JP2002337216A - Injection stretch blow molding machine and injection stretch blow molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection stretch blow molding machine simplified in structure and capable of enhancing reliability, a speed, maintenance properties or the like. SOLUTION: An injection molding station 12, a first delivery part 14, a cooling station 16, a second delivery part 18, a heating station 20, a third delivery part 22 and a blow molding station 24 are arranged along a feed direction A. More than one rows, each of which comprises a plurality of preforms, of preforms are injection-molded at the same time and the pitch between the preforms in the second direction B of each of the rows is converted to a pitch at the time of blow molding in the first delivery part 14 and the preforms are subsequently fed through the cooling station 16, the second delivery part 18, the heating station 20, the third delivery part 22 and the blow molding station 24 while holding the blow molding pitch to be subjected to blow molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection stretch blow molding apparatus and an injection stretch blow molding method, and more particularly to an injection stretch blow molding apparatus for injection molding a preform, controlling the temperature, and then blow molding to form a container. And an injection stretch blow molding method.

[0002]

BACKGROUND OF THE INVENTION As an injection stretch blow molding apparatus, the present applicant has previously described WO 98/0.
9793 was proposed.

[0003] This injection stretch blow molding apparatus has an injection molding station, a cooling station, a heating station, and a blow molding station arranged in one direction, and has a first transfer section between the injection molding station and the cooling station. A second delivery section is provided between the cooling station and the heating station, and a third delivery section is provided between the heating station and the blow molding station. In addition to eliminating waste of transfer space, the molding efficiency is improved, and the installation area of the apparatus is minimized to save space.

In this injection stretch blow molding apparatus, the pitch between rows of preforms formed by injection molding in a plurality of rows in a first transfer section is converted, and the pitch of preforms in each row is converted to a heating station in a second transfer section. The pitch is converted to the adjusted pitch, and further, the pitch of the preform in each row at the time of heating is converted into the pitch at the time of blow molding in the third delivery section, and the structure of the first to third delivery sections is complicated. Thus, further improvement was desired.

An object of the present invention is to provide an injection stretch blow molding apparatus and an injection stretch blow molding method capable of simplifying the structure and improving reliability, speed, maintainability, and the like.

[0006]

In order to achieve the above object, an injection stretch blow molding apparatus according to the present invention comprises an injection molding station for injection molding a preform, and a preform injection molded at the injection molding station. A first delivery unit for delivering, a cooling station for conveying and cooling the preform delivered from the first delivery unit in a first direction, and delivering the preform cooled by the cooling station A second delivery unit, a heating station that conveys and heats the preform delivered from the second delivery unit in the first direction, and delivers the preform heated by the heating station. A third delivery section, and a preform delivered from the third delivery section is conveyed and stretch blow-molded to form a container. And a low molding station,
The injection molding station has an injection mold for simultaneously injection molding a plurality of the preforms in an upright state in parallel to a second direction orthogonal to the first direction, and the first transfer unit includes: An ejection mechanism for receiving the plurality of preforms simultaneously injection-molded from an injection molding station in an upright state, and taking out the pitch between the preforms in the second direction to the outside of the injection molding station, and an ejection mechanism; And a delivery mechanism that takes out the plurality of preforms from the same at the same time, converts the pitch between the preforms in the second direction into a pitch at the time of blow molding in the blow molding station, and delivers the pitch to the cooling station in an upright state. Having the cooling station blow molding the pitch between the preforms in the second direction A first conveyance path for intermittent conveyance in an erect state while being held at the pitch in the second transfer section, wherein the second transfer section reverses the preform in the erect state cooled in the cooling station to the heating station. The heating station has a reversing mechanism for transferring in an inverted state, and the heating station has a second conveyance path for intermittently conveying the preform in the second direction in an inverted state while maintaining the pitch between the preforms at the pitch at the time of blow molding. , The third delivery unit,
A transfer mechanism for transferring the preform heated by the heating station to the blow molding station in an inverted state, wherein the blow molding station includes a third rectangular transport path, and a third rectangular transport path. A receiving section provided on one side and receiving the preform delivered from the third delivery section in an inverted state; and a receiving section provided on one side of the third transport path adjacent to the receiving section and receiving the preform. And a take-out unit that is disposed on one side of the third transport path facing the receiving unit and takes out a container formed by the blow molding unit. It is characterized by having.

