JPH08267703A - Hollow cylinder machining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a processing device capable of preventing shifting of a position of an engraved pattern and of forming the engraved pattern with high accuracy. SOLUTION: A hollow cylinder 1 is rotatably held by faces of both end sections of bearing devices 7, 11 disposed on a machine bed. An air is blown into an inner section of the hollow cylinder 1 via one end section thereof by an axial blower 9 to inflate it. A sealing piston 14 which is connected to the bearing device 11 provided on a side of an air supplying device 9 via at least one string element 15 moves in the inner section of the hollow cylinder 1 in an axle direction to adjust an inner pressure. The inner section of the hollow cylinder 1 is separated by the sealing piston 14 and the pressure is not applied to a side of the bearing device 7, thereby preventing the machine bed 4 from being warped as a bow. A shift between an axle of the hollow cylinder 1 and a moving axis of an optical system device is eliminated so that a pattern with high accuracy is engraved on a surface of the hollow cylinder by virtue of the optical system device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for processing a hollow cylinder, and more particularly to a device for processing the surface of a hollow cylinder while feeding high pressure air into the hollow cylinder.

[0002]

2. Description of the Related Art An apparatus for processing a hollow cylindrical member has already been proposed in European Patent Application No. 94 101 572.9. The device disclosed in the above-mentioned European patent application comprises a machine bed on which two bearing devices are supported to rotatably hold a hollow cylinder at its two end faces. The device further includes a gas supply device for feeding gas into the hollow cylinder, and the hollow cylinder has a circular cross section by expanding the hollow cylinder by an appropriate internal pressure. This gas (for example, air) is sent into the member from one end surface of the hollow cylinder. A slider that supports the optical system is further slidably attached to the machine bed. The optical system slider is movable in the longitudinal direction of the hollow cylinder, and the outer peripheral surface of the hollow cylinder is irradiated with appropriate light to process the surface of the hollow cylinder. The optical system slider has, for example, a deflecting mirror, and can deflect a laser beam directed in a direction parallel to the hollow cylinder toward the surface of the hollow cylinder. Alternatively, the laser can be attached directly to the optical system slider. In this case, the laser moves with the optical system slider. In this case, the laser beam emitted from the laser can directly impinge on the surface of the hollow cylinder,
Similarly, it can be deflected by an appropriate method by a deflection mirror arranged on the optical system slider.

The hollow cylinder mentioned here includes a member suitable for producing a stencil for screen printing. Screen-printed stencils can be used, inter alia, for printing fabrics and other suitable materials. It is also useful for halftone technology.

The hollow cylinder can be made of a thin metal foil (usually made of nickel) with holes uniformly formed on its surface. The wall thickness of the hollow cylinder is approximately 0.09 millimeters. Here, the holes formed in the metal foil are closed by a lacquer layer provided on the outer peripheral surface of the hollow cylinder. To produce the desired pattern, the lacquer layer is removed in place, thereby exposing the corresponding holes in the metal foil depending on the desired pattern. The method of removing the lacquer layer differs depending on the composition of the lacquer layer. For example, there are a method of irradiating a laser beam to burn off the lacquer layer, a method of developing after exposure with a laser beam, and the like.

When the lacquer layer is removed by exposure and development, the lacquer layer is photo-polymerized.
e) Must be able to. In general, the double bonds of the molecules present in the lacquer layer react with the chain molecules of the adjacent lacquer or resin by light irradiation. This is because the double bond was also present in the adjacent lacquer resin. Crosslinking is performed by such a reaction, and the portion is cured. Curing usually causes volume shrinkage. At the same time, the cross-linked parts have a higher chemical resistance. In the subsequent development step, this high chemical resistance is used, and the low-resistivity regions are melted out from the lacquer layer without being exposed.

In another example, a double lacquer layer can be used instead of a single lacquer layer. If a double lacquer layer is used, the layer formed directly on the cylindrical metal foil is the layer with higher light absorption. Such high light absorption can be realized by adding a large amount of light absorbing dye to the basic resin component of the lacquer layer. Then, another layer is formed on the layer having a high light absorption rate. This layer is largely transparent and generally contains a photosensitizer. Of course, it is not possible to make the second layer completely transparent, because the resin captures the photons in order to generate cross-links by light irradiation. Such light trapping initiates the photochemical process described above and eventually causes cross-linking. The double layer technique described above is particularly effective in producing a pattern having a precise and sharp contour. Since the dye layer is formed as the first layer,
The diffuse light-scattering effect of contouring can be prevented by the metal surface of the metal foil provided under this layer. The two different layers required in this example are formed sequentially. Each layer is dried after its formation.

Alternatively, a master, the surface of which can be constructed in a suitable manner, can be used as a hollow cylinder to produce a metal cylinder with holes of the type described above. In this case, the holes do not necessarily have to be formed uniformly.

The hollow cylinder type master is generally made of a thin metal sheet having no screen structure. A photosensitive layer system is formed on the outer surface of the metal cylinder. The photosensitive layer system can be constituted, for example, by a single lacquer layer or a double lacquer layer as already explained.

When machining the master, the two end faces of the master are accommodated in a circular engraving machine by means of two conical pivots. A pattern design is formed by a laser beam on the photosensitive lacquer layer. In this case, the lacquer layer can be completely removed by a laser beam. More particularly, the lacquer layer can be removed by thermal ablation with a laser beam of corresponding intensity and wavelength (eg 10.6 μm).
A CO ₂ gas laser that emits light of a wavelength is used). In addition, the lacquer layer can be removed by photolithographic removal. In this case, the wavelength is usually 32
Removed by a laser in the range 0 nm to 550 nm. In the case of photolithographic removal, the exposure and development described above can also be used to crosslink the polymerizable lacquer layer.

After processing the master as described above, a metal layer is electrodeposited on the surface of the structure obtained by the processing. For example, the nickel layer is electrodeposited in the nickel plating step of electroplating or using a chemical nickel bath. Thus, nickel is electrodeposited on the metal-free portion of the master. This creates a nickel cylinder with the desired hole pattern, which is removed from the master. If uniform holes are formed in this nickel cylinder, this can be the cylinder described above. However, by appropriate processing of the master, the configuration of the holes can be selected in another way. For example, the hole configuration can be selected to obtain a halftone engraving pattern.

FIG. 8 shows a conventional hollow cylinder processing apparatus (laser engraving machine) for processing the above-mentioned hollow cylinder. Note that the structure of the device is schematically shown in FIG.

FIG. 8 shows main forces acting on the headstock 2, tailstock 3 and machine bed 4 when the hollow cylinder 1 is filled with compressed gas such as compressed air, and further, of these forces. The deformation of the machine bed due to the action is shown. When the pressure of the air supplied to the hollow cylinder 1 is higher than the ambient pressure, the high pressure acts on the tailstock 3 and the headstock 2 of the laser engraving machine. The headstock 2 and tailstock 3
Is fixed to the machine bed 4. In this case, the tailstock 3 can move on the guide and change its position with respect to the headstock 2, so that it is possible to engage the hollow cylinders 1 of different lengths with it. However, the tailstock 3 is also fixed to the machine bed 4 during the working operation.

As can be seen from FIG. 8, the line of force acting on the inner surface generated inside the hollow cylinder 1 is the hollow cylinder 1
Coincides with the rotation axis 5 of. Headstock side end 6 of hollow cylinder 1
Is closed by a frustum-shaped bearing device (engagement portion) 7 that can be driven by a drive shaft 8 provided in the headstock 2, the magnitude of the force depends on the pressure generated in the hollow cylinder 1. And the inner cross section of the hollow cylinder 1. This force passes through the center of gravity of the inner cross section of the hollow cylinder 1, and the line on which this force acts coincides with the rotation axis 5 of the hollow cylinder 1. Here, even if the surface such as the open portion of the axial blower 9 does not seem to receive the pushing force, the tailstock 3 is acted on by the opposite force having the same magnitude as the above force. actually,
A high load is applied to the blades of the axial blower 9, and the total force acting on the axial blower 9 can be represented by the product of the pressure acting inside the hollow cylinder 1 and the open cross section of the axial blower 9. This force is further applied to the carrier 10 of the axial blower 9.
Is transmitted to the tailstock 3 via. The tailstock 3 is further acted via its closing surface by another component of the pressure acting in the hollow cylinder 1. Thus, the sum of all these forces corresponds to the product of the internal cross section of the hollow cylinder 1 and the pressure accumulated inside the hollow cylinder.

