JP2000202899A - Preform positioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a preform positioning device capable of positioning a preform in the peripheral direction thereof before the blow molding of the preform to which wall thickness distribution is applied in the peripheral direction to obtain a container wherein sufficient wall thickness is ensured in a necessary portion and capable of achieving the conservation of a space and cost reduction without making a blow molding apparatus large-scale. SOLUTION: In a stretch blow molding apparatus holding a preform 28 by a feed member 36 to feed the same to a blow molding portion to perform blow molding, before the preform 28 is fed to a blow molding part, the positioning in the peripheral direction of the preform 28 is performed. A preform positioning device 52 has a rotary mechanism 56 allowing the preform 28 to turn on its axis through the feed member 36 and a preform positioning means 60 engaged with the stopper part formed to the outer periphery of the preform 28 in the peripheral direction to stop the rotation of the preform 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preform positioning apparatus, and more particularly, to a preform positioning apparatus for positioning a preform in a stretch blow molding apparatus in a circumferential direction before the preform enters a blow molding section.

[0002]

BACKGROUND OF THE INVENTION In general,
Methods for blow molding a container from a cylindrical preform (or parison) include a method called a two-stage method (or a cold parison method) and a method called a one-stage method (or a hot parison method). is there.

In the two-stage method, it is necessary to heat a preform at room temperature to a temperature at which blow molding can be performed, that is, a so-called appropriate temperature for blow molding.
Since the preform retains heat during injection molding, 2
It is not necessary to heat for as long a time as in the stage method, but it is necessary to heat it to an appropriate temperature or higher for blow molding.

[0004] In any of these methods, the heating for raising the temperature to the appropriate temperature for blow molding is to uniformly heat the preform in the circumferential direction.

On the other hand, when blow molding a container having a special shape such as an elliptical or elliptical so-called flat container having a major axis and a minor axis in a cross section, only the above-mentioned heating and heating are performed. In the preform, for example, there are a portion that is greatly stretched such as a long axis side and a portion that is not so stretched such as a short axis side, so that a thin portion and a thick portion are generated in a container. Become.

For this reason, by providing a temperature distribution such that the temperature of the largely stretched portion of the preform is lower than that of the other portions, the thickness of the greatly stretched portion of the container is ensured. .

However, even when such a temperature distribution is provided, it is difficult to sufficiently secure the thickness of a largely stretched portion when a preform having a uniform circumferential thickness is used. .

When the preform is heated while being rotated, it is difficult to provide a temperature distribution in the circumferential direction.

Further, in order to impart a temperature distribution to the preform, a temperature control device for performing local temperature control on the preform must be added. In this case, the molding device becomes large, and the size of the preform can be reduced. It is not possible to increase the space, and the cost increases.

[0010] An object of the present invention is to make it possible to position the preform in the circumferential direction before the preform having the circumferential thickness distribution is blow-molded, and to secure a sufficient thickness in necessary portions. Another object of the present invention is to provide a preform positioning device which can obtain a container having a reduced size and can save space and reduce costs without increasing the size of the blow molding device.

[0011]

In order to achieve the above object, a preform positioning apparatus according to the present invention is directed to a stretch blow molding apparatus that holds a preform by a conveying member, conveys the preform to a blow molding section, and performs blow molding. A preform positioning device that positions the preform in a circumferential direction before the preform is conveyed to the blow molding unit, and a rotation mechanism that rotates the preform through the conveyance member, And a preform positioning means for circumferentially engaging a stopper formed on the outer periphery of the preform to stop rotation of the preform.

According to the present invention, the preform is rotated via the conveying member by the rotating mechanism while the conveying member holding the preform is being conveyed to the front of the blow molding section. Engages a stopper formed on the outer periphery of the preform in the circumferential direction to stop the rotation of the preform, thereby performing the circumferential positioning of the preform.

Therefore, regardless of the position of the stopper portion of the conveyed preform in any position in the circumferential direction, the preform can be reliably positioned in the circumferential direction. Even in the case of a preform having a distribution, it is possible to easily and reliably perform positioning in the circumferential direction and obtain a container having a sufficient thickness at a necessary portion.

Further, it is not necessary to add a temperature control device for performing local temperature control on the preform, and the structure is simple.
Space saving and cost reduction can be achieved.

In the present invention, it is preferable that stopper portions of the preform are formed at two positions corresponding to 180 ° on the outer periphery of the preform.

By doing so, the preform can be positioned by 180 ° rotation, and the preform positioning time can be shortened.

Further, in the present invention, the preform positioning means positions the preform until rotation of the transport member stops, thereby preventing rotation of the preform after positioning, and blowing the preform in a reliable positioning state. Can be supplied to the molding section.

Further, in the present invention, the preform positioning means is engaged with the preform by a reciprocating means, and is separated from the preform after rotation of the transport member is stopped. Can be reliably positioned without affecting the transport of the paper.

In the present invention, the preform positioning means includes a claw engaging with a stopper of the preform, and an urging means for urging the claw in a contact direction with the preform. With such a configuration, the claw portion can be reliably engaged with the stopper portion of the preform while following a slight displacement of the preform or the like.

In this case, the claw is biased by allowing the rotation of the preform and allowing the claw to come into contact with the preform by a regulating member for regulating a contact position with respect to the preform. It is preferable that the member is prevented from being pressed against the preform more than necessary to prevent the rotation of the preform, so that the positioning of the preform can be ensured.

Further, in the present invention, it is preferable that the preform positioning means has a conveying member positioning means for engaging with the conveying member and positioning the conveying member when positioning the preform.

By doing so, it is possible to reliably position the conveying member, secure the stop position of the preform held by the conveying member, and facilitate the positioning of the preform in the circumferential direction. it can.

In this case, the conveying member positioning means includes:
By making it possible to follow the position of the transport member by the urging means, and by providing the transport member positioning means and the preform positioning means integrally, the transport member positioning means is moved to the stop position of the transport member. While following, the preform positioning means can also reliably follow the preform held by the transport member.

Further, in the present invention, the transport member can be transported by a transport chain, and a guide for regulating the position of the transport chain is provided on a side of the transport chain opposite to the preform positioning means. By providing the preform, when the preform is positioned by the preform positioning means, the transport member is prevented from moving, and the positioning with respect to the preform is performed reliably.

Further, in the present invention, the stretch blow molding apparatus has a heating unit for heating the preform before the blow molding of the preform by the blow molding unit. It is preferable that a standby unit for waiting the preform be provided between the preforms, and that the preform be positioned circumferentially in the standby unit.

By doing so, the preform can be positioned in the circumferential direction while the temperature of the preform is relaxed in the standby section by effectively utilizing the empty space in the standby section. Without increasing the size,
Space can be saved and cost can be reduced.

Further, in the present invention, the preform positioning means and the rotation mechanism are provided in plurality in accordance with the number of preforms to be blow-molded at the same time, so that the position at which the conveying member stops conveying the preform is determined. Regardless of the method, the positioning in the circumferential direction can be reliably performed on the preform to be blow-molded at the same time.

[0028]

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

FIGS. 1 to 5 are views showing a stretch blow molding apparatus according to one embodiment of the present invention.

FIG. 5 is a schematic plan view of a stretch blow molding apparatus.

The stretch blow molding apparatus 10 includes a machine base 12
Above, roughly, the 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.

The preform molding station 14 has injection core molds (not shown) at two positions separated by a rotation angle of 180 °, and rotates the injection core mold intermittently in a circulating manner along a rotary conveyance path. It has a board 20.

At each stop position of the injection core mold, an injection molding portion 24 is provided at a position facing the injection device 22.
Is provided, and an ejection portion 26 is opposed to the injection molding portion 24.
Is provided.

The injection molding part 22 is an injection cavity mold (not shown) which is driven to clamp relative to the injection core mold.
For example, eight preforms 28 are injection-molded simultaneously.

On the other hand, in the take-out section 26, the preform 28 can be taken out from the injection core mold by driving the injection core mold relatively to the preform 28.

In the present embodiment, the neck of the preform 28 is formed by a neck cavity mold (not shown), and the preform 28 is held and rotated by the neck cavity mold and the injection core mold. The board 20 is transported to the take-out section 26.

In the take-out section 26, after the injection core mold is partially released, the preform 28 is released from the neck cavity mold so that the preform 28 is taken out.

As shown in FIG. 1, the preform 28 formed by the injection molding includes a neck portion 28a including an opening and a bottomed body portion 28b connected to the neck portion 28a.

