JP3612388B2 - Injection blow molding apparatus and injection blow molding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an injection blow molding apparatus and an injection blow molding method, and more particularly, to an injection blow molding apparatus and an injection blow molding method for forming a container by performing injection molding of a preform and performing temperature control and then performing blow molding.
[0002]
[Background]
As an injection blow molding device for molding a container, for example, there is a device as shown in British Patent No. 2093396.
[0003]
This injection blow molding apparatus shown in British Patent No. 2093396 has an injection molding station, a temperature control station, and a blow molding station arranged in an L-shape, and four rows of four preforms are formed in the injection molding station. At the same time, injection molding is performed, and the temperature is controlled at the temperature control station at the same time in four rows, and blow molding is performed at the blow molding station for every two rows of the preforms at the same time. .
[0004]
[Problems to be solved by the invention]
In the injection molding blow molding apparatus shown in British Patent No. 2093396, the blow molding is performed in two times for each of two rows of preforms among four rows of preforms that have been temperature-controlled at the same time. A time difference occurs between the first blow molding and the second blow molding, and the blow molding conditions of the preform change between the first blow molding and the second blow molding. If blow molding is performed with the blow molding apparatus set to the conditions, the first and second blow molding quality will be uneven, and the yield will be reduced.
[0005]
In addition, since the injection molding station, the temperature control station, and the blow molding station are arranged in an L shape, the width of the injection blow molding apparatus becomes large and the apparatus becomes large. As the installation area of the apparatus increases, particularly when molding a container filled with drinking water or the like, it is desired to keep the room in a clean atmosphere. If it is attempted to maintain the atmosphere over a wide area, the equipment cost and the maintenance cost become high. Therefore, it is not possible to satisfy the demand for minimizing the installation area of the apparatus and saving space.
[0006]
Furthermore, in this injection blow molding apparatus, four rows of preforms are simultaneously rotated and conveyed, so that a large temperature control station space is required, and the number of conveyances is relatively small. However, the molding efficiency cannot be increased much.
[0007]
An object of the present invention is to eliminate the waste of the conveyance space during the conveyance of the preform and improve the molding efficiency.
[0008]
Another object of the present invention is to save space by minimizing the installation area of the apparatus.
[0009]
[Means for Solving the Problems]
The invention of claim 1 includes an injection molding station for injection-molding a preform, a first delivery unit for delivering a preform injection-molded at the injection molding station, and the preform delivered from the first delivery unit. A cooling station for cooling the reform, a second delivery unit for delivering the cooled preform, a heating station for heating the preform delivered from the second delivery unit, and the heating station heated by the heating station A third delivery section for transferring the preform, and a blow molding station for forming the container by stretching and blow-molding the preform transferred from the third delivery section are linearly formed along the conveying direction of the preform. Arranged,
The injection molding station has an injection mold that simultaneously performs injection molding of a plurality of preforms in an upright state in the preform conveying direction in a direction perpendicular to the preform conveying direction,
The first delivery unit takes out the plurality of rows of preforms that have been injection-molded at the injection molding station, performs row pitch conversion to narrow the pitch between rows in the transport direction of the preform, and stands upright on the cooling station. Have a delivery mechanism
The cooling station has a plurality of first conveyance paths that intermittently convey the plurality of rows of preforms received from the first delivery unit to the second delivery unit in an upright state,
The second delivery unit distributes the two rows of preforms orthogonal to the conveying direction of the preforms cooled by the cooling station into two hands, and converts the pitch between the preforms into the pitch at the time of blow molding. A mechanism and an inversion delivery mechanism for receiving and reversing the pitch-converted preform and delivering it to the heating station in an inverted state;
The heating station receives the second delivery unit from the second delivery unit.Third delivery sectionA plurality of second transport paths that receive each of the preforms and intermittently transport the preforms in an inverted state, heating boxes disposed along the second transport paths, and at least A rotation mechanism for rotating the preform in the heating box,
The third delivery unit has a transfer mechanism for delivering the preform in an inverted state heated and conveyed by the second conveyance path to the blow molding station in an inverted state,
The blow molding station includes a substantially rectangular third conveyance path having a short side and a long side, and one side of the short side of the third conveyance path.Third delivery sectionReceiving a plurality of preforms in an inverted state, and a stretched blow molding is simultaneously performed on the plurality of preforms provided on one side of the long side of the third conveying path and received by the receiving unit. It has a blow molding part to be molded, and an extraction part that is provided on another short side facing the receiving part and takes out the container molded by the blow molding part.
[0010]
According to the invention of claim 1, an injection molding station and a firstDelivery sectionAnd a cooling station, secondDelivery sectionAnd a heating station,Delivery sectionBy arranging the blow molding station etc. linearly along the preform conveying direction, the apparatus does not spread in the direction perpendicular to the preform conveying direction and can be arranged with a minimum area. The installation area can be reduced to save space, and in particular, the indoor area of a clean atmosphere that forms a container filled with drinking water or the like can be effectively utilized.
[0011]
In addition, at the injection molding station, a plurality of preforms in a single row are injection-molded at the same time, so that the number of preforms corresponding to the blow molding time can be secured and the molding cycle can be made more efficient.
[0012]
In addition, the firstDelivery sectionBy transferring multiple rows of preforms from the injection station to the cooling station and performing additional cooling at the cooling station, the temperature of the preform is lowered from the temperature state of the preform during injection molding, and the effect of temperature control due to reheating is reduced. It is possible to increase the molding stability. The firstDelivery sectionIn order to reduce the pitch between rows in the preform conveyance direction, the distance between the cooling and heating stations can be shortened to reduce the size and cost of the device, and to carry a large number of preforms. Therefore, the molding efficiency is also improved.
[0013]
In addition, the pre-formed preform that has been additionally cooled at the cooling station is the secondDelivery sectionInverted, handed over to the heating station in an inverted state, and heated while being conveyed in an inverted state, without unnecessarily heating the conveying member that supports the neck portion of the preform and the preform in an inverted state during heating, It is possible to reliably prevent adverse effects due to deformation of the neck portion and heat of the conveying member. Moreover, the preform can be uniformly heated in the circumferential direction by rotating the preform by the rotation mechanism.
[0014]
In addition, the thirdDelivery sectionThe preforms are delivered in an inverted state to the blow molding stations provided in parallel, and at each blow molding station, the preforms are received by the receiving portion provided on the short side of the third conveyance path, and provided on the long sides. Stretch blow molding can be performed simultaneously on the number of preforms received in the blow molding section, and the container can be taken out at the take-out section provided on the other short side, and by performing blow molding in an inverted state, There is no need to provide an elevating device such as a stretching rod above, and the overall height of the device can be reduced to save space and facilitate maintenance. In addition, by arranging the blow molding part on the long side, the blow mold clamping mechanism can be installed in the space between the long sides, and the space between the long sides can be used effectively.
[0015]
The invention of claim 2 is an injection molding station for simultaneously injection-molding a plurality of first number of preforms in the preform conveying direction in a direction orthogonal to the preform conveying direction;
Injection molded at the injection molding stationTake the multiple rows of preforms And column pitch conversion to narrow the column pitch in the preform transport direction.A delivery section to deliver,
A cooling station that intermittently conveys and cools the preform received from the delivery unit in the conveyance direction of the preform;
Less than the first number cooled at the cooling stationA heating station for heating and conveying each second number of preforms;
And a blow molding station for forming a container by stretch blow molding each of the second number of preforms heated by the heating station.
[0016]
According to the invention of claim 2, since the second number of preforms heated at the same time are simultaneously blow-molded, there is no difference in blow-molding time between the simultaneously heated preforms, and the molding conditions become uniform. Uneven quality can be prevented.
[0017]
The invention of claim 3 is the invention of claim 2,
PreviousColdThe rejection station transports and cools the first number of the preforms injection-molded at the injection molding station.
[0018]
According to the invention of claim 3, before the heating by the heating station, the preform is further cooled from the temperature state at the time of injection molding to the preform at the cooling station, so that the temperature of the preform is lowered and reheated by the heating station. The effect of temperature control at the time can be increased and the molding stability can be improved.
[0019]
The invention of claim 4 is an injection molding station for simultaneously injection-molding a plurality of first number of preforms in the preform transport direction in a direction orthogonal to the preform transport direction;
A first delivery unit that takes out the plurality of preforms that have been injection-molded at the injection molding station, and performs delivery by performing row pitch conversion that narrows the pitch between rows in the transport direction of the preform;
A cooling station for intermittently transporting and cooling the plurality of rows of preforms received from the first delivery unit in the transport direction of the preforms;
A heating station that heats and conveys a second number of preforms less than the first number cooled in the cooling station;
And a blow molding station that simultaneously stretch-blow molds the second number of preforms heated simultaneously in the heating station to mold the container.
[0020]
According to the invention of claim 4, before the heating by the heating station, the preform is further cooled from the temperature state at the time of injection molding at the cooling station, thereby lowering the temperature of the preform and reheating by the heating station. The effect of temperature control at the time can be increased and the molding stability can be improved.
[0021]
In addition, since each second number of preforms that are heated at the same time are blow-molded simultaneously, there is no difference in blow molding time between the preforms that are simultaneously heated, the molding conditions are uniform, and unevenness in molding quality can be prevented. .
[0022]
The invention of claim 5 is, in claim 4,
A second delivery section that transforms the first number of preforms in the row cooled by the cooling station to the heating station by converting the pitch between the preforms into the pitch at the time of blow molding. Have
The heating station transports and heats the second number of the preforms delivered from the second delivery unit through a plurality of second conveyance paths.
[0023]
According to the fifth aspect of the present invention, it is possible to facilitate the delivery of the preform from the heating station to the blow molding station by converting the pitch between preforms at the time of blow molding at the heating station.
[0024]
The invention of claim 6 is the invention of claim 5,
The second delivery unit distributes the first number of preforms to a plurality of the second conveyance path sides, and sets the pitch between the preforms at the positions corresponding to the second conveyance paths at the time of the stretch blow molding. A pitch conversion mechanism that converts the pitch into half of the pitch of the pitch and a delivery mechanism that takes out every other preform from the number of preforms subjected to the pitch conversion and delivers them to each second transport path. And
[0025]
According to the sixth aspect of the present invention, the pitch conversion mechanism converts the pitch to a half pitch at the time of blow molding, and by taking out every other pitch, it is not necessary to change the pitch of the delivery mechanism, and the mechanism can be simplified. I can do it.
[0026]
The invention of claim 7 is the invention of claim 6,
The pitch conversion of the preform in the pitch conversion mechanism is performed by a guide member that slides along a plurality of guide grooves that suspend and support the preform and changes the pitch as it moves.
[0027]
According to the seventh aspect of the present invention, pitch conversion can be reliably performed with a simple configuration of a guide member without using a complicated mechanism for pitch conversion.
[0028]
The invention of claim 8 is a step of simultaneously injection-molding a plurality of preforms in a row over a direction orthogonal to the conveying direction of the preform by an injection mold.
Transporting the plurality of preforms while maintaining a pitch between the preforms in a direction perpendicular to the transport direction of the preforms, and cooling the preforms;
A step of transporting and heating a smaller number of the preforms in a direction orthogonal to the transport direction of the preforms than the plurality of cooled preforms; and
A step of serially conveying a plurality of preforms heated in the heating step in a state along the conveying direction and performing stretch blow molding;
It is characterized by including.
[0029]
According to the invention of claim 8, the transporting distance is obtained by transferring the cooling process to the heating process in a direction orthogonal to the transporting direction of the preform and converting the preform into a state along the transporting direction in the blow molding process. As a result, the apparatus can be miniaturized and the cost can be reduced.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
[0031]
FIGS. 1-11 is a figure which shows the injection blow molding apparatus which concerns on one embodiment of this invention.
[0032]
FIG. 1 is a plan view showing the overall configuration of the injection blow molding apparatus 20.
[0033]
The injection blow molding apparatus 20 includes an injection molding station 22 and a firstDelivery section24, cooling station 26, secondDelivery section28, heating station 30, and thirdDelivery section32 and the blow molding station 34 are arranged linearly along the conveying direction A of the preform 36.
[0034]
The injection molding station 22 has an injection molding device 42 connected to an injection device 40, and a row of eight preforms 36 in a direction B orthogonal to the conveyance direction A of the preform 36 is transferred in the conveyance direction of the preform 36. Two rows are simultaneously injected into A (see FIG. 4).
[0035]
2 and 4, the injection molding device 42 can be moved up and down via a tie rod 48 by a lower clamping plate 46 fixed to the bed 44 and a lower clamping plate 46 by a clamping cylinder (not shown). And an injection mold apparatus 52 provided between the lower mold clamping plate 46 and the upper mold clamping plate 50.
[0036]
The injection mold apparatus 52 includes an injection cavity mold 54, an injection core mold 56, an injection core mold fixing plate 58, an injection core mold pressing plate 60, a neck cavity mold 62, a neck mold fixing plate 64, and a stripper. It has a plate 66 and a neck type fixed plate guide rail 68.
[0037]
The injection cavity mold 54 has 16 cavities for forming one row of eight preforms 36 in the conveyance direction A over the direction B orthogonal to the conveyance direction A of the preform 36. It is attached to the lower clamping plate 46 on the fixed side via a hot runner 70 to be connected.
[0038]
The number of injection core molds 56 corresponds to the number of cavities of the injection cavity mold 54 and is attached to the injection core mold fixing plate 58 so that the mold can be closed with respect to the injection cavity mold 54.
[0039]
The injection core mold fixing plate 58 is attached to the movable upper mold clamping plate 50 side.
[0040]
The injection core mold holding plate 60 is attached to the injection core mold fixing plate 58 between the injection core mold fixing plate 58 and the upper mold clamping plate 50.
[0041]
The number of neck cavity molds 62 corresponds to the number of injection core molds 56, and each neck cavity mold is composed of a split mold and can be closed with respect to the injection core mold 56.
[0042]
The neck type fixing plate 64 is composed of divided plates that respectively hold the split molds of eight neck cavity molds 62 for one row.
[0043]
The stripper plate 66 can be moved up and down relative to the injection core mold fixing plate 58 between the neck mold fixing plate 64 and the injection core mold fixing plate 58. That is, the stripper plate 66 has a connecting portion that connects to the lower end of the stripper plate lifting rod of the stripper plate lifting cylinder 72 provided on the upper mold clamping plate 50, and the injection core mold is fixed by driving the stripper plate lifting rod. The plate 58 can be moved up and down. The stripper plate 66 has a contact portion 82 that contacts the lower end of the release rod 80 of the hydraulic release cylinder 78 provided on the upper mold clamping plate 50, and is a stripper plate with respect to the neck type fixing plate 64. 66 is moved down to release the preform 36 from the injection core mold 56. Further, the lower limit position of the stripper plate 66 at which the preform 36 cannot be completely removed is restricted by a stopper rod attached to the lower surface of the upper mold clamping plate 50.
[0044]
The neck type fixing plate guide rail 68 is constituted by a dividing member attached to each of the dividing plates constituting the neck type fixing plate 64, slidably engages with the stripper plate 66, and the neck type fixing plate 64 is connected to the neck cavity. The mold 62 can be slid in the mold opening direction. Each split member of the neck type fixed plate guide rail 68 is urged in the mold closing direction of the neck cavity die 62 by an urging means 92 such as a spring and the neck provided on the upper die clamping plate 50 on the upper surface. It has a wedge hole for receiving a neck type opening cam connected to the mold opening cylinder 94. The neck cavity opening 62 is opened by inserting the neck opening cam into the wedge hole and opening the neck fixing plate guide rail 68.
[0045]
Therefore, in the injection molding station 22, first, the upper mold clamping plate 50 of the injection molding apparatus 42 is lowered through the tie rod 48 by driving a mold clamping drive cylinder (not shown), and the neck mold fixing plate 64 is placed on the injection cavity mold 54. The stripper plate 66, the injection core mold fixing plate 58, and the injection core mold holding plate 60 are overlapped, and the injection cavity mold 54, the injection core mold 56, and the neck cavity mold 62 are closed. By injecting resin into the cavities, two rows of eight preforms in the direction B perpendicular to the conveying direction A of the preform 36 are simultaneously injection-molded.
[0046]
Next, after the injection-molded preform 36 is cooled for a predetermined time, the upper mold clamping plate 50 is raised by a mold clamping drive cylinder (not shown) to release the preform 36 from the injection cavity mold 54.
[0047]
Next, the hydraulic release cylinder 78 is driven to bring the lower end of the release rod 80 into contact with the contact portion 82 of the stripper plate 66, and the stripper plate 66 is slightly lowered with respect to the injection core mold fixing plate 58. A gap is formed between the inner surface of the preform 36 and the injection core mold 56, and the preform 36 is released from the injection core mold 56 while the neck cavity mold 62 holds the neck portion of the preform 36.
[0048]
Next, with the preform 36 released from the injection core mold 56, the stripper plate lifting cylinder 72 is driven to lower the lower end of the stripper plate lifting rod to lower the stripper plate 66.
[0049]
In this case, the stripper plate 66 is reliably stopped by the stopper rod at the lower limit position where the injection core die 56 does not come out completely.
[0050]
Next, at this lowering lower limit position, the neck-type opening cam 96 is lowered by driving the neck-type opening cylinder 94 and is inserted into a wedge hole formed on the upper surface of the neck-type fixing plate guide rail 68 to be inserted into the neck type fixing plate guide rail 68. Is opened, the neck mold fixing plate 64 opens the neck cavity mold 62, and the neck portion of the preform 36 is released from the neck cavity mold 62 at that position, and is dropped and taken out.
[0051]
At this time, since the injection core mold 56 remains in the preform 36, it is regulated by the injection core mold 56, and the preform 36 can be dropped at a substantially central position.
[0052]
FirstDelivery section3 and 4, as shown in FIGS. 3 and 4, a plurality of rows of preforms 36 are received from the injection molding station 22 and transferred to the cooling station 26 in an upright state. An unloading mechanism 102 for the transfer, A receiving mechanism 104.
[0053]
The take-out mechanism 102 has two take-out plates 106a and 106b extending in a direction B perpendicular to the conveying direction A of the preform 36, and the pitch between the rows of the preforms 36 taken out for each row by the take-out plates 106a and 106b. And a transfer mechanism 110 for transferring the extraction plates 106 a and 106 b between the injection molding station 22 and the cooling station 26.
[0054]
The extraction plates 106a and 106b each have eight holes 112 through which the preforms 36 can be passed at intervals corresponding to the intervals between the preforms 36 in the injection molding station 22. A pair of two preform support plates each having a notch is provided in each hole 112. A flange portion provided at the lower portion of the neck portion of the preform 36 is placed on the preform support plate, and the body portion of the preform 36 is inserted into the U-shaped notch. The preform support plates of each set are fixed to the opening / closing rods 116a and 116b, respectively, and the springs provided at the ends of the opening / closing rods 116a and 116b are urged in the closing direction of the preform support plates of each set. ing. Then, in a state where the extraction plates 106a and 106b are arranged at the delivery position to the cooling station 26 in FIG. 1, the pressing plate 120 presses the end portions of the opening and closing rods 116a and 116b by the extraction plate opening / closing cylinder 118, thereby The reform 36 is opened.
[0055]
The row pitch conversion mechanism 108 fixes the tip of the first extraction cylinder rod 124 of the first extraction cylinder 122 fixed to the end of the extraction plate 106a to the end of the extraction plate 106b, and drives the first extraction cylinder 122. Thus, the pitch of the extraction plates 106a and 106b is changed. Then, the maximum pitch between the extraction plates 106a and 106b is regulated by connecting the extraction plates 106a and 106b with a stopper 126 fixed to one side. The extraction plates 106a and 106b are slidably engaged with the second extraction guide rail 128, respectively, and a pitch changing operation is performed along the second extraction guide rail 128.
[0056]
The transfer mechanism 110 moves the extraction plates 106 a and 106 b to the respective positions of the injection molding station 22 and the cooling station 26 by the second extraction cylinder 132 fixed to the second extraction cylinder fixing plate 131 attached to the extraction mechanism support 130. It is movable.
[0057]
The tip of the second extraction cylinder rod 134 of the second extraction cylinder 132 is attached to the second extraction cylinder rod fixing plate 136, and this second extraction cylinder rod fixing plate 136 is fixed to the first extraction guide rail attachment plate 138. ing. The first extraction guide rail mounting plate 138 is fixed to the end of the extraction plate 106a, and the second guide member 40 of the second extraction guide rail 128 is mounted inside the first extraction guide rail mounting plate 138. A first take-out guide rail 142 is attached to the outside.
[0058]
Further, the first take-out guide rail 142 is a first guide member fixed to the take-out mechanism support 130.144 is guided.
[0059]
Therefore, when the second extraction cylinder rod 134 of the second extraction cylinder 132 is extended from the state in which the extraction plates 106a and 106b have narrowed the pitch on the cooling station 26 side, the second extraction cylinder fixing plate 136 and the first extraction guide rail are attached. When the first take-out guide rail 142 is moved along the first guide member 144 to the injection molding station side 22 through the plate 138 and the first take-out cylinder rod 124 of the first take-out cylinder 122 is extended, the take-out plate 106b is moved between the rows. The maximum pitch is regulated by a stopper 126 that moves in the direction of widening the pitch and connects the extraction plates 106a and 106b, and reaches the second extraction guide rail 128 to a position corresponding to the pitch between rows of the preforms 36 in the injection molding station 22. The pitch between rows will be widened along.
[0060]
In this state, when the stripper plate 66 is lowered at the injection molding station 22, the neck cavity mold 62 is opened and the preform 36 is dropped, the preform 36 is placed on the preform support plate 114 of each extraction plate 106a, 106b. Will be supported.
[0061]
Next, the first take-out cylinder rod 124 of the first take-out cylinder 122 is contracted to narrow the pitch of the take-out plates 106a and 106b, and the second take-out cylinder rod 134 of the second take-out cylinder 132 is contracted to reduce the take-out plates 106a and 106b. If the pressure plate 120 is pressed against the opposing ends of the open / close rods 116a and 116b by the take-out plate opening / closing cylinder 118 by moving the receiving mechanism 104 above the cooling station 26 side, the preform support plates 114 are opened and the preform 36 is opened. Is opened and delivered to the receiving mechanism 104 side.
[0062]
The receiving mechanism 104 includes two receiving plates 146a and 146b corresponding to the extraction plates 106a and 106b, and a first elevating mechanism 148 that raises and lowers the receiving plates 146a and 146b.
[0063]
The receiving plates 146a and 146b have the same configuration as the extraction plates 106a and 106b. In addition, the receiving plates 146a and 146b have a pitch corresponding to the state in which the column pitch conversion is not performed and the extraction plates 106a and 106b are narrowed.
[0064]
The first elevating mechanism 148 is provided with a support plate 160 on the upper end of a guide rod 154 guided by a guide member 152 provided on the elevating mechanism fixing base 150, and receiving plates 146 a and 146 b are supported on the support plate 160. The first elevating cylinder 156 that raises and lowers the distance H from the receiving position C to the standby position D on the receiving plates 146a and 146b, and the second that raises and lowers the distance J from the standby position D to the delivery position E. Lifting cylinder158With.
[0065]
The first lifting cylinder 156 is a second lifting cylinder158The tip of the first lifting cylinder rod is fixed to the lower surface of the support plate 160.
[0066]
The second lifting cylinder 158 is fixed to the lifting mechanism fixing base 150.
[0067]
A receiving plate opening / closing cylinder 162 is provided on the support plate 160.
[0068]
Accordingly, when the receiving plates 146a and 146b are at the standby position D, the receiving plates 146a and 146b move the distance H by the ascending drive of the first elevating cylinder 156, and the take-out plate 106a which is the receiving position of the preform 36. , 106b.
[0069]
In this state, when the preform support plates of the extraction plates 106a and 106b are opened, the preform 36 falls, and the preform 36 is inserted into the holes of the receiving plates 146a and 146b, and is provided at the lower portion of the neck portion. The flange portion is supported by the preform support plate.
[0070]
Next, the first lifting cylinder 156 and the second lifting cylinder158Thus, the receiving plate 146a, 146b is lowered to the delivery position E through the standby position D, and the receiving plate opening / closing cylinder 162 presses the opening / closing rod to open the preform supporting plate. It is dropped from 146a and 146b and delivered to the cooling station 26.
[0071]
The cooling station 26 is configured as shown in FIGS.Delivery sectionThe 16 preforms 36 of every two rows with a narrow row pitch received from 24Delivery section28, which are intermittently conveyed and cooled. Eight first conveyance paths 166 corresponding to the number of preforms 36 in one row, and one row of preforms 36 in the middle of conveyance of the first conveyance path 166. A column correction mechanism 168 that corrects the displacement of the column, a gate cut mechanism 170 that cuts the gate at the bottom of the preform 36 from below the preform 36, and an extrusion mechanism 172 that pushes the preform 36 at the end of the first conveyance path 166, Have
[0072]
The first conveyance path 166 includes an injection molding station 22 side and a secondDelivery sectionThe conveyor belt 176 includes two conveyor belts 176 that are stretched along the conveyance direction of the preform 36 on two pulleys 174a and 174b disposed on the 28th side.
[0073]
The pulley 174a on the injection molding station 22 side is attached to one shaft 178a, and the secondDelivery sectionThe 28-side pulleys 174a are respectively attached to a plurality of shafts 178b so as to be able to form the conveyance paths of the first conveyance paths 166, and one of the pulleys 174b attached to the plurality of shafts 178b is used for intermittent driving. A first transport motor 180 is connected.
[0074]
Then, the rotational force is transmitted to the pulley 174b connected to the first transport motor 180, and the pulley 174b rotates to all the pulleys 174a attached to one shaft 178a by the transport belt 176 stretched over the pulley 174b. A force is transmitted, and a rotational force is transmitted from each pulley 174a to each pulley 174a on the opposite side via each conveyance belt 176.
[0075]
In each first conveyance path 166, the lower surface of the flange portion formed on the outer periphery of the lower portion of the neck portion of the preform 36 is supported by two conveyance belts 176 from the side surface side of the preform 36. . The first transport path 166 is provided with a blower (not shown), and cooling air is supplied to the preform 36 transported through the first transport path 166 by the blower and cooled. .
[0076]
Accordingly, the eight rows of preforms 36 are supported in an upright state by the conveyor belt 176, and the second preform 36 from the injection molding station 22 side along the first conveyor path 166.Delivery sectionIn the state where the pitch narrower than the pitch at the time of injection molding is maintained toward the side 28, the air is cooled by the blowing means while being intermittently conveyed.
[0077]
The column correction mechanism 168 includes eight centering cores 182 provided in correspondence with each first transport path 166 at the upper position near the end of the first transport path 166, and a centering mechanism that moves the centering core 182 up and down. A core lifting mechanism 184.
[0078]
The centering core lifting mechanism 184 lowers the centering core and inserts it into the mouth of the preform 36 with respect to the eight rows of preforms 36 that are intermittently conveyed to the position corresponding to the centering core 182 and stopped. Thus, the row of preforms 36 is aligned.
[0079]
The gate cut mechanism 170 is provided at the position corresponding to the row correction mechanism 168 at the position below the first transport path 166 and corresponding to each first transport path 166, and eight gate cutters 186 are moved up and down. A gate cutter lifting mechanism 188.
[0080]
When the centering core 182 of the column correction mechanism 168 is inserted into the mouth of the preform 36 to perform column correction, the gate cutter lifting mechanism 188 raises the gate cutter 186 to perform the preform from below the preform 36. The gate at the bottom of 36 is cut off.
[0081]
The extrusion mechanism 172 includes an extrusion plate 190 disposed along the row direction of the preform 36 at the end position of the first conveyance path 166, an extrusion cylinder 192 connected to the extrusion plate 190, and the extrusion cylinder 192. And a vertically moving cylinder (not shown) for vertically moving the front end portion.
[0082]
Then, in a state where the row-corrected preform 36 is intermittently conveyed to the final end position of the first conveyance path 166 and stopped, the vertical movement cylinder lowers the front end portion of the extrusion cylinder 192, and the extrusion plate 190 is moved. The first row of preforms 36 in the final end position is positioned behind the extrusion plate 190 and the extrusion plate 190 is pushed forward by the extrusion cylinder 192 in this state.Delivery sectionIt is made to move to 28.
[0083]
SecondDelivery section28 is a pitch conversion mechanism 264 that receives eight preforms 36 in one row from the cooling station 26 and divides each of the four preforms 36 into two, and changes the pitches between the preforms 36 in the heating station 30. An inversion delivery mechanism 266 that inverts the reform 36 and delivers it to the heating station 30 in an inverted state.
[0084]
The pitch conversion mechanism 264 receives the flange portion at the lower portion of the neck portion of the preform 36, slides the preform 36 along the four guide grooves 268 for supporting the preform 36 in a suspended manner, and reduces the pitch as it moves. The guide member 270, two sets of receiving members 272 having four holding portions 274 for supporting the lower surface of the flange portion of the preform 36 guided and conveyed by the guide member 270, and the receiving member 272 of the preform 36. A moving mechanism (not shown) that moves in a direction orthogonal to the conveying direction A. Then, the preform 36 is moved from the guide groove 268 to the receiving member 272 by the extrusion plate 190. The pitch conversion mechanism 264 sets the pitch between every four preforms 36 held by each receiving member 272 to ½ of the pitch at the time of blow molding. Further, the moving mechanism moves the receiving member 272 by a distance corresponding to the interval between the holding portions 274.
[0085]
Two sets of reverse delivery mechanisms 266 are provided at positions corresponding to the receiving members 272 at the delivery position of the pitch conversion mechanism 264.
[0086]
Each inversion delivery mechanism 266 opens and closes two first gripping members 282 arranged at positions corresponding to every other holding member 274 among the holding portions 274 of each receiving member 272, and these first gripping members 282. The figure which raises / lowers the 1st holding member 282 with the 1st opening / closing mechanism 286 which has the opening / closing cylinder 284, the inversion mechanism 290 which has the inversion actuator 288 which inverts the 1st holding member 282, and the 1st opening / closing mechanism 286 and the inversion mechanism 290. A lifting mechanism (not shown).
[0087]
And it converts into 1/2 pitch between the preforms 36 in the heating station 30 along the guide groove 268 of the guide member 270 of the pitch conversion mechanism 264, and each of the four preforms 36 is positioned at the delivery position.
[0088]
Next, with respect to the preform 36 held by each receiving member 272, the neck portion side of the preform 36 held by every other holding portion 274 of each receiving member 272 with the first gripping member 282 opened. In this state, the first holding member 282 is closed by the open / close cylinder 284 to hold the neck portion.
[0089]
Next, the first gripping member 282 is reversed from the cooling station 26 side to the heating station 30 side by the reversing actuator 288, and the preform 36 is inverted.
[0090]
Then, when the first gripping member 282 is lowered by an elevating mechanism (not shown) and the first gripping member 282 is opened by the opening / closing cylinder 284, the neck portion of the preform 36 is released and is received by the heating station 30 in an inverted state. Will be passed.
[0091]
Next, the receiving member 272 is moved by the moving mechanism, and the remaining preform 36 is delivered in a state where the holding portion 274 where the preform 36 remains is moved to a position corresponding to the first gripping member 282. ing.
[0092]
As shown in FIG. 1 and FIGS.Delivery sectionThe preform 36 supplied from 28 is heated, and includes a second conveyance path 200, a heating box 202, and a rotation mechanism 204 arranged in parallel.
[0093]
Each second transport path 200 is a secondDelivery sectionA plurality of first transport members 206 that support the four preforms 36 delivered in two hands from 28 in an inverted state, and the plurality of first transport members 206 along the transport direction A of the preforms 36. A first transport mechanism 208 for intermittent transport.
[0094]
Two first conveying members 206 are provided in a direction orthogonal to the conveying direction A of the preforms 36 in each second conveying path 200, and the two first conveying members 206 are in the conveying direction of the preforms 36. A plurality are arranged along A at a predetermined interval.
[0095]
Each first transport member 206 is rotatably attached to the bracket 212, the preform support portion 214 protrudes from the upper surface of the bracket 212, and the neck portion of the preform 36 is inserted into the preform support portion 214, The preform 36 can be supported in an inverted state. A rotation sprocket 216 is attached to the lower end of each first transport member 206.
[0096]
Each first transport mechanism 208 includes a first transport chain 218 and a first transport actuator 220.
[0097]
Each first transport chain 218 is disposed between the two first transport members 206 along the transport direction of the preform 36, and is supported by the driven sprocket 222 on the cooling station 26 side.Delivery sectionIt is in a state of being supported by a drive sprocket (not shown) connected to the first transport actuator 220 on the 32 side. An intermediate portion of the bracket 212 to which the first transport member 206 is attached is connected and fixed to the first transport chain 218. The first transport chain 218 is guided by a first transport rail 224 disposed along the second transport path 200.
[0098]
The first transport actuator 220 intermittently drives the first transport chain 218 via a drive sprocket (not shown), and includes a cam 226 and a stopper device 228.
[0099]
The cam 226 has a notch 230 for intermittent stop provided on the outer periphery every 90 degrees.
[0100]
The stopper device 228 includes a cam follower 232 engaged with the notch 230 of the cam 226 and an air cylinder 234 for driving the cam follower 232. By driving the air cylinder 234, the cam follower 232 is engaged with the notch 230 of the cam 226, and the first transport actuator 220 is intermittently stopped every 90 degrees.
[0101]
The heating box 202 is a set of two pieces disposed on both sides of the second conveyance path 200 in the middle of each second conveyance path 200, and the two sets of heating boxes 202 are the preform 36. Two sets are provided upstream and downstream along the conveyance direction A.
[0102]
Further, an interval corresponding to one preform 36 is provided between the upstream and downstream heating boxes 202, and the preform 36 is intermittently stopped at this position, and is heated by the upstream heating box 202. The temperature difference between the inner and outer surfaces of the preform 36 is relaxed so that it can be supplied to the heating box 202 on the downstream side.
[0103]
The interval between the upstream and downstream heating boxes 202 is not limited to the interval of one preform 36 but can be changed depending on the thickness of the preform 36.
[0104]
Further, a reflector 236 is provided between the two heating boxes 202 along the conveying direction A of the preform 36 in a state of blocking the two preforms 36.
[0105]
Each heating box 202 is provided with a plurality of stages of heaters 238 along the conveying direction A of the preform 36 in the axial direction of the preform. As shown in the second heating box 202 from the left in FIG. 8, each of these heaters 238 is supported so as to be movable back and forth with respect to the preform 36, and the temperature distribution in the axial direction of the preform 36 can be adjusted. ing.
[0106]
Each heating box 202 is in a state in which a reflector 240 is provided on the back side of the heater 238 and a terminal block 242 is provided on the upper end. The lower part of each heating box 202 is supported on the bed 246 by a hollow support foot 244 communicating with the inside of the heating box 202, and the support foot 244 is connected to a blower 248 attached in the bed 246.
[0107]
Then, cooling air is supplied from the blower 248 to the back side of the reflector 240 in the heating box 202 through the support legs 244, and this cooling air is allowed to escape above the heating box 202. As a result, overheating of the reflector 240 can be prevented, the life of the reflector 240 can be extended, the terminal block 242 is also cooled by the cooling air that flows upward, and the cooling air sent from the blower 248 is The heaters 238 extending in the conveying direction A of the preform 36 are also in contact with both end support portions, and the support portions at both ends that are most likely to be damaged by heat are cooled to extend the life of the heater.
[0108]
As shown in FIG. 6, the rotation mechanism 204 includes a first rotation chain 250 and a second rotation chain 252.
[0109]
The first rotation chain 250 is disposed between the two second conveyance paths 200 and is disposed in the vicinity of the rotation sprocket 216 of the first conveyance member 206 conveyed inside each second conveyance path 200. Three driven sprockets 254 without teeth and a drive sprocket 258 between the driven sprockets 254 and connected to the motor for rotation 256 shown in FIG. The conveyor member 206 is in mesh with the rotation sprocket 216. The first rotation chain 250 is engaged with a sprocket 260 for applying tension.
[0110]
The second rotation chain 252 is supported by a sprocket 262 having no teeth over the substantially entire length of the second conveyance path 200 between the first conveyance members 206 conveyed in two rows of the respective second conveyance paths 200. The second rotation chain 252 is in mesh with the rotation sprocket 216 of the first conveyance member 206 conveyed in two rows of the second conveyance paths 200.
[0111]
Accordingly, when the driving sprocket 258 is rotated by the rotation motor 256 to rotate the first rotation chain 250, the three first transfer members 206 of the respective second transfer paths 200 that mesh with the first rotation chain 250. The rotation sprocket 216 rotates. Each of the three rotation sprockets 216 rotates the second rotation chain 252. Then, another rotation sprocket 216 that meshes with the second rotation chain 252 rotates to rotate the preform 36.
[0112]
Then, by heating the preform 36 while rotating in this way, the preform 36 can be heated uniformly in the circumferential direction.
[0113]
ThirdDelivery sectionAs shown in FIGS. 5, 7, 9 and 10, 32 transfers four preforms 36 heated at each heating station 30, and the preforms 36 in an inverted state remain in an inverted state. A pair of transfer mechanisms 300 to be transferred to the blow molding station 34 and a pair of pitch changing mechanisms 302 for converting the pitch of the preform 36 at the heating station 30 into a pitch at the time of blow molding at the blow molding station 34 are provided.
[0114]
The pair of transfer mechanisms 300 are respectively mounted on the pair of transfer mechanism bases 304, and the pair of pitch changing mechanisms 302 make the pair of transfer mechanism bases 304 movable.
[0115]
Each transfer mechanism 300 includes a second gripping member 306, a second opening / closing mechanism 308, a moving mechanism 310, and a second lifting / lowering mechanism 312.
[0116]
The second gripping member 306 in each transfer mechanism 300 is a one-to-one pair arranged so as to be capable of gripping the neck portion of the preform 36. Two second gripping members 306 are provided by each second transport path 200. Two sets are arranged corresponding to the position of the preform 36 to be conveyed.
[0117]
The second opening / closing mechanism 308 includes two pairs of transfer arms 314 a and 314 b to which the second gripping member 306 is attached, corresponding to the second gripping member 306. The pair of transfer arms 314a and 314b is constituted by a pair of upper and lower arm members 316a and 316b in FIGS. 9 and 10, respectively.
[0118]
The arm members 316a and 316b of the transfer arms 314a and 314b are supported by a pair of parallel rotating shafts 318a and 318b that are slidable in the axial direction.
[0119]
As shown in FIG. 9, a pin 320 projects from the mounting hole formed in the mounting portion of the rotation shaft 318a, 318b of the arm member 316a, 316b. In FIG. 9, the left half of the drawing shows the upper arm member 316a, and the right half shows the lower arm member 316b. An axial slide groove 324 is formed at a position corresponding to the pin 320 of the arm member 316a on the transfer arm 314a side on the rotary shaft 318a to which the arm members 316a of the pair of transfer arms 314a and 314b are attached, and the transfer arm 314b. A hole 322 that engages with the pin 320 is formed at a position corresponding to the arm member 316a.
[0120]
Further, the rotation shaft 318b attached to the arm member 316b of the transfer arm 314a, 314b includes a pin of the arm member 316b of the transfer arm 314a (shown by partially cutting off the upper arm member 316a in the upper portion in FIG. 5). A hole 322 that engages with the pin 320 is formed at a position corresponding to 320, and an axial slide groove 324 is formed at a position corresponding to the pin 320 of the arm member 316b of the transfer arm 314b. Further, a rack portion 326 is formed on the circumference at positions corresponding to the rotary shafts 318 a and 318 b, and a pinion 328 is disposed between the rack portions 326.
[0121]
Further, an opening / closing cylinder 330 is connected to one of the rotating shafts 318b, and the opening / closing cylinder 330 is driven to slide the rotating shafts 318a, 318b in opposite directions to be provided on the arm member 316a of the transfer arm 314a. The pin 320 is slid in the slide groove 324 of the rotation shaft 318a, and the pin 320 provided on the arm member 316b of the transfer arm 314b is slid in the slide groove 324 of the rotation shaft 318b, thereby transferring the transfer arms 314a and 314b. The second gripping member 306 can be opened and closed by moving them apart and close to each other.
[0122]
The moving mechanism 310 includes a transfer actuator 332 connected to one of the rotating shafts 318a, tooth portions 334 formed on corresponding outer peripheral surfaces of the rotating shafts 318a and 318b, and a sprocket 336 connected to these tooth portions 334. Prepare.
[0123]
Then, when the rotation shaft 318a is rotated by the transfer actuator 332, the rotation shaft 318b is rotated together with the rotation shaft 318a via the tooth portion 334 and the sprocket 336, and transfer arms 314a and 314b attached to the rotation shafts 318a and 318b are rotated. It will rotate between the heating station 30 and the blow molding station 116.
[0124]
In this case, the arm members 316a and 316b of the transfer arms 314a and 314b perform the same operation as the parallel link, and move the second gripping member 306 up and down as it is.
[0125]
Accordingly, the preform 36 conveyed by the second conveyance path 200 in the inverted state is transferred to the blow forming station 116 while being inverted by the transfer arms 314a and 314b.
[0126]
The second lifting mechanism 312 includes a lifting platform 338 that supports the second gripping member 306, the second opening / closing mechanism 308, and the moving mechanism 310, and a lifting guide that extends downward from the lifting platform 338 and penetrates the transfer mechanism base 304. A rod 340 and an elevating cylinder 342 that is mounted on the transfer mechanism base 304 and moves the elevating table 338 up and down are provided.
[0127]
The second gripping member 306 can be moved up and down by a distance X by which the neck portion of the preform 36 is inserted into and removed from the first conveying member 206 and the like by the lifting cylinder 342.
[0128]
The pitch changing mechanism 302 includes a guide rod 344 that supports the transfer mechanism bases 304 so as to be slidable in directions close to and away from each other, and a pitch change cylinder 346 that slides the transfer mechanism base 304.
[0129]
Then, after receiving the preform 36 from the second conveyance path 200 of the heating station 30 in a state where the transfer mechanisms 300 are separated from each other, the transfer mechanisms 300 are brought close to each other by the pitch changing cylinder 346 and the pre-process received from the heating station 30 is received. The pitch of the reform is changed to the blow molding pitch at the blow molding station 34 and delivered to the blow molding station 34. When the transfer mechanism base 304 is moved, the stop position is regulated by the shock absorber 348.
[0130]
When the transfer mechanism 300 and the pitch changing mechanism 302 are configured as described above, the second gripping member 306 is transferred to the second transfer of the heating station 30 when the preform 36 is transferred from the heating station 30 to the blow molding station 34. When the first conveying member 206 arrives at the take-out position and stops at the position corresponding to the first conveying member 206 in the path 200, the second holding member 306 is closed by the second opening / closing mechanism 308. The neck portion of the preform 36 is gripped.
[0131]
In this state, the second lifting / lowering mechanism 312 raises the second gripping member 306 by the distance X, and the neck portion of the preform 36 is extracted from the first conveying member 206.
[0132]
Further, from this state, the transfer mechanism 314a, 314b is moved from the heating station 30 side to the blow molding station 34 side by moving the moving mechanism 310, and the preform 36 remains in an inverted state. Forward.
[0133]
In this case, by driving the pitch changing cylinder 346 of the pitch changing mechanism 302, the transfer mechanisms 300 are moved toward each other to change the pitch to the blow molding pitch by the blow molding station 34.
[0134]
Then, the second gripping member 306 is lowered by the second elevating mechanism 312 and the second gripping member 306 is opened by the second opening / closing mechanism 308, so that the preform 36 is delivered to the blow molding station 34.
[0135]
As shown in FIGS. 1 and 11, the blow molding station 34 includes a third conveyance path 400, a receiving unit 402, a blow molding unit 404, and a takeout unit 406.
[0136]
The third conveyance path 400 has a substantially rectangular shape having a short side and a long side.Third delivery unit 32The second transport member 408 and the second transport mechanism 410 are provided.
[0137]
The second transport members 408 support and transport the preforms 36 in an inverted state, and are supported one by one on the brackets 414 with the preform support portions 412 protruding upward.
[0138]
The second transport mechanism 410 intermittently circulates a plurality of second transport members 408, and a second transport chain 418 is stretched around four sprockets 416 arranged at the transport path corners of the third transport path 400. It is in a state of being arranged in a rectangular shape. The second transport chain 418 is guided by a second transport rail 420 arranged along the transport path of the third transport path 400. Further, the second conveying chain 418 is connected to the second conveying member 408 through the bracket 414 at a blow molding pitch of every four pieces.
[0139]
Further, an intermittent conveyance motor (not shown) is connected to one of the four sprockets 416, and the four second conveyance members 408 are intermittently conveyed by the intermittent conveyance motor.
[0140]
The receiving unit 402 is connected to the third transport path 400Third delivery unit 32Provided on the short side arranged on the side,Third delivery unit 32Will receive 4 preforms 36 fromThird delivery unit 32The four second conveying members 408 are intermittently stopped at positions corresponding to the second gripping members 306 in FIG.
[0141]
The blow molding unit 404 is provided on the long side on the downstream side in the transport direction of the third transport path 400 and performs stretch blow molding on the preform 36 received by the receiving unit to mold a container. A stretch blow molding device 422 for performing stretch blow molding simultaneously on the received four preforms 36 is installed. This stretch blow molding device 422 opens and closes the mold in a direction intersecting the transport direction of the third transport path 400 in the blow molding section 404, and the mold clamping mechanism 424 is installed in the space between the long sides. Yes.
[0142]
In addition, a standby unit 426 for the preform 36 for one blow molding is provided between the receiving unit 402 and the stretch blow molding device 422 of the blow molding unit 404. During the standby in the standby unit 426, the heating station 30 is provided. The temperature of the preform 36 heated in step 1 is relaxed, and a temperature control section for a flat container can be provided in the standby section 426.
[0143]
The stop position of the second transport member 408 of the receiving section 402 is slightly shifted from the center position of the extraction section so that the preform 36 of the standby section 426 does not stop at the corner section of the third transport path 400. I am trying to set it.
[0144]
The take-out unit 406 is provided on the other short side facing the receiving unit 402 and takes out the container 428 formed by the stretch blow molding device 422 of the blow-molding unit 404, and is conveyed to the position of the take-out unit 406. A take-out device 430 for taking out the individual containers 428 is installed facing the third transport path 400 at the take-out position.
[0145]
As shown in FIG. 11, this take-out device 430 is substantially the same mechanism as the reverse delivery mechanism 126 in the supply unit 110, and four third gripping members 432 disposed at positions facing the neck portion of the container 428. A third opening / closing mechanism 436 having an opening / closing cylinder 434 for opening / closing the third gripping member 432, a second reversing mechanism 440 having a reversing actuator 438 for reversing the third gripping member 432, the third opening / closing mechanism 436, and the third A third elevating mechanism 444 having an elevating cylinder 442 that elevates and lowers the third gripping member 432 together with the 2 reversing mechanism 440 and an advance / retreat mechanism 448 having an advance / retreat cylinder 446 are provided.
[0146]
And it waits in the state which retracted from the 3rd conveyance path 400 of the extraction part 406 by the advancing / retreating cylinder 446, and the 3rd holding member 432 was opened toward the 3rd conveyance path 400. When the conveyance of the container 428 is stopped by the third conveyance path 400, the third gripping member 432 is advanced by the advance / retreat cylinder 446 and is closed by the opening / closing cylinder 434, and the neck portion of the container 428 is gripped. In this state, the third gripping member 432 is raised by the lifting cylinder 442, and the neck portion of the container 428 is detached from the second conveying member 408. Next, the third gripping member 432 is moved backward by the advance / retreat cylinder 446, the lifting cylinder 442 is lowered, the third gripping member 432 is reversed by the reversing actuator 438, and the third gripping member 432 is opened by the opening / closing cylinder 434 at that position. The neck portion of 428 is opened and dropped and taken out.
[0147]
Further, in the blow molding station 34, as shown in FIG. 1, a plurality of bases are provided on the machine base 450. Among these bases, the base located on the take-out portion 106 side is used as the base on the fixed side. On the other hand, it is formed as a movable base 452 that is movable along the long side direction of the third conveyance path 400, and two sprockets 416 of the second conveyance mechanism 410 are attached to the movable base 452.
[0148]
The movable base 452 is provided with a tension applying mechanism 454 that urges the movable base 452 in a direction in which the short sides of the third transport path 400 are separated from each other to apply tension to the second transport chain 418.
[0149]
The take-out device 430 is provided on the movable base 452, and is integrated with the movable base 452, so that it is not necessary to align the take-out device 430 after tension adjustment.
[0150]
Next, an injection blow molding method using the above-described injection blow molding apparatus 20 will be described.
[0151]
In the injection molding process, at the injection molding station 22, first, the upper mold clamping plate 50 of the injection molding apparatus 42 is lowered through the tie rod 48 by driving a mold clamping drive cylinder (not shown), and the neck mold is placed on the injection cavity mold 54. The fixing plate 64, the stripper plate 66, the injection core mold fixing plate 58, and the injection core mold holding plate 60 are overlapped, and the injection cavity mold 54, the injection core mold 56, and the neck cavity mold 62 are closed. By injecting the resin into the cavity of the injection cavity mold 54, two rows of eight preforms in the direction B perpendicular to the conveying direction A of the preform 36 are injection-molded simultaneously.
[0152]
Next, after the injection-molded preform 36 is cooled for a predetermined time, the upper mold clamping plate 50 is raised by a mold clamping drive cylinder (not shown) to release the preform 36 from the injection cavity mold 54.
[0153]
Next, the hydraulic release cylinder 78 is driven to bring the lower end of the release rod 80 into contact with the contact portion 82 of the stripper plate 66, and the stripper plate 66 is slightly lowered with respect to the injection core mold fixing plate 58. A gap is formed between the inner surface of the preform 36 and the injection core mold 56, and the preform 36 is released from the injection core mold 56 while the neck cavity mold 62 holds the neck portion of the preform 36.
[0154]
Next, with the preform 36 released from the injection core mold 56, the stripper plate lifting cylinder 72 is driven to lower the lower end of the stripper plate lifting rod to lower the stripper plate 66.
[0155]
In this case, the stripper plate 66 is reliably stopped at the lowering lower limit position where the preform 36 is not completely removed by the stopper rod.
[0156]
Next, at this lowering lower limit position, the neck type opening cylinder 94 is driven to lower the neck type opening cam, and the neck type fixing plate guide rail 68 is inserted into a wedge hole formed on the upper surface of the neck type fixing plate guide rail 68. When opened, the neck mold fixing plate 64 opens the neck cavity mold 62, and the neck portion of the preform 36 is released from the neck cavity mold 62 at that position and dropped and taken out.
[0157]
At this time, since the injection core mold 56 remains in the preform 36, it is regulated by the injection core mold 56, and the preform 36 can be dropped at a substantially central position.
[0158]
In the first delivery process, the firstDelivery section24, when the second extraction cylinder rod of the second extraction cylinder 132 is extended from the state in which the extraction plates 106a and 106b have narrowed the pitch on the cooling station 26 side, the second extraction cylinder fixing plate 136 and the first extraction guide rail are attached. When the first take-out guide rail 142 is moved to the injection molding station 22 side along the first guide member 144 via the plate 138 and the first take-out cylinder rod 124 of the first take-out cylinder 122 is extended, the take-out plate 106b is moved between the rows. The maximum pitch is regulated by the stopper 126 that moves in the direction of widening the pitch and connects the extraction plates 106a and 106b, and reaches the second extraction guide rail 128 to a position corresponding to the pitch between the rows of the preforms 36 in the injection molding station 22. The pitch between rows will be widened along.
[0159]
In this state, when the stripper plate 66 is lowered at the injection molding station 22, the neck cavity mold 62 is opened and the preform 36 is dropped, the preform 36 is supported by the preform support plates of the extraction plates 106a and 106b. Will be.
[0160]
Next, the first take-out cylinder rod 124 of the first take-out cylinder 122 is contracted to narrow the pitch of the take-out plates 106a and 106b, and the second take-out cylinder rod 134 of the second take-out cylinder 132 is contracted to reduce the take-out plates 106a and 106b. When the receiving plate 104 is moved to the upper side of the receiving mechanism 104 on the cooling station 26 side and the pressing plate 120 is pressed against the opposing ends of the opening / closing rods 116a and 116b by the take-off plate opening / closing cylinder 118, the preform supporting plates are opened and the preform 36 is opened. Open and transfer to the receiving mechanism 104 side.
[0161]
In the receiving mechanism 104, the receiving plates 146 a, 146 b, 146 c, and 146 d move the distance H by the upward drive of the first elevating cylinder 156 while the receiving plates 146 a and 146 b are at the standby position D, and the preform 36 It is arranged at a position directly below the extraction plates 106a and 106b, which is a receiving position.
[0162]
In this state, when the preform support plates of the extraction plates 106a and 106b are opened, the preform 36 falls, and the preform 36 is inserted into the holes of the receiving plates 146a and 146b, and is provided at the lower portion of the neck portion. The flange portion is supported by the preform support plate.
[0163]
Next, in the state where the receiving plates 146a and 146b are lowered to the delivery position E through the standby position D by the first elevating cylinder 156 and the second elevating cylinder 158, the receiving plate opening / closing cylinder 162 presses the opening / closing rod to push it. By opening the reforming support plate, the preform 36 is dropped from the receiving plates 146a and 146b and delivered to the cooling station 26.
[0164]
In the cooling station 26, the eight preforms 36 in one row are supported upright by the transport belt 176, and then the second preform 36 from the injection molding station 22 side along the first transport path 166.Delivery sectionIn the state where the pitch narrower than the pitch at the time of injection molding is maintained toward the side 28, the air is cooled by the blowing means while being intermittently conveyed.
[0165]
The centering core lifting mechanism 184 lowers the centering core and inserts it into the mouth of the preform 36 with respect to the eight rows of preforms 36 that are intermittently conveyed to the position corresponding to the centering core 182 and stopped. , Align one row of preforms 36.
[0166]
When the centering core 182 of the column correction mechanism 168 is inserted into the mouth of the preform 36 to perform column correction, the gate cutter lifting mechanism 188 raises the gate cutter 186 to perform the preform 36 from below the preform 36. Cut off the bottom gate.
[0167]
In the state where the row-corrected preform 36 is intermittently conveyed to the final end position of the first conveyance path 166 and stopped, the vertical movement cylinder lowers the front end portion of the extrusion cylinder 192 and moves the extrusion plate 190 to the final end position. In this state, the extrusion plate 190 is pushed forward by the extrusion cylinder 192, so that the first row of preform 36 is moved to the second position.Delivery sectionMove to 28.
[0168]
In the second delivery step, the pitch conversion mechanism 264 receives the preform 36 and guides it to both sides every four pieces by the guide members 270 each having four guide grooves 268. The pitch is set to 1/2 of the pitch at the time of blow molding.
[0169]
Then, one of the receiving members 272 is opened with the first gripping member 282 open with respect to the preform 36 held by each receiving member 272 converted into the pitch by the pitch converting mechanism 264 and positioned at the delivery position. The first holding member 282 is positioned on the side of the neck portion of the preform 36 held by the holding portion 274. In this state, the first holding member 282 is closed by the opening / closing cylinder 284 to hold the neck portion.
[0170]
Next, the first gripping member 282 is reversed from the cooling station 26 side to the heating station 30 side by the reversing actuator 288, and the preform 36 is inverted.
[0171]
Then, when the first gripping member 282 is lowered by the lifting mechanism and the first gripping member 282 is opened by the opening / closing cylinder 284, the neck portion of the preform 36 is released and transferred to the heating station 30 in an inverted state. It becomes.
[0172]
Next, with the movement mechanism moving the receiving member 272 by a distance corresponding to the interval between the holding portions 274 and moving the remaining preform 36 to the position corresponding to the first gripping member 282, the remaining preform 36 is moved. It is supposed to be handed over.
[0173]
In the heating process, for the two first conveying members 206 arranged side by side in the two second conveying paths 200 provided in parallel in the conveying direction A of the preform 36 at the two heating stations 30, respectively. Each of the four preforms 36 is delivered from the reverse delivery mechanism 266. The preform 36 transferred to the first transport member 206 is intermittently transported by the first transport mechanism 208 that transports the first transport member 206, and the first rotation chain 250 and the second self-rotation chain 204 of the rotation mechanism 204 are transported. The first transport member is rotated by the diversion chain 252 through the rotation sprocket 216 while being rotated by the heating box 202 provided in the middle of each second conveyance path 200, and the thirdDelivery sectionIt is conveyed to 32 positions and heated to an appropriate temperature for blow molding.
[0174]
In this case, since the preform 36 is rotated by the rotation mechanism 204, the preform 36 is uniformly heated in the circumferential direction.
[0175]
In each second conveying path 200, the preform 36 is heated while being conveyed in an inverted state by the first conveying member 206, so that the heat at the time of heating heats the neck portion of the preform 36 and the first conveying member 206 more than necessary. Without adversely affecting the neck portion and the first conveying member 206 during heating.
[0176]
Further, in each of the second conveyance paths 200, an interval for one preform 36 is provided between the upstream heating box 202 and the downstream heating box 202, and the heating is rested at this position. The temperature difference between the inner and outer surfaces of the preform 36 heated by the upstream heating box 202 can be relaxed and supplied to the downstream heating box 202.
[0177]
In addition, as shown in FIG. 8, cooling air is supplied to each heating box 202 by a blower 248, thereby extending the life of the reflector 240, cooling the terminal block 240, and cooling both ends of the heater 238. It is possible to extend the life of the heater. Furthermore, a plurality of stages of heaters 238 in each heating box 202 can be moved back and forth with respect to the preform 36, and the axial temperature distribution of the preform 36 can be easily adjusted by adjusting the front and back positions. can do.
[0178]
In the third delivery step, as shown in FIGS. 5, 7, 9, and 10, the height of the neck portion of the preform 36 in which the four sets of second gripping members 306 are conveyed by the second conveyance path 200. At the position, the vehicle is waiting in a state of opening toward the second conveyance path 200. When the preform 36 is intermittently conveyed to the transfer take-out position by the first conveying member 200 and stopped, the second opening / closing mechanism 308 closes the second gripping member 306 via the pair of transfer arms 314 a and 314 b, and the neck of the preform 36. Grip the part.
[0179]
In this state, when the second gripping member 306 is raised by the distance X by the second lifting mechanism 312, the neck portion of the preform 36 is extracted from the first transport member 206 of the second transport path 200.
[0180]
Next, when the rotating shaft 318a is rotated by the transfer actuator 332 of the moving mechanism 310, the rotating shaft 318b rotates together with the rotating shaft 318a via the tooth portion 334 and the sprocket 336. The transfer arms 314a and 314b attached to the rotary shafts 318a and 318b rotate and move between the heating station 30 and the blow molding station 34 in the same manner as the parallel link, and the second gripping member 306 is moved. Move up and down. As a result, the preform 36 conveyed by the second conveyance path 200 in the inverted state is transferred to the blow molding station 34 in the inverted state.
[0181]
At the time of this transfer, the transfer mechanism bases 304 are slid toward each other by the pitch changing cylinder 346 of the pitch changing mechanism 302 to change the pitch of the preform 36 to the blow molding pitch at the blow molding station 34.
[0182]
Then, in a state where the second conveying member 408 is intermittently conveyed along the third conveying path 400 to the receiving unit 402 of the blow molding station 34 and is stopped, the second holding member 306 is lowered by the second elevating mechanism 312. By opening the second gripping member 306 by the two opening / closing mechanism 308, the preform 36 is delivered to the second conveying member 408 of the blow molding station 34. Further, from this state, the second gripping member 306 is lifted by the second lifting mechanism 312 and retracted from the third transport path 400, whereby the preform 36 can be transported by the third transport path 400.
[0183]
In the blow molding process, as shown in FIG. 1 and FIG.Delivery sectionThe four preforms 36 are supported by the second transport chain 418 of the second transport mechanism 410 while the neck portions of the four preforms 36 in the inverted state received from the transfer mechanism 300 in 402 are supported by the second transport member 408. It is conveyed intermittently,Delivery sectionA standby unit 426 provided between 402 and the blow molding unit 404 is on standby, and during this standby, the temperature of the preform 36 heated by the heating station 30 is relaxed.
[0184]
Next, the four preforms 36 whose temperature has been relaxed by the standby unit 426 are intermittently conveyed, stopped at the position of the stretch blow molding device 422 of the blow molding unit 404, and clamped by the mold clamping mechanism 424 or the like. The four preforms 36 heated simultaneously by the heating station 30 are stretch blow molded to form a container 428.
[0185]
In this case, since the simultaneously heated preform 36 is simultaneously blow-molded, it is possible to prevent the occurrence of molding quality unevenness during blow molding.
[0186]
Then, the container 428 blow-molded by the stretch blow molding device 422 is intermittently conveyed to the position of the take-out device 430 of the take-out portion 406 and stopped.
[0187]
The take-out device 430 waits in a state where the third gripping member 432 is opened toward the third conveyance path 400 while being retracted from the third conveyance path 400 by the advance / retreat cylinder 446 of the advance / retreat mechanism 448. When the conveyance of the container 428 is stopped by the third conveyance path 400, the third gripping member 432 is advanced by the advance / retreat cylinder 446 and is closed by the open / close cylinder 434, and the neck portion of the container 428 is gripped. In this state, the third gripping member 432 is raised by the lifting cylinder 442, and the neck portion of the container 428 is detached from the second transport member 408. Next, the third gripping member 432 is retracted by the advance / retreat cylinder 446 and the elevating cylinder 442 is lowered. Thereafter, when the third gripping member 432 is reversed by the reversing actuator 438 and the third gripping member 432 is opened by the opening / closing cylinder 434 at that position, the neck portion of the container 428 is opened and dropped and taken out. Since the take-out device 430 is provided on the movable base 452 that is movable to apply tension to the second transport chain 418, the position of the take-out device 430 with respect to the second transport member 408 after the tension adjustment. There is no need to match.
[0188]
12-14 is a figure which shows other embodiment of the transfer part which delivers a preform from the heating station of this invention to a blow molding station.
[0189]
The transfer unit 500 according to this embodiment includes a transfer mechanism 502 that transfers the four preforms 36 heated in the heating station 30 to the blow molding station 34 in an inverted state, and two first ones of the heating station 30. A pitch change mechanism 504 that converts the pitch between the preforms 36 inside each first conveyance path 200 to the blow molding pitch in the blow molding station 34 while maintaining the pitch between the preforms 36 in the conveyance path 200 is provided.
[0190]
The transfer mechanism 502 and the pitch changing mechanism 504 are attached to a frame 508 supported above the transfer unit region by a support column 506.
[0191]
The transfer mechanism 502 includes a gripping member 510 that grips the neck portion of the preform 36, a gripping member opening / closing mechanism 512 that opens and closes the gripping member 510 to grip and release the preform 36, and can lift the gripping member 510. And a moving mechanism 516 that moves the gripping member 510 from a gripping position on the heating station 30 side to a receiving position on the blow molding station 34 side.
[0192]
The gripping member 510 is composed of a pair of gripping arms 510a and 510b arranged to face each other so as to grip the neck portion of the preform 36. Two gripping members 510 are arranged corresponding to the positions of the preforms 36 conveyed by the two first conveyance paths 200. Each of these gripping members 510 is provided with a pair of gripping arms 510a and 510b extending in the vertical direction so that the lower end portion thereof can grip the neck portion of the preform 36.
[0193]
A pair of gripping member opening / closing mechanisms 512 is provided so as to be able to open and close two sets of gripping members 510 corresponding to the preforms 36 transported by the respective first transport paths 200.
[0194]
Each gripping member opening and closing mechanism 512 opens and closes the gripping arms 510a and 510b of each gripping member 510 to grip and release the preform 36. A pair of slide rods 518a and 518b arranged in parallel vertically, A holding member opening / closing cylinder 520.
[0195]
One slide rod 518a is attached and fixed to one gripping arm 510a and slidably penetrates the other gripping arm 510b. The other slide rod 518b is slidably penetrated through one gripping arm 510a, and the other gripping arm 510b is attached and fixed. In addition, the pair of slide rods 518 a and 518 b have rack portions 522 formed at opposite positions near the end portions, and a pinion 524 is engaged between the rack portions 522.
[0196]
The gripping member opening / closing cylinder 520 is connected to one slide rod 518 a, and slides one slide rod 518 a and slides the other slide rod 518 b in the opposite direction via the pinion 524, thereby holding the grip arm of the gripping member 510. 510a and 510b are opened and closed.
[0197]
The lifting mechanism 514 lifts and lowers the gripping member 510 to take out and pass the preform 36. The lifting mechanism 514 supports the gripping member opening / closing mechanism 512 so as to be liftable, and the lifting bracket 526 is provided with a lifting rod 528. A lifting cylinder 530 connected thereto is provided, and the gripping member 510 can be lifted and lowered as the gripping member opening / closing mechanism 512 is lifted and lowered.
[0198]
The moving mechanism 516 moves the gripping member 510 from the preform 36 take-out position of the heating station 30 to the delivery position to the blow molding station 34. The rodless cylinder 532, the moving guide rod 534, the moving member 536, An approaching / separating movement guide rod 538 and an approaching / separating movement member 540 are provided.
[0199]
The rodless cylinder 532 is disposed along the conveyance direction A of the preform 36 at a substantially central position of the frame 508.
[0200]
A pair of moving guide rods 534 are arranged in parallel on both side positions of the rodless cylinder 532.
[0201]
The moving member 536 is connected to the rodless cylinder 532 and is slidably engaged with the moving guide rod 534 so as to be movable in the conveying direction A of the preform 36.
[0202]
The contact / separation moving guide rod 538 is disposed in a direction B perpendicular to the conveying direction A of the preform 36, and is attached to the moving member 536 near the center so as to be movable in the conveying direction A of the preform 36. Yes.
[0203]
The contact / separation moving member 540 is slidably supported with respect to the contact / separation movement guide rod 538 as a pair on both sides of the contact / separation movement guide rod 538 with the movement guide rod 534 interposed therebetween.
[0204]
The lift cylinder 530 is attached to and supported by the contact / separation moving member 540.
[0205]
Therefore, when the moving member 536 is moved along the moving guide rod 534 in the conveying direction A by the rodless cylinder 532, the lifting mechanism is moved via the contacting / separating moving guide rod 538 and the pair of contacting / separating moving members 540. 514 also moves, and the two gripping members 510 connected to the lifting mechanism 514 via the gripping member opening / closing mechanism 512 move in the conveying direction A of the preform 36 on both sides of the moving guide rod 534, respectively. It becomes.
[0206]
The pitch changing mechanism 504 includes a pair of pitch changing guide rods 542 disposed on the outer side of the moving guide rod 534 so that the width decreases from the heating station 30 side to the blow molding station 34 side. Each pitch changing guide rod 542 is connected to the contact / separation moving member 540 via the bracket 544 so that the contact / separation moving member 540 can move along the pitch changing guide rod 542.
[0207]
When the contact / separation moving guide rod 538 moves as the moving member 536 moves in the conveyance direction A of the preform 36, each contact / separation moving member 540 moves in a state of being guided by the pitch changing guide rod 542. Then, each contact / separation moving member 540 gradually slides on the contact / separation movement guide rod 538 and moves in the proximity direction, and when the gripping member 510 reaches the receiving position of the blow molding station 34, a pair of grips The pitch between the inner gripping members 510 attached to the member opening / closing mechanism 512 is set to the pitch at the time of blow molding.
[0208]
Next, when transferring the preform 36 in such a transfer unit 500, first, each gripping member 510 is positioned on the preform 36 take-out side of the heating station 30, and the gripping member 510 is held by the lifting mechanism 514. Until the gripping member 510 is opened by the gripping member opening / closing mechanism 512.
[0209]
Next, at the heating station 30, when the preform 36 heated in the inverted state is transported to the receiving position and stopped, the gripping member 510 is closed by the gripping member opening / closing mechanism 512, and the neck portion of the preform 36 is gripped. After that, the gripping member 510 is raised by the lifting mechanism 514, and the neck portion of the preform 36 is extracted from the first transport member 206.
[0210]
Next, when the moving member 536 is moved in the transport direction A of the preform 36 along the moving guide rod 534 by the rodless cylinder 532, the moving rod 532 moves through the contacting / separating moving guide rod 538 and the pair of contacting / separating moving members 540. The lifting mechanism 514 also moves, and the two gripping members 510 connected to the lifting mechanism 514 via the gripping member opening / closing mechanism 512 move in the conveying direction A of the preform 36 on both sides of the moving guide rod 534. To do.
[0211]
As the moving member 536 moves in the conveyance direction A of the preform 36, the contact / separation moving guide rod 538 moves, and each contact / separation moving member 540 moves while being guided by the pitch changing guide rod 542. Then, each contact / separation moving member 540 gradually slides on the contact / separation movement guide rod 538 and moves in the proximity direction, and when the gripping member 510 reaches the receiving position of the blow molding station 34, a pair of gripping members The pitch between the inner gripping members 510 attached to the opening / closing mechanism 512 is the pitch at the time of blow molding.
[0212]
In this state, when the second conveying member 408 is intermittently conveyed along the second conveying path 400 to the receiving unit 402 of the blow molding station 34 and stopped, the gripping member 510 is lowered by the lifting mechanism 514, and the gripping member opening / closing mechanism By opening the gripping member 510 by 512, the preform 36 is delivered to the second conveying member 408 of the blow molding station 34.
[0213]
Further, from this state, the holding member 510 is lifted by the lifting mechanism 514 and retracted from the second transport path, so that the preform 36 can be transported by the second transport path 408.
[0214]
Then, when the moving member 536 is moved to the heating station 30 side by the rodless cylinder 532 and the gripping member 510 is lowered by the elevating mechanism 514, the next extraction standby state is entered.
[0215]
The present invention is not limited to the above-described embodiment, and can be changed to various embodiments within the scope of the gist of the present invention.
[0216]
For example, in the above-described embodiment, two rows of eight preforms are simultaneously injection-molded at the injection molding station, but the number of one row and the number of simultaneous moldings can be changed as appropriate.
[0217]
Four preforms are supplied from the cooling station to the heating station, and third from the heating station to the blow molding station.Delivery sectionHowever, the present invention is not limited to this example, and the number of preforms to be transported can be arbitrarily changed.
[0218]
[Brief description of the drawings]
FIG. 1 is a plan view showing an injection blow molding apparatus according to an embodiment of the present invention.
FIG. 2 is a side view of the injection molding station of FIG. 1 as viewed from the injection apparatus side.
FIG. 3 FirstDelivery sectionFIG.
4 is a first view of FIG.Delivery sectionFIG.
FIG. 5 is an enlarged plan view of a heating station and a transfer unit in FIG. 1;
6 is a plan view showing a preform rotation mechanism in the heating station of FIGS. 1 and 5. FIG.
FIG. 7 is a side view showing a part of FIG.
8 is a cross-sectional view showing a state of a heating box in the heating station of FIGS. 1 and 5. FIG.
9 is a cross-sectional view seen from the front showing a transfer mechanism of the transfer unit of FIG. 7;
FIG. 10 is a side view showing a preform transfer state by the transfer mechanism.
11 is a side view showing a state of the take-out part in the blow molding station of FIG. 1. FIG.
FIG. 12 is a plan view showing a state of a transfer unit from a heating station to a blow molding station according to another embodiment of the present invention.
13 is a partial front view showing a state of the gripping member of FIG. 12. FIG.
14 is a side view of FIG. 12. FIG.
[Explanation of symbols]
20 Injection blow molding equipment
22 Injection molding station
24 1stDelivery section
26 Cooling station
28 secondDelivery section
30 Heating station
32 3rdDelivery section
34 Blow molding station
36 preform
46 Lower mold clamping plate
50 Upper mold clamping plate
52 Injection mold equipment
54 Injection cavity mold
56 Injection core type
58 Injection core type fixed plate
60 Injection core type holding plate
62 Neck cavity type
64 neck fixed plate
66 Stripper plate
68 Neck type fixed plate guide rail
80 Release rod
102 Take-out mechanism
108 row pitch conversion mechanism
166 1st transport path
168 column correction mechanism
170 Gate cut mechanism
176 Conveyor belt
200 Second transport path
202 Heating box
204 Rotation mechanism
206 First conveying member
H.264 pitch conversion mechanism
266 Reverse delivery mechanism
270 Guide member
290 Inversion mechanism
300 Transfer mechanism
400 3rd transport path
402 Receiver
404 Blow molding part
406 Extraction section

Claims (8)

An injection molding station for injection-molding the preform, a first delivery unit for delivering the preform injection-molded at the injection molding station, and a cooling station for cooling the preform delivered from the first delivery unit; A second delivery unit for delivering the cooled preform, a heating station for heating the preform delivered from the second delivery unit, and a third for transferring the preform heated in the heating station. A delivery unit and a blow molding station that stretch-blow-molds the preform transferred from the third delivery unit to form a container are arranged linearly along the transport direction of the preform,
The injection molding station has an injection mold that simultaneously performs injection molding of a plurality of preforms in an upright state in the preform conveying direction in a direction perpendicular to the preform conveying direction,
The first delivery unit takes out the plurality of rows of preforms that have been injection-molded at the injection molding station, performs row pitch conversion to narrow the pitch between rows in the transport direction of the preform, and stands upright on the cooling station. Have a delivery mechanism
The cooling station has a plurality of first conveyance paths that intermittently convey the plurality of rows of preforms received from the first delivery unit to the second delivery unit in an upright state,
The second delivery unit distributes the two rows of preforms orthogonal to the conveying direction of the preforms cooled by the cooling station into two hands, and converts the pitch between the preforms into the pitch at the time of blow molding. A mechanism and an inversion delivery mechanism for receiving and reversing the pitch-converted preform and delivering it to the heating station in an inverted state;
The heating station is arranged in parallel from the second delivery unit to the third delivery unit, each of which receives the preform and intermittently conveys the preform in an inverted state; A heating box disposed along the second conveyance path, and at least a rotation mechanism for rotating the preform in the heating box;
The third delivery unit has a transfer mechanism for delivering the preform in an inverted state heated and conveyed by the second conveyance path to the blow molding station in an inverted state,
The blow molding station receives, in an inverted state, a plurality of preforms from the third delivery section on a substantially rectangular third conveyance path having a short side and a long side and one side of the short side of the third conveyance path. A receiving part, a blow molding part that is provided on one side of the long side of the third conveying path and that simultaneously performs stretch blow molding on a plurality of preforms received by the receiving part, and forms a container; and the receiving part; An injection blow molding apparatus comprising: a take-out portion for taking out a container formed by the blow molding portion provided on another opposing short side. An injection molding station for simultaneously injection-molding a plurality of first number of preforms in the preform transport direction in a direction perpendicular to the preform transport direction;
A delivery unit that takes out the plurality of preforms that have been injection-molded at the injection molding station, and performs a column pitch conversion for narrowing the pitch between columns in the transport direction of the preform;
A cooling station that intermittently conveys and cools the preform received from the delivery unit in the conveyance direction of the preform;
A heating station that heats and conveys the preform cooled by the cooling station for each second number of preforms less than the first number;
An injection blow molding apparatus comprising: a blow molding station that stretches and blow-molds each second number of preforms heated in the heating station to form a container. In claim 2,
Before Kihiya retirement station injection blow molding apparatus characterized by cooling by conveying the preforms of said first number of injection molded at the injection molding station. An injection molding station for simultaneously injection-molding a plurality of first number of preforms in the preform transport direction in a direction perpendicular to the preform transport direction;
A first delivery unit that takes out the plurality of preforms that have been injection-molded at the injection molding station, and performs delivery by performing row pitch conversion that narrows the pitch between rows in the transport direction of the preform;
A cooling station for intermittently transporting and cooling the plurality of rows of preforms received from the first delivery unit in the transport direction of the preforms;
A heating station that heats and conveys a second number of preforms less than the first number cooled in the cooling station;
An injection blow molding apparatus, comprising: a blow molding station that simultaneously stretch-blow-molds a second number of preforms heated simultaneously in the heating station to mold a container. In claim 4,
A second delivery section that transforms the first number of preforms in the row cooled by the cooling station to the heating station by converting the pitch between the preforms into the pitch at the time of blow molding. Have
The injection blow molding apparatus, wherein the heating station transports and heats the second number of the preforms delivered from the second delivery unit through a plurality of second conveyance paths. In claim 5,
The second delivery unit distributes the first number of preforms to a plurality of the second conveyance path sides, and sets the pitch between the preforms at the positions corresponding to the second conveyance paths at the time of the stretch blow molding. A pitch conversion mechanism that converts the pitch into half of the pitch of the pitch and a delivery mechanism that takes out every other preform from the number of preforms subjected to the pitch conversion and delivers them to each second transport path. Injection blow molding equipment. In claim 6,
The pitch conversion of the preform in the pitch conversion mechanism is performed by a guide member that slides along a plurality of guide grooves that suspend and support the preform and changes the pitch as it moves. . A step of simultaneously injection-molding a plurality of preforms in a row in a direction orthogonal to the conveying direction of the preform in an injection mold;
Transporting the plurality of preforms while maintaining a pitch between the preforms in a direction perpendicular to the transport direction of the preforms, and cooling the preforms;
A step of transporting and heating a smaller number of preforms than the plurality of cooled preforms in a direction perpendicular to the transport direction of the preforms, and a plurality of preforms heated in the heating step In a state along the conveying direction in series conveyance and stretch blow molding,
An injection blow molding method comprising:

Images