CN101053992B

CN101053992B - Biaxial stretch blow molding machine

Info

Publication number: CN101053992B
Application number: CN2006100819776A
Authority: CN
Inventors: 祢津阳一
Original assignee: Frontier Co Ltd
Current assignee: Frontier Ind Inc; Frontier Co Ltd
Priority date: 2006-04-10
Filing date: 2006-05-12
Publication date: 2010-10-06
Anticipated expiration: 2026-05-12
Also published as: TW200738435A; HK1111382A1; TWI268851B; JP2007276327A; CN101053992A

Abstract

Two preform carriers 12 arriving at positions 31 and 32 with a first feeding pitch p1 via heating parts 4 or 3 of the biaxial stretching blow molding machine 1 are fed to molding positions 33 and 34 with a wide feeding pitch p2 by a pitch enlarging mechanism 14. The pitch enlarging mechanism 14 is provided with a front side holding plate 41 and a rear side holding plate 42, and when it sends out the front side holding plate 41 with two-times larger pitch of the second feeding pitch, a first holding groove 51 and a second holding groove 52 formed with the interval of the second feeding pitch are positioned at molding discharge positions 35 and 36. The rear side holding plate 42 is sent out on the midway of sending action while being integrated with the front side holding plate 41, and they are positioned at the molding positions 33 and 34 in the state where the interval between a third holding groove 53 of the front side holding plate 41 and a fourth holding groove 54 of the rear side holding plate 42 is the second feeding pitch. The invention provides a biaxial stretching blow molding machine which can efficiently perform feeding pitch enlarging action, preform feeding action and molding discharge action.

Description

Biaxial stretch blow molding machine

Technical field

The present invention relates to biaxial stretch blow molding machine, it is along by the conveyance path of heating part and extension forming section the preform bearing that supports preform being carried out conveyance, preform is implemented biaxial stretch blow molding successively, make the drip molding of regulation shape.

Utilize the biaxial stretch blow molding mode to make the biaxial stretch blow molding machine of resin molded parts such as PET bottle, its formation is, the half form spare that will be called preform is carrying out the conveyance heating to the temperature that is suitable for being shaped by the heating part, then in constituting the finishing die that extends forming section, preform is implemented biaxial stretch blow molding.

The formation of typical biaxial stretch blow molding machine is, have preform supply unit, preform heating part, extend forming section and drip molding discharge portion, make a plurality of preform bearing circulations along the guide rail that the conveyance path by these various pieces is limited continuously or off and on.In addition, typical preform bearing has: the sliding part that moves along guide rail; With the core that inserts usefulness from the outstanding preform of this sliding part.

Preform is, in the preform supply unit, ground is installed in state on the core of preform bearing by each preform bearing support with its oral area.In addition, in extending forming section,, in the drip molding discharge portion, break away from each preform bearing and be recycled to the recovery place of regulation by preform is carried out the drip molding that biaxial stretch blow molding obtains.In addition, become each empty preform bearing behind the discharge drip molding and turn back to the preform supply unit again, support new preform.

So, supporting preform by preform bearing and carrying out in the biaxial stretch blow molding machine of structure of biaxial stretch blow molding along certain continuous conveyance of circulating path, in order to improve economy, press for the responsiveness that improves each several part, improve whole disposal ability.

Here, along circulating path by the preform of preform bearing institute conveyance extending forming section by biaxial stretch blow molding, make the bigger drip molding of width and height dimension.Therefore, the pitch of feed of preform bearing must be enlarged in the front of extending forming section.Move and move if can carry out the conversion of such pitch of feed effectively, then can improve the processing speed that twin shaft extends forming machine with the conveyance of the wide preform bearing that pitch of feed was carried out.

As the finishing die that is used for preform is carried out biaxial stretch blow molding, a pair of die opening and closing that opens and closes about general the use.If can effectively utilize a pair of die opening and closing is opened and closed the clamping of usefulness and die opening and closing is carried out on-off action, then can improve the processing speed that twin shaft extends forming machine.

Summary of the invention

In view of the above problems, the object of the present invention is to provide a kind of biaxial stretch blow molding machine that processing speed is accelerated by the high efficiency that each mechanism is partly moved.

In detail, the object of the present invention is to provide a kind of like this biaxial stretch blow molding machine: the conveyance action of the preform bearing that can extend the expansion action of the pitch of feed of the preform bearing in front of the forming section efficiently, carries out with the pitch of feed after enlarging.

The object of the present invention is to provide a kind of biaxial stretch blow molding machine of action of clamping of the finishing die that can be used to carry out biaxial stretch blow molding efficiently in addition.

For achieving the above object, biaxial stretch blow molding machine of the present invention is, along carrying channel the preform bearing that supports preform is carried out conveyance by heating part and extension forming section, each preform to the shaping position that is sent to 2 positions of extending forming section carries out biaxial stretch blow molding simultaneously, each 2 drip moldings that are configured as the regulation shape, be characterized in

Has pitch enlargement mechanism, it is used for and will arrives the preform bearing of the position, front of described extension forming section with the 1st pitch of feed conveyance along described carrying channel, be sent to each shaping position with the 2nd pitch of feed more roomy than the 1st pitch of feed, and still pass out to the drip molding drain position from each shaping position with the 2nd pitch of feed

This pitch enlargement mechanism has:

Front side retaining member, this front side retaining member have with the 2nd pitch of feed identical distance configuration, the 1st, the 2nd and the 3rd maintaining part from keeping the preform bearing with the direction of described carrying channel quadrature;

Rear side retaining member, this rear side retaining member have relative front side retaining member and are configured in rear side, the 4th maintaining part from keeping the preform bearing with the direction of described carrying channel quadrature of preform conveyance direction;

Driving and reversing mechanism, this driving and reversing mechanism make front side retaining member and rear side retaining member along and the direction of described carrying channel quadrature and in the holding position that can keep the preform bearing with leave between the yielding position of described carrying channel and advance and retreat;

Supporting device, this supporting device supports front side retaining member and rear side retaining member with the state that can slide to the fore-and-aft direction of described carrying channel;

Feed mechanism, this feed mechanism make the front side retaining member along the direction of described carrying channel and move back and forth between initial position and the launching position sent with at least 2 times distance of the 2nd pitch of feed from this initial position;

Link gear, after this link gear is sent the front side retaining member with the 2nd pitch of feed from described initial position, the rear side retaining member is sent with this front side retaining member from this initial position, after the front side retaining member being returned ormal weight from described launching position, the rear side retaining member is returned with this front side retaining member from this launching position, make the interlock of these front side retaining members and rear side retaining member thus

In described front side and the rear side retaining member be positioned in respectively under the state of initial position, the described the 3rd and the interval of the 4th maintaining part identical with the 1st pitch of feed.

Here, in the present invention, the 3rd block that preferably has the 1st block that the initial position to front side retaining member and rear side retaining member limits, the 2nd block that the launching position of front side retaining member is limited and the launching position of rear side retaining member is limited.

Pitch enlargement mechanism in the biaxial stretch blow molding machine of the present invention is performed as follows the expansion action of pitch of feed.

At first, in advance front side retaining member and rear side retaining member are positioned at initial position separately and make a concession the position.After utilizing driving and reversing mechanism to make front side and rear side retaining member advance to separately holding position, to the oral area that extends the preform that 2 preform bearings of position are supported in front of the forming section, become respectively the state that the 4th maintaining part by the 3rd maintaining part of front side retaining member and rear side retaining member is kept by the 1st pitch of feed conveyance.Simultaneously, be positioned at the oral area of the drip molding that the preform bearing of the shaping position of each finishing die supported, become the state that is kept by the 1st and the 2nd maintaining part in the retaining member of front side.

Under this state, utilize feed mechanism the front side retaining member to be sent with at least 2 times amount of the 2nd pitch of feed.That is, the interval of the 4th maintaining part of the 3rd maintaining part of front side retaining member and rear side retaining member is sent with the state that is extended to the 2nd pitch of feed from the 1st pitch of feed.When the front side retaining member was sent 2 times of the 2nd pitch of feed, the preform bearing that is kept by the 4th maintaining part of the 3rd maintaining part of this front side retaining member and rear side retaining member was positioned on each shaping position.Meanwhile, each drip molding that is kept by the 1st and the 2nd maintaining part in the retaining member of front side is positioned in the drip molding drain position respectively.

Then, after utilizing driving and reversing mechanism that front side and rear side retaining member are made a concession, utilize feed mechanism that they are turned back to initial position.

By this action repeatedly, can be sent to each shaping position off and on simultaneously with enlarging on one side to the 2nd pitch of feed to the preform that extends position, forming section front on one side, the drip molding that is positioned at each shaping position can be passed out to the drip molding drain position successively by the 1st pitch of feed conveyance.

In the biaxial stretch blow molding machine of this structure, the pitch enlargement of utilizing feed mechanism and link gear to carry out preform is simultaneously moved, by the pitch of feed after enlarging the action of shaping position, the action with each drip molding from the shaping position conveyance to the drip molding drain position is arrived in each preform conveyance.Therefore, can carry out spacing conversion action rapidly, help improving the processing speed of biaxial stretch blow molding machine.

In addition, front side retaining member and rear side retaining member are positioned in these initial positions and supplying position reliably by the 1st to the 3rd block.So, can precision well and reliably carry out spacing conversion action.

Then, biaxial stretch blow molding machine of the present invention is, along carrying channel the preform bearing that supports preform is carried out conveyance by heating part and extension forming section, each preform to the shaping position that is sent to 2 positions of extending forming section carries out biaxial stretch blow molding simultaneously, each 2 ground are configured as the drip molding of regulation shape, be characterized in

Described extension forming section have to a pair of die opening and closing that laterally opens and closes of described preform conveyance direction quadrature,

The clamping that these a pair of die opening and closing are opened and closed usefulness has:

Make a side die opening and closing move to the 1st elbow-bar mechanism that its open position and closing position are used; Make the opposing party's die opening and closing move to the 2nd elbow-bar mechanism that its open position and closing position are used; Make in these the 1st and the 2nd elbow-bar mechanism the swing mechanism of rod connection point synchronization lifting separately,

This swing mechanism has:

With the oscillation center line with described carrying channel quadrature is the pair of right and left oscillating structural member that the center can swing up and down;

The left and right sides connecting elements that the end of the same side of each oscillating structural member is connected with each rod connection point of the described the 1st and the 2nd elbow-bar mechanism respectively;

The cylinder of the swing usefulness that is connected with the end of each oscillating structural member opposition side.

In the clamping of this structure, owing to the die sinking action and the mould assembling action of a pair of die opening and closing are carried out fully synchronously, so can carry out these actions smoothly and efficiently.Its result can improve the processing speed of biaxial stretch blow molding machine.In addition, the swing mechanism that the rod connection point lifting of the 1st and the 2nd elbow-bar mechanism is used is configured in along the direction in conveyance path, and the lower side space in conveyance path can be used as the space is set.So the size that can suppress the biaxial stretch blow molding machine width increases, and helps the miniaturization of biaxial stretch blow molding machine.

As mentioned above, adopt biaxial stretch blow molding machine of the present invention, can obtain in the pitch of feed expansion action of the preform that extends forming section with in the die sinking of the die opening and closing of extending forming section, the high efficiency of mould assembling action.So, adopt the present invention, can realize the biaxial stretch blow molding machine that processing speed is accelerated.

Description of drawings

Fig. 1 is an approximate vertical view of having used biaxial stretch blow molding machine of the present invention.

Fig. 2 is the summary side elevation of the biaxial stretch blow molding machine of Fig. 1.

Fig. 3 is the summary construction diagram of extension forming section of the biaxial stretch blow molding machine of Fig. 1.

Fig. 4 is the key diagram of explanation preform, preform bearing and drip molding.

Fig. 5 (a)～(c) is approximate vertical view, summary side elevation and the summary end view drawing of expression pitch enlargement mechanism.

Fig. 6 is the key diagram of the launching position of expression pitch enlargement mechanism.

It (b) is approximate vertical view and the summary side elevation that clamping in the forming section is extended in expression that Fig. 7 (a) reaches.

Fig. 8 sees the summary end view drawing that clamping obtains from preform conveyance direction.

It (b) is the approximate vertical view and the summary side elevation of expression swing mechanism that Fig. 9 (a) reaches.

Figure 10 is from seeing the summary construction diagram that swing mechanism obtains with the direction of carrying channel quadrature.

The specific embodiment

Below, used the biaxial stretch blow molding machine of PET bottle manufacturing usefulness of the present invention with reference to description of drawings.

(overall structure and action)

Fig. 1, Fig. 2 and Fig. 3 are approximate vertical view, the summary side elevation of this routine biaxial stretch blow molding machine and the summary construction diagram that extends forming section.Describe referring now to these accompanying drawings.Biaxial stretch blow molding machine 1 has the pallet framework 2 of growing crosswise, in this top position above pallet framework 2, dispose the extension forming section 6 of preform supply unit 3, preform heating part 4 (1)～4 (3), preform 5 and the drip molding discharge portion 8 that is used to take out drip molding 7.Carry the preform bearing 12 that preform 5 is supported along carrying channel 11, will become empty preform 5 via drip molding discharge portion 8 and turn back to preform supply unit 3 again along the recovery road 13 of linearity via the linearity of these each several parts.Carrying channel 11 and reclaim road 13 configured in parallel at certain intervals in the horizontal direction in addition, reclaims road 13 and is configured in position than carrying channel 11 low one decks.These carrying channels 11 and reclaim road 13 and limited by the pair of guide rails of configured in parallel at certain intervals respectively.

In preform supply unit 3, from reclaiming 2 preform bearings 12 of road 13 each acceptance, preform 5 is bearing on them with handstand state, preform bearing 12 each 2 ground that supporting preform 5 are given the carrying channel 11 of linearity.

Give the preform bearing 12 of carrying channel 11, forwards release successively with the 1st pitch of feed along this carrying channel 11, and be heated by heating part 4 (1)～4 (3) successively.Make the preform that is bearing on the preform bearing 12 5 from the mechanism of migrating disposing on the carrying channel 11, preform 5 rotations on one side are on one side by conveyance, and integral body is heated equably.

Side in carrying channel 11 parts by extending forming section 6 disposes pitch enlargement mechanism 14.Preform bearing 12 via heating part 4 (3) to the position,

front

31,32 of extending forming section 6 utilizes pitch enlargement mechanism 14 to be fed to the shaping position that extends forming section 6 than the 2nd roomy pitch of feed of the 1st pitch of feed.Extend forming section 6 and have 2 finishing dies of taking 61.Pitch enlargement mechanism 14 is sent to preform bearing 12 each 2 ground the shaping position at 2 positions of finishing die 61 respectively simultaneously.

The finishing die 61 that extends forming section 6 have to a pair of die opening and closing that laterally opens and closes 81,82 of preform conveyance conveyance direction quadrature and the bed die 80 that carries out lifting.Die opening and closing 81,82 opens and closes by clamping 63 respectively, and bed die 80 carries out lifting by elevating mechanism 64.In finishing die 61, be bearing in preform 5 on each preform bearing 12 by biaxial stretch blow molding, become the PET bottle (drip molding) 7 of regulation shape.To drip molding is preform bearing 12 that PET bottle 7 supports still passes out to drip molding discharge portion 8 from each

shaping position

33,34 of finishing die 61 by pitch enlargement mechanism 14 with the 2nd roomy pitch of feed drip

molding drain position

35,36.

In drip molding discharge portion 8, will extract by the PET bottle 7 that 2 preform bearings 12 that pass out to the drip molding drain position are supported, be recovered to the recoverer 15 of regulation.Extract 2 preform bearings 12 behind the PET bottle 7 and give the recovery road 13 that the pair of guide rails by linearity limits.Reclaim road 13 and extend to preform supply unit 3 by finishing die 61 downsides that extend forming section 6.

(preform, preform bearing, drip molding)

Fig. 4 is the diagrammatic sketch of expression preform 5, preform bearing 12 and drip molding 7.Preform 5 is to make the PET half form spare of developmental tube shape that an end is the oral area 5a of opening.Preform bearing 12 has cylindric body 12a, is fixed with the lock pin 12c cylindraceous with large diameter flange 12b with coaxial state in the upper end of this cylindric body 12a.The flange 12d of ring-type, the external tooth gear 12e of ring-type and annular plate 12f with this order coaxial state be installed in the downside of the lock pin 12c of cylindric body 12a, and utilize locating snap ring 12g and be fixed into the state do not deviate from.Collar flange 12d is a maximum gauge, and this part plays along carrying out the effect of the sliding part of horizontal slip by carrying channel 11, recovery road 13 that pair of guide rails limited.In addition, the tubular body 12a of this collar flange 12d inboard is made to this collar flange 12d rotation relatively freely, is fixed with the external tooth gear 12e of the ring-type of one rotation on the tubular body 12a.

Though not shown, along the synchronous belt of carrying channel 11 configuration engagement external tooth gear 12e etc., if the external tooth gear 12e of each preform bearing 12 of sending along this carrying channel 11 is meshed with this synchronous belt, while then tubular body 12a rotates by conveyance.So, while the preform 5 that is supported by this preform bearing 12 rotates by conveyance.

Then, in extending forming section 6, carry out the PET bottle 7 that biaxial stretch blow molding obtained and have oral area 7a, expand neck 7b, the tubular tube 7c of portion and the bottom 7d that are split into circular cone shape.Oral area 7a is that the oral area 5a of preform 5 does not extend and still with the residual part of original size, and part in addition is that twin shaft extends the part that is shaped.

(preform supply unit)

Now referring again to Fig. 1～3 describes.Preform supply unit 3 has the supply sliding surface 21 that relies on the deadweight landing under the state that the oral area 5a with preform 5 is suspending in midair.Send by the screw axis 22 that outer peripheral face is formed with the screw mandrel groove 22a that the spacing conversion uses on one side supplying with the preform after the landing 5 on the sliding surface 21, on one side these are made the 1st spacing p1 at interval.

The oral area 5a of 2 preforms 5 of the front of being sent by the 1st spacing p1 is controlled from both sides by swinging chuck mechanism 23, is inverted as shown in Figure 2, under the state that stands upside down, is inserted on the lock pin 12c of 2 preform bearings 12 of standby.Its result, each preform 5 becomes with the handstand posture and is supported in state on the preform bearing 12.

2 preform bearings 12 of standby rest to the slide block 24a of the slide mechanism 24 of the direction horizontal slip of reclaiming road 13 and carrying channel 11 quadratures on.The slide block 24a of slide mechanism 24 accepts preform bearing 12 on each 2 ground, position corresponding with reclaiming road 13.After preform 5 is bearing on these 2 preform bearings 12, slide into the position corresponding with carrying channel 11.Slide mechanism 24 is by elevating mechanism 25 supportings.When slide block 24a moves to the position corresponding with carrying channel 11, this slide mechanism 24 is risen, make preform bearing 12 be in the height and position that can give carrying channel 11.

Near slide mechanism 24, dispose ejecting mechanism 26.When preform bearing 12 arrives can give the height and position of carrying channel 11 time, preform bearing 12 is forwards released the 1st pitch of feed by ejecting mechanism 26 2 times.Its result, 2 preform bearings 12 become the state of being given carrying channel 11 from slide mechanism 24.

In preform supply unit 3,, preform bearing 12 each 2 ground that are supported with preform 5 are passed out to carrying channel 11 by repeating this action.

(pitch enlargement mechanism)

Supported the preform bearing 12 of preform 5 and in carrying channel 11, sent successively, become the state of temperature that is suitable for being shaped via heating part 4 (1)～4 (3) with the state (the 1st pitch of feed) that contacts with each other.Arrive the position, front 31,32 (with reference to Fig. 1,2) of extending forming section 6 via the preform bearing behind the heating part 4 (3) of terminal stage 12.The side of

position

31,32 disposes pitch enlargement mechanism 14 in front of these.

Fig. 5 (a)～(c) is the concise and to the point vertical view of expression pitch enlargement mechanism 14, concise and to the point side view and brief configuration figure.Pitch enlargement mechanism 14 has front side holding plate 41 and rear side holding plate 42.Front side holding plate 41 is along carrying channel 11 horizontally extending elongated rectangles, in the side of its carrying channel 11 sides, begins to be formed with the semicircular the 1st from the front side of the direction of feed of carrying channel 11 and keeps groove the 51, the 2nd to keep groove 52 and the 3rd to keep groove 53.Rear side holding plate 42, is formed with one the semicircular the 4th in the side of its carrying channel 11 sides and keeps groove 54 in abutting connection with the rear side that is configured in the conveyance direction with respect to front side holding plate 41.

These 4 keep the groove 51～54 can be from the lower portion of the lock pin 12c of horizontal maintenance preform bearing 12.That is, preform bearing 12 is remained between the side and these maintenance grooves of the pair of guide rails that is limited by carrying road 11, under hold mode, the position of the carrying direction of preform bearing 12 is restricted.

The 1st keeps groove 51 and the 2nd to keep the interval of groove 52 to make the 2nd pitch of feed p2, and it is more roomy than the 1st pitch of feed p1, identical with the interval of the shaping

position

33,34 of finishing die 61 in the extension forming section 6.The 3rd of front side holding plate 41 keeps groove 53 and the 4th of rear side holding plate 42 to keep the interval of groove 54 to be configured to become the 1st pitch of feed p1 under the state that these holding

plates

41,42 are being in contact with one another.

These front side holding plates 41 and rear side holding plate 42 are supported to the state that can move back and forth separately along carrying channel 11 by slidingtype supporting device 43.Slidingtype supporting device 43 has: the preceding side slide 44 that front side holding plate 41 is installed; The back side slide 45 of rear side holding plate 42 is installed; With the guide plate 46 that these slide blocks 44,45 is supported with the state that slides freely.

End at the upstream side of the carrying channel 11 of guide plate 46 disposes the 1st block 47, and the end in its downstream disposes the 2nd block 48.Position between them disposes the 3rd block 49 in addition.The 1st block 47 is to be used for to the initial position 41A of front side holding plate 41 shown in the solid line and rear side holding plate 42 in the drawings, the member that 42A limits.The 2nd block 48 is to be used for the member that launching position 41B to the front side holding plate 41 shown in the thick imaginary line in Fig. 5 (a) limits.The 3rd block 49 is to be used for the member that launching position 42B to the rear side holding plate 42 shown in the imaginary line in Fig. 5 (a) limits.

Here, the opposite face at preceding side slide 44 and back side slide 45 is formed with

abutting part

44a, 45a respectively.Under the state behind their butts, the 3rd keeps groove 53 and the 4th to keep groove 54 to be retained the interval of the 1st pitch of feed p1.In addition, connecting rod 45b is outstanding to the conveyance direction from the abutting part 45a of back side slide 45.Connecting rod 45b connects the abutting part 44a of preceding side slide 44 and extension forwards with the state that slides freely, and its front end is formed with large diameter block 45c.

Therefore, back side slide 45 is when the conveyance direction is sent ormal weight to current side slide 44 relatively, and this block 45c meets the front surface 44c of the abutting part 44a of preceding side slide 44.Then, both sides'

slide block

44,45 just becomes one and is sent.In this example, when block 45c met the front surface 44c of abutting part 44a, the 3rd keeps groove 53 and the 4th to keep the interval of groove 54 to be configured to expand reached the 2nd pitch of feed p2.

Then, on the guide plate 46 of slidingtype supporting device 43, be equipped with feed mechanism 71.Feed mechanism 71 has the cylinder 71a that arranges along the conveyance direction, and its expansion link 71b is connected with preceding side slide 44.When expansion link 71b when the conveyance direction is outstanding, preceding side slide 44 is sent, the front side holding plate 41 that carries thereon is sent.

The slidingtype supporting device 43 that is equipped with feed mechanism 71 is by driving and reversing mechanism 72 supportings.Driving and reversing mechanism 72 is the linear guide 72a that are used for along in the configuration of the front and back of conveyance direction, the integral body that makes slidingtype supporting device 43 to carrying channel 11 near and the directions left move back and forth the member of usefulness.This driving and reversing mechanism 72 has: be installed in the support plate 72b on the pallet 2; Be installed in the cylinder 72c on this support plate 72b, slidingtype supporting device 43 passes through this cylinder 72c and relative carrying channel 11 advance and retreat.In this example, utilize driving and reversing mechanism 72, front side holding plate 41 and rear side holding plate 42 are moved back and forth between yielding position 41D, the 42D shown in holding position 41C, the 42C shown in the solid line and the thin imaginary line in Fig. 5 (a).

The action of the pitch enlargement mechanism 14 of this structure now is described.At first, in advance front side holding plate 41 and rear side holding plate 42 are positioned at separately

initial position

41A, 42A and

yielding position

41D, 42D.

When utilizing driving and reversing mechanism 72 to make front side and rear

side holding plate

41,42 advance to their

holding position

41C, 42C, become respectively by the 3rd maintenance groove 53 of front side holding plate 41 and the 4th state that keeps groove 54 to be kept of rear side holding plate 42 by 2 preform bearings 12 of conveyance to the position,

front

32,31 of extending forming section 6 with the 1st pitch of feed p1.Simultaneously, the preform bearing 12 that is arranged in the

shaping position

36,35 of each finishing die 61,62 becomes by the 1st and the 2nd of front side holding plate 41 and keeps

groove

51,52 states that kept.

Under this state, front side holding plate 41 is sent the 2nd pitch of feed p2 by feed mechanism 71 at least 2 times.When front side holding plate 41 was sent the 2nd pitch of feed p2, this rear side holding plate 42 just became the state that is connected with front side holding plate 41 by the connecting rod 45b of rear side holding plate 42.After this, front side holding plate 41 and rear side holding plate 42 become one and are sent.

Front side holding plate 41 is sent the position of colliding with the 2nd block 48, is positioned in launching position 41B by the 2nd block 48.Simultaneously, rear side holding plate 42 is run into the 3rd block 49, is positioned in launching position 42B by the 3rd block 49.

Fig. 6 represents this state.In launching position, the 1st and the 2nd keeps

groove

51,52 to be positioned in drip

molding drain position

36,35, the 3 respectively keeps groove 53 and the 4th to keep groove 54 to be positioned in the

shaping position

34,33 of finishing die 61 respectively.Under this state, extending the matched moulds that forming section 6 forms mould 61, then, the preform 5 that is bearing on each preform bearing 12 is implemented biaxial stretch blow molding.During the action that is shaped, be PET bottle 7 from the preform bearing 12 that is positioned at drip

molding drain position

36,35 drip molding of choosing, reclaim by recoverer 15.

After the shaping, after finishing die sinking, make front side holding plate 41 and rear side holding plate 42 make a

concession position

41D, 42D, then, utilize feed mechanism 71 to make front side holding plate 41 and rear side holding plate 42 turn back to

initial position

41A, 42A by driving and reversing mechanism 72.Before this return action finishes, each preform bearing 12 of the supporting preform 5 on carrying channel 11 is carried out the feed motion of an amount of separation (the 1st pitch of feed p1).This feed motion, the ejecting mechanism 26 by preform supply unit 3 carries out.

In the pitch enlargement mechanism 14 of this structure,, carry out following action simultaneously: the pitch enlargement action of preform 5 by the link gear that constitutes by feed mechanism 71, abutting

part

44,45a and connecting rod 45b; Each preform 5 conveyance is arrived the action of shaping

position

33,34 with the pitch of feed p2 after enlarging; From shaping

position

33,34 with the action of each drip molding 7 conveyance to drip molding drain position 35,36.Therefore, can carry out spacing conversion action rapidly, help improving the processing speed of biaxial stretch blow molding machine 1.

In addition, utilize front side holding plate 41 and rear side holding plate the 42, the 1st to the 3rd block 47～49, by initial position that is positioned at them reliably and supplying position.So, but precision well and is reliably carried out spacing conversion action.

(extension forming section)

It (b) is concise and to the point vertical view and the concise and to the point side view that clamping 63 in the forming section 6 is extended in expression that Fig. 7 (a) reaches.Fig. 8 sees the concise and to the point end view drawing that clamping 63 obtains from preform conveyance direction.As previous narration, the extension forming section 6 of this example has 2 finishing dies of taking 61 arranging along the conveyance direction.Finishing die 61 comprises: a pair of die opening and closing 81,82 that opens and closes in the direction with conveyance direction quadrature; Bed die 83.Die opening and closing 81,82 opens and closes by clamping 63.

Clamping 63 has: the 1st and the 2nd elbow-

bar mechanism

83,84; Make the tie point of these the 1st and the 2nd elbow-

bar mechanism

83,84 move up and down the swing mechanism 85 of usefulness.1st, the 2nd elbow-

bar mechanism

83,84 so the 1st elbow-bar mechanism 83 is described, is put on same-sign for the corresponding position in the 2nd elbow-bar mechanism 84 owing to be symmetrical structure, omits its explanation.

The effect of the 1st elbow-bar mechanism 83 is that a side die opening and closing 81 is moved to its open position and closing position along the linear guide of being supported by pallet framework 2 85.The 1st elbow-bar mechanism 83 has pair of right and left

upside connecting rod

91,92 and pair of right and left downside connecting rod 93,94.Pair of right and left

upside connecting rod

91,92, with the intermediate connecting shaft 95 that extends to the conveyance direction be the center up and down the state that rotates freely of direction be connected to each other.In addition, connecting rod 91 front ends of front side are that the state that the center rotates up and down freely is connected with die opening and closing 81 with front side connecting axle 96.Connecting rod 92 rear ends of rear side are that the state that the center rotates up and down freely is connected with pallet framework 2 sides with rear side connecting axle 97.

Pair of right and left

downside connecting rod

93,94 is also identical, respectively with intermediate connecting shaft 98 be the center up and down direction rotation state freely interconnect.Connecting rod 93 front ends of front side are that the state that the center rotates freely up and down is connected with die opening and closing 81 with front side connecting axle 99.Connecting rod 94 rear ends of rear side are that the state that the center rotates freely up and down is connected with pallet framework 2 sides with rear side connecting axle 100.

Intermediate connecting

shaft

95,98 is up and down supported by vertical links 101 with rotation state freely at the middle position of their length direction.Shown in Fig. 7 left side, when vertical links 101 drops to down position 101A, the linear state that 2 connecting

rods

91,92 of pair of right and left upside and 2 connecting

rods

93,94 of pair of right and left downside become behind horizontal-extending, die opening and closing 81 moves to closing position 81A from open position 81B.

When vertical links 101 when down position 101A rises to lifting position 101B, shown in Fig. 7 right side, 2 connecting

rods

91,92 of pair of right and left upside and 2 connecting

rods

93,94 of pair of right and left downside bend to the mountain font.Its result, die opening and closing 81 retreats into open position 81B from closing position 81A.

It (b) is the concise and to the point vertical view figure and the concise and to the point side view of expression swing mechanism 85 that Fig. 9 (a) reaches, and Figure 10 is from seeing the brief configuration figure that swing mechanism 85 obtains with the direction of carrying channel 11 quadratures.Describe referring now to Fig. 2 and these figure.Swing mechanism 85 has: be installed in the pair of right and left vertical support panel 111 on the pallet framework 2; With the central shaft 112 that is erected on these vertical support panel 111 is the pair of right and left oscillating deck 113 that swing up and down at the center.A pair of oscillating deck 113 extends to the direction of carrying channel 11, utilizes the space configuration of carrying channel 11 downsides.

Set up front side connection box 114 between the end of side in front of the conveyance direction of a pair of oscillating deck 113, portion is connected with the front end of the expansion link 115a of the cylinder 115 of state arranged perpendicular upwards in the central.The end of the opposition side of a pair of oscillating deck 113 is connected with vertical links 101 bottoms of the 1st, the 2nd elbow-

bar mechanism

83,84 by connecting rod 116 respectively.

The action of the clamping 63 of this structure now is described.At first, be positioned under the die opening state of open position 81B, 82B in die opening and closing 81,82, shown in imaginary line among Figure 10, the cylinder 115 of swing mechanism 85 is in the retraction state, about the front end of oscillating deck 113 become the state of swing upward.When cylinder 115 is stretched out upward, about just swing of oscillating deck 113, their front end moves downwards.Oscillating deck 113 is connected with the 1st and the 2nd elbow-

bar mechanism

83,84 by connecting rod 116.When connecting rod 116 was pulled to the below, the vertical links 101 that herein connects just descended, and die opening and closing 81,82 closures form the matched moulds state.

In the clamping 63 of this structure, the 1st and the 2nd elbow-

bar mechanism

83,84 synchronously moves mutually up and down, and die opening and closing 81,82 also synchronously opens and closes.Therefore, when mould opened and closed, inclined to one side load can not take place in the each several part of clamping 63, can avoid each several part to wear and tear, each several part is applied the drawback of impulsive force etc.Can realize mould on-off action smoothly and fast, the result can improve the responsiveness of biaxial stretch blow molding machine 1.

(drip molding discharge portion)

Drip molding discharge portion 8 has at carrying channel 11 and reclaims the slide mechanism 120 of doing horizontal slip between the road 13, is drip

molding drain position

35,36 on the slide block 121 of this slide mechanism 120.In addition, have swinging chuck mechanism 122,122 pairs of this swinging chuck mechanisms are controlled by the oral area that pitch enlargement mechanism 14 passes out to the PET bottle 7 of drip

molding drain position

35,36, and unload from preform bearing 12 and be recovered to recoverer 15.After PET bottle 7 was removed, slide block 121 slided into the position corresponding with reclaiming road 13 from carrying channel 11.Slide mechanism 120 is by elevating mechanism 123 supporting, after slide block 121 slides into the position corresponding with reclaiming road 13, makes this slide block 121 drop to the height and position corresponding with recovery road 13.

Rest 2 preform bearings 12 on the slide block 121 after the decline, release and give by the ejecting mechanism 124 that is configured in its side and reclaim road 13.Reclaiming on the road 13, preform bearing 12 is arranged with the state assortment that is in contact with one another.When 2 preform bearings 12 being released when reclaiming side, be arranged in slide mechanism 24 sides that 2 preform bearings 12 of an end that reclaims road 13 preform supply units, 3 sides are given this preform supply unit 3 by ejecting mechanism 124.Then, slide block 121 turns back to carrying channel 11 sides again and rises, and turns back to the position that can accept preform bearing 12 that PET bottle 7 is supported.In drip molding discharge portion 8, the recovery that repeats PET bottle 7 is as described above moved, preform bearing 12 is given the action of reclaiming road 13 and sending back to from carrying channel.

Claims

1. biaxial stretch blow molding machine, along carrying channel the preform bearing that supports preform is carried out conveyance by heating part and extension forming section, each preform that is sent on 2 shaping positions that extend forming section is carried out biaxial stretch blow molding simultaneously, the drip molding of regulation shape thereby each 2 ground are shaped, it is characterized in that

Has pitch enlargement mechanism, this pitch enlargement mechanism is used for and will arrives the preform bearing of the position, front of described extension forming section with the 1st pitch of feed conveyance along described carrying channel, be sent to each shaping position with the 2nd pitch of feed more roomy than the 1st pitch of feed, and still pass out to the drip molding drain position from each shaping position with the 2nd pitch of feed

This pitch enlargement mechanism has:

Front side retaining member, this front side retaining member have with the 2nd pitch of feed identical distance configuration, the 1st, the 2nd and the 3rd maintaining part that can keep the preform bearing from direction with described carrying channel quadrature;

The rear side retaining member, this rear side retaining member has relative front side retaining member and is configured in the rear side of preform conveyance direction, the 4th maintaining part that can keep the preform bearing from the direction with described carrying channel quadrature;

Link gear, this link gear makes these front side retaining members and the interlock of rear side retaining member, thereby after the front side retaining member is sent with the 2nd pitch of feed from described initial position, the rear side retaining member is sent with this front side retaining member from its initial position, after the front side retaining member returns ormal weight from described launching position, the rear side retaining member returns with this front side retaining member from its launching position

2. biaxial stretch blow molding machine as claimed in claim 1 is characterized in that having:

The 1st block that the initial position of front side retaining member and rear side retaining member is limited;

The 2nd block that the launching position of front side retaining member is limited;

The 3rd block that the launching position of rear side retaining member is limited.

3. biaxial stretch blow molding machine as claimed in claim 1 or 2 is characterized in that, described extension forming section have to a pair of die opening and closing that laterally opens and closes of described preform conveyance direction quadrature,

This is had the clamping that die opening and closing opens and closes usefulness:

This swing mechanism has: