JP4829207B2 - Glass tube cutting equipment - Google Patents

Description

  The present invention particularly relates to a glass tube cutting apparatus suitable for cutting small-sized glass tubes that are continuously drawn by the Danner method or the like and conveyed at a relatively high speed.

  In recent years, thin fluorescent tubes have been developed for power saving and are widely used for bulb-type fluorescent lamps that have come to be distributed. From such a background, in order to meet the demand for small-diameter glass tubes that are thinner than the glass tubes used in conventional fluorescent tubes, for example, having a tube diameter of about 1.2 mm to 10.0 mm, The need for equipment to manufacture is increasing. And in order to make a glass tube into a thin tube, it is generally necessary to increase the drawing speed of the glass tube as compared with conventional glass tube manufacturing.

  Such glass tubes are continuously formed by the Danner method or the like. First, the strip-shaped molten glass supplied on the downwardly inclined sleeve rotating from the forehouse of the glass melting furnace is drawn out from the lower end of the inclined sleeve and formed into a tubular shape. After the tube is drawn, it is cut by a cutting device into a predetermined length.

  Conventionally, there is a chill-cut method for cutting glass tubes. A high-temperature glass tube rod that is continuously formed is contacted with a cutter cooled by a sponge of a water supply device, and at the same time, the glass tube is cut by heat shock. The rod is cut (see, for example, Patent Document 1).

  However, in the above-described prior art, particularly when trying to cut a glass tube rod having a small tube diameter, the interval at which the cutting cutter contacts the glass tube rod by increasing the drawing speed of the glass tube rod. Becomes shorter and the cutter cannot be cooled sufficiently. Also, since the glass tube rod has a small tube diameter, the heat capacity of the glass tube rod itself is small and the temperature of the glass tube rod is likely to drop, and the temperature difference between the glass tube rod and the cutter cannot be obtained sufficiently, resulting in damage. However, since the crack extension due to heat shock cannot be sufficiently obtained, the glass tube rod cannot be reliably cut. Further, if the cutter is made to penetrate deeper in the tube diameter direction for reliable cutting, the cut end of the glass tube rod is broken, and cracks, protrusions, and cracks are formed. With such a cut, it may not be possible to obtain the desired overall length by cutting off cracks or the like, or broken glass pieces may adhere to the transport device and cause minute scratches on the surface of the glass tube rod. There is.

  In addition, a guide roller is arranged on the back side of the portion where the cutter and the glass tube rod contact, and the glass tube rod slides on the guide roller so that the glass tube rod always contacts the guide roller. It has become. Since it is such a structure, the glass piece which generate | occur | produces when the damage | wound for cut | disconnecting to a glass tube rod with a cutter will adhere to the guide roller surface.

Then, the glass piece adhering to the surface of the guide roller is reattached to the surface of the glass tube rod sliding on the guide roller, and further conveyed to the subsequent process. There is a risk of scratching. Furthermore, since the guide roller temporarily becomes defective in rotation due to an impact when the cutter contacts the glass tube rod, there is a risk that the glass tube rod surface may be damaged by the glass piece remaining on the guide roller surface. Yes, especially when it becomes a glass tube rod with a small tube diameter, it will bend more easily when the cutter comes into contact with it, the guide roller will likely rotate poorly, and the glass tube rod surface will be damaged. There is a risk of becoming easy.
Japanese Utility Model Publication No. 4-109900

  The present invention has been made in view of the above situation, and the object of the present invention is to stably and surely cut flaws at a certain depth with respect to a continuously conveyed glass tube, in particular, a small tube diameter. Therefore, an object of the present invention is to provide a glass tube cutting device that can be attached to the surface of the glass tube and that can reduce damage to the surface of the glass tube caused by a glass piece that is generated when a cut is made.

The glass tube cutting device of the present invention comprises:
A glass tube that cuts a glass tube, which is conveyed at a constant speed by a conveying means, into a predetermined length by making a cutting flaw at a predetermined position on the outer wall surface of the glass tube by a cutting flaw forming means provided along the conveying means. The cutting flaw forming means includes a scratching mechanism for intermittently contacting the glass tube with a scratching tool and attaching the cut scar to the glass tube at a predetermined length interval, and the glass tube. At least one pair is provided on the upstream side and downstream side in the conveyance direction of the position to be damaged, and the receiving roller and the pressing roller that hold the glass tube that is running at the time of scratching, and bends due to contact of the scratching tool at the time of scratching The glass tube is supported while being run, and includes a support member disposed between the receiving rollers so as to be in non-contact with the glass tube except when being damaged. A.

Further, the support member is a flat plate or a roller,
Further, the flat plate-like support member is characterized by having an inclined surface that is inclined downward toward the outer peripheral portion of the upper surface,
Further, the support member is characterized in that the surface of the part that is in contact with the glass tube is formed of a material that has high hardness and wear resistance and does not have magnetism,
Further, the glass tube is characterized in that it is continuously drawn into a straight tube in a forming step and conveyed in a state rotated in a certain direction,
Further, the scratching tool of the scratching mechanism is formed to move in the transport direction at the same speed as the traveling speed of the glass tube when scratching.

  According to the present invention, it is possible to stably and surely attach a cut flaw of a certain depth even to a glass tube having a small tube diameter that is continuously conveyed, and a glass piece generated when the cut flaw is made. As a result, the glass tube surface can be hardly damaged. Thereby, a glass tube can be cut | disconnected reliably in the cutting means of a post process.

  Embodiments of the present invention will be described below with reference to the drawings.

  A first embodiment will be described with reference to FIGS. FIG. 1 is a front view showing a glass tube cutting device, FIG. 2 is a view showing a glass tube forming process by the Danner method, FIG. 3 is a view showing a supporting member, and FIG. 3 (a) is a plan view. 3 (b) is a side view, FIG. 4 is a view showing a modified form of the support member, FIG. 4 (a) is a plan view, and FIG. 4 (b) is a side view.

  First, a process of forming a glass tube having a small tube diameter by the Danner method, for example, a tube outer diameter of about 1.2 mm to 10.0 mm will be described with reference to FIG. The glass tube 1 supplies the molten glass 3 drawn out from the forehouse 2 of the glass melting furnace so as to be wound around a rotating downwardly inclined sleeve 4, and is drawn out into a tubular shape from the inclined lower end of the sleeve 4. Then, the tube is gradually cooled and further drawn by a pipe drawing device 5 in the direction of arrow A at a constant speed corresponding to the pipe diameter. Reference numeral 6 denotes a defect detector that performs online defect detection. In this way, the pipes are continuously drawn and, for example, a horizontal direction while rotating around the pipe axis by the conveying means 8 constituted by arranging a large number of conveying rollers 7 in a direction orthogonal to the conveying direction so as to take the rotation axis direction. The straight glass tube 1 conveyed linearly is cut to a predetermined length, for example, 1.0 m to 2.3 m by the cutting device 9, and then the non-defective product 11 is collected by the reject device 10.

  Next, referring to FIG. 1, a cutting device 9 for cutting a straight glass tube 1 drawn into a predetermined length and being transported while being continuously rotated at a constant speed in the horizontal direction will be described. In FIG. 1, a cutting device 9 is provided along the conveying direction A of the glass tube 1 by the conveying means 8, and a cut flaw forming means 13 that applies cut flaws 12 to the outer wall surface of the glass tube 1 at intervals equal to the cutting length. And a cutting means 14 provided at a downstream position in the conveying direction A from the cut flaw forming means 13 and extending the cut flaw 12 over the entire circumference of the glass tube 1 in the circumferential direction and cutting it to a predetermined length. Has been.

  Then, the cut flaw forming means 13 located on the upstream side in the conveying direction A of the glass tube 1 includes a flaw mechanism 15 for intermittently attaching the cut flaw 12 to the glass tube 1 and a cut flaw on the glass tube 1 by the flaw mechanism 15. The receiving roller 16a is provided with a pair each on the upstream side and the downstream side in the transport direction A at the position where 12 is attached, and also acts as a transport roller for holding the glass tube 1 so as to be sandwiched from above and below while traveling in the horizontal direction, for example. , 16b, presser rollers 17a, 17b, and two receiving rollers 16a, 16b positioned on the lower side of the glass tube 1, and when the cut flaw 12 is made, the glass tube 1 traveling at the scratching position is slid. However, a flat support member 18 that supports the support surface 18a is provided.

  Further, the scratching mechanism 15 is a rotating circle that rotates as indicated by an arrow B at a predetermined speed around the rotation shaft 19 in a plane parallel to the conveyance direction A of the glass tube 1 above the position where the cut scratch 12 is applied. The plate 20 is attached to the rotating disk 20 and driven by the rotation driving device 21 while revolving, thereby rotating in a plane orthogonal to the rotating disk 20 and intermittently contacting the outer wall surface of the glass tube 1. In addition, it is formed with a scratching tool 22 for a rotary blade such as a disc grindstone that attaches a cut scratch 12 in a direction substantially perpendicular to the tube axis to the glass tube 1 from above. In addition, when the attached scratching tool 22 makes the cut wound 12 on the glass tube 1, the rotating disk 20 moves so that the scratching tool 22 moves in the traveling direction of the glass tube 1 at the same speed as the speed of the glass tube 1. Furthermore, it rotates at a constant speed or at a non-uniform speed.

  Further, as shown in FIG. 3, the support member 18 that supports the glass tube 1 when the cut flaw 12 is attached is a rectangular flat plate having a longitudinal direction in the conveying direction A, and a pedestal 18 b on the rectangular flat plate base 18 b. The end portion in the transport direction A is a slender surface 18c having a downward slope from the support surface 18a, which is the upper surface portion, and is provided so as to project the support plate 18d having a trapezoidal cross section in the transport direction A. Yes. The support plate 18d has at least a support surface 18a formed of a material having high hardness and wear resistance and not having magnetism, so that contact between the glass tube 1 and iron can be avoided.

  That is, the support member 18 is, for example, a so-called hardened material such as die steel or die steel, which is surface hardened, tungsten carbide alloy, austenitic wear-resistant sprayed stainless steel (Tungaroy: registered trademark), or the like, and the support surface 18a. Is formed. Furthermore, when the supporting member 18 attaches the cut wound 12 to the glass tube 1 with the scratching tool 22 by an attachment mechanism (not shown), the glass tube 1 that is bent by the contact of the scratching tool 22 is smoothly smoothed in an appropriate bending state. The glass tube 1 is supported so that it slides and is not in contact with the glass tube 1 except when it is damaged. For example, a gap of approximately 0.5 mm is formed between the support surface 18a of the support member 18 and the glass tube 1. Is provided.

  On the other hand, the cutting means 14 is at a cutting position at a position downstream of the conveying direction A according to the position of the cutting flaw 12 attached to the outer wall surface of the glass tube 1 conveyed while rotating from the cutting flaw forming means 13. Be placed. That is, for example, when the cut flaw 12 attached to the outer wall surface of the glass tube 1 is on the lower side when it is transported by the cutting length, the cutting means 14 uses the lower position as the cutting position. Be placed. Moreover, the cutting means 14 presses the pipe outer wall surface (the back surface on the side where the cut flaw 12 is formed) which is the opposite side of the cut flaw 12 of the glass tube 1 at the cutting position, so that the cut flaw 12 is removed from the entire circumferential tube. A pressing roller 23 that is cut so as to extend around the circumference, and the glass tube 1 that is provided on the upstream side and the downstream side in the conveying direction A of the pressing roller 23 and that runs in the horizontal direction serves as a fulcrum for cutting. Further, for example, fulcrum rollers 24a and 24b are provided which also act as conveying rollers supported from the lower side so as to resist the pressing force.

  In addition, since the separation distance between the cutting means 14 and the cut flaw forming means 13 varies depending on the tube diameter, tube drawing speed, and rotation speed of the glass tube 1, the arrangement position (cutting position) can be changed correspondingly. ing. This also changes the circumferential position of the cut flaw 12, and the pressing direction of the pressing roller 23 can be changed accordingly.

