JP4864049B2 - Clamping mechanism of biaxial stretch blow molding machine - Google Patents

Description

  In the present invention, a preform carrier carrying a preform is transported along a transport path passing through a heating unit and a stretch molding unit, so that the preform is biaxially stretch blow molded into a molded product having a predetermined shape. The present invention relates to a biaxial stretch blow molding machine. More specifically, the present invention relates to a mold clamping mechanism for opening and closing a pair of stretch molds arranged in a stretch molding section of such a biaxial stretch blow molding machine.

  A biaxial stretch blow molding machine that manufactures resin molded products such as PET bottles by biaxial stretch blow molding heats a primary molded product called a preform to a temperature suitable for molding while being conveyed through a heating unit. Next, the preform is subjected to biaxial stretch blow molding in the stretch molding die constituting the stretch molding portion.

  A typical biaxial stretch blow molding machine includes a preform supply unit, a preform heating unit, a stretch molding unit, and a molded product take-out unit, and a large number of them are arranged along a guide rail that defines a conveyance path passing through these parts. The preform carrier is continuously or intermittently circulated. Further, a typical preform carrier has a structure including a slide portion that is guided by a guide rail and moves along the guide rail, and a preform insertion core portion that protrudes from the slide portion. .

  Preforms are loaded onto each preform carrier so that the mouths of the preforms are attached to the core of the preform carrier one by one in the preform supply unit. In addition, the molded product obtained by biaxially stretching blow-molding the preform in the stretch-molded part is obtained by extracting the neck opening from the core part of each preform carrier in the molded product take-out part. Unloaded from the carrier and collected at a predetermined collection location. Further, each preform carrier that has been unloaded from the molded product is returned to the preform supply unit, and the preform is loaded.

  In the biaxial stretch blow molding machine having a structure in which the preform is carried by the preform carrier continuously conveyed along a certain circulation path and biaxial stretch blow molding is performed, the operation speed of each part is set. Increasing and improving the overall processing capacity is strongly desired to increase economic efficiency.

  In addition, the preform carrier in which the molded product is unloaded after passing through the stretch molding section generally returns to the preform supply section by bypassing the stretch molding section. By forming a detour that passes through the dead space below the stretch-formed part, the circulation path can be made compact. In this case, since the height of the circulation path can be changed, it is necessary to transfer the preform, the molded product, and the preform carrier between the transport paths having the height difference. If the delivery operation can be made more efficient, the processing speed of the biaxial stretch blow molding machine can be increased.

  Next, the preform conveyed by the preform carrier along the circulation path is formed into a molded product having a large width and height in the stretch molding unit. For this reason, it is necessary to widen the feed pitch of the preform carrier before the stretch-formed part. If such a feed pitch conversion operation and a preform carrier transport operation with a wide feed pitch can be performed efficiently, the processing speed of the biaxial stretch blow molding machine can be increased.

  On the other hand, a mold clamping mechanism for opening and closing a pair of stretch molds for performing preform stretch molding is generally configured such that each stretch mold supported in a slidable manner is respectively air cylinders via a toggle link mechanism. It has a structure that opens and closes. If the opening and closing operation of the stretching mold by the mold clamping mechanism can be performed efficiently, the processing speed of the biaxial stretching machine can be increased.

  Furthermore, the subject of this invention is enabling it to perform efficiently the operation | movement of the clamping mechanism of a pair of extending | stretching shaping | molding die for performing biaxial stretching blow molding in a biaxial stretching blow molding machine.

In order to solve the above problems, the present invention provides:
A mold clamping mechanism for opening and closing a pair of stretch molds in a biaxial stretch blow molding machine,
A first toggle link mechanism for moving one of the pair of stretch molds to an open position and a closed position;
A second toggle link mechanism for moving the other of the pair of stretching molds to an open position and a closed position;
It is characterized in that it has a rocking mechanism for reciprocally moving in synchronization with each link connecting points in the first and second toggle link mechanism upside down direction.

The swing mechanism is
A swinging member disposed at a position below the first and second toggle link mechanisms so as to be swingable in a vertical direction around a predetermined swing center ;
A first end and a second end located at a position symmetrical with respect to the swing center of the swing member, respectively, connected to each link connecting points of the first and second toggle link mechanism First and second connecting members extending in the vertical direction ,
A mold opening / closing cylinder that swings the swinging member in the vertical direction about the swinging center is provided.

  In the mold clamping mechanism of this configuration, the mold opening operation and the mold clamping operation of the pair of stretch molding dies are performed in complete synchronization, and therefore these operations can be performed efficiently. In addition, the first and second toggle link mechanisms move in the opposite directions, and the load acting during mold clamping and mold opening acts at a point-symmetrical position with respect to the oscillation center in the oscillation mechanism. An offset load does not act at the time of clamping and mold opening, and an impact force does not act. Therefore, these operations can be performed smoothly. In this manner, the mold clamping and mold opening operations can be performed smoothly and quickly, and as a result, the processing speed of the biaxial stretch blow molding machine can be increased.

Next, according to the present invention, the preform is biaxially stretched and molded into a predetermined shape by transporting a preform carrier carrying the preform along a transport path passing through the heating section and the stretch molding section. In the biaxial stretch blow molding machine
The stretch molding part has a pair of stretch molds and a clamping mechanism for opening and closing these stretch molds,
The mold clamping mechanism is a mold clamping mechanism having the above configuration.

  In the biaxial stretch blow molding machine of the present invention, the first and second toggle link mechanisms that move in the opposite direction and the swing mechanism that moves them in complete synchronization are used as the mold clamping mechanism of the stretch mold. The thing of the composition with which it was equipped is adopted. According to this configuration, it is possible to efficiently perform mold clamping and mold opening operations, and it is possible to avoid the application of an offset load or impact force during these operations, so that the operation of the mold clamping mechanism can be performed efficiently. It can be done smoothly.

  Below, with reference to drawings, the biaxial stretch blow molding machine for PET bottle manufacture to which the present invention is applied is explained.

(Overall configuration and operation)
1A and 1B are a plan view and a side view showing the overall configuration of the biaxial stretch blow molding machine of this example. Referring to these drawings, the biaxial stretch blow molding machine 1 has a horizontally long gantry frame 2, and a preform supply unit 3 is formed on the upper surface of the gantry frame 2 along the preform conveyance path. The preform heating units 4 (1) to 4 (5), the preform P stretch molding unit 5, and the molded product takeout unit 6 are arranged in this order.

  The preform supply unit 3 of the present example receives the preform carrier 7 conveyed in an inverted state where the molded product F is unloaded and is empty, and after the preform P is attached thereto, the preform carrier 7 is inverted. It is set in an upright state, and thereafter, it is handed over to a pair of guide rails 8 (1) that define a transport path at a position one level higher. Accordingly, the first inversion means is provided.

  The preform carrier 7 delivered to the pair of guide rails 8 (1) is sequentially pushed forward along the guide rails 8 (1) and passes through the heating units 4 (1) to 4 (5). Delivered to the transport path 8 (2). The transport path 8 (2) includes a transport belt 83 that extends between the driving pulley 81 and the driven pulley 82, and a plurality of transport belts 8 that are attached to the transport belt 83 at a predetermined interval and circulate together with the transport belt 83. The preform carrier transfer tool 84 is provided. One linear conveyance path portion defined by the conveyance belt 83 passes through a heating portion by the heating units 4 (1) and 4 (2), and the preform conveyed by the transfer tool 84 is passed through this portion. A drive mechanism 85 for rotating the preform P carried on the carrier 7 is provided. Similarly, the other straight conveyance path part prescribed | regulated by the conveyance belt 83 has passed the heating part by the heating parts 4 (3) -4 (5), and is conveyed by the transfer tool 84 to this part. A drive mechanism 86 for rotating the preform P carried on the preform carrier 7 is provided.

  The preform carrier 7 delivered from the pair of guide rails 8 (1) to each transfer tool 84 in the transport path 8 (2) is sequentially heated by the heating units 4 (1) to 4 (5) by each transfer tool 84. To pass through. Further, while passing through these heated portions, the preform P carried on the preform carrier 7 is rotated by the drive mechanisms 85 and 86, so that the outer peripheral surface of each preform P is uniformly heated.

  The preform carrier 7 carrying the preform P heated to a temperature suitable for molding via the heating units 4 (1) to 4 (5) is an upper conveyance path defined by a pair of guide rails 8 (3). To be handed over. This guide rail 8 (3) extends through the stretch molding part 5. The stretch molding unit 5 includes a pair of left and right stretch molds 51 and 52 centered on a preform conveyance path defined by the guide rail 8 (3). The stretch molds 51 and 52 are separated by a mold clamping mechanism 53. Opened and closed.

  A feed pitch enlarging mechanism 9 is disposed on the front side of the stretch molding unit 5 in the preform conveyance direction. The preform carrier 7 that has been continuously conveyed along the guide rail 8 (3) toward the stretch molding unit 5 has its feed pitch adjusted to a feed pitch suitable for the molded product F by the feed pitch expanding mechanism 9. Can be spread.

  Thereafter, the preform P carried on the preform carrier 7 is fed to the stretch molding position of the stretch molding unit 5 by the transport mechanism 10 while maintaining a wide feed pitch. The preform P is biaxially stretch blow-molded in the stretch-molding unit 5 to form a PET bottle (molded product) F having a predetermined shape. The preform carrier 7 carrying the PET bottle F, which is a molded product, is fed from the stretch molding unit 5 along the guide rail 8 (3) by the transport mechanism 10 while maintaining a wide feed pitch. Further, the transfer mechanism 10 delivers the molded product take-out portion 6 with a wide feed pitch.

  The molded product take-out unit 6 receives the preform carrier 7 carrying the PET bottle F from the guide rail 8 (3) and reverses it. Further, the PET bottle F, which is a molded product, is extracted from the preform carrier 7 which is inverted and inverted, and then a pair of guides horizontally disposed at a position lower than the guide rail 8 (3). The empty preform carrier 7 from which the molded product has been extracted is delivered to the lower conveyance path defined by the rail 8 (4) while being inverted.

  The molded product F pulled out from the preform carrier 7 is delivered to a molded product collection path 8 (6) extending in the direction opposite to the guide rail 8 (4), and collected by a collection unit (not shown). Thus, the molded product takeout part 6 includes the second reversing means.

  The guide rail 8 (4) extends to the preform supply unit 3 through a dead space below the pair of stretching molds 51 and 52 of the stretching unit 5, and the empty preform carrier 7 remains in an inverted state. Delivered to the preform supply unit 3. As described above, the preform supply unit 3 supports the preform on the preform carrier 7 received in the inverted state, and then reverses the preform carrier 7 to bring it upright. After that, it is handed over to a pair of guide rails 8 (1) defining a transport path that is one step higher than the guide rails 8 (4).

  Thereafter, the above steps are repeated, the preform is conveyed by each preform carrier 7, and the biaxial stretch blow molding is repeated.

(Preform, preform carrier, molded product)
FIG. 2 is a view showing the preform P, the preform carrier 7 and the molded product F. As shown in FIG. 2A, the preform P is a primary PET molded product having a test tube shape with one end having an opening P1, and an annular protrusion P2 is formed on the outer peripheral surface in the vicinity of the opening P1. .

  As shown in FIG. 2B, the preform carrier 7 has a cylindrical main body 71, and a large-diameter flange 72 is formed on the outer periphery of the cylindrical main body 71. One side portion of the flange 72 is an insertion core portion 73 that can be inserted into the mouth of the preform P, and an annular flange 74, an annular external gear 75, and an annular plate 76 are provided on the outer periphery of the other side portion. Are attached in this order and fixed so as not to come off by a retaining ring 77. The annular flange 74 has the largest diameter, and this portion functions as a slide portion that slides horizontally along a guide rail described later. Further, the cylindrical main body 71 inside the annular flange 74 is rotatable with respect to the annular flange 74, and an annular external gear 75 is fixed to the cylindrical main body 71 so as to rotate integrally. . Therefore, when the external gear 75 is rotationally driven by a timing belt or the like, the cylindrical main body 71 also rotates integrally, so that the preform P is conveyed while being inserted into the insertion core portion 73 formed at the tip thereof. Will also rotate.

  Next, FIG. 2C shows a molded product F obtained by performing biaxial stretch blow molding in the stretch molding section 5. The molded product F of this example is a PET bottle, and the outer peripheral surface of the neck F1 is provided with at least one annular protrusion, in this example, two annular protrusions F2 and F3.

(Guide rail)
FIG. 3 (A) shows guide rails 8 (1) and 8 (3) for conveying the carrier 7 in an upright state, and FIG. 3 (B) conveys the preform carrier 7 in an inverted state. A guide rail 8 (4) is shown. These figures also show the height relationship between the two guide rails at the same time. The guide rail 8 (4) is a lower guide rail, and the guide rails 8 (1) and 8 (3) are upper guide rails. It is a rail.

  The guide rails 8 (1) and (3) have a pair of left and right upper rail frames 801 and 802 and a pair of left and right lower rail frames 803 and 804. The upper rail frames 801 and 802 are horizontally arranged in parallel with a predetermined interval. Similarly, the lower rail frames 803 and 804 are horizontally arranged in parallel with a certain interval. The corresponding upper and lower rail frames 801 and 803 and the upper and lower rail frames 802 and 804 form guide grooves 805 and 806 in which the annular flange 74 of the preform carrier 7 can be slidably inserted from the lateral direction. These rail frames 801 to 804 are attached to attachment frames or attachment plates 807 and 808, and each attachment plate 807 and 808 is supported by the gantry frame 2 via a support frame (not shown).

  The other guide rail 8 (4) has a structure in which the guide rails 8 (1) and 8 (3) having the above-described configuration are inverted. Accordingly, corresponding parts are denoted by the same reference numerals, and description thereof is omitted. As described above, the guide rails 8 (1), (3), and (4) of this example have a structure capable of transporting the preform carrier 7 in the horizontal direction in a state where it cannot be pulled out vertically.

