JPH10122256A - Universal joint and grinding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a universal joint that is able to be suitably used for a grinding or the like. SOLUTION: This is a joint being interposed between a driving turning shaft 12 and a driven shaft 13 and transmitting their turning effort, and it is provided with a first chain sprocket 14, a second chain sprocket 15, of the same shape as the first chain sprocket, being clamped tight to the driven turning shaft 13 so as to be almost concentrically situated after being opposed to the first chain sprocket 14, and a double chain 16 being formed into a ring form of the same diameter with both these first and second chain sprockets 14 and 15 while made up of connecting two rows of roller chains being attached to these first and second chain sprockets 14 and 15 tightly with each other, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a universal joint capable of transmitting rotation between inclined rotating shafts, and is suitable for use in a polishing apparatus.

[0002]

A polishing tool having a polishing pad attached to a driving rotary shaft is used for polishing and cleaning a window glass surface of a vehicle, polishing a painted surface, and the like.
In this operation, an operator holds a polishing tool and performs polishing by pressing the polishing pad against the surface to be polished while rotating the polishing pad with the polishing tool.

The glass surface and the painted surface have irregularities and undulations, and the surface is not an accurate flat surface. When an operator works with a polishing tool, the operator performs the polishing operation while changing the direction of the tool according to the unevenness or undulation of the surface so that the polishing pad hits the polishing surface with even force. .

[0004] On the other hand, when the above polishing operation is to be automated or semi-automated, it becomes a problem how to press the polishing pad evenly against the surface to be polished having irregularities and undulations. One solution is to allow the polishing pad to tilt freely according to the tilt of the polished surface. There is a universal joint such as a hook joint to transmit rotation between inclined rotating shafts, but conventional universal joints are used with both the driving rotary shaft and the driven rotary shaft supported by a frame. In the free state where the driven rotary shaft is not supported by the frame, the driven rotary shaft cannot be rotated stably.

The present invention has been made in view of the above, and an object of the present invention is to provide a universal joint which can be suitably used for a polishing apparatus or the like.

[0006]

A universal joint according to the present invention for achieving the above-mentioned object is a joint interposed between a driving rotary shaft and a driven rotary shaft for transmitting a rotating force, wherein A first chain sprocket fixed to a rotating shaft; and a first chain sprocket having the same diameter as the first chain sprocket fixed to the driven rotating shaft so as to be substantially coaxially opposed to the first chain sprocket. A second chain sprocket and two rows of roller chains which are formed in an annular shape having the same diameter as the first and second chain sprockets and which are respectively mounted on the first and second chain sprockets are connected and fixed to each other. And a two-row chain.

In this universal joint, when the first chain sprocket rotates due to the rotation of the drive rotation shaft, the rotation is transmitted to the second chain sprocket via the two-row chain rotating together. Since there is a certain amount of play in the meshing portion between the first and second chain sprockets and the double-row chain, even if the axis of the first chain sprocket and the second chain sprocket is slightly inclined, the rotational force can be smoothly increased. It can be transmitted to the second chain sprocket.

[0008] The polishing apparatus according to the present invention comprises a driving rotating shaft, a first chain sprocket fixed to the driving rotating shaft, and the first chain sprocket located substantially coaxially opposed to the first chain sprocket. A second chain sprocket having the same diameter as the first chain sprocket, and two rows of two chain sprockets having the same diameter as the first and second chain sprockets and being mounted on the first and second chain sprockets, respectively. It has a double-row chain formed by connecting and fixing roller chains to each other, and a polishing pad mechanically connected to the second chain sprocket.

The polishing apparatus according to the present invention further comprises a support frame, suction cup means for detachably fixing the support frame to an object, and a polishing unit movably supported on the support frame in a plane. Wherein the polishing unit comprises: a driving rotary shaft, a first chain sprocket fixed to the driving rotary shaft, and the first chain sprocket located substantially coaxially opposite the first chain sprocket. A second chain sprocket having the same diameter as that of the first and second chain sprockets, and two rows of roller chains that are respectively mounted on the first and second chain sprockets. It has a double-row chain connected and fixed to each other, and a polishing pad mechanically connected to the second chain sprocket. To.

The drive rotating shaft, the first and second chain sprockets, and the polishing pad each have a hole substantially coaxially at the center thereof, and an abrasive passes through the hole so that an abrasive is supplied to a center of rotation of the polishing pad. Supplied to

[0011]

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

FIG. 1 is a half sectional view of a universal joint according to the present invention. As shown in FIG. 1, the universal joint 11 is interposed between a drive rotation shaft 12 and a driven rotation shaft 13 which are arranged substantially coaxially, and is connected to a first chain sprocket 14 fixed to the drive rotation shaft 12. A second chain sprocket 15 having the same diameter as the first chain sprocket 14 fixed to the driven rotary shaft 13, and a double-row chain 16 mounted across the first and second chain sprockets 14, 15. . The two-row chain 16 is formed by connecting and fixing two rows of roller chains formed in an annular shape having substantially the same diameter as the first and second chain sprockets 14, 15,
The teeth 17, 1 of the first and second chain sprockets 14, 15 between each roller of the two rows of roller chains.
8 are all fitted.