Although not shown, the body portion 28b has a thick portion formed at a position corresponding to 180 °, and the neck portion 28a has two screws as shown in FIGS. 2 and 4D. Part 2
8c are formed, and these two threaded portions 28a correspond to the thick portions of the body portion, and the cutout portions 28 are formed at positions corresponding to 180 °.
d is formed, and a stopper portion 28e is formed on both sides of each cutout portion 28d for positioning the preform 28 connecting the two screw portions 28c in the circumferential direction.

The blow molding station 16 comprises four transport sprockets 30, a transport chain 32 stretched over them, a rack 35 attached to a transport cylinder 34 for driving the transport sprocket 30, and a transport sprocket. 30 has a transporting means for circulating transport constituted by a pinion or the like (not shown) attached to 30.

A plurality of, for example, 36 transfer members 36 are fixed to the transfer chain 32 at a predetermined distance, and the preform 28 or the container is supported by each transfer member 36.

The transfer path of the transfer member 36 includes a receiving section 40 for receiving the preform 28 from the transfer station 18, a heating section 42 for heating the preform 28 received by the receiving section 40 to a temperature suitable for blow molding, and a heating section 42. Part 42
A blow molding unit 44 for obtaining a container by stretch-blowing the preform 28 heated by the method described above, and a container take-out unit 46 for taking out the container blow-molded by the blow molding unit 44 to the outside of the apparatus are provided.

A heating device 43 is disposed in the heating section 42. The heating device 43 is provided with, for example, a plurality of infrared heaters extending along a conveying path arranged in the height direction of the preform, and passes through the heating device 43. At this time, the rotation sprocket 38 provided on the transport member 36 (see FIGS. 1 and 3).
Meshes with a rotation chain (not shown) to
Is rotated in the circumferential direction so as to be evenly heated.

The blow molding section 44 includes a blow mold clamping mechanism 4.
5 has a blow cavity mold 48 which is clamped to the preform 28. For example, four preforms 28 are blow-molded.

The container take-out section 46 is operated by a take-out device 47
The container is turned upside down and removed in an upright state.

The transfer station 18 transfers the preform 28 taken out from the take-out section 24 of the preform molding station 14 to the receiving section 40 of the blow molding station 16.

At the take-out section 26 of the preform molding station 14, the preforms 28 of the same number as the injection molding section 24 are taken out. At the transfer station 18, for example, eight preforms 28 are taken out at the same time. The preforms 28 are transferred to the receiving unit 40 four by four.

The preform molding station 14
, The preform 28 is injection-molded in an upright state, whereas the transfer station 18
8, the preform 28 is delivered to the blow molding station 16 in an inverted state.

Further, in the blow molding station 16, the transport member 36 is in an intermittent transport state.
A space between the heating unit 42 and the blow molding unit 44 is set as a standby unit 50 that intermittently stops the heated preform 28 and temporarily waits.

The preform 28 that has passed through the heating device 43 of the heating unit 42 and is heated in the standby unit 50 is kept on standby for a certain period of time, so that the temperature difference between the outer surface and the inner surface of the preform 28 can be reduced. It has become.

The standby section 50 is located at a corner of the circulating transport path of the transport member 36.

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.

As described above, the preform positioning device 5
2 is provided in a vacant space of the standby unit 50 for effective use of the space, and is disposed outside the circulation conveyance path of the conveyance member 36 to effectively use the space outside the circulation conveyance path with relatively few devices. Like that.

The preform positioning device 52
As shown in FIGS. 1 and 3, the advance / retreat means 54 and the rotation mechanism 56 correspond to the four preforms 28 of the number of blow-molded at the same time to be conveyed to the standby section 50.
And a transfer member positioning means 58 and a preform positioning means 60 on a support 62.

As shown in FIG. 3, the support table 62 is arranged in an arc shape along the circulation transport path outside the circulation transport path of the transport member 36 at the position of the standby section 50.

Further, as shown in FIG. 1, a support leg 64 is attached to the machine base 12 by a bolt 66 so that the distance between the support leg 64 and the circulating conveyance path can be adjusted. 64 and bolt 70 and slot 72
It is attached so that the height can be adjusted.

Each advance / retreat means 54 is provided with an air cylinder 76.
, A guide rail 78, a linear guide 80, and a slide plate 82.

The air cylinder 76 includes a cylinder rod 74
Are mounted on the mounting section 68 with the.

A pair of guide rails 78 are mounted on the air cylinder 76 toward the respective transport members 36.

The linear guide 80 is attached to the lower surface of the slide plate 82 and is slidably engaged with the guide rail 78.

The slide plate 82 has a connecting plate 84 protruding from the lower surface thereof, and the connecting plate 84 is connected to the tip of the cylinder rod 74. It has been made movable.

Each rotation mechanism 56 has a motor 86, a sprocket 88 for rotating the conveying member 36 and a chain 90.

The motor 86 is mounted on the upper surface of the slide plate 82, with its output shaft 92 protruding through the lower surface of the slide plate 82 and a gear 94 mounted on the lower end thereof.

The sprocket 88 is rotatably mounted on the lower surface side of the slide plate 82, and a gear 96 integrally mounted on the shaft of the sprocket 88 meshes with a gear 94 on the motor 86 to rotate the sprocket 88. Has been.

The chain 90 is mounted on the outer periphery of the sprocket 88, and the transport member 36 is moved by the advance of the slide plate 82.
Is engaged with the rotation sprocket 38 to rotate the conveying member 36.

As shown in FIG. 2, each transport member positioning means 58 includes a fixed support member 98 and a movable support member 100.
And a positioning member 102 for the transport member 36.

The fixed support member 98 is attached and fixed to the leading end of the slide plate 82 in a hanging state, and has a lower end protruding forward in an L-shape.

The movable support member 100 includes a fixed support member 98.
Is attached by a bolt 104 so as to be rotatable in a horizontal direction on a lower end portion protruding in an L-shape, and a front end portion thereof
It protrudes to the side.

The positioning member 102 for the transport member 36 is
The movable support member 100 is mounted on a front end portion by a pair of bolts 106.

The positioning member 102 includes a bolt 106
At the mounting position, there is a mounting hole that allows the bolt 106 to be inserted with play provided, and a collar is mounted between the mounting hole and the bolt 106 so as to be movable in the front-rear and left-right directions with respect to the movable support member 100. Have been.

A pair of springs 1 as urging means is provided between the positioning member 102 and the movable support member 100.
08 is mounted and is urged forward.

Further, at the tip of the positioning member 102,
An arcuate engaging portion 110 corresponding to the outer shape of the conveying member 36 is formed.
Are engaged with the transport member 36 to position the transport member 36.

Further, 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 two transport members 36 are transported by the sprocket 30. Since the position of the supply chain 32 is regulated, the transport member 36 is not pushed and moved.

On the other hand, the outer two transport members 36
The guide 112 is extended from the position of the sprocket 30 to the position corresponding to each of the positioning members 102 because there is nothing to restrict the position of the transfer chain 32, and the movement of the transfer member 36 when the positioning member 102 is engaged is controlled. I try to prevent it.

Each preform positioning means 60 is the same as that shown in FIG.
And as shown in FIG. 4, the preform positioning member 11
4, a spring 116 as an urging means, and a stopper 118 as a regulating member.

The preform positioning member 114 has a substantially T-shape, and is rotatably mounted in a horizontal direction via a bolt 122 on a supporting portion 120 protruding above the positioning member 102, and has a T-shaped front and rear portion. Direction,
The T-shaped leg is located in the left-right direction.

At the front end of the T-shaped head, a claw portion 124 having a tapered surface whose one surface corresponds to the outer shape of the neck portion 28a of the preform 28 is formed. By engaging with the portion 28e, the preform 28 is positioned in the circumferential direction.

The length and angle of the taper of the claw portion 124 are such that when the claw portion 124 contacts the stopper portion 28e when the claw portion 124 contacts the neck portion 28, the two claw portions 124 do not enter the cutout portion 28d. It is set to such an extent that it can get over the stopper 28e.

The spring 116, as shown in FIG.
Arranged between the support part 120 and the T-shaped head of the preform positioning member 114, the claw part 124 is urged forward so as to be able to abut on the neck part 28a of the preform 28.

The stopper 118 is disposed on the support portion 120 so as to be able to abut on the T-shaped leg of the preform positioning member 114, and when the claw portion 124 comes into contact with the neck portion 28a by the urging force of the spring 116. Then, the rotation of the preform 28 is stopped by the urging force,
e so that it is possible to prevent the engagement with the
The contact position of No. 4 is regulated.

As shown in FIG. 2, the preform 28 is held on the mounting table 36a with the support pins 36b projecting upward from the mounting table 36a of the transport member 36 inserted into the neck 28a. The transport member 36 is rotatable with the rotation of the transport member 36.

