JP3640293B2 - Preform positioning device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a preform positioning apparatus, and more particularly to a preform positioning apparatus that positions a preform in the circumferential direction before the preform enters a blow molding portion in a stretch blow molding apparatus.
[0002]
[Background Art and Problems to be Solved by the Invention]
Generally, as a method for blow molding a container from a cylindrical preform (or parison), a method called a two-stage method (or cold parison method) and a method called a one-stage method (or hot parison method) There is.
[0003]
In the two-stage method, it is necessary to heat the preform at room temperature to a temperature at which blow molding is possible, that is, the so-called appropriate temperature for blow molding, and in the one-stage method, the preform retains heat during injection molding. Although it is not necessary to heat as long as a 2 stage system, it is necessary to heat more than blow molding suitable temperature.
[0004]
In any of these methods, the temperature raising and heating until reaching the appropriate temperature for blow molding is to uniformly heat the preform in the circumferential direction.
[0005]
On the other hand, when blow-molding a specially shaped container such as an elliptical or oval so-called flat container having a major axis and a minor axis in cross section, the preform is simply subjected to the heating and heating described above. In this case, for example, there are a portion that is largely stretched as on the long axis side and a portion that is not so stretched on the short axis side, so that a thin portion and a thick portion are generated in the container.
[0006]
For this reason, the thickness of the portion of the container that is largely stretched is secured by providing a temperature distribution that causes the temperature of the portion of the preform that is largely stretched to be lower than that of the other portion.
[0007]
However, even when such a temperature distribution is applied, it is difficult to sufficiently secure the thickness of a portion that is greatly stretched when a preform having a uniform thickness in the circumferential direction is used.
[0008]
In addition, when the preform is heated while being rotated, it is difficult to provide a temperature distribution in the circumferential direction.
[0009]
Furthermore, in order to impart a temperature distribution to the preform, it is necessary to add a temperature control device that performs local temperature control on the preform, which increases the size of the molding device and saves space. In addition to being able to plan, it is expensive.
[0010]
The object of the present invention is to provide a container that allows positioning of the preform in the circumferential direction before the preform having a wall thickness distribution in the circumferential direction is blow-molded to secure a sufficient thickness at a necessary portion. It is another object of the present invention to provide a preform positioning device that can be obtained and can save space and cost without increasing the size of the blow molding device.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the preform positioning apparatus of the present invention is a stretch blow molding apparatus in which a preform is held by a transport member and transported to a blow molding section to perform blow molding, wherein the preform is the blow molding section. A preform positioning device for positioning the preform in the circumferential direction before being conveyed to
A rotation mechanism for rotating the preform via the conveying member;
Preform positioning means for engaging in a circumferential direction with a stopper portion formed on the outer periphery of the preform to stop the rotation of the preform.
[0012]
According to the present invention, the preform is rotated through the conveying member by the rotation mechanism in a state where the conveying member holding the preform has been conveyed before the blow molding unit, and in this state, the preform positioning means serves as the preform. The preform is positioned in the circumferential direction by engaging the stopper portion formed on the outer periphery of the preform in the circumferential direction to stop the rotation of the preform.
[0013]
Therefore, regardless of the position of the stopper portion of the preform that has been conveyed in the circumferential direction, the preform can be reliably positioned in the circumferential direction, even if it has a thickness distribution in the circumferential direction. Even in the case of the preform, it is possible to easily and surely perform positioning in the circumferential direction and obtain a container having a sufficient thickness at a necessary portion.
[0014]
In addition, it is not necessary to add a temperature control device that performs local temperature control on the preform and has a simple structure, so that space saving and cost reduction can be achieved without increasing the size of the blow molding device. Can do.
[0015]
In the present invention, it is preferable that the stopper portions of the preform are formed at two positions corresponding to 180 ° on the outer periphery of the preform.
[0016]
By doing so, the preform can be positioned by rotation of 180 °, and the positioning time of the preform can be shortened.
[0017]
Further, in the present invention, the preform positioning means positions the preform until the rotation of the conveying member is stopped, thereby preventing the rotation of the preform after positioning, so that the blow molding unit can be reliably positioned. Can supply.
[0018]
Further, in the present invention, the preform positioning means is engaged with the preform by the advancing / retreating means, and is separated from the preform after stopping the rotation of the conveying member. Reliable positioning can be performed without any influence.
[0019]
Further, in the present invention, the preform positioning means includes a claw portion that engages with the stopper portion of the preform, and a biasing means that biases the claw portion in a contact direction with the preform. By doing so, the claw portion can be reliably engaged with the stopper portion of the preform while following a slight positional deviation of the preform.
[0020]
In this case, the claw portion is required to be brought into contact with the preform by allowing the rotation of the preform by a regulating member that regulates the position of contact with the preform, so that the claw portion is required by the biasing member It is preferable to prevent the rotation of the preform from being pressed against the preform as described above so that the positioning of the preform can be ensured.
[0021]
Furthermore, in the present invention, it is preferable that the preform positioning unit includes a conveying member positioning unit that engages with the conveying member to position the conveying member when the preform is positioned.
[0022]
By doing in this way, a conveyance member can be positioned reliably, the stop position of the preform hold | maintained at the conveyance member can be ensured, and positioning of the preform in the circumferential direction can be performed easily.
[0023]
In this case, the conveying member positioning means can follow the position of the conveying member by the urging means, and the conveying member positioning means and the preform positioning means are integrally provided, thereby conveying the conveying member. The member positioning means can follow the stop position of the conveying member, and the preform positioning means can reliably follow the preform held by the conveying member.
[0024]
In the present invention, the conveying member can be conveyed by a conveying chain, and a guide for regulating the position of the conveying chain is provided on the opposite side of the conveying chain from the preform positioning means. Thus, when the preform is positioned by the preform positioning means, the conveying member is prevented from moving, and the positioning with respect to the preform is surely performed.
[0025]
Further, in the present invention, the stretch blow molding apparatus has a heating part that heats the preform before the blow molding of the preform by the blow molding part, and is between the blow molding part and the heating part. It is preferable that a standby unit for waiting the preform is provided, and the preform is positioned in the circumferential direction in the standby unit.
[0026]
By doing so, it is possible to effectively utilize the empty space of the standby part, and to perform the circumferential positioning of the preform during the temperature relaxation of the preform in the standby part, thereby increasing the size of the blow molding device. Therefore, the space can be saved and the cost can be reduced.
[0027]
In the present invention, a plurality of the preform positioning means and the rotation mechanism are provided in accordance with the number of preforms to be blow-molded at the same time. However, it is possible to reliably perform circumferential positioning with respect to a preform that is simultaneously blow-molded.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0029]
1-5 is a figure which shows the stretch blow molding apparatus concerning one embodiment of this invention.
[0030]
FIG. 5 is a schematic plan view of the stretch blow molding apparatus.
[0031]
The stretch blow molding apparatus 10 is roughly divided into a preform molding station 14, a blow molding station 16, and a transfer station 18 located between the preform molding station 14 and the blow molding station 16 on a machine base 12. Is provided.
[0032]
The preform molding station 14 has injection core molds (not shown) at two positions 180 degrees apart from each other at a rotation angle. Have.
[0033]
In each stop position of the injection core mold, an injection molding part 24 is provided at a position facing the injection device 22, and an extraction part 26 is provided facing the injection molding part 24.
[0034]
The injection molding part 22 has an injection cavity mold (not shown) that is driven to be clamped relative to the injection core mold, and, for example, eight preforms 28 are simultaneously injection molded.
[0035]
On the other hand, in the take-out portion 26, the injection core mold can be driven to release relatively from the preform 28, and the preform 28 can be taken out from the injection core mold.
[0036]
In the present embodiment, the neck portion of the preform 28 is formed by a neck cavity mold (not shown), and the preform 28 is held by the neck cavity mold and the injection core mold and is rotated by the turntable 20. It is conveyed to the take-out part 26.
[0037]
And in the extraction part 26, the preform 28 is taken out by releasing the preform 28 from the neck cavity mold after the partial release of the injection core mold.
[0038]
Further, as shown in FIG. 1, a preform 28 formed by this injection molding includes a neck portion 28a including an opening and a bottomed body portion 28b connected to the neck portion 28a.
[0039]
Although the body portion 28b is not shown, a thick portion is formed at a position corresponding to 180 °, and two screw portions 28c are formed on the neck portion 28a as shown in FIGS. 2 and 4D. The two screw portions 28a are formed with notches 28d corresponding to the thick portions of the body portion at positions corresponding to 180 °, and two screw portions 28c are provided on both sides of each notch 28d. A stopper portion 28e for positioning the preform 28 to be connected in the circumferential direction is formed.
[0040]
The blow molding station 16 is attached to four transfer sprockets 30, a transfer chain 32 spanned between them, and a rack 35 attached to a transfer cylinder 34 that drives the transfer sprocket 30 and the transfer sprocket 30. It has a conveying means for circulating conveyance constituted by a not shown pinion or the like.
[0041]
A plurality of, for example, 36 transport members 36 are fixed to the transport chain 32 at a predetermined distance, and the preform 28 or the container is supported by each transport member 36.
[0042]
The conveying path of the conveying member 36 includes a receiving unit 40 that receives the preform 28 from the transfer station 18, a heating unit 42 that heats the preform 28 received by the receiving unit 40 to a temperature appropriate for blow molding, and a heating unit 42. There are provided a blow molding part 44 for obtaining a container by stretching and blow-molding the heated preform 28, and a container take-out part 46 for taking out the container blow-molded by the blow molding part 44 to the outside of the apparatus.
[0043]
A heating device 43 is disposed in the heating unit 42, and the heating device 43 is arranged with, for example, a plurality of infrared heaters extending along the conveyance path in the height direction of the preform, and is conveyed when passing through the heating device 43. A rotation sprocket 38 (see FIGS. 1 and 3) provided on the member 36 is engaged with a rotation chain (not shown) to rotate the preform 28 and rotate in the circumferential direction evenly.
[0044]
The blow molding unit 44 has a blow cavity mold 48 that is clamped to the preform 28 by a blow mold clamping mechanism 45, and, for example, four preforms 28 are blow molded.
[0045]
The container take-out unit 46 is configured to invert the container by the take-out device 47 and take it out in an upright state.
[0046]
The transfer station 18 delivers the preform 28 taken out from the takeout part 24 of the preform molding station 14 to the receiving part 40 of the blow molding station 16.
[0047]
At the take-out section 26 of the preform molding station 14, the number of preforms 28 simultaneously formed in the injection molding section 24 is taken out. At the transfer station 18, for example, eight preforms are taken out simultaneously at the take-out section 26. 28 is delivered to the receiving unit 40 four by four.
[0048]
Further, in the preform molding station 14, the preform 28 is injection-molded in an upright state, whereas in the transfer station 18, the preform 28 is turned upside down and the preform 28 is inverted on the blow molding station 16. Handing over in state.
[0049]
Further, at the blow molding station 16, the conveying member 36 is intermittently conveyed, and the heated preform 28 is intermittently stopped between the heating unit 42 and the blow molding unit 44 to temporarily stand by. It is set as the standby unit 50 to be activated.
[0050]
Then, the preform 28 heated by passing through the heating device 43 of the heating unit 42 is waited for a predetermined time by the standby unit 50, so that the temperature difference between the outer surface and the inner surface of the preform 28 can be reduced. ing.
[0051]
The standby unit 50 is in a state of being arranged at a corner portion of the circulation conveyance path of the conveyance member 36.
[0052]
The standby unit 50 is provided with a preform positioning device 52 for positioning the preform 28 conveyed from the heating unit 42 in the circumferential direction.
[0053]
In this way, the preform positioning device 52 is provided in the empty space of the standby unit 50 to effectively use the space, and is arranged outside the circulation conveyance path of the conveyance member 36, so that the circulation conveyance path with relatively few devices is provided. The space outside is effectively used.
[0054]
Further, as shown in FIGS. 1 and 3, the preform positioning device 52 is individually adapted to advance / retreat means corresponding to the four preforms 28 of the number of simultaneous blow moldings to be stopped by the standby unit 50. 54, a rotation mechanism 56, a conveying member positioning unit 58, and a preform positioning unit 60 are provided on a support base 62.
[0055]
As shown in FIG. 3, the support table 62 is disposed in an arc shape along the circulation conveyance path outside the circulation conveyance path of the conveyance member 36 at the standby unit 50 position.
[0056]
Further, as shown in FIG. 1, the support base 62 is attached to the machine base 12 with bolts 66 so that the distance of the support leg 64 can be adjusted with respect to the circulation conveyance path, and the mounting portion 68 with respect to the support leg 64. The bolt 70 and the long hole 72 are attached so that the height can be adjusted.
[0057]
Each forward / backward moving means 54 has an air cylinder 76, a guide rail 78, a linear guide 80, and a slide plate 82.
[0058]
The air cylinder 76 is mounted on the mounting portion 68 with the cylinder rod 74 facing the transport members 36.
[0059]
A pair of guide rails 78 are attached on the air cylinder 76 toward the respective conveying members 36.
[0060]
The linear guide 80 is attached to the lower surface side of the slide plate 82 and is slidably engaged with the guide rail 78.
[0061]
The slide plate 82 has a connecting plate 84 projecting from the lower surface, and the connecting plate 84 is connected to the tip of the cylinder rod 74, and can be moved forward and backward with respect to the conveying member 36 by driving the air cylinder 76. Has been.
[0062]
Each rotating mechanism 56 includes a motor 86, a sprocket 88 for rotating the transport member 36, and a chain 90.
[0063]
The motor 86 is attached to the upper surface of the slide plate 82, and its output shaft 92 is projected through the lower surface side of the slide plate 82, and the gear 94 is attached to the lower end thereof.
[0064]
The sprocket 88 is rotatably attached to the lower surface side of the slide plate 82, and the gear 96 integrally attached to the shaft of the sprocket 88 meshes with the gear 94 on the motor 86 side so that the sprocket 88 is rotatable. Yes.
[0065]
The chain 90 is attached to the outer periphery of the sprocket 88 and is engaged with the rotation sprocket 38 of the conveying member 36 by the advance of the slide plate 82 to rotate the conveying member 36.
[0066]
As shown in FIG. 2, each transport member positioning unit 58 includes a fixed support member 98, a movable support member 100, and a positioning member 102 for the transport member 36.
[0067]
The fixed support member 98 is attached and fixed in a suspended state to the distal end portion of the slide plate 82, and the lower end portion protrudes forward in an L shape.
[0068]
The movable support member 100 is attached to the lower end portion of the fixed support member 98 protruding in an L shape so as to be rotatable in the horizontal direction by a bolt 104, and the front end portion protrudes toward the conveying member 36.
[0069]
The positioning member 102 for the conveying member 36 is attached to the front end portion of the movable support member 100 by a pair of bolts 106.
[0070]
The positioning member 102 has a mounting hole that allows the bolt 106 to be inserted in a state in which the bolt 106 has play, and a collar is mounted between the bolt 106 and the movable support member 100. It can be moved back and forth and left and right.
[0071]
Further, a pair of springs 108 as urging means are mounted between the positioning member 102 and the movable support member 100 and are urged forward.
[0072]
Further, an arcuate engagement portion 110 corresponding to the outer shape of the conveyance member 36 is formed at the tip of the positioning member 102, and the engagement portion 110 is engaged with the conveyance member 36 by the advance of the slide plate 82, and the conveyance is performed. The member 36 is positioned.
[0073]
As shown in FIG. 3, the two transport members 36 at the center of the four transport members are stopped at the position of the sprocket 30, and even if the positioning member 102 is engaged, the sprocket 30 causes the transport chain 32 to be engaged. Since the position is restricted, the conveying member 36 is not pushed and moved.
[0074]
On the other hand, the two outer conveying members 36 are out of the position of the sprocket 30 and there is nothing that regulates the position of the conveying chain 32. Therefore, the guide 112 is extended to the position corresponding to each positioning member 102, and the positioning member The movement of the conveying member 36 at the time of engaging 102 is prevented.
[0075]
As shown in FIGS. 2 and 4, each preform positioning means 60 includes a preform positioning member 114, a spring 116 as an urging means, and a stopper 118 as a regulating member.
[0076]
The preform positioning member 114 is substantially T-shaped and is attached to a support portion 120 protruding upward from the positioning member 102 so as to be rotatable in a horizontal direction via a bolt 122, and the T-shaped head is positioned in the front-rear direction. The T-shaped leg is positioned in the left-right direction.
[0077]
A claw portion 124 having a taper with one side corresponding to the outer shape of the neck portion 28a of the preform 28 is formed at the front end portion of the T-shaped head, and the tip of the claw portion 124 is connected to the stopper portion 28e of the neck portion 28a. By engaging, the circumferential positioning of the preform 28 is performed.
[0078]
Further, the length and angle of the taper of the claw portion 124 are determined so that the two stopper portions 28e do not enter the notch portion 28d when the claw portion 124 contacts the stopper portion 28e when contacting the neck portion 28. It is set to the extent that it can get over.
[0079]
As shown in FIG. 4, the spring 116 is disposed between the support portion 120 and the T-shaped head portion of the preform positioning member 114, and biases the claw portion 124 toward the front side so that the neck portion of the preform 28. It can be brought into contact with 28a.
[0080]
The stopper 118 is disposed on the support portion 120 so as to be able to come into contact with the T-shaped leg portion of the preform positioning member 114, and when the claw portion 124 comes into contact with the neck portion 28a by the biasing force of the spring 116, The contact position of the claw portion 124 is regulated so that the rotation of the preform 28 can be stopped by the urging force to prevent the preform 28 from being engaged with the stopper portion 28e.
[0081]
As shown in FIG. 2, the preform 28 is held on the mounting table 36a with the support pins 36b protruding upward from the mounting table 36a of the conveying member 36 being inserted into the neck portion 28a. The rotation of the member 36 is enabled.
[0082]
Next, the operation state of such a preform positioning device will be described.
[0083]
First, the preform 28 held by the transport member 36 is heated by the heating unit 42, and then intermittently transported to the standby unit 50 by the transport chain 32 and stopped.
[0084]
In this case, the preform positioning device 52 is in a state in which each slide plate 82 is retracted, and each conveying member 36 and preform 28 are shown in FIG. 3 without being engaged with the preform positioning device 52. Thus, it will be located in a corner shape around the sprocket 30.
[0085]
In this state, the air cylinder 76 of each advance / retreat means 54 arranged corresponding to each conveyance member 36 is driven, and the slide plate 82 is advanced along the guide rail 78 toward each conveyance member 36 by the cylinder rod 74. .
[0086]
In this case, the motor 86 of the rotating mechanism 56 is driven while moving forward, and the sprocket 88 and the chain 90 are rotated counterclockwise as shown in FIG. 3, for example.
[0087]
When the forward movement of the slide plate 82 is completed, the chain 90 on the outer periphery of the sprocket 88 engages with the sprocket 38 for rotation of the conveying member 36, and the conveying member 36 rotates clockwise, for example, as shown in FIG. The preform 28 also rotates in the same direction, the positioning member 102 of the conveying member positioning means 60 is engaged with the conveying member 36, and the preform positioning member 114 of the preform positioning means 60 is the neck portion 28a of the preform 28. Contact with.
