EP0100836B1 - Device for tensioning a bundling strap applied around a package - Google Patents

Device for tensioning a bundling strap applied around a package Download PDF

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Publication number
EP0100836B1
EP0100836B1 EP83105760A EP83105760A EP0100836B1 EP 0100836 B1 EP0100836 B1 EP 0100836B1 EP 83105760 A EP83105760 A EP 83105760A EP 83105760 A EP83105760 A EP 83105760A EP 0100836 B1 EP0100836 B1 EP 0100836B1
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EP
European Patent Office
Prior art keywords
lever
tensioning
wheel
stage
gear
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.)
Expired
Application number
EP83105760A
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German (de)
French (fr)
Other versions
EP0100836A3 (en
EP0100836A2 (en
Inventor
Gerd Bartzick
Gerd Bühne
Jürgen Ing. grad. Werk
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.)
Hoesch AG
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Hoesch AG
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Filing date
Publication date
Application filed by Hoesch AG filed Critical Hoesch AG
Publication of EP0100836A2 publication Critical patent/EP0100836A2/en
Publication of EP0100836A3 publication Critical patent/EP0100836A3/en
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Publication of EP0100836B1 publication Critical patent/EP0100836B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • B65B13/00—Bundling articles
    • B65B13/18—Details of, or auxiliary devices used in, bundling machines or bundling tools
    • B65B13/24—Securing ends of binding material
    • B65B13/34—Securing ends of binding material by applying separate securing members, e.g. deformable clips
    • B65B13/345—Hand tools

Definitions

  • the invention relates to a device for tensioning a strapping that can be pulled off a supply roll and placed around a package, and for connecting the overlapping ends of the strapping with a closure and for separating the part of the strapping that leads to the supply roll, which consists of a housing, for the tensioned strapping with a base plate to be placed on the package, which has the lower tool for the formation of the closure, while the upper tool for the formation of the closure is arranged vertically displaceably in the housing and can be moved into the active position by a motor drive, and the housing for a lateral insertion of the overlapping band ends has a slot-shaped receptacle between the two tools above the base plate and is provided with a tensioning device which acts on the upper side of the overlapping band ends and with a motor drive in the tensioning direction
  • Tensionable wheel the motor drive of the upper tool for the closure formation and the motor drive for the tensioning wheel is formed by a single drive motor, which in its one direction of rotation first reverses the tensioning wheel for
  • the overlapping band ends are pressed with a pressure plate against the tensioning wheel of the tensioning device, the pressure plate being provided on a pivot lever which is spring-loaded in the pressure direction.
  • the pivot lever is mounted in such a way that when the tensioning device is used as intended, i.e. when the tensioning wheel is turned, it presses the pressure plate even more firmly against the overlapping band ends, the pivoting lever performing a pivoting movement.
  • This pivoting movement of the pivot lever is used to actuate the switch.
  • the switch is held on the pivot lever and interacts with an adjustable stop which is provided on the housing.
  • the pressure plate and thus the swivel lever is pivoted in the direction of the tensioning wheel until the switch with the adjustable stop causes the switch to be switched off and thus the drive motor for the tensioning wheel is suspended.
  • the drive motor for the tensioning wheel is therefore switched off depending on how far the pivoting lever has been pivoted and the pressure plate has been pressed against the tensioning wheel.
  • the overlapping ends of the strapping are arranged between the pressure plate and the tensioning wheel, so that tolerances in the thickness of the strapping influence the tension that can be achieved in the strapping.
  • the tensioning wheel and the pressure plate are provided with a cord which is pressed into the overlapping band ends when the pressure plate is pressed in the direction of the tensioning wheel. Differences in the strength of the strapping, which opposes the pressing of the cord into the strapping, also influences the tension that can be achieved in the strapping. In the known device, repeated reaching of a predetermined tension in the strapping band is therefore not possible.
  • the invention has for its object to provide a device of the type mentioned, in which such disadvantages are avoided and with which a precisely adjustable tension in the strapping is achieved repeatedly.
  • the changeover switch consists of a lever which can be locked from a basic position counter to the action of an energy accumulator and which acts via an adjusting screw on a spring-loaded shift lever, the pivot lever acting on the shift lever being actuatable with the reaction force of the drive. It is thereby achieved in a simple manner that the strap tension can be brought exactly to the desired value, since the reaction force of the drive increases with the action force of the drive for rotating the drive wheel with the increasing strap tension in the strapping strap and the changeover switch can be set in such a way that the drive is switched off at the point in time at which the desired belt tension is reached.
  • the pivoting lever acting on the shift lever can be designed as a two-armed lever and mounted on an axis and the reaction force of the drive can act on the one lever arm, while the force accumulator directed against the reaction force and the shift lever act on the second lever arm. It is thereby achieved in a simple manner that the two-arm pivot lever engages the drive with its one lever arm and is acted upon by the reaction force, while a force accumulator acts on the second lever arm, which counteracts the pivoting of the pivot lever, so that only for pivoting the pivot lever the force of the energy accumulator must be overcome before switching the drive motor is possible with the shift lever.
  • the energy accumulator can be formed by a tension spring acting on the free end of the second lever arm of the swivel lever. With this tension spring forming the energy store, the pivot lever is held in the basic position in a simple manner and counteracts the pivoting a certain force.
  • the shift lever can be designed as a two-armed lever and also on the axis of the Be pivotally mounted pivoting lever and have the adjusting screw on its one lever arm in a lateral widening spanning the pivoting lever.
  • the shift lever and the pivot lever are mounted on a common axis in a simple manner, the shift lever having the adjusting screw on its one lever arm in a lateral widening that extends over the pivot lever.
  • the lever arm of the shift lever which has the adjusting screw, can have an opening for the articulation of a helical tension spring at its free end.
  • the shift lever thus also has a coil tension spring which holds it in its basic position and opposes the pivoting resistance.
  • the second lever arm In its basic position, the second lever arm can protrude in the movement path of a spring-loaded changeover valve for the drive motor that can be operated with compressed air and runs parallel to the pivot axis of the shift lever and, after pivoting into the active position, release the movement path for the spring-actuated switching of the valve.
  • the device is thus driven in a simple manner with a motor operated by compressed air, and the switchover takes place via a switchover valve, the switch lever releasing the spring-loaded switchover valve after it has been brought into the switch position, so that it is shifted into the switchover position under the action of the associated spring .
  • the motor which can be driven with compressed air in both directions of rotation, can be assigned a multi-stage, preferably three-stage planetary gear, each with a sun gear, planet gears and planet gear carriers and internally toothed gear, the motor being the sun gear of the first gear stage and the planet gear carrier of the first stage being the sun gear of the second stage and Planet gear carrier of the second stage the sun gear of the third stage and the planet gear carrier of the third stage in one direction of rotation the tensioning wheel for tensioning the strapping and in the opposite direction of rotation actuated the tool for the closure formation.
  • this three-stage planetary gear the speed of the motor operated with compressed air is reduced, with a corresponding increase in torque.
  • the drive motor operated by compressed air the required torque for tensioning the strapping and for inserting the closure can thus be achieved in a simple manner.
  • the pivoting lever acting on the shift lever can be operatively connected with its first lever arm to the internally toothed gear of the first gear stage, which is rotatably mounted in the gear housing.
  • a reaction force arises on the internally toothed gear of the first gear stage, which increases with the corresponding action force of the gear.
  • the internally toothed gear is rotatably mounted in the housing and interacts with the spring-loaded pivot lever, so that the pivot lever is pivoted by the internally toothed gear against the action of the associated energy accumulator and thus the changeover is effected.
  • the torque is still relatively small, so that the reaction force is also small.
  • a relatively small energy store can thus be assigned to the pivot lever for the switchover.
  • the switching time can be set precisely.
  • the internally toothed gear wheel which is rotatably mounted in the gear housing, can have a recess in the outer lateral surface for the first lever arm of the spring-loaded pivot lever.
  • the swivel lever engages in this recess with its one lever arm and is swiveled when the internally toothed gear is turned.
  • a pressure relief valve can be assigned to the drive motor operated with compressed air in the compressed air line. Overloading of the motor is thus avoided in a simple manner.
