JPH0497823A - Rotary type blow molding machine - Google Patents

Abstract

PURPOSE:To perform with high accuracy the rotation of a turntable and positioning at the time of suspension, by a method wherein an annular driven gear is provided on a turntable, and a pair of idle gears gearing with the driven gear and a driving gear transmitting a turning of a motor are interposed between the driven gear and driving gear. CONSTITUTION:An annular driven gear 61 is fixed to an external circumference of a turntable 7 supported freely turnably on a base 5 through a support shaft. A pair of idle gears 62, 62 supported freely turnably through the support shafts 63 each provided on the base 5 in a standing state are geared with a driven gear 61. Then the pair of the idle gears 62, 62 are generated with a driving gear 66 fitted to a reduction gear 65 of an AC servomotor 64 on the above- mentioned base 5. Since the pair of the idle gears 62, 62 are interposed between the driving gear 66 and driven gear 61 on the external circumference of the above-mentioned turntable 7, a backlash between gears each can be removed and intermittent rotations of the turntable 7 and positioning at the time of suspension can be performed with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a rotary blow molding machine for blow molding detergent containers, makeup skin, etc. from parisons.

[Conventional technology]

For example, a turntable on which a plurality of pairs of opening/closing molds for sandwiching and blow-molding the parison is placed is disposed below an extruder that extrudes a parison made of thermoplastic resin vertically downward. A rotary type in which a drive gear that transmits the rotation of the motor is meshed with an annular driven gear provided at the bottom of the turntable, and the turntable is intermittently rotatable to continuously mold hollow resin products. There is a blow molding machine (this similar structure is, for example, JP-A-63-2
56420).

[Problem to be solved by the invention]

However, in conventional rotary blow molding machines, the drive gear that transmits the rotation of the motor is directly meshed with the annular driven gear of the turntable, so backlash between both gears may cause intermittent rotation of the turntable. There is a drawback that the position of the turntable cannot be determined with high precision when stopped.

Therefore, the present invention provides a rotary blow molding machine that can solve the above problems.

[Means to solve the problem]

A rotary blow molding machine in which a turntable is installed below an extruder that extrudes the parison, and a turntable is mounted with a plurality of molds for sandwiching and blow molding the parison, and this turntable is rotated by a motor. The turntable is provided with an annular driven gear, and a pair of idle gears meshing with both gears are interposed between the driven gear and a drive gear that transmits the rotation of the motor.

[Effect]

A pair of idle gears are interposed between an annular driven gear provided on the turntable and a drive gear that transmits rotation of the motor, and mesh with both gears to eliminate backlash between the respective gears.

Thereby, the rotation of the turntable and the positioning when stopped are performed with high precision.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a rotary blow molding machine, which has an extruder 10 that extrudes a tubular molten parison 2 made of thermoplastic resin vertically downward. This extruder 1
A pair of open/close molds 8° are used to hold the molten parison 2 and blow mold it on a turntable 7 which is rotatably supported on a base 5 attached to the base 5 via a support shaft 6 (see FIG. 8). Six sets of molds 8' are mounted on each base plate 9, and each pair of opening/closing molds 8.8' of these six sets is intermittently rotated in the section from station A to station F shown in FIG. By sequentially turning the molten parison 2, the molded article 2' becomes, for example, a detergent container, a decorative layer, etc.
(See Fig. 11) Continuous blow molding can be performed.

As shown in FIGS. 1 to 4, the extruder 10 includes a lower base 11 and an upper base provided on the lower base 11 so as to be pivotable in the horizontal direction with respect to the lower base 11 by a pivot drive mechanism 20. 12, and an extruder main body 13 which is placed on the upper base 12 and reciprocated in the vertical direction by a vertical drive mechanism 30 to supply the molten parison 2 into the pair of opening/closing molds 8° 8' when descending. has been done.

As shown in FIGS. 1 to 4, this extruder main body 13 has a hopper 14 on the upper rear side into which pelletized thermoplastic resin (raw material) is charged, and at the bottom of this hopper 14, A cylinder 18 has a built-in screw 16 that is rotated by a motor 15 or the like, and the outside is heated by a heater (not shown).
have. The thermoplastic resin heated and melted in this cylinder 18 is formed into three tubular molten parisons 2, 2.2 by a tubular push-in die head 19 provided at the tip of the cylinder 18, which is formed into a pair of vertically downward opening/closing molds 8. ,8
' The material is simultaneously extruded and supplied into each of the three cavities of the same shape formed within the cavity. Note that the molten parison 2 extruded from the extruder main body 13
is not limited to three, and may be one, two, or four or more.

As shown in FIGS. 1 to 4, the rotation drive mechanism 20 includes guides 21 fixed to four corners of the upper surface of the lower base 11.
, guides 22 fixed to the four corners of the lower surface of the upper base 12 and slidable relative to the guides 21, and a slewing ring bearing (inner bearing) having internal teeth 23a on the inner peripheral surface. 23 is fixed to the upper surface of the lower base 11, and a drive gear 27 fixed to a shaft portion 26a meshes with the inner teeth 23a of the inner bearing 23.

As shown in FIGS. 2 to 4, the vertical drive mechanism 30 includes a pair of hinges 31, 31 provided between the rear part of the upper base 12 and the rear part of the extruder main body 13, and a front part of the upper base 12. A pair of yoke absorbers 32.32 are interposed between the front part of the extruder main body 13 and a pair of brackets 33. A link 34, 34, a link 36 whose one end is pivotally supported by a pair of brackets 3535 hanging from the front side of the lower surface of the extruder main body 13, and a bracket 37 which stands up on the upper surface of the upper base 12 so as to be able to swing freely in the vertical direction. is pivoted on
The pair of links 34. is attached to the U-shaped portion at the tip of the rod 38a.
The hydraulic cylinder 38 is pivotally supported by a pin so as to sandwich the other end of the link 34 and the other end of the link 36.

Further, the parison cutting device 40, as shown in FIG. ．． 2. 2 upper end 2a.

The molds 2a and 2a are each cut to a certain length so that they slightly protrude from the upper surfaces of the pair of opening/closing molds 8 and 8'.

This parison cutting device 40 includes a base plate 41 fixed to the extruder main body 13 and extending horizontally below the front part of the cylinder 18, and a support shaft 43 on the base of the base plate 41 in the left-right direction. An air cylinder (actuator) 42 swingably supported by a shaft portion 44a
the center thereof is fitted into a one-way clutch 46 fixed to the lower surface of the tip of the base plate 41 with a bolt 45,
The tip of the rod 42a of the air cylinder 42 is fixed to a rotary plate 44 which is pivoted by a pin and rotates in one direction (clockwise) by the forward and backward movement of the rod 42a, and the lower end of a shaft portion 44a of the rotary plate 44. mounting plate 47 and this mounting plate 4
A cutter 48 with a triangular tip is attached to the front upper surface of the cutter 48 via a plurality of bolts 49, etc., and an air cylinder 42 and a rotary plate 44 are provided on the base plate 41, and the cutter 48 has a cutting start position. (Rotation start point position)
The cutter positioning mechanism 50 determines the position of the cutter. The cutter 48 does not reciprocate but rotates in one direction to cut the upper end 2a, 2a, 2a of each molten parison 2, 2.2.
Each melted parison2. '2.2 can be cut into a constant state, for example, a constant length. Incidentally, the upper end 2a of each molten parison 2 is left as an upper burr 2a' (burr at the mouth) on the upper part of the molded product 2' after blow molding.

As shown in FIGS. 5 and 6, the cutter positioning mechanism 50 includes a small air cylinder 51 fixed to a base plate 41 so as to be substantially parallel to the air cylinder 42, and a support shaft 53 mounted on the base plate 41. A pair of links 52.52 are swingably supported on the recess 41a of the base plate 41, and both ends are connected to the pair of links 52.52.
52 and the tip 51 of the rod of the air cylinder 51
The intermediate link 54 is rotatably supported via the support shaft 56 between the tips of the pair of links 52 and 52, and the circular arc-shaped link formed on the outer periphery of the rotating plate 44. It is comprised of a roller 55 that comes into contact with the notch 44b and can freely move away from it to determine the cutting start position (rotation start position) of the cutter 48.

The periphery of the lower surface of the turntable 7 rotatably supported on the base 5 via a support shaft 6 rests on a number of bearings 60 erected on the base 5. The annular driven gear 61 is fixed. A pair of idle gears 62 and 62 rotatably supported via respective support shafts 63 erected on the base 5 are meshed with the driven gear 61. Further, the pair of idle gears 62, 62 mesh with a drive gear 66 attached to a reduction gear 65 of the AC servo motor 64 on the base 5. This drive gear 66 and the turntable 7
a pair of idle gears 62 between the driven gear 61 on the outer periphery of the
, 62, it is possible to eliminate backlash between the respective gears, and the intermittent rotation of the turntable 7 and positioning when stopped can be performed with high precision.

Further, as shown in FIGS. 1 and 8, a mouth-shaped gate frame 67 is erected from the station B position of the turntable 7 on the base 5 to the station E position so as to straddle the turntable 7. be.

Further, at the position of station F of the turntable 7 on the base 5, a molded product storage container 68 and a chute 69 for storing the taken out molded products 2' are provided upright. At the station B of the turntable 7 of the gate frame 67, a pair of opening/closing molds 8.8' is provided with a parison for correcting the upper end 2a of the molten parison 2 before solidification into a flattened state, protruding above the upper surface. A shape modification mechanism 70 is provided. Further, between the upper frame 68a and the middle frame 68b that protrude above the turntable 7 of the molded product storage device 68, when the pair of opening/closing molds 88' are opened after the hollow molding, the molded product 2' is After gripping and raising the burr 2a', a molded product take-out device 80 is provided which sucks the upper burr 28' of the molded product 2' and takes it out while gripping the body 2b'.

As shown in Figs.
Four guide bolts 73. whose tips are fixed by nuts 72 to a bracket 71 fixed above the middle of a pair of opening/closing molds 8.8' are suspended. . . . and the same-shaped mounting plate 7 attached to the lower end of each guide bolt 73.
4, and the rack passes through and slides a pair of guide shafts 75.75 that are passed on both sides 74a, 74a of this mounting plate 74, and solidifies the molds 8.8' to protrude above the upper surfaces of the pair of opening/closing molds 8.8'. The upper end 2a, 2a, 2a of each previous melted parison 2, 2.2
a pair of clampers 76, 76 for clamping and correcting it to a flat standing state, and both sides 74a of the mounting plate 74.
, 74a, and the tip of each rod 77a is fixed to the center of each clamper 76, so that each clamper 7
It is composed of a pair of air cylinders 77 and 77 that bring the cylinders into and out of contact with each other.

Further, as shown in FIG. 11, the molded product take-out device 80 is disposed on the upper frame 68a of the molded product storage container 68, and when the pair of opening/closing molds 8.8' are opened after blow molding,
An upper burr gripping and taking-out mechanism 81 that grips and raises the upper burr 2a' of each molded product 2', and an upper burr gripping and taking-out mechanism 81 that is disposed on the middle frame 68b of the molded product storage container 68 and that is raised by the upper burr gripping and taking-out mechanism 81. A suction gripping and conveying mechanism 90 that sucks the upper part 2a' of each molded product 2' that comes, grips its body 2b' and rotates 180 degrees to store the molded product 2' in the molded product storage container 68. It is made up of.

As shown in FIGS. 11 to 14, the upper burr gripping and extraction mechanism 81 includes an air cylinder 82 erected on the tip side of the upper frame 68a of the molded product storage device 68, and a lot 82a of the air cylinder 82. fixed at the tip of the rod 82
A substantially square-shaped mounting plate 83 that moves vertically by expansion and contraction of a, and both side parts 83a, 8 of this mounting plate 83.
3b, the frame slides through a pair of guide shafts 84 and 84 passed over the molded product 2' from inside the pair of opening/closing molds 8 and 8' when opened.
A pair of chucks 85 and 86 that grip the upper burr 2a', and an air cylinder 87 that is attached to the center of the inner surface of one side 83a of the mounting plate 83 and has the tip of a rod 87a fixed to the center of one of the chucks 86. , are attached to both sides of the outer surface of one side portion 83a of the mounting plate 83, and the tips of each rod 88a are fixed to both sides of the other chuck 85 to form the three chuck pieces 8 of the other chuck 85.
9 and a pair of air cylinders 88 and 88 that bring the one chuck 86 into contact with and separate from the other. and,
Rods 87a and 88a of each of the above air cylinders 87 and 88
Due to the movement of the three chuck pieces 8 of one chuck 85
9 and the other chuck 86 to form the upper burr 2a' of the molded product 2'.
The molded product 2' is removed from the pair of opening/closing molds 8, 8 by the rod 82a of the air cylinder 82 and removed from the upper frame 68a of the molded product storage container 68.
It is designed to be raised to a predetermined position below.

As shown in FIGS. 1115 to 17, the suction gripping and conveying mechanism 90 includes a pair of arms 91 and 91 that are rotated every 180 degrees by a motor 92 that is installed upright on the middle frame 68b of the molded product storage container 68. A slide frame 94 is provided to be slidable in the front and back direction along a pair of guide shafts 93 and 93 provided on both sides of the front end of each arm 91, and the tip of the rod 95a is fixed to this slide frame 94, An air cylinder 95, which reciprocates the slide frame 94 in the front and back direction by the forward and backward movement of the rod 95a, is attached to the upper front surface of the slide frame 94 at an equal distance apart, and vacuum-chucks the upper burr 2a' of the molded product 2'. Three suction pads 96 are attached to the lower front side of the slide frame 94 at equal distances, and each air cylinder 98 is used to hold the molded product 2.
It is composed of three pairs of gripping pieces 97 and 97 for gripping and releasing the grip on the body 2b' of the body 2b'. Furthermore, the first
Reference numeral 99 in FIG. 1 is a proximity switch, and each proximity switch 99 allows each of the suction pads 96 and each pair of gripping pieces 97 and 97 provided at each front end of the pair of arms 91, 91 to open the pair. The rotational positions of the pair of arms 91, 91 are determined so that they are located above the opening/closing mold 8.8' and above the shooter 69 of the molded product storage container 68, respectively.

60° on the turntable 7 through six base plates 9
Each of the six sets of opening/closing molds 8.8' arranged at intervals
It can be opened and closed freely by a mold clamping device 100 shown in Fig. 8.18. This mold clamping device 100 consists of three support blocks 102 that stand upright at the center of the base plate 9 at an equal distance apart.
A pair of guide shafts 101, 101 fixed so as to be parallel to each other in the horizontal direction via
A pair of movable plates 103 which are slidably provided at 101 degrees and have the molds 8 and 8' fixed to opposing surfaces, respectively.
, 103', a pair of clamp rods 104, 104', one end of which is fixed to the back side of each of the movable plates 103, 103', for bringing the molds 8, 8' into contact with and away from each other, and the base plate 9. It is swingably supported by a bracket 106 erected at one end (outside) via a pivot 107 located below the height of each of the guide shafts 101, 101, and the other end of the one clamp rod 104' is attached to the upper end. The intermediate link 10
A swinging lever 1 is pivotally supported by a pin via a lever 8 and has a lower end projecting downward from the upper surface of the base plate 9 through an opening 9a.
05, and a pair of blocks 109, 1 below the base plate 9.
09, and one end of which is supported by a pin on the other end of the clamp rod 104' of the swing lever 105 via an intermediate link 111.
A slide rod 110 is pivotally supported by a pin at a lower end spaced apart from the other end of 8 and the pivot shaft 107 at a distance equal to the distance between the other end of the slide rod 110 and the other clamp rod 104 through the opening 9b of the base plate 9. A connecting plate 112 that connects the other ends and slides along a bracket 113 that stands up on the other end (inside) of the base plate 9, and a gate frame 67.
A pair of hydraulic cylinders (actuators) 114 and 115 suspended at positions corresponding to stations A and F allow the connecting plate 112 to move back and forth, and one of the hydraulic cylinders 114 moves the connecting plate 112 forward. A toggle mechanism that closes the pair of opening/closing molds 8.8' and moves the connecting plate 112 back by the other hydraulic cylinder 115 to open the pair of opening/closing molds 8.8' and maintain their state. 120.

This toggle mechanism 120 is rotatably supported in the vertical direction via a support shaft 122 by a bracket 113 that stands up on the other end (inside) of the base plate 9, and one end is attached to the other hydraulic cylinder 1.
The first link 121 is pressed by the first link 15 and the other end springs upward; The roller 124 is slid along the opening 113a of the bracket 113, and when the other end of the first link 121 springs upward, the connecting plate 112 is moved back, and the roller 124 is rotatably supported at one end. and a second link 123 that is pressed by one of the hydraulic cylinders 114 to move the connecting plate 112 forward.

The procedure for blow molding a molten parison 2 by intermittently rotating each pair of open/close molds 8, 8' from station A to station F using the rotary blow molding machine 1 of the embodiment will be described above.

First, it is opened at station F as shown in Figure 18,
A pair of open/close molds 8.8' from which each molded article 2' has been taken out by the molded article take-out device 80 rotates to station A. Therefore, when the AC servo motor 64 is stopped and the pair of opening/closing molds 88' is stopped at station A, the pair of opening/closing molds 8.8' 2, 2.2 are clamped by the mold clamping device 100. That is, the mold clamping device 1
The roller 124 of the second link 123 of 00 is pressed downward by the hydraulic cylinder 114, and the connecting plate 112 is moved to the base plate 9.
The top is moved outward (radially outward of the turntable 7) (forward movement).

Due to this forward movement of the connecting plate 112, one clamp rod 104 pushes one of the molds 8 in the closing direction, and the other clamp rod 104' pushes the slide rod 110. Intermediate link 111. Swing lever 105, intermediate link 108
is moved in the opposite direction to the one clamp rod 104 to push the other mold 8' in the closing direction. As a result, the pair of open/close molds 8, 8' are instantly closed so as to sandwich the three molten parisons 22.2.

Almost simultaneously with the clamping of the pair of opening/closing molds 8, 8', the rod 42a of the air cylinder 42 of the parison cutting device 40 moves back and forth, causing the cutter 48 to rotate at high speed in one direction (clockwise) of the arrow in FIG. , the above three melted parisons 2.2.
2 are instantly cut off. Since the cutter 48 is rotated in one direction by the one-way clutch 46 to cut each molten parison 22.2, it is possible to cut each molten parison 2.2.2 in a constant state, for example, to always cut the same constant length. can. This allows each melted parison 2
, 2.2, it is easy to monitor the cutting length and control the phytoback by processing the data.

Further, since the cutting start position of the cutter 48 is always positioned at the position shown by the solid line in FIG. 5 by the cutter positioning mechanism 50, the effect of always cutting each molten parison 2.2. Ru.

At approximately the same time as each molten parison 2, 2.2 is cut, the die head 19 side of the extruder main body 13 of the extruder 10 is moved by a pair of hinges 31.31 by the vertical drive mechanism 30, as shown in FIG. It rotates upward as a center and rises. As a result, when the pair of opening/closing molds 8.8' rotate to the next station B, each molten parison 2.8' being extruded from the pair of opening/closing molds 8.8' and the die head 19. 2.
2 will not interfere with each other. A pair of opening/closing molds 8.8'
When the extruder body 13 of the extruder 10 is rotated to a position where they do not interfere with each molten parison 2.2.2 being extruded, the die head 19 side of the extruder body 13 of the extruder 10 is centered around the pair of hinges 31.31, as shown in FIG. As the rod 38a of the hydraulic cylinder 38 of the vertical drive mechanism 30 moves downward, the rod 38a of the hydraulic cylinder 38 of the vertical drive mechanism 30 rotates downward and descends, and when the next pair of opening/closing molds 88' stay at station A, each molten parison 2. 2. The three molten parisons 2, 2.2 are continuously extruded from the die head 19 so that the parisons 2, 2.2 are extruded to a predetermined length.

Next, by driving the AC servo motor 64 and repeating the intermittent rotation and stopping every 60 degrees from station B to station E with the pair of open/close molds 8.8' closed, the above-mentioned A pair of opening/closing molds 8.8'
Compressed air is blown into each of the above-mentioned molten parisons 2 held between a pair of open/close molds 8 and 8' by a blow needle (not shown) built into the molten parison, and the parisons 2 are blow-molded into a predetermined hollow shape. The molded product 2' is cooled in a pair of open/close molds 8, 8'.

In this pair of opening/closing molds 8.8', the compressed air blowing device is not a blow bin but a blow needle.
The molded product 2' can only be removed using a blow pin. Therefore, at the station B, the upper ends 2a, 2a, 2a of each molten parison 2.2°2 before solidification, which protrude slightly from the upper surface of the pair of opening/closing molds 8.8', are moved to the pair of parison shape correction mechanisms 70. The clampers 76 and 76 respectively clamp each melted parison 2. 2. 2 upper end 2a
.

2a, 2a are corrected to a flat, upright state, so that the molded product 2' can be easily taken out from the pair of opening/closing molds 88' by a molded product removal device 80, which will be described later.

In addition, each section from station A to station F has a large diameter (for example, 2700 mm) and a high weight (approximately 10 mm).
The turntable 7 is powered by an AC servo motor 64.
A drive gear 66, a pair of idle gears 62, 62. High speed (
For example, 2.5 seconds) and intermittent rotation (for example, 60 seconds).
The pair of opening/closing molds 88' are sequentially rotated intermittently.

Furthermore, since a pair of idle gears 62 and 62 are interposed between the annular driven gear 61 fixed to the outer periphery of the turntable 7 and the drive gear 66 that transmits the rotation of the AC servo motor 64, Backlash can be removed. Thereby, the rotation of the turntable 7 and the positioning when stopped can be performed with higher precision.

When the pair of opening/closing molds 8.8' come to station F, the pair of chucks 85, 86 of the upper burr gripping/extracting mechanism 81 of the molded product extraction device 80 have already been lowered, so that the pair of opening/closing molds 8.8' The upper burr 2a' of the molded product 2' which protrudes from the upper surface of the molded product 2' and which has been corrected to a flattened state by the burr shape correction mechanism 70 is gripped by each chuck piece 89 of the chuck 85 and the chuck 86. At approximately the same time as this gripping, the mold clamping device 100 is operated by the hydraulic cylinder 115 to open the pair of opening/closing molds 8.8'. Then, when the rod 82a of the air cylinder 82 of the upper burr gripping and extraction mechanism 81 moves out, the pair of chucks 8586 are attracted to the gripping and conveying mechanism 9.
Increase to 0. When the molded product 2' is lifted up by the upper burr gripping and taking-out mechanism 81, as shown in FIG. Upper burr 2a of product 2'
The right lower portions of the pair of chucks 85, 86 of the molded product 2b' are reliably vacuum-sucked, and the body 2b' is securely held by the pair of gripping pieces 97, 97 without shaking the molded product 2'. Next, the arm 91 is rotated by 180 degrees by the motor 92 to release the suction and gripping state, and each of the finished molded products 2' is stored in the molded product storage container 68, respectively.

Opening of the pair of opening/closing molds 88' by the mold clamping device 100 is performed by moving the connecting plate 112 in the opposite direction to the mold clamping (backward movement).

The pivot shaft 107 of the swing lever 105 of this mold clamping device 100 is located below the height of the pair of guide shafts 101, 101, and from this pivot shaft 107, the clamp rod 104'
The distance to the pin pivot point of the intermediate link 108 at the other end;
Intermediate link 11 of slide rod 110 from pivot 107
Since the distance to the pin pivot point 1 is made equal, and the pivot shaft 107 is provided between the position of the pair of guide shafts 101 and the top surface of the base plate 9, the mold clamping force of the mold clamping device 100 is reduced. can be equally divided between the pair of guide shafts 101, 101 and the plywood 9, and no unreasonable load is applied to the plywood 9 or the like. Further, the opened and closed states of the pair of opening/closing molds 8.8' can be reliably maintained by the toggle mechanism 120, which has a simple structure and includes a first link 121, a second link 123, and the like.

In addition, when the screw 16 of the extruder IO is taken out for cleaning after the blow molding is completed by the rotary blow molding machine 1, the extruder 1 The extruder main body 13 can be rotated by a predetermined angle by a rotation drive mechanism 20. This prevents the extruder main body 13 from interfering with the mold clamping device 100 and the like, making it easier to clean the screws 16 and the like. Further, since the extruder main body 13 is of a rotating type, the installation space of the rotary blow molding machine 1 can be saved.

According to the embodiment, the extruder 10 of the rotary blow molding machine 1 is connected to the pair of hinges 31.3 by the vertical drive mechanism 30.
Although the extruder 10 is configured to be movable up and down centering on the extruder 10, the extruder 10 is not limited to this, and an extruder 10 of another embodiment shown in FIG.
', the position of the pair of hinges 31', 31' is inverted V.
The height of the die head 19 may be set to the height of the die head (on the same horizontal plane) via the letter-shaped frame 3. This makes it possible to reliably solve problems such as vibration of the gouging head 19 and misalignment of the parison 2. Note that other configurations are the same as those in the previous embodiment, so the same reference numerals are given and detailed explanations are omitted.

〔Effect of the invention〕

As described above, according to the present invention, in a rotary blow molding machine, the annular driven gear provided on the turntable and the drive gear that transmits the rotation of the motor are interposed, and the gear is engaged with both gears. A pair of idle gears can eliminate bank lash between each gear. Thereby, the turntable can be positioned with higher precision.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a rotary blow molding machine showing an embodiment of the present invention, Fig. 2 is a side view of an extruder of the blow molding machine, Fig. 3 is a front view of the extruder, and Fig. 4 is a rear view of the same extruder,
Figure 5 is a plan view of the parison cutting device of the same blow molding machine;
Figure 6 is a sectional view taken along the line ■-■ in Figure 5, Figure 7 is a side view showing a part of the parison cutting device in cross section, and Figure 8 is a side view of the mold clamping device of the blow molding machine. , FIG. 9 is a front view of the burr shape correction mechanism of the same blow molding machine, FIG. 10 is a plan view of the burr shape correction mechanism of the same blow molding machine, FIG. Figure 1 is a side view of the upper burr gripping and extraction mechanism of the molded product extraction device of the same blow molding machine, Figure 13 is a sectional view taken along the xm-xm line in Figure 12, and Figure 14 is a front view of the upper burr gripping and extraction mechanism of the same blow molding machine. 15 is a plan view of the suction gripping and conveying mechanism of the molded product take-out device, FIG. 16 is a side view of the suction gripping and conveying mechanism, FIG. 17 is a front view of the suction gripping and conveying mechanism, and FIG. FIG. 19 is an enlarged side view of the mold clamping device of the same blow molding machine, and FIG. 19 is a side view of the extruder of another embodiment. 1...Rotary blow molding machine, 2...(melting) parison, 7...turntable, 8.8'...(pair of open/close) molds, 10...extruder, 61...・Driven gear,
62°62...Pair of idle gears, 65...Motor, 66...Drive gear. Figure 3 T'-=='T Figure 4 Figure 12 Figure 13

Claims (1)

[Claims] (1) A rotary type in which a turntable is installed below the extruder that extrudes the parison, and a turntable is mounted with a plurality of molds for sandwiching and blow-molding the parison, and this turntable is rotated by a motor. The blow molding machine is characterized in that the turntable is provided with an annular driven gear, and a pair of idle gears that mesh with both gears are interposed between the driven gear and a drive gear that transmits the rotation of the motor. rotary blow molding machine.