EP3112275B1 - A device and a method for applying a cap to a package - Google Patents
A device and a method for applying a cap to a package Download PDFInfo
- Publication number
- EP3112275B1 EP3112275B1 EP15174824.1A EP15174824A EP3112275B1 EP 3112275 B1 EP3112275 B1 EP 3112275B1 EP 15174824 A EP15174824 A EP 15174824A EP 3112275 B1 EP3112275 B1 EP 3112275B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cap
- motor
- belts
- package
- thread entry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B7/00—Closing containers or receptacles after filling
- B65B7/16—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons
- B65B7/28—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers
- B65B7/2835—Closing semi-rigid or rigid containers or receptacles not deformed by, or not taking-up shape of, contents, e.g. boxes or cartons by applying separate preformed closures, e.g. lids, covers applying and rotating preformed threaded caps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67B—APPLYING CLOSURE MEMBERS TO BOTTLES JARS, OR SIMILAR CONTAINERS; OPENING CLOSED CONTAINERS
- B67B3/00—Closing bottles, jars or similar containers by applying caps
- B67B3/26—Applications of control, warning, or safety devices in capping machinery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67B—APPLYING CLOSURE MEMBERS TO BOTTLES JARS, OR SIMILAR CONTAINERS; OPENING CLOSED CONTAINERS
- B67B3/00—Closing bottles, jars or similar containers by applying caps
- B67B3/26—Applications of control, warning, or safety devices in capping machinery
- B67B3/262—Devices for controlling the caps
- B67B3/264—Devices for controlling the caps positioning of the caps
Definitions
- the invention relates to a device and a method for applying a cap to a package. More specifically the invention relates to a device and a method for applying a threaded cap to a threaded neck of a package.
- This type of devices comprises a conveyor, a package transport system, a cap dispenser and oppositely arranged and rotatable belts for rotating the cap on the package neck.
- Packages of this type are generally used in connection with packages for liquid foodstuff, such as milk, juice, water, yoghurt and similar, but can be used for other types of packages having a threaded neck.
- One common type of packages of this type is carton packages having a neck and a cap of plastic materials.
- One such type of device comprises a conveyor and a pair of package supporting belts for transporting packages in a travel direction, wherein a cap is supplied to the top of the neck when the package passes a cap dispenser. Then, the cap is tightened by means of a cap tightening device having oppositely arranged cap tightening belts for engaging and rotating the cap onto the neck.
- a cap tightening device having oppositely arranged cap tightening belts for engaging and rotating the cap onto the neck.
- a line of packages are transported on a continuously operating conveyor, wherein the continuously conveyed packages at short intervals pass the cap dispenser and wherein caps at short intervals are tightened by means of the cap tightening belts.
- EP0618168 discloses a capping machine having a rotary chuck for holding a cap, and screwthread-disengagement monitoring means.
- An object of the invention is to provide a device and a method which result in a reduced number of tilted caps and caps not being applied properly, wherein the number of discarded packages and the amount of discarded content can be reduced.
- the present invention relates to a device for applying a threaded cap to a threaded neck of a package, comprising a rotatable first belt and a rotatable second belt arranged opposite to the first belt for engaging and rotating the cap between said first and second belts, and wherein the device comprises at least one motor for rotating at least one of the first and second belts characterised in that the motor is coupled to a control device and a sensor for monitoring velocity, acceleration, torque and/or current of the motor, that the control device is arranged for controlling the operation of the motor, that the control device is arranged for setting the motor in a thread entry detecting mode in which the first and second belts rotate the cap in a direction opposite to a cap tightening direction, that the control device is arranged for detecting a thread entry by means of variations in motor velocity, acceleration, torque and/or current, and that the control device is arranged for setting the motor in another mode as a response to the detected thread entry and the device comprises a rotatable cap tightening third belt and
- the thread entries By rotating the cap in a reversed direction and monitoring one or more of the mentioned values (velocity, acceleration, torque and/or current) of the at least one motor driving the belts the thread entries can be detected in an efficient manner, so that the tightening of the cap can be more precise and the number of tilted caps can be reduced.
- a first motor can be connected to the first belt and a second motor can be connected to the second belt.
- the first motor can be coupled to a first sensor and the second motor can be coupled to a second sensor for monitoring the value, such as the velocity, of each of the motors.
- the control device can be arranged for calculating a resulting value, such as a resulting velocity, of the values, such as the velocities, of the first motor and the second motor and detecting a thread entry by means of said resulting value passing a threshold value.
- the resulting velocity of the first and second motors provides a reliable parameter for detecting thread entries, wherein thread entries can be detected with great accuracy.
- the resulting velocity can be a sum, a mean value or a difference of the velocities of the first motor and the second motor depending on the mechanical construction of the device and settings in the control device. Variations in motor velocities appear more clearly when monitoring the resulting velocity compared to monitoring the variations in motor velocities separately.
- a resulting acceleration, torque or current can be calculated and used for detecting thread entries in a similar manner.
- a combination of measured values (velocity, acceleration, torque and/or current) or calculated resulting values are used for detecting thread entries.
- the control device can be arranged for detecting a thread entry when an increasing motor velocity or acceleration, such as the resulting velocity or acceleration, passes a predetermined threshold value followed by a decrease in motor velocity or acceleration.
- the control device can be arranged for detecting a thread entry when a decreasing motor torque or motor current passes a predetermined threshold value followed by an increase in motor torque or motor current.
- the motor velocity increases rapidly when the friction between the threads momentarily is lost due to a thread entry and the required torque is reduced. Then, when the threads engage each other again the friction increases, which results in increased torque requirement and reduced motor velocity.
- monitoring a motor velocity increase followed by a motor velocity decrease further increases the reliability of the thread entry detection.
- the device can comprise a package conveyor and a pair of package supporting belts for continuously conveying the package. Hence, the packages can be conveyed continuously without stopping in a capping line, which results in efficient capping.
- the device can also comprise a detector for detecting the position of the cap along the conveyor before engaging the first and second belts. Hence, the position of the cap or the position of the package, which gives the position of the cap, e.g. by calculation, along the travel direction can be monitored by the device, e.g. by the control device.
- the device comprises a cap tightening device arranged after the first and second belts in the travelling direction, said cap tightening device having a third belt and a fourth belt for engaging and tightening the cap.
- the control device can be arranged for changing the first and second motors from the thread entry detecting mode to the other mode, such as a cap transport mode or a cap tightening mode, with a delay after thread entry detection, e.g. to compensate for motor operation change time and cap thread entries.
- the cap can be positioned in the desired position, such as in between thread entries to provide a stable and reliable tightening subsequent to thread entry detection.
- the cap can be positioned in the desired position on the neck, e.g. taking thread design into account and taking any system inertia into account.
- the device can comprise a cap top engaging element for biasing the cap towards the neck during thread entry detection.
- a cap top engaging element for biasing the cap towards the neck during thread entry detection.
- the present invention also relates to a method for applying a threaded cap to a threaded neck of a package as disclosed in claim 8. Further characteristics and advantages of the present invention will become apparent from the description of the embodiments below, the appended drawings and the dependent claims.
- a device 10 for applying a threaded cap 11 to a threaded neck 12 of a package 13 is illustrated schematically.
- the device 10 is arranged for applying caps 11 to packages 13, such as carton packages, plastic packages or packages of a combination of carton and plastic materials.
- the packages 13 are packages for liquid foodstuff.
- the package 13 is formed with a flat top.
- the package 13 is formed with an inclined top or is a gable top package.
- the cap 11 and neck 12 are of plastic materials.
- the neck 12 is provided in the top of the package 13 and extends at least partially vertically.
- the neck 12 is, for example, formed as a closure spout.
- the device 10 comprises a package transport system 14, a cap dispenser 15 and a cap tightening device 16.
- the package transport system 14 is arranged for supporting and transporting packages 13 in a travel direction, such as a horizontal or substantially horizontal travel direction.
- the package transport system 14 is arranged for continuously supporting packages 13 along the package transport system 14, wherein the packages 13, e.g., form a line of packages 13.
- the package transport system 14 comprises a rotatable first package supporting belt 17 and an opposite rotatable second package supporting belt 18 for engaging and supporting the packages 13.
- the first and second package supporting belts 17, 18 of the package transport system 14 are arranged for engaging opposite sides, such as opposite vertical sides, of the package 13.
- the first and second package supporting belts 17, 18 are mounted to pulleys 19 and are operated by one or more motors 20.
- the pulleys 19 are rotated around vertical axes for transporting the packages 13 in a horizontal direction.
- the pulleys 19 are supported by a supporting structure 21, which is illustrated schematically in the drawings and which can be of various designs.
- the package bottoms are supported by a conveyor 22, such as a conventional conveyor for conveying the packages 13.
- the conveyor 22 is arranged as a rotating belt or similar moving the packages 13 in the travel direction.
- the conveyor 22 rotates in the same speed as the first and second package supporting belts 17, 18 of the package transport system 14.
- the cap dispenser 15 is arranged for supplying caps 11 to the necks 12 of the packages 13.
- the cap dispenser 15 comprises a chute 23 for feeding caps 11 to a cap supplying position, in which position packages 13 moving on the conveyor 22 and in the package transport system 14 engages the caps 11.
- the chute 23 is, for example, connected to conventional cap storage and cap aligning means, which are not illustrated in the drawings.
- the device 10 comprises a rotatable first belt 24 and a rotatable second belt 25 arranged opposite to the first belt 24 for engaging and rotating the cap 11 between said first and second belts 24, 25.
- the first belt 24 is connected to a first motor 26 and the second belt 25 is connected to a second motor 27 for rotating said belts 24, 25.
- a single motor is arranged for rotating the first and second belts 24, 25
- the first and second belts 24, 25 are arranged for engaging the cap 11 and rotating the cap 11 of a package 13 being conveyed by the conveyor 22 and the package transport system 14.
- the first and second belts 24, 25 are arranged in parallel to the first and second package supporting belts 17, 18 of the package transport system 14.
- the first and second belts 24, 25 are rotated around vertical axes.
- the first motor 26 and the second motor 27 are e.g. rotary actuators allowing for control of velocity.
- the motors 26, 27 are electrical rotary actuators allowing for control of velocity, acceleration, angular position and current.
- the motors 26, 27 are servomotors.
- the motors 26, 27 are motors allowing measurement of velocity or rotational position in one or a few milliseconds intervals or less.
- the first motor 26 is coupled to a first sensor 28, wherein the second motor 27 is coupled to a second sensor 29, said sensors 28, 29 and a control device 30 being arranged for detecting velocity, acceleration, angular position and/or current of the motors 26, 27.
- the sensors 28, 29 are arranged for detecting velocity, acceleration, angular position and/or torque, wherein the control device 30 is arranged for detecting current.
- the motors 26, 27 and the sensors 28, 29 are connected to the control device 30 for monitoring and controlling the operation of the motors 26, 27 and thereby also controlling the operation of the first and second belts 24, 25.
- the control device 30 comprises a computer.
- the control device 30 comprises an input device and a monitor.
- the device 10 comprises a rotatable third belt 31 and a rotatable fourth belt 32 for engaging and rotating the cap 11.
- the third belt 31 is connected to a third motor 33 and the fourth belt 32 is connected to a fourth motor 34 for operating the third and fourth belts 31, 32.
- the third and fourth motors 33, 34 are coupled to a third and fourth sensor, respectively, and are connected to the control device 30.
- Supporting structures for the belts 25, 26, 33, 34 are not illustrated in the drawings or are simplified. However, such supporting structures are conventional.
- the third and fourth belts 31, 32 form the cap tightening device 16, wherein the first and second belts 24, 25 are arranged for detecting a thread entry of the cap 11 and neck 12 and the third and fourth belts 31, 32 are arranged for tightening the cap 11.
- the cap tightening device 16 is arranged for tightening caps 11 on the necks 12 of the packages 13 by rotating the caps 11.
- the third belt 31 is arranged opposite to the fourth belt 32 for tightening the cap 11 on the package neck 12 by rotation.
- the third and fourth belts 31, 32 are arranged for engaging the cap 11 and rotating the cap 11 of a package 13 being conveyed by the conveyor 22 and the package transport system 14.
- the third and fourth belts 31, 32 are for example aligned with the first and second belts 24, 25. For example, the third and fourth belts 31, 32 are rotated around vertical axes.
- the device 10 comprises a detector 35a and a position sensor 35b for detecting the position of the package 13, with or without the cap 11, before the cap 11 engages the first and second belts 24, 25.
- the detector 35a and the position sensor 35b are connected to the control device 30.
- the detector 35a is a sensor, such as a photocell or similar, detecting when a package 13 passes the detector 35a.
- the position sensor 35 b is connected to the motor 20 driving one of the package supporting belts 17, 18 to monitor a distance the motor 20 has driven the package supporting belt 17, 18 and hence the distance the package 13 has travelled since detection by the detector 35a.
- the position sensor 35b is connected to one of the pulleys 19, one of the axes driving the conveyor 22 or the motor driving the conveyor 22 to monitor the position of the package 13.
- the position sensor 42 is a rotation sensor measuring the number of revelations on the axis it is connected to.
- the control device 30 uses the measured value from the position sensor 35b to calculate a distance that the package supporting belts 17, 18 or the conveyor 22 has travelled since the measurement was initiated by a package 13 passing the detector 35a.
- the control device 30 calculates the position of the package 13 or the cap 11 in relation to the position in which the detector 35a was affected by the same package 13 or cap 11.
- the position sensor 35b comprises a pulse transducer or similar connected to the control device 30 for monitoring the position of the package 13 and/or cap 11 along the conveyor.
- the position of the cap 11 is monitored by the time lapsed since the package 13 passed the detector 35a., wherein a clock for indicating the lapsed time is started by the detector 35a.
- the position of the cap 11 in relation to the belts 24, 25 are detected or monitored in another suitable manner.
- the control device 30 includes a shift register (FIFO) or similar for monitoring the position of a plurality of packages 13 in the device 10 simultaneously.
- a cap top engaging element 36 for biasing the cap 11 towards the neck 12 when the cap 11 passes between the first and second belts 24, 25 is provided.
- the cap top engaging element 36 is arranged for biasing the cap 11 towards the neck 12 when the cap 11 passes between the first, second, third and fourth belts 24, 25, 31, 32.
- the cap top engaging element 36 is arranged as a top glide, wherein the top of the cap 11 at least partially slides along the cap top engaging element 36 during its transport by the first and second belts 24, 25 or during its transport by the first, second, third and fourth belts 24, 25, 31, 32.
- the cap top engaging element 36 comprises a rotating belt or similar.
- FIG. 2 an alternative embodiment is illustrated which is not in the scope of the invention, wherein the first and second belts 24, 25 form the cap tightening device 16.
- the operations of the first, second, third and fourth belts 24, 25, 31, 32 in Fig. 1 are combined to the first and second belts 24, 25 in the embodiment according to Fig. 2 .
- the length of the first and second belts 24, 25 are for example longer than in the embodiment of Fig. 1 .
- packages 13 are conveyed in the travel direction by means of the conveyor 22 and the package transport system 14, which travel direction is illustrated by means of the arrow A in the drawings.
- the conveyor 22 and the package transport system 14 is arranged for conveying the packages 13 continuously in the travel direction A, e.g. at a constant speed.
- the conveyor 22 and the package transport system 14 is arranged for conveying a single line of packages 13, so that one single package 13 at a time passes the detector 35a and so that one single package 13 at a time passes the cap dispenser 15.
- packages 13 are conveyed continuously and are continuously transported through the cap dispenser 15 and through the gap between the first and second belts 24, 25.
- the package 13 passes the detector 35a, wherein the position thereof along the conveyor 22 is detected.
- the detector 35a is arranged at the cap dispenser 15 or between the cap dispenser 15 and the first and second belts 24, 25 to detect the position of the cap 11 along the conveyor 22.
- the neck 12 engages a cap 11 and, by further movement of the package 13 in the travel direction A, pulls a cap 11 from the cap dispenser 15, wherein a cap 11 is applied on the top of the neck 12 without being tightened onto the neck 12, which is illustrated in Fig. 4 .
- the cap 11 is tilted or inclined in relation to the neck 12, wherein a front edge of the neck 12 of the package 13 travelling in the travel direction A is brought into contact with an inner surface of the cap 11, wherein the cap 11 is removed from the cap dispenser 15 and falls down on the neck 12, so that the cap 11 is carried by the neck 12. Then, the package 13 with the cap 11 being carried on the top of the neck 12 is conveyed to the first and second belts 24, 25, wherein the cap 11 is rotated in a direction opposite to the tightening direction, such as counter clockwise, to detect the thread entry, which is described in more detail below.
- the package 13 with the cap 11 is conveyed to the cap tightening device 16, wherein the cap 11 is tightened by rotation by means of the third and fourth belts 31, 32. Then, the package 13 exits the cap tightening device 16 for further handling. For example, after the thread entry has been detected or the cap 11 has been disengaged from the first and second belts 24, 25 the cap 11 of the next package 13 is introduced between the first and second belts 24, 25.
- a part of the device 10 is illustrated from above, wherein the cap top engaging element 36 has been removed.
- a number of packages 13 are conveyed on the conveyor 22.
- the packages 13 are supported by the first and second package supporting belts 17, 18.
- the packages 13 are conveyed continuously and adjacent each other.
- the packages 13 are conveyed with a gap between them.
- the detector 35a is arranged for detecting when a front part of the cap 11 carried by the package 13 passes the detector 35a in the travel direction A.
- the detector 35a is arranged in a position after the cap 11 has been applied to the neck 12 in the cap dispenser 15 and before the cap 11 engages the first and second belts 24, 25.
- the detector 35a and the control device 30 is arranged for monitoring the position of the cap 11 to determine the mode of operation of the first and second belts 24, 25 and also the third and fourth belts 31, 32 when applicable.
- the detector 35a and the control device 30 are connected to a pulse transducer of the motor operating the conveyor 22 or the motor 20 operating the package supporting belts 17, 18 or similar to monitor the position of the cap 11 along the travel direction A.
- the detector 35a is arranged for detecting when a rear part of the cap 11 carried by the package 13 passes the detector 35a in the travel direction A.
- FIGs. 8-19 one example of the operations of the belts 24, 25, 31, 32 are illustrated schematically for one package 13 passing through the device 10.
- packages 13 are conveyed continuously with suitable or no distance between the packages 13.
- packages 13 are conveyed adjacent to each other or with a gap between them.
- a package 13 has been provided with a cap 11 in the cap dispenser 15 and the position of the cap 11 has been detected by the detector 35a.
- the control device 30 is arranged to set the first and second belts 24, 25 in the transport mode a predetermined time after detecting the cap 11 by the detector 35a or after the package 13 has travelled a predetermined distance after detection of the cap 11 by the detector 35a.
- first and second belts 24, 25 rotate in the same velocity and in opposite directions, which is illustrated by the arrows B and C in Fig. 9 .
- the rotations of the first and second package supporting belts 17, 18 are illustrated by means of the arrows H and I.
- the third and fourth belts 31, 32 are, for example, tightening or transporting another cap (not illustrated) simultaneously as the first and second belts 24, 25 are transporting the cap 11, which is illustrated by means of the dash and dot arrows.
- the first and second belts 24, 25 are set in a thread detection mode, wherein the cap 11 is rotated in a direction opposite to the cap tightening direction, which is illustrated by means of the arrow on the cap 11 in Fig. 10 .
- the mode of operation of the first and second belts 24, 25 are changed by means of the control device 30 from the transport mode to the thread detection mode after the cap 11 has entered between the first and second belts 24, 25.
- the first and second belts 24, 25 are set in the thread detection mode before the cap 11 engages the first and second belts 24, 25. In the thread detection mode the velocity of the first belt 24 is increased in relation to the second belt 25 for reversed rotation of the cap 11.
- the direction of rotation of the second belt 25 is changed.
- the rotations of the first and second belts 24, 25 are illustrated by means of the arrows D and E in Fig. 11 .
- the third and fourth belts 31, 32 are, for example, tightening or transporting another cap 11 (not illustrated) simultaneously as the first and second belts 24, 25 are rotating the cap 11, which is illustrated by means of the dash and dot arrows.
- the first and second belts 24, 25 are set in the transport mode after detection of the thread entry. Hence, after detection of the thread entry and positioning of the cap 11 in the desired rotational position the mode of operation of the first and second belts 24, 25 are changed from the thread entry detecting mode to the transport mode for feeding out the cap 11 from the first and second belts 24, 25 without further rotation and, e.g., for receiving the cap of the next package 13 between the first and second belts 24, 25. Hence, the rotation of the first and second belts 24, 25 are set to rotate in the same speed and in opposite directions, which is illustrated by means of the arrows B and C in Fig. 13 .
- control device 30 is arranged for controlling the first and second motors 26, 27 to operate in the cap transport mode when the cap 11 enters between the first and second belts 24, 25, and then to operate in the thread entry detecting mode followed by a change back to the transport mode.
- control device 30 is arranged to operate the first and second motors 26, 27 in the thread entry detecting mode when the cap 11 engages the first and second belts 24, 25, followed by a change to the cap transport mode after detection of the thread entry.
- control device 30 is also arranged to position the cap 11 in the desired position taking into account the thread design of the cap 11 and the time or rotational distance for the first and second motors 26, 27 to stop and/or change speed and/or change direction once the thread entry has been detected.
- the third and fourth belts 31, 32 are, for example, tightening or transporting another cap 11 (not illustrated) simultaneously as the first and second belts 24, 25 are transporting the cap 11, which is illustrated by means of the dash and dot arrows.
- the cap 11 engages the third and fourth belts 31, 32 for tightening the cap 11 on the neck 12.
- the control device 30 is arranged to operate the third and fourth belts 31, 32 in a cap transport mode by means of the motors 33, 34 before the cap 11 engages the third and fourth belts 31, 32, which is illustrated by means of the arrows F and G in Fig. 15 .
- the cap transport mode the cap 11 is transported without rotation thereof.
- the operation of the third and fourth belts 31, 32 are changed to a cap tightening mode in which the cap 11 is tightened on the neck 12 by rotating the cap 11 by means of the third and fourth belts 31, 32, which is illustrated in Figs. 16 and 17 .
- the velocities of the third and fourth belts 31, 32 are changed.
- the direction of the third belt 31 is changed and the speed thereof is reduced, wherein the speed of the fourth belt 32 is increased while the direction thereof is maintained, which is illustrated by means of the arrows J and K in Fig. 17 , so as to provide a rapid tightening of the cap 11 by rotation.
- the cap 11 is tightened to a predetermined torque, which is measured on the third and/or fourth motors 33, 34, optionally taking into account the time or rotational distance for the third and fourth motors 33, 34 to change their speed or mode of operation back to the transport mode, which is illustrated in Figs. 18 and 19 .
- the mode of operation is changed to the transport mode, wherein the third and fourth belts 31, 32 are operated in a velocity and direction so as to transport the cap 11 without further rotation thereof, which is illustrated by means of the arrows F and G in Fig. 19 .
- the control device 30 is, for example, arranged to operate the third and fourth motors 33, 34 to drive the third and fourth belts 31, 32 in the cap transport mode before the cap 11 engages the third and fourth belts 31, 32 and then to change the mode of operation to the cap tightening mode followed by a change back to the cap transport mode once the cap has been tightened to the desired torque as measured on one or both of the third and fourth motors 33, 34.
- the first and second belts 24, 25 are, for example, rotating or transporting another cap 11 (not illustrated) simultaneously as the third and fourth belts 31, 32 are tightening or transporting the cap 11, which is illustrated by means of the dash and dot arrows.
- FIG. 20 and 21 detection of thread entry is illustrated by simplified and schematic examples of diagrams of the velocities of the first and second motors 26, 27 over time.
- the horizontal x-axis represents time.
- the x-axis represents a distance travelled by the package 13.
- the first and second motors 26, 27 drive the first and second belts 24, 25, respectively, in the thread detection mode and the transport mode by means of the control device 30, the detector 35a and the first and second sensors 28, 29 as described above.
- a continuous and constant speed command is applied to the first and second motors 26, 27 in the thread detection mode.
- the variation in resulting or single motor velocity is monitored and taken into account for detecting the thread entry.
- variations in acceleration or torque/current is monitored and taken into account to detect the thread entry.
- the dashed line 37 represents the velocity of the first motor 26 driving the first belt 24, wherein the continuous line 38 represents the velocity of the second motor 27 driving the second belt 25.
- a first thin line 39 represents detection of a package 13 or a cap 11 by the detector 35a.
- a second thin line 40 represents detection of a thread entry.
- the first and second motors 26, 27 operate at a substantially constant speed or at a substantially constant current during the cap transport mode.
- the first and second motors 26, 27 operate at a predetermined speed command.
- a predetermined time or travelled distance after detection of a cap 11 or a package 13 by the detector 35a the mode of operation of the first and second motors 26, 27 is changed from the cap transport mode to the thread entry detecting mode, wherein the velocities of the first and second motors 26, 27 are changed.
- the dashed line 37 goes up steeply and extensively, which indicates that the velocity of the first motor 26 increases rapidly and substantially.
- the first and second motors 26, 27 are operated in the cap transport mode when the cap 11 engages the first and second belts 24, 25.
- the first and second motors 26, 27 are operated in the thread detection mode when the cap 11 engages the first and second belts 24, 25.
- the cap 11 In the thread detection mode the cap 11 is rotated in the direction opposite the tightening direction, such as counter-clockwise.
- the threads of the cap 11 and the neck 12 are intermittently engaged and result in friction between the threads.
- the friction between the threads is, for example, partially determined by the cap top engaging portion 36 and the pressure applied to the cap 11 by it.
- the pressure applied on the cap 11 by the cap top engaging element 36 is adjustable.
- the velocities of the first and second motors 26, 27 are monitored by means of the first and second sensors 28, 29 and the control device 30.
- the control device 30 is arranged to detect a thread entry when the velocities of the first and second motors 26, 27 are increased to a predetermined value.
- the control device 30 is arranged to detect a thread entry when at least one of the velocities of the first and second motors 26, 27 is increased to a predetermined value.
- the control device 30 is arranged to detect a thread entry when at least one of the velocities of the first and second motors 26, 27 is increased to a predetermined value followed by a decrease. Moment of detection of a thread entry is illustrated by means of the second thin line 40.
- the mode of operation of the first and second motors 26, 27 is changed by means of the control device 30 from the thread entry detecting mode to the cap transport mode after detection of a thread entry.
- the control device 30 is arranged to stop the thread entry detecting mode and change to the cap transport mode a predetermined time or a predetermined package transport distance after detecting a thread entry to position the cap 11 in the desired position, e.g. taking into account the cap design, such as the number and positions of thread entries, and e.g. compensating for motor inertia, i.e. the time it takes for the motors 26, 27 to stop, change velocity and/or change direction.
- the cap 11 is positioned so that the thread entry of the cap 11 is positioned in between two thread entries, such as in the middle between two thread entries.
- the operation of the first and second belts 24, 25 is changed from reversed rotation of the cap 11 to the cap transport mode for conveying the package 13 without further rotation of the cap 11 by the first and second belts 24, 25.
- a schematic diagram of a resulting velocity of a detected velocity of the first motor 26 and a detected velocity of the second motor 27 is illustrated by means of a resulting velocity line 41.
- the resulting velocity is a subtraction between the two velocities.
- the resulting velocity is obtained as a mean value or a sum of the velocities.
- the detection of a cap 11 or a package by the detector 35a is illustrated by the first thin line 39.
- the cap 11 is then conveyed into engagement with the first and second belts 24, 25 operated in the cap transport mode by the first and second motors 26, 27 and the control device 30.
- the mode of operation is switched from cap transport mode to thread entry detecting mode, wherein the thread entry is detected as illustrated by means of the second thin line 40.
- a thread entry is detected as an increase in the resulting velocity such as the difference of the velocity of the first motor 26 and the velocity of the second motor 27, by a predetermined value.
- Velocity increases and decreases are indicated as peaks in the resulting velocity line 41. For example, a thread entry is detected as an increase in the resulting velocity followed by a decrease.
- said increase and decrease must be within a predetermined package travel distance or within a predetermined period of time to be construed as a thread entry.
- said increase and said decrease must reach predetermined threshold values for the monitored resulting velocity to be construed as a thread entry.
- one or more values in the form of velocity, acceleration, torque and/or current of a single motor is monitored to detect the thread entry as mentioned above.
- acceleration, torque and/or current of the first and second motors are monitored to detect the thread entry.
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Description
- The invention relates to a device and a method for applying a cap to a package. More specifically the invention relates to a device and a method for applying a threaded cap to a threaded neck of a package. This type of devices comprises a conveyor, a package transport system, a cap dispenser and oppositely arranged and rotatable belts for rotating the cap on the package neck.
- Packages of this type are generally used in connection with packages for liquid foodstuff, such as milk, juice, water, yoghurt and similar, but can be used for other types of packages having a threaded neck. One common type of packages of this type is carton packages having a neck and a cap of plastic materials.
- There is a plurality of different types of devices for applying a threaded cap to a threaded neck of a package by means of rotating belts in the prior art. One such type of device comprises a conveyor and a pair of package supporting belts for transporting packages in a travel direction, wherein a cap is supplied to the top of the neck when the package passes a cap dispenser. Then, the cap is tightened by means of a cap tightening device having oppositely arranged cap tightening belts for engaging and rotating the cap onto the neck. For example, a line of packages are transported on a continuously operating conveyor, wherein the continuously conveyed packages at short intervals pass the cap dispenser and wherein caps at short intervals are tightened by means of the cap tightening belts.
EP0618168 discloses a capping machine having a rotary chuck for holding a cap, and screwthread-disengagement monitoring means. - One problem with such prior art devices for applying a threaded cap to a threaded neck of a package is that a number of packages have tilted caps or caps not tightened correctly, which result in discarded packages and discarded content.
- An object of the invention is to provide a device and a method which result in a reduced number of tilted caps and caps not being applied properly, wherein the number of discarded packages and the amount of discarded content can be reduced.
- The present invention relates to a device for applying a threaded cap to a threaded neck of a package, comprising a rotatable first belt and a rotatable second belt arranged opposite to the first belt for engaging and rotating the cap between said first and second belts, and wherein the device comprises at least one motor for rotating at least one of the first and second belts characterised in that the motor is coupled to a control device and a sensor for monitoring velocity, acceleration, torque and/or current of the motor, that the control device is arranged for controlling the operation of the motor, that the control device is arranged for setting the motor in a thread entry detecting mode in which the first and second belts rotate the cap in a direction opposite to a cap tightening direction, that the control device is arranged for detecting a thread entry by means of variations in motor velocity, acceleration, torque and/or current, and that the control device is arranged for setting the motor in another mode as a response to the detected thread entry and the device comprises a rotatable cap tightening third belt and a rotatable cap tightening fourth belt arranged opposite to the third belt for tightening the cap on the package neck by rotation after detection of the thread entry by means of the first and second belts. By rotating the cap in a reversed direction and monitoring one or more of the mentioned values (velocity, acceleration, torque and/or current) of the at least one motor driving the belts the thread entries can be detected in an efficient manner, so that the tightening of the cap can be more precise and the number of tilted caps can be reduced.
- A first motor can be connected to the first belt and a second motor can be connected to the second belt. The first motor can be coupled to a first sensor and the second motor can be coupled to a second sensor for monitoring the value, such as the velocity, of each of the motors. The control device can be arranged for calculating a resulting value, such as a resulting velocity, of the values, such as the velocities, of the first motor and the second motor and detecting a thread entry by means of said resulting value passing a threshold value. The resulting velocity of the first and second motors provides a reliable parameter for detecting thread entries, wherein thread entries can be detected with great accuracy. The resulting velocity can be a sum, a mean value or a difference of the velocities of the first motor and the second motor depending on the mechanical construction of the device and settings in the control device. Variations in motor velocities appear more clearly when monitoring the resulting velocity compared to monitoring the variations in motor velocities separately. Alternatively, a resulting acceleration, torque or current can be calculated and used for detecting thread entries in a similar manner. Alternatively, a combination of measured values (velocity, acceleration, torque and/or current) or calculated resulting values are used for detecting thread entries.
- The control device can be arranged for detecting a thread entry when an increasing motor velocity or acceleration, such as the resulting velocity or acceleration, passes a predetermined threshold value followed by a decrease in motor velocity or acceleration. Alternatively, the control device can be arranged for detecting a thread entry when a decreasing motor torque or motor current passes a predetermined threshold value followed by an increase in motor torque or motor current. The motor velocity increases rapidly when the friction between the threads momentarily is lost due to a thread entry and the required torque is reduced. Then, when the threads engage each other again the friction increases, which results in increased torque requirement and reduced motor velocity. Hence, monitoring a motor velocity increase followed by a motor velocity decrease further increases the reliability of the thread entry detection.
- The device can comprise a package conveyor and a pair of package supporting belts for continuously conveying the package. Hence, the packages can be conveyed continuously without stopping in a capping line, which results in efficient capping. The device can also comprise a detector for detecting the position of the cap along the conveyor before engaging the first and second belts. Hence, the position of the cap or the position of the package, which gives the position of the cap, e.g. by calculation, along the travel direction can be monitored by the device, e.g. by the control device. The device comprises a cap tightening device arranged after the first and second belts in the travelling direction, said cap tightening device having a third belt and a fourth belt for engaging and tightening the cap.
- The control device can be arranged for changing the first and second motors from the thread entry detecting mode to the other mode, such as a cap transport mode or a cap tightening mode, with a delay after thread entry detection, e.g. to compensate for motor operation change time and cap thread entries. Hence, the cap can be positioned in the desired position, such as in between thread entries to provide a stable and reliable tightening subsequent to thread entry detection. Hence, the cap can be positioned in the desired position on the neck, e.g. taking thread design into account and taking any system inertia into account.
- The device can comprise a cap top engaging element for biasing the cap towards the neck during thread entry detection. By means of the cap top engaging element the thread of the cap is pressed towards and against the thread of the neck to provide a suitable amount of friction between said threads when the threads are engaged and thus provide a suitable motor velocity increase when the friction is reduced or when the friction cease for a brief moment when a thread entry is passed during rotation of the cap.
- The present invention also relates to a method for applying a threaded cap to a threaded neck of a package as disclosed in claim 8. Further characteristics and advantages of the present invention will become apparent from the description of the embodiments below, the appended drawings and the dependent claims.
- The invention will now be described more in detail with the aid of embodiment examples and with reference to the appended drawings, in which
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Fig. 1 is a schematic perspective view illustrating a part of a device for applying a cap to a package according to one embodiment of the present invention, in which a container conveyor, a package transport system, a part of a cap dispenser and belts for rotating the cap are illustrated schematically, and wherein a package is illustrated in the device, -
Fig. 2 is a schematic view according toFig. 1 , illustrating an alternative embodiment which is not in the scope of the invention, -
Fig. 3 is a schematic side view of a part of the device as illustrated inFig. 1 , partly in section and in which a part of the device has been removed, wherein packages are transported by means of the conveyor and the package transport system, -
Fig. 4 is a schematic side view according toFig. 3 , illustrating a package passing the cap dispenser for supplying a cap onto the top of the package neck before engaging the cap rotating belts, -
Fig. 5 is a schematic front view of a part of the device according to one embodiment, schematically illustrating a package in the device, -
Fig. 6 is a schematic view of a part of the device seen from above, -
Fig. 7 is a schematic front view according toFig. 6 , illustrating another alternative embodiment, -
Figs. 8 and 9 are schematic views from above, schematically illustrating a cap entering between first and second rotating belts and the rotation of the first and second belts in a cap transport mode according to one embodiment, -
Figs. 10 and 11 are schematic views from above, schematically illustrating the cap between the first and second rotating belts and the rotation of said belts in a thread entry detecting mode according to one embodiment, -
Figs. 12 and 13 are schematic views from above, schematically illustrating the cap between the first and second rotating belts and the rotation of said belts in a cap transport mode according to one embodiment, -
Figs. 14 and 15 are schematic views from above, schematically illustrating the cap between third and fourth rotating belts and the rotation of said belts in a cap transport mode according to one embodiment, -
Figs. 16 and 17 are schematic views from above, schematically illustrating the cap between the third and fourth rotating belts and the rotation of said belts in a cap tightening mode according to one embodiment, -
Figs. 18 and 19 are schematic views from above, schematically illustrating the cap between the third and fourth rotating belts and the rotation of said belts in a cap transport mode according to one embodiment, -
Fig. 20 is a schematic diagram illustrating one example of detected velocities of first and second motors driving the first and the second belts, respectively, according to one example, and -
Fig. 21 is a schematic diagram illustrating one example of a resulting velocity of detected velocities of the first and second motors for detecting a thread entry. - Referring to
Fig. 1 adevice 10 for applying a threadedcap 11 to a threadedneck 12 of apackage 13 is illustrated schematically. For example, thedevice 10 is arranged for applyingcaps 11 topackages 13, such as carton packages, plastic packages or packages of a combination of carton and plastic materials. For example, thepackages 13 are packages for liquid foodstuff. According to one embodiment, thepackage 13 is formed with a flat top. Alternatively, thepackage 13 is formed with an inclined top or is a gable top package. For example, thecap 11 andneck 12 are of plastic materials. According to one embodiment theneck 12 is provided in the top of thepackage 13 and extends at least partially vertically. Theneck 12 is, for example, formed as a closure spout. - The
device 10 comprises apackage transport system 14, acap dispenser 15 and acap tightening device 16. Thepackage transport system 14 is arranged for supporting and transportingpackages 13 in a travel direction, such as a horizontal or substantially horizontal travel direction. Thepackage transport system 14 is arranged for continuously supportingpackages 13 along thepackage transport system 14, wherein thepackages 13, e.g., form a line ofpackages 13. In the illustrated embodiment thepackage transport system 14 comprises a rotatable firstpackage supporting belt 17 and an opposite rotatable secondpackage supporting belt 18 for engaging and supporting thepackages 13. The first and secondpackage supporting belts package transport system 14 are arranged for engaging opposite sides, such as opposite vertical sides, of thepackage 13. The first and secondpackage supporting belts pulleys 19 and are operated by one ormore motors 20. For example, thepulleys 19 are rotated around vertical axes for transporting thepackages 13 in a horizontal direction. Thepulleys 19 are supported by a supportingstructure 21, which is illustrated schematically in the drawings and which can be of various designs. In the illustrated embodiment the package bottoms are supported by aconveyor 22, such as a conventional conveyor for conveying thepackages 13. Theconveyor 22 is arranged as a rotating belt or similar moving thepackages 13 in the travel direction. For example, theconveyor 22 rotates in the same speed as the first and secondpackage supporting belts package transport system 14. - The
cap dispenser 15 is arranged for supplyingcaps 11 to thenecks 12 of thepackages 13. In the illustrated embodiment thecap dispenser 15 comprises achute 23 for feedingcaps 11 to a cap supplying position, in which position packages 13 moving on theconveyor 22 and in thepackage transport system 14 engages thecaps 11. Thechute 23 is, for example, connected to conventional cap storage and cap aligning means, which are not illustrated in the drawings. - The
device 10 comprises a rotatablefirst belt 24 and a rotatablesecond belt 25 arranged opposite to thefirst belt 24 for engaging and rotating thecap 11 between said first andsecond belts first belt 24 is connected to afirst motor 26 and thesecond belt 25 is connected to asecond motor 27 for rotating saidbelts second belts second belts cap 11 and rotating thecap 11 of apackage 13 being conveyed by theconveyor 22 and thepackage transport system 14. The first andsecond belts package supporting belts package transport system 14. For example, the first andsecond belts first motor 26 and thesecond motor 27 are e.g. rotary actuators allowing for control of velocity. For example, themotors motors motors first motor 26 is coupled to afirst sensor 28, wherein thesecond motor 27 is coupled to asecond sensor 29, saidsensors control device 30 being arranged for detecting velocity, acceleration, angular position and/or current of themotors sensors control device 30 is arranged for detecting current. Themotors sensors control device 30 for monitoring and controlling the operation of themotors second belts control device 30 comprises a computer. In the illustrated embodiment thecontrol device 30 comprises an input device and a monitor. - In the embodiment of
Fig. 1 thedevice 10 comprises a rotatablethird belt 31 and a rotatablefourth belt 32 for engaging and rotating thecap 11. Thethird belt 31 is connected to athird motor 33 and thefourth belt 32 is connected to afourth motor 34 for operating the third andfourth belts fourth motors control device 30. Supporting structures for thebelts Fig. 1 the third andfourth belts cap tightening device 16, wherein the first andsecond belts cap 11 andneck 12 and the third andfourth belts cap 11. Thecap tightening device 16 is arranged for tighteningcaps 11 on thenecks 12 of thepackages 13 by rotating thecaps 11. Thethird belt 31 is arranged opposite to thefourth belt 32 for tightening thecap 11 on thepackage neck 12 by rotation. The third andfourth belts cap 11 and rotating thecap 11 of apackage 13 being conveyed by theconveyor 22 and thepackage transport system 14. The third andfourth belts second belts fourth belts - The
device 10 comprises adetector 35a and aposition sensor 35b for detecting the position of thepackage 13, with or without thecap 11, before thecap 11 engages the first andsecond belts detector 35a and theposition sensor 35b are connected to thecontrol device 30. For example, thedetector 35a is a sensor, such as a photocell or similar, detecting when apackage 13 passes thedetector 35a. In the illustrated embodiment, theposition sensor 35 b is connected to themotor 20 driving one of thepackage supporting belts motor 20 has driven thepackage supporting belt package 13 has travelled since detection by thedetector 35a. Alternatively, theposition sensor 35b is connected to one of thepulleys 19, one of the axes driving theconveyor 22 or the motor driving theconveyor 22 to monitor the position of thepackage 13. For example, the position sensor 42 is a rotation sensor measuring the number of revelations on the axis it is connected to. Thecontrol device 30 uses the measured value from theposition sensor 35b to calculate a distance that thepackage supporting belts conveyor 22 has travelled since the measurement was initiated by apackage 13 passing thedetector 35a. Hence, by means of thedetector 35a and the position sensor 42 thecontrol device 30 calculates the position of thepackage 13 or thecap 11 in relation to the position in which thedetector 35a was affected by thesame package 13 orcap 11. For example, theposition sensor 35b comprises a pulse transducer or similar connected to thecontrol device 30 for monitoring the position of thepackage 13 and/orcap 11 along the conveyor. Alternatively, the position of thecap 11 is monitored by the time lapsed since thepackage 13 passed the detector 35a., wherein a clock for indicating the lapsed time is started by thedetector 35a. Alternatively, the position of thecap 11 in relation to thebelts control device 30 includes a shift register (FIFO) or similar for monitoring the position of a plurality ofpackages 13 in thedevice 10 simultaneously. - A cap
top engaging element 36 for biasing thecap 11 towards theneck 12 when thecap 11 passes between the first andsecond belts top engaging element 36 is arranged for biasing thecap 11 towards theneck 12 when thecap 11 passes between the first, second, third andfourth belts top engaging element 36 is arranged as a top glide, wherein the top of thecap 11 at least partially slides along the captop engaging element 36 during its transport by the first andsecond belts fourth belts top engaging element 36 comprises a rotating belt or similar. - With reference to
Fig. 2 an alternative embodiment is illustrated which is not in the scope of the invention, wherein the first andsecond belts cap tightening device 16. Hence, the operations of the first, second, third andfourth belts Fig. 1 are combined to the first andsecond belts Fig. 2 . In such an embodiment the length of the first andsecond belts Fig. 1 . - With reference to
Figs. 3-5 packages 13 are conveyed in the travel direction by means of theconveyor 22 and thepackage transport system 14, which travel direction is illustrated by means of the arrow A in the drawings. Theconveyor 22 and thepackage transport system 14 is arranged for conveying thepackages 13 continuously in the travel direction A, e.g. at a constant speed. Theconveyor 22 and thepackage transport system 14 is arranged for conveying a single line ofpackages 13, so that onesingle package 13 at a time passes thedetector 35a and so that onesingle package 13 at a time passes thecap dispenser 15. For example, packages 13 are conveyed continuously and are continuously transported through thecap dispenser 15 and through the gap between the first andsecond belts - During transport along the
conveyor 22 and thepackage transport system 14 thepackage 13 passes thedetector 35a, wherein the position thereof along theconveyor 22 is detected. Alternatively, thedetector 35a is arranged at thecap dispenser 15 or between thecap dispenser 15 and the first andsecond belts cap 11 along theconveyor 22. In thecap dispenser 15 theneck 12 engages acap 11 and, by further movement of thepackage 13 in the travel direction A, pulls acap 11 from thecap dispenser 15, wherein acap 11 is applied on the top of theneck 12 without being tightened onto theneck 12, which is illustrated inFig. 4 . For example, thecap 11 is tilted or inclined in relation to theneck 12, wherein a front edge of theneck 12 of thepackage 13 travelling in the travel direction A is brought into contact with an inner surface of thecap 11, wherein thecap 11 is removed from thecap dispenser 15 and falls down on theneck 12, so that thecap 11 is carried by theneck 12. Then, thepackage 13 with thecap 11 being carried on the top of theneck 12 is conveyed to the first andsecond belts cap 11 is rotated in a direction opposite to the tightening direction, such as counter clockwise, to detect the thread entry, which is described in more detail below. Then, after detection of the thread entry thepackage 13 with thecap 11 is conveyed to thecap tightening device 16, wherein thecap 11 is tightened by rotation by means of the third andfourth belts package 13 exits thecap tightening device 16 for further handling. For example, after the thread entry has been detected or thecap 11 has been disengaged from the first andsecond belts cap 11 of thenext package 13 is introduced between the first andsecond belts - With reference to
Fig. 6 a part of thedevice 10 is illustrated from above, wherein the captop engaging element 36 has been removed. In the embodiment ofFig. 6 a number ofpackages 13 are conveyed on theconveyor 22. In the embodiment ofFig. 6 thepackages 13 are supported by the first and secondpackage supporting belts packages 13 are conveyed continuously and adjacent each other. Alternatively, thepackages 13 are conveyed with a gap between them. Thedetector 35a is arranged for detecting when a front part of thecap 11 carried by thepackage 13 passes thedetector 35a in the travel direction A. Hence, thedetector 35a is arranged in a position after thecap 11 has been applied to theneck 12 in thecap dispenser 15 and before thecap 11 engages the first andsecond belts detector 35a and thecontrol device 30 is arranged for monitoring the position of thecap 11 to determine the mode of operation of the first andsecond belts fourth belts detector 35a and thecontrol device 30 are connected to a pulse transducer of the motor operating theconveyor 22 or themotor 20 operating thepackage supporting belts cap 11 along the travel direction A. With reference toFig. 7 thedetector 35a is arranged for detecting when a rear part of thecap 11 carried by thepackage 13 passes thedetector 35a in the travel direction A. - With reference to
Figs. 8-19 one example of the operations of thebelts package 13 passing through thedevice 10. However, it is to be understood that packages 13 are conveyed continuously with suitable or no distance between thepackages 13. For example, packages 13 are conveyed adjacent to each other or with a gap between them. - In
Figs. 8 and 9 apackage 13 has been provided with acap 11 in thecap dispenser 15 and the position of thecap 11 has been detected by thedetector 35a. Before thecap 11 engages the first andsecond belts second belts conveyor 22 without rotating thecap 11. Hence, thecontrol device 30 is arranged to set the first andsecond belts cap 11 by thedetector 35a or after thepackage 13 has travelled a predetermined distance after detection of thecap 11 by thedetector 35a. Hence, the first andsecond belts Fig. 9 . The rotations of the first and secondpackage supporting belts fourth belts second belts cap 11, which is illustrated by means of the dash and dot arrows. - With reference to
Figs. 10 and 11 the first andsecond belts cap 11 is rotated in a direction opposite to the cap tightening direction, which is illustrated by means of the arrow on thecap 11 inFig. 10 . Hence, in the illustrated embodiment the mode of operation of the first andsecond belts control device 30 from the transport mode to the thread detection mode after thecap 11 has entered between the first andsecond belts second belts cap 11 engages the first andsecond belts first belt 24 is increased in relation to thesecond belt 25 for reversed rotation of thecap 11. In the illustrated embodiment the direction of rotation of thesecond belt 25 is changed. The rotations of the first andsecond belts Fig. 11 . The third andfourth belts second belts cap 11, which is illustrated by means of the dash and dot arrows. - With reference to
Figs. 12 and 13 the first andsecond belts cap 11 in the desired rotational position the mode of operation of the first andsecond belts cap 11 from the first andsecond belts next package 13 between the first andsecond belts second belts Fig. 13 . Hence, according to the illustrated embodiment thecontrol device 30 is arranged for controlling the first andsecond motors cap 11 enters between the first andsecond belts control device 30 is arranged to operate the first andsecond motors cap 11 engages the first andsecond belts control device 30 is also arranged to position thecap 11 in the desired position taking into account the thread design of thecap 11 and the time or rotational distance for the first andsecond motors fourth belts second belts cap 11, which is illustrated by means of the dash and dot arrows. - With reference to
Figs. 14 and 15 thecap 11 engages the third andfourth belts cap 11 on theneck 12. Hence, after detection of the thread entry and positioning of thecap 11 in the desired rotational position by means of the first andsecond belts package 13 with thecap 11 is conveyed to the third andfourth belts cap 11. In the illustrated embodiment thecontrol device 30 is arranged to operate the third andfourth belts motors cap 11 engages the third andfourth belts Fig. 15 . In the cap transport mode thecap 11 is transported without rotation thereof. Then, the operation of the third andfourth belts cap 11 is tightened on theneck 12 by rotating thecap 11 by means of the third andfourth belts Figs. 16 and 17 . Hence, the velocities of the third andfourth belts third belt 31 is changed and the speed thereof is reduced, wherein the speed of thefourth belt 32 is increased while the direction thereof is maintained, which is illustrated by means of the arrows J and K inFig. 17 , so as to provide a rapid tightening of thecap 11 by rotation. For example, thecap 11 is tightened to a predetermined torque, which is measured on the third and/orfourth motors fourth motors Figs. 18 and 19 . Hence, after tightening thecap 11 to the desired torque by means of the third andfourth belts fourth belts cap 11 without further rotation thereof, which is illustrated by means of the arrows F and G inFig. 19 . Thecontrol device 30 is, for example, arranged to operate the third andfourth motors fourth belts cap 11 engages the third andfourth belts fourth motors second belts fourth belts cap 11, which is illustrated by means of the dash and dot arrows. - With reference to
Figs. 20 and 21 detection of thread entry is illustrated by simplified and schematic examples of diagrams of the velocities of the first andsecond motors package 13. The first andsecond motors second belts control device 30, thedetector 35a and the first andsecond sensors second motors - With reference to
Fig. 20 the dashedline 37 represents the velocity of thefirst motor 26 driving thefirst belt 24, wherein thecontinuous line 38 represents the velocity of thesecond motor 27 driving thesecond belt 25. A firstthin line 39 represents detection of apackage 13 or acap 11 by thedetector 35a. A secondthin line 40 represents detection of a thread entry. In the illustrated example, the first andsecond motors second motors cap 11 or apackage 13 by thedetector 35a the mode of operation of the first andsecond motors second motors Fig. 20 by thecontinuous line 38 going down steeply and extensively, which indicates that the velocity of thesecond motor 27 increases rapidly and substantially in a direction opposite of thefirst motor 26. The dashedline 37, on the other hand, goes up steeply and extensively, which indicates that the velocity of thefirst motor 26 increases rapidly and substantially. For example, the first andsecond motors cap 11 engages the first andsecond belts second motors cap 11 engages the first andsecond belts cap 11 is rotated in the direction opposite the tightening direction, such as counter-clockwise. During rotation in the direction opposite the tightening direction the threads of thecap 11 and theneck 12 are intermittently engaged and result in friction between the threads. The friction between the threads is, for example, partially determined by the captop engaging portion 36 and the pressure applied to thecap 11 by it. For example, the pressure applied on thecap 11 by the captop engaging element 36 is adjustable. After thecap 11 has reached its uppermost position by rotation in the direction opposite tightening direction the threads are disengaged for a moment and thecap 11 falls down, wherein thecap 11 andneck 12 are positioned in a thread entry position. When the threads are disengaged and thecap 11 drops down the friction between the threads drops suddenly and the velocities of the first andsecond motors cap 11 is rotated upwards along the thread of theneck 12, which results in an increase in friction between the threads and a temporary reduction in the velocities of the first andsecond motors second motors device 30 cannot immediately correct the velocities of the first andsecond motors second motors continuous line 38 and the dashedline 37 in the diagram ofFig. 20 . Every time a thread entry is encountered variations in the velocities of the first andsecond motors second motors second sensors control device 30. For example, thecontrol device 30 is arranged to detect a thread entry when the velocities of the first andsecond motors control device 30 is arranged to detect a thread entry when at least one of the velocities of the first andsecond motors control device 30 is arranged to detect a thread entry when at least one of the velocities of the first andsecond motors thin line 40. According to one embodiment the mode of operation of the first andsecond motors control device 30 from the thread entry detecting mode to the cap transport mode after detection of a thread entry. For example, thecontrol device 30 is arranged to stop the thread entry detecting mode and change to the cap transport mode a predetermined time or a predetermined package transport distance after detecting a thread entry to position thecap 11 in the desired position, e.g. taking into account the cap design, such as the number and positions of thread entries, and e.g. compensating for motor inertia, i.e. the time it takes for themotors cap 11 is positioned so that the thread entry of thecap 11 is positioned in between two thread entries, such as in the middle between two thread entries. Hence, after detecting the thread entry the operation of the first andsecond belts cap 11 to the cap transport mode for conveying thepackage 13 without further rotation of thecap 11 by the first andsecond belts - With reference to
Fig. 21 a schematic diagram of a resulting velocity of a detected velocity of thefirst motor 26 and a detected velocity of thesecond motor 27 is illustrated by means of a resultingvelocity line 41. In the illustrated embodiment the resulting velocity is a subtraction between the two velocities. Alternatively, the resulting velocity is obtained as a mean value or a sum of the velocities. - The detection of a
cap 11 or a package by thedetector 35a is illustrated by the firstthin line 39. In the illustrated embodiment thecap 11 is then conveyed into engagement with the first andsecond belts second motors control device 30. Then the mode of operation is switched from cap transport mode to thread entry detecting mode, wherein the thread entry is detected as illustrated by means of the secondthin line 40. A thread entry is detected as an increase in the resulting velocity such as the difference of the velocity of thefirst motor 26 and the velocity of thesecond motor 27, by a predetermined value. Velocity increases and decreases are indicated as peaks in the resultingvelocity line 41. For example, a thread entry is detected as an increase in the resulting velocity followed by a decrease. For example said increase and decrease must be within a predetermined package travel distance or within a predetermined period of time to be construed as a thread entry. For example, said increase and said decrease must reach predetermined threshold values for the monitored resulting velocity to be construed as a thread entry. When a thread entry is detected, as illustrated by the secondthin line 40, thecap 11 is further rotated in the reversed direction, wherein further thread entries are passed, which is illustrated by the peaks following the secondthin line 40 inFig. 21 , before the mode of operation of first andsecond motors second motors - According to different alternative embodiments one or more values in the form of velocity, acceleration, torque and/or current of a single motor is monitored to detect the thread entry as mentioned above. Alternatively, acceleration, torque and/or current of the first and second motors are monitored to detect the thread entry.
Claims (13)
- A device (10) for applying a threaded cap (11) to a threaded neck (12) of a package (13), comprising means for engaging and rotating the cap (11) wherein the device comprises at least one motor for rotating the means, wherein the motor (26, 27) is coupled to a control device (30) and a sensor (28, 29) for monitoring velocity, acceleration, torque and/or current of the motor (26, 27), wherein the control device (30) is arranged for controlling the operation of the motor (26, 27), wherein the control device (30) is arranged for setting the motor (26, 27) in a thread entry detecting mode in which the means rotate the cap (11) in a direction opposite to a cap tightening direction, wherein the control device (30) is arranged for detecting a thread entry by means of variations in motor velocity, acceleration, torque and/or current, wherein the control device (30) is arranged for setting the motor (26, 27) in another mode as a response to the detected thread entry, the device characterised in that the means are a rotatable first belt (24) and a rotatable second belt (25) arranged opposite to the first belt (24) for engaging and rotating the cap (11) between said first and second belts (24,25) wherein the motor rotates at least one of the first and second belts (24,25) and also in that the device (10) further comprises a rotatable cap tightening third belt (31) and a rotatable cap tightening fourth belt (32) arranged opposite to the third belt (31) for tightening the cap (11) on the package neck (12) by rotation after detection of the thread entry by means of the first and second belts (24, 25).
- A device according to claim 1, wherein the control device (30) is arranged for detecting a thread entry whenan increase in motor velocity or motor acceleration exceeds a predetermined threshold value followed by a decrease in motor velocity or motor acceleration, ora decrease in motor torque or motor current exceeds a predetermined threshold value followed by an increase in motor torque or motor current.
- A device according to claim 1 or 2, wherein a first motor (26) is coupled to a first sensor (28) and a second motor (27) is coupled to a second sensor (29) for monitoring the velocity and/or acceleration of the first and second motors (26, 27), which first and second sensors (28, 29) are connected to the control device (30), wherein the control device (30) is arranged for calculating a resulting value of the monitored values of the first motor (26) and/or the second motor (27), and detecting a thread entry by means of said resulting value or by means of one of the said monitored values exceeding a threshold value.
- A device according to any of the preceding claims, comprising a package conveyor (22) for continuously conveying the package (13) in a travel direction (A), a package transport system (14) for supporting the package (13) on the conveyor (22), a cap dispenser (15) for supplying the cap (11) to the neck (12) of a package (13) conveyed by the conveyor (22), and a detector (35a) for detecting the position of the cap (11) along the conveyor (22) before engaging the first and second belts (24, 25).
- A device according to any of the preceding claims, wherein the control device (30) is arranged for changing the motor (26, 27) from the thread entry detecting mode to the other mode with a predetermined delay after thread entry detection.
- A device according to any of the preceding claims, wherein the control device (30) is arranged for setting the motor (26, 27) in a transport mode after detection of a thread entry, in which transport mode the cap (11) is transported along the first and second belts (24, 25) without rotating.
- A device according to any of the preceding claims, comprising a cap top engaging element (36) for biasing the cap (11) towards the neck (12) during thread entry detection.
- A method for applying a threaded cap (11) to a threaded neck (12) of a package (13), comprising the steps ofa) supplying the cap (11) to the neck (12),b) engaging the cap (11) by a rotatable first belt (24) and a rotatable second belt (25) arranged opposite to the first belt (24),c) rotating the cap (11) in a direction opposite to a cap tightening direction by means of at least one motor (26, 27) connected to the first and second belts (24, 25),d) monitoring velocity, acceleration, torque and/or current of the at least one motor (26, 27) by means of a sensor (28, 29) and a control device (30),e) detecting a thread entry of the cap (11) and neck (12) by variations in motor velocity, acceleration, torque and/or current andf) subsequent to step e, tightening the cap (11) on the neck (12) by means of a rotatable cap tightening third belt (31) and a rotatable cap tightening fourth belt (32) arranged opposite to the third belt (31).
- A method according to claim 8, comprising the step ofdetecting the thread entry bythe motor velocity or motor acceleration exceeding a predetermined threshold value followed by a decrease in motor velocity or motor acceleration, ora decrease in motor torque or motor current exceeding a predetermined threshold value followed by an increase in motor torque or motor current.
- A method according to claim 8 or 9, comprising the steps ofmonitoring the velocity, acceleration, torque and/or current of the first motor (26) by means of a first sensor (28) and the control device (30),monitoring the velocity, acceleration, torque and/or current of the second motor (27) by means of a second sensor (29) and the control device (30),calculating a resulting value of the values of the first motor (26) and the second motor (27), anddetecting a thread entry by means of said resulting value or by means of one of the said monitored values exceeding a threshold value.
- A method according to any of claims 8-10, comprising the step of changing the mode of operation of the motor (26, 27) from the thread entry detecting mode to the other mode with a delay after thread entry detection.
- A method according to any of claims 8-11, comprising the step of setting the motor (26, 27) in a transport mode after detection of a thread entry, in which transport mode the cap (11) is transported along the first and second belts (24, 25) without rotating.
- A method according to any of claims 8-12, comprising the step of biasing the cap (11) towards the neck (12) at least during thread entry detection.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15174824.1A EP3112275B1 (en) | 2015-07-01 | 2015-07-01 | A device and a method for applying a cap to a package |
PCT/EP2016/064276 WO2017001238A1 (en) | 2015-07-01 | 2016-06-21 | A device and a method for applying a cap to a package |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15174824.1A EP3112275B1 (en) | 2015-07-01 | 2015-07-01 | A device and a method for applying a cap to a package |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3112275A1 EP3112275A1 (en) | 2017-01-04 |
EP3112275B1 true EP3112275B1 (en) | 2018-01-31 |
Family
ID=53541520
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15174824.1A Not-in-force EP3112275B1 (en) | 2015-07-01 | 2015-07-01 | A device and a method for applying a cap to a package |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3112275B1 (en) |
WO (1) | WO2017001238A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2615927B8 (en) * | 2017-01-31 | 2017-12-28 | Sapli Solutions, S.L. | MACHINE FOR PLACEMENT OF COVERS IN CONTAINERS AND METHOD OF PLACEMENT OF A COVER IN A CONTAINER |
US10508012B2 (en) * | 2018-02-09 | 2019-12-17 | PSR Automation Inc. | Universal synchronized capping machine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3012388A (en) * | 1958-10-23 | 1961-12-12 | Anchor Hocking Glass Corp | Means for sealing threaded-type containers |
GB9306521D0 (en) * | 1993-03-29 | 1993-05-19 | Gei Filling Capping And Labell | A capping machine |
US6023910A (en) * | 1998-08-28 | 2000-02-15 | Inline Filling Systems, Inc. | Capping machine |
US7325369B2 (en) * | 2006-02-21 | 2008-02-05 | Luc Jalbert | Apparatus including a differential for rotating a cap relatively to a container |
-
2015
- 2015-07-01 EP EP15174824.1A patent/EP3112275B1/en not_active Not-in-force
-
2016
- 2016-06-21 WO PCT/EP2016/064276 patent/WO2017001238A1/en active Application Filing
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
EP3112275A1 (en) | 2017-01-04 |
WO2017001238A1 (en) | 2017-01-05 |
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