  • the device shown in the drawing is used for tensioning a strapping placed around a package (not shown) and also not shown and for connecting the overlapping ends of the strapping with a sleeve-less closure.
  • the device consists of a housing 10 with a base plate 11 which can be placed on the package and which has the lower tool for the closure formation, while the upper tool for the closure formation is arranged vertically displaceably in the housing 10.
  • the upper tool for the closure formation in the housing 10 is displaced with an eccentric, not shown, which is held on a shaft 12.
  • the shaft 12 is driven in a manner yet to be described with a motor 13 which is driven with compressed air.
  • the housing 10 has a slot-shaped receptacle 14 for the lateral insertion of the overlapping band ends between the two tools for forming the closure over the base plate 11. Furthermore, the housing 10 is provided in a recess 15 with a pivotably mounted tensioning device 16, which is biased towards the base plate 11 with a spring, not shown.
  • the clamping device 16 is around the bearing pin 17th pivotable and has a tensioning wheel 18 acting on the upper side of the overlapping band ends.
  • the tensioning wheel 18 is also driven in a manner to be described, also with the motor 13, which is driven with compressed air.
  • the pivoting about the bearing pin 17 clamping device 16 is provided with a hand lever 19 with which the clamping device 16 from the basic position shown in FIG. 1, in which the tensioning wheel 18 bears against the base plate 11, against the action of the spring not shown in FIG the tape insertion position is transferable.
  • the tensioning wheel 18 of the tensioning device 16 is arranged at such a distance from the base plate 11 that the overlapping strap ends of the strapping strap can be inserted under the tensioning wheel 18 without difficulty.
  • the device shown in the drawing is used for tensioning a strapping that can be pulled off a storage roll (not shown) and placed around a package, and for connecting the overlapping ends of the strapping with a sleeve-less closure and for separating the part of the strapping that is not shown for the strapping Supply roll of leading strapping tape.
  • the separating device consists of a notch knife, not shown, which is provided on the upper tool for the formation of the closure.
  • the compressed air motor 13 is accommodated with a downstream reduction gear 20 in a special housing 21 which is placed on the housing 10.
  • a hand lever 22 is arranged on the housing 21 and is provided above the hand lever 19 in the tensioning device 16. The operator can thus grasp and compress both hand levers 19 and 22 so that the tensioning device 16 can be transferred to the tape insertion position.
  • the compressed air motor is accommodated in parallel in the housing 21 next to the reduction gear 20, so that a compact design is achieved.
  • the axis of rotation 23 of the compressed air motor 13 runs parallel to the axis of rotation 24 of the reduction gear 20 and also parallel to the axis of rotation 25 of the tensioning wheel 18 and parallel to the shaft 12 of the upper tool for the closure formation.
  • the rotary movement of the compressed air motor 13 can thus be transmitted in a simple manner via spur gears.
  • a pinion 26 is provided, which is connected to an intermediate gear 27, with a gear 28 which is arranged in a rotationally fixed manner on the axis of rotation 24 of the reduction gear 20.
  • the reduction gear consists of a three-stage planetary gear, each stage each having a sun gear, planet gears, a planet carrier and an internally toothed gear in a manner not shown.
  • the axis of rotation 24 driven by the compressed air motor 13 actuates the sun gear of the first gear stage and the planet gear carrier of the first stage the sun gear of the second stage and the planet gear carrier of the second stage the sun gear of the third stage and the planet gear carrier of the third stage a rotational axis 29 on which a gear wheel 30 is put on.
  • the gear 30 acts, as can be seen in particular from FIG. 3, via an intermediate gear 31 on a gear 32 which is arranged with a one-way clutch 33 on the shaft 12 of the upper tool for the closure formation.
  • a second intermediate wheel 34 which is rotatably mounted on the bearing pin 17 of the tensioning device, also acts on the intermediate wheel 31.
  • the intermediate gear 34 meshes with a gear 35, which is placed on the axis of rotation 25 of the tensioning wheel 18 via a one-way clutch 36.
  • the strapping When used as intended, the strapping must first be tensioned. that is, to drive the tensioning wheel 18 with the compressed air motor 13 before the sleeveless closure is to be introduced into the overlapping band ends.
