JP2008159491A - Tube processing device and lamp manufacturing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tube processing device capable of forming a diameter-reduced part on a continuously moving glass tube with a relatively simple structure, and thereby improving production efficiency without increasing cost related to manufacturing equipment; and a lamp manufacturing device. <P>SOLUTION: This tube processing device 31 includes a transport means transporting glass tubes 11, burners 39A and 39B as heating means, and pairs of rotating rollers 40A and 40B. The burners 39A and 39B are arranged along a path for transporting the glass tubes 11 therethrough, and heat respective predetermined parts of the glass tubes 11. The pair of rotating rollers 40A and 40B is arranged to sandwich the respective predetermined parts of the glass tubes 11 brought into a softened state by being heated by the burners 39A and 39B, and the distance between the pair of rotating rollers 40A, 40B is set smaller than the width of the glass tube 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to a technical field including a tube processing device and a lamp manufacturing device for reducing the diameter of a glass tube to form a lamp.

  For example, a cold cathode fluorescent lamp (CCFL) is used as a light source for a backlight of a liquid crystal display device or the like. In general, such a fluorescent lamp has a phosphor layer formed at a predetermined portion on the inner peripheral surface, and is sealed at both ends of a bulb portion into which an inert gas and mercury vapor are introduced, and the bulb portion. And an electrode mount for emitting a high voltage in the bulb portion.

  A cold cathode fluorescent lamp is manufactured as follows, for example. First, a glass tube having a phosphor layer formed on a predetermined portion of the inner wall surface is prepared. The phosphor layer is formed by firing a fluorescent coating applied to the inner wall surface of the glass tube. Next, the mount is sealed at one end of the glass tube. More specifically, the mount includes an electrode portion, a lead wire extending from the electrode portion, and a glass bead provided on the base end side of the lead wire, and the glass tube and the bead are welded to each other. Sealed. Subsequently, two reduced diameter portions are formed on the other end side of the glass tube. Another mount is temporarily fixed to the reduced diameter portion located on one end side of the glass tube among the two reduced diameter portions, and the mercury alloy member is inserted into the reduced diameter portion located on the other end side.

  And an inert gas is introduce | transduced, exhausting the inside of a glass tube. At this time, the glass tube is heated in order to further improve the discharge efficiency of impurities. Thereafter, the glass tube is gradually cooled, and the other end of the glass tube is sealed.

  Then, in another apparatus, mercury vapor is released into the glass tube by performing high-frequency heating. Then, the remaining mount that has been temporarily fixed is sealed. More specifically, in a state where the glass tube is positioned at a predetermined position, the outer periphery of the reduced diameter portion of another mount that is temporarily fixed is heated and welded to each other, and then unnecessary portions, that is, mercury alloy members are present. The site is excised. Through such a series of steps, a cold cathode fluorescent lamp as a lamp is obtained. Of course, the above procedure is merely an example.

  Here, the reduced diameter portion formed to temporarily fix the mount or the mercury alloy member is formed as follows, for example. That is, first, a predetermined portion of the glass tube is heated by a heating means such as a burner. Next, the glass tube is moved from the heating means to a pair of pressing means (for example, a pinch), and then the predetermined portion that has been softened by heating is sandwiched and pressed by the pair of pressing means after being temporarily stopped. Thereby, the said predetermined site | part is pressurized and deform | transformed and a reduced diameter part is formed (for example, refer patent document 1).

By the way, in recent years, in order to improve production efficiency, it is required to increase the speed of the production line. Thus, it is conceivable to increase the speed of the production line by reducing the diameter while continuously moving the glass tube. Specifically, it is conceivable that the holding means for holding the glass tube is continuously moved so that the glass tube is continuously moved, and the glass tube being moved is further reduced in diameter using the above technique.
JP-A-8-273614

  However, the technical idea described in the above publication is that the glass tube is temporarily stopped and then pressed by the pressing means. For this reason, if the glass tube is pressed without stopping the glass tube, an excessive load is generated on the glass tube, and the glass tube may be damaged.

  On the other hand, for example, it is conceivable to press the glass tube with the pressing means while moving the pressing means in accordance with the moving speed of the glass tube, and to return the pressing means to the initial position after pressing. That is, by providing a moving mechanism for moving the pressing means, it is conceivable to form the reduced diameter portion without causing damage to the glass tube while continuously moving the glass tube. However, when such a moving mechanism is provided, the manufacturing facility may be significantly complicated, and the cost related to the manufacturing facility may be increased.

  The present invention has been made in view of the above circumstances, and an object thereof is to produce a reduced diameter portion in a continuously moving glass tube with a relatively simple configuration, and without causing an increase in costs related to manufacturing equipment. An object of the present invention is to provide a tube processing apparatus and a lamp manufacturing facility capable of improving efficiency.