Next, the operation of such a preform positioning device will be described.

First, after the preform 28 held by the transport member 36 is heated by the heating unit 42, the preform 28 is intermittently transported to the standby unit 50 by the transport chain 32 and stopped.

In this case, the preform positioning device 52
Is in a state where each slide plate 82 is retracted,
Each of the conveying members 36 and the preform 28 are not engaged with the preform positioning device 52, but are positioned in a corner around the sprocket 30, as shown in FIG.

In this state, the air cylinder 76 of each reciprocating means 54 arranged corresponding to each transport member 36 is driven, and the slide plate 82 is moved by the cylinder rod 74 along the guide rail 78 toward each transport member 36. And move forward.

In this case, the sprocket 88 and the chain 90 are rotated counterclockwise, for example, as shown in FIG. 3, by driving the motor 86 of the rotating mechanism 56 while moving forward.

When the advance of the slide plate 82 is completed, the chain 90 on the outer periphery of the sprocket 88 is engaged with the rotation sprocket 38 of the conveying member 36, and the conveying member 36 rotates clockwise as shown in FIG. As a result, the preform 28 also rotates in the same direction, the positioning member 102 of the transport member positioning means 60 engages with the transport member 36, and the preform positioning member 114 of the preform positioning means 60 Neck part 2
8a.

In this case, even if the stop position of the transport member 36 is slightly shifted, the positioning member 102 urged by the spring 108 follows the transport member 36 as shown in FIG. Moving.

The preform positioning member 114 moves together with the positioning member 102 to follow the position of the transport member 36, and follows the position of the preform 28 in the shape of the transport member 36, and moves to the neck 28 a of the preform 28. Is surely performed.

Moreover, the preform positioning member 114
Even if the claw portion 124 contacts the stopper portion 28e of the neck portion 28 first, the preform positioning member 114 is moved by the arc-shaped contact portion of the claw portion 124 as shown in FIG. Therefore, the stopper 28e does not enter the notch 28d between the stoppers 28e, gets over the stopper 28e, and reliably contacts the surface of the neck 28 between the screw portions 28c.

In this state, when the preform 28 further rotates, the pawl portion 124 engages with the stopper portion 28e of the neck portion 28 as shown in FIG. The rotation of the reform 28 is stopped, and the preform 28 is positioned in the circumferential direction.

The rotation of the preform 28 requires an amount sufficient to reliably position the claw 124 and the stopper 28e so that the claw 124 is reliably positioned.
In the present embodiment, since two stopper portions 28e are provided, rotation of 180 ° or more is required.
Preferably, it is one rotation (360 °) or more.

By this positioning, the preform 28
Is a state in which the thick portion of the body 28b is positioned along the transport direction.

Then, in this state, the motor 86 of the rotating mechanism 56 is stopped, and after the rotation of the transport member 36 is stopped,
The slide plate 82 is retracted by the air cylinder 76, and the positioning member 102 and the preform positioning member 114 are moved.
Is released, the positioning of the preform 28 in the circumferential direction can be maintained.

In this state, if the conveying member 32 and the preform 28 are conveyed to the blow molding section by the conveying chain 32 and blow-molded, a good flat container or the like can be easily obtained.

In this case, the blow molding section 44
By using the blow cavity mold 48 having a cavity surface having a long axis arranged along the transport direction, it is possible to improve the moldability by enabling good air bleeding. Positioning can be easily performed using the stopper portion 28e.

Further, along the major axis of the blow cavity mold 48 along the transport direction,
By arranging a thick portion that has a small heat value and is difficult to expand, a sufficient thickness can be secured also at the long-axis end portion of the flat container.

The present invention is not limited to the above embodiment, but can be modified to various embodiments within the scope of the present invention.

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 has a large calorific value in a thick portion and a small calorific value for heating. In the case of a one-stage stretch blow molding apparatus of the type, if the thick part is arranged on the short axis side, sufficient stretching can be achieved, and two-stage stretching having a large heating calorie as in the present embodiment. In the case of the blow molding apparatus, since the thick portion has less heat than the thin portion, arranging the thick portion on the long axis side makes it difficult to expand, so that a sufficient thickness can be secured.

Further, in the present embodiment, the stopper portion protrudes from the neck portion. However, the stopper portion may be a concave hole. do it. In such a case, the advancing / retracting means of the positioning means is not limited to advancing / retreating which is orthogonal to the transport direction,
An air cylinder or the like may be added so as to advance and retreat in the transport direction.

Further, in the present embodiment, the stopper portion is provided on the neck portion. However, the stopper portion is not limited to the neck portion, and may be provided on the body portion or the like as long as there is no problem with the product. For example, in the case of a product having a support ring at the lower end of the neck portion, a stopper portion may be provided immediately below the support ring and outside the trunk portion where blow molding is small.

Further, the rotation mechanism in the present embodiment
Although the sprocket for rotation of the conveying member was used, the present invention is not limited to this. For example, the conveying member comes into contact with the conveying member from below,
It may be rotated by friction.

Further, in the above embodiment, eight preforms are injection-molded in the injection molding section, and four preforms are formed in the blow molding section.
Although the case where the preforms are blow-molded has been described, the number of injection moldings and the number of blow moldings can be changed as appropriate, and the standby portion can be arranged not only at the corner portion but also at the straight portion. .

When the preform positioning device is provided in the linear portion, it is not necessary to separately provide each positioning means and the like for the conveying member, and it is also possible to form them integrally.

[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.

FIG. 3 is a plan view of FIG. 1;

4 (A) to 4 (D) are enlarged plan views showing states of positioning of a conveying member positioning unit and a preform positioning unit.

FIG. 5 is a schematic plan view of an injection stretch blow molding device using the preform positioning device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stretch blow molding apparatus 16 Blow molding station 28 Preform 28e Stopper part 32 Conveying chain 36 Conveying member 42 Heating part 44 Blow molding part 50 Standby part 52 Preform positioning device 54 Advancing / retracting means 56 Rotary mechanism 58 Transport member positioning means 60 Preform positioning means 102 Positioning member 108 Spring 112 Guide 114 Preform positioning member 116 Spring 124 Claw

Claims (11)

[Claims] In a stretch blow molding apparatus for holding a preform by a transport member and transporting the preform to a blow molding section to perform blow molding, a peripheral portion of the preform is transported before the preform is transported to the blow molding section. A preform positioning device for positioning the preform in a direction, wherein the preform engages a stopper formed on an outer periphery of the preform in a circumferential direction with a rotation mechanism for rotating the preform via the transport member. And a preform positioning means for stopping rotation of the preform. 2. The preform positioning apparatus according to claim 1, wherein the stoppers of the preform are formed at two positions corresponding to 180 ° on the outer periphery of the preform. 3. The preform positioning device according to claim 1, wherein the preform positioning means positions the preform until rotation of the transport member stops. 4. The preform positioning means according to claim 1, wherein said preform positioning means engages with said preform by means of advance / retreat means, and separates from said preform after rotation of said transport member is stopped. A preform positioning device that is characterized. 5. The preform positioning means according to claim 1, wherein the preform positioning means urges the claw portion to be engaged with a stopper portion of the preform in a contact direction with the preform. A preform positioning device, comprising: 6. The preform according to claim 5, wherein the claw portion is allowed to contact the preform by allowing the rotation of the preform by a regulating member that regulates a contact position with respect to the preform. Preform positioning device. 7. A transport member positioning means according to claim 1, wherein said preform positioning means engages with said transport member when positioning said preform to position said transport member. A preform positioning device, characterized in that: 8. The transfer member positioning means according to claim 7, wherein the transfer member positioning means is adapted to follow the position of the transfer member by a biasing means, and the transfer member positioning means and the preform positioning means are provided integrally. A preform positioning device, comprising: 9. The transporting member according to claim 1, wherein the transporting member is transportable by a transporting chain, and the transporting chain is located on a side of the transporting chain opposite to the preform positioning means. A preform positioning device, characterized in that a guide for regulating the pressure is provided. 10. The stretch blow molding apparatus according to claim 1, wherein the stretch blow molding device has a heating unit that heats the preform before the blow molding of the preform by the blow molding unit. A preform positioning apparatus, comprising: a standby unit that waits for the preform between a unit and the heating unit; and performs circumferential positioning of the preform in the standby unit. 11. A preform positioning apparatus according to claim 1, wherein a plurality of said preform positioning means and a plurality of rotation mechanisms are provided in accordance with the number of preforms to be blow-molded at the same time. .