JP2013079116A - Container conveying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container conveying device capable of changing the conveyance interval of containers 6 during conveyance such that the device can be used for both small-size container 6A and large-size container 6B, in the container conveying device which sequentially delivers and receives the container 6 between a plurality of rotation means to convey the container 6 while holding the neck part of the container 6.SOLUTION: A shrinking conveyance means (first conversion wheel 30) which changes the conveyance interval of the container 6 from 48π pitch to 30π pitch and an expanding conveyance means (second conversion wheel 32) which expands the conveyance interval of the container 6 from 48π pitch to 60π pitch are arranged in parallel with each other between a carrying-in conveyance wheel 22 in which grippers 26 are arranged at 48π pitch and a carrying-out conveyance wheel 58 in which grippers 60 are arranged at 30π pitch, and the containers 6 which are conveyed by the carrying-in conveyance wheel 22 are sorted to either the shrinking conveyance means 30 or the expanding conveyance means 32 by a change-over cam 38, and are thus delivered and received.

Description

  The present invention relates to a container transport device that delivers and transports between rotating wheels in a state where the neck portion of the container is held and suspended, and particularly relates to a container transport device that can be used for both large and small containers.

  For example, in order to use both a large container and a small container in the same filling machine, a filling nozzle is arranged in accordance with the small container, and in the case of a large container, the container is supplied at a pitch twice that of the small container. 2. Description of the Related Art A filling apparatus in which every other large container is positioned with respect to a filling nozzle for filling is known (see Patent Document 1).

  Further, as a filling line for continuously filling PET bottles, a line configured from blow molding to filling is already known (see Patent Document 2). In the invention described in Patent Document 2, the filling machine includes a gripper that holds the neck portion of a blow-molded PET bottle, and performs filling while transporting the container while the container is suspended by each gripper. From a blow molding machine for molding PET bottles to a filling machine, delivery is performed by neck handling with a plurality of wheels equipped with grippers.

  In the filling line as described above, the gripper foil is used to supply the large container to the filling machine at a pitch twice that of the small container so that the small container and the large container can be used together as in the invention of Patent Document 1. In this case, it is necessary to change the transport pitch of the PET bottle. Usually, the gap between the grippers is different between the blow molding machine and the filling machine. In such a case, it is known to change the conveying pitch via the gap changing wheel (see Patent Document 3).

Japanese Patent Publication No. 3-14720 JP 2010-241577 A JP 2008-1000084 A

  Even when the interval changing wheel is used as in Patent Document 3, the interval changing wheel cannot be changed as necessary when the small vessel and the large vessel are used together, and the interval changing wheel is replaced. There was a problem of need.

  The present invention has been made in order to solve the above-described problem, and is a container transport device that transports a container having a body part that contains a content liquid and a neck part narrower than the body part in a suspended state that grips the neck part. Container transport that includes a plurality of rotary transporting means in which grippers for gripping the neck portion are arranged at equal intervals in the circumferential direction, delivers and transports containers between different rotary transporting means, and changes the transport interval of the containers during transport In the apparatus, the plurality of rotation conveyance means are provided between a carry-in conveyance means for carrying a container from the upstream side, a carry-out conveyance means for carrying out the container to the downstream side, and between these carry-in conveyance means and the carry-out conveyance means. An interval changing conveying means for changing the container conveying interval, and the gripper arrangement interval of the carry-in conveying means is equal to or greater than the arrangement interval of the grippers of the carry-out conveying means and the gripper of the carry-out conveying means. The interval changing means is not more than twice the placement interval, and the interval changing means includes a double interval means for delivering the container to the carry-out conveyance means at an interval twice the arrangement interval of the grippers of the carry-out conveyance means, and a gripper of the carry-out conveyance means And equidistant means for delivering the container to the carry-out conveying means at intervals equal to the arrangement interval, and switching means for switching use of the double spacing means and the equidistant means is provided.

  Further, the second invention is the first invention according to the first invention, wherein it is arranged upstream of the carry-in conveying means, and the carry-in conveying means has an interval larger than an interval twice the arrangement interval of the grippers of the carry-out conveying means. It is characterized in that it is provided with a carry-in side reduction conveyance means for reducing the container conveyance interval up to the arrangement interval.

  Further, a third invention is the first invention or the second invention, wherein the double spacing means and the equal spacing means are constituted by different rotary conveying means, and the switching means is provided in the carry-in conveying means, The delivery of the container to these different rotary conveying means is switched.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the double-interval means and the equal-interval means are composed of a cam provided in a single rotary conveyance means, and the switching means is the rotation It is provided in the conveying means, and the use of these cams is switched.

  The container transport device of the present invention is provided with an interval changing transport means between the carry-in transport means and the carry-out transport means in which the grippers are arranged at equal intervals in the circumferential direction. The gripper arrangement interval is equal to or greater than twice the gripper arrangement interval of the unloading and conveying means, and the interval changing means is an unloading and conveying means at an interval twice the gripper arrangement interval of the unloading and conveying means. And a double spacing means for delivering the container to the unloading and conveying means, and an equal spacing means for delivering the container to the unloading and conveying means at an interval equal to the arrangement interval of the grippers of the unloading and conveying means. Since the use of the spacing means is switched, there is an advantage that the container transport device can be used as a large container and a small container without exchanging the wheel or the like.

FIG. 1 is a plan view showing the overall arrangement of the container transfer device. Example 1 FIG. 2 is a plan view showing a configuration of a portion for transferring between the carry-in transport means and the interval change transport means. FIG. 3 is a plan view showing the configuration of each rotary conveying means. FIG. 4 is a plan view showing the configuration of the container supply unit to the filling machine. FIG. 5 is a plan view showing a configuration of a portion for transferring from the conversion wheel to the carry-out conveyance wheel. FIG. 5 (a) shows the time when the conveyance pitch is enlarged, and FIG. 5 (b) shows the time when the conveyance pitch is reduced. Example 2)

  A container transport device that transports from a blow molding machine to a filling machine in a state where the neck of a container such as a PET bottle that is molded by a blow molding machine and filled with liquid by a filling machine is held and suspended. A gripper for gripping the neck is arranged at equal intervals in the circumferential direction, and a carry-in conveying means for carrying containers from the upstream side, and a carry-out conveying means for arranging the grippers at equal intervals in the circumferential direction and carrying out the containers downstream And an interval change conveying means for changing the conveyance interval of the container, which is arranged between the carry-in conveyance means and the carry-out conveyance means, and the arrangement interval of the grippers of the carry-in conveyance means is equal to the arrangement of the grippers of the carry-out conveyance means. It is configured to be larger than the interval and smaller than twice the conveyance interval, and further, the interval change conveyance unit is provided with a conveyance interval (for example, 48π pipe) of the container received from the carry-in conveyance unit. ) Is enlarged to twice (60π pitch) the gripper arrangement interval (for example, 30π pitch) of the carry-out conveyance means, and reduced conveyance is reduced to an interval (30π pitch) equal to the gripper arrangement interval of the carry-out conveyance means. Rotating in a configuration in which two transport means are provided, and the container transported by the carry-in transport means is delivered to either the expansion transport means or the reduction transport means by a switching means such as a switching cam. The object of enabling the use of a container of a different size by changing the transport interval of the container while transporting by the transport means is achieved. The gripper arrangement interval (pitch) can be obtained by dividing the length of the rotating circumference in which the gripper moves by the number of grippers. For example, the diameter of the rotating circumference is 960 mm and the number of grippers is 32. For example, it can be expressed as 960π (circumference) / 32 = 30π (mm pitch).

  Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. This container conveyance device (indicated by reference numeral 1 as a whole) is disposed between the upstream blow molding machine 2 and the downstream filling machine 4 and determines the conveyance pitch of the containers 6 when unloaded from the blow molding machine 2. Converted and supplied to the filling machine 4. In particular, in the apparatus according to this embodiment, the conveyance pitch can be changed to a pitch for the small container 6A and a pitch for the large container 6B in order to serve both as the small container 6A and the large container 6B. In this specification, a small container is denoted by reference numeral 6A, and a large container is denoted by reference numeral 6B (see FIG. 4). The container 6 applied to the container transport device 1 according to this embodiment is a PET bottle having a trunk portion for containing the content liquid and a neck portion that is thinner than the trunk portion, although the detailed shape is not shown. The upper or lower part of the formed flange is gripped or held and transported in a suspended state. Although the diameter of the neck of the container does not change between the small container 6A and the large container 6B, the outer dimensions of the trunk are greatly different.

  A blow molding machine 2 is arranged in the first chamber 8 shown in FIG. 1, and the supplied parison is molded into a PET bottle 6 by blow molding, and then carried into the container transport device 1 through a carry-out wheel 10. . In this embodiment, in the blow molding machine 2, the PET bottle 6 is transported at a 100π pitch, and then the transport interval of the container 6 is changed from 100π pitch to a smaller 48π pitch at the carry-out wheel 10 after that. After carrying out, it is carried into the container transport device 1. The carry-out wheel 10 is configured in the same manner as a first conversion wheel 30 to be described later, and constitutes a carry-in side reduction conveyance unit described in claims.

  In the container transfer device 1 installed in the second chamber 12, the PET bottle 6 carried in at a 48π pitch transfer interval is converted into a 30π pitch transfer interval or converted into a 60π pitch transfer interval, and then filled. Supply to machine 4. The filling machine 4 is disposed in a third chamber 14 connected to the downstream side of the second chamber 12, and from the container transfer device 1 at a 30π pitch in the case of a large container 6B, and a small container 6A. In this case, the PET bottle 6 received by the supply wheel 16 is supplied at a pitch of 60π.

  As shown in FIG. 2, the delivery wheel 18 arranged on the inlet side of the container supply device 1 is provided with a plurality of grippers 20 at equal intervals in the circumferential direction. In the delivery wheel 18, the grippers 20 are arranged at a pitch of 48π, and the PET bottle 6 is held by each gripper 20 and conveyed. A gripper opening / closing cam 24 is disposed at a delivery position A from the delivery wheel 18 to the carry-in / convey wheel 22 as the next carry-in / conveying means. A cam follower 20a attached to the rear end of one arm of the gripper 20 is engaged and moved with the gripper opening / closing cam 24, and the PET bottle 6 is delivered from the gripper 20 of the delivery wheel 18 to the gripper 26 of the carry-in conveyance wheel 22. The gripper 20 is opened when performing the operation.

  The next carry-in conveyance wheel 22 is provided with a plurality of grippers 26 at equal intervals in the circumferential direction on the outer peripheral portion. In this embodiment, the grippers 26 are arranged at a pitch of 48π. A circular gripper opening / closing cam 28 is fixed to the inner peripheral side of the position where the gripper 26 is disposed of the carry-in conveyance wheel 22. A cam follower 26 a is attached to the rear end of one arm of each gripper 26, and is always engaged with the outer peripheral cam surface 28 a of the gripper opening / closing cam 28. This carry-in wheel 22 receives the PET bottle 6 from the delivery wheel 18 on the upstream side, and places the PET bottle on one of the two pitch conversion wheels (the first conversion wheel 30 and the second conversion wheel 32) on the downstream side. The bottle 6 is handed over, and a recess for opening is formed in the gripper opening / closing cam 28 at the delivery position A from the upstream side and the delivery positions B and C at two downstream sides, respectively. . The said 1st conversion wheel 30 and the 2nd conversion wheel 32 comprise the space | interval change conveyance means described in Claim 1.

  The carry-in conveyance wheel 22 is provided with grippers 26 at a pitch of 48π, and is provided on the downstream side of the first conversion wheel 30 provided with grippers 34 at a pitch of 48π, and grippers 36 are also provided at a pitch of 48π. The PET bottle 6 is delivered to one of the grippers 34 and 36 of the second conversion wheel 32. In this embodiment, the carry-in conveyance wheel 22 rotates counterclockwise in the figure (see the arrows in FIGS. 1 to 3), and the carry-in carry wheel 22 that rotates while holding the PET bottle 6 on each gripper 26. When handing over to the gripper 36 of the second conversion wheel 32, the gripper 26 is opened and closed at the delivery position C as it is. Further, when the PET bottle 6 is delivered from the gripper 26 of the carry-in conveyance wheel 22 to the gripper 34 of the first conversion wheel 30, the gripper 26 of the carry-in conveyance wheel 22 holds the PET bottle 6 to the second conversion wheel 32. Must pass through the delivery position C. Therefore, a switching means (switching cam) 38 is installed at the delivery position C of the carry-in conveyance wheel 22 to the second conversion wheel 32. The switching cam 38 is a movable cam that can be moved forward and backward by the air cylinder 40. When the switch cam 38 is moved backward, the tip cam surface is located on the inner side of the cam surface 28a of the circular gripper opening / closing cam 28 and affects the overall direction of the gripper 26. Not to give. When the switching cam 38 moves forward by the operation of the air cylinder 40, the cam follower 26a is pushed outward in the radial direction to pass the delivery position C to the second conversion wheel 32 with the gripper 26 closed. The PET bottle 6 is delivered at the next delivery position to the first conversion wheel 30.

