 may be provided at the belt frame 31 to join the both.
The belt touch-and-detaching means 40 has a first link 41, and a second link 42 and a third link 43 fitted at a free end of the first link 41. A base 44 is provided at free ends of these second and third links 42,43. The vertical basis rod 45, which is connected in a rotatable state to the belt frame 31, is provided on the base 44.
A base part of the first link 41 is fitted to the pedestal 11 by a pivot 46. Base parts of the second and third links 42,43 are fitted to the first link 41 by other pivots 47,48 respectively. A top end of the second link 42 is fitted to the vertical basis rod 45 provided on the base 44. A top end of the third link 43 is connected to the base 44 by a pivot 49. These second and third links 42,43 are connected to the base 44, keeping a parallelogram configuration in a plane view.
The belt touch-and-detaching means 40 comprises a handle mechanism 50 for rotating the first link 41. The handle mechanism 50 has a handle 51 which is fitted in a rotatable state to the pedestal 11 by a support pivot 52. The support pivot 52 has a lever 53. Another L-type lever 54 is fitted in a rotatable state to the pedestal 11 by another support pivot 55 provided apart from the support pivot 52. An intermediate link 56 is fitted to an end of the L-type lever 54 and a top end of the lever 53. Another end of the L-type link 54 and the first link 41 are linked by an extra link 57.
A top end of the handle 51 projects from the pedestal 11. The handle 51 is operated so that the first link 41 is rotated around the pivot 46. That is, the handle 51 and the first link 41 are rotated to the same direction. For example, when the handle 51 is rotated to the clockwise direction in a plane view, the first link 41 is also rotated to the clockwise direction in a plane view (i.e., to the left in a view from the handling position). It will be described later how the polishing belt 20 functions to touch a tire surface 2 when the first link 41 is rotated.
In addition to the above, the first link 41 comprises a cylinder mechanism to rotate the second link 42 solely. The numeral 58 is a fluid-pressure cylinder such as one using a gas pressure, which is provided to the first link 41. A piston rod 59 connected to a piston (not shown) projects from the cylinder and is connected to the second link 42. The fluid-pressure cylinder 58 is driven so that the second link 42 is rotated accompanying the third link 43. By this, the polishing belt 20 is made in touch with the tire 1, in a state enabling a polishing. The fluid-pressure cylinder 58 comprises a decompressing valve (not shown) inside.
The belt oscillation means 60 is built in between the belt frame 31 equipped with the polishing belt 20 and the base 44 comprising the second and third links 42,43. An arch-shaped through hole 61, which center is common to the vertical basis rod 45, is perforated in the base 44. A cam follower 62 provided at the belt frame 31 is stored in the arch-shaped through hole 61 in a slidable state. The belt frame 31 and the base 44 are connected to each other by the vertical basis rod 45 and the cam follower 62.
The arch-shaped through hole 61 and the cam follower 62 are elements of an oscillation angle restriction means to restrict the oscillation angle of the belt frame 31. The arch-shaped through hole 61 is formed at an intermediate position between the vertical basis rod 45 and the fitting position of the third link 43.
The cam follower 62 is stored in the arch-shaped through hole 61, being confined therein. The cam follower 62 reaches and projects from the back surface of the base 44. The cam follower 62 projecting from the arch-shaped through hole 61 is pinched by free ends of pinch links 64a,64b fitted on the base 44 by check pivots 63. A coil spring 65 pushing the free ends of the pinch link 64a,64b is provided to make them close to each other so that the pinch links 64a,64b can maintain the posture pinching the cam follower 62 all the time. The numeral 66 is a bracket provided on a line interconnecting the vertical basis rod 45 and the pivot 49 on the base 44. Each top end of each stopper 67 provided at each pinching link 64a,64b is put against the bracket 66. Each stopper 67 has a structure capable of coordinating the projection length.
Function of this embodiment will be described next. Fig.6 and Fig.7 show a step of polishing the grounding surface of a tire. Fig.6(A) shows a situation before starting the polishing. Fig.6(B) shows a situation where the polishing belt is touched on the tire surface to be polished. In starting the polishing, the tire 1 is loaded on the tire supporting shaft 13 and fixed so that it cannot be released during the polishing. The first link 41 and the handle 51 are directed to a direction perpendicular to the axial direction of the tire supporting shaft 13. The polishing belt 21 is faced to the tire surface 2 to be polished. Simultaneously, the piston rod 59 of the fluid-pressure cylinder 58 projects therefrom and rotates the second link 42 to the counter-clockwise direction, thereby moving the polishing belt 21 back to a position apart from the tire surface 2 to be polished.
