JP2001310374A - Preform positioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a preform positioning device for surely positioning a preform in a circumferential direction before a blowing cavity mold is clamped. SOLUTION: The preform positioning device positions the preform 28 in the circumferential direction in the case of clamping the blowing cavity mold 114 and blow molding in a state in which the preform 28 is held by a conveying member. The device comprises a preform positioning means 52 for positioning the preform 28 by engaging the member with a groove 28e of a flange 28c formed on an outer periphery of a neck 28a of the preform 28 before clamping the mold 114 and maintaining the engaging state at least until the mold clamping is completed at a blowing mold clamping unit.

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 circumferential direction in a stretch blow molding apparatus.

[0002]

BACKGROUND OF THE INVENTION In general,
When blow molding a bottomed cylindrical preform into a container,
The preform is heated to a temperature at which blow molding can be performed by a heating element such as an infrared lamp disposed outside the preform.

In such a heating apparatus, generally, a preform is rotated around its longitudinal axis, and the preform is uniformly heated in its circumferential direction.

On the other hand, when an elliptical or elliptical so-called flat container or the like having a major axis and a minor axis in cross section is blow-molded, a thick portion and a thin portion are preliminarily circumferentially formed on a preform. There is a heating method that provides different heat distributions in the circumferential direction even when the above-described heating device is used.

In this case, the thick portion of the preform must be disposed on the long axis side and blow-molded.

In the case of a spray container having a grip on the body, the neck is always positioned with respect to the blow cavity so that the spray trigger fixed to the neck and the grip on the body are always in the same position. Some must be oriented in the same direction.

In such a case, at the time of injection molding at the neck portion of the preform, a convex portion or the like is provided in advance, and before being conveyed to the blow molding position, the preform rotates by contacting the convex portion of the preform. There is a proposal that the preform is positioned in the circumferential direction by stopping the preform.

However, when the blow cavity mold is clamped to the preform conveyed to the blow molding position, a part of the preform or a conveying member of the preform comes into contact with the blow mold clamping part, and In some cases, the preforms positioned and arranged were slightly rotated and shifted.

[0009] Further, there is a problem such as damage due to contact with the preform.

SUMMARY OF THE INVENTION An object of the present invention is to provide a preform positioning apparatus for reliably positioning a preform in a circumferential direction before clamping a blow cavity mold.

[0011]

In order to achieve the above object, a preform positioning apparatus according to the present invention, when performing blow molding by clamping a blow cavity mold while holding a preform by a conveying member, A preform positioning device for positioning the preform in a circumferential direction, wherein the preform positioning device engages with a positioning portion formed on an outer periphery of a neck portion of the preform before clamping the blow cavity mold, and at least the mold clamping is completed. A preform positioning means for performing positioning while maintaining the engagement state is provided in the blow mold clamping portion.

According to the present invention, the preform positioning means is formed around the neck portion of the preform before the blow cavity mold is clamped in a state where the conveying member holding the preform is conveyed to the blow molding position. Since the mold is engaged with the positioning portion and the mold is clamped while maintaining the engaged state, blow molding can be performed without shifting the position of the preform before mold clamping.

Therefore, since the thick portion and the thin portion which are set in advance in the circumferential direction of the preform and the positioning portion which is formed in the neck portion of the preform are always in the same positional relationship, before the mold of the blow cavity mold is clamped. By performing positioning by engaging with the positioning portion of the neck portion, positioning in the circumferential direction of the preform is reliably performed, and a flat container having a desired thickness distribution can be formed. In the case of a spray container having a grip portion, the neck portion can be reliably positioned in the same position with respect to the grip portion of the body portion.

In the present invention, the blow mold clamping portion has a neck guide mechanism for holding the neck of the preform in conjunction with the blow cavity mold clamping operation when the blow cavity mold is clamped. The preform positioning means may be incorporated in the neck guide mechanism.