According to the present invention, the preform injection-molded at the injection molding station is taken out in the arrangement at the time of injection molding by the take-out device of the first delivery section, and the delivery mechanism interposes the preform between the preforms in the second direction. The pitch is converted to the pitch at the time of blow molding, then the cooling station,
Since the heating station and the blow molding station are each transported while maintaining the pitch at the time of blow molding, there is no need to change the pitch between the preforms in the second direction at the second delivery section and the third delivery section, The structure of the second delivery unit and the third delivery unit can be simplified, and the reliability, speed, maintainability, and the like can be improved.

In the present invention, at the injection molding station, the injection molding die injection-molds a plurality of rows of preforms parallel to the second direction, and at the cooling station, the first transport path is formed by injection molding. The preform is conveyed while maintaining the inter-row pitch of the preform at the time, and in the heating station, the second conveying path moves the preform at a narrower inter-row pitch than the interform pitch of the preform during injection molding. In the second transfer section, the reversing mechanism can transfer the preforms of each row on the first transfer path to the second transfer path.

With such a configuration, in the second transfer section, the reversing mechanism transfers the preforms of each row on the first transport path to the second transport path, so that the heating station is less than the cooling station. Even when the pitch between rows is narrow, it is possible to perform delivery corresponding to the pitch between rows without complicating the structure.

In this case, a first transport mechanism is provided in the first transport path in the cooling station, and the first transport mechanism is wound around a plurality of sprockets on both sides of the first transport path and is driven by driving means. A pair of drive chains that are made intermittently rotatable in the vertical direction, and a plurality of transport plates that are held across the pair of drive chains at intervals corresponding to the pitch between rows of the preform during injection molding. Have
Each of the transport plates is provided in a plurality of preform through-holes formed at intervals corresponding to the pitch of the preform during blow molding, and is provided in each of the preform through-holes, and the body of the preform is inserted. And a support member for supporting a flange portion formed on the neck portion of the preform in this state.

With such a configuration, a large number of preforms can be held, transported and cooled at a cooling station with a simple structure.

In this case, the transport plate is provided with the second
The preform can be stopped at a position where the preform is tilted and held on the delivery part side, and the reversing mechanism in the second delivery part is
A plurality of gripping members for gripping a plurality of the preforms,
A drawing cylinder for moving the holding member holding the preform in the inclined state in the direction of drawing the preform, and rotating the holding member from which the preform is drawn by the drawing cylinder to invert the preform to an inverted state. And a lifting cylinder that lowers the gripping member that grips the preform in an inverted state so that the preform can be transferred to the second transport path.

With such a configuration, the reversing angle of the reversing mechanism in the second transfer section can be reduced, the installation space can be reduced to save space, and the transfer can be speedy.

According to the injection stretch blow molding method of the present invention, there is provided an injection molding step in which a preform is injection-molded in an upright state at an injection molding station; A take-out step of taking out the preform in a first direction, a first delivery step of delivering the taken-out preform in an upright state, and transporting the delivered preform in an upright state in a first direction; And a cooling step of cooling, a second delivery step of inverting the cooled preform and delivering the inverted preform in an inverted state, and the first preform delivered in the second delivery step in an inverted state. A heating step of conveying and heating the preform in a direction, a third delivery step of delivering the heated preform in an inverted state, and a preform delivered in the third delivery step. And a blow molding step of forming the container by carrying out stretch blow molding to form a container. In the injection molding step, a plurality of preforms parallel to a second direction orthogonal to the first direction are provided. Are simultaneously injection-molded, and in the take-out step, the preform is taken out while keeping the pitch between the preforms in each row and the pitch between the rows in the injection-molded step. In the first delivery step, the preform is taken out. The pitch between the preforms in each row is converted to the pitch at the time of blow molding while the pitch between each row of the reforms is kept as it is, and in the cooling step, the pitch between the preforms in each row is the pitch at the time of blow molding. In the second delivery step, the pitch between the cooled preforms in each row is held at the pitch at the time of blow molding and delivered, and the heating step is performed. Is intermittently transported while maintaining the pitch between the preforms in each row at the pitch at the time of blow molding. In the third delivery step, the pitch of the heated preforms in each row is maintained at the pitch at the time of blow molding. It is characterized by being delivered as it is.