  Hereinafter, each means suitable for solving the above-described object will be described in terms of items. In addition, the effect specific to the means to respond | corresponds as needed is added.

Means 1. A tube processing apparatus for reducing the diameter of a glass tube for forming a lamp,
Holding means for holding the glass tube;
A transporting means for transporting the glass tube held by the holding means by moving the holding means;
A heating means arranged along a path along which the glass tube is conveyed, and heating a predetermined portion of the glass tube;
A pair of rotating rollers arranged to sandwich the predetermined portion of the glass tube,
The distance between the pair of rotating rollers is narrower than the width of the glass tube,
Forming the reduced diameter portion at the predetermined portion of the glass tube that has been softened through the heating means by passing between the pair of rotating rollers by the glass tube conveyed by the conveying means; A tube processing device.

  The “width of the glass tube” is the outer width of the glass tube, and indicates the outer diameter when the cross section of the glass tube is circular (hereinafter the same).

  According to the means 1, the tube processing apparatus includes a heating unit that heats a predetermined part of the glass tube, and a pair of rotating rollers that are arranged so as to sandwich the predetermined part of the glass tube, The interval is made narrower than the width of the glass tube. Thereby, a reduced diameter part (constriction part) can be formed in the said predetermined part of the glass tube which became the softened state by the heating means because a glass tube passes between a pair of rotating rollers. Further, it is not necessary to provide a pressing means for sandwiching and pressing the glass tube by moving itself, and the reduced diameter portion can be automatically formed in the course of transporting the glass tube without stopping the glass tube. For this reason, it is possible to form the reduced diameter portion while transporting the glass tube with a relatively simple configuration without providing a conventional pressing means or a moving mechanism for moving the pressing means in accordance with the movement of the glass tube. As a result, it is possible to improve production efficiency by speeding up the production line, simplify production equipment, and suppress cost increase.

  In addition, when the glass tube is pressed by the pressing means, there is a concern that the amount of the reduced diameter portion entering the radial inner side of the glass tube may increase or decrease excessively due to the effect of the stroke amount of the pressing means. However, according to this means 1, if a pair of rotating rollers are installed, a reduced diameter portion with a constant penetration amount can be stably formed only by moving the glass tube along a predetermined path. it can.

Mean 2. A tube processing apparatus for reducing the diameter of a glass tube for forming a lamp,
Holding means for holding the glass tube;
Conveying means for conveying the glass tube held by the holding means so as to continuously move by moving the holding means;
A heating means for heating a predetermined portion of the glass tube which is arranged along a path along which the glass tube is conveyed and is continuously moved;
A pair of rotating rollers arranged to sandwich the predetermined portion of the glass tube,
The distance between the pair of rotating rollers is narrower than the width of the glass tube,
Forming the reduced diameter portion at the predetermined portion of the glass tube that has been softened through the heating means by passing between the pair of rotating rollers by the glass tube conveyed by the conveying means; A tube processing device.

  According to the means 2, basically the same effect as the means 1 is obtained. In addition, the means 2 is configured to heat while moving the glass tube. Therefore, the glass tube can be continuously moved without stopping throughout the entire process of forming the reduced diameter portion in the glass tube. As a result, the production line can be further increased in speed, and the production efficiency can be dramatically improved.

  Means 3. The pipe machining apparatus according to means 1 or 2, wherein the pair of rotating rollers are supported so as to be freely rotatable.

  Even when the pair of rotating rollers are supported so as to be freely rotatable as in the above-described means 3, the reduced diameter portion is formed by passing the glass tube between the pair of rotating rollers. That is, it is not necessary to provide a special drive source for rotating the rotating roller. Thereby, the further simplification of a manufacturing facility and the further suppression of the increase in cost can be aimed at.

  Means 4. 4. The means according to claim 1, wherein the predetermined portion has a plurality of locations along the longitudinal direction of the glass tube, and the pair of rotating rollers are provided corresponding to the predetermined portions. Pipe processing equipment.

  According to the above means 4, it is possible to form the reduced diameter portions simultaneously or substantially simultaneously at a plurality of predetermined sites along the longitudinal direction of the glass tube. Therefore, the production efficiency can be further improved.

  Means 5. Means 1 to 1, wherein an interval between the pair of rotating rollers can be adjusted by enabling at least one of the pair of rotating rollers to move in a direction in which the pair of rotating rollers approach or separate. 4. The tube processing apparatus according to any one of 4 above.

  According to the means 5, at least one of the pair of rotating rollers is configured to be movable, and the interval between the pair of rotating rollers can be adjusted. Thereby, a reduced diameter part can be formed corresponding to the various glass tubes which have a different width | variety. In addition, the amount of the reduced diameter portion entering the radially inner side of the glass tube can be adjusted in consideration of the application of the reduced diameter portion.

Means 6. The pair of rotating rollers has a plurality of protrusions protruding at predetermined intervals in the outer circumferential direction,
When the glass tube passes between the pair of rotating rollers, the convex portion of one rotating roller of the pair of rotating rollers and the convex portion of the other rotating roller sandwich the glass tube. 6. The pipe machining apparatus according to any one of means 1 to 5, further comprising synchronous rotating means for rotating the pair of rotating rollers in a synchronized manner so as to face each other.

  According to the means 6, the pair of rotating rollers has a plurality of protruding portions protruding in the outer circumferential direction at predetermined intervals, and the protruding portion of one rotating roller and the protruding portion of the other rotating roller are It is rotated synchronously so as to face each other. That is, the reduced diameter portion is locally formed in the glass tube by being sandwiched between the convex portions from both sides. Therefore, the mount and the mercury alloy member can be temporarily fixed, and the mount and the mercury alloy member can be prevented from falling off. On the other hand, the reduced diameter portion is formed so as to be pinned. Can be secured as widely as possible. Therefore, exhaust in the glass tube and gas introduction can be performed efficiently.

Mean 7 The pair of rotating rollers has a plurality of protrusions protruding at predetermined intervals in the outer circumferential direction,
When the glass tube passes between the rotating rollers,
A first convex portion formed on one rotating roller of the pair of rotating rollers and a second convex portion formed on the other rotating roller are upstream of the conveying direction of the glass tube. Facing each other across the location,
And formed on the one rotating roller, formed on the third rotating portion adjacent to the first protruding portion and positioned on the downstream side in the conveying direction of the glass tube, and on the other rotating roller, Adjacent to the second convex portion and the fourth convex portion located downstream in the transport direction of the glass tube are opposed to each other across a portion of the glass tube located downstream in the transport direction. Comprising synchronous rotating means for synchronizing and rotating the pair of rotating rollers,
6. The tube processing apparatus according to any one of means 1 to 5, wherein the reduced diameter portion is formed at the predetermined portion by the first to fourth convex portions.

  According to the means 7, basically the same operational effects as the means 6 are obtained. In addition, when the glass tube passes between the pair of rotating rollers, a portion of the glass tube located upstream in the conveying direction and a portion located downstream in the conveying direction protrude from both sides. It is sandwiched between parts. That is, the glass tube is sandwiched by a total of four convex portions, and as a result, a reduced diameter portion composed of four concave portions is formed in the glass tube. Thereby, a mount and a mercury alloy member can be held more stably.

  Means 8. The tube processing apparatus according to means 6 or 7, wherein the convex portion is tapered toward a radially outer side of the rotating roller.

  According to the means 8, the convex portions of the pair of rotating rollers taper toward the radially outer side of the rotating rollers. Therefore, the mount and the mercury alloy member are temporarily fixed at a pin point, and the space in the glass tube can be further secured. Thereby, the exhaust in the glass tube and gas introduction which are performed later can be performed still more efficiently.

  Means 9. A lamp manufacturing apparatus comprising the tube processing apparatus according to any one of means 1 to 8.

  As shown in the means 9, when the lamp manufacturing apparatus is provided with the above-described tube processing apparatus, a reduced diameter portion can be formed in a continuously moving glass tube with a relatively simple structure when manufacturing the lamp. The production efficiency can be improved without increasing the cost.

[First Embodiment]
The first embodiment will be described below with reference to the drawings.

  As shown in FIG. 1 (h), a cold cathode fluorescent lamp 1 constituting a lamp in this embodiment includes a bulb 2 made of glass, a first mount 3 provided in a sealed state at both ends of the bulb 2, 2 mounts 4. A phosphor layer 5 is provided on the inner wall surface of the bulb 2, and mercury vapor is present inside the bulb 2. Each of the mounts 3 and 4 includes an electrode portion 21, a lead wire 22 extending from the electrode portion 21, and a glass bead 23 provided on the base end side of the lead wire 22.

  The cold cathode fluorescent lamp 1 is manufactured as follows by using a predetermined manufacturing apparatus. That is, first, as shown in FIG. 1A, the phosphor layer 5 is formed at a predetermined portion of the inner wall surface of the glass tube 11. The phosphor layer 5 is formed by heating and baking a fluorescent coating applied to the inner wall surface of the glass tube 11. In the present embodiment, a portion of the glass tube 11 that substantially corresponds to the phosphor layer 5 is referred to as a bulb portion 12, and an upper portion in the drawing is referred to as a portion to be cut 13.

  Next, as shown in FIG. 1B, the first mount 3 is sealed at one end of the glass tube 11 with a burner or the like. When sealing the first mount 3, the glass tube 11 and the bead 23 of the first mount 3 are welded together.

  Next, the glass tube 11 shown in FIG. 1B is supplied to the tube processing apparatus 31 shown in FIG. In the tube processing apparatus 31, as shown in FIG. 1 (d), a first reduced diameter portion 15 and a second reduced diameter portion 16 are formed on the other end side of the glass tube 11 with a burner or the like, respectively. The second mount 4 is temporarily fixed to 15. Further, the mercury alloy member 18 is inserted into the second reduced diameter portion 16. As the mercury alloy member 18, for example, a metal cylinder in which a mercury alloy capable of releasing mercury vapor is preferably used. In addition, the mercury alloy member 18 is a relatively small cylinder or prism so as to be compatible with various glass tubes having various diameters. The first reduced diameter portion 15 is formed at a substantially boundary portion (near the area) between the valve portion 12 and the portion to be cut 13, and the second reduced diameter portion 16 is formed at a substantially intermediate position of the cut portion 13. Is done. The configuration and the like of the tube processing device 31 will be described in detail later.

  Subsequently, an inert gas (rare gas) such as argon is introduced while the glass tube 11 is evacuated. At this time, the glass tube 11 is heated in order to further improve the impurity discharge efficiency. Thereafter, the glass tube 11 is gradually cooled, and as shown in FIG. 1 (e), the end opposite to the side where the first mount 3 is sealed is sealed.

  Next, as shown in FIG. 1 (f), the mercury alloy member 18 in the glass tube 11 is heated from the outer periphery of the glass tube 11 using a bombarder 24 (high-frequency heating device), and mercury vapor is released into the glass tube 11. Let me. By this heat treatment, mercury vapor is released and flows into the valve portion 12.

  Next, as shown in FIG.1 (g), the said 2nd mount 4 latched by the 2nd diameter reduction part 16 of the glass tube 11 is sealed. More specifically, in a state where the glass tube 11 is positioned at a predetermined position, the bead 23 and the glass tube 11 are heated while rotating the burner 25 along the outer periphery of the second reduced diameter portion 16 of the glass tube 11. To weld. Thereafter, as shown in FIG. 1 (h), the portion to be cut 13 is cut away, leaving the sealing portion sealed by the bead seal method. In this way, the cold cathode fluorescent lamp 1 is obtained by going through a series of processes, in other words, through a manufacturing apparatus composed of various apparatuses for various processes.

  In this embodiment, since it has the characteristic in the pipe processing apparatus 31, the said pipe processing apparatus 31 is demonstrated next. As shown in FIG. 3, the tube processing device 31 includes a base 32 and a rotating shaft 34 that is erected so as to be rotatable relative to the base 32. A rotational driving force can be transmitted to the rotating shaft 34 from a driving source (not shown). The rotating shaft 34 is provided with a pair of disk-shaped tables 35 and 36 that rotate as the rotating shaft 34 rotates, and the outer periphery of the tables 35 and 36 holds the glass tube 11. First and second holding chucks 37 and 38 as means are provided. A plurality of the first and second holding chucks 37 and 38 are provided at predetermined intervals so as to hold the plurality of glass tubes 11. In the present embodiment, the driving source, the rotating shaft 34, the tables 35 and 36, and the like constitute a conveying means.

  As shown in FIGS. 2 and 3, in the tube processing device 31, the glass tube 11 conveyed from the carry-in conveyor 51 can be taken in at the take-in portion 31 a, and the take-out conveyer 52 is placed at the take-out portion 31 b. On the other hand, the glass tube 11 can be taken out. The taken-in glass tube 11 is hold | maintained at the 1st and 2nd holding chucks 37 and 38 so that the longitudinal direction of the glass tube 11 may maintain a vertical attitude | position. More specifically, the first chuck 37 holds one end of the glass tube 11 where the first mount 3 is sealed, and the second chuck 38 holds the other end of the glass tube 11. The held glass tube 11 is transported by the transport means while maintaining a vertical posture. Further, while the pair of tables 35, 36 substantially goes around, the glass tube 11 is taken out from the take-out portion 31 b through the mount temporary fixing zone 41, the mercury reduced diameter portion forming zone 42, and the mercury alloy throwing zone 43. It has become so. Further, when the glass tube 11 passes through each of the above zones, the conveying means is continuously moved without stopping, whereby the glass tube 11 is continuously moved in the counterclockwise direction of FIG. It is like that.

