JP2004331176A - Capping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capping device which prevents formation of scratched roll marks on a cap after screw forming by specifying a circumferential location of a male screw portion formed on a container mouth portion before screw forming in a cap, and exhibits an excellent effect at the time of opening or re-opening the cap. <P>SOLUTION: The capping device is formed of a holding portion (container mounting stand 43) which is rotatable and holds the container at a location that allows the forming rolls to mold a screw in the cap; and a location setting means (rotation control mechanism) which rotates the container together with the holding portion so that the male screw portion of the container mouth is set to a circumferentially predetermined location with respect to a specific location at which the forming rolls abut on the outer peripheral surface of the cap, before they abut on the outer peripheral surface of the cap. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, a cylindrical cap with a bottom is put on a mouth (mouth neck) of a container in which a screw groove (male screw part) is formed in advance, and a screw groove (female screw part) is formed on a peripheral surface of the cap. The present invention relates to a capping device for molding.
[0002]
[Prior art]
Conventionally, as a roll-on type capping device, a forming head is moved up and down to open and close a forming roll provided on the forming head (to approach or separate an outer peripheral surface of a cap having no thread groove), and a forming roll is attached to the cap. There is known a method in which a screw groove is formed by press-contacting (hereinafter, referred to as screw forming).
[0003]
For example, the device described in Patent Document 1 is configured to perform capping while forming a screw on a cap fitted to the mouth and neck of a container. That is, the apparatus described in Patent Document 1 is configured to press a forming roll from the outer peripheral side of the cap over the mouth and neck of the container to perform female screw forming. This forming roll needs to go through steps such as moving the cap to the outer peripheral side and retreating to the initial position after screw forming. Therefore, in the device described in the above-mentioned Patent Document 1, a controlled radial force is used to deform and attach the cap around the mouth of the container by the axial displacement of the conical cam (cone cam). The forming roller moves along a predetermined locus by using a cam mechanism that acts on the roller, and performs a predetermined screw processing.
[0004]
The cap to be used in this type of apparatus is generally made of an aluminum alloy or a thin steel plate and has good workability, and the load for pressing the forming roller against the cap is, for example, a torsion spring. It is generated by an elastic member. Accordingly, the cam mechanism is configured to guide the forming roller to the outer peripheral surface of the cap and to function to retreat. In other words, the cam mechanism is configured to have a function of moving the forming roller to the so-called center side facing the cap by the axial displacement of the cone cam, and the forming load on the cap is generated exclusively by the elastic member. Has become.
[0005]
In such a capping device, the position at which the forming roll contacts the outer peripheral surface of the cap and the position at which screw forming is started may be deviated, so that the male screw portion at the mouth of the container and the female screw formed at the cap are screwed. The amount of screwing of the screw part with the part fluctuated, and the opening torque of the cap was not stable, and the appearance of the cap was easily deteriorated.
[0006]
For example, as the invention described in Patent Document 2, for the capping device, the torque of the motor that rotates the forming roll is electrically detected, and when the engagement start point is reached, along the periphery of the cap. There is known a configuration in which capping molding is completed by spinning a molding roll by a predetermined rotation angle.
[0007]
However, in the invention described in Patent Literature 2, although the screwing amount of the female screw portion of the cap is made constant after the screw is formed, the output torque of the capping device is constantly or directly monitored. If not, it is difficult to detect such an engagement start point, and if the forming head has a plurality of forming rolls, the torque fluctuates, and it is difficult to detect the engagement start point. The screw forming operation has to be performed independently for each forming head, and there is a problem that it is difficult to continuously manufacture at a high speed, which is not practical.
[0008]
In conventional screw forming, screw forming with a forming roll is performed by closing the forming roll (approaching the outer peripheral surface of the cap), pressing the outer peripheral surface of the cap into contact, and forming the male screw at the mouth of the container. This is performed by rolling the outer peripheral surface of the cap along the circumferential direction of the valley of the portion. Therefore, from the time when the forming roll starts to push the outer peripheral surface of the cap to the time when the forming roll substantially engages with the start end portion of the male screw portion, the forming roll simply rolls on the outer peripheral surface of the cap and plays idle rotation, so that the cap is rotated. Thread formation is not performed on the peripheral surface of, and the thread formation is started only when the position substantially engages with the start end of the external thread portion. As described above, the spin number of the forming roll is set to be larger than the number of turns of the screw (male screw portion) in consideration of the play until the start portion of the male screw portion is substantially engaged. For example, when the number of forming rolls is two, the screw is formed at the mouth of the container with 1.5 turns, and the number of spins of the forming roll is larger than the number of turns of the screw corresponding to the number of turns. If the number of turns is 2.0 or the number of turns of the screw is 2.0, the number of spins is set to 2.5. The number of spins of the forming roll refers to the number of times the forming roll turns around the cap from when the forming roll starts pressing on the outer peripheral surface of the cap to when the forming roll separates from the outer peripheral surface of the cap.
[0009]
[Patent Document 1]
JP-B-57-37518 (page 38, left column, line 38 to right column, line 12, FIG. 1 and FIG. 2)
[Patent Document 2]
JP-A-64-45288 (claims, page 3, upper left column, line 6 to lower left column, line 16)
[0010]
[Problems to be solved by the invention]
In the conventional roll-on type capping device, the relationship between the number of turns of the forming roll and the number of turns of the screw in contact with the outer peripheral surface of the cap will be further described. In general, the opening and closing of the forming roll is uniquely determined by the shape of the lower cam. Is decided. On the other hand, the direction of the container supplied to the capping device, that is, the position of the male screw portion at the mouth of the container is in a random state, and the screw is formed as it is. Therefore, the timing of screw forming may be early or sometimes late. Thus, despite the difference in the timing of screw forming, the spin number of the forming roll is uniquely determined according to the number of turns of the screw. As described above, the number of spins of the forming roll is set to a relatively large value so as to be applicable even when the timing of screw forming is late.
[0011]
However, as soon as the forming roll comes into contact with the outer peripheral surface of the cap, it is substantially engaged with the start end of the external thread portion at the mouth of the container, and at a time when there is no play such that screw forming is started. After the screw forming is completed, since the spin number is increased, the forming roll continues to roll on the outer peripheral surface of the cap, so that the flip-up roll scratch is formed to extend from the screw forming finished portion. Would. That is, a horizontal load (a load of 90N to 110N) is applied to the forming roll by a torsion spring, and the forming roll is disengaged from the male screw portion of the mouth of the container under such a horizontal load. When this is done, the forming roll is pulled up, so that a flip-up roll flaw is formed on the peripheral surface of the cap. When a flip-up roll wound that does not follow the male thread at the mouth of the container is formed at the end of the female thread of the cap, the roll wound hinders the opening of the cap and the opening torque is increased. It may be a hindrance when increasing or re-closing the cap, which may cause a quality problem such that the cap screw cannot be smoothly screwed into the male screw or the feeling of the end of the cap tightening is difficult to grasp. was there.
[0012]
The present invention has been made in view of the above technical problem, by defining the position of a male screw portion formed in the mouth of the container before screw forming of the cap, after the screw forming is completed, It is an object of the present invention to provide a capping device capable of preventing a flip-up wound from being generated in a cap and having an excellent effect of opening or re-opening the cap.
[0013]
Means for Solving the Problems and Their Functions
In order to achieve the above object, the invention of claim 1 is that, after a metal cap is put on the mouth of the container, a forming roll is brought into contact with the periphery of the cap and is formed in advance at the mouth of the container. In the capping device that forms a female screw portion on the cap by rolling along the circumferential direction of the male screw portion, the container is held at a position where screw forming by the forming roll is possible, and the container is rotated. A possible holding portion and a circumferential position of the external thread portion with respect to a fixed position where the forming roll abuts on the outer peripheral surface of the cap before the forming roll abuts on the outer peripheral surface of the cap. And a position setting means for rotating the container together with the holding portion so that the container is at a predetermined position.
[0014]
Therefore, according to the first aspect of the present invention, after the metal cap is placed over the mouth of the container, the forming roll is brought into contact with the periphery of the cap in the circumferential direction of the male screw portion formed in advance at the mouth of the container. By rolling along, a female screw portion is formed on the peripheral surface of the cap. In this case, before the forming roll comes into contact with the outer peripheral surface of the cap, the circumferential position of the external thread portion becomes a predetermined position with respect to a fixed position where the forming roll comes into contact with the outer peripheral surface of the cap. The container rotates. That is, the position in the circumferential direction of the male screw portion formed at the mouth of the container before the screw forming of the cap is defined. As a result, the number of spins can be set so that the forming roll is separated according to the end point of the screw forming, and it is possible to prevent the forming roll from continuing to roll on the outer peripheral surface of the cap.
[0015]
According to a second aspect of the present invention, in addition to the configuration of the first aspect, a mark is provided on a shoulder portion of the container so that the position setting means specifies a position of the male screw portion in a circumferential direction. It is characterized by including a rotation control means for controlling the container to rotate in the forward direction or in the reverse direction so that the position of the mark comes to the set reference position.
[0016]
Therefore, according to the second aspect of the present invention, in addition to the same effect as the first aspect of the present invention, a mark is provided on the shoulder of the container so as to specify the circumferential position of the external thread. The container is controlled to rotate in the forward direction or the reverse direction so that the position of the mark is at the set reference position. As a result, the direction of the container from the mark on the container shoulder, that is, the container is rotated in either the forward or reverse direction even when the cap is placed on the container, and the male screw portion at the mouth of the container is quickly rotated. Circumferential alignment can be performed.
[0017]
Further, in the invention according to claim 3, in addition to the configuration according to claim 1 or 2, the upper surface of the cap is pressed so as to be in contact with the mouth of the container to hold the cap against the mouth of the container, It is characterized by having a cap pressing part which rotates together with the container.
[0018]
Therefore, according to the third aspect of the present invention, in addition to the same effect as in the first or second aspect of the present invention, the upper surface of the cap is pressed so as to be in contact with the mouth of the container, so that the cap is pressed against the mouth of the container. Held and rotated with the container. In other words, since the rotation is performed to position the container while pressing the upper surface of the cap placed on the mouth of the container, in the case of an actual container filled with the contents of the container, the contents pop out from the mouth of the container. There is no worry of spilling and soiling the surroundings.
[0019]
According to a fourth aspect of the present invention, there is provided a molding table for placing a container on a fixed shaft and rotating and conveying the container in a horizontal direction; and a metal cap placed on the opening of the container so as to be able to ascend and descend above the molding table. In a capping apparatus having a forming head for performing a threading process on a cap and performing a hem-tightening process on a lower end portion of the cap, before the cap is transferred to the forming table side, a circle of the male screw portion is formed. Mark detecting means for detecting a mark provided on the container and outputting a signal indicating the mark on the container for specifying a position in the circumferential direction, and the male with respect to a fixed position where the forming roll first comes into contact with the outer peripheral surface of the cap. The container is moved in the forward direction based on an output signal of the mark detecting means, in a direction closer to a preset reference position of the mark so that the circumferential position of the screw portion has a predetermined positional relationship. Or an angle calculating means for calculating a turning angle for turning in one of the opposite directions, and based on a signal of the turning angle obtained by the angle calculating means after being passed to the forming table side. And a motor having a positioning function for rotating the container in a forward direction or a reverse direction.
[0020]
Therefore, according to the fourth aspect of the present invention, the container is placed on the forming table around the fixed shaft, the container is rotated and conveyed in the horizontal direction, and is disposed above the forming table so as to be able to move up and down. Before the cap is threaded and the bottom end of the cap is hem-tightened, that is, before being transferred to the molding table side, A mark provided on the container, which specifies the circumferential position of the male screw portion, is detected and its signal is output. Set the reference position of a predetermined mark so that the circumferential position of the male screw portion of the mouth of the container is in a predetermined positional relationship with respect to a fixed position where the forming roll first contacts the outer peripheral surface of the cap. After the rotation angle for rotating the container to the closer direction is calculated and transferred to the molding table side, the container rotates in the forward direction or the reverse direction based on the signal of the rotation angle.
[0021]
In other words, the angle difference between the position of the mark on the shoulder of the container and the reference position of the mark is calculated, and the container is rotated forward or backward from the position of the mark based on the signal of the angle difference. Is done. In this case, the step of detecting the mark provided on the shoulder of the container and the step of rotating the container are not performed on the same molding table side, but are dispersed as independent steps, and the container is placed on the molding table side. The mark is detected before being delivered, and based on the signal of the angular difference between the position of the mark detected after the container is delivered to the molding table and the reference position of the mark, the container is marked. Is rotated forward or backward from the position. As a result, on the molding table side, only the positioning of the container is performed based on the detection signal, so that it is not necessary to rotate the container to detect the mark on the shoulder of the container, and the positioning control of the container is performed. Can be simplified and the speed of the apparatus can be increased.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the present invention will be described based on specific examples. First, a drive mechanism including a capping device as an object of the present invention will be described. The capping device is provided with a screwless cap which covers the mouth of a threaded container shown in FIGS. It is a roll-on type capping device that performs forming such as thread cutting and hem tightening. Here, the threading process is a process of plastically deforming the peripheral surface of the cap into a screw shape in accordance with the thread formed in the container mouth, instead of cutting the cap.
[0023]
FIG. 1 schematically shows an example of a capper 7F of a capping device 100. The capper 7F has a molding table 3 on which containers 1 covered with caps 2 are placed at regular intervals, and a cylindrical shaft for supporting the molding table 3. The fixed shaft 3a is rotatably held by a vertically mounted fixed shaft 4, and the fixed shaft 4 includes an inner fixed shaft 4a and an outer fixed shaft 4b that can move up and down. A plurality of sets of body guides 5 and neck guides 6 for holding the body of the container 1 are provided on the upper surface of the molding table 3 in accordance with the pitch of the mounting portion of the container 1.
[0024]
A frame turret 7 that rotates integrally with the molding table 3 about the fixed shaft 4 is provided above 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. As shown in FIGS. 1 and 4, a capper 7 </ b> F provided with a plurality of forming heads 12 has an inlet turret 7 </ b> D for supplying the container 1 to the inlet side (turret IN) of the forming table 3, An outlet turret 7 </ b> E for transporting the container 1 discharged from the outlet side (turret OUT) to the next process is provided to constitute the capping device 100.
[0025]
As shown in FIGS. 1 and 3, the spindle unit 8 is vertically moved with respect to the container 1 and is rotatably driven. A hollow shaft 8a is fixed inside the hollow shaft 8a and has a predetermined lower end. A pressure rod 8c having a hole 8b having a depth of 8 mm, a pressure block 9 which is arranged on the outer peripheral side of the pressure rod 8c and has a shape at its lower end for deforming the corner 2a of the cap 2 and a hole 8b The spring 8d, which is inserted and has a predetermined elastic force, is disposed inside the hole 8b and the pressure block 9 and is urged downward by the spring 8d, and is pressed against the upper surface (upper plane) of the cap 2. A rod-shaped pressing member (push pin) 10 that can be moved up and down and rotatable in a state where it is located, and a cone cam 11a that is disposed on the outer peripheral side of the hollow shaft 8a and is provided at the lower end. And a sleeve 11.
[0026]
FIG. 3 is an enlarged view showing a lower portion of the spindle unit 8. The pressing member 10 has a head 10 c at the lower end, and receives a predetermined elastic force from a spring 8 d at the center of the shaft. An outer edge 10a is provided. A bush 10b is provided between the lower peripheral surface of the outer edge portion 10a and the inner surface of the pressure block 9 to hold the pressing member 10 vertically and rotatably. Inside the pressure block 9, a pressure pad 8g for accommodating the head 10c of the pressing member 10 in contact with the upper surface of the cap 2, a spring 8e for urging the pressure pad 8g downward, and the pressure pad 8g are integrated. And a pin 8f that moves up and down between the hole of the pressure block 9 and the peripheral edge thereof.
[0027]
In addition, since the pressing member 10 abuts on the upper surface of the cap 2 placed on the container opening 1b, the pressing member 10 not only prevents the cap 2 from being obliquely covered on the container opening 1b, but also the container 1 body (container opening 1b). It is also used to prevent slip (rotation between the container 1 and a container mounting table 43 described later) when rotating the. The head 10c of the pressing member 10, which is rotatable and urged downward by the spring 8d, preferably has a disk shape so as not to damage the upper surface of the cap 2. Further, when the container 1 without the cap 2 is supplied, the pressing portion 10 is not raised, and the forming roll 13 and the lock roll 14 are not closed (in order to prevent the container opening 1b from being damaged). ), The head 10c of the pressing member 10 has a smaller cross-sectional dimension than the inner diameter of the container mouth 1b.
[0028]
Further, a forming head 12 which rotates together with the hollow shaft 8a and moves up and down is attached to the lower end of the spindle unit 8. In the drive mechanism shown in FIG. 1, the cam on the forming table 3 side (lower side) is called a lower cam, and the cam on the opposite side (upper side) toward the forming table 3 is called an upper cam.
[0029]
The forming head 12 has a conventionally known structure, and includes two or three forming rolls 13 for threading the cap 2 and a pill fur proof band provided at a lower end of the cap 2. And two or three lock rolls 14 for performing a skirt tightening process. These rolls 13 and 14 are respectively held by torsion springs 16 having a predetermined elastic force so as to move back and forth in the radial direction toward the center axis of the forming head 12, and the back and forth movement is controlled by the cone cam 11 a and the cone cam 11 a. The cam follower 15 and the torsion spring 16 are in contact with each other.
[0030]
Here, a cam that moves the spindle unit 8 up and down and moves the cone cam 11a up and down will be described. In the frame turret 7, the lower disk portion 7C and the intermediate disk portion 7B are located between the lower disk portion 7C and the intermediate disk portion 7B. A frame 17 extending outward from the fixed shaft 4 in the radial direction is provided. Two cam grooves 18A and 18B are formed in the upper and lower two places on the outer peripheral surface of the frame 17 along the circumferential direction.
[0031]
In FIG. 1, a cam follower 19A engaged with a cam groove 18A of the upper cam is connected to a cylindrical member 9A rotatably holding the hollow shaft 8a. A cam follower 19B engaged with the cam groove 18B of the lower cam in FIG. 1 is connected to the sleeve 11 integrated with the cone cam 11a.
[0032]
Therefore, when the spindle unit 8 revolves around the fixed shaft 4, the respective cam followers 19A and 19B run along the cam grooves 18A and 18B. As a result, the cam follower 19A moves up and down according to the shape of the cam groove 18A, so that the spindle unit 8 and the forming head 12 move up and down, and the cam follower 19B moves up and down according to the shape of the cam groove 18B. The operation by these cams will be described later.
