JPH06102357B2 - Conveyor for preforms - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a preform conveying device for conveying a preform along a conveying path provided with a processing station.

[Prior Art] In order to mold a hollow molded product as a final product, for example, a bottle, a preformed product (also referred to as Parison) is injection-molded in advance, and then an apparatus for blow molding the preformed product is used. is there. In the apparatus disclosed in Japanese Patent Laid-Open No. 50-89470, the first preform is capable of being rotated and conveyed while being heated.
And a second transport path for receiving the preforms from the first transport path and rotationally transporting a plurality of radially arranged blow molding dies. In this device, it is difficult to supply air and electric power to the blow mold that is rotatably conveyed, which increases the structural cost. In this respect, as in the device disclosed in Japanese Patent Laid-Open No. 1-297231, the receiving step of the injection-molded preform, the heating step, the blow molding step, and the ejecting step are fixedly arranged on the endless conveyance path, It is advantageous to supply air, electric power or the like to the fixed process position and intermittently convey the preformed product to each process.

[Problems to be Solved by the Invention] However, in the case of intermittent transfer, the transfer stop time must be unified according to the maximum processing time at a certain processing station. The injection molding time is the maximum processing time in the molding method usually called hot parison, and the heating temperature adjustment time is the maximum processing time in the molding method called cold parison method. It is necessary to stop the transportation at each processing station, and the stop time is wasted. Therefore, as in the device disclosed in JP-A-1-297231, heating / heating
It is possible to perform the temperature control process in multiple stages,
To reheat a cold parison to a temperature at which it can be blow-molded, it usually takes 10 times longer than the blow-molding time.Therefore, a heating temperature control step must be provided over a long section, and the installation area of the device is small. It will increase and the cost will increase. Further, since the stop time is determined by the processing time at one processing station, setting of processing conditions such as heating conditions at other processing stations becomes extremely complicated. Further, the intermittent transport has a more complicated control than the continuous transport, and power consumption also increases.

The object of the present invention is to adopt a novel transport system that has never existed in the past, so that the preform can be stopped at the processing station while continuously rotating the rotary disc, and also on the transport path. An object of the present invention is to provide a preform conveying device capable of accelerating and decelerating the preform.

Another object of the present invention is to provide a simple and highly reliable structure capable of continuously expanding, accelerating, decelerating, and stopping driving of a support arm for carrying a preformed product by a cam and a cam follower by continuously driving the rotary disk. It is to provide a carrier.

Another object of the present invention is to provide a transfer device that improves the coupling structure for holding a preform so that the preform can be chucked and unchucked in a short time, thereby contributing to shortening the molding cycle. It is in.

[Means for Solving the Problem and Its Action] A conveying device for a preformed product according to the present invention, which achieves the above object, is a device for conveying a preformed product along a conveyance path in which a processing station is arranged, A rotary disc, a fixed plate provided to face the rotary disc, first and second cams formed on the fixed plate, and extendable and retractable in the radial direction from the rotary disc. A supporting arm swingably supported by the rotating disk and provided with a first cam follower guided by the first cam and a second cam follower guided by the second cam; and a supporting arm of the supporting arm. A coupling that is disposed on the tip side and that detachably holds the neck portion of the preform; and the support arm is extended and contracted in the longitudinal direction by the driven position of the first cam follower. Characterized in that the acceleration in the conveying path said proximal the driven position of the second cam follower by being swung as a fulcrum, it is possible to decelerate and stop.

According to the present invention, since the base end of the support arm is supported by the rotary disc, the base end is continuously rotated integrally with the rotary disc. However, due to the relationship between the first cam and the first cam follower, and the relationship between the second cam and the second cam follower, the support arm continuously drives the preform held at its tip side at a constant speed. Instead, the support arm can be swung with the base end as a fulcrum, and can be expanded and contracted as necessary to accelerate or decelerate the preform. Furthermore, the preform can be stopped on the transport path by a combination of swinging and expanding and contracting the support arm.

The first cam can extend the support arm by increasing the distance from the base end position of the support arm to the driven position of the first cam follower, and conversely shortens the support arm. Can be shortened.

On the other hand, the second cam can accelerate the support arm by moving the position of the second cam follower away from the center of rotation of the rotary disk in accordance with the rotation of the rotary disk, and bring the support arm closer to the center of rotation. The supporting arm can be decelerated by moving forward.

Such a support arm is oscillated with respect to the rotary disk according to the driven position of the second cam follower, and is supported by the oscillating part so as to be linearly movable, and the rod is supported at the tip thereof. A rod, a linear driving unit that is linearly movable with respect to the swinging unit in the same direction as the rod, and linearly moves according to a driven position of the first cam follower, and based on the movement of the linear driving unit, It can be configured with a guide drive mechanism for linearly driving the rod. On this occasion,
When the linear drive unit and the rod are fixed as the guide drive mechanism, the rod stroke is always equal to the stroke of the linear drive unit, and the position of the first cam is set farther from the rotation locus of the base end of the support arm. If it is not, a predetermined expansion / contraction stroke of the support arm cannot be secured. This is
This means that the outer shape of the fixing plate becomes extremely large.

Therefore, it is preferable that the guide drive mechanism be capable of increasing the movement stroke of the rod with respect to the small stroke movement of the linear drive unit. Examples of such a guide drive mechanism include, for example, a first link whose one end is rotatably connected to the swing portion, one end which is rotatably connected to the rod tip side, and the other end of which is the first link. A second link rotatably connected to the other end of the link, and a third link having one end rotatably connected to the linear drive unit and the other end rotatably connected to the middle of the first link. And can be configured with.

Further, the present invention improves the coupling structure that holds the neck of the preform.

That is, the coupling of the preform includes a plurality of clamps that surround and hold the neck portion of the preform and that are hinge-coupled so that the holding state can be released by rotation, and these clamps are close to each other. A rotation control mechanism for rotating the clamp in a rotating direction and a separating direction, and is configured to surround and hold the neck portion in a proximity rotation state of a plurality of clamps, and to separate from the neck portion in a separation rotation state. There is. Since the rotating operation of the clamp can be performed relatively quickly, the receiving operation and the ejecting operation of the preform can be performed quickly, which can contribute to the shortening of the molding cycle.

Here, by forming the receiving portion that comes into contact with the lower surface of the expansion portion formed in the neck portion, it is possible to reliably prevent the preform from falling.

Each clamp is hinged to a fixed cylinder,
If the rotation control mechanism is composed of a slide ring that moves up and down along the fixed cylinder and a lever whose both ends are rotatably supported by the slide ring and the fixed cylinder, respectively Each clamp can be rotated separately, and each clamp can be rotated in close proximity by lowering the slide ring.

By providing a spring that presses the slide ring so as to always descend, the proximity rotation state of each clamp, that is, the holding state of the preform can be maintained. The separation rotation drive of each clamp can be performed by a slide ring push-up drive member provided in the processing station.

By providing a movable cylinder that can move up and down inside the fixed cylinder, the pressure medium at the time of blow molding can be introduced while maintaining a close contact with the neck portion. A packing that maintains airtightness may be provided at the lower end of the movable cylinder. Further, a flange is formed on each of the upper end of the fixed cylinder and the upper end of the movable cylinder projecting upward by the fixed cylinder, and a spring is arranged between the flanges to push the flange of the movable cylinder to the blow molding station. Providing a member for driving down can surely prevent leakage of the pressure medium.

Such an improvement in the coupling can contribute to shortening the molding cycle even when applied to a device that adopts another transport method, not limited to a transport device that accelerates / decelerates and stops the support arm.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In FIG. 2, a circular fixed plate 10 is firmly connected to a fixed shaft 12. The fixed shaft 12 is fixed to the bottom portion 14 by bolts 16 and 18.

A hollow rotary shaft 20 is rotatably supported around the fixed shaft 12 coaxially with the fixed shaft 12 via bearings 22, 22. The hollow rotary shaft 20 has a rotary disc 40 at its upper end 24, and the rotary disc 40 is firmly connected to the hollow rotary shaft 20 and is rotatable around the fixed shaft 12 together with the hollow rotary shaft 20. A drive pinion 28 is fixed to the lower end 26 of the hollow rotary shaft 20. The drive pinion 28 meshes with a motor pinion 32 fixed to the output shaft of the motor 30.

The fixed plate 10 has a cam plate 50 on the lower surface that faces the rotary disk 40, and the two first and second separate paths in the cam plate 50 are taken.
The cam 52 and the second cam 54 are formed. In this embodiment, each of the first and second cams 52 and 54 is formed as a cam groove. The shape of the cam groove will be described later.

As shown in FIG. 1, a plurality of, for example, 20 support arms 60 (60a to 60t) extending radially from the rotary disk 40 are provided. The base end 62 of each of the support arms 60 is a rotating disc 40.
The base ends 62 are arranged at equal intervals above and swingably supported with respect to the rotating disk 40. Further, the support arm 60 is expandable / contractible in the axial direction by the structure described later. As shown in FIG. 3, the support arm 60 is swingably attached to the rotary disk 40 and is swung by a second cam follower 82 that follows a second cam 54.
And two rods 90, 90 supported by the swinging part 70 so as to be linearly movable, and a first cam follower 106 that follows the first cam 52, and with respect to the swinging part 70. Rod 90
Linear drive unit 100 supported so that it can move linearly in the same direction as
And a coupling 110 fixed to the tips of the rods 90, 90 for holding the preform 1 detachably, and a guide drive mechanism 120 for linearly driving the rods 90, 90 by driving the linear drive unit 100. Composed.

The swinging portion 70 of each of the support arms 60a to 60t has a swinging shaft 72 that is swingably supported by the rotating disk 40 at the base end 62 as shown in FIG. A guide section 74 is fixed to these swing shafts 72. This guide section
74 has a first guide portion 76 composed of two holes 76a, 76a, and movably supports the two rods 90, 90. A second guide portion 78 is formed in the guide section 74, and has support pieces 78a, 78a that are spaced apart and protrude at the upper end of the first guide portion 76, and a guide shaft 78b fixed therebetween. The guide shaft 78b supports the linear drive unit 100 so as to be linearly movable. The support section 92 is attached to the tip of the rod 90, 90 which is guided to move to the guide section 74.
Is fixed. And this support section 92
Is provided with the coupling 110. Using this coupling 110, the preform 1 can be gripped and conveyed on a predetermined conveyance path.

As shown in FIG. 4, a crank-shaped swing arm 80 is fixed to the upper end of the swing shaft 72. This swing arm 80
A second cam follower 82 that follows the second cam 54 is provided at the upper end of the second cam follower 82, and the second cam follower 82 is configured as a roller that rotates with respect to the swing arm 80. In this way, the swing shaft 72 can swing with respect to the rotating disk 40 by the displacement of the swing arm 80.

This swing motion is uniquely determined by the position of the swing shaft 72 that is the base end of the support arm 60 and the driven position of the second cam follower 82, and acceleration / deceleration of the support arm 60 can be realized by this position.

This swinging motion will be described with reference to FIG. In the figure, reference A indicates a base end 62 of the support arm 60, that is, a swing shaft 72.
Indicates the movement locus of, and O indicates the center of rotation of the rotating disk 40,
C indicates the rotation direction of the rotating disk 40. In the case of the present embodiment, the direction of the swing arm 80 and the direction in which the support arm 60 extends are at a right angle, but other angles may be used. As shown in FIG. 7A, if the driven locus B of the second cam follower 82 draws a circle concentric with the movement locus A with respect to the movement locus A, the support arm 60 moves at the same speed as the rotary disc 40. As shown in FIG. 7B, when the driven position of the second cam follower 82 moves away from the rotation center O (the driven locus B moves outward with respect to the movement locus A), the support arm 60 is accelerated. it can. On the other hand, when the driven position of the second cam follower 82 approaches the rotation center O (the driven locus B goes inward with respect to the movement locus A) as shown in FIG. Can be realized.

Then, the preform 1 can be stopped at a certain position by decelerating so that the tip of the support arm 60 stays at the same position, and by expanding and contracting the support arm 60, which will be described later. Then, the curved shape of the second cam 54 is determined to have a shape capable of performing such acceleration / deceleration, and has, for example, a groove shape as shown in FIG.

As shown in FIG. 3, the linear drive unit 100 is formed in an L shape having a long leg 102 extending vertically and a short leg 104 extending horizontally, and a first cam follower 106 is provided at an upper end of the long leg 102. Is provided. The first cam follower 106 is configured as a roller rotatable with respect to the long leg 102, and is driven along the first cam 52. Since the long leg 102 is movably supported by the second guide 78 of the guide section 74, it has a long hole 102a through which the guide shaft 78b is inserted. Furthermore, in order to prevent interference with the rods 90, 90, this rod 9
It has elongated holes 102b and 102c through which 0 and 90 are inserted. A compression coil spring 108 is arranged around the one rod 90 and between the inner end surface 74a of the guide section 74 and the long leg 102 facing the inner end surface 74a, and the linear drive section 100 is fixed to the fixed shaft 12. It is biasing away from you.

The expansion / contraction stroke of the support arm 60 can be obtained by enlarging the movement stroke of the linear drive unit 100 that is displaced together with the second cam follower 106 by the guide drive mechanism 120.

The guide drive mechanism 120 is composed of three links, that is, a first link 122, a second link 124, and a third link 126. The end 122a of the first link 122 has the swing shaft 7
Supported by 2. Therefore, the swing shaft 72 has a rotary head 128 at its lower end, and the rotary head 128 is rotatably supported by the swing shaft 72. In this rotary head 128, the first link 122 is swingably supported by a swing pivot 130.

At the other end 122b of the first link 122, the swing pivot 132
Is provided, and the end portions 122b, 124b of the first and second links 122, 124 are swingably connected to each other through the swing pivot 132. The second link 124 has a swing pivot 134 at the other end 124a, and is swingably supported by the support section 92 by the swing pivot 134.

Further, the third link 126 is swingably supported at its end 126a by the swing pivot 136 on the first link 122, and swings on the short leg 104 of the linear drive unit 100 at the other end 126b. The movable pivot 138 is swingably supported. As a result, the stroke motion of the linear drive unit 100 is transmitted to the support section 92 by the guide drive mechanism 120 according to the lengths of the links 122, 124, 126.

Such a stroke motion includes a base length 62 of the support arm 60,
That is, it is caused by changing the distance from the swing shaft 72 to the first cam follower 106. The position of the preform 1 held at the tip of the support arm 60 is also displaced by the swing motion of the support arm 60 by the action of the second cam 54 and the second cam follower 82. Therefore, even if the support arm 60 is extended to the maximum, it does not necessarily mean that the distance from the center of rotation is the longest. Therefore, the distance from the center of rotation of the preform 1 should determine the extension / contraction length of the support arm 60 in consideration of the progress of the second cam follower 106 that follows the second cam 54. The groove shape of the first cam 52 shown in FIG. 1 is determined in consideration of the shape of the second cam 54 so that a predetermined conveying path for the preform 1 can be realized. Here, the first cam 52 is formed through the vicinity of the peripheral edge of the fixed plate 10, draws a curve that defines one stroke, and is oriented so that it separates from the fixed shaft 12 at each position of the support arm 60. The movement of the ring 110 can be controlled. In this way, by the swinging motion caused by the swing shaft 72 in cooperation with the displacement amount of the preform 1 from the rotation center due to the action of the first cam 52,
The points (plurality of preforms 1) extending radially around the fixed axis 12 can be controlled relative to one another.

Next, an outline of the operation of conveying the preform 1 will be described. The motor 30 is driven in order for the preform 1 to pass through a predetermined transport path through various processing stations. The driving force of the motor 30 is transmitted to the rotary disc 40 via the pinions 32, 28 and the hollow rotary shaft 20. The rotary disc 40 integrally rotates the swing shaft 72, which is the base end of the support arm 60. At this time, the support arm 60 is
The first and second cam followers 106 and 82, which follow the first and second cams 52 and 54, respectively, act to control the position of the coupling 110 at the tip thereof. That is, the support arm 60 swings due to the positional relationship between the second cam follower 82 and the swing shaft 72. Furthermore, the stroke motion of the linear drive unit 100 is performed in relation to the position of the first cam follower 106, and this stroke motion is realized as the stroke motion of the support arm 60 according to the gear ratio of the guide drive mechanism 120. Swing axis
Due to the superposition of the swinging motion performed by the 72 and the stroke motion performed by the linear drive unit 100 and the guide drive mechanism 120, the preform 1 moves on the transport path predetermined by the first and second cams 52, 54. You will be guided through individual processing stations.

Here, an example of the arrangement of the processing stations installed on the transport path will be described.

FIG. 6 shows a receiving station 140 for the preform 1, a first heating station 142, a second heating station 144, a stretch blow molding station 146 and an ejecting station on the conveying path along the rotation direction of the preform 1. 148
Are arranged respectively. In the first and second heating stations 142 and 144, the support arm 60 is decelerated and expanded / contracted in order to align and convey the preform 1 to the linear heating zone. At the stretch blow molding station 146, the preform 1 is stopped for a predetermined processing time. In addition, a receiving station for preform 1
In 140 and eject station 148, deceleration or stop operation is performed so that each operation can be realized. In the other transport zones, the acceleration or deceleration operation is performed so that the operation at each station can be performed quickly and smoothly.

In FIG. 7, first to third stretch blow molding stations 146a to 146c are provided at a plurality of locations, for example, three locations, and heating stations 142a to 142c and receiving stations 140a to 140c are provided on the upstream side of each station 146 for transportation. Eject stations 148a to 148c are provided on the rear side. In this case, in order to secure the support arm pitch,
The diameters of 40 and the fixing plate 10 are increased. In addition, the preform 1 that is conveyed in a row in the circumferential direction is provided at each station 146a.
Control is performed so that the molding operation is performed in any one of to 146c.

Next, a suitable example of the coupling 110 will be described with reference to FIGS.

At the lower end of the coupling 110, two clamps 150 and 152 for holding the preform 1 are provided. The two clamps 150 and 152 are rotatably supported in opposite directions. To this end, the clamps 150, 152 have drag hinges 154, 156, respectively. The drag hinges 154 and 156 are hinged to a fixed ring 162 that is integral with the fixed cylinder 160. Drag hinges 154 and 156 are diametrically opposed to each other on the fixing ring 162.

The rotation control mechanism 170 of the two clamps 150, 152 is formed as a sliding ring 172 which is supported around the fixed cylinder 160 so as to move in its longitudinal direction. A gear 172a is formed on the outer circumference of the sliding ring 172. Further, levers 174 and 176 are rotatably supported at the lower end of the sliding ring 172 so as to be diametrically opposed to each other at upper rotation points 174a and 176a. This lever 174,176
Extends downwards towards the fixed ring 162 and the lower rotation point 174
It is hinged to the clamps 150, 152 rotatably at b, 176b. In this case, the upper rotation points 174a, 176a and the lower rotation points 174b, 176b are such that the virtual connecting line connecting the upper and lower rotation points passes through the drag hinges 154, 156 regardless of whether the clamps 150, 152 are in the close rotation state or the separated rotation states. It is selected not to. In this way, the lever
It is possible to prevent the rotation fulcrums of 174 and 176 from being at the dead center position in both the close rotation state and the separated rotation state of the clamps 150 and 152. As a result, it is prevented that the levers 174, 176 cannot be separated from the dead center position when the clamps 150, 152 should be rotated by the movement of the sliding ring 172.

To ensure that the levers 174,176 move in a direction that precludes their entry into the dead center position, lower pivot points 174b, 176b
Is arranged at a position outside the virtual coupling line extending from the upper rotation points 174a and 176a to the drag hinges 154 and 156 when viewed from the center line P of the fixed cylinder 160 in the separated rotation state of the clamps 150 and 152.

The movement of the sliding ring 172 on the fixed cylinder 160 causes the levers 174 and 176 to rotate about the upper rotation points 174a and 176a and the lower rotation points 174b and 176b. In this case, a force that rotates the coupling pieces 150a, 152a around the drag hinges 154, 156 acts on the coupling pieces 150a, 152a.

A push-up drive member, such as a plate 180, is provided to effect the sliding movement of the sliding ring 172 on the stationary cylinder 160. This plate 180 has a sliding ring 172 facing downwards and 17
The sliding ring 172 is pushed up in a direction in which the sliding ring 172 comes in contact with the 2b and moves away from the fixed ring 162. The downward drive of the sliding ring 172 is realized by the spring 184 supported by the protruding ring 182. The spring 184 is in a tensioned state when the clamps 150 and 152 are rotating away from the preform 1, and is in a relaxed state when the clamps 150 and 152 are holding the neck portion 2 of the preform 1 in the close rotation state.

The protruding ring 182 is provided on the fixed cylinder 160 above the sliding ring 172. The support section 92 is provided above the protrusion ring 182, and the fixed cylinder 160 is rotatably attached to the support section 92. The fixed cylinder 160 is rotatable because the preform 1 is rotated at the heating stations 142 and 144. This rotational driving force is transmitted via the gear 172a formed on the sliding ring 172.

Inside the fixed cylinder 160, a movable cylinder 190 that is vertically movable is arranged. This movable cylinder 190
A packing 192 that is in close contact with the neck portion 2 of the preform 1 is provided at the lower end of the. Further, a flange 194 is formed at the upper end of the movable cylinder 190, and a compression coil spring 196 is formed between the movable cylinder 190 and the upper end flange 160a of the fixed cylinder 160.
Are arranged. The reason why the movable cylinder 190 is movable is that the stretch blow molding station 14
This is because the adhesion between the packing 192 and the upper surface of the neck portion 2 of the preform 1 is improved when the blow molding is performed in 6. That is, in the stretch blow molding station 146, the core member 198 pushes down the flange 194 of the movable cylinder 190, and the elastic force of the spring 196 is used to make the packing 1
The 92 can be brought into close contact with the upper surface of the neck portion 2. As a result, when the pressure medium is introduced into the movable cylinder 190 and the pressure medium is sent to the preform 1, it is possible to prevent the pressure medium from leaking.

In order to ensure that the preform 1 can be connected to the clamps 150, 152, the clamps 150, 152 are adapted to the shape given by the neck 2 of the preform 1. In this way, the clamps 150, 152 can securely surround the neck portion 2 in the close rotation state, and can prevent expansion of the neck portion 2 when introducing the pressure medium. For this reason, the clamps 150, 152 are each formed as a half cylinder, the inner cross section of which corresponds to the outer cross section of the neck 2 of the preform 1.

The preform 1 generally has an expansion 4 in the lower region of the neck 2. The clamps 150 and 152 support the lower surface 4a of the inflatable section 4 to hold the preform 1 without dropping it. For this reason, on the inner walls of the lower ends of the clamps 150 and 152, the receiving surfaces 150b and 152b that support the lower surface 4a of the inflating section 4
have.

In this way, the inner wall shapes of the clamps 150 and 152 and the receiving surface 1
By having 50b and 152b, the preform 1 can be accurately conveyed and held without being displaced during the conveyance. Further, since the rotational movements of the clamps 150 and 152 can be controlled quickly and extremely accurately, the preform 1 can be connected and disconnected quickly. In particular, the proximity rotational movement of the clamps 150 and 152 has already started when the support arm 60 has approached the preform 1, and the preform 1 is clamped by the clamp 15.
It can be controlled to complete the close rotational motion at the moment it is located below 0,152. In addition, since the clamp 150, 152 can be quickly rotated away from each other, the ejecting of the bottle whose blow molding has been completed can be performed quickly, and thereafter, the close rotational movement for holding the new preform 1 is performed by the transfer of the support arm. It can be started during the process.

Next, a mechanism for delivering the preform 1 to the coupling 110 at the receiving station 140 will be described.

The chute 200 shown in FIG. 6 is arranged so as to be inclined as shown in FIG. 11, and the preform 1 is guided and conveyed along the chute 200. At the bottom of this chute 200,
As shown, a transfer member 210 having a U-shaped cutout 212 is swingably arranged about a shaft 214. Then, the transfer member 2 is placed at the position indicated by the solid line (supply position 216).
With 10 arranged, one preform 1 can be received from the chute 200 at the U-shaped notch 212 and rocked to the position indicated by the broken line (the transfer position 218 to the coupling 110). Further, the delivery member 210 can move up and down at the delivery position 218. Further, a guide 219 is provided to prevent the preform 1 from jumping out due to centrifugal force during the transfer between the positions 216 and 218.

As shown in FIG. 13, a pair of arms 220, 220 constituting a push-up drive member are arranged above the delivery position 218 so as to be swingable in the direction shown in the figure and vertically movable. . When the coupling 110, which has completed the eject operation, reaches the delivery position 218, the pair of arms 220, 220 are swung in the directions in which they approach each other, as shown in FIG.
It is set at a position facing the downward surface 172b of the sliding ring 172. Then, by driving the pair of arms 220, 220 upward, the sliding ring 172 can be lifted and the clamps 150, 152 can be rotated separately. After that, the delivery member 210 holding the new preform 1 is driven upward, and the neck portion 2 of the preform 1 is set to a position where it can be held by the clamps 150 and 152. Furthermore, a pair of arms 220, 220
By driving down, the clampers 150, 152 rotate in close proximity, and the preform 1 can be received by the coupling 110.

Next, the eject operation in the eject station 178 will be described.

As shown in FIG. 15, when the coupling 110 holding the blow-molded bottle 6 passes through the eject station 178, it is below the downward surface 172b of the slide ring 172, and is ejected as a push-up drive member. The plate 230 is inserted. After that, as shown in FIG. 16, by raising the eject plate 230 by the cylinder 232,
The slide ring 172 can be lifted to rotate the clamps 150, 152 apart. As a result, the bottle 6 drops downward, so that the eject operation can be completed.

The coupling 110 having the above structure can be applied to a transfer device for accelerating and decelerating the support arm 60, and thus a molding cycle can be significantly shortened. However, a transfer device for a preformed product adopting another transfer method. Even if it is applied to, there is an effect that a preform can be received and an eject can be quickly realized.

[Effects of the Invention] As described above, according to the present invention, the preforms held at the tips of the supporting arms are accelerated and decelerated on the conveying path by the action of the cam and the cam follower while the rotating disk is continuously rotated. And, it can be stopped, the drive control becomes extremely simple compared to the intermittent rotation drive method, the processing time at each processing station can be set independently of the processing time at other processing stations, and the processing conditions can be set. It will be simple.

In addition, the coupling of the preformed product is configured so that the neck part can be held by rotating the clamps closer to each other, and the holding can be released by rotating the clamps apart, so that the preformed product can be received and the final molded product Eject can be performed quickly.

Alternatively, the clamps 150 and 152 of the coupling 110 may be arranged at the upper end, and the preform 1 may be inverted so that the neck 2 at the lower end is held and conveyed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a preform conveying device to which the present invention is applied. FIG. 1 is a cross-sectional view of a main part for accelerating and decelerating and stopping a support arm. FIG. 2 is a schematic diagram of the conveying device. FIG. 3 is a vertical cross-sectional view, FIG. 3 is a cross-sectional view of a support arm, FIG. 4 is a cross-sectional view taken along the line II of FIG. 3, and FIG. 5 is a schematic explanatory view for explaining the acceleration / deceleration operation of the support arm. FIG. 6 is a schematic plan view of the transfer device, FIG. 7 is a plan view in which a part of the transfer device in which three sets of the same processing station are arranged on the transfer path are cut, and FIG. 8 is a front view of the coupling. Fig. 9 is a sectional view of the clamp in a state of close rotation, Fig. 10 is a sectional view of the clamp in a state of separation rotation, Fig. 11 is a schematic explanatory view of a preform receiving station, Fig. 12 Is a plan view of the receiving station, and FIG. 13 is a push-up located at the receiving station. FIG. 14 is a schematic plan view of the moving member, FIG. 14 is a schematic explanatory view showing the relationship between the slide ring and the push-up driving member, and FIG. 15 is a schematic perspective view showing the push-up driving member arranged in the eject station. [Fig. 4] is a schematic front view showing a push-up drive member arranged at an eject station. 1 ... Preformed product, 2 ... Neck part, 4 ... Expansion part 10 ... Fixed plate, 40 ... Rotating disk, 50 ... Cam plate 52 ... First cam, 54 ... Second cam 60 …… Support arm, 62 …… Base end, 70 …… Swing part 82 …… Second cam follower, 90 …… Rod 100 …… Linear drive part 106 …… First cam follower 110 …… Coupling, 120 ...... Guide drive mechanism 122 …… First link, 124 …… Second link 126 …… Third link 140 …… Receiving station 142,144 …… Heating station 146 …… Blow molding station 148 …… Eject station 150,152… … Clamp 154,156 …… Hinge, 160 …… Fixed cylinder 170 …… Rotation control mechanism, 172 …… Sliding ring 174,176 …… Lever 180,220,230 …… Push-up drive member 184 …… Spring, 190 …… Movable cylinder 196 …… Spring

Claims (13)

[Claims] 1. A device for conveying a preformed product along a conveying path in which a processing station is arranged, a rotary disc, a fixed plate provided so as to face the rotary disc, and a fixed plate formed on the fixed plate. First and second cams, and a first cam follower that is extendable and contractible in a radial direction from the rotating disc, and has its base end swingably supported by the rotating disc and guided by the first cam. And a support arm having a second cam follower guided by the second cam, and a coupling arranged on the tip end side of the support arm for detachably holding the neck portion of the preform. The support arm is driven to expand and contract in the longitudinal direction by the driven position of the first cam follower, and is swung about the base end as a fulcrum by the driven position of the second cam follower, so that the support arm is moved. A preform conveying device that can accelerate, decelerate, and stop with. 2. The support cam according to claim 1, wherein the first cam extends the distance from the base end position of the support arm to the driven position of the first cam follower. A conveyance device for a preform, wherein the support arm is shortened by extending and shortening the distance. 3. The scope of claim 1 or 2, wherein the second cam moves the driven position of the second cam follower away from the center of rotation of the rotary disk according to the rotation of the rotary disk. An apparatus for conveying a preformed product, characterized in that the supporting arm is accelerated by moving it forward, and the supporting arm is decelerated by approaching the center of rotation. 4. The swinging part according to claim 1, wherein the support arm swings with respect to the rotating disk according to a driven position of the second cam follower. A rod that is supported by the swinging portion so as to be linearly movable and has the tip thereof supporting the coupling; and a rod that is supported so as to be linearly movable in the same direction as the rod with respect to the swinging portion. A preform conveying device, comprising: a linear drive unit that linearly moves according to a driven position of a cam follower; and a guide drive mechanism that linearly guides and drives the rod based on the movement of the linear drive unit. 5. The guide drive mechanism according to claim 4, wherein one end of the guide drive mechanism is rotatably connected to the swing portion, and one end is rotatably connected to the rod tip side. A second link whose other end is rotatably connected to the other end of the first link, one end rotatably connected to the linear drive unit, and the other end rotating midway through the first link And a third link that is freely connected, wherein the moving stroke of the rod is increased with respect to the small stroke movement of the linear drive unit. 6. An apparatus for carrying a preform by holding it in a coupling along a carrying path in which a processing station is arranged, wherein the coupling surrounds and holds a neck portion of the preform. And a plurality of clamps that are hinged so that the holding state can be released by rotation, and a rotation control mechanism that rotates the clamps in a direction in which they approach each other and in a direction in which they are separated from each other. A conveying device for a preform, characterized in that it surrounds and holds the neck portion in a rotating state, and is separated from the neck portion in a separated rotating state. 7. The preforming according to claim 6, wherein a receiving portion is formed on an inner wall of the clamp, the receiving portion being in contact with a lower surface of an inflating portion formed on the neck portion. Conveyor for goods. 8. The clamp according to claim 6 or 7, wherein each of the clamps is hinged to a fixed cylinder, and the rotation control mechanism has a slide ring that moves up and down along the fixed cylinder and both ends thereof. The slide ring and a fixed cylinder each of which is rotatably supported by a lever,
By raising the slide ring, the clamps are rotated separately from each other via the lever, and by lowering the slide ring, the clamps are rotated in close proximity via the lever. Transport device. 9. The device according to claim 8, further comprising a spring that presses the sliding ring so as to always descend and maintains a close rotation state of the clamps, and the separated rotation drive of the clamps includes: A preform conveying device, characterized in that it is carried out by a slide ring pushing-up drive member provided at the processing station. 10. The movable cylinder according to claim 8 or 9, wherein the movable cylinder is movable inside the fixed cylinder and is capable of introducing a pressure medium during blow molding. A preform transfer device. 11. The flange according to claim 10, wherein an upper end of the fixed cylinder and an upper end of the movable cylinder protruding above the fixed cylinder are respectively formed with a flange, and a spring is arranged between the flanges. A blow molding station, which is one of the processing stations, is provided with a member for pushing down the flange of the movable cylinder to drive it. 12. The fixing cylinder as claimed in claim 9, wherein the fixed cylinder is rotatably supported with respect to a transfer arm that transfers the coupling. The preform-conveying device is rotatably driven by receiving a driving force from a rotation driving unit provided in the heating station. 13. A device for conveying a preform along a conveying path having at least one preform receiving station, one heating station, one blow molding station, and one ejecting station, which comprises a rotating disk. A fixed plate provided to face the rotating disk, first and second cams formed on the fixed plate, and extendable and contractible in the radial direction from the rotating disk, and the base end of the rotating disk is attached to the rotating disk. A supporting arm swingably supported and provided with a first cam follower guided by the first cam and a second cam follower guided by the second cam, and arranged at the tip of the supporting arm. And a coupling that detachably holds the preform, and the support arm extends and contracts in the longitudinal direction depending on the driven position of the first cam follower. The support arm is moved and swung about the base end as a fulcrum by the driven position of the second cam follower, thereby accelerating or decelerating the support arm on the conveyance path between the stations, and the support arm at each station. Decelerating or stopping, the coupling surrounds and holds the neck portion of the preform, and a plurality of hinge-coupled clamps are coupled to each other so that the holding state can be released by rotation. A rotation control mechanism for rotating in a direction approaching and a direction separating from each other, and, in the receiving station and the ejecting station, the clamps can be rotated away from each other to receive or eject a molded product, and in the other transportation processes. A preliminary arrangement characterized in that the clamp is maintained in a close rotation state to surround and hold the neck portion. Transport device in the form goods.