Resin bottle conveying system

Abstract

The present application provides a kind of conveying processing system, can be carried out stable conveying to the resin bottle with neck of different size such as caliber.In the bottle conveying processing system of neck type conveying, intermediate wheel is arranged between filling wheel and capping wheel.When each clamp of intermediate wheel holds small diameter and large diameter bottle, common abutting portion is arranged and abuts with the neck of each bottle, and large diameter bottle abutting portion is arranged and abuts with the neck when holding large diameter bottle.Large diameter bottle abutting portion is separated from the neck when holding small diameter bottle.Common abutting portion abuts with the lower surface of connecting portion and the upper surface of flange when holding small diameter bottle, and is separated from the upper surface of flange and abuts with the lower surface of connecting portion when holding large diameter bottle.Large diameter bottle abutting portion abuts with the upper surface of flange when holding large diameter bottle.

Description

Technical Field

[0001] This invention relates to a conveying system for transporting resin bottles by using a clamp to hold the neck of the bottle around the flange (support ring) at the neck. Background Technology

[0002] A known system transports a resin bottle while alternately gripping the upper and lower surfaces of its flange using clamps (see Patent Document 1). For example, in the system of Patent Document 1, a filler and a capper grip the lower surface of the resin bottle's flange, and the resin bottle is rotated and transported while being filled and capped. An intermediate wheel, which transfers the resin bottle between the filler and the capper, grips the upper surface of the flange and rotates to transport the resin bottle. If the resin bottle's posture becomes disordered while being transported using the intermediate wheel, the filling liquid inside the resin bottle will overflow; therefore, it is necessary to stabilize its posture to an upright position. Therefore, in Patent Document 1, a guide 70 is provided above the clamps 23 and 24. By covering the upper surface of the connecting portion K of the resin bottle with the inclined surface 72 at the front end of the guide 70, the upper surface of the connecting portion K is restricted, thus stabilizing the posture of the resin bottle during transport. In addition, in the system of Patent Document 1, the following structure is proposed: in order to handle resin bottles with different axial lengths of the cylindrical portion between the connecting part and the flange, the height of the clamp of the intermediate wheel can be changed.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 6350075 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, when it is possible to accommodate containers with different neck diameters and connecting parts using the clamp of the intermediate wheel in Patent Document 1, it is sometimes difficult to limit the upper surface of the flashing part K using a guide 70 with a common shape.

[0008] The objective of this invention is to provide a conveying and processing system capable of stably conveying resin bottles with necks of the same diameter but different shapes of connecting parts.

[0009] Methods for solving problems

[0010] The resin bottle conveying system of the first invention is characterized by comprising: an upstream device that rotates and conveys the resin bottle by supporting the lower surface of a flange, the resin bottle having a neck in which a connecting portion, a cylindrical portion, and a flange are sequentially formed below a threaded portion; an intermediate wheel that receives the resin bottle from the upstream device, holds the neck, and rotates and conveys it in a suspended state; and a downstream device that rotates and conveys the resin bottle received from the intermediate wheel by supporting the lower surface of the flange, the intermediate wheel having a plurality of clamps in the circumferential direction for holding the neck of the resin bottle by a pair of swinging clamping members, the clamps of the intermediate wheel having a common abutment portion provided on each of the clamping members, for holding the first resin bottle... When holding a resin bottle and a second resin bottle having a neck with a diameter larger than that of the first resin bottle, the resin bottle abuts against the neck of each resin bottle; and a large-diameter bottle abutting portion, which separates from the neck of the first resin bottle when holding the first resin bottle, and abuts against the neck of the second resin bottle when holding the second resin bottle, the common abutting portion having the following shape: abutting against the lower surface of the connecting portion and the upper surface of the flange in the neck of the first resin bottle when holding the first resin bottle, abutting against the lower surface of the connecting portion in the neck of the second resin bottle when holding the second resin bottle, and separating from the upper surface of the flange, the large-diameter bottle abutting portion having the shape of abutting against at least the upper surface of the flange in the neck of the second resin bottle when holding the second resin bottle.

[0011] The resin bottle conveying and handling system of the second invention is characterized in that, in the first invention, the large-diameter bottle abutment portion has a shape that abuts against the lower surface of the connecting portion in the neck of the second resin bottle and the upper surface of the flange when the second resin bottle is held.