  • the air motor 13, which is switchable is driven in one direction of rotation.
  • the gear 32 which is fitted on the shaft 12 with the one-way clutch 33 is driven.
  • the gear 32 is rotated in the direction that the shaft 12 for the upper tool for the closure formation is not rotated via the one-way clutch 33.
  • the compressed air motor 13 is switched over in a manner to be described, so that it now rotates in the opposite direction.
  • the shaft 12 of the upper tool for the closure formation is now carried along by the gear 32 via the one-way clutch 33.
  • the gear 35 which is assigned to the tensioning wheel 18, is also rotated, but the axis of rotation 25 of the tensioning wheel 18 is not rotated via the one-way clutch 36.
  • the axis of rotation 25 of the tensioning wheel 18 can be assigned a further one-way clutch, not shown in detail, which prevents the tensioning wheel 18 from being turned back unintentionally.
  • the switchover device is shown in more detail in FIGS. 4 and 5.
  • the switch 37 consists of a two-armed angle lever 38 which is pivotally mounted on an axis 39.
  • the shorter lever arm 40 of the angle lever 38 is in a manner to be described by the reaction force of the reduction gear bes acted upon 20, while a helical tension spring 42 is articulated on the longer lever arm 41 of the angle lever 38.
  • a pivoting of the angle lever 38 from the basic position shown in FIG. 4 into the switching position thus takes place counter to the action of the tension spring 42.
  • the lever arm 41 of the angle lever 38 acts via an adjusting screw 43 on a switching lever 44 which is also pivotably mounted on the axis 39 is.
  • the shift lever 44 has a lever arm 45 which runs parallel to the lever arm 41 of the angle lever and which is provided with a widening 46 which overlaps the angle lever. In the widening 46, the adjusting screw 43 is drawn into a threaded bore, not shown.
  • a helical tension spring 47 is also articulated, so that the shift lever 44 is pivoted from the basic position shown in solid lines in FIG. 4 into the shift position shown in dashed lines against the action of the tension spring 47 .
  • the second lever arm 48 of the switching lever 44 protrudes in the movement path of a spring-loaded changeover valve 49 for the compressed air motor 13 which runs parallel to the pivot axis 39 of the switching lever 44 and, after it has pivoted into the switching position, releases the movement path for the spring-actuated switching of the valve 49.
  • the piston 50 of the changeover valve 49 is under the action of a helical compression spring 51 which shifts the piston 50 into the changeover position.
  • the switch 37 is actuated with the reaction force of the drive.
  • the internally toothed gear 52 of the first gear stage which is rotatably mounted in the gear housing 21, has a recess 54 in the outer lateral surface 53 for the first lever arm 40 of the angular swivel lever 38.
  • a pressure relief valve 56 can be provided in the compressed air line 55.
  • This pressure relief valve has a valve ball 57, which is under the action of a helical compression spring 58, an adjustable screw 59 abutting against the rear end of the helical compression spring 58, with which the pretension of the helical compression spring 58 can be adjusted.
  • the valve ball 57 is pressed with the helical compression spring 58 against a valve seat 60 and thus closes off the compressed air line 55.