A bearing device 11 is further rotatably attached to the tailstock 3 and supports the other end of the hollow cylinder 1. The bearing device 11 has an annular shape and has a duct in the center. Air is sent into the hollow cylinder 1 from this duct.

The internal pressure required for the cylinder to form a substantially circular cross-sectional shape needs to be higher the larger the wall thickness of the hollow cylinder 1 clamped in the circle. Here, the master is convenient for the electroforming process of the screen printing stencil in the subsequent process, but various stresses are applied to the master. For example, electrocasting baths are subject to bending stress as a result of hydrostatic lifting forces. Therefore, the wall thickness of the master is usually larger than the wall thickness of the stencil for screen printing (about 2 mm).
Double to triple). Therefore, a higher pressure than the stencil must be used to expand the master into a circle.

[0016]

When using a substantially closed hollow cylinder, the following problems occur due to the force that pushes the end face inside the cylinder. That is, the two bearing devices coupled to the machine bed are urged away from each other, resulting in bowing of the machine bed when the bearing device is fixed to the machine bed. On the other hand, since the optical system device is also supported on the machine bed, the position of the optical system device with respect to the hollow cylinder is also displaced due to the bowing of the machine bed as described above. As a result, it becomes impossible to generate a very precise pattern on the surface of the hollow cylinder.

Specifically, when a hollow cylinder of the type described above is clamped by the device shown in FIG. 8 and subjected to internal pressure, a bending moment acts on the machine bed 4. This bending moment is the total force applied to the tailstock or headstock,
It is the product of the distance 12 between the axis of rotation 5 of the hollow cylinder and the axis 13 passing through the center of gravity of the cross section of the machine bed 4. This bending moment causes the machine bed 4 to bend upward in the region between the headstock 2 and the tailstock 3. Due to the size of the engraving machine as a whole, such deformation is extremely small, but this deformation causes the slider for engraving, that is, the optical system slider (not shown) to be attached to the machine bed 4 for guiding. The guide thus formed is curved with respect to the rotation axis 5 of the hollow cylinder 1. As a result, the guide is also displaced with respect to the surface generatrix of the hollow cylinder 1. Such a shift cannot be neglected especially in the case of delicate engraving work.

An object of the present invention is to provide an apparatus for processing a hollow cylinder as described below. That is, it is a hollow cylinder processing apparatus that can generate a highly accurate pattern on the surface of the hollow cylinder by light irradiation even when the inside of the hollow cylinder is filled with high pressure and the machine bed is not so strong.

[0019]

In order to achieve the above object, the first aspect of the present invention is to provide two bearing devices supported on a machine bed and rotatably holding a hollow cylinder through both end faces thereof. A gas supply device for sending gas from one end face of the hollow cylinder to the inside thereof, and an optical system device for irradiating the outer surface of the hollow cylinder with light to perform processing, on a machine bed in the length direction of the hollow cylinder. A hollow cylinder machining device including an optical system device that is guided and moved, and that is engaged with a bearing device provided on the gas supply device side and moves in the hollow cylinder in the axial direction to move the hollow piston inside. A pressure-regulating sealing piston and at least one string-like element for moving said sealing piston.

Since the sealing piston is provided inside the hollow cylinder, the bearing device provided on the side of the sealing piston that does not face the gas supply device does not receive pressure. On the other hand, due to the gas pressure inside the hollow cylinder,
Substantially equal and opposite forces act on the bearing element provided on the gas supply device side. However, the force exerted on the sealing piston acts on the bearing device on the side of the gas supply device because of the string-like element, so that the force exerted on this bearing device is substantially zero. As a result, the two bearing devices holding the hollow cylinder are not biased away from each other, i.e. no bowing of the machine bed occurs in the central region between the two bearing devices. Therefore, by using an optical system device that is firmly fixed to the machine bed, it is possible to form an accurate pattern on the surface of the hollow cylinder. Here, the tailstock or the headstock may be treated as a bearing device.

In order to achieve the above object, a second invention is the hollow cylinder machining apparatus according to the first invention, wherein the sealing piston is provided with a string-shaped element extending along a longitudinal axis of the hollow cylinder. Is engaged with the bearing device.

In order to achieve the above object, a third aspect of the present invention is the hollow cylindrical machining device according to the first or second aspect of the present invention, wherein the string-shaped element can be wound around a rope drum fixed to the bearing device. It is characterized by being a rope.