  Moreover, about the press roller 23, a position can be adjusted according to a cutting condition, respectively, and can be fixed to the direction shown by the arrow C and the arrow D in the running direction of the glass tube 1, the direction which presses the glass tube 1, and each opposite direction. For example, 50% to 50% of the tube outer diameter of the glass tube 1 from the position in contact with the outer wall surface of the glass tube 1 traveling in the horizontal direction toward the tube axis direction (direction in which the glass tube is pushed and bent) It is fixed at a position biased in the pressing direction by about 130% (for example, about 2 mm to 5 mm when the tube outer diameter is 4 mm). Thus, the traveling glass tube 1 is pressed by the pressing roller 23 provided at a biased position while being supported by the fulcrum rollers 24a and 24b from the lower side, and bending stress acts on the glass tube 1 to the lower side. It comes to bend. In addition, when the fixing position of the pressing roller 23 is a position deviated by less than 50% of the outer diameter of the tube in the pressing direction of the glass tube, there is a possibility that sufficient pressing force does not act on the glass tube 1 and reliable cutting cannot be performed. There is. Further, when the fixing position of the pressing roller 23 is a position deviating more than 130% of the outer diameter of the tube in the pressing direction of the glass tube 1, the glass tube 1 is cut before the pressing roller 23, or the conveyance is smooth. The problem that it cannot be done occurs. The pressing roller 23 and the fulcrum rollers 24a and 24b are made of a material that does not damage the glass tube 1 and has high wear resistance. For example, a roller made of polytetrafluoroethylene or PEEK can be preferably used.

  In the cutting device 9 configured as described above, the glass tube 1 that is continuously conveyed linearly while being rotated in the horizontal direction by the conveying means 8 is first cut on the outer wall of the tube by the cut flaw forming means 13. A cut wound 12 in a direction perpendicular to the tube axis on the side surface is a scratching tool 22 that moves in the running direction in synchronization with the glass tube 1 of the scratching mechanism 15, and is vertically moved by the receiving rollers 16 a and 16 b and the pressing rollers 17 a and 17 b. It is hold | maintained so that it may pinch | interpose, and it is attached, running so that the upper surface of the supporting member 18 may slide. Further, in the cut flaw forming means 13, when the glass tube 1 is conveyed by a predetermined cut length from the cut flaw 12 previously attached and sent out, the flaw tool 22 of the flaw mechanism 15 that operates intermittently is damaged again. By the operation, the next cut flaw 12 is applied in the same manner.

  In the cut flaw forming means 13, since the glass tube 1 has a small tube diameter and the temperature is not high, the temperature difference between the glass tube 1 and the scratching tool 22 is small, and the glass tube 1 is not cut only by scratching. . Further, when the cut flaw 12 is made, the glass tube 1 is held so as to be sandwiched between the receiving rollers 16a and 16b and the press rollers 17a and 17b provided on the upstream side and the downstream side of the flaw mechanism 15 from above and below. Since the lower side is supported by 18, even a glass tube having a small tube diameter that is easily bent by the contact of the wound tool 22 can minimize the amount of bending and stably form a scratch having a certain depth. .

  Note that the cut flaw 12 formed on the glass tube by the cut flaw forming means 13 needs to have a constant depth. When the cut flaw 12 is formed deeper than desired, the cut flaw 12 is cracked and a good cut cannot be obtained. Further, when the cut flaw 12 is formed shallower than desired, there is a possibility that the cutting means 14 in the subsequent process cannot be cut reliably.

  Subsequently, the cut flaw 12 is attached by the cut flaw forming means 13, and the glass tube 1 conveyed to the cutting means 14 while rotating around the tube axis is pressed by the pressing means 23 and the two fulcrum rollers 24a. 24b, while being deformed so that it is pressed from the upper side and bent downward, the glass tube 1 is rotated halfway so that the cut flaw 12 is positioned substantially below the pressure roller 23, and the pressure roller 23 is cut flaw 12 When the tube outer wall surface on the opposite side is pressed, the cut flaw 12 extends to the entire circumference of the tube, and the glass tube 1 is cut. Note that, when the glass tube is cut, the pressing roller 23 supports the force by which the outer wall surface of the glass tube 1 is pressed by the two fulcrum rollers 24a and 24b. Cutting is done and the cut is in good condition. Further, since the bending stress of the glass tube 1 due to the pressing force acts locally on the entire length of the glass tube 1, the glass tube 1 is transported in a stable state in the subsequent process without affecting the transport state of the glass tube 1. Is possible.

  As described above, by forming as in the present embodiment, the glass tube 1 is thinned to reduce the tube diameter, the heat capacity of the glass tube 1 itself is reduced, and the tube drawing speed is increased to increase the glass tube. Even if a temperature difference between 1 and a grindstone or a knife cannot be obtained sufficiently, the straight glass tube 1 can be continuously and stably cut to a predetermined length, and further, The reject device 10 can perform the transport of the glass tube 1 before the cutting and the glass tube 1 after the cutting by the transport means 8 without any trouble, and sorts the glass tube 1 obtained by cutting the good and bad in the subsequent process. In a stable state, the sorting process for collecting the non-defective product 11 can be performed normally.