Therefore, in the universal joint 11, when the first chain sprocket 14 rotates by the rotation of the drive rotation shaft 12, the rotation is transmitted to the second chain sprocket 15 via the double-row chain 16 that rotates together. The driven rotation shaft 13 is rotated. Here, since there is a certain amount of play in the meshing portion between the first and second chain sprockets 14 and 15 and the double-row chain 16, the first chain sprocket 14 (drive rotary shaft 12) and the second chain sprocket 15 (the driven rotary shaft 13), the rotational force of the drive rotary shaft 12 can be transferred to the driven rotary shaft 1
3 can be transmitted.

The range in which the axis of the drive rotary shaft 12 and the driven rotary shaft 13 can be inclined is the range of play of the chain meshing portion, and is usually about several to several tens of degrees in angle. However, it is possible to set the angle range in which the inclination can be made by changing the amount of play according to the purpose of use.

Further, since the universal joint 11 has a limited angle range in which it can be tilted, for example, the driven rotary shaft 1
The driven rotary shaft 13 can be stably rotated even in a free state in which the driven shaft 3 is not supported by the frame.

Further, since the universal joint 11 is connected to the shaft via the chain sprockets 14 and 15, the universal joint 11 can be applied to a hollow shaft.

Next, an example in which the present universal joint is applied to a polishing and cleaning apparatus will be described.

FIG. 2 is an overall front view of a polishing and cleaning apparatus according to an embodiment of the present invention, FIG. 3 is a sectional view taken along the arrow A of FIG. 2, and FIG. 4 is a bottom view of the polishing and cleaning apparatus of FIG. .

The present embodiment is an example constructed for the purpose of polishing and cleaning the outer window glass of a Shinkansen vehicle.
35H x 700W (mm). As shown in FIG. 2, the polishing and cleaning device 21 has a rectangular support frame 22 that is larger than the window to be polished and cleaned. The support frame 22 is formed by connecting and fixing upper and lower horizontal frame members 23 parallel to each other with left and right channel members 24, and a handle 25 is attached to the center of the front surface of each of the left and right channel members 24.

The supporting frame 22 is provided with suction means for detachably fixing the supporting frame 22 to an object. Three pad mounting brackets 26 are fixed to the upper and lower horizontal shaft frames 23, and suction pads 27 constituting suction cup means are fixed to the pad mounting bracket 26 by a universal joint (not shown).
Are supported so as to be tiltable in an arbitrary direction and to be adjustable in the axial direction. A suction tube (not shown) is connected to the suction pad 27, and the channel material 2
4 is connected to the flow path of the compressed air via an ejector (not shown) for generating a vacuum provided in the inside.

Suction switches 28a and 28b are attached to the left and right channel members 24 immediately above the handle 25, and the air in the suction pad 27 is sucked by operating these suction switches 28a and 28b. Sticks to target surface. Here, the connection of the piping tube of the suction pad 27 is made up of two systems of air flow paths in consideration of safety. As shown in FIG. 5 showing an explanatory view of the flow path configuration, an upper central suction pad 27b and a lower left and right suction pad 27d,
27f are connected to the same flow path, are controlled by a suction switch 28a on the left side, and have upper left and right suction pads 27a and 27c and a lower central suction pad 2a.
7e are connected to different flow paths, and are controlled by a suction switch 28b on the right side.

Therefore, even if the suction pad 27 on one system side is released due to the cutoff of the air source or the like, the other suction pad 27 is working, so that the occurrence of a fall accident of the support frame 22 can be prevented.

Further, by making the air pressures of these two systems different, one is used for low-pressure adsorption and the other is used for high-pressure adsorption. In this case, the position of the support frame 22 can be corrected while being suctioned by operating the suction pad 27 on the low pressure side first, and after the position is corrected, the suction pad 27 on the high pressure side is operated and completely fixed by high pressure suction. To do. The air flow path will be described later.

A horizontal slider 30, which is a first slider, is mounted on the upper and lower horizontal frames 23 so as to be movable in the horizontal direction. FIG. 6 is a front view of the horizontal axis slider,
7 is a bottom view and FIG. 8 is a side view of the same. The horizontal axis slider 30 has a slide base 31, and roller shafts 32 are provided at four corners of the slide base 31 with nuts 3.
3 is fixed. As shown in FIG. 7, a guide roller 35 is supported on each roller shaft 32 via a bearing 34.

The guide roller 35 is made of a synthetic resin and has a flange 36 projecting from the center of the circumferential surface. on the other hand,
As shown in FIG. 8, the horizontal axis frame 23 has a substantially square cross-sectional shape, and a guide groove 37 is formed in the center of the upper and lower surfaces along the longitudinal direction. The circumferential surfaces of the guide rollers 35 abut against the upper and lower surfaces of the horizontal frame 23, and the flanges 36 of the guide rollers 35 fit into the guide grooves 37 (FIG. 8).
reference). In this manner, the slide base 31 is supported by the horizontal frame 23 by sandwiching the horizontal frame 23 from above and below with the guide rollers 35, and the slide base 31 is rolled on the horizontal frame 23 by the guide rollers 35. Moves along the horizontal axis frame 23.

The grooves 3 are also provided on the front and rear surfaces of the horizontal axis frame 23.
8 is formed. Holes 39 are formed at the four corners and the center of the cross section. This is to reduce the weight while maintaining the strength of the horizontal shaft frame 23, and the holes 39 are formed in the above-mentioned suction pads 27. Used as an air flow path.

The four roller shafts 32 of the slide base 31
Of the two, the lower two are configured such that the support shaft for the slide base 31 and the support shaft for the guide roller 35 are slightly eccentric. That is, when the roller shaft 32 is fixed to the slide base 31, the axis of the guide roller 35 can be displaced with respect to the slide base 31 by rotating the support shaft with respect to the slide base 31. . Therefore, when the slide base 31 is attached to the horizontal frame 23, the distance between the upper and lower guide rollers 35 sandwiching the horizontal frame 23 can be finely adjusted, and the slide base 31 extends over the entire length of the horizontal frame 23. Can be moved smoothly and without delay.

As shown in FIG. 8, a support plate 40 is fixed to the slide base 31 in the middle of the roller shaft 32 by bolts 41, and stopper bolts 42 are screwed into screw holes formed in the support plate 40. . A horizontal shaft stopper knob 43 is fixed to a lower portion of the stopper bolt 42, and a urging member 44 made of urethane is fixed to an upper portion of the stopper bolt 42 so as to face the horizontal shaft frame 23.

By rotating the stopper bolt 42,
The pressing member 44 at the tip approaches and separates from the horizontal frame 23. As shown in FIG. 8, the pressing member 44 is
The slide base 31 can be moved with respect to the horizontal axis frame 23 in a state away from the slide base 3. As needed,
When the stopper bolt 42 is screwed by holding the horizontal axis stopper knob 43, the pressing member 44 comes into contact with the horizontal axis frame 23, and the slide base 31 is clamped to the horizontal axis frame 23.

As shown in FIG. 7, a stand 46 carrying a vertical slide shaft 45 is removably mounted on the slide base 31. 2 on the slide base 31
The two positioning holes 47 are drilled in the stand 46 while the positioning pins 47 are fixed upright by screws, and by inserting the positioning pins 47 into the positioning holes 48, the stand 46 is moved to a predetermined position on the slide base 31. Is positioned.

At the center of the stand 46, a height adjusting handle 49 is rotatably mounted.
A screw engraved at the tip of 9 is screwed into the screw hole 50 of the slide base 31. Compression coil springs 51 are interposed between the slide base 31 and the stand 46 on both sides of the height adjustment handle 49, respectively.
7, the stand 46 is urged upward in FIG. A screw hole is formed on both sides of the stand 46 with the height adjustment handle 49 interposed therebetween, and a stopper screw 52 is screwed into the screw hole. The tip of the stopper screw 52 can be brought into contact with the upper surface of the slide base 31.

By rotating the height adjustment handle 49 to move the stand 46 toward the slide base 31 against the spring force of the compression coil spring 51, the stand 46 approaches and separates from the slide base 31 (FIG. 7). The position of the stand 46 (up and down direction) can be adjusted. Also, by pressing the ends of the stopper screws 52 on both sides against the slide base 31, the stand 46 is fixed to the slide base 31 at that position.

The stand 46 has two holes 53 into which the vertical slide shaft 45 is inserted, and the vertical slide shaft 45 is fixed to the stand 46 by fixing bolts 54 shown in FIG. The vertical slide shaft 45 is made of an aluminum pipe for weight reduction, and its surface is coated with molybdenum to increase hardness.

The two horizontal axis sliders 30 composed of the slide base 31, the stand 46 and the like have the same configuration, and two vertical axis slide shafts 45 are attached so as to bridge them as shown in FIG.