In order to achieve the above object, a fourth invention is characterized in that, in the hollow cylindrical machining device of the third invention, the rope is guided to a rope drum through a deflection pulley.

In order to achieve the above object, a fifth aspect of the present invention is the hollow cylindrical machining device according to any one of the first, second, third, and fourth aspects of the invention, wherein the string-shaped element is moved in the longitudinal direction. Is performed by a stepping motor.

According to this structure, the sealed piston and the bearing device on the side of the gas supply device can be connected so that the transverse force is not transmitted from the sealed piston to the bearing device as much as possible. Further, the sealed piston can easily move in the length direction of the cylinder. That is, in the direction away from the bearing device on the gas supply device side, it moves due to the pressure inside the hollow cylinder, and the rope follows this. Furthermore, the rope is moved toward the gas supply device by winding the rope around the rope drum.

[0026] Preferably, the hermetic piston is, in its operation, due to internal pressure and following movement of the rope.
It is moved as close as possible to the bearing device facing the bearing device provided on the gas supply device side. However, in this case, the sealed piston should not come into contact with this bearing device. In this way, the hollow cylinder can be expanded as much as possible over its length and provide a circular cross section.

The hollow cylinder has a
When the peripheral surface is opened by the irradiation of light impinging on the surface, the sealing piston can be moved as follows. That is, the area of the cylinder left between the moved piston and the bearing device of the gas supply device is completely closed, or only a few rows of holes of the hollow cylinder are opened. The sealed piston can be moved. In this way, a high output gas pressure generator is not required to inflate the hollow cylinder. in this case,
The sealed piston may be moved according to the movement of the optical device in the longitudinal direction. The cylinder can also illuminate either the front-rear part of the sealing piston or the area of the sealing piston.

In order to achieve the above object, a sixth aspect of the present invention is the hollow cylinder machining apparatus according to any one of the first, second, third, fourth and fifth aspects, wherein the same side as the gas supply device is provided. The bearing device supporting the provided hollow cylinder is characterized in that it comprises a receptacle which engages with the sealing piston.

According to this configuration, when the sealing piston is guided until it reaches the position of the bearing device on the gas supply device side, the sealing piston engages with this receptacle and is attracted to the receptacle by the string-shaped element. As a result, the hermetic piston is firmly fixed to the receptacle. The sealing piston is thus connected to this bearing device even when the hollow cylinder is removed.

In order to achieve the above object, a seventh invention is the hollow cylindrical machining device according to any one of the first, second, third, fourth, fifth and sixth inventions, wherein the sealing piston is , Via a ball bearing, attached to a central tie connected to the string-like element.

According to this structure, not only the sealing piston can rotate together with the cylinder, but also the twisting of the string-like element can be effectively prevented.

In order to achieve the above object, an eighth invention is the hollow cylindrical machining apparatus according to any one of the first, second, third, fourth, fifth, sixth and seventh inventions, wherein: The gas supply device is characterized in that it is an axial blower arranged coaxially with the bearing device that supports the hollow cylinder.

In order to achieve the above object, a ninth invention is the hollow cylindrical machining apparatus according to any one of the first, second, third, fourth, fifth, sixth and seventh inventions, wherein: The gas supply device is composed of a compressed air generator provided outside the processing device, and a nozzle provided inside the bearing device that supports the hollow cylinder and is connected to the compressed air generator. And

According to this structure, the gas can be efficiently sent into the hollow cylinder to expand the hollow cylinder. The compressed air generator is connected to, for example, a compressed air network.

In order to achieve the above-mentioned object, a tenth invention is a hollow structure according to any one of the first, second, third, fourth, fifth, sixth, seventh, eighth and ninth inventions. In the cylindrical processing device, the sealed piston moves in synchronization with the movement of the optical system device in the longitudinal direction.

According to this structure, it is possible to irradiate light to an optimum position on the surface of the hollow cylinder that maintains the expanded state of the hollow cylinder suitable for processing by the optical system device, and generate a highly accurate pattern.

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. Similar to FIG. 8, FIG. 1 shows the main forces acting on the headstock 2, tailstock 3, and machine bed 4 when the hollow cylinder 1 is filled with compressed gas such as compressed air. . In FIG. 1, the hollow cylinder 1 is provided with a sealing piston 14 which is movable in the axial direction inside thereof. The sealing piston 14 seals the inner wall of the hollow cylinder and transfers the force exerted on the sealing piston to the tailstock 3 by means of a string-like element 15 (here a rope). Such a configuration ensures that no bending moment acts on the machine bed 4. The force of the cord element 15, ie the rope force 16, acts as a tailstock pull. This pull is a force 1 applied to the tailstock 3.
A force equal to the sum of 7 and in the opposite direction. For this purpose, it is necessary to prevent lateral forces from being transmitted to the tailstock 3 via the string-like element 15, i.e. the rope. For this reason, the string-like element 15 or rope must extend at least substantially in the direction of the axis of rotation of the hollow cylinder 1 and its position. And
The rope is guided around the first deflection pulley 18 and the second deflection pulley 19 and wound around the rope drum 20. Or it will be unwound from now on. Of course, the movement of the string-like element 15 may be slightly deviated from the position of the rotating shaft 5 depending on the design and strength of the machine bed 4, but when the curve of the deformed machine bed 4 exceeds a certain limit value. However, this effect is noticeable in the engraving pattern.

In FIG. 1, the urging force acting on the sealing piston 14 is designated by reference numeral 21. On the other hand, the bearing device 1
1 has an end face receptacle 22. The end face receptacle 22 engages the sealing piston 14 when the sealing piston 14 is fully moved to the tailstock 3. For this reason,
Even if the hollow cylinder 1 is removed from the processing device, the sealing piston 14 remains fixed to the receptacle 22 of the bearing device 11.

As described above, the headstock 2 and the tailstock 3 which hold the hollow cylinder 1 are not biased in the direction of moving away from each other, that is, in the central region between the headstock 2 and the tailstock 3. The phenomenon that the machine bed 4 warps like a bow does not occur. Therefore, by using an optical system device firmly fixed to the machine bed 4, it is possible to form an accurate pattern on the surface of the hollow cylinder.

FIG. 2 is a perspective view showing the whole of a concrete apparatus of the embodiment according to the present invention. Reference numeral 23 is a thin hollow cylinder and represents a lacquer-coated master or a lacquer-coated cylindrical screen. The hollow cylinder 23 is supported at its two open ends. That is, the support cone 25 as the bearing device is engaged with the end portion on the tailstock side, and the support cone 26 as the bearing device is engaged with the end portion on the headstock side. A rotary drive device for rotating the hollow cylinder 23 is provided in the headstock 27. Air is introduced into the hollow cylinder 23 via a hollow shaft 28 provided on the tailstock 29. The pressure of the air fed into the interior of the hollow cylinder is increased slightly above ambient pressure in a suitable manner. For supplying this air, for example, a radial blower 30 is provided. The radial blower 30
Compressed air is supplied to the hollow shaft 28 via an air tube 31. The slider 32 moves in the axial direction of the hollow cylinder 23 while the hollow cylinder 23 rotates. The rotary solid-state laser 24 is attached to the slider 32, and the switch of the solid-state laser 24 is turned on / off according to the information of the engraving pattern. The light beam emitted by the laser 24 is applied to the hollow cylinder 23 via the deflection mirror 24a. The slider 32 is driven by the spindle 33. The spindle 33 has a stepping motor 3 attached to its flange portion.
4 Guide 35 fixed to the machine bed 4
Has a role of guiding the slider 32 accurately in parallel. The rotation angle transmitter 38 (encoder) detects the angular position of each hollow cylinder 23 from the data line 37.
To the computer 36 via. Computer 36
Sends a stepping pulse to the stepping motor 34 and a switch on and switch off command to the solid state laser 24 via a control unit (not shown).

The tailstock 29 is placed on a guide 39,
It can be moved in the length direction of the hollow cylinder 23. In this way, the position of the tailstock 29 can be adjusted for hollow cylinders of different lengths. Furthermore, the hollow cylinder 23
The tailstock 29 can be displaced away from the hollow cylinder in order to replace it. Thus, the hollow cylinder 23
Can be pulled back and easily removed from the device.

3 and 4 are a side view and an elevation view showing one design of the tailstock 29. The tailstock 29 has a base plate 67. Since the base plate 67 is connected to the end plate 40 and the sheet metal casing 66 that covers the tailstock 29 with respect to the outside, a very strong structure can be obtained. The end plate 40 has screws 42
The rigid bearing sleeve 41 is fixed by. The rigid bearing sleeve 41 holds the ball bearing 43. The two ball bearings are spaced by a thrust ring 44 and a sleeve 45 and are biased by a groove nut 46 against a collar 47 on the rigid bearing sleeve 41. Ball bearing 43
Supports a rotatable support sleeve 48. The ring 49 prevents the support sleeve 48 from moving in the axial direction. A replaceable support cone 25 is fixed to the support sleeve 48. The support cone 25 is biased against the collar of the support sleeve 48 via the spacer sleeve 51 and the groove nut 50. Since the support cone 25 is replaceable, when the hollow cylinders 23 having different inner diameters are clamped, it is possible to replace it with a support cone having a different size according to the inner diameter. The pressurized gas supplied by the axial blower 53 fills the inside 52 of the hollow cylinder 23. This pressurized air pressure is approximately 5 to 50 mbar above the normal external air pressure. However, if the pressure is considerably higher than the normal pressure, it cannot be generated by the axial blower. A sealing ring 72 is supplied so that air does not leak from the inside 52 of the hollow cylinder 23 through the ball bearing 43. Furthermore, a sealing piston (details of which will be shown later) is provided inside the hollow cylinder 23.
Since the pressurized gas in the inside 52 of the hollow cylinder 23 acts on the hermetic piston against this, the hermetic piston is the rope 56.
Must be held in its axial position by. The rope 56 is guided by the deflection pulleys 57 and 58 while being displaced from the center position of the hollow cylinder along the rotation axis 5, so that the axial blower 53 can be avoided. The rope 56 passes through the slot 70 provided in the end plate 40 and is wound around the rope drum 59. The deflecting pulleys 57, 58 have a rigid bearing sleeve 41.
Rotate around the axis provided above. The clamp 60 is
Hold the end of the rope on the rope drum 59. The rope drum 59 is held together with the worm wheel 62 on the shaft 61 supported by the bearing structure 65. The worm 63 connected to the stepping motor 64 drives the worm wheel 62. When the rope 56 is wound or unwound, the rope 56 moves in the axial direction of the shaft 61. To ensure a reliable guide of the rope 56, the rope groove of the deflection pulley 58 is shaped to correspond to the depth of the rope. The axial blower 53 is held on a mounting ring 55 by struts 54, and the mounting ring 55 is mounted on the end plate 40 by screws. Furthermore, if a higher pressurized gas has to be supplied, the axial blower 53 can also be designed as a multi-stage blower.

In addition to the force for supporting the hollow cylinder 23, a force acting on the inside 52 of the hollow cylinder and a force in the length direction of the rope 56 act on the tailstock 29. Since the internal force and the longitudinal force of the rope cancel each other out, only the tailstock 29 is elastically deformed by these forces, and the machine bed is not deformed. As a result, the elastic hollow cylinder 2
The deviation of 3 is minute, and extremely precise engraving is possible.

FIG. 5 shows another structure of the tailstock 29. Here, the gas supply to the hollow cylinder interior 52 is done by connecting a compressed air network attached to the outside of the device to the device. Air from this network flows through a flexible conduit 68 and through a pressure reducer and filter (not shown) to a nozzle 69 located at the end plate 40 and into the interior 52 of the hollow cylinder. The rope 56 is guided through a slot 70 located in the center of the cylindrical cross section, again here the rope drum 59.
It is taken up by and is unwound from here. The rope drum 59 is driven by a stepping motor 64 via a spur gear 71. A retaining ring 73 is attached to hold the sealing piston when it reaches its end position and is fully drawn by the rope 56 to a position against the tailstock 29. Retaining ring 73
The (receptacle) is firmly fixed to the open end of the support sleeve 48.

The aforementioned sealing piston 74 is shown in FIG. The sealing piston 74 is composed of a replaceable receiving ring 75 arranged on the left side of the drawing, an extremely thin and light center ring 76, and a ring cap 77 located on the right side of the drawing. This closed piston (ring structure)
74 must correspond to each size of hollow cylinder 23. For this reason, the ring structure is detachably held by the central bearing housing 78 by the screw 79 so that the ring structure can be replaced. Central bearing housing 78
Rotates with this ring structure 74 and the hollow cylinder 23. Therefore, the central bearing housing 78 has a ball bearing 80.
Is supported by a fixed body 81 that does not rotate. The sealing ring 82 allows the hollow cylinder 23 in the presence of high pressure.
It is guaranteed that there is no air leakage from the interior 52 of the. Similarly, in order to prevent air leakage, the clearance between the receiving ring 75, the center ring 76, the ring cap 77 and the hollow cylinder 23 is also extremely small. Naturally, the hollow cylinder 2
It is not possible to completely prevent the leakage of air from the inside 52 of 3. Therefore, it is effective to supply the pressurized gas used to keep the cross section of the hollow cylinder 23 circular by an axial blower or a radial blower. This is because the axial blower or the radial blower has a slight decrease in the delivery characteristic with respect to the supplied air amount.

Even if the hollow cylinder 23 is a pre-perforated annular screen and the engraving of the screen is carried out by removal of the lacquer layer provided on its outer surface, the use of the sealing piston 74 described above. You can In this case, the orifice of the annular screen would not be blocked, so without the sealing piston 74 a very large amount of air would leak and a high compression force would have to be used. Therefore, the compressed piston to be supplied can be considerably reduced by separating the already engraved portion of the annular screen from the portion of the hollow cylinder 23 filled with the pressurized gas by the sealing piston 74. In this case, the engraving work is started from the side where the headstock 27 is located. The slider 32, solid laser 24, and mirror 2 that form the engraving head.
As 4a advances toward the tailstock 29, the hollow cylinder (annular screen) 23 portion appears larger. The sealing piston 74 moves inside the annular screen 23 approximately in synchronization with such advancement of the engraving head.

In the present invention, the following proof has been made regarding the concern that the concentric and stable movement may be impaired in the screen cylinder in which the air pressure is only partially filled. That is, it is confirmed that even a screen cylinder whose atmospheric pressure is filled only in a portion corresponding to half or one-third of the total length exhibits excellent concentric motion characteristics at the engraving position. Was done.

The sealing piston 74 is used even when air leakage does not occur during engraving of the annular screen.
This is the case when the lacquer layer is crosslinked but not removed by the laser beam engraving operation, and the uncrosslinked lacquer layer is only removed in a subsequent step (ie the development process). This working process does not affect the accuracy of the position of the engraving pattern. This manufacturing process is more costly but is preferred for fine engraving. This is because a laser beam having a shorter wavelength can be used, so that the focal diameter of the irradiation light becomes smaller. However, here again, a precise concentric movement of the screen is required. Therefore, by filling the inside of the screen with the pressurized gas, it is possible to meet such a demand.

FIG. 7 shows a hollow cylinder 23 from the headstock 27 side.
FIG. 8 is a diagram showing a structural design of the headstock 27 when high-pressure air is supplied to the interior 52 of FIG. The drive shaft 83 that drives the hollow cylinder 23 is designed as a hollow shaft, and is rotatably attached to the headstock housing 91 via a ball bearing 43. The toothed belt wheel 85 rests on the drive shaft 83 and is fixedly connected thereto. A toothed belt 86 is engaged with the toothed belt wheel. The flange disc 87 prevents the toothed belt 86 from sliding laterally and coming off. The end plate 40 supports a ring bearing housing 95, to which the right ball bearing 43 is attached. The ball bearing 43 is held by a holding disk 96. The blower wheel 84 rotates within the open interior of the drive shaft 83, increasing the pressure within the interior 52 of the hollow cylinder 23. The blower wheel 84 is attached to the bell-shaped shaft 92 together with the V-shaped belt pulley 93. V
The belt belt 94 drives the bell-shaped shaft 92 and the blower wheel 84. The rope 56, which holds and moves the sealing piston 74, is guided through a bell-shaped shaft 92 to a deflection pulley 57 and from there to a rope drum 59 in a known manner. Rope drum 59
Is driven similarly to the rope drum in FIGS. The bell shaft 92 is attached to the hollow shaft stub 88 by two ball bearings 43. Deflection pulley 5
7 is supported in this hollow shaft stub 88 by a shaft 89. The hollow shaft stub 88 is a headstock housing 91.
Is fixed to the left side plate 90. In addition, the same members as those in FIGS. 3 and 4 are denoted by the same reference numerals, and the description thereof will be omitted.

[0050]

As described above, according to the present invention, two bearing devices for holding both ends of the hollow cylinder and the main shaft are provided by the sealing piston provided inside the hollow cylinder and connected to the string-like element. The platform and tailstock have no force to push them. As a result, the two bearing devices are not subjected to forces in a direction away from each other, that is to say that the machine bed does not bow in the area between the two bearing devices. This makes it possible to form a more accurate pattern on the surface of the hollow cylinder.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a configuration of a hollow cylinder processing device according to the present invention, and is a conceptual diagram showing a state where pressure is applied to a hollow cylinder.

FIG. 2 is a perspective view showing an entire hollow cylindrical machining device according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a tailstock portion of a hollow cylindrical processing device according to an embodiment of the present invention.

4 is a cross-sectional view in a direction orthogonal to the cross section of FIG.

FIG. 5 is a cross-sectional view of a tailstock portion of a hollow cylindrical machining device according to another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a state in which a pressure piston is arranged inside the hollow cylinder of the hollow cylinder processing device according to the embodiment of the present invention.

FIG. 7 is a sectional view of a headstock portion of a hollow cylindrical machining device according to another embodiment of the present invention.

FIG. 8 is a diagram showing a conventional hollow cylinder processing device, and is an explanatory diagram illustrating a state in which pressure is applied to the hollow cylinder.

[Explanation of symbols]

1,23 hollow cylinder, 2,27 headstock, 3,29 tailstock, 4 machine bed, 7,11,25,26 bearing device, 14,74 sealed piston, 15 string element, 18,19,57, 58 deflection pulley, 20, 59
Rope drum, 9,53 axial blower, 64 stepping motor, 69 nozzles.

Claims (10)

[Claims] 1. A bearing device which is supported on a machine bed and rotatably holds a hollow cylinder through both end faces thereof, and a gas supply device which feeds gas into the inside from one end face of the hollow cylinder, An optical system device for performing processing by irradiating the outer surface of the hollow cylinder with light, the optical system device being guided and moved on a machine bed in the length direction of the hollow cylinder. A sealing piston that engages with a bearing device provided on the gas supply device side, moves axially inside the hollow cylinder to adjust the pressure inside the hollow piston, and at least one sealing piston that moves the sealing piston. A hollow cylindrical machining device comprising: a string-shaped element; 2. The hollow cylinder machining device according to claim 1, wherein the sealing piston is engaged with the bearing device via a string-shaped element extending along a longitudinal axis of the hollow cylinder. A hollow cylindrical machining device characterized by. 3. The hollow cylindrical machining device according to claim 1, wherein the string-shaped element is a rope that can be wound around a rope drum fixed to the bearing device. apparatus. 4. The hollow cylinder processing device according to claim 3, wherein the rope is guided to a rope drum via a deflection pulley. 5. Claim 1 or claim 2 or claim 3.
Alternatively, in the hollow-cylindrical processing apparatus according to claim 4, the step of moving the string-shaped element in the longitudinal direction is performed by a stepping motor. 6. Claim 1 or claim 2 or claim 3.
Alternatively, in the hollow-cylindrical processing device according to claim 4 or 5, the bearing device that supports the hollow cylinder provided on the same side as the gas supply device includes a receptacle that engages with the sealing piston. Cylindrical processing equipment. 7. Claim 1 or claim 2 or claim 3.
Alternatively, in the hollow cylindrical machining device according to claim 4 or claim 5 or claim 6, the sealed piston is attached to a central fixed body connected to the string-like element via a ball bearing. Cylindrical processing equipment. 8. Claim 1 or claim 2 or claim 3.
Alternatively, in the hollow cylinder processing apparatus according to claim 4, claim 5, claim 6, or claim 7, the gas supply device is an axial-flow blower that is arranged coaxially with a bearing device that supports the hollow cylinder. A hollow cylinder processing device characterized in that 9. Claim 1 or claim 2 or claim 3.
Alternatively, in the hollow cylinder processing apparatus according to claim 4, claim 5, claim 6, or claim 7, the gas supply device includes a compressed air generator provided outside the processing device, and the compressed air generator. A hollow cylinder processing device, comprising: a nozzle provided inside a bearing device that is connected and supports the hollow cylinder. 10. A hollow cylindrical machining apparatus according to claim 1, 1 or 2, 3 or 4, 5 or 6, or 7 or 8 or 9, wherein the sealing is performed. The hollow cylinder machining device characterized in that the piston moves in synchronization with the movement of the optical device in the longitudinal direction.