JP2004090951A - Capper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately carry out respective capping operations by improving a mechanism relating with the holding/releasing of a cap. <P>SOLUTION: A capper includes a spring 23 for applying force to a sleeve 21 or a bottom cover 22 downward against a spin body 19 or a housing 20; a chuck 16 for holding the cap 2 to be coupled with/decoupled from the sleeve 21 and the bottom cover 22 via a magnetic clutch 18; and a knock-out pin 13 which can rise/lower along the center axis of the chuck 16. A knock-out rod 15 is provided at the center of a spindle unit 8, for causing the knock-out pin 13 to protrude relatively downward from the chuck 16 by bringing the rear end of each knock-out pin 13 into contact when the spindle unit 8 is raised for defining the retreating end. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a capping device that seals the mouth of a container such as a bottle can, a plastic bottle, and a bottle with a cap. In particular, the present invention relates to a capping device suitable for a screw type.
[0002]
[Prior art]
Conventionally, as a device for sealing the mouth of a container with a screw-type cap, a metal screwless cap is placed over the mouth of a container formed with external threads, and a threaded roll is brought into contact with the peripheral surface of the cap. A roll-on capping device that forms a female screw along with a male screw, and a cap that screws and rotates a resin cap that has a female screw formed on the inner peripheral surface into the mouth of a container with a male screw. Devices are known.
[0003]
As a capping device, a multi-capping device provided with a spindle unit rotatably and vertically movable and capable of selectively attaching a capping head corresponding to various capping to a lower portion of the spindle unit is disclosed in, for example, Japanese Patent Application Laid-Open No. -11387, JP-A-1-23983, and the like.
[0004]
Such a multi-capping device is configured as a rotary type that is rotated and conveyed about a fixed axis, a plurality of spindle units are disposed around a rotating frame turret, and the frame turret rotates about the fixed axis. Thus, each spindle unit is rotated via a drive gear, and the spindle unit is moved up and down via a cam mechanism. Then, a capping head selectively attached to the lower portion of the spindle unit according to each capping form rotates and moves up and down to perform a capping operation.
[0005]
The multi-capping apparatus described in the above publication can be exchanged while sharing a rotation drive mechanism and a cam mechanism for rotating the spindle unit and the molding head so that various molding heads can be selectively attached to the lower portion of the spindle unit. It is configured as follows.
[0006]
On the other hand, as a screw head attached to the lower part of the spindle unit, means for magnets constituting a magnetic clutch are arranged so as to be opposed to each other with a gap between them being adjustable, and the cap is held by the capping head and attached to the container mouth. Are known (for example, Japanese Utility Model Application Laid-Open No. 61-48194, Japanese Utility Model Application Laid-Open No. 63-186698, Japanese Utility Model Application Laid-Open No. 2-52793, etc.).
[0007]
[Problems to be solved by the invention]
However, when the screw head is mounted on the multi-capping device and operated, there are the following problems.
[0008]
The cap is gripped by the chuck attached to the lower part of the screw head, moved on the transport line of the container, lowered, covered on the container opening, and pressed against the container opening by a spring mosquito. The chuck rotates via the magnetic clutch, and the cap is screwed with the external thread of the container mouth, and tightened into the container mouth.
[0009]
However, when the screw portion of the cap or the container mouth is not formed properly, or when the grip is loose due to the wear amount of the chuck or the like, the screw is not screwed into the male screw formed at the mouth of the container. As a result, it may return to the initial state of the capping process while remaining in the chuck, causing a problem that the jam or the cap may be damaged, or for the jam clearance, it is necessary to stop the apparatus and remove the cap remaining on the chuck. However, there is a problem that the operation rate is lowered.
[0010]
Also, when the screw head is lowered and the cap is gripped by the chuck, the pressing member provided in the chuck is constantly urged downward as a pressing force, so that the pressing member resists the pressing force. Since the cap is fitted into the chuck while being pushed upward, there is a problem that the cap is easily dropped downward from the chuck. In order to prevent the cap from falling off the chuck, it is necessary to hold the cap with a force to which the pressing force of the pressing member is applied, thereby causing a problem that the resin cap is easily damaged or deformed.
[0011]
The present invention has been made in view of the above technical problem, and in a versatile multi-capping device capable of selectively mounting various capping heads, when used as a screw type, a screw head cap To provide a capping device capable of preventing a cap from remaining in a chuck at the time of capping and capable of mounting a screw head that is prevented from being damaged by a gripper of a cab during capping. The purpose is to:
[0012]
Means for Solving the Problems and Their Functions
In order to achieve the above object, according to the first aspect of the present invention, a synthetic resin cap having an internal thread formed on an inner peripheral surface thereof is screwed and rotated on a mouth of a container having an external thread formed thereon. A screw head for attaching the cap to the container opening, wherein the screw head is moved up and down while being moved in synchronization with the container and is selectively attached to a lower end portion of a spindle unit which is rotated. A screw head, an upper holding member attached to a lower end portion of the spindle unit, a lower holding member that is arranged coaxially with the upper holding member, and that can move up and down and rotate integrally with the upper holding member; A spring for urging the lower holding member downward with respect to the upper holding member; And a knockout pin that can move up and down along the center axis of the chuck, and the rear end of the knockout pin is brought into contact with the center of the spindle unit when the spindle unit is raised. The knockout pin is provided with a retracted end position defining means for defining the retracted end so that the knockout pin projects relatively downward with respect to the chuck.
[0013]
Therefore, according to the first aspect of the present invention, among the molding heads selectively mounted at the lower part of the spindle unit, in the case of the screw type, the spindle unit is lowered and the chuck attached to the tip of the screw head is moved downward. The grasped cap is put on the container mouth and fastened to the container mouth. Next, as the screw head moves up together with the spindle unit, the normally capped cap is removed from the chuck because it is tightened in the container. If the cap remains inside, the rear end of the knockout pin abuts the position defining end and causes the knockout pin to protrude downward relative to the chuck, so that the cap rises while being fitted to the chuck. Even so, it is forcibly knocked out until the next capping operation is performed, and is separated from the screw head.
[0014]
Further, the invention according to claim 2 is the device, wherein the knockout pin is elastically held by being urged upward by a sleeve member extending above the chuck.
[0015]
In the invention described in claim 2, the knockout pin is urged upward and elastically held in a sleeve extending above the chuck, so that the screw head moves down together with the spindle unit and the cap is lowered. When gripping the cap, the knockout pin is urged upward via the elastic body relative to the chuck, and can be retracted to a position that does not affect the insertion of the cap.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the present invention will be described with reference to specific examples. FIG. 1 is a partial longitudinal sectional view showing a part of a capping device used as a screw capper according to the present invention, and a resin screw having a damper evidence function is provided at a mouth of a metal or resin bottle type container 1. The cap 2 is configured to be tightened.
[0017]
A molding table 3 on which the containers 1 are placed at regular intervals is rotatably held by a fixed shaft 4 that is vertically erected. On the upper surface of the molding table 3, a body guide 5 in which a non-rotating rubber ring 5 </ b> A for holding the body of the container 1 is housed, and an adjustable center guide for holding the mouth of the container 1. A plurality of sets 6 and outer guides 6 ′ are provided in accordance with the pitch of the mounting portion of the container 1.
[0018]
Above the molding table 3, there is provided a frame turret 7 that rotates about the fixed shaft 4 integrally with the molding table 3. In the example shown in FIG. 1, the frame turret 7 is composed of three upper, middle, and lower disk portions 7A, 7B, and 7C, and is held by the molding table 3 at the outer peripheral portion of the frame turret 7. A spindle unit 8 is held at a position corresponding to a position vertically above the container 1 which is located.
[0019]
The spindle unit 8 is vertically moved with respect to the container 1 and is rotatably driven. The hollow shaft 9 is disposed on the outer peripheral side of the hollow shaft 9 and is not used for screw capping at the lower end. A cone cam 10 and a sleeve 11 for capping are provided in advance. Further, a screw head 12 (see FIG. 3) that rotates together with the hollow shaft 9 and moves up and down is attached to the lower end of the spindle unit 8.
[0020]
As shown in FIG. 2, the screw head 12 has a knockout pin 13 provided along the center axis thereof and a rear end portion of the knockout pin 13 in contact with each other to define a limit position for the work. A knockout rod 15 having an end 14A is provided. The upper end of the knockout rod 15 is fixed to a bracket 62 projecting from the disk portion 7A of the frame turret 7 with a screw.
[0021]
As shown in FIG. 1 or 5, the bracket 62 has a shape obtained by bending a plate at substantially right angles, and is fixed to the upper surface of the disk portion 7A. Further, a male screw is formed at a distal end portion 14B of the knockout rod 15 in a direction opposite to the position defining end 14A, and the distal end portion 14B passes through a hole 62C of the bracket 62. Knockout rod 15 is fixed to bracket 62 with nuts 63 and 64. The bracket 62 has two holes 62C into which the distal end portion 14B of the knockout rod 15 is inserted so that the knockout rod 15 and another knockout rod 15 adjacent thereto can be fixed as shown in FIG. It is provided in.
[0022]
The position defining end 14A is configured to define a position where the knockout pin 13 of the screw head 12 is raised when the screw head 12 is raised. And a knockout pin 13 for removing the remaining screw cap 2 from the screw head 12.
[0023]
The screw head 12 shown in FIG. 2 has, for example, a structure in which a resin screw cap 2 for a PET bottle is attached to the mouth of the container 1, and has a vertical fit with a knurl processed on the side surface of the screw cap 2. A chuck 16 for holding the screw cap 2 while enclosing it with the grooved inner peripheral surface, and a plurality of balls 17 which are located at the tip of the chuck 16 and hold the screw cap 2 while pressing the outer surface of the screw cap 2; An elastic body (rubber ring in the present embodiment) 17A for urging the plurality of balls 17 inward in the radial direction, and a magnetic clutch 18 for preventing excessive tightening torque of the screw cap 2 are provided.
[0024]
Further, the screw head 12 is disposed coaxially with the spin body 19 or the housing 20 and the spin body 19 or the housing 20 attached to the lower end of the spindle unit 8. A sleeve 21 or a bottom cover 22 that can rotate as a unit, a spring 23 that urges the sleeve 21 or the bottom cover 22 downward with respect to the spin body 19 and the housing 20, and a sleeve 21 or a bottom cover that grips the cap 3 The chuck unit 24 includes a chucking portion 24 connected / disconnected to / from the chuck 22 via a magnetic clutch 18, and a knockout pin 13 that can move up and down along the center axis of the chuck 16. The spindle When the knit 8 is raised (shown in FIG. 3), the knockout portion 25 protrudes downward relative to the chuck 16 by abutting the rear end of each knockout pin 13 to define the retreating end. A knockout rod 15 is provided. The transmission torque of the magnetic clutch 18 is adjusted by changing the height of the bottom cover 22 with respect to the sleeve 21 by changing the thickness of the shim 61.
[0025]
The knockout pin 13 is configured to be elastically held by being urged upward by a chuck sleeve 26 extending above the chuck 16 as described later.
[0026]
Further, as shown in FIG. 4, the chucking portion 24 is provided with a chuck 16 provided with a vertical groove inside which can fit the cap 2 inside the cylindrical shape, and when the cap 2 is inserted. A ball 17 that contacts the side surface of the cap 2, an elastic body 17A that urges the ball 17 inward in the radial direction, and is provided between the knockout pin 13 and the chuck 16 provided on the upper portion of the chuck 16. And a chuck sleeve 26 which is elastically held by a hold spring 27 provided.
[0027]
Further, the chuck sleeve 26 is attached to an inner race of a bearing 60 inscribed in a lower portion of the sleeve 21, and an upper end thereof is fixed by a nut 28 for preventing the chucking portion 24 from coming off. When inserting the cap 2 into the chuck 16, a knock-out pin stopper 29 is provided on the inner surface of the chuck sleeve 26 so that the lower end of the knock-out pin 13 is not excessively inserted into the spindle 8. , And extends upward through the center hole of the knockout pin stopper 29 so as to face the knockout rod 15.
[0028]
Note that the upper holding member refers to the spin body 19 and the housing 20, the lower holding member refers to the sleeve 21 and the bottom cover 22, and the chucking portion 24 includes the chuck 16, the ball 17, and the elastic member. 17A, the chuck sleeve 26, and the knockout portion 25 indicate the knockout pin 13, the knockout rod 15, the knockout pin stopper 29, and the hold spring 27.
[0029]
Here, a cam mechanism for vertically moving the spindle unit 8 will be described. Between the lower disk portion 7C and the intermediate disk portion 7B of the frame turret 7, the radial direction from the fixed shaft 4 is set. A frame body 30 extending outward is provided. Two cam grooves 31 </ b> A and 31 </ b> B are formed in the upper and lower two places on the outer peripheral surface of the frame 30 along the circumferential direction.
[0030]
A cam follower 32A engaged with the upper cam groove 31A in FIG. 1 is connected to a cylindrical member 10A that rotatably holds the hollow shaft 9 of the screw head 12. The cam follower 32B engaged with the lower cam groove 31B in FIG. 1 is connected to the sleeve 11 integrated with the cone cam 10 and is used at the time of roll-on capping.
[0031]
Next, a mechanism for rotating the screw head 12 via the spindle unit 8 will be described. In the example shown in FIG. 1, in order to simplify the configuration of the entire apparatus, a single power source is configured to perform all operations, and the frame turret 7 is rotated together with the forming table 3. The hollow shaft 9 and the screw head 12 attached thereto are rotated. Specifically, a sun gear 33 is fixed to a portion of the upper portion of the fixed shaft 4 slightly below the upper disk portion 7A. A planetary gear 34 meshing with the sun gear 33 is rotatably held by an upper disk portion 7A of the frame turret 7.
[0032]
At a position adjacent to the planetary gear 34, a first rotary shaft 35 penetrating the upper disk portion 7A is provided, and a lower end of the rotary shaft 35 has an intermediate portion meshed with the planetary gear 34. A drive timing pulley 37 is attached to an end to which the gear 36 is attached and which protrudes above the disk portion 7A. Further, at a position close to each spindle unit 8 at an outer peripheral portion of the upper disk portion 7A, an end portion rotatably held at an intermediate disk portion 7B through the upper disk portion 7A is held. Two rotation shafts 38 are provided. A driven timing pulley 39 paired with the drive timing pulley 37 is attached to an end of the second rotating shaft 38 protruding above the upper disk portion 7A. A driven gear 40 is attached to an intermediate portion of the second rotating shaft 38, that is, a portion located between the upper disk portion 7A and the intermediate disk portion 7B. The driven gear 40 meshes with an elongated gear 41 provided on the outer peripheral portion of the hollow shaft 9.
[0033]
Then, as shown in FIG. 5, a timing belt 42 is wound around one predetermined drive timing pulley 37 and two driven timing pulleys 39 and 39 adjacent to each other. Further, a belt tensioner 43 is provided to press the slack side portion of the timing belt 42 toward the center of the travel path of the timing belt 42, so that the timing belt 42 has an extra length.
[0034]
Therefore, according to the above configuration, since the timing belt 42 and each of the timing pulleys 37 and 39 are disposed above the upper disk portion 7A, they can be easily replaced. The belt length accompanying the change in the number of teeth can be easily adjusted by the belt tensioner 43. That is, these mechanisms change the rotation ratio between the drive timing pulley 37 and the driven timing pulley 39, that is, the rotation ratio between the planetary gear 34 and the spindle unit 8 by changing the number of teeth by replacing the drive timing pulley 37. Thus, the ratio of the rotation speed to the revolution speed of the screw head 12 can be changed. Thereby, the spin number at the time of screw capping can be changed.
[0035]
Further, in the above-described configuration, the two driven timing pulleys 39 and the spindle unit 8 correspond to one planetary gear 34 and the drive timing pulley 37 to which torque is transmitted from the planetary gear 34. The number of the drive timing pulleys 37 to which the torque is transmitted from the planetary gears 34 may be half of the number of the spindle units 8 and the screw heads 12, so that the configuration of the entire apparatus can be simplified.
[0036]
Next, the operation when used in the above-described screw head 12 will be described. Before the container 1 covered with the screw cap 2 made of resin is supplied to a predetermined position of the molding table 3, the screw head 12 is raised to the upper limit position. FIG. 6 shows this state. In the cam diagram of FIG. 12, the state is {circle around (1)}, which corresponds to the top dead center in the vertical movement by the upper cam groove 31A and the cam follower 32A.
[0037]
When the forming table 3 and the frame turret 7 rotate integrally around the fixed shaft 4, the cam follower 32A is gradually lowered according to the shape of the cam groove 31A, and a knockout provided at the center of the screw head 12 is formed. The pin 13 is retracted substantially above the chuck 16, and the screw cap 2 pushes the plurality of balls 17 provided on the distal end side of the chuck 16 radially outward without contacting the top surface of the cap 2. The screw cap 2 is held in the fitted state while being pressed into the chuck 16 and pressing the side surface of the screw cap 2 with the ball. This state is shown in FIG. In the cam diagram of FIG. 12, the state is (2), which corresponds to a position one step lower than the top dead center.
[0038]
When the frame turret 7 rotates about the fixed shaft 4, the screw cap 2 is transported to a position directly above the container 1. The state is shown in FIG. In the cam diagram of FIG. 12, the state is (3), which corresponds to the same position as the state (2). On the other hand, since the planetary gear 34 rolls while meshing with the sun gear 33, torque is transmitted to the planetary gear 34 and the planetary gear 34 rotates on its own. Therefore, torque is transmitted to the hollow shaft 9 via the planetary gear 34 and the intermediate gear 36, the timing pulleys 35 and 39, the timing belt 42, the driven gear 40, and the elongated gear 41. As a result, the screw head 12 rotates together with the hollow shaft 9. Then, when it descends, the screw cap 2 is tightened by the screw head 12.
[0039]
The screw cap 2 is tightened with a fixed tightening torque. However, when excessive tightening torque that adversely affects the cap opening torque is generated, the magnetic clutch 18 operates to prevent the torque from being transmitted, and the torque transmission is performed. Will be shut off.
[0040]
Further, by replacing the drive timing pulley 37, the rotation speed ratio between the drive timing pulley 37 and the driven timing pulley 39, that is, the ratio of the rotation speed to the revolution speed of the screw head 12 can be changed. As a result, the hermeticity between the container 1 and the cap 2 can be reliably ensured, and the number of spins of the screw head 12 can be adjusted. An appropriate number of spins can be set according to the effective number of turns of the internal thread of the cap 2 (1.4 to 1.7 depending on the application), and re-tightening due to an excessive number of spins during capping work The phenomenon can be prevented as much as possible, the influence on the opening force can be reduced, and the durability of the device can be ensured.
[0041]
Thus, when the screw head 12 rotates a predetermined number of times, the tightening of the screw cap 2 ends. This is the state shown in FIG. In the cam diagram in FIG. 12, the state is (4), which corresponds to the bottom dead center position.
[0042]
When the frame turret 7 further rotates from this state, the upper cam follower 32A in FIG. 1 moves upward according to the shape of the cam groove 31A, and as a result, the entire screw head 12 is pulled up above the container 1. Then, when the top dead center is reached, a series of processes ends. This state is shown in FIG. 10. In the cam diagram of FIG. 12, the state returns to the top dead center position in the state of (5). Even if the screw cap 2 remains on the chuck 16 due to some abnormality (miscap, slip, etc.), the knockout pin 13 is provided on the rear end of the knockout rod 15 as shown in FIG. The cap 2 is protruded downward against the hold spring 27, and the cap 2 remaining in the chuck 16 is securely removed. On the other hand, the normally capped cap is attached to the container 1 and detached from the chuck 16 by itself, discharged from the molding table 3 to a predetermined location, and sent to the next step such as inspection and packing. At this time, it is preferable to provide a means for appropriately detecting the contact force of the knockout rod 15, for example, an electric pressure detection mechanism at a fixed portion of the rod to detect an abnormality and stop the apparatus.
[0043]
In the specific example described above, an example in which the present invention is applied to a capping device in which the screw cap 2 made of resin is screwed into the mouth of a predetermined container 1 has been described, but the roll-on head 44 (shown in FIG. 13) is used. Since the assembly portion with the screw head 12 is shared, one capping device can cap both the roll-on capper for bottle cans and the screw capper for plastic bottles. Therefore, when performing roll-on capping, the screw head 12 may be replaced with the roll-on head 44.
[0044]
At the time of the replacement, since the spindle unit 8, the cone cam 10, and the knockout rod 15 are provided as basic components of the present apparatus, only the molding head excluding these is replaced. For example, when replacing the screw head 12 with a roll-on head 44 as shown in FIG. 13, the chuck 16, the magnetic clutch 18, the spin body 19, the housing 20, the sleeve 21 and the like which are the main components of the screw head 12 are used. The lock roll 45, the threaded roll 46, the cam follower 47, the torsion spring 48, the pressure pin 65, and the like, which are main components of the roll-on head 44, are mounted.
[0045]
Further, in the above-described specific example, as shown in FIG. 14, a centering jig 49 for the screw head 12 (tapered tip) is fitted or clamped to the inner peripheral portion of the chuck sleeve 26 and the neck guide 6 and the Centering of the body guide 5 can be performed.
[0046]
Further, in the specific example described above, the fitting structure in the sliding portion between the spin body 19 and the sleeve 21 is replaced with a conventional method in which a circular cross section is provided with a sliding key or a lock pin, as shown in FIG. By making the tip of the spin body 19 into a polygonal shape, for example, a hexagonal shape 50 and making one of the fitting portions on the sleeve 21 side into a polygonal shape, for example, a hexagonal hole shape 51, the spin body 19 and the sleeve 21 are formed. By using a hexagonal shape coupling for the fitting structure, the machining of the fitting surface can be easily and accurately finished, and the torque transmission force is received on a flat surface, so that the durability of the parts can be improved. .
[0047]
Further, in the specific example, the knockout pin 13 is elastically held by the hold spring 27, but may be a rubber elastic body or an air pressure instead.
[0048]
【The invention's effect】
As described above, according to the first aspect of the invention, when the screw head is attached to the lower end of the spindle unit, the screw head moves in synchronization with the container in which the cap is fitted to the mouth, and during that time, The screw head moves up and down with respect to the container. By lowering the screw head, the cap is fitted with the chuck, and screwed and rotated in that state, whereby the cap is tightened. When the screw head is raised together with the spindle unit, the knockout pin protrudes downward with respect to the chuck. Therefore, even if the cap is raised while being fitted to the chuck due to some abnormality, this is knocked out and detached from the chuck. As a result, the insertion and removal of the cap with respect to the chuck are reliably performed, and each capping operation is suitably performed.
[0049]
According to the second aspect of the present invention, when the screw head descends and grips the cap, the knockout pin is urged upward via the elastic body relatively upward with respect to the chuck, thereby affecting the insertion of the cap. It is possible to retreat to a position where it does not. As a result, the cap is securely inserted and removed from the chuck, and the cap can be prevented from being damaged, so that each capping operation is suitably performed.
[Brief description of the drawings]
FIG. 1 is a partial longitudinal sectional view showing a part of a capping device to which the present invention is applied.
FIG. 2 is a partial longitudinal sectional view of a screw type head to which the present invention is applied.
FIG. 3 is a partially enlarged longitudinal sectional view of a screw type head to which the present invention is applied.
FIG. 4 is a partially enlarged longitudinal sectional view of a screw type head to which the present invention is applied.
FIG. 5 is a partial plan view of a capping device to which the present invention is applied.
FIG. 6 is an explanatory diagram showing an initial state of a capping step of a screw cap.
FIG. 7 is an explanatory view showing a cap gripping step of the screw cap capping step.
FIG. 8 is an explanatory view showing a cap tightening step of the screw cap capping step.
FIG. 9 is an explanatory view showing the end of the cap tightening step in the screw cap capping step.
FIG. 10 is an explanatory view showing a state in which the process returns to the top dead center and moves to the next step after the cap tightening in the capping step of the screw cap is completed.
FIG. 11 is an explanatory diagram showing a detached state of the cap remaining in the chuck in a step of ending the cap tightening step of the screw cap capping step.
FIG. 12 is a cam diagram for explaining the operation angles of a cam mechanism (upper cam) and a lower cam mechanism (lower cam) shown in the upper part of FIG.
FIG. 13 is a partial longitudinal sectional view of a roll-on type showing an example of an embodiment of the present invention.
FIG. 14 is an explanatory view showing a centering jig used for centering each guide of a capping device using a screw type to which the present invention is applied.
FIG. 15 is an explanatory diagram showing a housing and a sleeve in a screw head fitting structure to which the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Container, 2 ... Screw cap, 8 ... Spindle unit, 12 ... Screw head, 13 ... Knockout pin, 15 ... Knockout rod, 16 ... Chuck, 19 ... Spin body, 20 ... Housing, 21 ... Sleeve, 22 ... Bottom cover , 23 ... Spring.

Claims (2)

A screw head for screwing and rotating a cap made of a synthetic resin having an internal thread formed on an inner peripheral surface of the container at the mouth of the container having the external thread formed thereon and attaching the cap to the mouth of the container comprises the container. A capping device that can be selectively attached to the lower end of a spindle unit that is raised and lowered and rotated while moving in synchronization with
The screw head, an upper holding member attached to a lower end portion of the spindle unit, a lower holding member that is disposed coaxially with the upper holding member and that can move up and down and rotate integrally with the upper holding member, A spring that urges the lower holding member downward with respect to the upper holding member, a chuck that grips the cap and is connected / disconnected to the lower holding member via a magnetic clutch, and a center of the chuck. A knockout pin that can move up and down along the axis, and when the spindle unit is lifted up against the center of the spindle unit, the rear end of the knockout pin abuts to define a retreat end. That a retracting end position defining means for projecting the knockout pin downward relative to the chuck is provided. Capping apparatus according to symptoms. The capping device according to claim 1, wherein the knockout pin is elastically held by being urged upward by a sleeve member extending above the chuck.

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