[0088]
In this case, even when there is a slight shift in the stop position of the conveying member 36, the positioning member 102 biased by the spring 108 moves following the conveying member 36 as shown in FIG.
[0089]
The preform positioning member 114 moves along with the position of the conveying member 36 together with the positioning member 102 and follows the position of the preform 28 in the shape of the conveying member 36, and the contact of the preform 28 with the neck portion 28 a is not performed. It will be done reliably.
[0090]
Moreover, even if the claw portion 124 of the preform positioning member 114 first contacts the stopper portion 28e of the neck portion 28, as shown in FIG. The positioning member 114 moves and gets over the stopper portion 28e without entering the notch portion 28d between the stopper portions 28e, and reliably comes into contact with the surface of the neck portion 28 between the screw portions 28c.
[0091]
When the preform 28 further rotates in this state, the claw portion 124 engages with the stopper portion 28e of the neck portion 28 as shown in FIG. The rotation is stopped and the preform 28 is positioned in the circumferential direction.
[0092]
The rotation of the preform 28 requires an amount so that the claw portion 124 and the stopper portion 28e can be surely positioned so that the claw portion 124 can be surely positioned. In the present embodiment, the stopper portion 28e has 2 pieces. Since it is provided at a location, it must be rotated 180 ° or more. Preferably, it is 1 rotation (360 °) or more.
[0093]
By this positioning, the preform 28 is in a state where the thick portion of the body portion 28b is positioned along the transport direction.
[0094]
In this state, the motor 86 of the rotation mechanism 56 is stopped, and the rotation of the conveying member 36 is stopped. Then, the slide plate 82 is retracted by the air cylinder 76, and the positioning member 102 and the preform positioning member 114 are engaged. If it cancels | releases, the positioning state in the circumferential direction of the preform 28 can be maintained.
[0095]
In this state, if the conveying member 36 and the preform 28 are conveyed to the blow molding unit by the conveying chain 32 and blow-molded, a good flat container or the like can be easily obtained.
[0096]
In this case, in the blow molding unit 44, by using a blow cavity mold 48 having a cavity surface with a long axis along the conveying direction, good air bleeding can be achieved and the moldability can be improved. In addition, positioning of the preform 28 at the time of blow molding can be easily performed using the stopper portion 28e.
[0097]
Furthermore, by arranging a thick-walled portion where the amount of heat of the body portion 28b of the preform 28 is small and difficult to extend along the long axis of the blow cavity mold 48 along the conveying direction, it is sufficient for the long-axis side end portion of the flat container. The wall thickness can be secured.
[0098]
The present invention is not limited to the above-described embodiment, and can be changed to various embodiments within the scope of the gist of the present invention.
[0099]
For example, the present invention can be applied to both a one-stage stretch blow molding apparatus and a two-stage stretch blow molding apparatus, and is a type 1 that has a large amount of heat in a thick portion and a small amount of heat. In the case of a stage stretch blow molding apparatus, a two-stage stretch blow molding apparatus that can be sufficiently stretched when the thick portion is disposed on the short axis side and that has a large amount of heat as in the present embodiment. In this case, since the thick portion has a smaller amount of heat than the thin portion, if the thick portion is arranged on the long axis side, it is difficult to stretch, so that a sufficient thickness can be secured.
[0100]
In the present embodiment, the stopper portion protrudes from the neck portion. However, the stopper portion may be a concave hole. In this case, the claw portion may be shaped so as to enter the hole. . In such a case, the advancing / retreating means of the positioning means may be added with an air cylinder or the like so as to advance / retreat not only in the conveyance direction but also in the conveyance direction.
[0101]
Furthermore, in the present embodiment, the stopper portion is provided at the neck portion, but the stopper portion is not limited to the neck portion, and may be provided on the trunk portion or the like as long as there is no product-like problem. For example, in the case of a product having a support ring at the lower end of the neck part, a stopper part may be provided directly outside the support ring and outside the body part with little blow molding.
[0102]
Moreover, although the rotation mechanism in this Embodiment utilized the sprocket for rotation of a conveyance member, it may contact with a conveyance member from the downward direction of a conveyance member, for example, and may be rotated by friction.
[0103]
Furthermore, in the above-described embodiment, a case has been described in which eight preforms are injection-molded in the injection molding section and four preforms are blow-molded in the blow molding section. In addition, the standby part can be arranged not only in the corner part but also in the straight part.
[0104]
Further, when the preform positioning device is disposed in the linear portion, it is not necessary to individually provide each positioning means or the like with respect to the conveying member, and it is possible to make them integral.
[Brief description of the drawings]
FIG. 1 is an enlarged side view showing a preform positioning device in the injection stretch blow molding device of FIG.
FIG. 2 is an enlarged view of a main part of the preform positioning device of FIG.
3 is a plan view of FIG. 1. FIG.
FIGS. 4A to 4D are enlarged plan views showing states at the time of positioning of the conveying member positioning unit and the preform positioning unit. FIGS.
FIG. 5 is a schematic plan view of an injection stretch blow molding apparatus using the preform positioning apparatus of the present invention.
[Explanation of symbols]
10 Stretch blow molding equipment
16 Blow molding station
28 preform
28e Stopper
32 Conveyor chain
36 Conveying member
42 Heating section
44 Blow molding part
50 standby section
52 Preform positioning device
54 Retreat means
56 Rotating mechanism
58 Conveying member positioning means
60 Preform positioning means
102 Positioning member
108 spring
112 Guide
114 Preform positioning member
116 Spring
124 Claw

Claims (11)

In a stretch blow molding apparatus in which a preform is held by a transport member and transported to a blow molding section to perform blow molding, the preform is positioned in the circumferential direction before the preform is transported to the blow molding section. A preform positioning device,
A rotation mechanism for rotating the preform via the conveying member;
A preform positioning device comprising: a preform positioning means for engaging in a circumferential direction with a stopper portion formed on the outer periphery of the preform to stop the rotation of the preform. In claim 1,
The preform positioning device is characterized in that the preform stoppers are formed at two positions corresponding to 180 ° on the outer periphery of the preform. In claim 1 or 2,
The preform positioning device is configured to position the preform until the rotation of the conveying member is stopped. In any one of Claims 1-3,
The preform positioning device is engaged with the preform by an advancing / retracting device, and is separated from the preform after the conveyance member stops rotating. In any one of Claims 1-4,
The preform positioning means includes a claw portion that engages with a stopper portion of the preform,
A preform positioning apparatus, comprising: an urging means for urging the claw portion in a contact direction with the preform. In claim 5,
The preform positioning apparatus, wherein the claw portion is allowed to contact the preform while allowing rotation of the preform by a regulating member that regulates a contact position with respect to the preform. In any one of Claims 1-6,
A preform positioning apparatus, comprising: a conveying member positioning unit that engages with the conveying member to position the conveying member when the preform positioning unit positions the preform. In claim 7,
The conveying member positioning means can follow the position of the conveying member by an urging means,
The preform positioning apparatus, wherein the conveying member positioning means and the preform positioning means are integrally provided. In any one of Claims 1-8,
The transport member can be transported by a transport chain;
A preform positioning device, characterized in that a guide for regulating the position of the conveying chain is provided on the opposite side of the conveying chain from the preform positioning means. In any one of Claims 1-9,
The stretch blow molding apparatus has a heating unit that heats the preform before blow molding of the preform by the blow molding unit,
Having a standby part for waiting the preform between the blow molding part and the heating part;
A preform positioning device that performs circumferential positioning of the preform in the standby section. In any one of Claims 1-10,
A preform positioning apparatus, wherein a plurality of the preform positioning means and the rotation mechanism are provided according to the number of preforms to be blow-molded simultaneously.

Images