The belt frame 31 supporting the polishing belt 21 is provided on the base 44 by the vertical base rod 45, and the second and third links 42,43 are provided on the base 44 and form a parallelogram. Accordingly, rotation of the second link 42 accompanies rotation of the third link 43, keeping the parallel relation thereof. Therefore, the base 44, that is, the polishing belt 21, moves forward and backward always in a state facing rightly to the tire surface 2 to be polished, when the second and third links 42,43 are rotated.
In this embodiment, an operator carries out a polishing of a tire with an eye observation. The operator stands at the right side in Fig.6(A), and positions himself or herself so as to manipulate the handle 51 by his or her right hand. The tire 1 is rotated by the motor 14 to the clockwise direction in a front view. The belt driving motor 32 rotates the polishing belt 21 so at to move it downward from the upper side while it polishes the tire surface.
In polishing the surface 2 of the tire 1 loaded as described, the fluid-pressure cylinder 58 is operated to pull the piston rod 59 therein. The second link 42 is rotated with the third link 43 to the clockwise direction, making the base 44 closer to the tire 1. The polishing belt 21 is contacted on the tire surface 2 to be polished, as shown Fig.6(B). In this, the cam follower 62 of the belt frame 31 supporting the polishing belt 21 maintains the situation of being pinched by the pinching links 64a,64b provided on the base 44.
The polishing pressure in polishing the tire surface 2 by touching the polishing belt 21 thereon is coordinated by the pressure of a fluid supplied to the fluid-pressure cylinder 58. In addition, when the handle 51 is turned right or left in the situation as shown, the first link 41 is rotated via the intermediate link 56 and the extra link 57. Thus, the base 44 is moved by the second and third links 42,43 fitted on the first link 41. As a result, the polishing belt 21 is moved to the width direction of the tire 1 along the tire surface 2, keeping the contact thereto. By this, the polishing belt 21 is enabled to polish the whole area of the tire surface 2. Polishing chips can be collected easily because the polishing belt 21 is moved downward from the upper side while it polishes the tire surface.
The intermediate link 56 and the extra link 57, which are provided between the handle 51 and the first link 41, rotate the first link 41 to the same direction as the handle 5. Accordingly, the polishing belt 21 is moved left when the handle 51 is turned left (clockwise), and it is moved right when the handle 51 is turned right (counter-clockwise).
In this embodiment, a polishing work by the polishing belt 21 is applicable to tires 1 having various outer diameters. The polishing depth on a tire surface by the polishing belt 21 is approximately 0.2 to 0.5 mm.
Fig.8 and Fig.9 show steps of polishing corners of a tire. Fig.8 shows a step of polishing a left (in a view from the operator's position) side corner of the tire. Fig.9 shows a step of polishing a right side corner of the tire.
Because the second link 42 is plunged to the clockwise direction by the fluid-pressure cylinder 58, a polishing is carried out as the polishing belt 21 is pressed onto the tire surface 2. When the center portion of the polishing belt 21 reaches the left side corner of the tire 1 as shown in Fig.8(A), the polishing belt 21 changes its direction along the corner of the tire 1. That is, the cam follower 62 provided on the belt frame 31 supporting the polishing belt 21 moves in the arch-shaped hole 61 of the base 44, thereby making the belt frame 31 oscillate with the polishing belt 21.
In Fig.9, the belt frame 31 supporting the polishing belt 21 is rotatable around the vertical basis rod 45 of the base 44. Accordingly, when the belt frame 31 is rotated around the vertical basis rod 45 to the clockwise direction, the cam follower 62 moves to the left side of the arch-shaped hole 61, pushing out the top end of the pinching link 64b against the coil spring 65. By allowing the belt frame 31 to rotate to the clockwise direction in a plane view, the polishing is continued as the polishing belt 21 is moved as keeping in touch with the corner of the tire 1.
The cam follower 62 is pinched by the pinch links 64a,64b. The free ends of the pinch links 64a,64b are plunged inward by the coil spring 65. Accordingly, when the polishing belt 21 comes back to the position to polish the grounding surface 2 after finishing the polishing of the corner, the polishing belt 21 immediately retrieves the posture facing rightly to the grounding surface 2.
Fig.8(B) shows a situation where a right side corner is polished by the polishing belt 21 having reached thereto. Although the belt frame 31 and the polishing belt 21 are turned to the direction reverse to the direction described above, function of the oscillation motion is the same as the above.