[0033]
Next, a mechanism for rotating the forming head 12 via the spindle unit 8 will be described. In the example shown in FIG. 1, a single power source (not shown) is configured to perform all operations to simplify the configuration of the entire apparatus, and the frame turret 7 rotates together with the forming table 3. As a result, the hollow shaft 8a and the molding head 12 attached thereto are rotated. Specifically, a sun gear 20 is fixed to the upper portion of the fixed shaft 4 slightly below the upper disk portion 7A. The planetary gear 21 meshing with the sun gear 20 is rotatably held by the upper disk portion 7A of the frame turret 7.
[0034]
At a position adjacent to the planetary gear 21, a first rotary shaft 22 penetrating the upper disk portion 7 </ b> A is provided, and a lower end of the rotary shaft 22 has an intermediate portion meshing with the planetary gear 21. A drive timing pulley 24 is attached to an end to which the gear 23 is attached and which protrudes above the disk portion 7A. Further, at a position close to each spindle unit 8 on the outer peripheral portion of the upper disk portion 7A, an end is rotatably held by an intermediate disk portion 7B through the upper disk portion 7A. Two rotation shafts 25 are provided. A driven timing pulley 26 paired with the drive timing pulley 24 is attached to an end of the second rotary shaft 25 protruding above the upper disk portion 7A. A driven gear 27 is attached to an intermediate portion of the second rotary shaft 25, that is, a portion located between the upper disk portion 7A and the intermediate disk portion 7B. The driven gear 27 meshes with an elongated gear 28 provided on the outer peripheral portion of the hollow shaft 8a.
[0035]
As shown in FIG. 1, a timing belt 29 is wound around a predetermined one drive timing pulley 24 and two driven timing pulleys 26 adjacent to each other. Further, a belt tensioner (not shown) for pressing the slack side portion of the timing belt 29 toward the center of the traveling path of the timing belt 29 is provided, and the extra length of the timing belt 29 is provided.
[0036]
In this embodiment, as shown in FIG. 2, an alignment mark (hereinafter, simply referred to as a mark) 41 applied to the container shoulder 1a before being transferred to the container mounting table 43 on the molding table 3 side is detected. A detection camera 42, a disk-shaped container mounting table 43 provided in a peripheral portion (recess) 3 b of the molding table 3 and rotatably holding the container 1, and a detection camera 42 connected to the detection camera 42 An angle calculating circuit 44 for transmitting an instruction signal for rotating the container mounting table (container) 43 based on the output signal of the above, and moving the container mounting table 43 forward or backward based on the signal from the angle calculating circuit 44. And a servo motor (motor with a positioning function) 45 for rotating the motor. The angle calculation circuit 44 is connected to a servo controller 47 via a slip ring 46. The servo controller 47 controls the servo motor 45 based on the instruction signal transmitted from the angle calculation circuit 44. That is, the servo controller 47 outputs an instruction signal to the servomotor 45 to rotate and stop the rotating shaft 53 of the servomotor 45.
[0037]
The molding table 3 is provided with a through hole 48c through which the hollow shaft 48 penetrates. The container mounting table 43 is connected to the tip of the hollow shaft 48 by a spline. Further, a suction mechanism 49 (rotor seal) is provided at the other end of the hollow shaft 48, and a driven gear 50 is fastened by a key above the suction mechanism 49. The suction mechanism 49 is connected to a vacuum source (not shown) via the apparatus main body.
[0038]
A pocket 55 is formed on the outer periphery of the inlet turret 7D, and a suction hole 56 for sucking and holding the body of the container 1 is formed in the pocket 55, and is connected to a vacuum source (not shown).
[0039]
Further, since the driven gear 50 rotates while being engaged with the rotating gear 54 fixed to the rotating shaft 53 by the rotation of the servomotor 45, torque is transmitted to the driven gear 50 and the hollow shaft 48 and the container mounting member are rotated. It rotates integrally with the table 43.
[0040]
FIGS. 5 and 6 are views showing that the mark 41 is provided on the container shoulder 1a with coloring ink or ink containing a fluorescent agent. In order to form the mark 41 on the container shoulder 1a, an inkjet head is provided in an outer tool fixed to the outside of the container opening 1b in a molding step of forming a male screw portion on the container opening 1b in a line for manufacturing the container 1. (Not shown), fluorescent ink and UV ink are ejected from the inkjet head in accordance with the start or end of the cutting of the external thread portion of the container opening 1b to form a mark on the container shoulder 1a. It is preferred to apply. The mark 41 formed by the ink jet head is formed at the time of forming (working) the external thread of the container opening 1b. In this embodiment, since the detection camera 42 can detect the mark 41 from above by marking the mark 41 on the container shoulder 1a, it is not necessary to rotate the container 1 each time to search for the position of the mark 41.
[0041]
According to the above configuration, since the timing belt 29 and each of the timing pulleys 24 and 26 are arranged above the upper disk portion 7A, they can be easily replaced. The belt length accompanying the change in the number of teeth 24, 26 can be adjusted by a belt tensioner (not shown). That is, these mechanisms change the number of teeth by exchanging one or both of the timing pulleys 24 and 26 to thereby change the rotation ratio between the drive timing pulley 24 and the driven timing pulley 26, that is, the planetary gear 21 and the spindle unit. The number of spins of the molding head 12 can be adjusted by changing the rotation ratio with respect to the rotation speed of the molding head 12.
[0042]
Next, the operation of the above-described capping device 100 will be described. When the container 1 with the cap 2 covered on the container opening 1b is transferred from the inlet turret 7D to the container mounting table 43 on the capper 7F side, the container 1 is held upright by the body guide 5 and the neck guide 6 described above. At the same time, the bottom of the container 1 is sucked and held by the suction mechanism 49. At that time, the forming head 12 has been raised to the upper limit position, and the pressing member 10 is rotatably held with its tip directed downward by the elastic force of the spring 8d. This state is shown in FIG. In the cam diagram of FIG. 11, the state is (1).
[0043]
Next, the upper surface of the cap 2 covering the container opening 1 b on the neck guide 6 is pressed by the pressing member 10 incorporated in the molding head 12, and the container 1 is sandwiched between the container mounting table 43 and the pressing member 10. 6 in the forward direction (clockwise) so that the circumferential position of the start end portion (hereinafter referred to as the start end portion) 1c of the external thread portion of the container mouth 1b shown in FIG. The container 1 is rotated in the opposite direction (counterclockwise). The angle calculation circuit 44 outputs a rotation signal to the servo controller 47 via the slip ring 46 so as to rotate the container 1 in the forward direction or the reverse direction, whichever is closer. Drive. At this time, it is necessary that the pressure block 9 (which does not rotate) that presses and deforms the corner 2 a of the cap 2 does not contact the cap 2.
[0044]
Specifically, before the container 1 is transferred from the inlet turret 7D side to the container mounting table 43 on the capper 7F side, the detection camera 42 detects the mark 41 applied to the container shoulder 1a. Here, the angle calculation circuit 44 calculates an angle difference (rotation angle) between the preset reference position of the mark 41 and the mark 41 provided on the container shoulder 1a, and the rotation angle is 180 degrees. The rotation of the container mounting table 43 (container 1) is controlled by the servomotor 45 in the forward direction or the reverse direction, in which the rotation angle is smaller, depending on whether or not the rotation angle is larger.
[0045]
As described above, by calculating the rotation angle θ2 by the angle calculation circuit 44, the container mounting table 43 can be rotated in either the forward direction or the reverse direction. Next, when the rotation shaft 53 of the servo motor 45 rotates in response to the instruction signal of the servo controller 47, the rotation gear 54 rotates together with the rotation shaft 53. When the driven gear 50 meshing with the rotating gear 54 rotates, the container mounting table 43 rotates together with the driven gear 50 via the hollow shaft 48. This state is shown in FIG. In the cam diagram of FIG. 11, the state is (2).
[0046]
Subsequently, as described above, after the direction of the container 1, that is, the position of the male screw start end 1 c in the circumferential direction is aligned, the pressure block 9 is brought into contact with the corner 2 a of the cap 2 to be pressed and deformed. This state is shown in FIG. Also, in the cam diagram of FIG. 11, the state is (3).
[0047]
In the case of the step (2) in which the container 1 is rotated while the upper surface of the cap 2 is pressed by the pressing member 10, the upper cam is moved from the state (1) to the bottom dead center at one time. Instead, it is necessary to lower the forming head 12 stepwise from the state (2) to the state (3) in order to rotate the container 1.
[0048]
However, when the container 1 is securely sucked and held, the container 1 can be rotated even in the state (1) where the upper surface of the cap 2 is not pressed by the pressing member 10, so that the upper cam is lowered. It is not necessary to stop temporarily.
[0049]
Next, the cone cam 11a descends according to the cam groove 18B of the lower cam, and the forming roll 13 spins around the cap 2 to form a female screw portion on the cap 2. In this step, the position where the forming roll 13 abuts on the outer peripheral surface of the cap 2 is such that the press pin angle is in the range of 50 degrees or less, preferably 5 degrees or more and less than 20 degrees toward the front of the male screw start end 1c. It is set as follows. In consideration of errors in the circumferential position of the male screw portion of the container mouth in the circumferential direction and errors in mechanical and electrical responses such as slippage, if the press pin angle is less than 5 degrees, screw molding may be defective. If the press pin angle is 50 degrees or more, a flip-up roll scratch that affects opening is likely to occur. Therefore, it is most preferable that the abutting position of the forming roll 13 is set to a press pin angle of 5 to 20 degrees ahead of the male screw start end 1c. This state is shown in FIG. In the cam diagram of FIG. 11, the state is (4).
[0050]
Then, by setting the contact point of the forming roll 13, the position where the forming roll 13 is separated from the position of the male screw terminal end 1 d in the circumferential direction of the container opening 1 b is determined. Therefore, by setting this contact point, the escape position of the forming roll 13 with respect to the external thread end portion 1d of the container mouth 1b can be specified in the circumferential direction, and a flip-up roll scratch on the screw end portion of the cap 2 can be specified. Is reliably prevented from occurring.
[0051]
Next, a process of performing the thread cutting process and performing the hem tightening process on the lower end portion of the cap 2 will be described below.
[0052]
First, as shown in FIG. 1, when the frame turret 7 rotates around the fixed shaft 4, the planetary gear 21 rolls while meshing with the sun gear 20, so that the planetary gear 21 rotates. Therefore, the hollow shaft 8 a rotates via the planetary gear 21 and the intermediate gear 23, the timing pulleys 24 and 26, the timing belt 29, the driven gear 27, and the elongated gear 28. As a result, the forming head 12 rotates together with the hollow shaft 8a.
[0053]
Next, when the frame turret 7 rotates further, the cam follower 19B of the lower cam further descends the cone cam 11a according to the shape of the cam groove 18B. As a result, the cam follower 15 which is in contact with the cone cam 11a is displaced toward the center of the cap 2, so that the rolls 13 and 14 move in a direction approaching the cap 2 in conjunction therewith.
[0054]
Next, the forming roll 13 turns around while being pressed against the outer peripheral surface of the cap 2. Therefore, in the portion where the thread (male thread) is formed in the container mouth 1b, the peripheral surface of the cap 2 is deformed along the thread to perform so-called thread cutting. Further, the lock roll 14 performs a skirt tightening process in which the lower end of the cap 2, that is, the lower end of the pill-proof band is pressed toward the center of the cap 2 to be deformed.
[0055]
In this state, since the frame turret 7 rotates about the fixed shaft 4, a threading process is performed on the peripheral surface of the cap 2, and a hem tightening process is performed on the entire periphery of the cap 2 at the lower end portion of the pill faproof band. In the process, the forming roll 13 spirally turns down along the screw thread formed in the container mouth 1b, and as a result, a female screw portion is formed in the cap 2. The number of spins for threading by the forming roll 13 is determined by the rotation ratio (speed change ratio) between the planetary gear 21 and the elongated gear 28 of the spindle unit 8, but in the configuration shown in FIG. Since the rotation ratio can be appropriately set, the number of spins can be changed so as to reduce the turning angle for extra spin with respect to the number of turns of the male screw of the container mouth 1b. The state in which the forming roll 13 is in contact with the outer peripheral surface of the cap 2 where there is no thread of the male thread portion 1b can be reduced as much as possible. As a result, it is possible to prevent the occurrence of a roll-like roll scratch and to avoid a situation such as increasing the torque required for opening the cap 2. In other words, if a roll flaw is formed along the circumferential direction where there is no screw thread from the external thread end portion 1d of the container mouth 1b, this may cause an increase in the opening torque of the cap 2, but In this embodiment, it is possible to prevent the occurrence of such a flip-like roll scratch that deteriorates the opening property, so that the opening property is improved, and the screwing of the cap 2 is smoothly performed when re-opening. And the feeling of the completion of the tightening of the cap 2 can be reliably obtained.
[0056]
Next, when the frame turret 7 further rotates from this state, the cam follower 19B of the lower cam in FIG. 1 moves upward according to the shape of the cam groove 18B, and as a result, the cone cam 11a is pulled up. 13 and 14 are moved in a direction away from the cap 2.
[0057]
Next, the cam followers 19A and 19B move upward according to the shape of the cam grooves 18A and 18B. As a result, the entire forming head 12 is pulled up above the container 1 and a series of processes is performed when the top dead center is reached. Ends. Then, the container 1 after the capping is discharged from the molding table 3 via the outlet turret 7E and sent to the next step such as inspection and packing.
[0058]
Next, a method of setting (positioning) the forming roll 13 will be described below.
[0059]
First, the setting operation (step) of the forming roll 13 is performed at a position where the work is easy to perform. For example, the setting operation is performed in the above-mentioned state (3), that is, at a position at a rotation angle of 170 degrees at which the forming roll starts to shift. The molding head 12 is stopped at that position. Therefore, the fastener (fixing means) 26a for fixing the rotating shaft 25 and the driven timing pulley 26 shown in FIG. 1 is loosened. When the fasteners 26a are loosened, the forming head 12 becomes rotatable. Therefore, a forming roll incorporated in the forming head 12 (a specific forming roll when a plurality of forming rolls 13 are provided with a difference in pressing force) 13 The molding head 12 is rotated so that is positioned at the reference mark K. In a simplified manner, a setting jig (not shown) is attached to the neck guide 6 to set the forming roll 13 at a predetermined position. Thereafter, the fastener 26a is tightened to fix the driven timing pulley 26 to the rotating shaft 25. In this way, the positioning of the forming roll 13 is similarly performed in each forming head 12.
[0060]
When the forming head 12 is provided with a plurality of forming rolls 13, the torsion spring of the forming roll 13 is adapted to the shape (parallel screw, tapered screw, etc.) of the male screw formed in the container opening 1b. The cap 2 can be threaded by adding strength to the elastic force of the cap 16.
[0061]
For example, when the forming head 12 is provided with two forming rolls 13, the first forming roll (1ST roll) 13 is applied to the cap 2 at a press pin angle of 10 degrees with respect to the male screw start end 1c. Upon contact, the second roll (2ND roll) 13 on the opposite side of the position starts to contact the cap 2 at the position on the opposite side. Then, the second forming roll 13 rolls so as to trace the valley of the female screw portion of the cap 2 on which the screw forming has been performed by the first forming roll 13 with a half circumference delay as compared with the first forming roll 13. The forming of the female screw is performed twice. When the first forming roll 13 reaches the screw end portion and is released as a final stage, the second forming roll is also released from the outer peripheral surface of the cap 2 at the same timing, so that a part of the female screw portion of the cap 2 is formed. With regard to the above, only the first forming roll 13 is screw-formed once, and the screw forming by the second forming roll 13 is not performed, and the screw forming is completed.
[0062]
Therefore, by setting the elastic force of the torsion spring 16 of the first forming roll 13 to be slightly stronger or weaker than that of the torsion spring 16 of the second forming roll 13 in accordance with the shape of the screw, the female screw portion of the cap 2 can be formed. The shape can be stabilized.
[0063]
In this case, it is preferable that the first forming roll 13 and the second forming roll 13 can be identified in advance, and the specific forming roll 13 is rotated so as to be at the position of the reference mark K. , Perform alignment.
[0064]
As shown in FIG. 4, the forming heads 12 are arranged at equal intervals on the outer peripheral position of the capper 7F. Here, if the orientations of the forming rolls 13 incorporated in the respective forming heads 12 are aligned and set so that they are all in the same direction, the number of spins of the forming rolls 13 can be multiplied by an integer within the capping range (60 degrees in the figure). When performing screw forming, the position where the forming roll 13 abuts on the cap 2 is constant regardless of the number of revolutions of the capper 7F.
[0065]
However, when the screw forming is performed with a fractional number of turns such as 2.2 times or 2.3 times, the direction of the forming roll 13 is shifted from the initial set position while the capper 7F rotates one revolution. As a result, a problem arises in that the positioning with the start end portion 1c of the external thread takes place.
[0066]
Therefore, the apparatus shown in FIGS. 15 to 17 includes an angle calculation circuit having an angle position adjustment function for angle correction so as to be able to cope with screw forming when the spin number has a fraction other than an integer. 44a are provided. The angle calculation circuit 44a has a function of correcting the rotation angle based on the shift angle θ1 of the forming roll 13 when the capper 7F makes one revolution. An example of a mechanism including the angle calculation circuit 44a will be described below.
[0067]
The angle calculation circuit 44a has a mark detection device 51 and a rotation angle calculation device 52. The mark detection device 51 is connected to a detection camera 42 and a rotation angle calculation device 52, and is connected to a servo controller 47 via a slip ring 46. Note that the mark angle information J2 is input to the rotation angle calculation device 52, and the rotation angle θ2 is calculated.
[0068]
FIGS. 16 and 17 are views showing a part of a drive system in the forming head 12. At least one of the forming heads 12 in the capper 7 </ b> F has at least one of the forming heads 12 (hereinafter, referred to as an angle detector). , A specific head). The arrow Z shown in FIG. 17 indicates the revolving direction of the spindle unit 8. This drive system rotates in such a manner that the ratio of the number of rotations with respect to the spindle unit 8 (the elongated gear 28) becomes 1 to 1 as shown in FIG. 16 in addition to the drive mechanism of the capping device 100 shown in FIG. It has a driven shaft 101 and an angle detector 102 for detecting a rotation angle of the driven shaft 101.
[0069]
The shaft 103 of the angle detector 102 is provided with a joint 104 connected to the driven shaft 101. A fixing base 105 for fixing the angle detector 102 is provided on the disk portion 7A. The fixed base 105 is provided perpendicular to the disk portion 7A along the axial direction of the driven shaft 101. Further, the fixing base 105 is fixed to the upper surface of the disk portion 7A with a bolt so as to be cantilevered.
[0070]
As shown in FIGS. 1 and 17, first, when the planetary gear 21 meshing with the sun gear 20 revolves in the clockwise direction (the direction indicated by the arrow Z) while rotating, the intermediate gear 23 meshes with the planetary gear 21. As a result, the drive timing pulley 24 rotates counterclockwise. Next, since the timing belt 29 is wound around each of the timing pulleys 24 and 26, the rotation of the drive timing pulley 24 also causes the driven timing pulley 26 to rotate counterclockwise. Next, since the driven gear 27 is rotated by the rotation of the driven timing pulley 26, the elongated gear 28 meshing with the driven gear 27 rotates clockwise. When the driven gear 27 rotates, the shaft 103 of the angle detector 102 rotates clockwise via the coupling gear 106 and the joint 104.
[0071]
In this embodiment, an angle calculation circuit 44a is used to correct the shift angle θ1 of the forming roll 13 when the capper 7F makes one revolution, and the angle calculation circuit 44a causes the molding to shift when the capper 7F makes one revolution. Based on the shift angle θ1 of the roll 13, control was performed to correct the amount of rotation of each container 1 so that the position where the forming roll 13 hits the cap 2 always becomes a specific position. FIGS. 12 and 13 show examples of the control. FIG. 12 shows the initial setting. The routine shown in the flowchart of FIG. 13 is based on the timing signal M generated when each molding head 12 passes the reference position L. Is repeatedly executed.
[0072]
4 and 12, at the time of initial setting, all the forming heads 12 in the capper 7F are aligned with the forming rolls 13 (any position is acceptable, but in this embodiment, the rotational angle is 170 degrees). Until the forming roll 13 is aligned with the reference mark K (step S1). FIG. 14 shows the alignment position of the forming roll 13 with respect to the reference mark K.
[0073]
That is, in step S1, all of the cappers 7F are positioned at a rotation angle of 170 degrees such that the center of the forming roll (two forming rolls in FIG. 14) 13 is located between the center of the capper 7F and the reference mark K. Of the molding head 12 is performed. The forming head 12 is provided with two lock rolls 14 in addition to the two forming rolls 13.
[0074]
After the positions of all the molding heads 12 are set in step S1, the frame turret 7 is rotated to a reference position L (a position at a rotation angle of 0 degree), and the rotation angle of the angle detector 102 of the specific head is set to 0 degree. (Step S2). Then, the frame turret 7 is revolved by one revolution, and the detection value (rotation angle) of the angle detector 102 of the specific head is read as the deviation angle θ1 at the reference position L of the frame turret 7, initialized, and terminated (step S3). .
[0075]
FIG. 13 is a flowchart showing control during operation (during operation) of the apparatus. FIG. 15 is a view showing an apparatus provided with the angle detector 102. First, a reference position timing signal M of the frame turret 7 is input. After that, it is determined whether or not the head is a specific head (step S11). If it is determined to be affirmative in step S11, it is determined whether or not the specific head is the first rotation after the initial setting (step S12).
[0076]
If it is determined to be affirmative in step S12, the detected value of the angle detector 102 of the specific head is set as the shift angle θ1 in one revolution at the reference position L of the frame turret 7, as shown in FIG. Is output (step S13). On the other hand, mark angle information J2 is output from the mark detection device 51 based on the detection signal of the mark 41 detected from the detection camera.
[0077]
Accordingly, the rotation angle θ4 is calculated (calculated) based on each of the above-mentioned deviation angle information J1 and mark angle information J2, and the container 1 is moved so that the position where the forming roll 13 hits the cap 2 always becomes a specific position. A rotation command (output signal) J3 for rotating at the rotation angle θ4 is output to the servo controller 47 via the slip ring 46 (step S14).
[0078]
Next, based on the rotation command J3 output in step S14, the servo motor 45 corresponding to each molding head 12 is rotated to rotate each container 1 on the container mounting table 43 (step S15).
[0079]
If a negative determination is made in step S12, the value of the angle detector 102 at that time is read, the value is output to the rotation angle calculation device 52 as the deviation angle information J1, and the previous deviation angle θ1 is updated. (Step S16), and thereafter, the process proceeds to Steps S14 and S15, returns to the start, and is repeated.
[0080]
Therefore, if it is determined in step S11 that there is a molding head 12 following the specific head, a rotation angle θ4 is calculated in step S14, and in step S15, each molding head 12 is calculated based on the rotation command J3. Is rotated in the same manner as described above, and the container 1 on the container mounting table 43 is rotated.
[0081]
After all, by performing the control of the above-described steps S1 to S16, the angle detector 102 detects the deviation angle θ1 of the position when the specific head makes one revolution, and after the initial setting is completed, the apparatus is operated by each control. In addition, while the specific head is making one revolution, the misalignment angle θ1 is assigned to each forming head 12 and the correction is performed. The position can be defined precisely.
[0082]
Note that it is possible to perform both the detection step of detecting the mark 41 on the molding table 3 side and the rotating step of rotating the container 1, but the molding head 12 exists above the container 1. Therefore, it is necessary to rotate the container 1 in order to detect the mark 41 from the side of the container 1 (the container body, the container shoulder 1a). Therefore, in this embodiment, the two-step dispersing process is performed so that the rotation control for rotating the container 1 and the detecting means for detecting the mark 41 need not be provided for each molding head 12. Was. Thereby, the circuit can be simplified. This process can be applied to the case where the mark 41 is applied to the body of the container 1, but it is preferable to apply the mark 41 to the container shoulder 1a for simplifying the circuit for the above-described reason. .
[0083]
Here, the relationship between the above specific example and any one of the first to fourth aspects of the present invention will be briefly described. The above-described container mounting table 43 corresponds to the holding part in the first aspect of the present invention. A rotation control mechanism for rotating the container mounting table 43 based on an output signal from the storage device corresponds to the position setting means in the first aspect of the present invention, and the servo controller 47 controls the rotation in the second aspect of the present invention. The spring 8d and the pressing member 10 correspond to the cap pressing portion according to the third aspect of the invention, the detection camera 42 corresponds to the mark detection means according to the fourth aspect of the present invention, and furthermore, the angle calculating means. The circuits 44 and 44a correspond to the angle calculating means in the fourth aspect of the present invention, and the servo motor 45 corresponds to the motor with the positioning function in the fourth aspect of the present invention. To. Further, the shape of the container may be any shape in which a male screw portion is formed at the container mouth, and a container having a bottom lid attached to the lower end of the container body, or a container body and the container bottom. May be an integrally molded container or a cylindrical container having an open bottom.
[0084]
Further, as the motor with a positioning function, a stepping motor can be used in addition to the servomotor.
[0085]
Furthermore, in this embodiment, the mark given to the container shoulder is detected. However, the present invention is not limited to this. For example, the outer surface of the container is photographed by a plurality of cameras, and the image is subjected to the synthesis processing and horizontal development. If the configuration is such that the rotation angle can be calculated by detecting the position of the male screw start end or the male screw end, the mark given to the body of the container or the position of the male screw at the container mouth It is also possible to use patterns, characters, barcodes, etc. printed on the outer surface of the container in a specific relationship with the container, and before the cap is put on the container mouth, directly detect the male screw part of the container mouth. Alternatively, the male screw portion of the container mouth may be aligned in the circumferential direction.
[0086]
Further, in this embodiment, the position is adjusted so that the position of the male screw start end is a predetermined position. However, if the position in the circumferential direction of the male screw part of the container mouth is specified, It is also possible to perform circumferential alignment at the position of the male screw terminal.
[0087]
【The invention's effect】
As described above, according to the first aspect of the present invention, the container is held at the position where the screw can be formed by the forming roll by the holding portion and rotated, so that the cap is formed at the container opening before the screw is formed. The position in the circumferential direction of the provided male screw portion can be accurately defined. Therefore, it is possible to reliably adjust the timing of releasing the forming roll in accordance with the end point of the screw forming (the end portion of the screw of the cap), and to prevent the occurrence of a roll-like wound on the end portion of the screw of the cap. Thus, it is possible to provide an excellent effect in opening or re-opening the cap.
[0088]
According to the second aspect of the present invention, in addition to the effect of the first aspect, the container in which the shoulder portion is marked so as to specify the circumferential position of the external thread portion is provided. Since the mark is controlled to rotate in the forward direction or the opposite direction so that the position of the mark comes to the set reference position, the direction of the container from the mark provided on the shoulder of the container, that is, even if the container is covered with the cap, The position of the male screw in the mouth in the circumferential direction can be easily detected without rotating the container, and the container can be rotated in either the forward or reverse direction where the rotation angle is small. And the container can be positioned quickly.
[0089]
According to the third aspect of the present invention, in addition to the effect of the first or second aspect, since rotation is performed for positioning the container while pressing the upper surface of the cap covering the mouth of the container. In the case of an actual container filled with the contents of the container, it is possible to prevent the contents from jumping out and spilling out of the mouth of the container.
[0090]
According to the fourth aspect of the present invention, the step of detecting the mark on the shoulder of the container and the step of rotating the container can be performed separately. Therefore, it is not necessary to detect the mark on the molding table side, and the detection signal can be easily processed. As a result, the circumferential direction of the external thread portion formed on the container mouth portion before the threading of the cap is formed. The position can be defined quickly and accurately.
[Brief description of the drawings]
FIG. 1 is a schematic vertical sectional view showing an example of a capping device according to the present invention.
FIG. 2 is a schematic configuration diagram showing a capping device according to the present invention.
FIG. 3 is an enlarged view showing a lower portion of the spindle unit shown in FIG. 1;
FIG. 4 is a schematic plan view showing a driving mechanism including the device shown in FIG.
FIG. 5 is a top view showing a mark provided on a container shoulder.
FIG. 6 is a side view showing a mark provided on a container shoulder.
FIG. 7 is an explanatory view showing an initial setting step of the container.
FIG. 8 is an explanatory view showing a rotating step of the container.
FIG. 9 is an explanatory view showing a step of pressing and deforming a corner portion of the cap.
FIG. 10 is an explanatory view showing the steps of screw forming and hem tightening.
FIG. 11 is a cam diagram of cams (an upper cam and a lower cam).
FIG. 12 is a flowchart illustrating an example of control of the capping device according to the present invention.
FIG. 13 is a flowchart showing control subsequent to the flowchart shown in FIG. 12;
FIG. 14 is a schematic top view illustrating a fiducial mark shown in FIG. 4;
FIG. 15 is a schematic configuration diagram showing another example of the capping device according to the present invention.
16 is a schematic longitudinal sectional view showing a driven mechanism including an angle detector of the device shown in FIG.
FIG. 17 is a schematic top view showing a driven mechanism including an angle detector of the device shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Container, 1b ... Container mouth part, 2 ... Cap, 3 ... Molding table, 13 ... Molding roll, 43 ... Container mounting table, 48 ... Hollow shaft, 50 ... Driven gear.

Claims (4)

After a metal cap is placed over the mouth of the container, the forming roll is brought into contact with the cap and rolled along the circumferential direction of the externally threaded portion formed at the mouth of the container. In a capping device for forming a female screw portion on the cap,
Holding the container at a position where screw forming by the forming roll is possible, and a rotatable holding unit,
Before the forming roll comes into contact with the outer peripheral surface of the cap, the circumferential position of the male screw portion is a predetermined position with respect to a fixed position where the forming roll comes into contact with the outer peripheral surface of the cap. And a position setting means for rotating the container together with the holding portion. The position setting means moves the container with a mark on the shoulder of the container in the forward direction so as to specify the circumferential position of the external thread portion so that the position of the mark comes to a set reference position. 2. The capping device according to claim 1, further comprising a rotation control means for controlling the rotation in the reverse direction. A cap pressing portion which presses an upper surface of the cap so as to be in contact with a mouth portion of the container to hold the cap against the mouth portion of the container and rotates with the container. Item 3. The capping device according to item 1 or 2. A forming table for placing the container around a fixed shaft and rotating and transporting the container in the horizontal direction; and a threading process for the cap, which is disposed above the forming table so as to be able to ascend and descend, and has a metal cap over the opening of the container. And a forming head that performs a hem-tightening process on the lower end of the cap.
Before being transferred to the molding table side, the position of the male screw portion in the circumferential direction is specified, a mark detection unit that detects a mark applied to the container and outputs a signal thereof,
One closer to a predetermined reference position of the mark so that the circumferential position of the male screw portion has a predetermined positional relationship with respect to a fixed position where the forming roll first contacts the outer peripheral surface of the cap. Angle calculation means for calculating a rotation angle for turning the container in either the forward direction or the reverse direction based on the output signal of the mark detection means,
A motor having a positioning function for rotating the container in the forward direction or in the reverse direction based on the signal of the rotation angle obtained by the angle calculation means after being transferred to the molding table side. A capping device, characterized in that:

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