A vertical slider 55 as a second slider is attached to the two vertical slide shafts 45 so as to be movable in the vertical direction (vertical direction in FIG. 2). FIG. 9 is a front view of the vertical slider 55. As shown in FIG. 9, the vertical axis slider 55 is positioned so as to straddle the two vertical axis slide shafts 45 and is movably supported via a slide bush (not shown). By rotating the screwed stopper lever 56, the stopper can be clamped to the vertical slide shaft 45 at an arbitrary position. As shown in FIGS. 3 and 4, a pair of handles 57 is attached to the vertical axis slider 55.

As described above, the horizontal slider 30 and the vertical slide shaft 45 can move in the horizontal direction with respect to the support frame 22, and the vertical slider 55 can move in the vertical direction with respect to the vertical slide shaft 45. , Vertical axis slider 5
By moving the handle 57 with the handle 5, the vertical slider 55 can be smoothly moved to any position in the plane of the support frame 22, and can be clamped at any position.

The polishing unit 70 is mounted on the vertical slider 55. FIG. 10 is a front view of the polishing unit, and FIG.
FIG. 3 is a sectional view of a main part of the polishing unit. 10 and FIG.
In FIG. 1, the left side is the upper side in the entire apparatus due to the space limitation, and the surface of the window glass G to be polished and cleaned is oriented substantially vertically.

As shown in FIG. 10, the polishing unit 70 has a substrate 71 for supporting the whole unit, and this substrate 71 is fixedly supported by the vertical slider 55. An air motor 72 and a gear box 73 are fixed to the substrate 71. A support plate 74 is fixed to a casing of the air motor 72, and an air cylinder 75 is supported on the support plate 74. The support plate 74 supports a container mounting arm 77 via a support rod 76, and the abrasive container 78 is detachably attached to the container mounting arm 77. An abrasive outlet 79 is provided at a lower portion of the abrasive container 78, and the abrasive in the abrasive container 78 flows down from the abrasive outlet 79 when the supply 80 provided above the abrasive outlet 79 is operated. The abrasive container 78 is 500
It has a capacity of about cc, and is used by attaching an abrasive in advance to a container and then attaching it to the container mounting arm 77.

As shown in FIG. 11, a toothed spline nut 84 which is located in a gear box 73 fixed to a rotating shaft 81 of an air motor 72 and is supported in the gear box 73 via a bearing 83. Are engaged with the gear 82 of the air motor 72.

The air cylinder 75 moves the drive shaft 85 vertically toward and away from the surface of the window glass G. A joint block 86 is fixed to the drive shaft 85, and the hollow spline shaft 8 is mounted on the joint block 86 via a bearing 87.
8 is supported. The spline shaft 88 meshes with a toothed spline nut 84, and the rotation of the air motor 72 is transmitted to the spline shaft 88 through the gear 82 and the toothed spline nut 84.

An abrasive supply pipe 89 is provided in the hollow portion of the spline shaft 88 in a state insulated from the rotation of the spline shaft 88. The abrasive supply pipe 89 has its base end screwed and fixed to the joint block 86 and communicates with a flow path 90 formed in the joint block 86. The flow path 90 of the joint block 86 communicates with an abrasive supply port 91, and the abrasive supply port 91 communicates with an abrasive outlet 79 of an abrasive container 78 shown in FIG. 10 through a hose (not shown).

A polishing pad 110 is connected to a spline shaft 88 which is a driving rotary shaft via a universal joint 100 according to the present invention.
Are linked. That is, the first chain sprocket 101 is fixed to the tip of the spline shaft 88. A second chain sprocket 102 having the same diameter is disposed coaxially opposite the first chain sprocket 101, and a double-row chain 103 is mounted across the first and second chain sprockets 101 and 102. Double-row chain 10
3 is the first and second chain sprockets 101, 10
Two rows of roller chains formed in an annular shape having substantially the same diameter as 2 are connected and fixed to each other, and the teeth of the first and second chain sprockets 101 and 102 are interposed between each roller of the two rows of roller chains. All of them are in a fitted state.

Therefore, the operation of the universal joint 110 drives the spline shaft 88 to drive the first chain sprocket 10
As one rotates, that rotation is transmitted to the second chain sprocket 102 via the co-rotating double row chain 103. Here, since there is a certain amount of play at the engagement portion between the first and second chain sprockets 101 and 102 and the double-row chain 103, the axis of the first chain sprocket 101 and the axis of the second chain sprocket 102 The rotation force can be transmitted to the second chain sprocket 102 without any trouble even if the vehicle is inclined.

A disk-shaped pad mounting bracket 104 having a hole at the center is fixed to the second chain sprocket 102 by bolts 105. A compression coil spring 106 is wound between the first chain sprocket 101 and the pad mounting member 104, and the spring force of the compression coil spring 106 causes the first and second chain sprockets 10 to be wound.
1 and 102 are urged to move away from each other. The compression coil spring 106 is provided with first and second chain sprockets 101, 1
In this manner, the backlash between the first and second chain sprockets 101 and 102 can be smoothly rotated even when the axes of the first and second chain sprockets 101 and 102 are inclined.

A V-ring 107 is mounted between the outer periphery of the tip end of the spline shaft 88 and the pad mounting member 104 to prevent abrasives and the like from entering the space therebetween. Also, the V-ring 107 and the first chain sprocket 10
A plurality of O-rings 108 are fitted in a press-contact state, and the V-ring 107 is pressed against the pad mounting bracket 104 by the elastic force of the O-ring 108. Thereby,
Second chain sprocket 102, pad mounting bracket 1
Also when the 04 is tilted, liquid leakage can be prevented by moving the V-ring 107 following it.

A hook-and-loop fastener (magic tape) 109 is attached to the surface of the pad mounting member 104. On the other hand, the polishing pad 110 has a disk shape (a donut shape) having a hole in the center, and a polishing cloth 112 made of a felt material is adhered to the surface of a base material 111 made of a sponge material, and the surface fastener 109 is formed on the back surface. A hook-and-loop fastener 113 that can be detachably adhered is adhered. Polishing pad 110
Is the pad mounting bracket 1 by the hook-and-loop fasteners 109 and 113.
The polishing pad 110 is detached from the pad mounting bracket 104 and replaced as necessary, such as a change in the stained state of the object to be cleaned and cleaning of the polishing pad 110 itself.

The tip of the polishing agent supply pipe 89 is connected to the spline shaft 8.
The polishing pad 8 protrudes from the tip of the polishing pad 8 and serves as a discharge port 120 for the polishing agent. A bearing bush 121 is interposed between the tip of the spline shaft 88 and the abrasive supply pipe 89, and a retaining ring 122
Is prevented from falling off.

FIG. 12 is an explanatory view showing a state where the axes of the first and second chain sprockets 101 and 102 are inclined. In FIG. 12, the rotation center axis of the spline shaft 88 is perpendicular to the plane represented by the two-dot chain line, but the second chain sprocket 102 (that is, the polishing pad 11
The rotation center axis of 0) is inclined from the vertical, and the polishing pad 110
Are inclined with respect to the plane indicated by the two-dot chain line. Even in such an inclined state, the polishing pad 110 can be smoothly rotated by the action of the universal joint 100.

A cover mounting plate 123 is fixed to the lower surface of the gear box 73 by bolts 124, and a cylindrical cover ring 125 is fixed to the cover mounting plate 123 so as to surround the polishing pad 110. To prevent liquid leakage,
An O-ring 126 is attached to a contact portion between the cover mounting plate 123 and the cover ring 125. A seal rubber 127 is attached to the leading edge of the cover ring 125 over the entire circumference, and the seal rubber 127 abuts on the surface of the window glass G to be polished and cleaned, and is closed by the cover mounting plate 123 and the cover ring 125. The cavities are formed to prevent the abrasive from scattering to the outside. A brush or the like may be attached instead of the seal rubber 127 so that the tip of the brush abuts on the surface of the window glass G to prevent scattering.

In FIG. 11, 130 is an O-ring interposed between the spline shaft 88 and the toothed spline nut 84, and 131 is a V-shaped interposed between the toothed spline nut 84 and the cover mounting plate 123. A ring 132 is a V-ring interposed between the spline shaft 88 and the joint block 86 to prevent liquid leakage.

The lower part of the peripheral surface of the cover ring 125 (FIG. 11)
Opening on the right side) and the abrasive recovery joint 13
5 is attached. A collection hose (not shown) is connected to the abrasive collection joint 135, and the covering 1 after the operation is connected.
The abrasive remaining in 25 is collected through the collection hose. As shown in FIG. 10, a cap 136 is attached to the support plate 74 near the abrasive outlet 79, and the tip of the collection hose is connected to the cap during operation to prevent the abrasive from flowing out. An opening is also formed in the upper part (left side in FIG. 11) of the peripheral surface of the cover ring 125, and the release joint 137 is attached thereto. The release joint 137 allows air to enter and exit the cover ring 125 from above the cover ring 125.

As shown in FIG. 2, an air supply port one-touch coupler 150 is attached to the support frame 22, from which compressed air is supplied from the outside. The air supply port one-touch coupler 150 is connected to a motor rotation switch 151 via a pipe provided in the channel material 24, and the motor rotation switch 1
51 is connected to an air supply port of an air motor 72 via a spiral air tube 153.