Industrial Applicability

As described above, the invention enables a polishing with an eye observation of a polishing amount and a polishing position, and presents a tire surface polishing device capable of an adequate polishing even for a tire having a complicated surface configuration.

Claims

A surface polishing device for automobile tires, comprising
a tire rotation means (10) rotating a tire,
a polishing belt means (20) polishing a surface of the tire,
a belt driving means (30) driving the polishing belt means,
a belt touch-and-detaching means (40) touching and detaching the polishing belt means to and from the tire,
characterised by
a polishing belt oscillation means (60) enabling oscillation motion of the polishing belt means by turning the polishing belt means at a corner of the tire, and
an endless polishing belt (21) provided in the polishing belt means in a state movable to a direction in parallel to a rotation axis of the tire to be polished,
wherein
the belt touch-and-detaching means (40) has a first link (41), with a second link (42) and a third link (43) fitted to an end of the first link (41), the second link and the third link being connected to a base (44) plunged toward the tire to be polished,
the first link, the second link, the third link and the base form a parallelogram,
the polishing belt oscillation means joins a belt frame (31) supporting the polishing belt to the base
the belt frame is fitted in a freely rotatable state on a vertical base rod (45) provided on the base,
a fluid-pressure cylinder (58) is provided at the second link to plunge the base to the tire,
a handle mechanism (50) is connected to the first link to oscillate the belt frame by rotating the first link, and
an oscillation angle restriction means (61,62) restricting an oscillation angle of the belt frame is provided.
The surface polishing device as claimed in the claim 1,
wherein
in the polishing belt means (20), the endless polishing belt (21) is provided between a driving pulley (22) and a driven pulley (23),
axes of the driving pulley and the driven pulley are in parallel to the rotation axis of the tire, and
a polishing width is approximately a half of the width of the tire to be polished.
The surface polishing device as claimed in the claim 2,
wherein
the polishing belt (21) is provided between the driving pulley (22) fitted on a belt frame (31) and the driven pulley (23) connected to a cylinder unit (25) provided on the belt frame,
a belt presser roller (24) is provided at an intermediate position, and the cylinder unit alters a distance of the driving pulley and the driven pulley, thereby coordinating a tension applied to the polishing belt,
further comprising
a plunge means plunging the belt presser roller toward a front side of the polishing belt from a backside of the polishing belt.
The surface polishing device as claimed in the claim 1,
wherein
the belt driving means (30) has a belt frame (31) on which rods of a driving pulley (22) supporting the polishing belt (21) and a driven pulley (23) are fitted in rotatable states,
a belt driving motor (32) to rotate the driving pulley is provided on the belt frame, and
the belt driving motor moves downward a surface of the polishing belt.
The surface polishing device as claimed in the claim 1,

wherein
the handle mechanism (50) has a handle (51) fitted on the pedestal,
a lever is provided at a rod part of the handle,
a L-type lever is provided at another part of the handle,
an intermediate link (56) links the lever and the L-type lever,
an extra link (57) links the L-type lever and the first link (41), and
the handle and the first link are capable of rotating to the same direction.
The surface polishing device as claimed in the claim 1,
wherein
the polishing belt oscillation means (60) comprises an arch-shaped hole (61) provided in the base (44) and a cam follower (62) provided on the belt frame (31), and
the cam follower is engaged in the arch-shaped hole, being joined thereby.
The surface polishing device as claimed in the claim 6,
wherein
the oscillation angle restriction means (61,62) of the polishing belt (21) is composed of the arch-shaped hole (61) provided in the base (44) and the cam follower (62) provided on the belt frame (31),
the cam follower is engaged in the arch-shaped hole, being joined thereby,
the cam follower is pinched by pinch links (64a,64b) fitted on the base by check pins, and
free ends of the pinch links are plunged to be closet to each other.