(Preform supply department)
As described above, the preform supply unit 3 of the present example has the preform carrier 7 conveyed along the lower guide rail 8 (4) in an inverted state in which the molded product F is unloaded and emptied. And, after the preform P is mounted thereto, it is turned upside down to be in an upright state, and then handed over to a pair of guide rails 8 (1) defining the transport path at the upper position. It is configured.

  4 to 7 are schematic configuration diagrams of the preform supply unit 3 viewed from the preform conveyance direction, schematic configuration diagrams viewed from a direction orthogonal to the preform conveyance direction, and a schematic diagram illustrating a portion of the lower conveyance path. It is a partial block diagram at the time of seeing from the top view and the arrow 6A of FIG.

  Referring to these drawings, the preform supply unit 3 is held in an inverted state by the carrier inversion mechanism 31 that inverts the inverted preform carrier 7 to an upright state, and the carrier inversion mechanism 31. A preform loading mechanism 35 for supplying the preform P to the preform carrier 7 from below is provided.

  The carrier reversing mechanism 31 includes a pivot shaft 313 horizontally spanned between a pair of support frames 311 and 312 attached to the gantry frame 2, a rotation cylinder 310 that rotates the pivot shaft 313 in the forward and reverse directions, and a pivot shaft. Rotating member 314 that rotates integrally with 313 is provided. The swivel member 314 has a point-symmetric shape about the swivel axis 313, and is provided with carrier holding portions 315 and 316 at both ends, respectively. The carrier holding portion 315 is formed with a pair of guide grooves 317 and 318 having the same cross-sectional shape as the guide rail 8 (4).

  The guide grooves 317 and 318 of the carrier holding portion 315 are positioned to coincide with the guide grooves 805 and 806 on the lower guide rail 8 (4) side at the initial position of the turning member 314, that is, the turning stop position shown in the drawing. ing. The other carrier holding portion 316 also includes a pair of guide grooves 317 and 318 having the same cross-sectional shape as the guide rail 8 (1). These guide grooves 317 and 318 are the initial positions of the turning member 314, that is, the turning stop shown in the drawing. The position coincides with the guide grooves 805 and 806 on the upper guide rail 8 (1) side.

  In addition, preform drop prevention claws 321 and 322 are arranged in the carrier holding portions 316 and 317, respectively. These preform drop prevention claws 321 and 322 can be moved in the horizontal direction by drive mechanisms such as electromagnetic solenoids 323 and 324, respectively. In order to prevent the preform P attached to the insertion core portion 73 of the preform carrier 7 held by the carrier holding portions 316 and 317 from coming out of the core portion 73, each preform drop prevention claw 321, 322 is configured to engage with the annular protrusion P2 of the preform P at its protruding position (in FIG. 4, one claw 321 is the protruding position). When the claws 321 and 322 return to the retracted position (the other pawl 322 is in the retracted position in FIG. 4), the claws 321 and 322 are disengaged from the annular protrusion P2 of the preform P.

  In this example, each of the carrier holding portions 315 and 316 includes a guide groove having a length capable of holding four preform carriers 7 at a time, and the preform carriers 7 are inverted by four. Positioning plungers 331 and 332 are arranged so that the preform carriers 7 (7 (1) to 7 (4)) held by the carrier holding portions 315 and 316 do not move along the guide grooves. I have. When the four operating rods 341 to 344 of the positioning plunger 331 protrude, the positions of the four preform carriers 7 held by the carrier holding portion 315 are fixed. Similarly, when the operation rods 345 to 348 of the positioning plunger 332 protrude, the positions of the four preform carriers 7 held by the carrier holding portion 316 are fixed.

  Next, the preform loading mechanism 35 receives the supply inclined groove 351 for sliding the new preform P by its own weight and the preform P one by one at the lower end position of the inclined groove 351, and is orthogonal to the inclined groove. An array mechanism 36 that arranges four preforms P at a constant pitch in the horizontal direction, and the four preforms P arranged by the array mechanism 36 are raised vertically to invert these preforms P. An attachment mechanism 37 is provided for attaching to four preform carriers 7 held in an inverted state by one carrier holding portion 315 of the mechanism 31.

  The arrangement mechanism 36 includes a preform transfer plate 361 having four semicircular grooves formed at a constant pitch, and a linear cylinder 362 that moves the transfer plate 361 horizontally at a constant pitch. ing. Each time the preform P is received in each groove of the preform transfer plate 361, the preform transfer plate 361 moves in the horizontal direction at a constant feed pitch.

  As shown in FIG. 6, in order to deliver the preform P from the inclined groove 351 to each groove of the transfer plate 361 in a timely manner, a restriction for restricting the movement of the preform P on the lower end side portion of the inclined groove 351. A claw 352 is disposed, and the restriction claw 352 can be moved by a plunger 353 between a protruding position where the movement of the preform is stopped and a retracted position where the preform is freely moved.

  The transfer plate 361 in which the preforms P (1) to P (4) are suspended in the grooves formed at a constant pitch is then lifted vertically by the mounting mechanism 37 as it is. The mounting mechanism 37 includes a lifting cylinder 371. By this lifting cylinder 371, the transfer plate 361 has the insertion core portion 73 of the preform carrier 7 completely in the initial position shown in FIG. 4 and the opening P 1 of the preform P suspended from the transfer plate 361. Move between the raised position where it is inserted.

  In this example, as can be seen from FIG. 4, a support plate 363 is attached to the gantry frame 2, and the support plate 363 supports a lifting cylinder 371 through a linear guide 364 extending horizontally. 365 is attached, and a transfer plate 361 is attached and fixed to the tip of the operating rod of the elevating cylinder 371.

  In this way, four preforms P with respect to the four preform carriers 7 (1) to 7 (4) held in an inverted state (downward) by the carrier holding portion 315 of the reversing mechanism 31. Mounted from the bottom. After the preforms P (1) 0P (4) are mounted, the turning member 314 is turned by the rotating cylinder 310, and the carrier holding portion 315 reaches the position of the carrier holding portion 316 in FIG. On the contrary, the carrier holding part 316 reaches the position of the carrier holding part 315. Thereafter, the plungers 331 and 332 are driven to open the preform carriers 7 held by the carrier holding portions 315 and 316 so that they can slide freely.

  Next, as shown in FIG. 1, the push rod 38 is driven so that the four preform carriers 7 held in the guide grooves of the carrier holding portion 315 are placed horizontally from the guide grooves of the carrier holding portion 315. Extrude. Since one end of the upper guide rail 8 (1) is positioned adjacent to the carrier holding portion 315, the preform carrier 7 pushed out from the carrier holding portion 315 is delivered to the upper guide rail 8 (1).

  Thus, while the preform carrier 7 carrying the preform P is being transferred from the preform supply unit 3 to the upper guide rail 8 (1), the other carrier holding unit 316 side of the reversing mechanism 31. Then, the following operations are performed. First, four preform carriers 7 from the lower guide rail 8 (4) are transferred to the carrier holding portion 316 in an inverted state (downward). As described above, the preform P is mounted on the four preform carriers 7 held by the carrier holding portion 316 from below.

  The reversing mechanism 31 delivers four preform carriers 7 (1) to 7 (4) holding the preform P in one carrier holding portion to the upper guide rail 8 (1), and 4 in the other carrier holding portion. After receiving the preform carriers 7 (1) to 7 (4) and attaching the preform P to them, the turning member 314 is turned to set the carrier holding portion to the opposite turning stop position. By repeating such an operation, the preform P is supplied.

  Therefore, in the preform supply unit 3 of the present example, the reversing mechanism 31 includes the carrier holding units 315 and 316 at the point-symmetrical positions on both ends of the swiveling member 314. Therefore, the rotation balance during swiveling is good and smooth. Since the turning operation can be realized, the turning speed can be increased. Furthermore, since separate operations are simultaneously performed in the carrier holding portions 315 and 316 at both ends, the work efficiency is good. Therefore, the operation speed of the biaxial stretch blow molding machine 1 can be increased.

  Further, since the height of the positions of the carrier holding portions 315 and 316 on both ends of the revolving member of the reversing mechanism 31 is increased, the projection from the lower guide rail 8 (4) having a step to the upper guide rail 8 (1) is increased. There is also an advantage that the reform carrier delivery operation can be realized by a simple mechanism.

(Conveyance path 8 (2))
Next, the preform carriers 7 delivered by four to the upper guide rail 8 (1) advance along the guide rail 8 (1). As shown in FIG. 1, the front end portion 821 of the guide rail 8 (1) is bent and is approaching the loop-shaped transfer device conveyance path. As a result, the preform carrier 7 reaching the front end portion of the guide rail 8 (1) is received in a groove formed in the transfer tool 84 circulating along the loop-shaped path. That is, the large-diameter flange 74 of the preform carrier 7 rides on the edge of the groove. Thereafter, each preform carrier 7 carrying the preform P is conveyed by each transfer tool 84.

  As described above, the five heating units 4 (1) to 4 (5) are arranged on the transfer path of the transfer tool 84, and the preform P transferred by the transfer tool 84 has a temperature suitable for molding. Heated to a state. Further, drive mechanisms 85 and 86 are arranged in the heating portion. Each of the drive mechanisms 85 and 86 includes timing belts 853 and 863 that are bridged between the drive gears 851 and 861 and the driven gears 852 and 862. The timing belts 853 and 863 are disposed so as to mesh with the annular external gear 75 of each preform carrier 7 conveyed by the transfer tool 84. Therefore, the preform carrier 7 conveyed by the transfer tool 84 is rotated by the timing belts 853 and 863 with the cylindrical main body 71 rotatably mounted inside the large diameter flange 74 riding on the transfer tool 84. . That is, the preform P attached to the insertion core portion 74 formed at the tip of the cylindrical main body 71 rotates.

  Thus, since the preform P conveyed through the heating units 4 (1) to 4 (5) is conveyed while rotating, there is an advantage that each part of the outer peripheral surface is uniformly heated.

  Further, if the position of the front end portion 821 of the guide rail 8 (1) is changed to a position between the heating units 4 (1) and 4 (2), the number of heating units through which the preform P passes, in other words, heating. There is also an advantage that heating conditions such as time can be easily changed.

(Pitch expansion mechanism and transfer mechanism)
The heated preform P is transported along the guide rail 8 (3) by the transfer mechanism 10 into the stretch molding unit 5 after the feed pitch is expanded by the pitch expanding mechanism 9. Moreover, the molded product F obtained by the stretch molding unit 5 is carried out to the outside of the stretch molding unit 5 along the guide rails 8 (3) by the transfer mechanism 10, and further delivered to the molded product take-out unit 6.

  8 is a schematic side view of the pitch expansion mechanism 9 and the transfer mechanism 10 as viewed from the preform conveying direction. FIG. 9 is a schematic configuration of the pitch expansion mechanism 9 before pitch conversion when viewed from the direction of the arrow 9A in FIG. FIG. 10 is a plan configuration diagram of the pitch expansion mechanism after pitch conversion, and FIG. 11 is a plan configuration diagram of the transfer mechanism. With reference to these drawings, configurations of the pitch enlarging mechanism 9 and the transfer mechanism 10 will be described.

  First, the pitch enlarging mechanism 9 includes a pantograph mechanism 90 that can extend and contract along the guide rail 8 (3), four transfer plates 91 to 94, and the pantograph mechanism 90 along the guide rail 8 (3). A linear motion cylinder 96 for expanding and contracting in the direction and a linear motion cylinder 97 for moving the transfer plates 91 to 94 forward and backward in a direction orthogonal to the guide rail 8 (3) are provided.

  More specifically, as can be seen from FIGS. 8 and 9, the movable support plate is movable at the front end of the support arm 98 attached to the gantry frame 2 so as to move forward and backward with respect to the guide rail 8 (3). 981 is attached, and this movable support plate 981 is movable in a direction perpendicular to the preform conveying direction by a linear motion cylinder 97 attached to the support arm 98. The main body side of the linear cylinder 96 is attached to the moving support plate 981, and four transfer plates 91 to 94 are supported via linear guides 982. The operating rod side of the linear cylinder 96 is connected to the transfer plate 91.

  As can be seen from FIG. 9, the rear ends of the four transfer plates 91 to 94 are rotatably connected to the four link nodes 901 to 904 of the pantograph mechanism 90. Grooves 91 a to 94 a that can receive the cylindrical main body 71 of the preform carrier 7 are formed at the front ends of the transfer plates 91 to 94. Although not shown, the preform carriers 7 (1) to 7 (4) conveyed along the guide rail 8 (3) are stopped at the positions shown in FIG. 9 by the stopper. It has become.

  The operation of the pitch enlargement mechanism 9 having this configuration will be described. In the initial state, each of the transfer plates 91 to 94 is in a retracted position retracted from the guide rail 8 (3). As shown in FIG. 9, the preform carriers 7 (1) to 7 (4) carrying the preforms P (1) to P (4) are retracted along the guide rails 8 (3). When reaching the positions facing the grooves 91a to 94a of the transfer plates 91 to 94, the respective transfer plates 91 to 94 are advanced by the linear motion cylinder 97 to the positions indicated by the solid lines in the figure, and the respective preform carriers 7 The cylindrical main body 71 of (1) -7 (4) is received.

  Next, the pantograph mechanism 90 is extended by the linear motion cylinder 96. As a result, the distance between the transfer plates 91 to 94 connected to each node is also increased. As a result, the pitch of the preform carriers 7 (1) to 7 (4) held on the transfer plates 91 to 94, in other words, the pitch of the preforms P 1 to P 4 carried on them is increased.

  After the pitch is increased in this way, the transfer tools 91 to 94 are returned to the retracted position by the direct acting cylinder 97, and then the transfer tools 91 to 94 are narrowed to the original intervals by the direct acting cylinder 96.

  Next, the structure of the transfer mechanism 10 that transfers the four preform carriers 7 (1) to 7 (4) while maintaining the enlarged pitch will be described.

  The transfer mechanism 10 includes a transfer plate 101, a linear motion cylinder 102 that moves the transfer plate 101 forward and backward in a direction orthogonal to the guide rail 8 (3), and the transfer plate 101 along the guide rail 8 (3). And a linear cylinder 103 that moves forward and backward by a certain distance.

  Specifically, as shown in FIGS. 8 and 11, the movable support plate 106 is supported by the gantry frame 2 via the linear guide 105, and the linear movement is performed between the gantry frame 2 and the movable support plate 106. A cylinder 103 is connected. The movement support plate 106 supports a transfer plate 101 via a linear guide 107, and a linear motion cylinder 103 is connected between the movement support plate 106 and the transfer plate 101.

  The transfer plate 101 is formed at the end facing the guide rail 8 (3) at intervals equal to the feed pitch in which four grooves 111 to 114, 121 to 124, and 131 to 134 are enlarged. These three groups of grooves are formed at equal intervals for each group in the direction along the guide rail.

  Moreover, each groove | channel is a groove | channel which can receive the cylindrical part 74a of the large diameter flange 74 of the preform carriers 7 (1) -7 (4) arranged with the expanded feed pitch.

  Further, as shown in FIG. 11, each set of groove groups has a pitch enlargement mechanism in which the grooves 111 to 114 on the near side in the transport direction are located in the state where the central grooves 121 to 124 are located in the stretch molding part 5. 9, the preform carriers 7 (1) to 7 (4) whose pitch has been expanded by the position 9 can be received, and the forward grooves 131 to 134 in the transport direction have been completely unloaded from the stretch molding unit 5. In position.

  The transfer plate 101 configured as described above receives the preform carrier in each groove as shown in FIGS. 8 and 11, and the retracted position retracted in the direction orthogonal to the guide rail 8 (3) by the linear motion cylinder 102. Move between the forward positions. Further, the transfer plate 101 is moved by the linear motion cylinder 103 between an initial position shown in FIG. 11 and a feed position where the groove groups 111 to 114 reach the positions of the next groove groups 121 to 124. In this feed position, the groove groups 121 to 124 reach the positions of the groove groups 131 to 134, and the groove groups 131 to 134 reach the position of the molded product takeout portion 6 described later.

  The operation of the transfer mechanism 10 having this configuration will be described. As described above, when the feed pitch of the four preform carriers 7 (1) to 7 (4) is widened by the pitch expanding mechanism 9, the four transfer plates 91 to 94 of the pitch expanding mechanism 9 are retracted. Prior to this, the transfer plate 101 in the retracted position (101A in FIG. 11A) is moved from the retracted position to the advanced position (101B) by the linear motion cylinder 102, and the feed pitch is widened. Four preform carriers 7 (1) to 7 (4) are held in that state. Thereafter, the four transfer plates 91 to 94 of the pitch enlargement mechanism 9 are retracted to the retracted position.

  Next, the transfer plate 101 is fed from the forward movement position (101B) shown in FIG. 11 to the feed position (101C) by the linear motion cylinder 103. As a result, the four preform carriers 7 (1) to 7 (4) held in the groove groups 111 to 114 of the transfer plate 101 reach the stretch molding position of the stretch molding section 5.

  Here, at the time of this feeding, the four preform carriers 7 (1) to 7 (4) held in the groove groups 121 to 124 of the transfer plate 101 are carried out from the stretch molding unit 5. That is, the molded product F is carried out from the stretch molding unit 5. Further, the four preform carriers 7 (1) to 7 (4) held in the remaining groove groups 131 to 134 of the transfer plate are carried out to the molded product takeout unit 6.

  Next, the transfer plate 101 is retracted from the guide rail 8 (3) to the retracted position (101D) by the linear motion cylinder 102. Thereafter, the transfer plate 101 is returned to the initial position (101 </ b> A) by the linear motion cylinder 103.

  Here, while the transfer plate 101 of the transfer mechanism 10 is retracted from the feed position (101C) to the retracted position (101D) and further returned to the initial position (101A), the pitch enlargement mechanism 9 side has a narrow feed pitch. The operation of simultaneously increasing the feed pitch of the four preform carriers 7 (1) to 7 (4) that have been transported and when the transfer plate 101 of the transfer mechanism 10 returns to its initial position (101 A). Then, the pitch expansion operation has already been completed.

  Thus, in this example, the pitch enlargement mechanism 9 for performing the feed pitch conversion and the transfer mechanism 10 for transporting the preform carrier after the pitch has been increased are provided as separate configurations. Therefore, both operations can be performed simultaneously. As a result, the operation speed of the biaxial stretch blow molding machine 1 can be increased.

(Extension molding part)
In the stretch molding part 5, it is carried by the four preform carriers 7 (1) to 7 (4) carried into the stretch molding position as described above by the transfer mechanism 10 along the guide rail 8 (3). Biaxial stretch blow molding is performed on the preforms P (1) to P (4) to form a PET bottle F.

  FIG. 12 shows a schematic configuration of the stretching rod raising / lowering mechanism and the blow air supply mechanism in the stretching unit 5 as viewed from the preform conveying direction. As shown in this figure, the stretching rods 501 stand by directly below the four preform carriers 7 (1) to 7 (4) carried into the stretching molding position. The extending rod 501 is supported by the operating rod 504 of the extending cylinder 503 via the support bracket 502. By extending the working rod 504 of the stretching cylinder 503, the stretching rod 501 passes through the cylindrical body 71 of the corresponding preform carrier 7 (1) -7 (4), and the preforms P (1) -P (4 ), And ascending to the position indicated by the imaginary line in the figure.

  On the other hand, a cylindrical core 505 for supplying blow air is disposed so as to be concentrically surrounding the extending rod 501 so as to be positioned immediately below each preform carrier. The cylindrical core 505 moves up and down with a slight stroke by a blow air cylinder 506. In its raised position, the cylindrical core 505 is connected to the lower end opening of the cylindrical body of the preform carrier. Blow air is supplied to the cylindrical core 505 from a compressed air supply source (not shown). Therefore, when blow air is supplied in a state where the cylindrical core 505 is raised and connected to the preform carrier, the blow air is supplied into the preform via the cylindrical core 505 and the preform carrier.

  As described above, the preform is subjected to biaxial stretch molding in a PET bottle molding cavity formed by a pair of stretch molding dies 51 and 52 for stretch molding by the stretching action of the blow air and the stretching rod.

  Next, FIG. 13 is a schematic side view of the mold clamping mechanism as seen from the preform conveying direction, FIG. 14 is a schematic plan view thereof, and FIG. 15 is a schematic side view as seen from a direction orthogonal to the preform conveying direction. is there.

  Referring to these drawings, the mold clamping mechanism 53 includes the first and second toggle link mechanisms 54 and 55 and the link connection points 541 in the first and second toggle link mechanisms 54 and 55. , 551 and oscillating mechanism 56 for reciprocating in synchronization in the reverse direction.

  The first toggle link mechanism 54 is for moving one extending mold 51 along its linear guide 511 supported by the gantry frame 2 to its open position and close position. The first toggle link mechanism 54 has a configuration in which two links 542 and 543 are connected in a direction perpendicular to the preform conveying direction, and the outer end of one link 542 is vertically moved to the frame side of the frame. The other end of the link 543 is connected to the stretching mold 51 so as to be rotatable up and down. In the mold clamping state, the two links 542 and 543 are in a state of extending horizontally, and in the mold opening state, the link connecting points 541 are pushed up or down to form a dogleg shape.

  The second toggle link mechanism 55 has basically the same structure, and the other extension mold 52 is moved along its linear guide 521 supported by the gantry frame 2 to its open and close positions. It is for making it happen. The second toggle link mechanism 55 also has a configuration in which two links 552 and 553 are connected in a direction perpendicular to the preform conveying direction, and the outer end of one link 552 is moved up and down on the frame side. The inner end of the other link 553 is connected to the stretch mold 51 so as to be rotatable up and down. In the mold clamping state, the two links 552 and 553 are in a state of extending horizontally, and in the mold opening state, the link connecting points 551 are pushed up or down to form a dogleg shape.

  The swing mechanism 56 has support plates 561 and 562 attached to the gantry frame 2 so as to sandwich the four stretch molding positions 5 (1) to 5 (4) of the stretch molding unit 5 from both sides in the preform conveying direction. The swing plates 563 and 564 are attached to the respective support plates so as to be swingable in the vertical direction. These swing plates 563 and 564 extend in parallel to a direction orthogonal to the preform carrier transport direction.

  Both end portions of the swing plates 563 and 564 are connected to each other by connecting members 565 and 566 extending in the preform conveying direction. Connection pins 567 and 568 extending horizontally in the preform conveying direction are attached to the central portions of the connection members 565 and 566 via brackets 581 and 582, respectively. Respective lower ends of connecting shafts 569 and 570 extending in the vertical direction are rotatably connected.

  Connection pins 571 and 572 that extend horizontally in the preform conveying direction are attached to the link connection points 541 and 551 of the first and second toggle link mechanisms 54 and 55 via brackets. The upper ends of the connection shafts 569 and 570 are rotatably connected to the connection pins 571 and 572.

  Further, the bracket 568 attached to the central portion of one connecting member 566 that connects the rocking plates 563 and 564 to each other is a protrusion that protrudes outward with respect to the rocking center from the connecting position of the connecting shaft 570. A portion 568a is provided. A mold opening / closing cylinder 581 attached to the gantry frame 2 is vertically disposed immediately below the protruding portion 568a. The tip of an operating rod 582 extending vertically upward from the cylinder 581 is connected to the protruding portion 568a in a rotatable state.

  The mold clamping operation of the mold clamping mechanism 53 having this configuration will be described. In the mold clamping state, as can be seen from FIG. 13, the first and second toggle link mechanisms 54, 55 are in a state of extending horizontally, and the swing plates 563, 564 are of the extension mold 52 with respect to the horizontal. It is held in a slightly inclined state so that the side is located at the top.

  When the mold is opened from this mold-clamping state, the operating rod 582 of the cylinder 581 is retracted, and the swing plates 563 and 564 are swung to a state inclined in the opposite direction with respect to the horizontal as indicated by a one-dot chain line 564A. As the swinging plates 563 and 564 are turned, the link connecting point 541 of the first toggle link mechanism 54 connected to one end thereof is pushed up to a state indicated by an imaginary line in FIG. Then, the stretch mold 51 is retracted to its open position. On the other hand, the link connection point 551 of the other second toggle link mechanism 55 is pulled down to a state indicated by an imaginary line in FIG. 13, and in conjunction with this, the stretch mold 52 is moved to its open position. fall back.

  In this way, the first and second toggle join mechanisms 54 and 55 are moved in a state where they are synchronized in opposite directions. Accordingly, the stretch molds 51 and 52 are also retracted from each other in a synchronized state.

  In the mold clamping operation, contrary to the above case, by pushing the operating rod 582 of the cylinder 581, the swinging plates 563 and 564 are swung until they are in the inclined state shown by the solid line in FIG. As a result, the links 542 and 543 and the links 552 and 553 of the first and second toggle joint mechanisms 54 and 55 are synchronously moved in the upside down direction to be in the horizontal state. As a result, the stretch molds 51 and 52 advance in synchronization with each other to form a clamped state.

  In the mold clamping mechanism 53 of the present example, a pair of toggles for opening and closing the pair of extending molds by using the movement of the swing plate of the common swing mechanism 56 at the symmetrical position from the swing center. The link mechanism is moved in the opposite direction with complete synchronization. Therefore, an uneven load is not generated in each part of the mold clamping mechanism when the mold is opened and closed, and adverse effects such as generation of wear of each part and application of impact force to each part can be avoided. Therefore, a smooth and quick mold opening / closing operation can be realized, and as a result, the operation speed of the biaxial stretch blow molding machine 1 can be increased.

(Molded product removal part)
The molded product take-out unit 6 receives the preform carrier 7 carrying the molded product F obtained through the stretch molding unit 5 from the upper guide rail 8 (3), and reverses it while holding the molded product. In the inverted state, after that, the molded product F is extracted from the preform carrier 7, and the empty preform carrier 7 is delivered to the lower guide rail 8 (4).

  FIG. 16 is a schematic configuration diagram of the molded product take-out unit 6 as viewed from the preform conveying direction, and FIG. 17 is a schematic plan configuration diagram thereof. With reference to these drawings, the structure of the molded product takeout part 6 will be described.

  The molded product take-out unit 6 removes the molded product F from the carrier reversing mechanism 61 for reversing the upright preform carrier 7 to the inverted state and the preform carrier 7 held in the upright state by the carrier reversing mechanism 61. A molded product unloading mechanism 65 is provided.

  The carrier reversing mechanism 61 includes a pivot shaft 613 horizontally spanned between a pair of support frames 611 and 612 attached to the gantry frame 2, a rotating cylinder 613a that rotates the pivot shaft 613 in the forward and reverse directions, and a pivot shaft. 613 and a turning member 614 that rotates integrally therewith. The swivel member 614 has a point-symmetric shape about the swivel axis 613, and includes carrier holding portions 615 and 616 at both ends.

  The carrier holding portion 615 includes a pair of guide rails 621 and 622 in which a pair of guide grooves 617 and 618 having the same cross-sectional shape as the guide rail 8 (3) is formed. These guide rails 621 and 622 can be moved up and down with respect to the support frame 625 attached to the turning member 614 via linear guides 623 and 634. A lift cylinder 626 is attached to the support frame 625, and the guide rails 621 and 622 can be lifted and lowered by a certain stroke by the lift cylinder 626.

  In the state where the guide rails 621 and 622 are at the initial position, the guide grooves 617 and 618 formed on the guide rails 621 and 622 are on the side of the guide rail 8 (3) at the initial position of the turning member 614, that is, at the turning stop position shown in the drawing. The guide grooves 805 and 806 coincide with each other. The other carrier holding portion 616 also has guide rails 621 and 622 provided with a pair of guide grooves 617 and 618 having the same cross-sectional shape as the guide rail 8 (4). These guide grooves 617 and 618 are swivel members. In the initial position of 614, that is, in the turning stop position shown in the drawing, the position coincides with the guide grooves 805 and 806 on the guide rail 8 (4) side.

  In this example, each of the carrier holding portions 615 and 616 includes a guide groove having a length capable of holding four preform carriers 7 at a time, and the preform carriers 7 are inverted by four.

  Next, the molded product unloading mechanism 65 includes a pair of gripping pieces 651 and 652 capable of gripping the neck portion F1 of the molded product F mounted on the preform carrier 7 held by the carrier holding portions 615 and 616 from both sides. And a pair of guide plates 661 and 662 that can be engaged with an annular protrusion F2 formed on the outer peripheral surface of the molded product neck F1.

  As can be seen from FIG. 17, the pair of gripping pieces 651 and 652 have curved grooves 651a and 652a on the front surface thereof that can grip the portion between the two annular projections F2 and F3 of the molded product assembly F1 from the side. Is formed. In this example, the gripping pieces 651 and 652 are each divided into four to form four pairs, and each pair of gripping pieces is each preform carrier 7 (1) to 7 (1) to 7 (7) sent by the transfer mechanism 10. (4) can be gripped from both sides at the same position. The gripping pieces 651 and 652 are opened and closed by linear cylinders 653 and 654 attached horizontally to the support frame 625 of the turning member 614.

  On the other hand, as can be seen from FIG. 17, the inner edges 661a and 662a of the pair of guide plates 661 and 662 are flat surfaces extending in parallel to the preform conveying direction. These guide plates 661 and 662 can enter the lower side of the annular projection F2 of the molded product neck F1 from the side. When such a state is formed, the molded product F can be suspended from the pair of guide plates 661 and 662 by the annular projection F2, and can be slid along the guide plates 661 and 662. The guide plates 661 and 662 are opened and closed by linear cylinders 663 and 664 that are horizontally attached to the support frame 625 of the turning member 614.

  The operation of the molded product takeout unit 6 configured as described above will be described. First, the four preform carriers 7 (1) to 7 (4) carry the molded product F by the transfer plate of the transfer mechanism 10 described above, along the upper guide rail 8 (3). Is sent to the carrier holding portion 615 on the upper side of the reversing mechanism 61 that is waiting in the turning stop state shown in FIG.

  Thereafter, the pair of gripping pieces 651 and 652 are advanced from the retracted position shown in FIG. 16 by the direct acting cylinders 653 and 654 to grip the molded product neck F1 of each carrier 7 from both sides. At the same time, the pair of guide plates 661 and 662 is advanced from the retracted position shown in FIG. 16 by the linear motion cylinders 664 and 664 and engaged with the annular side surface of the annular protrusion F2 of the molded product neck F1 of each carrier 7. It becomes. Thereafter, the transfer plate of the transfer mechanism 10 moves backward.

  Next, the reversing mechanism 61 turns 180 degrees around the turning shaft 613, and the carrier holding part 615 located on the upper right side in FIG. 16 is the position of the other carrier holding part 616 in FIG. To. On the contrary, the carrier holding part 616 reaches the position of the carrier holding part 615 in the figure. When the carrier holding portion 615 is inverted in this way, the four preform carriers 7 held there are also switched from the upright state to the inverted state.

  Here, together with the carrier holding portions 615 and 616, the components are reversed together with each component of the molded product unloading mechanism 65 attached to the turning member 614. Therefore, the molded product F carried on each preform carrier 7 is inverted while the neck F1 is held by the pair of holding pieces 651 and 652 and engaged with the pair of guide plates 661 and 662. To do. Therefore, the molded product F does not come out of each preform carrier 7 during the reversing operation.

  Next, the carrier holding portion 615 is lifted by the lifting cylinder 626. FIG. 16 shows a state where the carrier holding portion 615 is lifted. When the carrier holding portion 615 is lifted, the four preform carriers 7 held therein are also lifted simultaneously. However, the molded product F carried on each preform carrier 7 is still gripped by the pair of gripping pieces 651 and 652. Therefore, when each preform carrier 7 is lifted, its insertion core 73 is pulled out from the molded product F.

  Thereafter, the pair of gripping pieces 651 and 652 are retracted, and the gripping state of the molded product neck F1 is released. However, since the pair of guide plates 661 and 662 remain engaged with the lower side of the annular projection F2 of the molded product neck F1, the molded product F released from the gripping pieces 651 and 652 is in contact with the pair of guide plates 661. , 662 is suspended. It is also possible to slide along these guide plates. After this state is formed, four molded products F are sent out in a direction opposite to the direction toward the lower guide rail 8 (4) by a push rod (not shown) and delivered to the carry-out conveyor 665 shown in FIG. . By the carry-out conveyor 665, the molded product F is recovered by a predetermined recovery unit (not shown).

  On the other hand, the four preform carriers 7 after the molded product is extracted are sent out toward the guide rail 8 (4) by the push rod 671 shown in FIG.

  Note that the above explanation has been made mainly on the operation on the side of one carrier holding portion 615. However, in the other carrier holding portion 616 as well, the molded product F is removed at the lower position shown in FIG. In the state in which the preform carrier that has been emptied and the preform carrier that has been emptied are swung to the upper position, the preform carrier is carried in from the transfer mechanism 10, the molded product is gripped by the gripping piece, and the molded product is guided by the guide plate. The holding operation is performed.

  As described above, in the molded product takeout unit 6 of this example, the reversing mechanism 61 includes the carrier holding portions 615 and 616 at the point-symmetrical positions on both ends of the turning member 614. Since a smooth turning operation can be realized, the turning speed can be increased. Furthermore, since separate work is simultaneously performed in the carrier holding portions 615 and 616 at both ends, the work efficiency is good. Therefore, the operation speed of the biaxial stretch blow molding machine 1 can be increased.

  Also, since the height of the carrier holding portions 615 and 616 at both ends of the revolving member of the reversing mechanism 61 is given a difference in level, the upper guide rail 8 (3) having a step is lowered to the lower guide rail 8 (4). Reform carrier delivery operation can be performed quickly by a simple mechanism. As a result, the operation speed of the biaxial stretch blow molding machine 1 can be increased.

  In addition to the above configuration, the molded product take-out unit 6 is provided with a detection mechanism for detecting the quality of the molded product carried on the preform carrier, and a pair of grips based on the detection result by the detection mechanism. It can comprise so that opening and closing of a piece and a pair of guide plate may be controlled. If this configuration is adopted, when a defective molded product is detected in the molded product take-out unit 6, the gripped piece and the guide plate are simultaneously opened to carry out the defective molded product to the molded product recovery unit. It is convenient because it can be dropped and separated and recovered.

  As described above, according to the biaxial stretch blow molding machine according to the present embodiment, it is possible to improve the efficiency of the operation of each component, and thus it is possible to realize a biaxial stretch blow molding machine with a high processing speed. .

  That is, in the biaxial stretch blow molding machine according to the present embodiment, using the reversing means, the preform carrier delivery operation between the conveying paths with different heights is performed simultaneously on both conveying paths. be able to. Therefore, the preform carrier delivery operation between the transport paths can be performed efficiently.

  In addition, in the preform supply unit of the biaxial stretch blow molding machine according to the present embodiment, while one preform carrier holding unit in the reversing unit is performing the operation of receiving an empty preform carrier, The preform carrier holding unit is configured to perform a preform mounting operation on the preform carrier and a preform carrier carrying the preform. Therefore, the preform carrier delivery operation between the conveyance paths and the preform supply operation to the preform carrier can be efficiently performed.

  Furthermore, in the molded product take-out unit of the biaxial stretch blow molding machine according to the present embodiment, while performing the operation of receiving the preform carrier carrying the molded product in one preform carrier holding unit in the reversing means, The other preform carrier holding portion is configured to perform an operation of extracting a molded product from the preform carrier and an operation of feeding out an empty preform carrier. Therefore, the preform carrier delivery operation and the molded product take-out operation between the conveyance paths can be performed efficiently.

  Next, in the biaxial stretch blow molding machine according to the present embodiment, the preform carrier feed pitch is widened in front of the stretch-molded portion by the pitch enlargement mechanism, and the preform carrier after the feed pitch is widened is separated and independent. In addition to being fed into the stretch molding part by a transfer mechanism that operates in a continuous manner, it is fed out from the stretch molding part. Thus, since the pitch enlargement mechanism and the transfer mechanism that operate independently are provided, it is possible to efficiently perform the operation of feeding the preform carrier into the stretch-molded part after widening the feed pitch of the preform carrier.

(A) And (B) is the schematic plan view and schematic side view of the biaxial stretch blow molding machine to which this invention is applied. (A)-(C) are explanatory drawing which shows the shape of a preform, explanatory drawing which shows the structure of a preform carrier, and explanatory drawing which shows the shape of a molded article. (A) And (B) is a schematic sectional drawing which shows the upper conveyance path | route and the lower conveyance path | route in the biaxial stretch blow molding machine of FIG. It is a schematic block diagram at the time of seeing the preform supply part in the biaxial stretch blow molding machine of Drawing 1 from a preform conveyance direction. FIG. 5 is a schematic configuration diagram when the preform supply unit of FIG. 4 is viewed from a direction orthogonal to the preform conveyance direction. It is a schematic plan block diagram of the preform supply part of FIG. It is a schematic block diagram at the time of seeing a preform supply part from the direction of the arrow A of FIG. It is a schematic block diagram at the time of seeing the pitch expansion mechanism and transfer mechanism in the biaxial stretch blow molding machine of Drawing 1 from the preform conveyance direction. It is a schematic plan view of the pitch expansion mechanism of FIG. It is a schematic plan view of the pitch expansion mechanism of FIG. It is explanatory drawing which shows the schematic plan view of the transfer mechanism of FIG. 8, and the movement path | route of a transfer plate. It is a partial schematic block diagram of the stretch molding part in the biaxial stretch blow molding machine of FIG. It is a schematic block diagram at the time of seeing the mold clamping mechanism in the biaxial stretch blow molding machine of FIG. 1 from the preform conveyance direction. FIG. 14 is a schematic partial plan view of the mold clamping mechanism of FIG. 13. It is a schematic block diagram at the time of seeing the mold clamping mechanism of FIG. 13 from the direction orthogonal to a preform conveyance direction. It is a schematic block diagram at the time of seeing from the preform conveyance direction of the molded article taking-out part of the biaxial stretch blow molding machine of FIG. It is a schematic plane block diagram of the molded article taking-out part of FIG.

Explanation of symbols

(overall structure)
DESCRIPTION OF SYMBOLS 1 Biaxial stretch blow molding machine 2 Base frame 3 Preform supply part 4 (1) -4 (5) Heating part 5 Stretch molding part 53 Clamping mechanism 6 Molded article taking-out part 7 Preform carrier 8 (1), 8 ( 3) Upper guide rail (upper transport path)
8 (4) Lower guide rail (lower transfer path)
9 Pitch enlargement mechanism 10 Transfer mechanism P, P (1) to P (4) Preform F, F (1) to F (4) Molded product (Preform supply unit)
DESCRIPTION OF SYMBOLS 3 Preform supply part 31 Carrier inversion mechanism 35 Preform loading mechanism 314 Rotating member 315,316 Preform carrier holding part 317,318 Guide groove 321,322 Fall prevention claw 351 Supply inclination groove 36 Arrangement mechanism 37 Mounting mechanism 371 Lifting cylinder 38 Push rod (pitch expansion mechanism and transfer mechanism)
90 Pantograph mechanism 91-94 Transfer plates 96, 97 Linear motion cylinder 101 Transfer plates 102, 103 Direct motion cylinder (clamping mechanism)
51, 52 Stretching mold 54, 55 Toggle link mechanism 56 Oscillating mechanism 542, 543, 552, 553 Link 541, 551 Link connection point 563, 564 Oscillating plate 581 Mold opening / closing cylinder (molded product takeout part)
61 Carrier reversing mechanism 65 Molded product unloading mechanism 614 Swivel member 615, 616 Carrier holding portion 617, 618 Guide groove 626 Lifting cylinder 651, 652 Holding piece 661, 662 Guide plate 653, 654 Direct acting cylinder 663, 664 Direct acting cylinder

Claims (2)

A mold clamping mechanism for opening and closing a pair of stretch molds in a biaxial stretch blow molding machine,
A first toggle link mechanism for moving one of the pair of stretch molds to an open position and a closed position;
A second toggle link mechanism for moving the other of the pair of stretching molds to an open position and a closed position;
Each link connection points in the first and second toggle link mechanism in synchronism with the upside down direction and a rocking mechanism for reciprocally moved,
The swing mechanism is
A swinging member disposed at a position below the first and second toggle link mechanisms so as to be swingable in a vertical direction around a predetermined swing center;
The first end and the second end of the swing member that are symmetrical with respect to the swing center are connected to the link connection points of the first and second toggle link mechanisms, respectively. First and second connecting members extending in the vertical direction,
Wherein the swing member, about said pivot center, mold clamping mechanism of the biaxially stretching blow molding machine, characterized in that it comprises a <br/> a mold opening and closing cylinder that swings up and down. Biaxial stretch blow molding to form a preform with a predetermined shape by transporting the preform carrier carrying the preform along the transport path passing through the heating section and the stretch molding section. In the machine
The stretch molding part has a pair of stretch molds and a clamping mechanism for opening and closing these stretch molds,
The biaxial stretch blow molding machine, wherein the mold clamping mechanism is the mold clamping mechanism according to claim 1 .

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