  As shown in FIGS. 3 to 5, the temporary mount fixing zone 41 is provided with a plurality of burners 39 </ b> A as a heating means and a pair of rotating rollers 40 </ b> A. The burner 39A and the pair of rotating rollers 40A are provided along the movement path of a predetermined portion on the other end side of the glass tube 11 (referred to as “first predetermined portion”). The burners 39 </ b> A are provided at predetermined intervals on the upstream side of the transport path of the glass tube 11, and are disposed so as to sandwich the transport path of the glass tube 11. The pair of rotating rollers 40 </ b> A is provided on the downstream side of the burner 39 </ b> A in the conveyance path of the glass tube 11, and the interval between the rotating rollers 40 </ b> A is set narrower than the width (diameter) of the glass tube 11. And when the glass tube 11 passes, it arrange | positions so that the glass tube 11 may be pinched | interposed by the outer peripheral surface. Further, the rotating roller 40A has a disk shape in which the outer peripheral portion is relatively thinner than the inner peripheral portion. In addition, the rotating roller 40A is supported so as to be freely rotatable with respect to a fixing member (not shown). In the present embodiment, one rotating roller 40A can be moved and adjusted in the contact / separation direction with respect to the other rotating roller 40A, so that the interval between the rotating rollers 40A can be adjusted in advance. Yes. A fixing member (not shown) extending from the table 36 is provided with a mount holding device 48 for holding the second mount 4 corresponding to the first predetermined portion and maintaining the state. The mount holding device 48 is provided with a nozzle 49 so as to be able to appear and retract, and the second mount 4 can be held via the nozzle 49.

  Further, the reduced diameter portion forming zone 42 for mercury has a configuration similar to the temporary mounting zone 41, and is provided with a plurality of burners 39B and a pair of rotating rollers 40B. However, as shown in FIGS. 6 and 7, the burner 39 </ b> B and the pair of rotating rollers 40 </ b> B have a predetermined portion (“second predetermined portion”) on the other end side (upper side in the drawing) of the glass tube 11 than the first predetermined portion. It is provided along the movement route. Further, the interval between the pair of rotating rollers 40B can also be adjusted. In the present embodiment, the distance between the pair of rotating rollers 40B is also adjusted in advance, and the inner diameter of the second reduced diameter portion 16 of the glass tube 11 is made narrower than the diameter of the mercury alloy member 18, so It is adjusted to be narrower than the interval between the rotating rollers 40A.

  Further, the mercury alloy charging zone 43 is provided with a mercury alloy charging device (not shown) for charging the mercury alloy member 18 into the second reduced diameter portion 16 of the glass tube 11.

  According to the tube processing device 31 configured as described above, the first and second reduced diameter portions 15 and 16 can be formed in the glass tube 11 during the continuous movement process while realizing the continuous movement of the glass tube 11. It has become. Then, next, the procedure of forming the first and second reduced diameter portions 15 and 16 in the tube processing apparatus 31 will be described.

  First, as shown in FIG. 2, the glass tube 11 is taken in from the take-in portion 31 a of the tube processing device 31 and is held by the first and second holding chucks 37 and 38. The introduced glass tube 11 is guided to the temporary mounting zone 41. In the mount temporary fixing zone 41, as shown in FIG. 3, the 1st predetermined site | part of the glass tube 11 conveyed is heated by the burner 39A, and is made into a softened state. Note that, during or before the heating, the second mount 4 is held in a state corresponding to the first predetermined portion. More specifically, the lead wire 22 of the second mount 4 is held by the nozzle 49, and the second mount 4 is inserted from the other end side opening of the glass tube 11 in this state. Then, the nozzle 49 protrudes toward the first predetermined portion, and when the second mount 4 reaches the first predetermined portion, the nozzle 49 is stopped. Thus, the second mount 4 is held in a state corresponding to the first predetermined portion. Next, the glass tube 11 in which the second mount 4 is positioned corresponding to the first predetermined portion passes between the pair of rotating rollers 40A as shown in FIG. At the time of the passage, the first reduced diameter portion 15 is formed in the first predetermined portion heated by the burner 39A to be in a softened state, whereby the second mount 4 is temporarily fixed to the first predetermined portion. After the second mount 4 is temporarily fixed, the holding by the nozzle 49 is released, and the nozzle 49 is led out into the mount holding device 48, that is, out of the glass tube 11.

  Subsequently, the glass tube 11 is continuously conveyed to the reduced diameter portion forming zone 42 for mercury. In the mercury reduced diameter portion forming zone 42, as shown in FIG. 6, the second predetermined portion of the glass tube 11 being conveyed is heated by a burner 39B. The glass tube 11 passes between the pair of rotating rollers 40B, and the second reduced diameter portion 16 is formed at the second predetermined portion heated by the burner 39B and softened. The second reduced diameter portion 16 has a shape that is inserted inward in the radial direction of the glass tube 11 as compared with the first reduced diameter portion 15 in order to support a mercury alloy member 18 to be introduced later.

  Next, in the mercury alloy charging zone 43, the mercury alloy member 18 is charged by the mercury alloy charging device from the opening on the other end side of the glass tube 11, and the charged mercury alloy member 18 is placed on the second reduced diameter portion 16. Supported.

  As described above in detail, in this embodiment, the glass tube 11 passes between the pair of rotating rollers 40A and 40B, so that the first and second glass tubes 11 heated by the burners 39A and 39B and softened. 2 The first and second reduced diameter portions 15 and 16 can be formed at predetermined portions, respectively. Further, it is not necessary to provide a pressing means for sandwiching and pressing the glass tube 11 by moving itself, so that the first and second are automatically performed in the process of transporting the glass tube 11 without stopping the glass tube 11. The reduced diameter portions 15 and 16 can be formed. For this reason, the first and second reduced diameter portions are transported with a relatively simple configuration without providing a conventional pressing means or a moving mechanism for moving the pressing means in accordance with the movement of the glass tube 11. 15, 16 can be formed. As a result, it is possible to improve production efficiency by speeding up the production line, simplify production equipment, and suppress cost increase.

  Further, when the glass tube 11 is pressed by the pressing means, there is a concern that the amount of the reduced diameter portion entering the radially inner side of the glass tube 11 excessively increases or decreases due to the stroke amount of the pressing means. However, according to the present embodiment, if the pair of rotating rollers 40A and 40B are installed, the first and second contractions with a fixed amount of intrusion only by moving the glass tube 11 along a predetermined path. The diameter parts 15 and 16 can be formed stably.

  Moreover, in this embodiment, the structure which supports a pair of rotation roller 40A, 40B so that free rotation is possible is employ | adopted, and it is not necessary to provide a special drive source in order to rotate rotation roller 40A, 40B. Thereby, the further simplification of a manufacturing facility and the further suppression of the increase in cost can be aimed at.

Furthermore, one rotating roller 40A can move in the contact / separation direction with respect to the other rotating roller 40A, and thereby the interval between the rotating rollers 40A can be adjusted. Accordingly, the reduced diameter portion can be formed corresponding to various glass tubes having different widths. Further, as described above, with respect to the second reduced diameter portion 16 formed to support the relatively small diameter mercury alloy member 18, the amount of the glass tube 11 entering in the radial direction can be made relatively large. it can. That is, it is possible to appropriately adjust the amount of the reduced diameter portion entering the radially inner side of the glass tube in consideration of the use of the reduced diameter portion.
[Second Embodiment]
In the second embodiment, the shapes and operations of the rotating rollers 40A and 40B in the first embodiment are mainly different. That is, it is assumed that the rotating roller 40C shown in FIG. 8 is replaced with the rotating rollers 40A and 40B in the first embodiment. Therefore, in the following, the description will be made focusing on the rotating roller 40C.

  In the present embodiment, the pair of rotating rollers 40 </ b> C has a plurality of convex portions 45 projecting in the outer peripheral direction at predetermined intervals on the outer peripheral surface thereof. In addition, the convex portion 45 is tapered toward the radially outer side of the rotating roller 40C. Moreover, when the convex part 45 which the one rotating roller 40C has, and the other rotating roller 40C oppose on both sides of the glass tube 11, the space | interval of the said convex part 45 is narrower than the width | variety (diameter) of the glass tube 11. It is supposed to be. Further, when the glass tube 11 passes between the pair of rotating rollers 40C, both rotations are performed so that the convex portion 45 of one rotating roller 40C and the convex portion 45 of the other rotating roller 40C face each other with the glass tube 11 interposed therebetween. Synchronous rotation means 46 for synchronously rotating the roller 40C is provided. Here, the synchronous rotation means 46 rotates the rotating roller 40C in the same direction as the direction in which the glass tube 11 passes (the direction of the black arrow in the figure) (the direction of the white arrow in the figure), and the glass tube The rotating roller 40C is controlled so that the moving speed of 11 and the moving speed of the tip of the convex portion 45 are the same. As the synchronous rotation means 46, for example, synchronous rotation may be obtained from the drive source that rotates the rotary shaft 34, or a separate synchronous motor may be provided.

  As described above, in the second embodiment, the first and second reduced diameter portions 15 and 16 are locally formed in the glass tube 11 by being sandwiched between the convex portions 45 from both sides. Accordingly, the second mount 4 and the mercury alloy member 18 can be temporarily fixed, and the second mount 4 and the mercury alloy member 18 can be prevented from falling off, while the first and second reduced diameter portions 15 and 16 are so-called pins. Since it is formed with points, the gaps in the first and second reduced diameter portions 15 and 16 in the glass tube 11 can be secured as wide as possible. Therefore, exhaust and gas introduction in the glass tube 11 can be performed efficiently. Moreover, since the convex part 45 is tapered, it is easier to secure a gap in the first and second reduced diameter parts 15 and 16 in the glass tube 11.

  In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows. Of course, other application examples and modification examples not illustrated below are also possible.

  (A) In the above embodiment, the first mount 3 is sealed in advance and the second mount 4 is temporarily fixed. However, the first mount 3 is also temporarily fixed in the same manner as the second mount 4. It is good. In this case, for example, as shown in FIGS. 9 and 10, a burner 39 </ b> D and a pair of rotating rollers 40 </ b> D are provided along the movement path of the one end side predetermined portion for temporarily fixing the first mount 3 in the glass tube 11. The burner 39E and the pair of rotating rollers 40E may be provided along the movement path of a predetermined part on the other end side where the two mounts 4 are temporarily fixed. Thereby, a plurality of reduced diameter portions can be formed almost simultaneously, and further improvement in production efficiency can be achieved.

  (B) In the second embodiment, the first and second reduced diameter portions 15 and 16 are formed in the glass tube 11 by the glass tube 11 being sandwiched between the convex portions 45 of the rotating rollers 40C. It is like that. On the other hand, as shown in FIG. 11, when the glass tube 11 passes, the first convex portion 45A of one rotating roller 40C and the second convex portion 45B of the other rotating roller 40C are formed. , Sandwiching a portion of the glass tube 11 located on the upstream side in the transport direction, and formed on one rotating roller 40C, adjacent to the first convex portion 45A, and on the downstream side in the transport direction of the glass tube 11 A third convex portion 45C that is positioned and a fourth convex portion 45D that is formed on the other rotating roller 40C, is adjacent to the second convex portion 45B, and is located downstream in the transport direction of the glass tube 11. The reduced diameter portion may be formed by sandwiching a portion of the glass tube 11 located downstream in the transport direction. As a result, the gaps in the first and second reduced diameter portions 15 and 16 in the glass tube 11 can be secured as wide as possible, and the first and second reduced diameter portions 15 and 16 formed of four concave portions are formed. can do. Therefore, the second mount 4 and the mercury alloy member 18 can be held more reliably.

  (C) In the first embodiment, the pair of rotating rollers 40A and 40B are disc-shaped, but either one of the pair of rotating rollers 40A and 40B is described in detail in the second embodiment. It is good also as replacing with the rotating roller 40C which has the convex part 45 made.

  (D) In the above-described embodiment, the first and second holding chucks 37 and 38 are provided on the tables 35 and 36. First and second holding chucks 37 and 38 may be provided.

  (E) In the above embodiment, the glass tube 11 is held so that the longitudinal direction of the glass tube 11 maintains a vertical posture, but the longitudinal posture of the glass tube 11 is not limited to be vertical. . For example, it is good also as holding | maintaining the glass tube 11 so that the longitudinal direction of the glass tube 11 may become a horizontal direction.

  (F) In the above-described embodiment, one rotating roller 40 is configured to be movable in a direction in which the rotating roller 40 is in contact with or separated from the other rotating roller 40 so that the interval between the two rotating rollers 40 can be adjusted. The rotating roller 40 may also be configured to be movable in a direction in which the rotating roller 40 is in contact with or separated from the one rotating roller 40.

  (G) In the said 2nd Embodiment, although the convex part 45 has comprised the taper shape, the shape of the convex part 45 is not limited to the said shape. For example, the convex portion 45 may have a substantially rectangular parallelepiped shape.

(A)-(h) is sectional drawing and apparatus drawings, such as a glass tube, which show typically the manufacturing process of the cold cathode fluorescent lamp in one Embodiment. It is a plane schematic diagram which shows a pipe | tube processing apparatus. It is a schematic block diagram which shows the burner etc. which are some pipe processing apparatuses in a mount temporary fix | stop zone. It is a schematic block diagram which shows the rotating roller etc. which are some pipe processing apparatuses in a mount temporary fix | stop zone. It is an expansion schematic diagram which shows the shape of a rotating roller. It is a schematic block diagram which shows the burner etc. which are some pipe processing apparatuses in the reduced diameter part formation zone for mercury. It is a schematic block diagram which shows the rotating roller etc. which are a part of pipe processing apparatus in the reduced diameter part formation zone for mercury. It is an expansion schematic diagram which shows the shape etc. of the rotating roller in 2nd Embodiment. It is a schematic block diagram which shows positional relationships, such as a burner which is a part of pipe processing apparatus in other embodiment. It is a schematic block diagram which shows the positional relationship of the rotation roller etc. which are some tube processing apparatuses in other embodiment. It is an expansion schematic diagram which shows the positional relationship of the convex part of a rotating roller and glass tube in other embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cold cathode fluorescent lamp, 15 ... 1st reduced diameter part, 16 ... 2nd reduced diameter part, 31 ... Pipe processing apparatus, 37 ... 1st holding chuck as a holding means, 38 ... 2nd as a holding means Holding chuck, 39, 39A, 39B, 39C, 39D, 39E ... burner as heating means, 40A, 40B, 40C, 40D, 40E ... rotating roller, 45 ... convex portion, 45A ... first convex portion, 45B ... first 2 convex parts, 45C ... 3rd convex part, 45D ... 4th convex part, 46 ... synchronous rotation means.

Claims (9)

A tube processing apparatus for reducing the diameter of a glass tube for forming a lamp,
Holding means for holding the glass tube;
A transporting means for transporting the glass tube held by the holding means by moving the holding means;
A heating means arranged along a path along which the glass tube is conveyed, and heating a predetermined portion of the glass tube;
A pair of rotating rollers arranged to sandwich the predetermined portion of the glass tube,
The distance between the pair of rotating rollers is narrower than the width of the glass tube,
Forming the reduced diameter portion at the predetermined portion of the glass tube that has been softened through the heating means by passing between the pair of rotating rollers by the glass tube conveyed by the conveying means; A tube processing device. A tube processing apparatus for reducing the diameter of a glass tube for forming a lamp,
Holding means for holding the glass tube;
Conveying means for conveying the glass tube held by the holding means so as to continuously move by moving the holding means;
A heating means for heating a predetermined portion of the glass tube which is arranged along a path along which the glass tube is conveyed and is continuously moved;
A pair of rotating rollers arranged to sandwich the predetermined portion of the glass tube,
The distance between the pair of rotating rollers is narrower than the width of the glass tube,
Forming the reduced diameter portion at the predetermined portion of the glass tube that has been softened through the heating means by passing between the pair of rotating rollers by the glass tube conveyed by the conveying means; A tube processing device.   The pipe machining apparatus according to claim 1 or 2, wherein the pair of rotating rollers are supported so as to be freely rotatable.   The said predetermined part has multiple places along the longitudinal direction of the said glass tube, The said pair of rotation roller is provided corresponding to each predetermined part, The Claim 1 thru | or 3 characterized by the above-mentioned. Tube processing equipment.   2. The distance between the pair of rotating rollers can be adjusted by enabling at least one of the pair of rotating rollers to move in a direction in which the pair of rotating rollers approach or separate. The pipe processing apparatus in any one of thru | or 4. The pair of rotating rollers has a plurality of protrusions protruding at predetermined intervals in the outer circumferential direction,
When the glass tube passes between the pair of rotating rollers, the convex portion of one rotating roller of the pair of rotating rollers and the convex portion of the other rotating roller sandwich the glass tube. 6. The tube processing apparatus according to claim 1, further comprising a synchronous rotating unit that rotates the pair of rotating rollers in a synchronized manner so as to face each other. The pair of rotating rollers has a plurality of protrusions protruding at predetermined intervals in the outer circumferential direction,
When the glass tube passes between the rotating rollers,
A first convex portion formed on one rotating roller of the pair of rotating rollers and a second convex portion formed on the other rotating roller are upstream of the conveying direction of the glass tube. Facing each other across the location,
And formed on the one rotating roller, formed on the third rotating portion adjacent to the first protruding portion and positioned on the downstream side in the conveying direction of the glass tube, and on the other rotating roller, Adjacent to the second convex portion and the fourth convex portion located downstream in the transport direction of the glass tube are opposed to each other across a portion of the glass tube located downstream in the transport direction. Comprising synchronous rotating means for synchronizing and rotating the pair of rotating rollers,
6. The tube processing apparatus according to claim 1, wherein the reduced diameter portion is formed at the predetermined portion by the first to fourth convex portions.   The tube processing apparatus according to claim 6 or 7, wherein the convex portion is tapered toward a radially outer side of the rotating roller.   The lamp manufacturing apparatus provided with the pipe | tube processing apparatus in any one of Claims 1 thru | or 8.

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