With such a configuration, before the neck guide mechanism holds the neck portion of the preform,
Since the preform positioning means positions the preform in the circumferential direction, it is possible to prevent the neck guide mechanism from contacting the preform or the conveying member and shifting the position of the preform.

According to the present invention, it is preferable that the preform positioning means is provided with a sensor for detecting whether or not the preform is positioned by the preform positioning means.

With this configuration, it is possible to judge whether the preform is positioned or not. If the sensor detects that the preform is not positioned, blow molding is performed. Or not
It is possible to issue a command to discharge the taken-out misaligned container out of the back line.

In the present invention, there is provided a blow molding section for performing blow molding using the blow cavity mold, and before the preform is conveyed to the blow molding section, positioning of the preform in the circumferential direction is performed. It is preferable to provide a preform preliminary positioning means for performing the preform.

With such a configuration, the preform is positioned by the preform prepositioning means in the circumferential direction of the preform before the preform is conveyed to the blow molding section, and then the preform is positioned by the preform positioning means by the preform positioning means. By performing the final positioning of the preform, more reliable positioning of the preform in the circumferential direction can be performed.

In the present invention, the preform preliminary positioning means comprises: a rotating mechanism for rotating the preform through the transport member; a detecting means for detecting a detected portion formed on the outer periphery of the preform; It is preferable that the apparatus further comprises control means for stopping the rotation mechanism for a predetermined time or after a predetermined rotation in response to the detection signal from the detection means.

With this configuration, while the preform is being rotated by the rotating mechanism via the conveying member, the detected portion formed on the outer periphery of the preform is detected by the detecting means, and the detection from the detecting means is performed. By stopping and controlling the rotation mechanism by the control means for a predetermined time or after a predetermined rotation in response to the signal, the circumferential positioning of the preform can be reliably performed.

In the present invention, it is preferable that the detecting means is capable of detecting the detected portion without contacting the preform.

With this configuration, the detected portion can be detected without contacting the preform, and the circumferential position of the preform can be determined without damaging the preform. it can.

Further, since the detecting means is not in contact, it is possible to easily cope with a change in the size or shape of the preform by merely adjusting the position of the detecting means.

In the present invention, the preform is:
The neck portion may have a flange portion projecting annularly, and the positioning portion and the detected portion may be grooves formed on an outer periphery of the flange portion.

With such a configuration, the groove formed on the outer periphery of the flange can be used as both the positioning part and the detected part, and the preform positioning means and the preform prepositioning means using the preform preliminary positioning means can be used. Circumferential positioning can be performed using a relatively simple preform shape.

Another preform positioning apparatus of the present invention is a preform positioning apparatus for positioning the preform in a circumferential direction before performing blow molding in a blow molding section while holding the preform by a conveying member. A rotating mechanism for rotating the preform through the conveying member, a detecting means for detecting a detected part formed on the outer periphery of the preform, and a predetermined time or receiving a detection signal from the detecting means. Control means for stopping and controlling the rotation mechanism after a predetermined rotation.

According to the present invention, before the conveying member holding the preform is conveyed to the blow molding section, the detecting section detects the detected section on the outer periphery of the preform which rotates by the rotating mechanism. When the rotation mechanism is stopped and controlled by the control means for a predetermined time or after a predetermined rotation in response to the signal from the controller, the circumferential positioning of the preform can be easily and reliably performed before blow molding.

[0029]

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

FIGS. 1 to 7 are views showing an injection stretch blow molding apparatus using a preform positioning apparatus according to one embodiment of the present invention.

FIG. 7 is a schematic plan view of the injection stretch blow molding apparatus.

The injection stretch blow molding apparatus 10 is roughly divided into a preform molding station 1 on a base 12.
4, 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 two injection core molds (not shown) at two positions separated by a rotation angle of 180 degrees. Two sets of the injection core mold and the neck cavity mold are formed along the rotary conveyance path. It has a turntable 20 that intermittently repeatedly rotates and conveys.

At a position where each set of the injection core mold and the neck cavity mold is stopped, an injection molding section 24 facing the injection device 22 and a take-out section 26 facing the injection molding section 24 are provided. ing.

On the other hand, in the take-out section 26, the preform 28
The preform 28 is released from the injection core mold by driving the neck cavity mold downward while holding the neck part, and then the neck cavity mold is opened,
The preform 28 is taken out.

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

The neck portion 28a has an annularly projecting flange portion 28c and a screw portion 28d.

Although not shown, the body portion 28b has a thick portion formed at a position corresponding to 180 °, and the outer periphery of the flange portion 28c is provided on the outer periphery of the flange portion 28c as shown in FIGS.
A positioning portion for positioning the preform 28 in the circumferential direction and a groove portion 28e as a detected portion are formed at two positions corresponding to 180 ° corresponding to the thick portion b.

The blow molding station 16 comprises four transport sprockets 30, a transport chain 32 bridged between 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.

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.

The heating unit 42 is provided with a heating device 43. The heating device 43 includes, for example, a plurality of infrared heaters extending along a transfer furnace arranged in the height direction of the preform. At this time, the sprocket 38 for rotation provided on the conveying member 36 (see FIGS. 1 and 3)
Meshes with a rotation chain (not shown) to
While rotating, the circumferential direction can be evenly heated.

The blow molding section 44 has a blow mold clamping section, and a blow mold clamping mechanism 45 is provided at the blow mold clamping section.
Blow cavity mold 1 for preform 28
14 is clamped, and, 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 part 24 of the preform molding station 14 to the receiving part 40 of the blow molding station 16.

At the take-out section 26 of the preform forming 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 intermittently transported.
Between the heating unit 42 and the blow molding unit 44, the heated preform 28
Is set as a standby unit 48 for alleviating the temperature difference between the inner and outer surfaces. Then, a preform positioning device is arranged in the standby section 48 and the blow molding section 44.

That is, the preform pre-positioning means 50 for positioning the preform 28 in the circumferential direction is provided in the standby portion 48, and the blow molding portion 44 is further provided for positioning the preform 28 in the circumferential direction. A preform positioning means 50 for performing is provided.

This preform preliminary positioning means 50
As shown in FIGS. 1 and 3, the advance / retreat means 54 and the rotation mechanism 56 are individually associated with the simultaneous blow molding number of, for example, four preforms 28 which are stopped and conveyed to the standby section 48. , A conveying member positioning means 58 and a detecting means 60 are provided 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 48.

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, 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 transport member 36 and a chain 90.

The motor 86 is mounted on the upper surface of the slide plate 82, and its output shaft 92 projects through the lower surface of the slide plate 82, and a gear 94 is 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 so that the sprocket 88 can rotate. Has been.

The chain 90 is mounted on the outer periphery of the sprocket 88, and the conveying 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 distal 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 the horizontal direction on a lower end portion protruding in an L-shape, and the front end portion is connected to the conveying member 36.
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.

As shown in FIGS. 2 and 4, the detecting means 60 is integrally provided on the positioning member 102 via the mounting member 112 bent at a predetermined angle, and faces the side surface of the flange portion 28c of the preform 28. It is arranged in a state.

In this embodiment, the detecting means 60 uses a coaxial reflection type optical displacement sensor, and detects the groove 28e of the flange 28c in a non-contact manner based on the difference in the amount of reflected light. I have.

In addition to such sensors, various detecting means such as a laser displacement sensor, a non-contact detecting means such as a displacement sensor in an ultrasonic wave sensor, and a contact type displacement sensor such as a dial gauge and a differential transformer. Can be adopted.

In particular, when the non-contact detecting means is used, the surface of the preform 28 is not damaged, so that a high quality product can be obtained.

After the preform 28 is rotated, the detecting means 60 detects the groove 28e formed in the flange 28c, and receives this detection signal. By stopping the rotation of the preform 28, as shown in FIG. 4 (B), the preform 28
To stop.

As a result, the preform 28 is
The position 8e is positioned in a direction orthogonal to the conveying direction of the preform 28, and as a result, the thick portion of the preform 28 is positioned at an optimum position during blow molding.

The preform positioning means 52 further positions the preform 28 in the circumferential direction when the preform 28 having been positioned in the circumferential direction by the preform preliminary positioning means 50 is conveyed to the blow molding section 44. As shown in FIGS. 5 and 6, a neck guide mechanism 118 attached to a pair of mold clamping plates 116 constituting a mold clamping portion for clamping the pair of blow cavity molds 114 is provided. I have.

Here, the blow mold clamping portion is a mold clamping plate and a blow cavity mold 11 attached to the mold clamping plate.
4, or including the neck guide mechanism 118,
The preform positioning means 52 may be provided in any of these.

FIG. 5 shows the mold open state on the right side and the mold clamped state on the left side, and FIG. 6 shows the neck guide 120 only on the right side in section for easy understanding of the operation description.

The neck guide mechanism 118 moves the neck portion 28 of the preform 28 in conjunction with the mold clamping operation of the blow cavity mold 114 when clamping the blow cavity mold 114.
a, the neck portion 28 of the preform 28
a pair of split-type neck guides 120 for holding a, and urging means 122 for urging the neck guides 120 in the opposite protruding direction.

The biasing means 122 is a blow cavity mold 1
A stopper rod 124 that contacts the neck guide 120 in the mold open state of 14 and prevents the movement of the neck guide 120.
And a coil spring 1 mounted on the stopper rod 124 to urge the neck guide 120 in the opposite protruding direction.
26.

As described above, since the neck guide 120 is urged in the opposite protruding direction by the coil spring 126 of the urging means 122, when the mold of the blow cavity mold 114 is clamped, the neck guide 120 is closed before the mold clamping is completed.
Holds the neck portion 28a of the preform 28 and reliably positions the preform 28, so that the preform 28 can be prevented from being damaged by contact due to misalignment between the preform 28 and the blow cavity mold 114. It has become.

The preform positioning means 52 is incorporated in the neck guide 120 of the neck guide mechanism 118.

The preform positioning means 52 includes a slide member 130 having a positioning pin 128 protruding from the tip thereof facing the side surface of the flange portion 28c, a disk-shaped forward stopper 132 attached to the rear of the slide member 130, and The guide rod 134 extending backward from the advance stopper 132 is inserted into a slide hole 136 formed at a substantially central position of the neck guide 120 in a direction perpendicular to the conveying direction of the preform 28. It is in a state of being left.

The slide hole 136 is formed in a slit shape on the front side so that the slide member 130 can be moved.
The upper part on the rear side is formed in a slit shape continuous with the slit on the front side, and further, the lower part is formed in a circular shape that allows the forward stopper 132 to move continuously with the slit on the upper part.

At the rear end of the circular portion of the slide hole 136, a screw plug 138 through which the guide rod 134 can be inserted is attached.
A coil spring 140 is mounted on the outer circumference of the guide rod 134 between the screw plug 138 and the screw plug 138.
The forward stopper 132 is formed by the coil spring 140.
, The positioning pin 128 is urged forward.

Further, the advance stopper 132 contacts the wall surface 142 at the boundary between the slit side and the circular side of the slide hole 136 to regulate the advance position.
As shown in the right side of FIG. 5 and FIG.
It is in a state protruding from the neck guide 120.

Therefore, before the neck guide 120 holds the neck portion 28a prior to the clamping of the blow cavity mold 114, the positioning pin 128 engages with the groove portion 28e formed in the flange portion 28c of the preform 28, After reliably performing the positioning of the reform 28 in the circumferential direction, the neck guide 120 holds the neck 28a,
After that, the mold clamping of the blow cavity mold 114 is performed.

This operation state will be described with reference to FIG.

First, as shown in FIG. 6A, when the blow cavity mold is opened, the neck guide 120 protrudes forward from the blow cavity mold 114, and the positioning pin 128 further moves the neck by the urging force of the coil spring 140. It is in a state protruding forward from the guide.

When the mold closing operation of the blow cavity mold 114 is started in this state, the blow cavity mold 114, the neck guide 120 and the positioning pins 128 approach the preform 28 side as shown in FIG. First, the positioning pins 128 are inserted into and engaged with the grooves 28e of the flanges 28c of the preform 28, whereby the preform 28 is positioned in the circumferential direction.

In this case, the positioning pin 128 is
Since the neck guide 120 is not in contact with the neck portion 28a in the state of being engaged with the e, the positioning of the preform 28 in the circumferential direction by the positioning pins 128 can be reliably performed.

Further, as in the case where the positioning pin 128 is fixed to the neck guide 120, the neck guide 120 engages with the neck portion 28a and crushes the screw portion 28d before the circumferential positioning of the preform. Can be prevented.

When positioning the preform 28 in the circumferential direction by the positioning pin 128, the tip of the positioning pin 128 takes a corner and is slightly tapered so that the preform 28 is slightly circumferentially positioned. Even when the sheet is conveyed with displacement, the circumferential position is corrected when the positioning pin 128 engages with the groove 28e.

Next, when the mold closing operation further proceeds from this state, the neck guide 120 engages with the neck portion 28a of the preform 28, as shown in FIG.
8a will be held.

When the mold closing operation further proceeds, the blow cavity mold 114 moves to the mold closing position as shown in FIG. 9D, and the mold is clamped in this state.

As shown in FIG. 5, a proximity sensor 144 is provided at the rear end of the screw plug 138 as a sensor for detecting whether or not the preform 28 has been positioned in the circumferential direction by the positioning pin 128. Is provided.

The proximity sensor 144 includes the positioning pin 1
When the groove 28 is not engaged with the groove 28e, the rear end of the guide rod 134 protrudes rearwardly than usual. By detecting the rear end position of the guide rod 134, the preform It is detected whether or not the positioning in the circumferential direction of 28 has been performed.

If the positioning of the preform 28 in the circumferential direction has been surely performed, blow molding is performed as it is.
It is possible to issue a command not to perform blow molding or to discharge the taken out misaligned container to the outside of the back line.

FIG. 8 is a view showing another embodiment of the preform positioning means.

The preform positioning means 52 is provided with a positioning plate 146 having a flat tip, instead of the positioning pin 128 in the above embodiment.

Then, the flange portion 2 of the preform 28
8c has a flat notch 14 instead of the groove 28e.
8 is formed, and the positioning plate 146 is brought into abutment engagement with the notch 148 so that the preform 28 is formed.
The width of correction for positioning in the circumferential direction can be made large.

The other configuration and operation are the same as those of the above embodiment, and the description is omitted.

The present invention is not limited to the above embodiment, but can be modified into various forms 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. In the case of a blow molding device, the thick portion can be sufficiently stretched by disposing the thick portion on the short axis side, and in the case of a stretch blow molding device of a type having a large amount of heat for heating, the thick portion is thin. When the thick portion is arranged on the long axis side, since the amount of heat is smaller than that of the above, it is difficult to extend, so that a sufficient thickness can be secured.

In this embodiment, the preform positioning portion and the detected portion in the preform pre-positioning device and the preform positioning device are formed as a common groove, but the positioning portion and the detected portion are separately provided. It is also possible.

In this case, the positioning portion and the detected portion are not limited to the grooves, but may be projecting.

The positioning of the preform by the preform preliminary positioning means is not limited to the case where a step such as unevenness of the preform is detected by a sensor. For example, the preform is injection-molded and held in a neck mold. In a state, or a state held in an injection core mold, or a state taken out of an injection mold, and taken out and held, a predetermined position of a preform is marked with a marking device such as an inkjet printer, and the mark is marked. Can be read by an optical sensor or the like.