According to the present invention, the pitch between the preforms in each row of each injection-molded preform is converted into the pitch at the time of blow molding in the first delivery step, and thereafter, the cooling step, the heating step, the blow molding step By transporting while maintaining the pitch, the structure can be simplified, and the reliability, speed, and maintainability can be improved.

[0016]

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

FIGS. 1 to 6 are views showing an injection stretch blow molding apparatus according to one embodiment of the present invention.

FIG. 1 is a schematic plan view of an injection stretch blow molding apparatus according to the present embodiment, and FIG. 2 is a side view thereof.

In FIG. 1, a part of the injection device is omitted, and an upper clamping plate and a part of an injection molding die attached to the upper clamping plate in the injection molding station.
In FIG. 2, the upper half of the delivery mechanism and the upper half of the third delivery unit are omitted. In FIG. 2, the front side of each station is partially omitted, and a part of the injection device and the blow molding station are omitted. are doing.

The injection stretch blow molding apparatus 10 includes an injection molding station 12, a first delivery section 14, a cooling station 16, a second delivery section 18, a heating station 20, a third delivery section 22, The molding station 24 and the molding station 24 are linearly arranged along the transport direction A of the preform 26 which is the first direction.

The injection molding station 12 includes the injection device 2
8 and a plurality of, for example, eight rows of preforms 26 arranged in a second direction B orthogonal to the transport direction A of the preforms 26. For example, four rows are injection-molded simultaneously.

The injection molding apparatus 30 can be moved up and down through four tie bars 36 by a lower clamping plate 34 fixed to a machine base 32 and a clamping cylinder (not shown). It has an upper clamping plate 38 and an injection mold device 40 provided between the lower clamping plate 34 and the upper clamping plate 38.

An injection mold apparatus 40 is provided with an injection cavity mold 42 having 32 cavities for simultaneously forming eight rows of preforms 26 in four rows via a hot runner 44 connected to the injection apparatus 28. It is attached to the lower clamping plate 34 on the fixed side.

A neck cavity mold and an injection core mold (not shown) are clamped to the injection cavity mold 42 to perform injection molding.

Accordingly, in this injection molding step, four rows of eight preforms 26 are injection-molded simultaneously in an upright state.

Then, after cooling for a predetermined time, the upper mold clamping plate 38 is raised to release the preform 26 from the injection cavity mold 42, and the neck cavity mold is lowered to set the injection core mold on the preform 26. After the mold release, the preform 26 is opened by opening the neck cavity mold.
Is released from the neck cavity mold and dropped and taken out.

The first transfer unit 14 transfers the preform 26 injection-molded at the injection molding station 12 to the cooling station 16 and has a take-out mechanism 46 and a transfer mechanism 48.

The ejection mechanism 46 is provided at the injection molding station 1
The four rows of preforms 26 that are injection molded simultaneously from 2 are received in an upright state, and the pitch between the preforms 26 in each row and the pitch between each row are taken out of the injection molding station 12 as they are, It has a take-out plate 50, a take-out rail 52, and a take-out rail support plate 54.

The ejection plate 50 is connected to the injection molding station 12.
Are formed by one plate having 32 cylindrical mounting members 56 capable of accommodating a part of the preform 26 at intervals corresponding to the intervals between the four rows of preforms 26.

Each mounting member 56 is at least high enough to enter the injection molding station 12 without interfering with the preform 26 when the mold is opened, and can accommodate a part of the preform 26 by descending the neck cavity mold. About the neck portion of the preform 26 so that the delivery mechanism 48 can easily and reliably hold the vicinity of the neck portion of the preform 26 when retracted from the injection molding station 12. 26 is configured to be supported by the bottom portion and at least a part of the body portion so as not to tilt or change the position of the neck portion.

The take-out rail 52 is provided with the injection cavity mold 4
2 and between the tie bar 36 and extends from the injection molding station 12 to the first transfer section 14.

In FIG. 2, two tie bars 36 on the near side are omitted.

The take-out rail support plate 54 is provided with a tie bar 36.
It is fixedly arranged on the lower clamping plate 34 between them.

By driving a motor 58 attached to the take-out rail support plate 54, the take-out rail 52
By rotating a ball screw (not shown) disposed along the take-out rail 50, the take-out plate 50 can advance and retreat along the take-out rail 52 with respect to the injection molding station 12.

The delivery mechanism 48 simultaneously takes out the 32 preforms 26 from the take-out mechanism 46, and keeps the pitch between the rows in the transport direction A as it is.
6 is converted into a pitch at the time of blow molding in the blow molding station 24 and transferred to the cooling station 16 in an upright state. The elevating mechanism 66, the reciprocating cylinder 64, the holding member 60, the pitch converting mechanism 62.

The transfer mechanism 48 is supported by a transfer mechanism support 68 provided on both sides of the cooling station 16 on the side of the injection molding station 12.

The lifting mechanism 66 includes a lifting servomotor 61.
Is transmitted to the pulleys 65 on both sides of the transfer mechanism support base 68 by the belt 63, and the ball screw mechanism 6 extending in the vertical direction
7 is driven.

The ball screw mechanism 67 includes a vertically movable frame 69.
Is attached, and can be moved up and down along a linear guide (not shown) provided along the transfer mechanism support base 68.

The reciprocating cylinder 64 is mounted on a vertically movable frame 69, and the tip of a cylinder rod 74 is mounted on a slide base 76 slidably supported on the injection molding station 12 side with respect to the transfer mechanism support base 68.
The slide base 76 can be moved to a position where the take-out plate 50 is taken out and a position where the slide table 76 is delivered to the cooling station 16.

The holding member 60 has a main frame 70 mounted on a slide base 76.
Base plates 72 slidably mounted on
Are provided at intervals corresponding to the pitch between columns at the time of injection molding.

The holding member 60 is connected to an opening / closing rod 71 for each base plate 72, and is opened and closed by an opening / closing cylinder (not shown) so that the neck portion of the preform 26 can be gripped and released.

The pitch conversion mechanism 62 includes a base plate 7
2 with respect to the main frame 70, the interval between the base plates 72 is adjusted to the pitch between the preforms 26 during the injection molding and the preform 26 during the blow molding.
The pitch can be converted between.

For example, although not shown, four base plates 72 are connected by positioning rods and closed by a pitch conversion cylinder, so that the pitch between the preforms 26 during injection molding is reduced. Is set to the open state, the four base plates 7
The pitch between the preforms 26 at the time of blow molding can be set every two.

When the pitch is converted into the pitch at the time of blow molding, a predetermined space can be set between the two central base plates 72 in accordance with the state of the transport path of the cooling station 16.

In the take-out process in the first transfer section 14, the take-out plate 50 is driven by the motor 58 with the mold of the injection mold device 40 being opened so that the take-out plate 50 is moved as shown by the arrow C in FIG. When the neck cavity mold is lowered and opened in this state, the released preform 26 is dropped and held in the mounting member 56, and in this state, the preform 26 is moved to the take-out position as shown by the arrow C in FIG. It retreats and is taken out by the delivery mechanism 48.

After the preform 26 is taken out by the delivery mechanism 48, as shown by the arrow D in the figure, two mounting members 56 are moved toward the injection molding station 12 and cooled by the delivery mechanism 48. The delivery to the station 16 is not obstructed.

Next, in the first delivery step by the delivery mechanism 48, the holding member 60 is in a standby state at the standby position shown in FIG. 2, and in this state, the interval between the base plates 72 is set at the time of injection molding. Preform 26 for each row
The spacing is in accordance with the pitch between them, and each holding member 60 is open.

In this state, when the take-out plate 50 moves to the take-out position shown in FIG. 2, the holding member 60 is lowered by the elevating mechanism 66 to the take-out position. At this position, the holding member 60 is closed and the preform 26 is closed. Holding the neck of
In this state, the elevating mechanism 66 raises the holding member 60 to take out the preform 26 in an upright state.

After the take-out, the pitch conversion mechanism 62 slides the base plate 72 so that the interval between the preforms 26 at the time of take-out is the same as the pitch between the rows, and the interval between the preforms 26 at each row is the pitch at the time of blow molding. To expand to.

Next, the reciprocating cylinder 64 is moved to the slide table 7.
6 is moved to the cooling station 16 side, and the holding member 60 is moved.
Is located above the transfer position to the cooling station 16.

In this state, the lifting mechanism 66 moves the holding member 60
Is lowered to the delivery position, and when the holding member 60 is opened at that position, the preforms 26 are delivered at once by the number of simultaneous injection molding.

In this state, the holding member 60 is raised by the elevating mechanism 66, the holding member 60 is moved to the retracted position by the reciprocating cylinder 64, and the pitch of the holding member 60 is reduced by the pitch conversion mechanism 62 during injection molding. By returning to the interval of the reform 26, a standby state is set.

The cooling station 16 includes the first transfer section 1
4. The preform 26 delivered from 4 is transported in the transport direction A and cooled, and the pitch between the preforms 26 in the second direction B is intermittently maintained in the erect state while maintaining the pitch at the time of blow molding. First transport path 78 for transport
have.

A first transport mechanism 80 is provided in the first transport path 78. The first transport mechanism 80 has a pair of drive chains 82 and a plurality of transport plates 84, as shown in FIG. are doing.

Each drive chain 82 is wound around a plurality of, for example, four sprockets 86 on both sides of the first transport path 78, and can be intermittently driven in the vertical direction by a motor 88 as a driving means.

Each transport plate 84 is held between a pair of drive chains 82 at intervals corresponding to the pitch between rows of the preform 26 during injection molding.

Each transport plate 84 has a plurality of, for example, eight preform through-holes 90 formed in the second direction B at intervals corresponding to the pitch of the preform 26 during blow molding. Each of these preform through holes 90
The support member 92 is attached to the second member.

The support member 92 has a short cylindrical shape that supports a flange formed on the neck of the preform 26 with the body of the preform 26 inserted.

In the cooling step at the cooling station 16, the 32 erecting preforms 2 transferred at the transfer position by the first transfer unit 14 are transferred.
6 is intermittently transported and cooled while maintaining the pitch between the preforms 26 in each row at the pitch in the blow molding while keeping the pitch of the preforms 26 between the rows during injection molding.

As described above, the first transport mechanism 80 has a simple structure of the drive chain 82 and the transport plate 84,
Reliability and maintainability can be improved.

As shown in FIG. 2, the transport plate 84 is stopped in an inclined state at a position corresponding to each sprocket 86. At the end on the second transfer portion 18 side,
The preform 26 is stopped in a state where the neck portion is inclined toward the second delivery portion 18 side.

The second transfer unit 18 is provided for the cooling station 1
It has two reversing mechanisms 94 arranged side by side to reverse the preform 26 in the upright state cooled in 6 and transfer it to the heating station 20 in an inverted state.

Each reversing mechanism 94 has a reversing frame 98 rotatably mounted on a fixed base 96 erected on the machine base 32, and a rotary actuator 100 mounted on the fixed base 96.
To rotate the reversing frame 98.

As shown in FIGS. 4 to 6, the reversing frame 98 has a gripping member 102 and a drawing cylinder 104.
And an elevating cylinder 106 are provided.

The gripping members 102 are in a state in which two sets of four pairs are provided on a gripping base 108 slidably mounted on the rotating frame 98.

Each pair of gripping members 102 is alternately fixed to two slide rods 110, and two opening / closing cylinders 112 are connected to the gripping members 102 connected to different slide rods 110.
It can be opened and closed by the drive of.

The drawing cylinder 104 and the elevating cylinder 106 are connected to each other, and the cylinder rod 114 of the drawing cylinder 104 is
08, the cylinder rod 116 of the lifting cylinder 106 is connected to the rotating frame 98.

In the second delivery step in the second delivery section 18, as shown in FIG.
Comes to the end position of the first transport path 78, the transport plate 84 stops at the position corresponding to the sprocket 86 in an inclined state, and the preform 26 is held in an inclined state with the neck protruding toward the reversing mechanism 94. Becomes

In this state, the reversing mechanism 94 moves the gripping member 1
02 is in a standby state, and after the transport plate 84 moves to and stops at the inclined delivery position, the gripping member 102 is closed to grip the neck of the preform 26.

Next, the gripping member 102 is moved in the drawing direction by the drawing cylinder 104, and the preform 26 is drawn obliquely upward.

Next, as shown in FIG. 6, the rotary actuator 100 is rotated, and the preform 26 is turned over to be in an inverted state.

In this state, the preform 26 is located above the conveying member of the heating station 20 and is in a state immediately before delivery.

From this state, the gripping member 102 is lowered by the lifting cylinder 106 and the gripping member 102 is opened, whereby 1
The preforms 26 in eight rows are inverted from the upright state and delivered to the heating station 20 in the inverted state.

After the delivery is completed, the gripping member 102 is opened, the gripping base 108 is raised by the pull-out cylinder 104 to a position where it does not interfere with the preform 26, rotated by the rotary actuator 100, and lowered obliquely by the lifting cylinder 106. It waits for the next transport plate 84 to arrive.

As described above, when the reversing mechanism 94 receives the preform 26 in an inclined state and reverses the preform 26, the rotation range of the reversing mechanism 94 is narrowed, and the installation space for the reversing mechanism can be reduced. Since the rotation angle is small, delivery can be achieved in a short time.

The heating station 20 heats the preform 26 cooled by the cooling station 16, and two heating stations 20 are provided in parallel.

Each heating station 20 is connected to the second transport path 1
18 and a heating box 120.

In the heating box 120, heaters 122 are provided between the two preforms 26 in the second direction B toward the preforms on both sides, respectively. Has a heat insulating plate 124 disposed therein.

The second transport path 118 is provided with a plurality of transport members 126 for supporting the preform 26 delivered from the second delivery section 18 in an inverted state, and the transport members 126 for transporting the plurality of transport members 126 in the transport direction A of the preform 26. Along the third delivery unit 2
And a second transport mechanism 128 that intermittently transports up to two.

The transport members 126 are rotatably mounted on the bracket 130 in pairs,
Are arranged at predetermined intervals along the transport direction A, and there are four rows of the brackets 130 in the second direction.

The pitch of the transport member 126 in the transport direction A is set to be narrower than the transport pitch in the cooling station 16, and the preform 2 in the second direction is
The pitch between 6 is set to the pitch at the time of blow molding.

Each transport member 126 projects the preform support portion 132 from the upper surface.
The preform 26 can be supported in an inverted state by inserting the neck portion of the preform 26 into 32.

At the lower end of each transport member 126, a rotation sprocket 134 forming a rotation mechanism is attached.

By rotating a rotation chain (not shown) with the rotation sprocket 134, uniform heating is performed while rotating the preform 26.

The second transport mechanism 128 is connected to the transport chain 13
6 and a transfer actuator 138.

The transport chain 136 is
The brackets are connected to and fixed to the transport chain 136.

The transfer chain 136 meshes with a plurality of sprockets 140 and the transfer actuator 13
By the drive of No. 8, intermittent rotation is enabled in the vertical direction via the sprocket 140.

Then, in the heating step in the heating station 20, the 8
Pieces of the preform 26 in the inverted state are two second transport paths 1
While being intermittently conveyed in the second direction B while maintaining the pitch at the time of blow molding in the second direction B, while being rotated by a rotation mechanism (not shown), it passes through the heating box 120 and is heated to an appropriate temperature for blow molding. It will be conveyed to the delivery part 22.

In this case, since the delivery mechanism of the preform 26 is very compact as before, in the heating step, the transport pitch between the rows in the cooling station 16 is narrower than the transport pitch between the rows. As the path becomes shorter, the heater becomes shorter, so that space saving and cost saving can be achieved.

The third delivery unit 22 is provided at the heating station 2
Preform 2 from 0 to blow molding station 24
6 and two are arranged side by side.

Each third transfer section 22 has a transfer mechanism 142 for transferring the four preforms 26 heated in each heating station 20 to the blow molding station 24 in an inverted state.

Each transfer mechanism 142 includes a holding member 144 for holding the neck of the preform 26 and a holding member 144.
And a moving mechanism 148 for moving the gripping member 144 from a gripping position on each heating station 20 side to a receiving position on the blow molding station 24 side.

In the third delivery step in the third delivery section 22, the four preforms 26 transported to the end of the heating station 20 are moved by the lifting mechanism 146.
The gripping member 144 is moved down, the gripping member 144 is closed, and the neck of the preform 26 is gripped.

Next, the elevating mechanism 146 is raised to move the preform 2 from the conveying member 126 of the heating station 20.
6, the gripping member 144 is conveyed onto the blow molding station 24 by the moving mechanism 148.

Then, the holding member 1 is moved by the elevating mechanism 146.
By lowering the holding member 144 and opening the gripping member 144, the blow molding station
4 can be forwarded.

The blow molding stations 24 are arranged side by side so that every four preforms 26 heated by being divided into two by the heating station 20 can be blow molded simultaneously.

Each of the blow molding stations 24 includes a third conveying path 150, a receiving section 152, and a blow molding section 154.
And an extraction unit 156.

The third transport path 150 is substantially rectangular and one side of which is arranged to face the third transfer section 22. The third transport path 150 includes a transport member 158 and a third transport mechanism 160.

The transport member 158 is for supporting and transporting the preform 26 one by one in an inverted state, and has a preform supporting portion (not shown) protruding upward.

The third transport mechanism 160 includes a plurality of transport members 1
The transport chain 164 is intermittently transported, and the transport chain 164 is laid over four sprockets 162 arranged at the corners of the transport path of the third transport path 150 and arranged in a rectangular shape.

An intermittent transport motor (not shown) is connected to one of the four sprockets 162 so that the four transport members 158 connected to the transport chain 164 are transported intermittently.

The receiving section 152 is connected to the third transport path 150
The third delivery unit 2 is disposed on the delivery unit 22 side and receives four preforms 26 from the third delivery unit 22.
The four transport members 158 are intermittently stopped at positions corresponding to the gripping members 144 in FIG.

The blow molding section 154 is connected to the third conveying path 150
This is provided on one side of the downstream side in the conveyance direction of the preform 26 and stretch-blow-molds the preform 26 received by the receiving section 152 to form a container.
A stretch blow molding apparatus 166 for simultaneously performing stretch blow molding on the preforms 26 is provided.

The take-out section 156 is provided on one side facing the receiving section 152 and takes out the container formed by the stretch blow molding device 166 of the blow forming section 154. The four pieces taken out to the position of the take-out section 156 are taken out. An unloading device 168 for unloading the container is disposed to face the third transport path 150 at the unloading position.

The blow molding station 24
In the blow molding process in the above, every four preforms 26 received by the receiving unit 152 are intermittently transported along the third transport path 150, and the blow molding unit 154 forms a container. I try to take it out.

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, in the above-described embodiment, eight preforms in one row are injection-molded in four rows at the same time, and simultaneous blow molding is performed for each of eight preforms. The number of moldings can be set arbitrarily.

In the above-described embodiment, two heating stations, three third transfer units, and two blow molding stations are provided. However, the present invention is not limited to this example, and it is also possible to provide one each. .

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an injection stretch blow molding apparatus according to one embodiment of the present invention.

FIG. 2 is a side view excluding the blow molding station of FIG. 1;

FIG. 3 is a front view of a cooling station.

FIG. 4 is a front view of the reversing mechanism.

FIG. 5 is a side view showing a state where the preform is pulled out by the reversing mechanism.

FIG. 6 is a side view showing a state where the reversing mechanism is reversed from the state of FIG. 5 and transferred to the heating station.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Injection stretch blow molding apparatus 12 Injection molding station 14 1st delivery part 16 Cooling station 18 2nd delivery part 20 Heating station 22 3rd delivery part 24 Blow molding station 26 Preform 46 Take-out mechanism 48 Delivery mechanism 78 1st conveyance way 80 First transport mechanism 82 Drive chain 84 Transport plate 90 Preform through hole 92 Support member 94 Inverting mechanism 100 Rotary actuator 102 Gripping member 104 Extraction cylinder 106 Elevating cylinder 118 Second transport path 120 Heating box 128 Second transport mechanism 142 Transfer mechanism 150 Third transport path 154 Blow molding section 160 Third transport mechanism

Claims (5)

[Claims] 1. An injection molding station for injection molding a preform, a first delivery unit for delivering the preform injection-molded in the injection molding station, and the preform delivered from the first delivery unit A cooling station that conveys the preform in a first direction and cools the preform, a second delivery unit that delivers the preform cooled by the cooling station, and a preform that is delivered from the second delivery unit. A heating station for conveying and heating the preform in the first direction, a third delivery unit for delivering the preform heated in the heating station, and a delivery unit for delivering the preform delivered from the third delivery unit. And a blow molding station for forming a container by stretch blow molding, wherein the injection molding station comprises: An injection molding die for simultaneously injection molding a plurality of the preforms in an upright state in parallel to a second direction orthogonal to a direction, wherein the first delivery unit comprises a plurality of injection molded molds simultaneously injected from the injection molding station. Receiving the preform in an upright state, and taking out the preform in the second direction as it is, to the outside of the injection molding station, and taking out the plurality of preforms simultaneously from the takeout mechanism; A transfer mechanism that converts a pitch between the preforms in the second direction into a pitch at the time of blow molding in the blow molding station and transfers the pitch to the cooling station in an upright state; Upright while maintaining the pitch between preforms in the direction of 2 at the pitch during blow molding A first transfer path for intermittently transferring the preform in an upright state, wherein the second transfer section reverses the upright preform cooled in the cooling station and transfers the preform to the heating station in an inverted state. The heating station has a second conveyance path that intermittently conveys the preform in the second direction in an upside down state while maintaining the pitch between the preforms at the pitch at the time of blow molding. A transfer mechanism for transferring the preform heated by the heating station to the blow molding station in an inverted state, wherein the blow molding station has a substantially rectangular third transport path; A receiving portion provided on one side and receiving the preform delivered from the third delivery portion in an inverted state, and a receiving portion adjacent to the receiving portion of the third transport path. A blow molding unit disposed on one side for simultaneously stretch blow molding the number of the preforms received by the receiving unit; and a blow molding unit disposed on one side of the third transport path facing the receiving unit. And a take-out part for taking out the container formed by the injection stretching blow molding apparatus. 2. The injection molding station according to claim 1, wherein the injection molding die injection-molds a plurality of rows of preforms parallel to the second direction. The preform is conveyed while maintaining the preform row pitch at the time of injection molding, and at the heating station, the second conveying path is formed at a pitch between rows smaller than the preform row pitch at the time of injection molding. An injection stretch blow molding apparatus, wherein the refill is conveyed, and in the second transfer section, a reversing mechanism transfers the preforms for each row on a first transfer path to the second transfer path. 3. The cooling device according to claim 2, wherein a first transport mechanism is provided in the first transport path in the cooling station, and the first transport mechanism is wound around a plurality of sprockets on both sides of the first transport path. And a plurality of drive chains that are intermittently rotatable in the vertical direction by the driving means, and a plurality of the drive chains that are held across the pair of drive chains at an interval corresponding to a pitch between rows of the preform during injection molding. A plurality of preform through holes formed at intervals corresponding to a pitch of the preform during blow molding; and a plurality of preform through holes provided in each of the preform through holes. An injection stretch blow molding apparatus, comprising: a support member that supports a flange portion formed on a neck portion of a preform with a body portion of the reform inserted. 4. The apparatus according to claim 3, wherein the transport plate can be stopped at a position where the preform is inclinedly held on the side of the second delivery unit. A plurality of gripping members for gripping the reform; a drawing cylinder for moving the gripping member holding the preform in the inclined state in a direction in which the preform is drawn; and A rotary actuator for turning the preform upside down to bring the preform upside down, and an elevating cylinder for lowering the gripping member for holding the preform in an upside down state so that the preform can be transferred to the second transport path. An injection stretch blow molding apparatus characterized by the above-mentioned. 5. An injection molding step of injecting a preform in an upright state at an injection molding station, and a removing step of taking out the injection molded preform in an upright state from the injection molding station in a first direction. A first delivery step of delivering the taken out preform in an upright state; a cooling step of transporting the delivered preform in an upright state in a first direction and cooling; A second delivery step of turning over the preform that has been inverted and delivering it in an inverted state, and transporting and heating the preform delivered in the second delivery step in the first direction in an inverted state. A heating step, and a third step of delivering the heated preform in an inverted state.
And a blow molding step of conveying the preform delivered in the third delivery step in an inverted state, and stretching and blow molding to form a container. In the injection molding step, A second orthogonal to the first direction
Injection molding a plurality of rows consisting of a plurality of preforms parallel to the direction at the same time, in the take-out step, take out the preforms without changing the pitch between the preforms of each row and the pitch between each row of the injection-molded rows, In the first delivery step, the pitch between the preforms in each row is converted to the pitch at the time of blow molding and delivered while the pitch between the rows of the preforms is maintained, and in the cooling step, the preform in each row is The intermittent conveyance is performed while the pitch between the preforms is maintained at the pitch at the time of blow molding. In the second delivery step, the pitch between the cooled preforms of each row is maintained at the pitch at the time of blow molding and delivered, Then, intermittent conveyance is performed while maintaining the pitch between the preforms in each row at the pitch at the time of blow molding. Injection stretch blow molding method characterized by passing while maintaining the pitch of the preforms to the pitch at the time of blow molding.