  Moreover, since the lower outer wall surface of the glass tube 1 is in contact with the support surface 18a of the support member 18 only when the cut scar is attached to the upper outer wall surface by the cut scar forming means 13 in the glass tube 1, the glass piece generated at the time of scratching is obtained. Is less likely to adhere to the glass tube 1 and the end portion of the support plate 18d of the support member 18 in the transport direction A is an inclined surface 18c. Therefore, the glass piece is easily excluded from the support member 18, and the glass piece There is very little possibility that will adhere and cause unnecessary scratches on the surface of the glass tube 1. Further, since the glass tube 1 and the support member 18 are in a non-contact state except when being damaged, there is a risk that the glass tube 1 may be damaged by a glass piece or the like in a portion other than the vicinity of the portion where the cut damage is applied to the glass tube 1. There is no.

  In the above embodiment, the shape of the support member 18 has the inclined surface 18c only at the end in the transport direction A of the support plate 18d. However, as in the modification shown in FIG. It is assumed that a flat quadrangular pyramid-shaped support plate 18'd is provided on the pedestal 18b, and glass pieces are excluded by inclined surfaces 18'c provided on four sides of the support surface 18a. Good. By forming in this way, the same effects as in the above embodiment can be obtained.

  2nd Embodiment is described with the front view which shows the cutting device of the glass tube of FIG. The present embodiment is different from the first embodiment in the support member portion of the cut flaw forming means. The same reference numerals are given to the same portions as those in the first embodiment, and the description is omitted. A configuration of the present embodiment that is different from the embodiment will be described.

  In FIG. 5, the cutting device 31 for the glass tube 1 is a small tube diameter glass having a tube outer diameter of about 1.2 mm to 10.0 mm, for example, according to the Danner method shown in FIG. 2 as in the first embodiment. The glass tube 1 is used for the cutting process of the glass tube 1 in the tube forming process, and is continuously drawn at a constant speed corresponding to the tube diameter in the direction of arrow A while rotating by the tube drawing device 5. Is cut into a predetermined length by the cutting device 31. Such a cutting device 31 is provided along the conveying direction A of the glass tube 1 by the conveying means 8, and a cut flaw forming means 32 for attaching cut flaws 12 to the outer wall surface of the glass tube 1 at intervals equal to the cutting length, A cutting means 14 is provided at a position downstream of the cut flaw forming means 32 in the conveying direction A, and includes a cutting means 14 that extends the cut flaw 12 over the entire circumference of the glass tube 1 and cuts it to a predetermined length. .

  Then, the cut flaw forming means 32 located on the upstream side in the conveying direction A of the glass tube 1 includes a flaw mechanism 15 for intermittently attaching the cut flaw 12 to the glass tube 1, and a cut flaw on the glass tube 1 by the flaw mechanism 15. The receiving roller 16a is provided with a pair each on the upstream side and the downstream side in the transport direction A at the position where 12 is attached, and also acts as a transport roller for holding the glass tube 1 so as to be sandwiched from above and below while traveling in the horizontal direction, for example. , 16b, presser rollers 17a, 17b, and two receiving rollers 16a, 16b positioned on the lower side of the glass tube 1, and when the cut flaw 12 is made, the glass tube 1 traveling at the scratching position is slid. However, a support member 33 provided with at least one support roller 33a to support is provided.

  Further, the scratching mechanism 15 is, for example, a rotating disk 20 that rotates in a direction indicated by an arrow B at a predetermined speed above a position where the cut wound 12 is applied, and a rotating disk 20 that is attached to the rotating disk 20 and revolves and is orthogonal to the rotating disk 20. A rotating blade such as a disc grindstone that rotates on the surface to rotate, intermittently contacts the outer wall surface of the glass tube 1, and attaches a cut wound 12 in a direction substantially perpendicular to the tube axis to the glass tube 1 from above. The tool 22 is formed. In addition, when the attached scratching tool 22 makes the cut wound 12 on the glass tube 1, the rotating disk 20 moves so that the scratching tool 22 moves in the traveling direction of the glass tube 1 at the same speed as the speed of the glass tube 1. Furthermore, it rotates at a constant speed or at a non-uniform speed.

  The support member 33 that supports the glass tube 1 when the cut flaw 12 is attached includes a support roller 33a that is rotatably attached to the support frame 33b with a rotation axis direction in a direction orthogonal to the transport direction A. Yes. The support roller 33a is such that at least the surface of the roller on which the glass tube 1 slides is formed of a material having high hardness, wear resistance and no magnetism, so that contact between the glass tube 1 and iron can be avoided. It has become.

  That is, the support roller 33a is, for example, a so-called hardened material such as die steel or die steel, which is surface hardened, or tungsten carbide alloy, austenitic wear-resistant sprayed stainless steel (Tungaroy: registered trademark), etc. It has been formed. Furthermore, when the supporting member 33 attaches the cut flaw 12 to the glass tube 1 with the scratching tool 22 by an attachment mechanism (not shown), the glass tube 1 that is bent by the contact of the scratching tool 22 can be smoothly bent in an appropriate bending state. Supports while sliding, and is not in contact with the traveling glass tube 1 except when it is scratched. For example, a gap of about 0.5 mm is formed between the surface of the support roller 33a of the support member 33 and the glass tube 1. It is provided to be.

  On the other hand, the cutting means 14 is positioned downstream of the conveying direction A according to the position of the cut flaw 12 attached to the outer wall surface of the glass tube 1 conveyed while rotating from the cut flaw forming means 32, for example, a glass tube When the cut flaw 12 attached to the outer wall surface of one tube is on the lower side when the cut length is conveyed, it is arranged at the cutting position at the lower side. Further, the cutting means 14 presses the outer wall surface of the glass tube 1 opposite to the cutting flaw 12 of the glass tube 1 at the cutting position, and the pressing roller 23 cuts the cutting flaw 12 so as to extend all around the circumferential tube. The glass tube 1 that is provided on the upstream side and the downstream side in the conveying direction A of the pressing roller 23 and that runs in the horizontal direction resists the pressing force so as to be a fulcrum at the time of cutting, for example, below The fulcrum rollers 24a and 24b also function as conveying rollers that are supported from the side.

  In the cutting device 31 configured as described above, the glass tube 1 continuously and linearly conveyed while being rotated in the horizontal direction by the conveying means 8 is first cut by the cut flaw forming means 32 on the outer wall of the tube. A cut wound 12 in a direction perpendicular to the tube axis on the side surface is a scratching tool 22 that moves in the running direction in synchronization with the glass tube 1 of the scratching mechanism 15, and is vertically moved by the receiving rollers 16 a and 16 b and the pressing rollers 17 a and 17 b Is attached so as to slide on the support member 33. Further, in the cut flaw forming means 32, when the glass tube 1 is transported and sent out from the cut flaw 12 previously attached by a predetermined cut length, the flaw tool 22 of the flaw mechanism 15 that operates intermittently is damaged again. By the operation, the next cut flaw 12 is applied in the same manner.

  Subsequently, the cut flaw 12 is attached by the cut flaw forming means 32, and the glass tube 1 conveyed to the cutting means 14 while rotating around the tube axis is pressed by the pressing means 23 and the two fulcrum rollers 24a. 24b, while being deformed so that it is pressed from the upper side and bent downward, the glass tube 1 is rotated halfway so that the cut flaw 12 is positioned substantially below the pressure roller 23, and the pressure roller 23 is cut flaw 12 When the tube outer wall surface on the opposite side is pressed, the cut flaw 12 extends to the entire circumference of the tube, and the glass tube 1 is cut.

  As described above, by forming as in the present embodiment, the same effects as in the above embodiment can be obtained.

  3rd Embodiment is described with the front view which shows the cutting device of the glass tube of FIG. The present embodiment is different from the first embodiment in cutting flaw formation means, and the same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted, and is different from the first embodiment. The configuration of this embodiment will be described.

  In FIG. 6, the cutting device 35 of the glass tube 1 is a small tube diameter glass having a tube outer diameter of about 1.2 mm to 10.0 mm, for example, according to the Danner method shown in FIG. 2 as in the first embodiment. The glass tube 1 is used for the cutting process of the glass tube 1 in the tube forming process, and is continuously drawn at a constant speed corresponding to the tube diameter in the direction of arrow A while rotating by the tube drawing device 5. Is cut into a predetermined length by the cutting device 35. Such a cutting device 35 is provided along the conveying direction A of the glass tube 1 by the conveying means 8, and a cut flaw forming means 36 for attaching the cut flaws 12 to the outer wall surface of the glass tube 1 at intervals equal to the cutting length, A cutting means 14 is provided at a position downstream of the cutting flaw forming means 36 in the conveying direction A and includes cutting means 14 that extends the cutting flaw 12 over the entire circumference of the glass tube 1 and cuts it to a predetermined length. .

  Then, the cut flaw forming means 36 located on the upstream side in the conveying direction A of the glass tube 1 includes a flaw mechanism 37 for intermittently attaching the cut flaw 12 to the glass tube 1, and a cut flaw on the glass tube 1 by the flaw mechanism 37. The receiving roller 16a is provided with a pair each on the upstream side and the downstream side in the transport direction A at the position where 12 is attached, and also acts as a transport roller for holding the glass tube 1 so as to be sandwiched from above and below while traveling in the horizontal direction, for example. , 16b, presser rollers 17a, 17b, and two receiving rollers 16a, 16b positioned on the lower side of the glass tube 1, and when the cut flaw 12 is made, the glass tube 1 traveling at the scratching position is slid. However, a flat support member 38 that supports the support surface 18a is provided.

  Further, the scratching mechanism 37 is, for example, above the position where the cut scratch 12 is applied, in the horizontal direction X in the drawing parallel to the conveyance direction A of the glass tube 1, and in two directions orthogonal thereto, that is, the vertical direction Y in the drawing, In addition, it is configured by attaching a scratching tool 40 of a blade such as a grindstone to a holding body 39 provided so as to be movable in each direction of the sheet orthogonal direction Z in the drawing so that the blade tip faces downward. By being comprised in this way, the holder 39 is operated so that it may be brought close to the glass tube 1 that travels the wound tool 40 and intermittently contacted at a scratch position at a predetermined time interval. Cutting flaws 12 are attached to the outer wall surface of the tube at intervals corresponding to a predetermined cutting length. In addition, the holding body 39 moves the attached wound tool 40 in the traveling direction of the glass tube 1 at the same speed as the speed of the glass tube 1 when attaching the cut wound 12 to the glass tube 1, and the original position after the damage is made. Is supposed to work back.

  Further, the support member 38 that supports the glass tube 1 when the cut flaw 12 is applied is a rectangular flat plate that is longitudinal in the transport direction A, like the support member 18 of the first embodiment, and a rectangular flat base 18b. A support plate 18d having a shape that is longer than the pedestal 18b and having an end in the transport direction A that is inclined downward from the support surface 18a that is the upper surface portion toward the outside, and a cross section in the transport direction A forms a trapezoid. It is provided to protrude. The support plate 18d has at least a support surface 18a formed of a material having high hardness and wear resistance and not having magnetism, so that contact between the glass tube 1 and iron can be avoided.

  Further, the support member 38 is attached to the upper end of the actuating rod 41 that moves up and down in the direction of arrow E of the attachment mechanism. The glass tube 1 bent by the contact of 40 is raised to a position at which the glass tube 1 can be supported on the support surface 18a while being smoothly slid in an appropriate bent state in accordance with the damage operation by the intermittent contact of the wound tool 40. In addition, except when being scratched, the glass tube 1 is lowered to a predetermined standby position below the glass tube 1 so as not to contact the traveling glass tube 1.

  On the other hand, the cutting means 14 is positioned downstream of the conveying direction A according to the position of the cut flaw 12 attached to the outer wall surface of the glass tube 1 conveyed while rotating from the cut flaw forming means 36, for example, a glass tube When the cut flaw 12 attached to the outer wall surface of one tube is on the lower side when the cut length is conveyed, it is arranged at the cutting position at the lower side. Further, the cutting means 14 presses the outer wall surface of the glass tube 1 opposite to the cutting flaw 12 of the glass tube 1 at the cutting position, and the pressing roller 23 cuts the cutting flaw 12 so as to extend all around the circumferential tube. The glass tube 1 that is provided on the upstream side and the downstream side in the conveying direction A of the pressing roller 23 and that runs in the horizontal direction resists the pressing force so as to be a fulcrum at the time of cutting, for example, below The fulcrum rollers 24a and 24b also function as conveying rollers that are supported from the side.

  In the cutting device 35 configured as described above, the glass tube 1 continuously and linearly conveyed while being rotated in the horizontal direction by the conveying means 8 is first cut on the outer wall of the tube by the cut flaw forming means 36. The cut wound 12 in the direction perpendicular to the tube axis on the side surface is a scratching tool 40 that moves in the running direction in synchronization with the glass tube 1 of the scratching mechanism 37, and the receiving roller 16a, 16b and the presser roller 17a, 17b are in the vertical direction. It is hold | maintained so that it may pinch | interpose, and it attaches, running so that the upper surface of the supporting member 38 may slide. Further, in the cut wound forming means 36, when the glass tube 1 is conveyed and sent out from the previously cut cut 12 by a predetermined cut length, the wound tool 40 of the wound mechanism 37 that operates intermittently is scratched again. By the operation, the next cut flaw 12 is applied in the same manner.

  Subsequently, the cut flaw 12 is attached by the cut flaw forming means 36, and the glass tube 1 conveyed to the cutting means 14 while rotating around the tube axis is pressed by the pressing means 23 and the two fulcrum rollers 24a. 24b, while being deformed so that it is pressed from the upper side and bent downward, the glass tube 1 is rotated halfway so that the cut flaw 12 is positioned substantially below the pressure roller 23, and the pressure roller 23 is cut flaw 12 When the tube outer wall surface on the opposite side is pressed, the cut flaw 12 extends to the entire circumference of the tube, and the glass tube 1 is cut.

  As described above, by forming as in the present embodiment, the same effects as in the above embodiment can be obtained.

  In each of the above-described embodiments, the cutting of the glass tube 1 having a small tube diameter has been described as an example. However, the cutting flaw forming means is a cutting that completely cuts the glass tube 1 in the cutting flaw forming means. You may make it apply to an apparatus.

It is a front view which shows the cutting device of the glass tube which is the 1st Embodiment of this invention. It is a figure which shows the formation process of the glass tube by the Danner method which concerns on the 1st Embodiment of this invention. It is a figure which shows the supporting member in the 1st Embodiment of this invention, Fig.3 (a) is a top view, FIG.3 (b) is a side view. It is a figure which shows the deformation | transformation form of the supporting member in the 1st Embodiment of this invention, Fig.4 (a) is a top view, FIG.4 (b) is a side view. It is a front view which shows the cutting device of the glass tube which is the 2nd Embodiment of this invention. It is a front view which shows the cutting device of the glass tube which is the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Glass tube 8 ... Conveyance means 12 ... Cutting wound 13 ... Cutting wound formation means 14 ... Cutting means 15 ... Damage mechanism 16a, 16b ... Receiving roller 17a, 17b ... Pressing roller 18 ... Supporting member 23 ... Pressing roller 24a, 24b ... Fulcrum roller

Claims (6)

A glass tube that cuts a glass tube, which is conveyed at a constant speed by a conveying means, into a predetermined length by making a cutting flaw at a predetermined position on the outer wall surface of the glass tube by a cutting flaw forming means provided along the conveying means. Cutting device,
The cutting flaw forming means includes a flaw mechanism that applies a flaw to the glass tube at intervals of a predetermined length when a flawed tool is intermittently in contact with the glass tube, and an upstream in a conveying direction of a position that damages the glass tube. At least one pair is provided on each of the side and the downstream side, and the glass tube that is bent by the contact of the scratching tool at the time of scratching is moved while the receiving roller and the pressing roller that hold the glass tube that is running at the time of scratching are sandwiched. A glass tube cutting device comprising a support member disposed between the receiving rollers so as to be supported and not in contact with the glass tube except when being damaged.   The glass tube cutting device according to claim 1, wherein the support member is a flat plate or a roller.   3. The glass tube cutting device according to claim 2, wherein the flat plate-like support member has an inclined surface that is inclined downward toward an outer peripheral portion of the upper surface.   2. The glass tube cutting device according to claim 1, wherein the surface of the supporting member is made of a material having high hardness, wear resistance and no magnetism.   2. The glass tube cutting device according to claim 1, wherein the glass tube is continuously drawn in a straight tube shape and is conveyed in a fixed direction in a forming step.   2. The glass tube cutting device according to claim 1, wherein the scratching tool of the scratching mechanism is formed to move in the transport direction at the same speed as the traveling speed of the glass tube at the time of scratching.

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