EP2404863A1 - Tête de fermeture - Google Patents

Tête de fermeture Download PDF

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Publication number
EP2404863A1
EP2404863A1 EP10405241A EP10405241A EP2404863A1 EP 2404863 A1 EP2404863 A1 EP 2404863A1 EP 10405241 A EP10405241 A EP 10405241A EP 10405241 A EP10405241 A EP 10405241A EP 2404863 A1 EP2404863 A1 EP 2404863A1
Authority
EP
European Patent Office
Prior art keywords
shaft
head according
closing head
rotation
closing
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.)
Withdrawn
Application number
EP10405241A
Other languages
German (de)
English (en)
Inventor
Ponert Lutz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amax Automation AG
Original Assignee
Amax Automation AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Amax Automation AG filed Critical Amax Automation AG
Priority to EP10405241A priority Critical patent/EP2404863A1/fr
Publication of EP2404863A1 publication Critical patent/EP2404863A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B67B3/20—Closing bottles, jars or similar containers by applying caps by applying and rotating preformed threaded caps
    • B67B3/2073—Closing bottles, jars or similar containers by applying caps by applying and rotating preformed threaded caps comprising torque limiting means
    • 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

Definitions

  • the invention relates to a closure head for closing containers with a rotary closure, comprising a first shaft which is rotatable about a motor about a rotation axis of the shaft and a second shaft which is rotatable about the rotation axis and coaxial with the first shaft, wherein the second shaft is connected to a gripper for gripping the rotary closure, wherein the first shaft is connected via a resilient element with the second shaft so that a torque from the first shaft via the resilient member to the second shaft is transferable. Furthermore, the invention relates to a method for closing containers using the inventive closure head.
  • the US 4,232,499 A (John H. Holstein ) relates to a device for closing containers with screw caps, wherein the shutter is released in response to a predetermined torque.
  • a sleeve and a torque controlled plate are rotatably connected via the shaft and coupled via a torsion spring for transmitting the torque.
  • the torque can thus be adjusted via a bias of the torsion spring.
  • the fingers After reaching the set torque, the fingers are mechanically actuated radially outward, so that the lid is released.
  • the DE 698 17 069 T2 (ACMASpA) relates to a device for screwing a cap on a container neck, comprising a number of gripping means, whereby the cap is held until it is screwed onto the container. Once the cap is screwed on, the clutch will begin to slip when a set torque limit is exceeded.
  • the object of the invention is to provide a closure head belonging to the technical field mentioned at the outset, which is simple in construction, can be precisely controlled and used variably, and to provide a corresponding method for closing containers with a rotary closure.
  • the closing head comprises a sensor device with which a rotation of the second shaft with respect to the first shaft about the axis of rotation can be detected.
  • the inventive design of the capping head has the advantage that it can be easily adapted to different screw caps and container types by setting a desired maximum torque value and controlled by the sensor device.
  • An adaptation to a new Verschliesskopf can thus be made in a defined by the resilient element range of torques without changing the structure of the Verschliesskopfes, with which the adaptations can be done quickly and easily.
  • a course of the closure can be controlled, wherein, for example, a rotational speed is adapted to the instantaneous torque.
  • the closure head according to the invention is largely robust against temperature fluctuations and contamination.
  • the rotary closure may comprise a thread, but also be designed as a bayonet closure and the like.
  • the requirement for the rotary closure is merely that it can be applied by rotation to a container.
  • the skilled person is also known for this purpose other closures, which can be screwed by means of the inventive device.
  • the screw caps may further include a metering device, such as a trigger pump.
  • the first shaft is driven by a motor during closing.
  • the motor is preferably designed as an AC servo motor.
  • the AC servomotor has the advantage that relatively high circulation rates can be achieved with high smoothness.
  • can Precise control of the rotation of the spindle can be achieved by means of the AC servo motor.
  • Other motors such as a stepper motor, may be provided. But this has the disadvantages that it is slower compared to the AC servo motor and also results in larger numbers of trips a larger noise emission. Depending on the application, these disadvantages can also be accepted.
  • the motor is preferably operable with a precision which allows a rotary closure to be placed in a specific position.
  • dispensers comprising a beak for dispensing a product, such as soap, hand cream, disinfectant, etc.
  • a product such as soap, hand cream, disinfectant, etc.
  • the transmission of the torque from the motor to the first shaft can take place, for example, via a belt, in particular via a toothed belt.
  • a chain drive, a gear transmission and the like is conceivable.
  • the second shaft is arranged coaxially with the first shaft and is supported independently of the first shaft.
  • the second shaft comprises the gripper, which is preferably designed as a jaw gripper.
  • the gripper may for example comprise two, three or four jaws for gripping the screw caps, wherein more than four jaws may be provided. It is also conceivable to provide exactly a pivotable jaw, if static holding elements are provided on the second shaft, wherein the rotary closure between the one jaw and the static holding elements can be maintained.
  • the grippers can be actuated via a spreader, which comprises a pneumatically actuated piston rod, which is mounted axially movable within the first and second shafts designed as hollow shafts.
  • the gripper may instead of the jaws, or in addition to the support of the jaws, have a sucker, which can hold the screw cap by means of negative pressure.
  • the skilled person is also known other suitable gripping means for gripping a rotary closure.
  • the gripping device is designed interchangeable, so that it can be adapted to the respective rotary fasteners.
  • the second shaft is also preferably formed axially movable. This ensures that the capping head can be used for different height containers as well as for different screw caps.
  • the capping head preferably comprises a servo-drive motor for carrying out the stroke.
  • the axial mobility of the second shaft with the gripper is particularly advantageous when trigger pumps are screwed. These typically include a dip tube which must be passed through the mouth of the container prior to closure.
  • the capping head can be adapted to different container types with little effort by merely adjusting the control of the stroke of the second shaft.
  • the resilient element is designed as a leg spring.
  • the leg spring has one or more windings and can be connected directly or indirectly via the two ends to the first and the second shaft respectively.
  • the ends may be bent radially or axially.
  • the windings may be arranged circumferentially around the shaft and be spaced from the shaft, for example in a relaxed state, or in a prestressed rest state (see below), so that the turns can contract when the spring is tensioned.
  • a friction between the shaft and the leg spring can be kept low, whereby a torque with higher precision can be detected.
  • the windings can rest on a shaft, in which case the leg spring is used as a tension spring.
  • the leg spring is formed so that the spring force is largely linear with the compression or extension.
  • the sensor can also be calibrated according to several points so that a leg spring can be used which does not ideally follow Hook's law.
  • the leg spring is selected so that the torque can be adjusted in a range of 0.1 to 2 Nm.
  • torque ranges may be provided depending on the field of application.
  • another resilient element may be provided.
  • suitable spring types or resilient materials are known to those skilled in the art.
  • a spiral spring can be arranged circumferentially around a shaft. However, this would be pressed under tension to the shaft, with which they deform can and with what it would be subjected to a higher friction. This in turn could affect the measurements of the torque, or distort it. Depending on the accuracy requirements, these disadvantages could also be accepted.
  • the sensor device comprises an element and a sensor with which a position of the element can be detected.
  • the element may be fixedly arranged with respect to the first or the second shaft, or be formed as a separate body, which may be movably guided by the first or the second shaft in a predetermined path.
  • the sensor device can be constructed particularly simple and robust. Furthermore, there is thus the possibility of forming the sensor device without contact, thus creating a sensor device which itself causes no or only slight friction losses, which in turn allows a more accurate measurement of the torque to be achieved.
  • the element may also be dispensed with, in particular if instead, for example, a fixedly arranged and defined region with respect to the first or the second shaft is designed to detect the rotation of the second shaft with respect to the first shaft.
  • a fixedly arranged and defined region with respect to the first or the second shaft is designed to detect the rotation of the second shaft with respect to the first shaft.
  • This can be achieved, for example, by means of a perforation or toothing running around a shaft, wherein the sensor can be designed as a toothed wheel.
  • the relative rotation of the two waves can be determined via a rotation of the gear.
  • the element is preferably guided off-center to the axis of rotation movable in a first groove.
  • For measuring the torque only the position of the element in the groove is now determined by means of the sensor.
  • the accuracy of the measurement can be optimized against the radial dimensions of the sensor device. This design allows the element to be guided on a non-circular path, thus creating a large design margin for the sensor device.
  • the element may also be fixed relative to the first or second shaft. In this case, however, the element would inevitably make a circular motion.
  • the first groove is aligned in a straight line.
  • the groove has the direction and length of a chord of a circle centered on the axis of rotation.
  • the straight-line design of the groove has the advantage that commercially available sensors can be used.
  • the element is subjected to a smaller friction by the linear method than if it had to be guided in a curve. This allows a more accurate measurement of the torque, since the friction can affect the measured resistance of the resilient element.
  • the groove may also be curved, in particular have the shape of a circular arc piece.
  • the closing head comprises a link element, in which the first groove is arranged.
  • the link element may be formed as a separate element, which is connectable to the first or the second shaft.
  • the groove can be inserted directly into one of the two shafts and be designed, for example, revolving around the shaft.
  • the link element is preferably non-rotatably connected to the first shaft.
  • the gate element is arranged above the control element, wherein the element is guided on a support, i. not in the first groove rests.
  • the link element can also be connected to the second shaft.
  • the capping head comprises a control member rotatably connected to the second shaft, the control member comprising a radially oriented second groove formed and arranged such that the member is in an overlapping region of the first and second grooves through the first and second grooves is guided.
  • the second shaft is preferably connected via a leaving flange of the control with the latter.
  • the two shafts are connected to each other via the resilient element.
  • a rotation of the first shaft now causes a torque on the link element, which in turn leads the element in the first groove.
  • the torque increases continuously, so that the resilient element, for example, from a limit torque, the length changes and at the same time by the control element is moved in the first groove.
  • the sensor determines the position of the element in each case and can end the closing process after reaching a predetermined position which corresponds to a maximum permissible torque.
  • To open the gripper which relaxes the resilient element and, either exclusively by means of the spring force or additionally controlled by the engine, can turn back to its original position.
  • the torque from the gate element via the resilient element to the control is transferable.
  • the sensor unit comprising the control element, the element, the link element and the resilient element may be formed as an independent unit.
  • the link element with the second shaft and the control can be connected to the first shaft.
  • the torque can also be transmitted from the control via the resilient element to the link element, in which case the first shaft would be connected to the control element and the second shaft would be connected to the link element.
  • the resilient element is biased in a resting state with a biasing force.
  • the resilient element of the closing head can be used in a corresponding torque range.
  • the bias of the resilient member is in a range below the maximum torque to be applied all provided for use screw caps.
  • the resilient element can be further selected so that either a high accuracy or a large range of torque can be achieved. This ensures that the resilient element can be used for a variety of different screw caps.
  • a suitable resilient element can be determined by the person skilled in the art.
  • a resilient element In variants can be dispensed with the bias of the resilient element. Accordingly, a resilient element must be provided with a larger spring constant, whereby the precision of the torque to be adjusted decreases.
  • a force acting on the resilient element during the closing of the container is greater than or equal to the biasing force. This ensures that in each case the torque acting on the rotary closure of the container can be controlled.
  • the closing head can also be designed such that the torque measuring device does not respond during a normal closing process, but only when the torque exceeds a normal range.
  • the senor is arranged along the first groove. This ensures that each position of the element along the first groove can be detected, which in particular a precise control of the torque is made possible.
  • the senor may also be provided only at discrete locations, whereby the torque can be detected only discreetly.
  • the control and the link element are preferably disc-shaped.
  • the link element is preferably designed as a crank disc, which eccentrically comprises the first groove. It is clear to the person skilled in the art that a substantially triangular or circular segment-shaped element can also be used. However, it is an advantage that Circular element form circular, especially if there is a risk that parts can enter the area of the rotating link element and thereby affect the function of the closing head. Another advantage of the circular shape is that the focus is essentially in the center of the link plate. This can, especially at high speeds, an imbalance kept low and thus a robust closing head can be achieved, which has a high smoothness.
  • control is, according to the above reason, also preferably disk-shaped designed as a control disk, it being understood by those skilled in the art that also differently shaped controls, such as a fork, can be used.
  • the element is designed as a permanent magnet and the sensor as an inductive sensor.
  • the sensor as an inductive sensor.
  • the motor is controllable via the sensor. This ensures that the motor can be controlled depending on the position of the second shaft to the first wave. As soon as the sensor has detected the specified maximum value of the torque, the motor can be stopped and thus the closing process can be ended. In addition, this results in the possibility, for example, to control the rotational speed of the motor as a function of the instantaneous torque, in particular to reduce the rotational speed as the torque increases.
  • the resilient element is designed replaceable. This ensures that in a product class change from low to low torque high-torque screw caps, or vice versa, in a simple and cost-effective manner, the capping head can be adjusted.
  • the entire sensor device can be made interchangeable.
  • a method for closing containers with screw cap using a Verschliesskopfes with a first shaft which is rotatable about a rotation axis of the shaft by means of a motor and a second shaft which is rotatable about the axis of rotation and coaxial with the first shaft, wherein the second shaft is connected to a gripper for engaging the rotary closure, wherein the first shaft is connected via a resilient element with the second shaft so that a torque from the first shaft via the resilient member to the second shaft is transferable, wherein with a sensor device a rotation of the second shaft is detected with respect to the first shaft about the axis of rotation.
  • the method can also comprise further steps, in particular in the utilization of the signals detected by the sensor device.
  • the rotary closure and / or the container Before placing the rotary closure on the container, the rotary closure and / or the container can be rotated to the desired position. This is particularly advantageous in liquid dispensers in which a beak for dispensing the liquid after screwing must have a certain orientation. If the rotary closure comprises a dip tube, this is passed through a correspondingly long stroke through the opening into the container.
  • FIG. 1a shows a plan view of a control disk 10 of the inventive sensor device 1 of the capping head.
  • the control disk 10 is formed substantially as a circular disk and comprises a bearing flange 12 which is coaxial with Circular disc is arranged.
  • a radially oriented groove 13 is formed, which breaks through the control disk 10.
  • FIG. 1b shows a sectional view of the control disk 10 along the line AA of FIG. 1a , Subsequently to and coaxial with the bearing flange 12, a leaving flange 11 is arranged, which is connected to a gripper, not shown.
  • FIG. 2a shows a plan view of a link plate 20, which in turn is substantially formed as a circular disk.
  • the link plate comprises an axially oriented circumferential flange 23, which has a greater axial height than the outer edge of the control disk 10 and an inner diameter in the range of the diameter of the control disk 10, so that the control disk 10 can be received in the link disk 20 ( see below).
  • the link plate 20 further comprises a guide groove 21, which is arranged eccentrically to the link plate 20 and on the same side as the flange 23.
  • the guide groove 21 is formed as a recess in the link plate 20.
  • Within the guide groove 21 is an opening 22 can be seen, which has substantially the shape of the guide groove 21, but is about half as wide and shorter by about the same length.
  • the opening 22 is arranged symmetrically in the guide groove 21.
  • the link plate 20 comprises a coaxially oriented control disk bearing 24, in which the bearing flange 12 of the control disk 10 is received.
  • FIG. 2b shows a sectional view taken along the line AA of FIG. 2a through a link disc 20 and shows the features described above.
  • a drive shaft is connected to the link plate 20.
  • FIG. 3 shows a sectional view along the lines according to the FIGS. 1a and 2a a sensor device 1, comprising a control disk 10, which is arranged within the link disk 20.
  • the control disk 10 is mounted via a not explicitly shown control disk bearing 24.
  • the radial groove 13 and the guide groove 21 form an overlap region, in which a permanent magnet 40 is arranged.
  • an inductive sensor 50 is arranged along the entire length of the guide groove 21. By means of the inductive sensor 50, the position of the Permanent magnet 40 determined.
  • the flange 23 of the link plate is connected to a cover 30 which is formed as a circular disc with a coaxial opening, wherein the outlet flange protrudes through the opening.
  • a leg spring 60 is arranged around the outlet flange 11, which is connected at one end to the lid 30 and at the other end to the outlet flange 11.
  • the link plate 20 is now set in rotation, the gripper, which holds a screw cap, provides a resistance.
  • the permanent magnet 40 is due to the bias on a stop in the guide groove 21.
  • the control disk 10 which is connected to the gripper is.
  • the permanent magnet is guided away from the stop by the radial groove 13 of the control disk 10 in the guide groove 21, wherein the distance to the stop in relation (for example, linear) to, executed on the screw cap, torque.
  • the inductive sensor 50 detects the position of the permanent magnet 50 and transmits the data to a computing unit. This compares the measured value with a predetermined maximum value.
  • the motor If the maximum value is reached or exceeded, the motor is stopped, whereupon the gripping device releases the screw cap and the control disc 10 by means of the stored energy of the leg spring 60 back to the rest position.
  • the motor can control the turning back of the gripping device to the rest position.
  • the control disk 10 has an opening 14 for passing a piston rod with a spreader for actuating the gripping device (not shown). Further, through the opening 14, in particular by a piston rod designed as a hollow shaft, lines can be guided, which are connected, for example, to a capacitive sensor which can check for the presence of a closure.
  • the control disk bearing 24 comprises a ball or a roller bearing, the skilled person also other embodiments of a bearing are known, which can be used in the present sensor device 1.
  • a closure head with a sensor device which can be adapted in a simple manner to different screw caps in which only a maximum torque value is electronically predetermined.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Of Jars (AREA)
EP10405241A 2010-12-20 2010-12-20 Tête de fermeture Withdrawn EP2404863A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10405241A EP2404863A1 (fr) 2010-12-20 2010-12-20 Tête de fermeture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10405241A EP2404863A1 (fr) 2010-12-20 2010-12-20 Tête de fermeture

Publications (1)

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EP2404863A1 true EP2404863A1 (fr) 2012-01-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107598942A (zh) * 2017-10-20 2018-01-19 广东伯朗特智能装备股份有限公司 一种自动伸缩喷涂型工业机器人及控制方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232499A (en) 1978-08-01 1980-11-11 John H. Holstein Capper chuck
US20030196519A1 (en) * 2002-04-22 2003-10-23 Serac Group Device for screwing on caps
DE69817069T2 (de) 1997-05-06 2004-06-09 Azionaria Costruzioni Macchine Automatiche A.C.M.A. S.P.A. Vorrichtung zum Aufschrauben einer Kappe auf einem Behälterhals
WO2007028509A1 (fr) * 2005-09-09 2007-03-15 Alcoa Deutschland Gmbh Dispositif de fermeture pour mettre en place des bouchons a vis sur des recipients

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232499A (en) 1978-08-01 1980-11-11 John H. Holstein Capper chuck
DE69817069T2 (de) 1997-05-06 2004-06-09 Azionaria Costruzioni Macchine Automatiche A.C.M.A. S.P.A. Vorrichtung zum Aufschrauben einer Kappe auf einem Behälterhals
US20030196519A1 (en) * 2002-04-22 2003-10-23 Serac Group Device for screwing on caps
WO2007028509A1 (fr) * 2005-09-09 2007-03-15 Alcoa Deutschland Gmbh Dispositif de fermeture pour mettre en place des bouchons a vis sur des recipients

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107598942A (zh) * 2017-10-20 2018-01-19 广东伯朗特智能装备股份有限公司 一种自动伸缩喷涂型工业机器人及控制方法

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