JP2004123109A - Cap tightening method and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap tightening method and an apparatus therefor, which are inexpensive and suitable for a production line for producing a variety of articles in a small amount. <P>SOLUTION: The cap tightening apparatus comprises a chuck 2 for chucking a cap 1b temporarily fitted on a bottle body 1a, an actuator 3 for turning the chuck 2 to screw the cap 1b onto the bottle body 1a, a torque limiter 4 for cutting off a torque transmitted from the actuator 3 to the chuck 2 when the turn resistance of the chuck 2 exceeds a preset value following the fitting of the cap 1b on the bottle body 1a, and a sensor 5 for detecting the stoppage of a rotating shaft 12 and releasing the chucking of the chuck 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cap tightening method and a cap tightening device. More specifically, the present invention relates to a cap tightening method and a cap tightening device for screwing a cap into a bottle body with a predetermined torque to tighten the cap.
[0002]
[Prior art]
BACKGROUND ART Conventionally, there is an automatic capper as a device for screwing a cap into a bottle main body. This automatic capper clamps the bottle main body below the chuck, and lowers and rotates the chuck with the cap chucked so that the cap is screwed into the bottle main body and mounted. The chuck is rotated by rotation. In the automatic capper, in order to prevent the cap and the bottle main body from being damaged, the chuck is not rotated with a torque larger than a predetermined rotation torque.
[0003]
As means for preventing the rotation torque of the chuck from being larger than a predetermined value, for example, a distortion sensor is provided on a rotation shaft between the electric motor and the chuck to detect the rotation torque, and the detected rotation torque is equal to or more than a predetermined value. There is a method of controlling the electric motor so as not to be out of order. As another means, there is a method of detecting a current value of a servomotor for rotating a chuck and controlling the current value of the servomotor so as not to exceed a predetermined value.
[0004]
This automatic capper requires that the chuck be replaced with another one when the type of cap to be handled changes, and is not suitable for use in a high-mix low-volume production line. For this reason, in many kinds of small-lot production lines, the cap was often screwed into the bottle body by hand. In other words, the automatic capper and the manual operation were used properly according to the type of the production line.
[0005]
[Patent Document 1]
JP-A-2002-145391
[0006]
[Problems to be solved by the invention]
However, the above-mentioned automatic capper controls the rotation of the motor in order to prevent the rotation torque of the chuck from exceeding a predetermined value, so that an expensive motor and its control device are required, and the manufacturing cost is increased. .
[0007]
In addition, manual cap mounting work is a powerful and heavy labor.From the viewpoint of improving work contents, facilitating worker rotation planning, and improving productivity, etc. There was a request to introduce it. In addition, when the cap is manually attached, the tightening torque of the cap tends to vary, which causes a liquid leakage. There was a request to introduce a machine from the viewpoint of improving these points.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to provide a cap tightening method and a cap tightening apparatus which can be provided at a low cost and which is suitable for introduction into a line for high-mix low-volume production.
[0009]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 is to temporarily attach a cap to a bottle body, then chuck the cap to a chuck of a cap tightening device, rotate the chuck by an actuator, and screw the cap into the bottle body. When the cap is attached to the bottle body and the rotation resistance of the chuck becomes larger than the set value, the rotation transmitted from the actuator to the chuck is cut off by the torque limiter, and the rotation speed of the chuck is reduced. When it is detected that the speed is lower than the preset speed, the chucking of the chuck is released and the output of the actuator is stopped.
[0010]
Here, "the rotation speed of the chuck is lower than the preset speed" means that the rotation of the chuck is continued but the speed is lower than the set speed. This also includes the case of stopping. That is, the chucking of the chuck may be released by detecting that the rotation of the chuck has slowed, and the output of the actuator may be stopped. Also, the chucking of the chuck may be detected by detecting that the rotation of the chuck has stopped. And the output of the actuator may be stopped.
[0011]
If the cap, which is temporarily mounted, is screwed to a predetermined position of the bottle body by rotating the chuck, it becomes difficult to further screw the cap, and the rotation resistance of the chuck increases. Then, when the rotation resistance of the chuck becomes larger than a predetermined value, the rotation transmitted from the actuator to the chuck is cut off by the torque limiter. That is, when the cap is screwed to a predetermined position of the bottle main body and the rotation resistance becomes larger than a predetermined value, the rotation speed of the chuck becomes slow and stops. As a result, the cap is mounted on the bottle body with a predetermined tightening torque. That is, the cap can be mounted with a predetermined tightening torque without providing a sensor for detecting the rotational torque (rotational resistance) of the chuck and controlling the rotation of the actuator. When it is detected that the rotation speed of the chuck has become lower than the set speed, the chuck releases the cap and the actuator stops its output, so that the bottle can be removed.
[0012]
Further, in the cap fastening method according to the second aspect, the operation is stopped when at least the time during which the chuck is rotated reaches a preset time.
[0013]
In a state where the cap keeps running idle without being screwed into the bottle body for some reason, the cap cannot be tightened no matter how much the chuck is rotated. Since the time required for normally tightening the cap is almost fixed, if the rotation speed of the chuck does not become slower than a preset speed even after a long time, it is considered that the cap is idle. Therefore, when the time during which the chuck is rotated reaches a preset time, the operation is stopped, so that the operation can be stopped when the cap is idle.
[0014]
According to a third aspect of the present invention, there is provided a cap tightening device for chucking a cap temporarily attached to a bottle body, an actuator for screwing the cap into the bottle body by rotating the chuck, and attaching the cap to the bottle body. When the rotation resistance of the chuck becomes larger than a set value, a torque limiter for interrupting the rotation transmitted from the actuator to the chuck is provided.
[0015]
Therefore, when the actuator rotates the chuck, the temporarily mounted cap is screwed into the bottle body. If the cap is screwed into a predetermined position of the bottle body, it becomes difficult to screw the cap, so that the rotational resistance of the chuck increases. Then, when the rotation resistance of the chuck becomes larger than a predetermined value, the torque limiter operates to cut off the rotation transmitted from the actuator to the chuck. That is, when the cap is screwed to a predetermined position of the bottle main body, the rotation of the chuck stops and the actuator idles. As a result, the cap is mounted on the bottle body with a predetermined tightening torque. That is, the cap can be mounted with a predetermined tightening torque without providing a sensor for detecting the rotational torque (rotational resistance) of the chuck and controlling the rotation of the actuator.
[0016]
Further, the cap tightening device according to claim 4 includes a sensor for detecting a rotation state of the chuck, and the rotation speed of the chuck after the torque limiter stops the rotation transmitted from the actuator to the chuck is higher than a preset speed. When the sensor detects the delay, the chuck releases the cap and the actuator stops its output.
[0017]
Therefore, when the cap is attached to the bottle body with a predetermined tightening torque, the chuck releases the cap, and the bottle can be removed.
[0018]
Further, in the cap tightening device according to the fifth aspect, the chuck has a plurality of claw portions that move in the radial direction, and performs chucking by sandwiching the cap from the radial direction with the claw portions.
[0019]
Therefore, the chuck is sandwiched by a plurality of, for example, three claws so as to surround the cap. For this reason, even if the caps have different diameters, the cap can be clamped, and the cap can be clamped while the center axis of the cap coincides with the center axis of the chuck.
[0020]
Further, the cap tightening device according to claim 6 includes a timer for stopping the output of the actuator when at least the time during which the chuck is rotated reaches a preset time.
[0021]
In a state where the cap keeps running idle without being screwed into the bottle body for some reason, the cap cannot be tightened no matter how much the chuck is rotated. Since the time required for normally tightening the cap is almost fixed, if the rotation speed of the chuck does not become slower than a preset speed even after a long time, it is considered that the cap is idle. The timer measures the time during which the chuck is rotating, and when this time reaches a preset time, stops the output of the actuator. Therefore, the work can be stopped when the cap is idle.
[0022]
Further, the cap tightening device according to claim 7 includes a guide for guiding the cap temporarily mounted on the bottle body to the chuck. Therefore, the cap can be accurately and quickly guided to the chuck.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail based on the best mode shown in the drawings.
[0024]
FIG. 1 shows an example of an embodiment of a cap tightening device to which the present invention is applied. The cap tightening device includes a chuck 2 for chucking a cap 1b temporarily attached to a bottle body 1a of a bottle 1, an actuator 3 for screwing the cap 1b into the bottle body 1a by rotating the chuck 2, and a cap 1b. Is provided with a torque limiter 4 that cuts off the rotation transmitted from the actuator 3 to the chuck 2 when the rotation resistance of the chuck 2 becomes larger than a set value when the rotation resistance of the chuck 2 becomes larger than a set value. In the present embodiment, a sensor 5 for detecting the rotation state of the chuck 2 is provided, and the rotation speed of the chuck 2 after the torque limiter 4 stops the rotation transmitted from the actuator 3 to the chuck 2 is higher than a preset speed. When the sensor 5 detects that the speed has become too late, the chuck 2 releases the cap 1b and the actuator 3 stops its output.
[0025]
The cap tightening device is used, for example, installed on the work table 6. The actuator 3 is mounted on a frame 7 fixed on a base 21 via a bracket 8. The actuator 3 is, for example, a geared motor with a clutch / brake (hereinafter, referred to as a geared motor 3), and incorporates a reducer, clutch, and brake (not shown). The rotation of the output shaft of the geared motor 3 is transmitted to the pulley 9 → the timing belt 10 → the pulley 11 → the torque limiter 4 → the rotary shaft 12 → the chuck 2. The rotating shaft 12 is rotatably supported by the frame 7 by a pair of bearings 13 and 14.
[0026]
The torque limiter 4 transmits the rotation of the pulley 11 to the rotation shaft 12, and cuts off the rotation transmission when the rotation torque required to rotate the rotation shaft 12, that is, the rotation resistance of the rotation shaft 12 becomes larger than a predetermined value. . That is, the clutch is a clutch that shuts off the rotation transmission and causes the pulley 11 to run idle when the rotation resistance of the chuck 2 becomes larger than a predetermined value.
[0027]
The sensor 5 is, for example, a rotation sensor that detects the rotation of the rotating shaft 12 and is arranged below the torque limiter 4. The rotation sensor 5 is attached to the frame 7 via a bracket 15, and faces the rotation shaft 12. The rotation sensor 5 is, for example, a reflection-type optical sensor that detects a vertical stripe pattern of a black line and a white line attached to the rotation axis 12, and outputs an ON signal when a white line is detected. Do not output. When the rotating shaft 12 rotates and the vertical stripe pattern moves, the black line and the white line alternately face the rotation sensor 5, so that the rotation sensor 5 repeats on and off to output an on signal intermittently. On the other hand, when the rotation shaft 12 stops, the vertical stripe pattern is stationary with respect to the rotation sensor 5, so that the rotation sensor 5 is maintained in the on state or the off state. Therefore, if the state where the ON signal is output from the rotation sensor 5 or the state where the rotation sensor 5 ON signal is not output continues for a predetermined time (for example, 0.05 seconds) or more, it is determined that the rotating shaft 12 is stopped. be able to.
[0028]
The chuck 2 has a plurality of claws 2a that move in the radial direction, and chucks the cap 1b by clamping the cap 1b from the radial direction. In the present embodiment, the chuck 2 has three claws 2a, for example, as shown in FIG. 2, and holds the cap 1b from three directions. The three claws 2a are driven by an air cylinder mechanism.
[0029]
FIG. 3 shows a cross section of the chuck 2. The three claw portions 2a are attached to the bottom surface of the housing 2d so as to be slidable in the radial direction. As shown in FIG. 4, a groove 24 having a T-shaped cross section is formed on the inner side surface of the claw portion 2a, and the cross section formed on the outer peripheral surface of the wedge piece 2c is formed in the groove 24. Are slidably fitted in the T-shaped convex portion 25. The groove 24 and the protrusion 25 are arranged along the inclined surface of the wedge piece 2c. Therefore, the claw portion 2a moves in the radial direction due to the vertical movement (the vertical direction in FIG. 3) of the wedge piece 2c. A piston 2b is attached to the wedge piece 2c. When the piston 2b is moved downward by the compressed air, the claw portion 2a is pushed radially outward by the wedge piece 2c. That is, the pawl 2a is opened to release the chucking. When the piston 2b is moved upward by the compressed air, the claw 2a is moved radially inward by the wedge piece 2c. That is, the claws 2a are closed and chucking is performed.
[0030]
As described above, the three claw portions 2a move in the radial direction and are sandwiched (chucked) so as to surround the cap 1b, so that caps 1b having different diameters can be chucked, and the center axis of the cap 1b and The central axis of the chuck 2 can be matched. A rubber plate 16 is fixed to the cap holding surface of the claw portion 2a to prevent slippage, securely hold the cap 1b, and prevent damage to the cap 1b.
[0031]
The rotary shaft 12 has two passages 22 (only one is shown) for supplying compressed air to the chuck 2. Of the two passages 22, one passage 22 is connected to the upper pressure chamber 2 e of the chuck 2, and the other passage 22 is connected to the lower pressure chamber 2 f of the chuck 2. Compressed air is supplied to the two passages 22 from a pressure source (not shown) via a control valve 26 and a rotary joint 23 (FIG. 1). That is, when compressed air is supplied to the upper pressure chamber 2e of the chuck 2 by switching the flow path of the control valve 26, the piston 2b moves downward and the chuck 2 opens. On the other hand, when compressed air is supplied to the lower pressure chamber 2f of the chuck 2 by switching the flow path of the control valve 26, the piston 2b moves upward and the chuck 2 closes. The control valve 26 opens the passage 22 to which the compressed air is not supplied to the atmosphere, and removes the air in the pressure chambers 2e and 2f which are narrowed by the movement of the piston 2b. The control valve 26 is attached to an arm 27 that supports the upper end of the rotating shaft 12.
[0032]
A sensor 17 for detecting the presence or absence of the bottle 1 is arranged on a side of the chuck 2. This sensor 17 is attached to the frame 7.
[0033]
This cap fastening device includes first and second timers. The first timer is for performing chucking after a certain period of time after the detection of the bottle 1 by the sensor 17. The second timer is for rotating the chuck 2 after a certain time after the bottle 1 is chucked. Further, the cap tightening device includes a third timer that stops the output of the actuator 3 when at least the time during which the chuck 2 is rotated reaches a preset time. The third timer of the present embodiment stops the output of the actuator 3 when the elapsed time from the detection of the bottle 1 by the sensor 17 reaches a predetermined time.
[0034]
Next, a method of fastening the cap 1b will be described.
[0035]
In this method, after the cap 1b is temporarily mounted on the bottle body 1a, the cap 1b is chucked to the chuck 2 of the cap tightening device, and the chuck 2 is rotated by the actuator 3 to screw the cap 1b into the bottle body 1a. A method of tightening the cap 1b, wherein when the cap 1b is mounted on the bottle body 1a and the rotational resistance of the chuck 2 becomes larger than a set value, the rotation transmitted from the actuator 3 to the chuck 2 is cut off by a torque limiter; When it is detected that the rotation speed of the chuck 2 has become slower than a preset speed, the chucking of the chuck 2 is released and the output of the actuator 2 is stopped.
[0036]
In the present embodiment, for example, the cap 1b is attached to the bottle main body 1a according to the procedure shown in FIG. The operator temporarily attaches the cap 1b by screwing the cap 1b slightly into the bottle body 1a in advance, and integrates the bottle body 1a and the cap 1b as the bottle 1.
[0037]
First, an operator sets the torque value at which the rotation of the torque limiter 4 is interrupted by holding the chuck 2 by hand so that the chuck 2 does not rotate while the machine is stopped (step S31). That is, the torque limiter 4 is adjusted so that the torque limiter 4 operates at a predetermined value. The torque set here is the tightening torque of the cap 1b. Next, the switch of the geared motor 3 is turned on (step S32). In this state, the clutch of the geared motor 3 is in a disconnected (off) state, and the brake of the geared motor 3 is on. Turning on the switch of the geared motor 3 rotates the geared motor 3 (step S33).
[0038]
Next, the operator grasps the bottle main body 1a to which the cap 1b is temporarily attached, and inserts the bottle 1 from below the chuck 2 into the center of each claw 2a (step S33). The cap tightening device repeats step S34 until the bottle 1 is inserted between the claws 2a, and waits for the bottle 1 to be inserted. When the sensor 17 detects the insertion of the bottle 1 and turns on, the process proceeds from step S35 to step S36, in which the first timer is operated to wait for a predetermined time, for example, 0.2 seconds. That is, in order to prevent the worker from inserting the bottle 1 into the center of the claw portion 2a and chucking the cap 1b at the same time, chucking is performed after a certain period of time. Thereafter, the process proceeds to step S37, where the chuck 1 chucks the cap 1b. In the next step S38, the second timer is operated to wait for a predetermined time, for example, 0.1 second. After the cap 1b of the bottle 1 is chucked, a certain period of time is required until the chuck 2 starts to rotate, thereby further enhancing the safety of the operation. Thereafter, the clutch of the geared motor 3 is connected (turned on) and the brake is turned off (step S39). The bottle 1 does not fall even if the worker releases his / her hand from the bottle body 1a due to the chucking of the cap 1b. However, the worker holds the bottle body 1a as it is and supports it. The cap 1b is screwed into the bottle main body 1a by preventing the bottle main body 1a from rotating accordingly.
[0039]
By connecting the clutch of the geared motor 3 and releasing the brake, the rotation of the output shaft of the geared motor 3 is transmitted to the pulley 9, and transmitted from the pulley 9 to the timing belt 10, the pulley 11, the torque limiter 4, the rotary shaft 12, and the chuck 2. . That is, the chuck 2 rotates, and the cap 1b is screwed into the bottle main body 1a and tightened (step S40). When the cap 1b is screwed to a predetermined position of the bottle main body 1a, it is difficult to further screw the cap 1b, so that the rotational resistance of the chuck 2 increases and becomes larger than a predetermined value. As a result, the torque limiter 4 is operated, and the rotating shaft 12 is separated from the pulley 11 to make the pulley 11 idle. That is, when the cap 1b is tightened to the predetermined position of the bottle main body 1a with the predetermined tightening torque, the rotation speed of the chuck 2 decreases, and the rotation stops.
[0040]
When the rotation sensor 5 detects that the rotation speed of the chuck 2, that is, the rotation shaft 12 has become slower than the set value, the process proceeds from step S 41 to step S 42 to release the chucking of the cap 1 b and release the clutch of the geared motor 3. Disconnect (turn off) and turn on the brake (step S42). As a result, the output of the geared motor 3 stops, that is, the rotation of the output shaft stops, and the bottle 1 with the cap 1b mounted thereon can be removed from the cap tightening device. The operator replaces the bottle 1 and repeats the cap mounting operation. (Step S43 → Step S34).
[0041]
On the other hand, when ending the cap mounting operation, the switch of the geared motor 3 is turned off (step S44), and the operation ends.
[0042]
Step S45 is executed in parallel with the processing of steps S36 to S41. In step S45, the third timer measures the elapsed time from the detection of the bottle 1 by the sensor 17, and when a predetermined time, for example, 2.5 seconds, has elapsed since the detection of the bottle 1, the process proceeds to step S42. By doing so, it is possible to prevent the cap 1b from being screwed into the bottle body 1a and continuing to run idle.
[0043]
As described above, in the present invention, the cap 1b is tightened to the bottle main body 1a with the predetermined tightening torque by using the torque limiter 4, so that an expensive servomotor and a control system including sensors are not required. Thus, the cap tightening device can be provided at low cost.
[0044]
Further, since the chuck 2 moves the claw portion 2a in the radial direction and sandwiches the cap 1b so as to surround the cap 1b, it is possible to chuck the caps 1b having different diameters. And can be matched. For this reason, it becomes possible to mount caps of many types of bottles 1 with the same chuck 2, and the versatility of the cap tightening device can be improved. That is, it is possible to provide a cap tightening device that is suitable not only for use in a high-mix low-volume production line but also for use in a low-mix high-volume production line.
[0045]
Further, when the bottle 1 with the cap 1b is removed from the cap tightening device, the clutch of the geared motor 3 is disconnected, the brake is turned on, and the output of the geared motor 3 is stopped. Can be higher.
[0046]
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the spirit of the present invention.
[0047]
For example, a guide 18 for facilitating insertion of the bottle between the claw portions 2a of the chuck 2 may be provided. FIG. 8 shows an example of the guide 18. The guide 18 is fixed to a mounting plate 19 in which a hole 19a having a larger diameter than the bottle 1 is formed at the center. The mounting plate 19 is, for example, a disk. A mounting plate 19 is attached to a lower end of a cover 20 surrounding the chuck 2, and a guide 18 is arranged below the chuck 2. When the bottle 1 is inserted into the hole 19a of the mounting plate 19 from below, the guide 18 guides the bottle 1, so that it is easy to insert the bottle 1 at a correct position between the claw portions 2a of the chuck 2. In the above description, the mounting plate 19 is a disk, but is not limited to a disk, and may be, for example, a square plate.
[0048]
Further, the frame 7 may be attached so that the frame 7 can be inclined with respect to the pedestal 21. That is, the chuck 2 and the torque limiter 4 may be tilted, for example, in the front-rear direction or the left-right direction. Since the chuck 2 and the torque limiter 4 can be tilted, the angle of the chuck 2 can be changed according to the physical size and working environment of the worker, and the work can be performed easily. For example, the chuck 2 and the torque limiter 4 may be tiltable by 40 degrees in the front-rear direction with respect to the vertical.
[0049]
Further, the heights of the chuck 2 and the torque limiter 4 may be adjustable. By doing so, the height of the chuck can be changed according to the physique and working environment of the worker, and the work can be performed easily.
[0050]
In the above description, the third timer is moved when the process proceeds from step S35 to step S36. However, for example, the third timer is operated when the process proceeds from step S37 to step S38. Alternatively, when the process proceeds from step S39 to step S40 from FIG. 39, the third timer may be operated.
[0051]
【The invention's effect】
As described above, in the method for tightening the cap according to the first aspect, the torque transmitted from the actuator to the chuck when the cap is mounted on the bottle body and the rotation resistance of the chuck becomes larger than the set value is set by the torque limiter. When detecting that the rotation speed of the chuck has become slower than the preset speed, the chucking is released and the output of the actuator is stopped, so that the bottle body is tightened with a predetermined tightening torque. Can be fitted with a cap. That is, since the cap tightening torque can be kept constant without using a control system including expensive servomotors and sensors, the cost required for mounting the cap can be reduced.
[0052]
In the method for tightening the cap according to the second aspect, the work is stopped when at least the time during which the chuck is rotated reaches a preset time. Can be stopped.
[0053]
Further, in the cap tightening device according to the third aspect, the chuck for chucking the cap temporarily attached to the bottle main body, the actuator for screwing the cap into the bottle main body by rotating the chuck, and the cap being attached to the bottle main body. When the rotation resistance of the chuck becomes larger than a set value, a torque limiter for interrupting the rotation transmitted from the actuator to the chuck is provided, so that the cap can be attached to the bottle body with a predetermined tightening torque. For this reason, it is not necessary to use a control system including expensive servomotors and sensors, and the manufacturing cost of the cap tightening device can be significantly reduced.
[0054]
Further, the cap tightening device according to claim 4 includes a sensor for detecting a rotation state of the chuck, and the rotation speed of the chuck after the torque limiter stops the rotation transmitted from the actuator to the chuck is higher than a preset speed. When the sensor detects that it is late, the chuck releases the cap and the actuator stops its output, so when the cap is completed the chuck automatically releases the cap and removes the bottle. Can be.
[0055]
In the cap tightening device according to the fifth aspect, the chuck has a plurality of claw portions that move in the radial direction, and chucking is performed by sandwiching the cap from the radial direction with the claw portions. Caps can be attached to different types of bottles, and the versatility of the cap tightening device can be improved. That is, it is possible to provide a cap tightening device that is suitable not only for use in a high-mix low-volume production line but also for use in a low-mix high-volume production line.
[0056]
Further, in the cap tightening device according to claim 6, since the timer for stopping the output of the actuator when at least the time during which the chuck is rotated reaches a preset time is provided, the cap can idle and be tightened. If not, the work can be stopped.
[0057]
Furthermore, in the cap tightening device according to the seventh aspect, since the guide that guides the cap temporarily mounted on the bottle body to the chuck is provided, the cap can be accurately and quickly guided to the chuck, and the workability is improved. Can be.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of an embodiment of a cap tightening device to which the present invention is applied.
FIG. 2 is a bottom view of a chuck of the cap tightening device.
FIG. 3 is a sectional view of a chuck of the cap tightening device.
FIG. 4 is a sectional view of a groove of a claw portion of the chuck and a convex portion of a wedge piece.
FIG. 5 is a sectional view showing a passage of compressed air for operating the chuck.
FIG. 6 is a cross-sectional view showing a passage of compressed air for operating the chuck and enlarging a part thereof.
FIG. 7 is a flowchart showing an example of an embodiment of a method for tightening a cap to which the present invention is applied.
FIG. 8 is a perspective view showing a guide attached to the cap tightening device.
[Explanation of symbols]
1a Bottle body
1b cap
2 chuck
2a claw
3 Geared motor (actuator)
4 Torque limiter
5 Sensor that detects the rotation stop state of the chuck

Claims (7)

After the cap is temporarily mounted on the bottle main body, the cap is chucked to a chuck of a cap tightening device, the chuck is rotated by an actuator, and the cap is screwed into the bottle main body, and the cap is tightened. When the rotation resistance of the chuck is greater than a set value when attached to the bottle main body, the rotation transmitted from the actuator to the chuck is cut off by a torque limiter, and the rotation speed of the chuck is lower than a preset speed. A method for tightening the cap, wherein when the delay is detected, the chucking of the chuck is released and the output of the actuator is stopped. 2. The method according to claim 1, wherein the operation is stopped when at least a time during which the chuck is rotated reaches a preset time. A chuck for chucking a cap temporarily attached to the bottle body, an actuator for screwing the cap onto the bottle body by rotating the chuck, and a rotation resistance of the chuck when the cap is attached to the bottle body. A torque limiter for interrupting the rotation transmitted from the actuator to the chuck when is larger than a set value. A sensor for detecting a rotation state of the chuck, wherein the sensor detects that a rotation speed of the chuck after the torque limiter has stopped rotation transmitted from the actuator to the chuck has become lower than a preset speed. 4. The cap tightening device according to claim 3, wherein when a is detected, the chuck releases the cap, and the actuator stops its output. 5. The cap tightening device according to claim 3, wherein the chuck has a plurality of claw portions that move in a radial direction, and chucks the cap by clamping the cap from the radial direction with the claw portions. 6. The cap tightening device according to any one of claims 3 to 5, further comprising a timer for stopping the output of the actuator when at least a time during which the chuck is rotated reaches a preset time. The cap tightening device according to any one of claims 3 to 6, further comprising a guide for guiding a cap temporarily attached to the bottle body to the chuck.

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