[0012] The resin bottle conveying and handling system of the third invention of the present invention is characterized in that, in the first invention, the large-diameter bottle abutment portion is located on the inner side of the intermediate wheel, which is closer to the middle wheel than the portion of each clamping member where the common abutment portion is located.

[0013] The resin bottle conveying and handling system of the fourth invention of the present invention is characterized in that, in the first invention, the large-diameter bottle abutment portion is disposed on an abutment portion between the pair of clamping members, and is located on the inner side of the intermediate wheel more than the common abutment portion of each clamping member.

[0014] Invention Effects

[0015] According to the present invention, a conveying and processing system is provided that can stably convey resin bottles having necks of the same diameter but different shapes of connecting parts. Attached Figure Description

[0016] Figure 1 This is a top view showing the overall configuration of the resin bottle conveying system according to the first embodiment of the present invention.

[0017] Figure 2 This is a longitudinal sectional view of the left half of the intermediate wheel, showing the state of transferring the bottle between the clamps of the filling wheel or the capping wheel.

[0018] Figure 3 This is an enlarged top view of the clamp showing the state of holding the small-diameter bottle and the large-diameter bottle by the clamp according to the first embodiment.

[0019] Figure 4 This is a schematic partial longitudinal sectional view showing the positional relationship between the clamping member according to the first embodiment and the small-diameter bottle clamped by the clamp.

[0020] Figure 5 This is a schematic partial longitudinal sectional view showing the positional relationship between the clamping member according to the first embodiment and the large-diameter bottle clamped by the clamp.

[0021] Figure 6 This is an enlarged top view of the clamp showing the state of holding the small-diameter bottle and the large-diameter bottle by the clamp according to the second embodiment.

[0022] Figure 7 This is a schematic partial longitudinal sectional view showing the positional relationship between the clamping member according to the second embodiment and the small-diameter bottle clamped by the clamp.

[0023] Figure 8 This is a schematic partial longitudinal sectional view showing the positional relationship between the clamping member according to the second embodiment and the large-diameter bottle clamped by the clamp. Detailed Embodiment

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a top view showing the overall configuration of the resin bottle conveying system according to the first embodiment of the present invention.

[0025] The resin bottle conveying and processing system 10 according to the first embodiment conveys the resin bottle V (resin bottle), which has a neck Vn (refer to Figure 2 , Figure 4 ) in which a connection part (original text: カブラ部) Vb, a cylindrical part Vc, and a flange (support ring) Vf are successively formed below the threaded part Vt. The containers V are supplied in a row from the supply conveyor 12. They are transferred to the filling wheel 16 via the supply wheel 14. In the filling wheel 16, the filling liquid is filled while the bottle V is being rotated and conveyed, and then transferred to the capping wheel 20 via the intermediate wheel 18. In the capping wheel 20, the cap is installed while the bottle V is being rotated and conveyed, and the capped bottle V is discharged from the discharge conveyor 24 via the discharge wheel 22.

[0026] Neck-type conveying is performed using clamps in the filling roller 16, intermediate roller 18, and capping roller 20. For example... Figure 2 As shown, the clamps 17 of the filling wheel 16 and the capping wheel 20 hold the lower side of the flange Vf, and the clamps 30 of the intermediate wheel 18 hold the lower side of the connecting portion Vb on the flange Vf side. Additionally, Figure 2 This is a longitudinal section view of the left half of the intermediate wheel 18, showing the state of the bottle V being transferred between the clamp 17 and the filling wheel 16 or the capping wheel 20.

[0027] The intermediate wheel 18 has a circular plate-shaped rotating wheel 28 supported by the support body 26. The rotating wheel 28 rotates around the support body 26 by a drive source such as a servo motor (not shown). Clamps 30 are provided at regular intervals along the periphery of the rotating wheel 28. The clamps 30 are provided to hold the neck of the bottle V and, as described later, are driven by a cam to open and close.

[0028] The clamp 30 consists of a pair of clamping members 30A, the base of which is mounted on a pair of rotating shafts 32. The rotating shafts 32 are located on the periphery of the rotating wheel 28, and meshing gears 32A are mounted on each rotating shaft 32. Thus, the pair of clamping members 30A can rotate in opposite directions around the axis of each rotating shaft 32 to open and close the clamp 30.

[0029] One end of an arm 34 is fixed to the lower end of one side of the rotating shaft 32. A cam follower 36 is provided at the other end of the arm 34. The cam follower 36 can engage with the first and second cams 38 and 40, which are driven by cylinders 42 and 44 mounted on a support platform (not shown).

[0030] A spring 48 is connected to the lower end of the pin 46 mounted on the rotating wheel 28. The other end of the spring 48 is connected to the other end of a connecting member (arm) 50, one end of which is fixed to one side of the rotating shaft 32. The spring 48 always applies force to the connecting member 50 in the direction that the cam follower 36 approaches the center side of the rotating wheel 28, that is, in the direction that the cam follower 36 presses against the cam surface. The clamping member 30A opens and closes according to the displacement of the cam follower 36. That is, the clamping member 30A opens and closes by engaging the cam follower 36 with either the first or second cam 38, 40.

[0031] Similarly, in the filler (upstream device) and the capper (downstream device), clamps 17 are provided at regular intervals along the periphery of the filling wheel 16 and the capping wheel 20. As is known in the past, the clamps 17 are configured, for example, to hold the container by the elastic force of a cam mechanism, leaf spring, etc.

[0032] The first and second cams 38 and 40 are located below the rotating wheel 28 and near the filling wheel 16 and the capping wheel 20, that is, near the receiving position P1 and the transfer position P2 of the bottle V. The outer peripheral surfaces of the first and second cams 38 and 40 are both shaped to slightly deform the arc centered on the axis of the rotating wheel 28.

[0033] A first fixed cam 52 is provided along the conveying path from near the first and second cams 38 and 40 on the side of the filling wheel 16 (receiving position P1) to near the first and second cams 38 and 40 on the side of the capping wheel 20 (transfer position P2). The first fixed cam 52 is an arc-shaped plate component centered on the axis of the rotating wheel 28. When the cam follower 36 engages with the first fixed cam 52, the cam follower 36 is relatively displaced radially inward, and the clamp 30 remains in the closed state.

[0034] On the other hand, a second fixed cam (not shown) is provided along the conveying path from near the first and second cams 38 and 40 on the side of the capping wheel 20 (transfer position P2 side) to near the first and second cams 38 and 40 on the side of the filling wheel 16 (receiving position P1 side). The second fixed cam is also an arc-shaped plate component centered on the axis of the rotating wheel 28, and its outer diameter is larger than that of the first fixed cam 52. When the cam follower 36 engages with the second fixed cam, the cam follower 36 is relatively displaced radially outward, and the clamp 30 remains in the open state.

[0035] The first and second cams 38 and 40 are selectively advanced and set to engage with the cam follower 36. The first cam 38 is used when conveying a small-diameter bottle (the first bottle) V1 with a relatively small neck, and the second cam 40 is used when conveying a large-diameter bottle (the second bottle) V2 with a relatively large neck. That is, when conveying the small-diameter bottle V1, the first cam 38 is positioned in the forward position and the second cam 40 is positioned in the reverse position; when conveying the large-diameter bottle V2, the first cam 38 is positioned in the reverse position and the second cam 40 is positioned in the forward position.

[0036] When the first cam 38 or the second cam 40 is in the forward position, the outer peripheral surface of the forward cam (38, 40) smoothly connects with the outer peripheral surfaces of the first fixed cam 52 and the second fixed cam. Since the outer diameter of the second fixed cam is larger than the outer diameter of the first fixed cam 52, the outer diameter of the upstream end of the first cam 38 and the second cam 40 on the receiving position P1 side of the forward position has the same outer diameter as the second fixed cam, and is slightly concave towards the downstream side compared to the outer diameter of the first fixed cam 52, and then equals the outer diameter of the first fixed cam 52 at the downstream end. The cam follower 36 moves along this curved surface, thereby closing the clamp 30 at the moment of matching with the small-diameter bottle V1 or the large-diameter bottle V2.

[0037] On the other hand, the outer diameters of the upstream ends of the first cam 38 and the second cam 40, located on the forward position P2 side, are the same as those of the first fixed cam 52. They then smoothly expand slightly more than the outer diameter of the second fixed cam towards the downstream side, and subsequently become equal to the outer diameter of the second fixed cam at the downstream end. The cam follower 36 moves along this curved surface, thereby opening the clamp 30 at the moment of engagement with either the small-diameter bottle V1 or the large-diameter bottle V2.

[0038] Furthermore, since the clamp 17 of the filler and capper engages with the lower surface of the flange Vf of the small-diameter bottle V1 and the large-diameter bottle V2 to hold the bottles V1 and V2, the height of the lower surface of the flange Vf becomes the conveying reference for the filler and capper. On the other hand, the clamp 30 of the intermediate wheel 18 engages with the lower outer periphery of the connecting portion Vb of the bottles V1 and V2 to hold the bottles V1 and V2. The small-diameter bottle V1 and the large-diameter bottle V2 not only have different diameters, but also different lengths of the cylindrical portion Vc between the flange Vf and the connecting portion Vb. Therefore, the relative height of the clamp 17 and the clamp 30 needs to be adjusted depending on whether the bottle being conveyed is a small-diameter bottle V1 or a large-diameter bottle V2.

[0039] Generally, since the cylindrical portion Vc of the large-diameter bottle V2 is longer, when conveying the large-diameter bottle V2, the relative height of the clamp 30 of the intermediate wheel 18 with respect to the clamp 17 needs to be higher than that when conveying the small-diameter bottle V1. In this embodiment, the height of the rotating wheel 28 of the intermediate wheel 18 is adjusted according to the type of bottle being conveyed, thereby accommodating the different lengths of the cylindrical portion Vc. That is, the clamp 30, the rotating shaft 32, the cam follower 36, etc., are raised and lowered integrally with the rotating wheel 28 in accordance with the length of the cylindrical portion Vc, for example, by a lifting mechanism as described in Japanese Patent No. 6350075, thereby adjusting the height of the clamp 30 with respect to the clamp 17.

[0040] Figure 3 This is an enlarged top view of the clamp 30, showing the state in which the clamp 30 of the first embodiment holds the small-diameter bottle V1 and the large-diameter bottle V2. The upper half shows the state in which the small-diameter bottle V1 is held by the neck, and the lower half shows the state in which the large-diameter bottle V2 is held by the neck.

[0041] like Figure 3 As shown, the base ends of the clamping members 30A are respectively mounted on the rotating shaft 32, and the rotating shaft 32 rotates in opposite directions by the same angle through the meshing of a pair of gears 32A. The pair of clamping members 30A are formed symmetrically from left to right, and on the inner side of their front ends, recesses 54 for holding the neck Vn of the bottle V (V1 or V2) are provided facing each other.

[0042] The recess 54 is shaped such that when the small-diameter bottle V1 and the large-diameter bottle V2 are clamped by the clamping member 30A, the center of each neck is located at approximately the same position C within the recess 54. Each recess 54 engages with the small-diameter bottle V1 at two points (common abutment portions) Q1 and Q2 on the front end side, and with the large-diameter bottle V2 at three points: the common abutment portions Q1 and Q2 plus one point (large-diameter bottle abutment portion) Q3 on the base end side. That is, a pair of clamping members 30A holds the small-diameter bottle V1 at four points (4 abutment portions) and holds the large-diameter bottle V2 at six points (6 abutment portions).

[0043] Here, the common abutment part Q1 is located further forward than the center position C, and the common abutment part Q2 is located slightly closer to the base than the center position C. That is, the center position C is located inside the quadrilateral connecting the four common abutment parts Q1-Q2-Q2-Q1. When the clamp 30 is closed, the small-diameter bottle V1 is stably held by only these four points. On the other hand, the large-diameter bottle abutment part Q3 is located at the base of the recess 54. As described above, when the clamp 30 is closed, the large-diameter bottle V2 is stably held by the four points of the common abutment parts Q1 and Q2 plus the six points of the large-diameter bottle abutment part Q3.

[0044] Figure 4 , Figure 5 These are schematic partial longitudinal sectional views showing the positional relationships between the clamping component 30A and the small-diameter bottle V1 clamped in the clamp 30, and between the clamping component 30A and the large-diameter bottle V2 clamped in the clamp 30. Figure 4 , Figure 5 The diagram schematically depicts the side views of the necks Vn of the small-diameter bottle V1 and the large-diameter bottle V2, as well as the cross-sections of the common contact parts Q1 and Q2 and the contact part Q3 of the large-diameter bottle.

[0045] like Figure 4 As shown, the thickness of the clamping member 30A at the common abutment portions Q1 and Q2 is approximately equal to the length of the cylindrical portion Vc in the small-diameter bottle V1. That is, when the small-diameter bottle V1 is clamped by the clamp 30, the clamping member 30A at the common abutment portions Q1 and Q2 fits precisely between the upper surface of the flange Vf and the lower surface of the connecting portion Vb, preventing axial vibration of the small-diameter bottle V1 clamped by the clamp 30. Thus, even when the small-diameter bottle V1 is filled with contents in the filler, it can be transported in a stable state.

[0046] like Figure 5As shown, since the length of the cylindrical portion Vc of the large-diameter bottle V2 is longer than the length of the cylindrical portion Vc of the small-diameter bottle V1, the thickness of the clamping member 30A at the common abutment portions Q1 and Q2 is shorter than the length of the cylindrical portion Vc of the large-diameter bottle V2. Therefore, when the clamp 30 clamps the large-diameter bottle V2, the clamping member 30A of the common abutment portions Q1 and Q2 only engages with the lower surface of the connecting portion Vb and separates from the flange Vf. Therefore, although the large-diameter bottle V2 is suspended by the engagement of the common abutment portions Q1 and Q2 with the connecting portion Vb, it cannot prevent the vibration of the shaft of the large-diameter bottle V2.

[0047] On the other hand, when the large-diameter bottle V2 is held by clamp 30, such as Figure 5 As shown, the large-diameter bottle abutment portion Q3 engages with the neck Vn. The thickness of the clamping member 30A at the large-diameter bottle abutment portion Q3 is approximately equal to, for example, the length of the cylindrical portion Vc in the large-diameter bottle V2. That is, when the large-diameter bottle V2 is clamped by the clamp 30, the clamping member 30A of the large-diameter bottle abutment portion Q3 fits precisely between the upper surface of the flange Vf and the lower surface of the connecting portion Vb of the large-diameter bottle V2. This prevents axial vibration of the large-diameter bottle V2 clamped by the clamp 30, and allows the large-diameter bottle V2 to be transported in a stable state even when the filler is filled with contents.

[0048] As described above, the conveying system using the clamp of the first embodiment can stably convey resin bottles with necks of different sizes, such as the diameter of the bottle opening. Furthermore, since a large-diameter bottle abutment is used to hold the bottle, the number of abutments is large, so even if the structure is configured such that the large-diameter bottle abutment only abuts against the lower surface of the connecting portion Vb, stable conveying is still possible.

[0049] Next, refer to Figures 6-8 The structure of the clamp for the intermediate wheel in the second embodiment will be described. Furthermore, Figure 6 , Figure 7 , Figure 8 Compared with the first embodiment Figure 3 , Figure 4 , Figure 5 Correspondingly. It should be noted that the only difference from the first embodiment is the structure of the large-diameter bottle abutment portion of the clamp on the intermediate wheel; the other structures are the same as in the first embodiment. For identical structures, the same reference numerals are used, and their descriptions are omitted.

[0050] The clamp 60 of the second embodiment of the intermediate wheel 18 is composed of a pair of clamping members 60A formed symmetrically from left to right. On the inner side of the front end of each clamping member 60A, a recess 62 for holding the neck Vn of the bottle V (V1 or V2) is provided facing each other. The recess 54 of the first embodiment has common abutment portions Q1 and Q2 and a large-diameter bottle abutment portion Q3, but the recess 62 of the second embodiment only has common abutment portions Q1 and Q2.

[0051] like Figure 6 As shown, in the clamp 60 of the second embodiment, at the base end side, between a pair of clamping members 60A, there is an abutment member 64 that engages with the neck Vn of the large-diameter bottle V2 at the same height as the clamping members 60A. The abutment member 64 is arranged along the axis of symmetry of the clamping members 60A and protrudes outward to a position where its front end abuts against the neck Vn of the clamped large-diameter bottle V2. In addition, the abutment member 64 is mounted on a bracket 66, which is supported by a pair of rotating shafts 32 (which are rotatable relative to the bracket 66).

[0052] When the small-diameter bottle V1 is held by the clamp 60, similarly to the first embodiment, the bottle V1 is held only by the common abutment portions Q1 and Q2. Figure 7 As shown, in the second embodiment, the thickness of the clamping member 60A at the common contact portion Q1 and Q2 is approximately equal to the length of the cylindrical portion Vc of the small-diameter bottle V1. Similarly to the first embodiment, the small-diameter bottle V1 is firmly held by the clamp 60.

[0053] On the other hand, when the large-diameter bottle V2 is held by the clamp 60, the neck Vn of the large-diameter bottle V2 engages with the common abutment portions Q1 and Q2, and also engages with the front end of the abutment member 64. For example... Figure 6 As shown, the front end of the abutment member 64 is formed in an arc shape so as to perfectly engage with the outer periphery of the neck Vn of the large-diameter bottle V2, constituting the large-diameter bottle abutment portion Q3. The thickness of the large-diameter bottle abutment portion Q3 of the abutment member 64 is the same as in the first embodiment, corresponding to the cylindrical portion Vc of the large-diameter bottle V2. That is, when the large-diameter bottle V2 is clamped by the clamp 60, the large-diameter bottle abutment portion Q3 of the abutment member 64 abuts against the upper surface of the flange Vf and the lower surface of the connecting portion Vb, fitting perfectly between them (it can also be configured such that the large-diameter bottle abutment portion only abuts against the lower surface of the connecting portion Vb). At this time, the large-diameter bottle V2 is held at a total of five locations: four common abutment portions Q1 and Q2 and one large-diameter bottle abutment portion Q3.

[0054] As described above, even when using the fixture of the second embodiment, the same effect as that of the first embodiment can be obtained.

[0055] Furthermore, in this embodiment, each clamping component has two common abutment portions, but there may also be three or more, and the number of abutment portions for large-diameter bottles may also be two or more. Additionally, the abutment components of the second embodiment can be combined with the clamps of the first embodiment.

[0056] Symbol Explanation

[0057] 10 Conveying and Processing System

[0058] 16. Filler wheel (wheel of upstream equipment)

[0059] 17 Fixtures

[0060] 18 intermediate wheels

[0061] 20. Covering roller (roller of downstream equipment)

[0062] 30 clamps

[0063] 30A Clamping Component

[0064] Q1 and Q2 Jointly Connecting Department

[0065] Q3 Large diameter bottle contact part

[0066] V Resin Bottles

[0067] V1 Small-diameter Bottle (Bottle 1)

[0068] V2 large diameter bottle (2nd bottle)

[0069] Vb Connector

[0070] Vf flange

[0071] Vn neck

[0072] Vt refers to the threaded portion.

Claims

1. A resin bottle conveying and processing system characterized by comprising: Possessing: an upstream-side device that supports the lower surface side of a flange of a resin bottle having a neck portion in which a coupling portion, a cylindrical portion, and a flange are formed in that order below a threaded portion, and performs rotational conveyance; an intermediate wheel that receives the resin bottle from the upstream-side device, grips the neck portion to perform rotational conveyance in a suspended state; and a downstream-side device that supports the resin bottle received from the intermediate wheel on the lower surface side of the flange to perform rotational conveyance, the intermediate wheel has a plurality of grippers in the circumferential direction, the grippers gripping the neck portion of the resin bottle by a pair of gripping members that swing, the gripper of the intermediate wheel possesses: a common abutting portion that is provided to each of the gripping members, and abuts against the neck portion of each resin bottle when gripping a first resin bottle and when gripping a second resin bottle having a neck portion with a larger diameter than the neck portion of the first resin bottle; and a large-diameter bottle abutting portion that is separated from the neck portion of the first resin bottle when gripping the first resin bottle, and abuts against the neck portion of the second resin bottle when gripping the second resin bottle, the common abutting portion has a shape that abuts against the lower surface of the coupling portion and the upper surface of the flange in the neck portion of the first resin bottle when gripping the first resin bottle, abuts against the lower surface of the coupling portion in the neck portion of the second resin bottle when gripping the second resin bottle, and is separated from the upper surface of the flange, the large-diameter bottle abutting portion has a shape that abuts against at least the upper surface of the flange in the neck portion of the second resin bottle when gripping the second resin bottle, the thickness of the gripping member at the large-diameter bottle abutting portion is greater than the thickness of the gripping member at the common abutting portion.

2. The resin bottle conveying system according to claim 1, wherein the large-diameter bottle abutting portion has a shape that abuts against the lower surface of the coupling portion and the upper surface of the flange in the neck portion of the second resin bottle when gripping the second resin bottle.

3. The resin bottle conveying system according to claim 1, wherein the large-diameter bottle abutting portion is provided at a position closer to the inner side of the intermediate wheel than a position in each of the gripping members at which the common abutting portion is provided.

4. The resin bottle conveying system according to claim 1, wherein the large-diameter bottle abutting portion is provided to an abutting member that is disposed between the pair of gripping members, at a position closer to the inner side of the intermediate wheel than the common abutting portion in each of the gripping members.

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