As shown in FIG. 10, an air supply joint of the air motor 72 is connected to an air branch joint 154. Compressed air is directly supplied to the air motor 72 to drive the air motor 72, and the air branch joint 154 is provided. And is supplied to the air cylinder 75 side. The compressed air distributed to the air cylinder 75 side reaches the pressure reducing valve 156 via the pressing cylinder switch 155 provided near the handle 57 of the vertical slider 55 shown in FIG. Then, the compressed air whose pressure has been adjusted by the adjusting knob 157 is supplied to the extension side port 158 of the air cylinder 75. The speed control joint (see FIG. 13) is connected to the shortening port 159 of the air cylinder 75. A pressure gauge 160 indicates the pressure of the compressed air supplied to the air cylinder 75, and a silencer 161 reduces the exhaust noise of the air motor 72.

FIG. 13 is an air flow path diagram of this device. In FIG. 13, a portion surrounded by a dashed line corresponds to the main polishing and cleaning device 21. As shown in FIG. 13, a source pressure control pressure reducing valve 172 is connected to an external compressed air line 170 via a one-touch coupler 171.
In step 2, the pressure is reduced to 6 kgf / cm 2 which is necessary for the main polishing and cleaning device 21. A piping tube 174 is connected to the pressure reducing valve 172 for controlling the source pressure via a one-touch coupler 173.
The pipe tube 174 has a length (20 to 25 m) for one vehicle depending on the purpose of use of the polishing and cleaning device 21. The tip of the piping tube 174 is connected to the air supply port one-touch coupler 150 of the polishing and cleaning device 21.

In the polishing and cleaning apparatus 21, a pipe 175 communicating with the air supply port one-touch coupler 150 is branched into two branches, one of which is connected to the motor rotation switch 151. The motor rotation switch 151 is a two-way valve that switches between shutoff and communication. Motor rotation switch 15
1 reaches an air branch joint 154 via a pipe 176, and one reaches an air motor 72 via a pipe 177.

The other end is connected to the pressing cylinder switch 155 from the air branch joint 154 via a pipe 178. The pressing cylinder switch 155 is a four-way valve,
In the “OFF” state shown in FIG. 13, the pipe 178 is connected to the pipe 179 connected to the shortening port 159 of the air cylinder 75. A speed control joint 180 is interposed in the middle of the pipe 179. The speed control joint 180 is connected to the shortened port 159 of the air cylinder 75.
It controls the air flow rate when air is discharged from the air cylinder 75, and controls the speed when the drive shaft 85 of the air cylinder 75 extends (projects). When the pressing cylinder switch 155 is turned on, the pipe 178 is turned on.
Is connected to a pipe 181 connected to the extension side port 158 of the air cylinder 75. In the middle of the pipe 181, the pressure reducing valve 1
56 are interposed.

The other branch from the pipe 175 is further divided into two branches by a branch joint 182 and connected to the suction switches 28a and 28b, respectively. Suction switch 28a
And 28b are ejectors 183a and 183b, respectively.
And its vacuum outlets 184a and 184b
Are suction pads 27b, 27d, 27f and 27, respectively.
a, 27c and 27e. Suction switch 28
Reference numerals a and 28b denote three-way valves, which block compressed air in the "off" state shown in FIG. 13, and supply compressed air to the ejectors 183a and 183b when turned on. A vacuum is generated in the ejectors 183a and 183b, and the suction pads 27b, 27d, 27f and 27a, 27
Air in c, 27e27 is sucked. Here, the generated vacuum pressures of the ejectors 183a and 183b are made different,
One system is used for low-pressure adsorption, and the other system is used for high-pressure adsorption.

The operation of the polishing and cleaning apparatus 21 will be described below. First, by holding the handle 25 of the polishing and cleaning apparatus 21, the support frame 22 is aligned with the polishing target window,
Operate the suction switches 28a and 28b to operate the suction pad 2.
The support frame 22 is fixed to the vehicle by attracting 7 to the vehicle outer plate around the window. Here, the support frame 22 can be easily and accurately positioned by sequentially performing the low-pressure suction and the high-pressure suction described above. Further, since the suction pad 27 is supported by the universal joint, it is possible to firmly adhere to the suction pad 27 by inclining according to the curved surface of the vehicle outer panel.

Next, generally, the outer plate surface of the vehicle (the suction pad 2)
Since the surface position of the window glass G to be polished and cleaned has a variation of about several millimeters with respect to the surface (the surface in contact with 7), the height adjustment handle 49 of the upper and lower horizontal axis sliders 30 is rotated to raise the height of the stand 46. Is adjusted, and when the vertical axis slider 55 is moved along the vertical axis slide shaft 45, the sealing rubber 1 at the tip of the cover ring 125 of the polishing unit 70 is used.
27 is always in contact with the surface of the window glass G.

Next, the motor rotation switch 151 is turned on, and the air motor 72 is rotated. The rotation of the air motor 72 is transmitted from the spline shaft 88 to the first chain sprocket 101, the double-row chain 102, and the second chain sprocket 103, and the polishing pad 110
Rotates. Incidentally, the outer diameter of the polishing pad 110 is 100
mm, and the polishing pad 11 is
0 rotates at a peripheral speed of about 400 m / min.

Next, the supply cock 80 of the abrasive container 78 is opened and closed to supply an appropriate amount of the abrasive. The abrasive flows out from an ejection port 120 located at the center of the polishing pad 110 through an abrasive supply pipe 89 on the inner side of the spline shaft 88, and is scattered from the center to the outer peripheral portion by the rotating polishing pad 110. Thus, by supplying the polishing agent from the center of the rotating polishing pad 110, the polishing agent can be efficiently dispersed on the surface to be polished. Since the universal joint 100 can have a hollow structure, it is possible to supply an abrasive through the center thereof.

Here, in this apparatus, an abrasive supply pipe 89 is provided inside the rotating spline shaft 88 in a state insulated from the rotation of the spline shaft 88, and the abrasive is supplied through the inside of the abrasive supply pipe 89. ing. That is, since the abrasive supply pipe 89 does not rotate even when the spline shaft 88 rotates, the abrasive does not contact the rotating part until it reaches the discharge port 120. When the abrasive touches the rotating part of the machine in this type of equipment, the rotating part is shaved by the abrasive and wears out in a short time, so there is a disadvantage that parts need to be replaced. Thus, such an adverse effect can be eliminated.

Next, it was confirmed that there was no leakage of the abrasive,
The pressing cylinder switch 155 is turned on, and the air cylinder 75 is operated to push the polishing pad 110 forward and press it against the surface of the window glass G. Here, the air pressure supplied to the air cylinder 75 is adjusted in advance by operating the adjustment knob 157 of the pressure reducing valve 156 while watching the pressure gauge 160 to adjust the compressed air pressure to about 2 kgf / cm 2. By adjusting the pressure, the pressing force of the polishing pad 110 is reduced to 10
It can be changed to about kgf to 30 kgf. This pressing force is appropriately determined according to the degree and type of contamination of the window glass G.

When the operator moves the polishing unit 70 with the handle 57, the surface of the window glass G is polished and cleaned. Polishing is performed, for example, starting from the upper left corner of the window glass G, moving rightward, and polishing the polishing pad 110 at the right end.
Is moved downward, and then leftward, and this reciprocating operation is repeated. When the lowermost position is reached, one round of the periphery is finally completed. The vertical slider 5 supporting the polishing unit 70 during the movement of the polishing unit 70
5 can move smoothly within the plane of the support frame 22, and the pressing force against the window glass G is an air cylinder 75.
, The work does not require a large force, and the work can be performed with high efficiency.

When the polishing unit 70 is moved in the left-right direction, the vertical lever slider 55 is clamped to the vertical slide shaft 45 by the stopper lever 56 to restrict the vertical movement, thereby performing the operation more stably. Is possible.

That is, in this apparatus, the horizontal axis slider 30 is supported on the support frame 22 so as to be movable in the horizontal direction (first direction), and the vertical axis is movable on the horizontal axis slider 30 in the vertical direction (second direction). The shaft slider 55 is supported.
5 is equipped with a polishing unit 70. Therefore, the support frame 22 is fixed to a substantially vertical target surface, and the vertical
If the clamp 5 is clamped so as not to move in the vertical direction, the vertical axis slider 55 and the polishing unit 70 do not drop even if not supported by the operator. In this state, the operator sets the polishing unit 7
If 0 is moved right and left, the work can be performed with almost no resistance.

The surface of the window glass G is not a straight flat surface but has small irregularities and undulations. In the present apparatus, the polishing pad 110 is freely inclined with respect to the spline shaft 88 by following the unevenness and undulation of the window glass G by the universal joint 100 using the double-row chain 103, so that the polishing pad 110 Can always be pressed against the surface of the window glass G with a uniform force. Therefore, it is possible to uniformly polish the entire area of the window glass G only by moving the polishing unit 70 within the plane of the support frame 22.

In the polishing and cleaning apparatus 21, the stand 46 carrying the vertical axis slider 55 and the polishing unit 70 can be easily attached to and detached from the slide base 31 of the horizontal axis slider 30 by using the positioning pins 47. By disassembling them, they can be reduced in weight, reduced in size, transported, stored, etc., and are easy to handle.

Although the example in which the universal joint according to the present invention is suitably applied to a polishing and cleaning apparatus has been described above, the application of the universal joint is not limited to this. And so on.

[0070]

As described above, according to the present invention, there is provided a universal joint in which a rotating shaft can be inclined using a play of a chain connection, using a double-row chain. In this universal joint, the rotating shaft can be inclined within a relatively small angle range, and the driven rotating shaft can be stably rotated even in a free state. Further, since the present invention can be applied to a hollow shaft, it can be suitably used for a polishing apparatus or the like which supplies an abrasive from a central portion of a polishing pad.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a universal joint according to the present invention.

FIG. 2 is an overall front view of a polishing and cleaning apparatus according to an example of an embodiment of the present invention.

FIG. 3 is a sectional view taken in the direction of arrow A in FIG. 2;

FIG. 4 is a bottom view of the polishing and cleaning device of FIG. 2;

FIG. 5 is an explanatory diagram of a channel configuration of a suction pad of the present apparatus.

FIG. 6 is a front view of a horizontal axis slider of the apparatus.

FIG. 7 is a bottom view of a horizontal axis slider of the present apparatus.

FIG. 8 is a side view of a horizontal axis slider of the present apparatus.

FIG. 9 is a front view of a vertical slider of the apparatus.

FIG. 10 is a front view of a polishing unit of the present apparatus.

FIG. 11 is a sectional view of a main part of a polishing unit of the present apparatus.

FIG. 12 is an explanatory view showing a state where the axes of first and second chain sprockets of the present apparatus are inclined.

FIG. 13 is an air flow diagram of the present apparatus.

[Explanation of symbols]

 11, 100 Universal joint 12 Drive rotation shaft 13 Driven rotation shaft 14101 First chain sprocket 15102 Second chain sprocket 16103 Double-row chain 17, 18 Sprocket teeth 21 Polishing and cleaning device 22 Support frame 25 Handle 27 Suction pad 28a, 28b Suction Switch 30 horizontal axis slider 35 guide roller 42 stopper bolt 43 horizontal axis stopper knob 45 vertical axis slide shaft 49 height adjustment handle 55 vertical axis slider 57 handle 70 polishing unit 72 air motor 75 air cylinder 78 abrasive container 84 toothed spline Nut 88 Spline shaft 89 Abrasive supply pipe 91 Abrasive supply port 110 Polishing pad 112 Polishing cloth 125 Cover ring 127 Seal rubber

Claims (5)

[Claims] A first chain sprocket fixed to the drive rotary shaft, the first chain sprocket being interposed between a drive rotary shaft and a driven rotary shaft to transmit a rotational force; A second chain sprocket having the same diameter as the first chain sprocket fixed to the driven rotation shaft so as to be substantially coaxially opposed to the sprocket; and having the same diameter as the first and second chain sprockets. And a two-row chain formed by connecting and fixing two rows of roller chains attached to the first and second chain sprockets, respectively. 2. A drive rotary shaft, a first chain sprocket fixed to the drive rotary shaft, and the same diameter as the first chain sprocket located substantially coaxially opposite the first chain sprocket. A second chain sprocket, and two rows of roller chains which are formed in an annular shape having the same diameter as the first and second chain sprockets and which are respectively mounted on the first and second chain sprockets. And a polishing pad mechanically connected to the second chain sprocket. 3. The drive rotating shaft, the first and second chain sprockets, and the polishing pad have a hole substantially coaxially at the center thereof, and an abrasive passes through the hole to allow a polishing agent to rotate at a rotation center portion of the polishing pad. The polishing apparatus according to claim 2, wherein the polishing apparatus is supplied to the polishing apparatus. 4. A polishing apparatus, comprising: a support frame; suction means for detachably fixing the support frame to an object; and a polishing unit movably supported on the support frame in a plane. A drive rotation shaft, a first chain sprocket fixed to the drive rotation shaft, and a second chain having the same diameter as the first chain sprocket located substantially coaxially opposite to the first chain sprocket. A sprocket, and two rows formed by connecting and fixing two rows of roller chains, which are formed in an annular shape having the same diameter as the first and second chain sprockets and are respectively mounted on the first and second chain sprockets. A polishing apparatus comprising: a chain; and a polishing pad mechanically connected to the second chain sprocket. 5. The driving rotary shaft, the first and second chain sprockets, and the polishing pad have a hole substantially coaxially at the center thereof, and an abrasive passes through the hole to allow a polishing agent to rotate at a rotation center portion of the polishing pad. 5. The polishing apparatus according to claim 4, wherein said polishing apparatus is supplied to said polishing apparatus.