JPH0418325A - Molding die for blow molding - Google Patents

Abstract

PURPOSE:To realize the opening-closing drive of molding-die half sections positively, smoothly and rapidly by sharing the driving source of the locking/release motions of the molding-die half sections with a driving source conducting a rocking motion while opening and closing the two molding-die half sections by rocking and harmoniously controlling two different motions. CONSTITUTION:A molding die is mainly composed of first and second molding- die half sections 1, 2 and a bottom mold 3. The bottom mold 3 intrudes to sections upper than the lower ends 4 of the first and second mutually joined molding-die half sections 1, 2. The molding-die half sections 1, 2 are supported relatively in a rockable manner centering around a common rocking shaft 5. A locking device 6 for the first and second molding-die half sections 1, 2 is installed on the rectilinear diameter of the rocking shaft 5 and on the side facing the rocking shaft 5, and the first and second molding-die half sections 1, 2 are locked mutually by the locking device 6. The first and second molding- die half sections 1, 2 form an internal chamber 7 under the state, and a hollow body 8 is manufactured through an orienting blow molding method from a preform in the internal chamber 7.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to two mold halves that can be swung around a common swiveling wheel and that form an internal chamber for forming a hollow body, and a locking device that locks the mold half in a closed state;
The present invention relates to a mold for blow molding.

[Prior Art and Problems to be Solved by the Invention] A stretch blow molding machine using this type of mold is disclosed in West German Patent No. 3336071 and Japanese Unexamined Patent Publication No. 1101137. Such a mold that can be opened and closed by swinging allows the preform to be quickly inserted into the mold by swinging the two mold halves in close proximity, and can be emptied again by swinging apart after the molding process. , which is advantageous in shortening the molding cycle.

The fast operation of the stretch-blow molding machine achieved in this way is exclusive to each movement process, i.e. the close rocking of the mold halves for the closing of the mold, the locking drive and the forming for the opening of the mold. It depends on the speed at which the unlocking drive of the mold half and the #L interval swinging drive proceed.

In the device disclosed in the above-mentioned publication, the swinging drive of the two mold halves and the locking/unlocking drive thereof are performed by transmission of driving force from separate drive sources. In this case, it is particularly difficult to harmonize the individual operating processes, i.e. in particular the close rocking of the mold halves and the subsequent locking of the mold, the unlocking of the mold halves and the subsequent swinging away. It was difficult to harmonize the

It is an object of the present invention to harmonize the two types of movement, the close rocking motion and the locking drive, necessary for closing the two mold halves, and the unlocking drive and the separation motion necessary for opening the two mold halves. It is an object of the present invention to provide a mold for blow molding that can harmonize two types of rocking motion and realize smooth and quick opening/closing driving of the mold.

[Means for Solving the Problems and Their Effects] According to the present invention, this object is particularly achieved in the first aspect. Proximity rocking drive of the second mold half, subsequent locking drive of the locking member, unlocking drive of the locking member, and subsequent first. This is achieved by providing a mold drive control mechanism that controls the separation swing drive of the second mold half by receiving driving force transmitted from one drive source.

This mold drive control mechanism operates based on the driving force of one driving source, so the swinging motion of the mold half and the locking/unlocking motion of the locking member are reliably performed at predetermined timings. Moreover, it can be controlled so that it is carried out smoothly and quickly. In this way, the interrelated control processes are carried out in an optimal sequence, and undesirable combinations of movement processes and interferences can be prevented.

This mold drive control mechanism includes a control slider that is reciprocated by a drive source, a control cam for mold opening/closing drive formed on the control surface of the control slider, and a locking/unlocking drive formed on the control surface of the control slider. a control cam for mold opening/closing, a cam follower for mold opening/closing driving which generates an operating force for swinging the first and second mold halves towards each other and swinging them apart by being driven by the mold opening/closing driving control cam, and a chain. A locking/unlocking drive cam follower that generates an operating force to move the locking member in the locking direction and the unlocking direction by following the locking/unlocking drive control cam. Mechanical engagement ensures reliable operation.

The control surface of the control slider on which the mold opening/closing control cam is formed is provided at a position concentrically surrounding the swing axis, thereby making the device compact. In this case, the mold opening/closing control cams are formed as a first cam and a second cam for respectively rocking the first and second mold halves, and the first and second cams are 1st. When the second mold half swings apart, it has the smallest spacing; Second
The mold halves of the two mold halves are formed so that when they touch, there is the largest gap between them.

As the locking/unlocking drive mechanism of the locking member, a swinging lever is provided which swings in accordance with the movement of the locking/unlocking drive cam follower, and a swinging end of this swinging lever engages with the locking member. By doing so, the locking member can be slid in the locking direction and the unlocking direction, respectively.

Also, 1st. A bottom mold for molding the bottom wall of the hollow body can be arranged on one end side of the second mold half in the direction of the swinging wheel so as to form a part of the internal chamber. In this case, it is preferable that the bottom mold is connected to a bottom mold drive control mechanism to which the driving force of the drive source is transmitted, so that the bottom mold can be moved up and down along the direction of the swing axis. This movability of the bottom mold greatly expands the types of hollow bodies that can be manufactured inside the mold. For example, with such a bottom mold it is possible to produce a hollow body with a bottom wall that is convex in the direction of its interior chamber. In this case, the bottom mold has a protuberance for forming the bottom wall of the hollow body to be convex inward.

Such a bottom type drive control mechanism has a slider piece that reciprocates together with the control slider, a drive cam formed on this slider piece, and a cam follower that follows this drive cam, and is reversibly rotated by the reciprocating movement of the slider piece. a control cylinder for driving the bottom mold; a control cam for driving the bottom mold formed on a control surface of the control cylinder; A rocking lever for driving the bottom mold, the other end of which moves up and down together with the bottom mold.

Also, the bottom mold and the first. If the second half of the mold is provided with pressing surfaces that are inclined at approximately the same angle, the first half of the mold. When the inner chamber is formed by the second mold half and the bottom mold, the bottom mold can be self-centered by the pressing contact between the pressing surfaces.

[Examples] The present invention will be described in detail below with reference to embodiments shown in the drawings.

As shown in Figures 1 and 2, the molds are mainly used in the first and second molds.
It consists of mold halves 1 and 2 and a bottom mold 3. As shown in FIG. Second
It enters above the lower end 4 of the mold halves 1 and 2. The mold halves 1.degree. 2 are supported so as to be relatively pivotable about a common pivot shaft 5.

A first . A locking device 6 is provided for the second mold halves 1, 2, which locks the second mold halves 1, 2 relative to each other. The second mold halves 1, 2 are locked. In this state, the first.
The second mold half 1.degree. 2 forms an interior chamber 7 in which a hollow body 8 is produced from a preform (not shown) in a stretch-blow molding process. A center line 9 extends vertically through this interior chamber 7 , and the pivot axis 5 extends parallel to this center line 9 .

The bottom mold 3 is fixed to a guide rod 10.11 so that it can be moved in the axial direction of the center line 9. These guide rods10.
11 extends substantially parallel to the centerline 9 and is movably supported by a third bracket 12 . This third
The bracket 12 is fixed to a fixing column 13, to which two other brackets 14, 15 are fixed longitudinally side by side. These brackets 12, 14
15, two tie rods 16, 17 extending parallel to the pivot axis 5 are supported so as to be movable in the longitudinal direction. These tie rods 16, 17 have control sliders 18
is fixed, and this control slider 18 is connected to the piston rod 1
9 to a hydraulic piston 20. This hydraulic piston 20 is supported within a hydraulic cylinder 21 so as to be movable in the longitudinal direction of the piston rod 19. The hydraulic cylinder 21 is fixed to the first bracket 15.

The swing shaft 5 is provided between the first bracket 15 and the second bracket 14, and both ends of the swing shaft 5 are supported by brackets 14.15. The control slide 18 moves between these two brackets 14.15 and is designed to surround the pivot axis 5 concentrically. The control slide 18 has a control surface 22 on its inner side on the side of the pivot axis 5 . Three control cams (cam grooves) 2B, 24.25 extend through this control surface 22 in the longitudinal direction of the control slider 18. A transmission roller 26, 27, 28 is rotatably supported by each of these control cams 2B, 24, 25.

As shown in FIG. 5, the control cams 23, 24 are furthest from each other on the side of the end face 29 of the control slider 18 on the side of the first bracket 15, and the end face 30 of the control slider 18 on the opposite side from that end face 29. closest to each other on the sides. Between these two end faces 29.30, the two control cams 23.24 draw a gentle S shadow line.

The transmission roller 26.27 is guided on its S-shape when the control slide 18 moves along the tie rod 16.17. In this movement of the control slider 18, the transmission rollers 26, 27 are brought closer to each other when the control slider 18 moves from the first bracket 15 to the second bracket 14, and closer to each other when the control slider 18 moves in the opposite direction. be separated.

The transmission rollers 26, 27 are rotatably supported on shafts 31.32 which are attached to a transmission body 35.36 by means of bolt arrangements 33.34, as shown in FIG. These transmission bodies 35, 36 are formed in the form of L-profiles 38 (see FIG. 2), to the short legs 39 of which transmission rollers 26, 27 are attached via bolt devices 3334. long legs 4
0 is attached to the outer surface 41 of the first and second mold halves 1 and 2. In this way, the transmission roller 26.2
7 is transmitted to the first and second mold halves 1, 2 via transmission bodies 35, 36, and the movements of these first and second mold halves 1, 2 are transmitted through transmission bodies 35, 36. The second mold halves 1, 2 are oscillated about the oscillating axis 5 in accordance with the direction of movement of the transmission rollers 26,27. In that case, the control cams 23 and 24 are formed as follows. That is, when the transmission rollers 26 and 27 are on the end surface 29 side (the state shown in FIG. 2), the first. When the second mold halves 1 and 2 have their mutually facing boundary surfaces 42 and 43 pressed together and the transmission rollers 26 and 27 are on the end surface 30 side (the state shown in FIG. 3), the state shown in FIG. As shown, the inner chamber 7 is the first
．． The design is such that it can be completely opened after the oscillating movement of the second mold half 1.2. The groove shape in the middle of the control cams 23 and 24 is the first. This is taken into account by the desired movement course of the second mold halves 1, 2. The first and second mold halves 1, 2 are arranged so that, on the one hand, the interior chamber 7 must be kept sealed until the hollow body 8 assumes its final desired shape, and on the other hand, the interior of the finished hollow body 8 is They must be quickly swung away from each other so that they can be removed from the chamber 7 and a new preform (not shown) is conveyed into the interior chamber 7.

A third control cam 25 extends through the side surface 44 of the control slider 18 following the control surface 22 .

The second side surface 44 extends in the longitudinal direction of the control slide 18 and extends approximately at right angles to the end faces 29,30. As shown in FIG. second mold half 1,
It extends approximately perpendicular to a central plane 45 which extends in the direction of the two oppositely located boundary surfaces 42,43. This central plane 4
5 extends through the centerline 9.

As shown in FIGS. 1 and 6, a coupling lever 46 is swingably coupled to the transmission roller 28 guided by the control cam 25. As shown in FIGS. This connection lever 46 is fixed to one end of a swing shaft 47. The swing shaft 47 is the first. It is guided through the edge region 48 of the second mold half 1.2. This pivot shaft 47 supports a pivot lever 49 at its end opposite the control slide 18 . This swing lever 49 is firmly connected to the swing shaft 47. The rocking lever 49 extends approximately at right angles to the direction of the rocking axis 47 in the direction of the locking device 6 and has an end 50 in the form of a hook 51 opposite the rocking axis 47.
is engaged with a locking rod 52 as a locking member.

As shown in FIG. 7, one second mold half 2 has
Ring members 58.degree. 58 are provided on the side facing the swing shaft 5 and spaced apart from each other in the vertical direction. The other first mold half 1
On the side facing the swing shaft 5, cutout ring members 57°57 as locked members are provided vertically apart from each other. The ring member 58 is provided with an opening 56 having a circular cross section, and the notched ring member 57 is provided with an opening 55 having a circular cross section in which an arcuate notch 55a is formed, as shown in FIG. These apertures 55,56 have two first .
When the boundary surfaces 42 and 43 of the second mold halves 1 and 2 come into contact, they overlap on a - straight line. The locking rod 52 has a circular cross section corresponding to the opening 5556;
It is inserted and supported in an opening 56 of one mold half 2 so as to be movable up and down. The locking rod 52 has a cylindrical portion 59°60.
61,62, and between the cylindrical parts 59 and 60 and 61 and 62 there are connecting members 63,64 which have non-cylindrical parts 65,66. Here, the arc-shaped notch 55a provided in the notch ring member 57 has a size corresponding to the non-cylindrical portion 65.

Therefore, the first. When the second mold halves 1, 2 are swung toward each other, the locking rod 52 is received by the cutout ring element 57 in the area of the non-cylindrical part 65, 66. For this purpose, the notch 55a is provided in a region 77 where the end of the mold half 1 opposite to the pivot shaft 5 transitions into the notch ring member 57 (seventh
(see figure).

Furthermore, there is a connecting member 67 between the cylindrical portions 60, 61;
This connecting member 67 has a connecting portion 68 which is narrower than the cylindrical portion 60°61. This connecting part 68 is compared to the cylindrical part 60.61 and has a transmission roller 69 there.
It is thin enough to support. This transmission roller 6
9 is rotatably supported by the tip 50 of the swing lever 49. The transmission roller 69 has a roller surface 70 in contact with an end surface 71 bounding the cylindrical portion 60 on the one hand, and a transmission member 72 on the other hand. This transmission element 72 bounds the connecting part 68 on the side opposite the end face 71 . As the tip 50 of the swing lever 49 swings up and down in this manner, the locking rod 52 is moved in the axial direction of its longitudinal axis 73 by the transmission roller 69.

The cutout ring member 57 has a U-shape and is composed of leg portions 78 and 79 on both sides and a yoke 80 that connects the leg portions 78 and 79. In the closed state of the internal chamber 7, the legs 78.7 on both sides
9 covers the -1 lower end surface side of the ring member 58. Since these two legs 78, 79 are connected to each other by a yoke 80, the cutout ring member 57 has great strength. Therefore, even when the locking rod 52 extends through the opening 56 of the ring member 58 and the opening 55 of the notched ring member 57, the notched ring member 57
deformation is prevented.

When the internal chamber 7 is closed, the lock door 52
The cylindrical parts 59.60, 61.62 are the leg parts 78.79
The opening 55 extends through the opening 55 . In that case, the cylindrical portions 59, 60, 61°62 extend beyond the legs 78.79 in the direction of the opening 56 of the ring member 58 inserted between the two legs 78.79. 60,6
Ko.

62 protrudes to the extent that it is firmly inserted into the openings 56 and 55.

In order to open the internal chamber 7, the locking rod 52 is moved in the axial direction of its longitudinal axis 73 toward the bottom mold 3 by the swinging of the swinging lever 49 and according to the action of the transmission roller 69. Ru. As a result, the cylindrical portions 59, 60, 61 .
The locking rod 52 is moved such that the locking rod 62 is only in the area of the opening 56 of the ring member 58. At this time, these non-cylindrical portions 65 and 66 are connected to the notch ring member 57.
The locking rod 52 can be removed from the locking rod 52. The coupling elements 63 , 64 formed with non-cylindrical parts 65 , 66 are each located in the area of two legs 79 of the cutout ring element 57 . At this time, the locking rod 52 is removed from the upper leg 78, and the transmission member 72 of the locking rod 52 is located within the lower leg 78.

In this way, the locking device 6 is locked in one swinging position of the swinging lever 49, and unlocked in the other swinging position. The swing lever 49 swings while giving a twist to the swing shaft 47. This movement is caused by the movement of the transmission roller 28 within the control cam 25.

This movement is effected by the S-shaped design of the control cam 25 from the unlocking position of the locking device 6 in the area of the end face 29 to the locking position located below the end face 29. . In this process, the transmission roller 28 is moved from a starting position W181 within the end face 29 shown in FIG. 5 to a final position 82.

1st. In addition to the second mold halves 1, 2 and the locking device 6, the liftable bottom mold 3 is also controlled in relation to its movement by a control slide 18. For this purpose, as shown in FIG. 8, a lifting member 84 as a slider piece is fixed to the lifting tie rod 16, 17. and,
A transmission roller 85 is rotatably attached to this elevating member 84. On the other hand, a shaft 87 is provided between the second bracket 14 and the third bracket 12, and this shaft 87
A control cylinder 86 is rotatably supported. This #J palm cylinder 86 has a cylindrical surface 88, and two control cams 89a, 89b and a cam follower 90 are grooved on this surface 88, as shown in FIGS. 8 and 9, respectively.

In the cam follower 90, a transmission roller 85 that is rotatable with respect to the elevating member 84 is engaged. And the elevating member 84
According to the vertical movement of the control cylinder 86, the control cylinder 86 is reversibly rotated while the transmission roller 85 as a drive cam drives the cam follower 90.

The control cams 89a and 89b swing the double-arm lever 91 to raise and lower the bottom mold 3 when the control cylinder 86 is rotated on the shaft 87 by the movement of the lifting member 84. In this case, the control cams 89a, 89b are designed in such a way that they are precisely adapted to the respective desired movement course of the bottom mold 3.

The double-arm lever 91 is fixed to a swing shaft 92 rotatably supported by the second bracket 14. The double-arm lever 91 includes a pair of first arms 91a extending on both sides of the control cylinder 88, and a pair of second arms 91a extending below the bottom mold 3.
It is composed of arms 91b, 91b. The swing shaft 92 is fixed to the base end side of a pair of first arms 91a, 91a, and the control cam 8 of the control cylinder 88 is attached to the front end side of the swing shaft 92.
Transmission rollers 93 and 93 that engage with 9a and 89b are rotatably supported. On the other hand, a pair of second arms 91b
, 91b, a transmission roller 98 is rotatably supported at the tip side. This transmission roller 98 is located between two blocks 95, 96 which are spaced apart and fixed to a guide rod 10, 11 which moves up and down together with the bottom mold 3. Between these two blocks 95 and 96, there are provided members (not shown) that contact the transmission roller 98 on the upper and lower sides. Therefore, this transmission roller 98 moves the bottom die 3 to the first position in response to the swinging movement performed by the double-arm lever 91. Either the bottom mold half 3 is moved towards the second mold half 1, 2 or the bottom mold half 3 is moved towards the second mold half 1, 2. The second mold halves 1, 2 are moved in a direction further away from each other. Bottom mold 3
Since the movement is performed in relation to the shape of the control cams 89a, 89b, the bottom mold 3 can be moved at a very high speed.

When the bottom mold 3 is driven upward, the first. Second mold half 1
, 2 into the fitting opening 99 formed by the first . Together with the second mold halves 1, 2, an internal chamber 7 is formed. At this time, the control cam 89a.

The shape of 89b also allows the bottom mold 3 to be inserted into the mating opening 99 at a very slow speed. In this way, it is prevented that the fitting opening 99 is destroyed when inserting the bottom mold 3. This fitting opening 99 is formed by an inclined pressing surface 10 provided on the bottom mold 3 side as shown in FIG.
0 and a pressing surface 101 provided on the mold half side and having an inclined surface of the same angle come into surface contact with each other, thereby enabling self-centering of the bottom mold 3. And the first. When the internal chamber 7 is closed by the approximation movement carried out by the second mold halves 1, 2, one pressing surface 101
Self-centering is achieved by pressing 00 pressure-tightly.

1st. The second mold halves 1, 2 each have a cutout ring member 57. Support frame 1 connecting ring member 58
02,103 has been loaned. These support frames 1
Built-in parts 104 and 105 are installed inside the parts 02 and 103, and the internal chamber 7
is formed. Depending on the shape of the hollow body 8 to be manufactured, various integrations 104, 105 are installed in the support frame 102.
It can be attached to ゜103. A mold member 106 corresponding to the shape of the bottom mold 3 is also attached to the bottom mold 3. In that case, this mold member 106 has a bulge convex in the direction of the internal chamber 7, since the bottom mold 3 is removed from the first and second mold halves 1, 2 in order to remove the finished hollow body 8 from the mold. 107 can be formed, and a concave bottom structure of the hollow container 8 can be realized. Therefore, it is advantageous when producing a highly stable bottle with hollow legs.

Next, the overall operation of this mold will be explained.

When the control slider 18 is drawn near the first bracket 15 by the piston rod 19, the first . The second mold halves 1, 2 are spaced apart from each other, thereby opening the interior chamber 7. In this position, the preform (
(not shown) is inserted into the internal chamber 7.

Subsequently, pressure is supplied to the hydraulic cylinder 21,
Piston rod 19 moves control slide 18 in the direction of second bracket 14 . In that case, the transmission roller 26
, 27 are slid by means of the control cam 2324 and are thereby moved away from each other. This movement is performed as a rocking motion around the rocking shaft 50, and this rocking motion causes the first. Second
The mold halves 1, 2 are swung close together until their interface surfaces 42, 43 abut each other. Also, the locking rod 52 supported by the ring member 56 of the second mold half 2 is inserted through the notch 55a of the notch ring member 55 of the other first mold half 1. , notch ring member 5
Uke is accepted within 5. Two first. When the interface surfaces 42.43 of the second mold halves 1, 2 touch, the cutout ring member 55. The openings 57, 58 in the ring member 56 are aligned and the locking rod 52 is moved into its locking position by the swinging of the swinging lever 49.

At the same time, the lifting member 84 is lowered together with the tie rods 16, 17, and due to the engagement of the transmission roller 85 as a drive cam and the cam follower 90, the control cylinder 86 is moved to its shaft 87.
It is rotated around. In that case, the transmission roller 93 supported by the pair of first arms 91a, 91a of the double-arm lever 91 moves within the control cams 89a, 89b,
At this time, the double-arm lever 91 is swung. In this way,
A transmission roller 98 provided at the tips of the pair of second arms 91b, 91b moves the bottom mold 3 into the first and second positions until the bottom mold 3 is inserted into the fitting opening 99. Move in the direction of the second mold half 1.2. This exercise is the first. Second mold half 1
, 2 simultaneously, so that at the end of the linear movement carried out by the control slide 18, the internal chamber 7 moves to the first . It is surrounded by the second mold half 1, 2 as well as the bottom 3.

After the hollow body 8 has been formed, the control slide 18 is moved back in the direction of the bracket 15 by means of the piston rod 19, so that all movement processes proceed in the opposite direction based on the respective cam control. In this way, each moving part does not interfere with each other when performing its movement and nevertheless the internal chamber 7
It is ensured that the respective movement courses operate in unison so that a rapid opening of the motor takes place.

[Effects of the Invention] As explained above, according to the present invention, even though the two mold halves are opened and closed by rocking, the locking/unlocking movement of the mold halves, which is essential for this type of mold, can be avoided. By sharing the drive source with the drive source for swinging motion and controlling the two different motions in harmony, it is possible to reliably, smoothly, and quickly realize opening and closing of the mold halves.

[Brief explanation of the drawing]

Figure 1 is a plan view of a mold according to an embodiment of the present invention in a closed state, Figure 2 is a side view of a closed mold, Figure 3 is a side view of an open mold, and Figure 4 is an open mold. Fig. 5 is a developed view of the control surface of the control slider seen from the direction of the arrow ■ in Fig. 1; Fig. 6 is a cross-sectional view taken along the line ■-■ in Fig. 1; 7 is a cross-sectional view taken along the line ■--■ in FIG. 1, FIG. 8 is a cross-sectional view taken along the line IV--IV in FIG. 2, and FIG. 9 is a developed view of the control cylinder. DESCRIPTION OF SYMBOLS 1... First mold half part, 2... Second mold half part, 3... Bottom mold, 5... Swing shaft, 7... Internal chamber, 8
...Hollow body, 18...Control slider, 19,20.
21... Drive source, 23.24... Control cam for mold opening/closing drive, 25... Cam for locking/unlocking drive control, 26.2
7... Cam follower for driving mold opening/closing, 28... Locking/
Cam follower for unlocking drive, 42.43...boundary surface, 4
9... Swinging leno<-52... Locking member, 57...
Locked member, 84...Slider piece, 85...Drive cam, 86...Control cylinder, 89a, 89b...Control cam for bottom mold drive, 90...
Cam follower, 91... Swinging lever for bottom type drive 93... Cam follower, 100° 107... Protuberance. 101...pressure surface,

Claims (8)

[Claims] (1) First and second mold halves that swing around a swing axis and whose boundary surfaces contact each other to form an internal chamber for blow molding a hollow body; and the first mold half. a locked member provided at an end facing the swing axis and locked to the second mold half after the boundary surface comes into contact with the second mold half; movably supported at an end opposite to the swing axis;
a locking member that locks the locking member of the first mold half after the boundary surfaces come into contact with each other, and unlocks the locked member before the boundary surface is opened; , a close rocking drive of the second mold half, a subsequent locking drive of the locking member, an unlocking drive of the locking member, and a subsequent separation of the first and second mold halves. A mold for blow molding, comprising: a mold drive control mechanism that controls the swing drive and the swing drive by receiving driving force transmitted from a single drive source. (2) In claim (1), the mold drive control mechanism includes: a control slider that is reciprocated by the drive source; a control cam for mold opening/closing drive formed on a control surface of the control slider; By following the locking/unlocking drive control cam formed on the control surface and the mold opening/closing drive control cam, the first
, a mold opening/closing driving cam follower that generates an operating force for swinging the second mold half toward each other and away from each other; A mold for blow molding, comprising: a locking/unlocking drive cam follower that generates an operating force to move the locking/unlocking device in the locking direction and the unlocking direction. (3) In claim (2), the control surface of the control slider on which the mold opening/closing control cam is formed is provided in a position concentrically surrounding the swing axis, and the mold opening/closing control cam is They are formed as a first cam and a second cam for respectively rocking the first and second mold halves, and the first and second cams are connected to the first and second mold halves. The mold halves are formed to have the smallest interval when they are swung apart, and to have the largest interval when the boundary surfaces of the first and second mold halves are in contact with each other. A mold for blow molding. (4) In any one of claims (1) to (3), a swinging lever is provided that swings in accordance with the locking/unlocking driving cam follower, and the swinging end of the swinging lever is A mold for blow molding, characterized in that the locking member slides in a locking direction and an unlocking direction by engaging with the locking member. (5) In any one of claims (1) to (4), one end of the first and second mold halves in the swing axis direction is provided with a mold for molding the bottom of the hollow body. a bottom mold is arranged to form a part of the interior chamber, and the bottom mold
A mold for blow molding, characterized in that the mold is connected to a bottom mold drive control mechanism to which the driving force of the driving source is transmitted, and is movable up and down along the direction of the swing axis. (6) The mold for blow molding according to claim (5), wherein the bottom mold has a protuberance for forming the bottom wall of the hollow body to be convex inward. (7) In claim (5) or (6), the bottom type drive control mechanism includes a slider piece that reciprocates together with the control slider, a drive cam formed on the slider piece, and a cam follower that follows the drive cam. a control cylinder which is reversibly rotated by the reciprocating movement of the slider piece; a control cam for driving the bottom mold formed on the control surface of the control cylinder; a swinging fulcrum in the middle part; A mold for blow molding, comprising: a cam follower driven by a control cam for driving the bottom mold; and a rocking lever for driving the bottom mold, the other end of which moves up and down together with the bottom mold. (8) In any one of claims (5) to (7), the bottom mold and the first and second mold halves are each provided with a pressing surface that is inclined at approximately the same angle, Said first
, when the internal chamber is formed by the second mold half and the bottom mold, self-centering of the bottom mold is performed by pressing contact between the pressing surfaces. Molding mold.