Further, the preform pre-positioning means can be used alone without being combined with the preform positioning means.

[Brief description of the drawings]

FIG. 1 is an enlarged side view showing a preform prepositioning device in the injection stretch blow molding device of FIG.

FIG. 2 is an enlarged view of a main part of the preform prepositioning device of FIG. 1;

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

FIGS. 4A and 4B are enlarged plan views showing a state at the time of positioning of a conveying member positioning unit and a sensor.

FIG. 5 is an enlarged side view showing a preform positioning means of the present invention.

FIGS. 6A to 6D are schematic plan views showing a preform positioning state by preform positioning means.

FIG. 7 is a schematic plan view of an injection stretch blow molding device using the preform positioning device of the present invention.

FIG. 8 is a schematic plan view showing another embodiment of the preform positioning means of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stretch blow molding apparatus 16 Blow molding station 28 Preform 28a Neck part 28c Flange part 28e Stopper part 44 Blow molding part 50 Preform preliminary positioning means 52 Preform positioning apparatus 60 Detecting means 86 Motor 114 Blow cavity mold 116 Mold clamping plate 118 Neck guide mechanism 120 Neck guide 128 Positioning pin 130 Slide member 132 Advance stopper 134 Guide rod 136 Slide hole 138 Screw plug 140 Coil spring 144 Proximity sensor 146 Positioning plate 148 Notch

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasushi Taniguchi 4586-3 Koka, Komoro-shi, Nagano F-term in Nissei ASB Machinery Co., Ltd. (reference) 4F202 AG07 AG24 AP06 CA15 CB01 CK25 CK90 4F208 AG07 AG24 AP06 LD03 LD06 LD16 LG16 LG19 LJ21 LJ29

Claims (8)

[Claims] 1. A preform positioning device for positioning a preform in a circumferential direction when performing blow molding by clamping a blow cavity mold while holding a preform by a conveying member, wherein The blow mold clamping unit includes a preform positioning unit that engages with a positioning unit formed around the neck of the preform before the mold clamping of the cavity mold and performs positioning while maintaining the engaged state at least until the completion of the mold clamping. A preform positioning device, characterized in that it is provided in a preform. 2. The neck guide mechanism according to claim 1, wherein the blow mold clamping portion holds a neck portion of the preform in conjunction with a mold clamping operation of the blow cavity mold when clamping the blow cavity mold. A preform positioning device, wherein the preform positioning means is incorporated in the neck guide mechanism. 3. The preform positioning means according to claim 1, wherein the preform positioning means is provided with a sensor for detecting whether or not the preform is positioned by the preform positioning means. Preform positioning device. 4. The blow molding apparatus according to claim 1, further comprising: a blow molding section configured to perform blow molding using the blow cavity mold, wherein the preform is transported to the blow molding section. A preform positioning device comprising preform preliminary positioning means for positioning a reform in a circumferential direction. 5. The preform pre-positioning means according to claim 4, wherein the preform pre-positioning means comprises: a rotating mechanism for rotating the preform via the transport member; and a detecting means for detecting a detected portion formed on the outer periphery of the preform. And a control means for stopping and controlling the rotation mechanism for a predetermined time or after a predetermined rotation in response to a detection signal from the detection means. 6. The preform positioning apparatus according to claim 5, wherein said detection means is capable of detecting said detected portion without contacting said preform. 7. The preform according to claim 5, wherein the preform has a flange portion annularly protruding from the neck portion, and the positioning portion and the detected portion are grooves formed on an outer periphery of the flange portion. A preform positioning device, characterized in that: 8. A preform positioning device for positioning the preform in a circumferential direction before performing blow molding in a blow molding section while holding the preform by a transport member, wherein the preform is positioned via the transport member. A rotation mechanism that rotates the preform, a detection unit that detects a detection target formed on the outer periphery of the preform, and a stop control that stops the rotation mechanism for a predetermined time or after a predetermined rotation in response to a detection signal from the detection unit A preform positioning device, comprising: