JP6350061B2 - Cap chuck and capping device provided with the chuck - Google Patents

Description

  The present invention relates to a cap chuck that holds a resin cap and winds it around a mouth of a container, and a capping device including the chuck.

  A configuration disclosed in Patent Document 1 is known as a conventional cap chuck. The conventional chuck has a chuck body in which a housing space into which a resin cap is fitted is formed, and the cap is wound around the mouth of the container by rotating the chuck body with the cap held in the housing space. It is configured as follows.

JP 2001-106293 A

  In the conventional chuck, the shape of the accommodation space for holding the resin cap is determined according to the cap attached to the container, and when the outer diameter of the cap to be processed is changed, the chuck has a predetermined size. It was necessary to replace it. The replacement work of the chuck requires a certain time, and the production line provided with the capping device has to be temporarily stopped, resulting in a problem that productivity is lowered.

  SUMMARY OF THE INVENTION An object of the present invention is to improve the productivity of a production line provided with a capping device by making it possible to handle caps having different diameters in the capping device.

The present invention is a cap chuck that holds a cap and winds it around a mouth of a container, and an inner peripheral surface is provided with a convex portion that can be engaged with a longitudinal groove formed on the outer peripheral surface of the cap. The chuck member includes a chuck member, a pressing member that can protrude toward the inner peripheral side through an opening formed in the chuck member, and a biasing member that biases the pressing member toward the inner peripheral side. The chuck member and the small diameter cap chuck member are divided into a plurality of concentric circles, and the small diameter cap chuck members are positioned on the inner peripheral side of the large diameter cap chuck member. Switching between the chuck position and the retracted position where the inner peripheral surface is positioned on the outer peripheral side of the chuck member for the large-diameter cap, and switching the chuck member for the small-diameter cap between the chuck position and the retracted position The provided, wound up a small-diameter cap by the chuck member for small diameter caps by switching the chuck member for small diameter caps to tighten up the small cap on the chuck position, the chucking member for small diameter caps to tighten up the large diameter cap to the retracted position The large-diameter cap is wound and tightened by the chuck member for the large-diameter cap .

  The switching means has, for example, a contact member that contacts the small-diameter cap chuck member, and the contact member and the small-diameter cap chuck are provided so as to be movable relative to the small-diameter cap chuck member. The contact position of the contact member with respect to the small diameter cap chuck member changes according to the position of movement with the member, and the small diameter cap chuck member is set to the chuck position or the retracted position.

  A capping device according to the present invention includes the above-described chuck, and is characterized in that a cap having a longitudinal groove formed on the outer peripheral surface is gripped by the chuck, and the cap is wound around a mouth portion of a container to be supplied.

  According to the present invention, caps having different diameters can be handled without changing the chuck in the capping device, and the productivity of the production line provided with the capping device can be improved.

It is a figure which shows schematic structure of the capping apparatus provided with the chuck | zipper which is embodiment of this invention. It is sectional drawing which shows the chuck | zipper of 1st Embodiment and shows the state which has the chuck member for small diameter caps in a retracted position. It is sectional drawing which follows the III-III line of FIG. It is a front view which shows the chuck member for small diameter caps. It is a top view which shows the cam in the state shown in FIG. It is sectional drawing which shows the chuck | zipper of 1st Embodiment and shows the state which has the chuck member for small diameter caps in a chuck | zipper position. It is sectional drawing which follows the VII-VII line of FIG. It is a top view which shows the cam in the state shown in FIG. It is sectional drawing which shows the chuck | zipper of 2nd Embodiment and shows the state which has the chuck member for small diameter caps in a retracted position. It is sectional drawing which shows the chuck | zipper of 2nd Embodiment and shows the state which has the chuck member for small diameter caps in a chuck | zipper position. FIG. 4 is an enlarged view of a cap, (a) is a side view, and (b) is an enlarged view of a part of FIG. 3.

Hereinafter, the present invention will be described with reference to the illustrated embodiments.
FIG. 1 shows a schematic configuration of a capping apparatus provided with a chuck according to an embodiment of the present invention. The rotating body 11 of the capping device is rotatable around the axis of the rotating shaft 12, and a plurality of capping heads 13 are provided at equal intervals on the outer peripheral edge of the rotating body 11. The capping head 13 protrudes vertically downward from the rotating body 11, and a chuck 20 is provided at the lower end thereof. A gripper 14 is provided below the chuck 20, and the gripper 14 grips the lower side of the flange F formed at the mouth of a plastic bottle (container) P supplied by a conveying means (not shown). The grippers 14 are provided at equal intervals along the outer peripheral edge of the rotating body 11 corresponding to the capping head 13, and are rotatable around the axis of the rotating shaft 12. The chuck 20 moves up and down together with the capping head 13 and approaches the plastic bottle P, and the cap C is wound around and attached to the mouth of the plastic bottle P.

The configuration of the chuck 20 according to the first embodiment will be described with reference to FIGS.
The chuck 20 has a cylindrical housing 21, and the housing 21 is fixed to the capping head 13 (FIG. 1). A cam 22 is fitted at a substantially central height position of the housing 21, and a large-diameter cap chuck member 23 and a small-diameter cap chuck member 24 are provided at the lower end of the housing 21. Three large-diameter cap chuck members 23 and three small-diameter cap chuck members 24 are provided and arranged alternately on a concentric circle (see FIG. 3). That is, the large-diameter cap chuck member 23 and the small-diameter cap chuck member 24 are arranged around the axis of the housing 21 every 60 °.

  As shown in FIG. 3, the large diameter cap chuck member 23 and the small diameter cap chuck member 24 have inner peripheral surfaces 25 and 26 having an arcuate horizontal cross section, and two adjacent large diameter cap chuck members. A small diameter cap chuck member 24 is located between the two. The large-diameter cap chuck member 23 is used when a cap C having a relatively large outer diameter (for example, 30 mm) is wound around the mouth of the PET bottle P, and the small-diameter cap chuck member 24 has a relative outer diameter. It is used when a small cap (for example, 28 mm) is tightened around the mouth of the plastic bottle P. As shown in FIG. 11, a large number of vertical grooves M extending in the vertical direction are formed on the outer peripheral surface of the large-diameter and small-diameter cap C, and the large-diameter cap chuck member 23 and the small-diameter cap chuck member are formed. The inner peripheral surfaces 25 and 26 of 24 are provided with a large number of convex portions T that engage with the longitudinal grooves M formed on the outer peripheral surface of the corresponding cap C.

  The large-diameter cap chuck member 23 is fixed to the outer surface of the housing 21 by bolts 27, and the small-diameter cap chuck member 24 is swingable around the axis of the support pin 28. That is, a support pin 28 is attached to a protruding piece 29 formed on the outer surface of the housing 21 so as to be rotatable about its axis, and the small diameter cap chuck member 24 is fixed to the support pin 28. As will be described in detail later, in the state shown in FIG. 2, the small diameter cap chuck member 24 is in a retracted position in which the inner peripheral surface 26 is positioned on the outer peripheral side of the inner peripheral surface 25 of the large diameter cap chuck member 23. The cap C is wrapped around the mouth of the plastic bottle P by the chuck member 23 for a large-diameter cap.

  Holding grooves 31 and 32 are formed at lower ends of the large-diameter cap chuck member 23 and the small-diameter cap chuck member 24, and O-rings (biasing members) 33 are attached to the holding grooves 31 and 32, respectively. . In addition, openings 34 and 35 are formed in the central portions of the holding grooves 31 and 32 so as to open to the inner peripheral surfaces 25 and 26 of the large-diameter cap chuck member 23 and the small-diameter cap chuck member 24. 35 is provided with a pressing ball (pressing member) 36. The O-ring 33 constantly urges the pressing ball 36, the large-diameter cap chuck member 23, and the small-diameter cap chuck member 24 toward the inner peripheral side, whereby the pressing ball 36 always protrudes from the inner peripheral surfaces 25 and 26. . The outer peripheral sides of the lower end portions of the large-diameter cap chuck member 23 and the small-diameter cap chuck member 24 are covered with a cylindrical fall prevention cover 30 attached to the housing 21 with bolts 27.

  The upper end portion of the small diameter cap chuck member 24, that is, the engaging portion 41 located on the opposite side of the inner peripheral surface 26 with respect to the swing center can be engaged with the cam 22 as a contact member. An O-ring 43 that biases the engaging portion 41 toward the inner peripheral side is attached to the formed holding groove 42 so that the engaging portion 41 is engaged with the cam 22. That is, the O-ring 43 is fitted to the holding groove 42 and the outer peripheral surface of the cam 22. The elastic force of the O-ring 43 is larger than the elastic force of the O-ring 33 provided in the holding grooves 31 and 32, so that the engaging portion 41 always engages with the outer peripheral surface of the cam 22. A fall prevention pin 44 that prevents the O-ring 43 from coming off the holding groove 42 is fixed to the outer peripheral surface side of the holding groove 42.

  As shown in FIG. 5, the cam 22 has a ring shape, and a first cam portion 45 having a relatively large protruding amount and a second cam portion 46 having a relatively small protruding amount are formed every 60 °. . The first cam portion 45 and the second cam portion 46 are formed with recesses 45a and 46a having shapes that match the surface shape of the engaging portion 41, respectively. The cam 22 is rotatable about the axis of the housing 21, that is, around the center of a circle formed by the inner peripheral surfaces 25 and 26 of the large diameter cap chuck member 23 and the small diameter cap chuck member 24. In a state in which the portion 41 is engaged with the first cam portion 45 or the second cam portion 46, the cam 22 is fitted into the recess 45a or 46a, so that it does not rotate freely. In the state shown in FIG. 5, the engaging portion 41 of the small diameter cap chuck member 24 is engaged with the second cam portion 46. Accordingly, the chuck member 24 for the small diameter cap is in a retracted position in which the engaging portion 41 is positioned relatively inside and the inner peripheral surface 26 is positioned on the outer peripheral side of the inner peripheral surface 25 of the large diameter cap chuck member 23. Yes (see FIG. 2).

6 to 8 show a state in which the small diameter cap chuck member 24 is used.
In this state, the cam 22 is set at a rotational position different from the state shown in FIGS. 2 to 5, and the engaging portion 41 of the small diameter cap chuck member 24 is engaged with the first cam portion 45 of the cam 22. . As a result, the chuck member 24 for the small-diameter cap is in a chuck position where the inner peripheral surface 26 is located on the inner peripheral side of the inner peripheral surface 25 of the large-diameter cap chuck member 23, and the cap C to the mouth of the plastic bottle P is placed. The tightening is performed by the small diameter cap chuck member 24.

  As described above, in the first embodiment, the chuck member is divided into the large-diameter cap chuck member 23 and the small-diameter cap chuck member 24, and a plurality of chuck members are alternately arranged on a concentric circle. The engagement position of the engagement portion 41 with respect to the cam 22 changes according to the rotation position, and the small diameter cap chuck member 24 is set to the chuck position or the retracted position.

Next, the operation of the first embodiment will be described.
When the large-diameter cap C is wound around the mouth of the plastic bottle P, the second cam portion 46 of the cam 22 is engaged with the engaging portion 41 of the small-diameter cap chuck member 24 as shown in FIGS. The rotational position is set. Accordingly, the small diameter cap chuck member 24 is in the retracted position, and only the inner peripheral surface 25 of the large diameter cap chuck member 23 is engageable with the cap C, and the small diameter cap chuck member 24 is separated from the cap C. doing. In this state, the cap C held by the pressing ball 36 of the large diameter cap chuck member 23 is supplied from above to the mouth of the plastic bottle P, and the convex portion of the large diameter cap chuck member 23 is the outer periphery of the cap C. Engage with the vertical groove on the surface. Next, when the housing 21 rotates around the axis, the cap C is rotated and wound around the mouth of the plastic bottle P.

  When the small-diameter cap C is wound around the mouth of the plastic bottle P, the cam 22 of the cam 22 is engaged with the engaging portion 41 of the small-diameter cap chuck member 24 as shown in FIGS. The rotational position is set. Accordingly, the small diameter cap chuck member 24 is in the chuck position, and only the inner peripheral surface 26 of the small diameter cap chuck member 24 is engageable with the cap C, and the large diameter cap chuck member 23 is separated from the cap C. doing. In this state, the cap C held by the pressing ball 36 of the small-diameter cap chuck member 24 is supplied from above to the mouth of the PET bottle P, and the convex portion of the small-diameter cap chuck member 24 is formed on the outer peripheral surface of the cap C. Engage with the longitudinal groove. Next, when the housing 21 rotates around the axis, the cap C is rotated and wound around the mouth of the plastic bottle P. Note that the rotation position of the cam 22 may be switched manually or automatically.

  As described above, the first embodiment is configured such that the small diameter cap chuck member 24 can be switched between the chuck position and the retracted position only by changing the rotational position of the cam 22. Therefore, when a plurality of types of caps are handled in a production line provided with a capping device, it is not necessary to replace the chuck, so that the time required for mold change can be shortened and productivity is improved.

  9 and 10 show the chuck according to the second embodiment, FIG. 9 shows a state in which the small diameter cap chuck member 24 is in the retracted position, and FIG. 10 shows a state in which the small diameter cap chuck member 24 is in the chuck position. ing.

  The small diameter cap chuck member 24 can swing around the axis of the support pin 28 provided on the protruding piece 29 of the housing 21 as in the first embodiment. A spring 52 is provided between the plate-like member 51 fixed to the tip of the protruding piece 29 and the small diameter cap chuck member 24, and the upper end portion of the small diameter cap chuck member 24, that is, the engaging portion 53 is always housed by the spring 52. It is biased to the 21 side. The engaging portion 53 is formed with a vertical portion 53a and an inclined portion 53b.

  A cylindrical member (abutting member) 54 with which the engaging portion 53 can engage is fitted to the housing 21 so as to be movable up and down. That is, the cylindrical member 54 is displaceable along the center axis of a circle formed by the inner peripheral surfaces 25 and 26 of the large diameter cap chuck member 23 and the small diameter cap chuck member 24. The cylindrical member 54 is always urged downward by a spring 56 provided between the cylindrical member 54 and a locking portion 55 provided at the upper portion of the housing 21.

  Further, the cylindrical member 54 can rotate around its axis with respect to the housing 21. The housing 21 is provided with support pins 57 that extend in the horizontal direction and protrude from the outer peripheral surface of the housing 21. The cylindrical member 54 is formed with a pair of long holes 58 and a pair of recesses 59 with which the support pins 57 can be engaged. The pair of long holes 58 extend in the axial direction of the tubular member 21 and are formed in the wall portions facing each other across the axial center. The pair of recesses 59 is formed at the lower end of the cylindrical member 54 and is formed at a position rotated by 90 ° around the axial center with respect to the long hole 58.

  When the small diameter cap chuck member 24 is set at the retracted position (FIG. 9), the concave portion 59 of the cylindrical member 54 is engaged with the support pin 57, and the cylindrical member 54 is fixed at the raised position. Thus, the inclined portion 53b of the engaging portion 53 of the small diameter cap chuck member 24 engages with the cylindrical member 54, and the inner peripheral surface 26 of the lower end portion is retracted relatively outward. Therefore, only the large diameter cap chuck member 23 can be engaged with the cap. On the other hand, when the small diameter cap chuck member 24 is set at the chuck position (FIG. 10), the end of the long hole 58 of the cylindrical member 54 is engaged with the support pin 57, and the cylindrical member 54 is fixed at the lowered position. To do. As a result, the engaging portion 53 of the small diameter cap chuck member 24 has the vertical portion 53a engaged with the side surface of the cylindrical member 54, and the inner peripheral surface 26 of the lower end portion advances relatively inward. Therefore, only the small diameter cap chuck member 24 can be engaged with the cap.

  As described above, in the second embodiment, the engagement position of the engagement portion 53 of the small diameter cap chuck member 24 with respect to the tubular member 54 changes according to the height position of the tubular member 54 with respect to the housing 21. The small diameter cap chuck member 24 is set to the chuck position or the retracted position.

  Therefore, the second embodiment can provide the same effects as those of the first embodiment.

20 chuck 22 cam (contact member)
23 Chuck member for large diameter cap 24 Chuck member for small diameter cap 25, 26 Inner peripheral surface 33 O-ring (biasing member)
34, 35 Opening 36 Pressing ball (pressing member)
41 engaging portion 54 cylindrical member (contact member)

Claims (3)

A cap chuck that holds the cap and winds it around the mouth of the container,
A chuck member provided with a convex portion engageable with a longitudinal groove formed on the outer peripheral surface of the cap on the inner peripheral surface;
A pressing member capable of projecting to the inner peripheral side through an opening formed in the chuck member;
An urging member that urges the pressing member toward the inner peripheral side,
The chuck member is divided into a large diameter cap chuck member and a small diameter cap chuck member, and a plurality of chuck members are alternately arranged on a concentric circle,
The chuck member for the small diameter cap has a chuck position in which the inner peripheral surface is located on the inner peripheral side of the chuck member for the large diameter cap, and a retracted position in which the inner peripheral surface is positioned on the outer peripheral side of the chuck member for the large diameter cap. Provided to be swingable, and provided with switching means for switching the chuck member for the small diameter cap between the chuck position and the retracted position ,
When tightening the small-diameter cap, the small-diameter cap chuck member is switched to the chuck position, and the small-diameter cap chuck member is tightened with the small-diameter cap chuck member, and when tightening the large-diameter cap, the small-diameter cap chuck member is in the retracted position. A cap chuck characterized in that it is switched and the large-diameter cap is wound up by the large-diameter cap chuck member .   The switching means includes a contact member that contacts the chuck member for the small-diameter cap, and the contact member is provided so as to be movable relative to the chuck member for the small-diameter cap. The contact position of the contact member with respect to the small diameter cap chuck member changes in accordance with the position of movement with the small diameter cap chuck member, and the small diameter cap chuck member is set to a chuck position or a retracted position. The chuck for a cap according to claim 1. A chuck according to claim 1 or claim 2,
A capping device characterized in that a cap having a longitudinal groove formed on an outer peripheral surface is gripped by the chuck, and the cap is wound around a mouth portion of a container to be supplied.

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