  The first conversion wheel 30 is provided with a plurality of grippers 34 on the outer periphery thereof at equal intervals in the circumferential direction. The grippers 34 of the first conversion wheel 30 are also arranged at a 48π pitch, and the PET bottle 6 is delivered as it is from the grippers 26 of the carry-in transport wheel 22. The gripper 26 of the carry-in conveyance wheel 22 is a gripper that opens and closes and grips the neck portion of the PET bottle 6. However, the gripper 34 of the first conversion wheel 30 does not have an opening / closing mechanism and is attracted by a spring or the like. This is a gripper of a type in which the neck portion of the PET bottle 6 is pushed and held between a pair of grip members.

  The first conversion wheel 30 converts the transport pitch of the PET bottle 6 received at an interval of 48π pitch (see the gripper 34 shown on the left side of FIG. 3) into a 30π pitch (see the gripper 34 shown on the right side of FIG. 3). Change of the transport interval of the PET bottle 6) and hand it over to the next first relay wheel 42 (see FIG. 3). The first conversion wheel 30 has a circular pitch conversion cam 44 fixed to the inner side of the gripper 34 disposed on the outer peripheral side, and a cam follower 34a provided at the rear end of each gripper 34 has this pitch. The gripper 34 swings by moving along the conversion cam 44. A swinging portion 44a is formed at the transfer position D of the pitch conversion cam 44 for transferring the PET bottle 6 from the first conversion wheel 32 to the next first relay wheel 42, and each gripper 34 is connected to this swinging portion. When the position 44a is reached, the portions of the gripper 34 that are sequentially changed in direction and holding the PET bottle 6 approach each other, and the PET bottle 6 that is held at an interval of 30π pitch is moved to the first relay wheel 42. Hand over to gripper 46. The first conversion wheel 30 is configured as a reduction conveyance unit that reduces the conveyance pitch of the container.

  The second conversion wheel 32 is provided with a plurality of grippers 48 at equal intervals in the circumferential direction on the outer peripheral portion thereof. The grippers 48 of the second conversion wheel 32 are also arranged at a 48π pitch, and the PET bottle 6 is delivered as it is from the grippers 26 of the carry-in transport wheel 22. Similarly to the gripper 34 of the first conversion wheel 30, the gripper 48 of the second conversion wheel 32 does not have an opening / closing mechanism and pushes the neck of the PET bottle 6 between a pair of grip members attracted by a spring or the like. This type of gripper is held by

  The second conversion wheel 32 increases the transport pitch of the PET bottle 6 received at an interval of 48π pitch (see the gripper 48 shown on the left side of FIG. 3) to a pitch of 60π ( 3) and is transferred to the next second relay wheel 50. The second conversion wheel 32 has a circular pitch conversion cam 52 fixed to the inner side of the gripper 48 disposed on the outer peripheral portion, and a cam follower 48a provided at the rear end portion of each gripper 48 has this pitch. The gripper 48 swings by moving along the conversion cam 52. A swing part 52a is formed at the transfer position E of the pitch conversion cam 52 to transfer the PET bottle 6 from the second conversion wheel 32 to the next second relay wheel 50, and each gripper 48 is connected to the swing part. At 52a, the portions of the gripper 48 that are sequentially changed in direction and holding the PET bottle 6 are separated from each other, and the PET bottle 6 that is held at an interval of 60π pitch is separated from the gripper 54 of the second relay wheel 50. To hand over. This 2nd conversion wheel 32 is comprised as an expansion conveyance means to expand the conveyance pitch of a container.

  The first relay wheel 42 that delivers the PET bottle 6 from the first conversion wheel 30 includes a plurality of grippers 46 at equal intervals in the circumferential direction on the outer peripheral portion. The grippers 46 of the first relay wheel 42 are arranged at intervals of 30π pitch. The gripper 46 of the first relay wheel 42 is an open / close-type gripper like the gripper 26 of the carry-in / conveying wheel 22, and is a circular gripper opening / closing cam fixed to the inner peripheral side of the gripper 46 disposed on the outer peripheral portion. 56, the cam follower 46a attached to the rear end of the gripper 46 moves along. A recess 56a for opening the gripper is formed at the transfer position D of the gripper opening / closing cam 56 from the first conversion wheel 30 to the first relay wheel 42. The recess 56a is opened when the cam follower 46a passes through the recess. So that the gripper 46 is closed and the PET bottle 6 held by the gripper 34 of the first conversion wheel 30 is gripped, and then the PET bottle 6 is taken out as the first relay wheel 42 rotates. It has become. Further, a recess (not shown) for opening the gripper is formed at the transfer position of the gripper opening / closing cam 56 from the first relay wheel 42 to the next carry-out conveyance wheel 58. The PET bottle 6 held by the gripper 46 is pushed into and held in the gripper 60 of the carry-out conveyance wheel 58, and then opened to deliver the PET bottle 6. Similarly to the gripper 34 of the first conversion wheel 30, the gripper 60 of the carry-out conveyance wheel 58 does not have an opening / closing mechanism and pushes the neck portion of the PET bottle 6 between a pair of grip members attracted by a spring or the like. This type of gripper is held by

  Further, the second relay wheel 50 that delivers the PET bottle 6 from the second conversion wheel 32 includes a plurality of grippers 54 at equal intervals in the circumferential direction on the outer peripheral portion. The grippers 54 of the second relay wheel 50 are arranged at intervals of 60π pitch. The gripper 54 of the second relay wheel 50 is an open / close type gripper like the gripper 46 of the first relay wheel 42, and the gripper 54 is connected to a circular gripper opening / closing cam 62 fixed to the inner peripheral side of each gripper 54. The cam follower 54a attached to the rear end moves along the rear end. A gripper opening recess 62a is formed at the transfer position E of the gripper opening / closing cam 62 from the second conversion wheel 32 to the second relay wheel 50, and is opened when the cam follower 54a passes through the recess 62a. The gripper 54 is closed at the time of passing through the recess 62a, the PET bottle 6 held by the gripper 48 of the second conversion wheel 32 is gripped, and then the PET bottle 6 is taken out with the rotation of the second relay wheel 50. It is like that. Further, a recess 62b for opening the gripper is formed at the transfer position G of the gripper opening / closing cam 62 from the second relay wheel 50 to the next carry-out conveying wheel 58, and the gripper 54 of the second relay wheel 50 is The gripping PET bottle 6 is pushed into and held in the gripper 60 of the carry-out conveyance wheel 58, and then opened to deliver the PET bottle 6.

  The first relay wheel 42 and the second relay wheel 50 rotate counterclockwise in this embodiment (see arrows in FIGS. 1 and 3). Therefore, the carry-out conveyance wheel 58 as a carry-out conveyance means for delivering the PET bottle 6 from both the relay wheels 42 and 50 rotates in the clockwise direction, and any of the first relay wheel 42 and the second relay wheel 50 is rotated. The delivery of the PET bottle 6 is received from either side. When delivering from the first relay wheel 42 to the carry-out conveyance wheel 58, the gripper 60 of the carry-out conveyance wheel 58 does not hold the PET bottle 6 when passing the delivery position G from the second relay wheel 50. However, when transferring from the second relay wheel 50 to the carry-out conveyance wheel 58, the gripper 60 of the carry-out conveyance wheel 58 that receives and holds the PET bottle 6 is connected to the first relay wheel 42. When the delivery position F is reached, the held PET bottle 6 interferes with the gripper 46 of the first relay wheel 42. Therefore, in order to avoid interference, the switching cam 64 is disposed at the delivery position F from the first relay wheel 42 to the carry-out conveyance wheel 58. The switching cam 64 is a movable cam that moves forward and backward by the air cylinder 66. When the switching cam 64 moves forward by the operation of the air cylinder 66, the cam follower 46a attached to the rear end of the gripper 46 is pressed to open the gripper 46. Has come to speed up.

  The carry-out conveyance wheel 58 is provided with a plurality of grippers 60 at equal intervals in the circumferential direction on the outer peripheral portion. These grippers 60 are arranged at intervals of 30π pitch. Accordingly, when the PET bottle 6 is transferred from the gripper 46 of the first relay wheel 42, the grippers 46 and 60 are arranged at an equal interval of 30π in both the wheels 42 and 58. Delivery is performed from each gripper 46 of the wheel 42 to each gripper 60 of the carry-out conveyance wheel 58. On the other hand, since the grippers 54 of the second relay wheel 50 are arranged at a pitch (60π pitch) double that of the grippers 46 of the first relay wheel 42, the PET gripped by the grippers 54 of the second relay wheel 50. Every other bottle 6 is delivered to each gripper 60 of the carry-out conveyance wheel 58 at intervals of twice. The first conversion wheel 30 and the first relay wheel 42 that deliver the PET bottle 6 at equal intervals to the carry-out conveyance wheel 58 constitute the equidistant means of the claims, and the second conversion wheel 32 that delivers at double intervals. The second relay wheel 50 constitutes the double spacing means of the claims. As described above, the interval changing and conveying means includes the double interval means and the equal interval means constituted by the rotary conveyance means, and the use of these double interval means and the equal interval means can be switched.

  The PET bottle 6 held by the gripper 60 provided on the carry-out conveyance wheel 58 at the final position of the container conveyance device 1 is supplied at the entrance to the filler 4 installed in the next third chamber 14. It is transferred to a gripper (not shown) of the wheel 16 (see FIGS. 1 and 4). The grippers of the supply wheel 16 are arranged on the outer peripheral side at equal intervals in the circumferential direction (the same 30π pitch as the gripper 60 of the carry-out conveyance wheel 58), and the PET bottles 6 are placed on all the grippers 60 of the carry-out conveyance wheel 58. When held, the PET bottle 6 is delivered to all the grippers of the supply wheel 16, and when every other gripper 60 is held by the gripper 60 of the carry-out conveyance wheel 58, the supply is performed. Passed to every other gripper on the wheel 16. The supply wheel 16 is configured similarly to the second relay wheel 50 in which the gripper is opened and closed at a predetermined position.

  The PET bottle 6 held by the gripper of the supply wheel 16 is supplied to the filling machine 4. As shown in FIG. 4, the filling machine 4 is provided with a plurality of grippers 68 at equal intervals in the circumferential direction. The grippers 68 of the filling machine 4 are arranged at intervals of 30π pitch. When the small containers (small PET bottles) 6A are gripped by all the grippers of the supply wheel 16, the PET bottles 6A are sequentially delivered to all the grippers 68 of the filling machine 4 (the round container of FIG. 4). 6A). In the case of a large container (large PET bottle) 6B, every other gripper of the supply wheel 16 is gripped, and every other gripper 68 of the filling machine 4 is also large. The PET bottle 6B is delivered (see the rectangular container 6B in FIG. 4).

  The operation of the container transport device 1 according to the above configuration will be described. The PET bottle 6 is molded by the blow molding machine 2 arranged on the upstream side of the container conveying device 1. This blow molding machine 2 conveys the PET bottle 6 at a 100π pitch, and the carry-out wheel 10 that delivers the PET bottle 6 from the blow molding machine 2 changes the conveyance interval of the PET bottle 6 from 100π pitch to 48π pitch. To do.

  The PET bottle 6 is transferred from the carry-out wheel 10 that transfers the PET bottle 6 at a transfer interval of 48π pitch to the transfer wheel 18 at the upstream end of the container transfer device 1. The gripper 20 is disposed on the outer peripheral portion of the delivery wheel 18 at a 48π pitch, and the PET bottle 6 is delivered from the carry-out wheel 10 at a 48π pitch as it is.

  The next carry-in conveyance wheel 22 of the delivery wheel 18 is also provided with grippers 26 at a 48π pitch, and delivery is performed from the delivery wheel 18 to the carry-in / convey wheel 22 at a 48π pitch at the delivery position A.

  In the carry-in transport wheel 22, in order to change the pitch to a different pitch depending on the size of the PET bottle 6 being transported, it is distributed to either the first conversion wheel 30 or the second conversion wheel 32 according to the size of the PET bottle 6. I do. In the case of the small container 6 </ b> A, the small container 6 </ b> A is transferred from the carry-in conveyance wheel 22 to the first conversion wheel 30. The first conversion wheel 30 is also provided with grippers 34 at a 48π pitch, similarly to the carry-in / conveying wheel 22, and the small container 6A is transferred from the carry-in / conveying wheel 22 to the first conversion wheel 30 at the 48π pitch. Is called. The first conversion wheel 30 that has received the small container 6A swings the gripper 34 by the swinging portion 44a of the pitch conversion cam 44, so that the interval between the small containers 6A held by the gripper 34 at the transfer position D is 30π. Switch to pitch. In this embodiment, the carry-in wheel 22 rotates in the counterclockwise direction of FIGS. 1 to 3, and the PET bottle 6 held by the gripper 26 is transferred to the first conversion wheel 30. Since the gripper 26 holding the PET bottle 6 must pass through the second conversion wheel 32 without passing the PET bottle 6 at the transfer position C with the second conversion wheel 32, the air cylinder 40 is operated. Thus, the switching cam 38 is advanced to press the cam follower 26a of the gripper 26, thereby maintaining the closed state of the gripper 26.

  The first relay wheel 42 that delivers the small container 6A from the first conversion wheel 30 is provided with grippers 46 at a 30π pitch, and conveys the small container 6A while receiving it at an interval of 30π pitch. The small container 6A is delivered to the carry-out conveyance wheel 58 in which the gripper 60 is arranged. In the first relay wheel 42 that has received the small container 6A from the first conversion wheel 30, the small containers 6A are held by all the grippers 46, and the carry-out and transfer wheels 58 are also held by all the grippers 60. .

  From the carry-out conveyance wheel 58 in which the small containers 6 </ b> A are held in all the grippers 60 to all the grippers of the supply wheel 16 in which grippers (not shown) are arranged at a pitch of 30π like the carry-out conveyance wheel 58. 6A is delivered. Further, grippers 68 are also provided at a 30π pitch in the filling machine 4, and the small containers 6A are delivered to all the grippers 68 (see the circular container 6A in FIG. 4).

  When the PET bottle 6 sent to the carry-in transport wheel 22 is a large container 6B, the PET bottle 6 is delivered from the gripper 26 of the carry-in transport wheel 22 to the second conversion wheel 32 that is a route for the large container. In this case, since the transfer from the gripper 26 of the carry-in conveyance wheel 22 to the gripper 34 of the second conversion wheel 30 is performed, the switching cam 38 is not operated, and the large container 6B is transferred to the gripper 48 by opening and closing the gripper 26. Do. Similarly to the carry-in and transfer wheel 22, the second conversion wheel 32 is also provided with grippers 48 at intervals of 48π pitch, and the delivery of the large container 6B from the carry-in and transfer wheel 22 to the second conversion wheel 32 remains at 48π pitch. Done in The second conversion wheel 32 that has received the large container 6B swings the gripper 48 by the swinging portion 52a of the pitch conversion cam 52, thereby reducing the interval between the large containers 6B held by the gripper 48 at the transfer position E by 60π. Switch to pitch.

  The second relay wheel 50 that delivers the large container 6B from the second conversion wheel 32 is provided with grippers 54 at a pitch of 60π, conveys the large container 6B while receiving it at an interval of 60π pitch, and grippers at a pitch of 30π. The large container 6B is delivered to the carry-out conveyance wheel 58 in which 60 is disposed. In the second relay wheel 50 that has received the large container 6B from the second conversion wheel 32, the large container 6B is held by all the grippers 54 arranged at a 60π pitch. Since the grippers 60 are arranged at a pitch of 30π, the large container 6B is delivered to every other gripper 60 of the carry-out conveyance wheel 58.

  When the large container 6B is delivered from the second relay wheel 50 to the gripper 60 of the carry-out conveyance wheel 58, the gripper 60 passes the delivery position F with the first relay wheel 42 while holding the large container 6B. Therefore, interference with the gripper 46 of the second relay wheel 42 must be avoided. Therefore, the switching cam 64 is advanced by the operation of the air cylinder 66 to press the cam follower 46a of each gripper 46, and the gripper 46 is opened earlier than when the small container 6A is delivered, and the delivery position F remains open. Pass through.

  From the carry-out conveyance wheel 58 in which the large container 6B is held by every other gripper 60 to the filling machine 4 in which grippers (not shown) are arranged at a 30π pitch like the gripper 60 of this carry-out conveyance wheel 58. On the supply wheel 16, the large container 6B is delivered to every other gripper. The filling machine 4 is also provided with grippers 68 at a pitch of 30π, and the large container 6B is delivered to every other gripper 68 (see the rectangular container 6B in FIG. 4). In addition, since the blow molding machine is equipped with the metal mold | die for shape | molding a bottle, the conveyance pitch of a container is larger than a filling machine, and is larger than twice in many cases. When transferring containers one by one continuously to the filling machine and every other container, the conveyance pitch of the containers to be carried out at a conveyance pitch exceeding twice that of the filling machine from the blow molding machine is once carried out. Since it has been reduced to a conveyance pitch equal to or larger than the arrangement interval of the grippers of the conveying means and twice or less, after that, it has been changed to an equal interval or twice an interval with the carry-out conveying means. In the case of changing to, the change width does not become too large, and the transfer can be performed stably between the rotary conveying means.

  In the above embodiment, when the conveyance pitch of the container 6 is reduced, the container 6 is transferred to the carry-out conveyance wheel 58 via the first conversion wheel 30 and the first relay wheel 42, and when the conveyance pitch is increased, The container 6 is delivered via the second conversion wheel 32 and the second relay wheel 50. In the second embodiment, as shown in FIGS. 5 (a) and 5 (b), a single conversion is performed. The wheel 130 can change the conveyance pitch of the container. In this embodiment, the common cam 144 arranged on the inner peripheral side of the gripper 134 of the conversion wheel 130 is arranged at the upper and lower positions of the delivery position J from the conversion wheel 130 to the carry-out conveyance wheel 158 as a reduction cam 170 as an equal interval means. And an enlargement cam 172 as double spacing means. These cams 170 and 172 can be moved forward and backward by an air cylinder 174 as switching means (the air cylinder of the enlargement cam 172 is disposed on the back side of the common cam 144). When the cams 170 and 172 move forward, the cam follower 134a of the gripper 134 is engaged and moved to a position where the gripper 134 is swung. When the cams 170 and 172 move backward, the cam 170 and 172 are retracted to a position where they do not interfere with the cam follower 134a.

  In the above configuration, the containers conveyed by the gripper 126 of the carry-in conveyance wheel 122 at intervals of 48π pitch are delivered to the gripper 134 of the conversion wheel 130 at the delivery position H to the conversion wheel 130 with the conveyance pitch of 48π. When enlarging the conveyance pitch of the container, the reduction cam 170 is moved backward, and the enlargement cam 172 is moved forward so that the gap between the grippers 134 is increased at the delivery position J. By enlarging the interval of the containers gripped by the swing of the gripper 134 to 60π and transferring it to every other gripper 160 provided at an interval of 30π pitch on the carry-out transfer wheel 158, the transfer interval of the containers is increased. Enlarge to 60π pitch. On the contrary, when the container transport pitch is reduced, the enlargement cam 172 is moved backward, and the reduction cam 170 is moved forward so that the gap between the grippers 134 approaches at the delivery position J. In a state where the gripper 134 is approached so that the container held by the gripper 134 of the conversion wheel 130 has a pitch of 30π, the container is delivered to the gripper 160 of the carry-out conveyance wheel 158 that is also provided at the pitch of 30π. In this embodiment, the same effects as those of the first embodiment can be obtained. In this embodiment, the container is directly transferred from the conversion wheel 130 to the carry-out conveyance wheel 158, and no relay wheel is required.

1 container transport device 6 container (PET bottle)
6A Small container 6B Large container 22 Loading / conveying means (loading / conveying wheel)
26 Gripper of carry-in conveyance means 30 Interval change conveyance means (first conversion wheel)
32 Interval change conveying means (second conversion wheel)
38 Switching means (switching cam)
58 Unloading and conveying means (unloading and conveying wheel)
60 Gripper of carry-out conveying means

Claims (4)

A container transporting device for transporting a container having a body part containing the content liquid and a neck part narrower than the body part in a suspended state holding the neck part,
In a container transport device that includes a plurality of rotary transporting means in which grippers for gripping the neck portion are arranged at equal intervals in the circumferential direction, delivers and transports containers between different rotary transporting means, and changes the transport interval of the containers during transporting.
The plurality of rotary conveyance means are provided between the carry-in conveyance means for carrying the container from the upstream side, the carry-out conveyance means for carrying out the container to the downstream side, and the conveyance of the container provided between the carry-in conveyance means and the carry-out conveyance means. It consists of an interval change conveying means that changes the interval,
The arrangement interval of the grippers of the carry-in conveying means is not less than the arrangement interval of the grippers of the carry-out conveyance means and not more than twice the arrangement interval of the grippers of the carry-out conveyance means,
The interval changing means includes a double interval means for delivering a container to the carry-out conveying means at an interval twice as large as an arrangement interval of the grippers of the carry-out conveyance means, and an unloading / conveying means at an interval equal to the arrangement interval of the grippers of the carry-out conveyance means. And equidistant means for delivering the container to
A container transfer device characterized in that a switching means for switching use of the double interval means and the equal interval means is provided.   Carrying-in side reduced conveyance which is arranged on the upstream side of the carry-in conveyance means and reduces the conveyance interval of the container from an interval larger than twice the arrangement interval of the grippers of the carry-out conveyance means to an arrangement interval of the carry-in conveyance means. The container transport device according to claim 1, further comprising means.   2. The double-interval means and the equal-interval means are composed of different rotary conveyance means, and the switching means is provided in the carry-in conveyance means to switch delivery of containers to these different rotary conveyance means. Or the container conveying apparatus of Claim 2.   The double-spaced means and the equally-spaced means are constituted by cams provided in a single rotary conveyance means, and the switching means is provided in the rotary conveyance means to switch use of these cams. The container conveyance apparatus of Claim 1 or Claim 2.

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