  • the valve ball 57 is raised against the action of the helical compression spring 58 from the valve seat 60, so that the compressed air can flow out through the line 61.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Spannen eines von einer Vorratsrolle abziehbaren und um ein Packstück gelegten Umreifungsbandes und zum Verbinden der sich überlappenden Enden des Umreifungsbandes mit einem Verschluss und zum Abtrennen des für die gespannte Umreifung überschüssigen Teiles des zur Vorratsrolle führenden Umreifungsbandes, bestehend aus einem Gehäuse mit einer auf das Packstück aufzusetzenden Grundplatte, die das untere Werkzeug für die Verschlussbildung aufweist, während das obere Werkzeug für die Verschlussbildung senkrecht verschiebbar im Gehäuse angeordnet und mit einem motorischen Antrieb in die Wirkstellung überführbar ist und das Gehäuse für ein seitliches Einführen der sich überlappenden Bandenden zwischen die beiden Werkzeuge über der Grundplatte eine schlitzförmige Aufnahme aufweist und mit einer Spanneinrichtung versehen ist, die ein auf die Oberseite der sich überlappenden Bandenden einwirkendes und mit einem motorischen Antrieb in Spannrichtung drehbares Spannrad aufweist, wobei der motorische Antrieb des oberen Werkzeuges für die Verschlussbildung und der motorische Antrieb für das Spannrad von einem einzigen Antriebsmotor gebildet ist, der in seiner einen Drehrichtung zunächst das Spannrad zum Spannen des Umreifungsbandes und nach einem bandspannungsabhängigen Betätigen eines Umschalters die Drehrichtung umkehrt und das Werkzeug für die Verschlussbildung betätigt.The invention relates to a device for tensioning a strapping that can be pulled off a supply roll and placed around a package, and for connecting the overlapping ends of the strapping with a closure and for separating the part of the strapping that leads to the supply roll, which consists of a housing, for the tensioned strapping with a base plate to be placed on the package, which has the lower tool for the formation of the closure, while the upper tool for the formation of the closure is arranged vertically displaceably in the housing and can be moved into the active position by a motor drive, and the housing for a lateral insertion of the overlapping band ends has a slot-shaped receptacle between the two tools above the base plate and is provided with a tensioning device which acts on the upper side of the overlapping band ends and with a motor drive in the tensioning direction Tensionable wheel, the motor drive of the upper tool for the closure formation and the motor drive for the tensioning wheel is formed by a single drive motor, which in its one direction of rotation first reverses the tensioning wheel for tensioning the strapping and after a strap-dependent actuation of a switch, the direction of rotation and actuated the closure formation tool.

Bei dieser bekannten Vorrichtung werden die sich überlappenden Bandenden mit einer Andrückplatte gegen das Spannrad der Spannvorrichtung gedrückt, wobei die Andrückplatte an einen in Andrückrichtung federbelasteten Schwenkhebel vorgesehen ist. Mit diesem federbelasteten Hebel wird somit die Andrückplatte und damit die sich überlappenden Bandenden gegen das Spannrad gedrückt. Der Schwenkhebel ist dabei derart gelagert, dass bei bestimmungsgemässen Gebrauch der Spannvorrichtung, d.h. beim Drehen des Spannrades die Andrückplatte noch fester gegen die sich überlappenden Bandenden drückt, wobei der Schwenkhebel eine Schwenkbewegung durchführt. Diese Schwenkbewegung des Schwenkhebels wird zum Betätigen des Umschalters ausgenutzt. Der Umschalter ist dabei an dem Schwenkhebel gehaltert und wirkt mit einem verstellbaren Anschlag zusammen, der am Gehäuse vorgesehen ist. Beim bestimmungsgemässen Gebrauch der Spannvorrichtung wird die Andrückplatte und damit der Schwenkhebel in Richtung auf das Spannrad verschwenkt, bis der Schalter mit dem einstellbaren Anschlag ein Ausschalten des Schalters bewirkt und somit den Antriebsmotor für das Spannrad aussetzt. Das Ausschalten des Antriebsmotors für das Spannrad erfolgt somit in Abhängigkeit davon, wie weit der Schwenkhebel verschwenkt und die Andrückplatte gegen das Spannrad gedrückt worden ist. Zwischen der Andrückplatte und dem Spannrad sind jedoch die sich überlappenden Enden des Umreifungsbandes angeordnet, so dass Toleranzen in der Dicke des Umreifungsbandes Einflüsse auf die erzielbare Spannung im Umreifungsband hervorrufen. Ausserdem ist das Spannrad und die Andrückplatte mit einer Kordierung versehen, die sich beim Andrücken der Andrückplatte in Richtung auf das Spannrad in die sich überlappenden Bandenden eindrücken. Unterschiede in der Festigkeit des Umreifungsbandes, die dem Eindrücken der Kordierung in das Umreifungsband entgegen steht, beeinflusst ebenfalls die erzielbare Spannung im Umreifungsband. Bei der bekannten Vorrichtung ist somit ein wiederholtes Erreichen einer vorbestimmten Spannung im Umreifungsband nicht möglich.In this known device, the overlapping band ends are pressed with a pressure plate against the tensioning wheel of the tensioning device, the pressure plate being provided on a pivot lever which is spring-loaded in the pressure direction. With this spring-loaded lever, the pressure plate and thus the overlapping band ends are pressed against the tensioning wheel. The pivot lever is mounted in such a way that when the tensioning device is used as intended, i.e. when the tensioning wheel is turned, it presses the pressure plate even more firmly against the overlapping band ends, the pivoting lever performing a pivoting movement. This pivoting movement of the pivot lever is used to actuate the switch. The switch is held on the pivot lever and interacts with an adjustable stop which is provided on the housing. When the tensioning device is used as intended, the pressure plate and thus the swivel lever is pivoted in the direction of the tensioning wheel until the switch with the adjustable stop causes the switch to be switched off and thus the drive motor for the tensioning wheel is suspended. The drive motor for the tensioning wheel is therefore switched off depending on how far the pivoting lever has been pivoted and the pressure plate has been pressed against the tensioning wheel. However, the overlapping ends of the strapping are arranged between the pressure plate and the tensioning wheel, so that tolerances in the thickness of the strapping influence the tension that can be achieved in the strapping. In addition, the tensioning wheel and the pressure plate are provided with a cord which is pressed into the overlapping band ends when the pressure plate is pressed in the direction of the tensioning wheel. Differences in the strength of the strapping, which opposes the pressing of the cord into the strapping, also influences the tension that can be achieved in the strapping. In the known device, repeated reaching of a predetermined tension in the strapping band is therefore not possible.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs erläuterten Art zu schaffen, bei der solche Nachteile vermieden sind und mit der eine genau einstellbare Spannung im Umreifungsband wiederholbar erzielt wird.The invention has for its object to provide a device of the type mentioned, in which such disadvantages are avoided and with which a precisely adjustable tension in the strapping is achieved repeatedly.

Diese Aufgabe ist erfindungsgemäss dadurch gelöst, dass der Umschalter aus einem entgegen der Wirkung eines Kraftspeichers aus einer Grundstellung verschränkbaren Hebel besteht, der über eine Einstellschraube auf einen federbelasteten Schalthebel einwirkt, wobei der auf den Schalthebel einwirkende Schwenkhebel mit der Reaktionskraft des Antriebes betätigbar ist. Dadurch wird in einfacher Weise erreicht, dass die Bandspannung genau auf den gewünschten Wert gebracht werden kann, da die Reaktionskraft des Antriebes mit der Aktionskraft des Antriebes zum Drehen des Antriebsrades mit der grösser werdenden Bandspannung im Umreifungsband ansteigt und der Umschalter derart eingestellt werden kann, dass das Ausschalten des Antriebes in dem Zeitpunkt erfolgt, in dem die gewünschte Bandspannung erreicht ist.This object is achieved according to the invention in that the changeover switch consists of a lever which can be locked from a basic position counter to the action of an energy accumulator and which acts via an adjusting screw on a spring-loaded shift lever, the pivot lever acting on the shift lever being actuatable with the reaction force of the drive. It is thereby achieved in a simple manner that the strap tension can be brought exactly to the desired value, since the reaction force of the drive increases with the action force of the drive for rotating the drive wheel with the increasing strap tension in the strapping strap and the changeover switch can be set in such a way that the drive is switched off at the point in time at which the desired belt tension is reached.

Der auf den Schalthebel einwirkende Schwenkhebel kann als zweiarmiger Hebel ausgebildet und auf einer Achse gelagert sein und die Reaktionskraft des Antriebes auf den einen Hebelarm einwirken, während an dem zweiten Hebelarm der gegen die Reaktionskraft gerichtete Kraftspeicher und der Schalthebel angreift. Dadurch wird in einfacher Weise erreicht, dass der zweiarmige Schwenkhebel mit seinem einen Hebelarm an den Antrieb angreift und von der Reaktionskraft beaufschlagt wird, während an dem zweiten Hebelarm ein Kraftspeicher einwirkt, die dem Verschwenken des Schwenkhebels entgegengerichtet ist, so dass zum Verschwenken des Schwenkhebels erst die Kraft des Kraftspeichers überwunden werden muss, bevor mit dem Schalthebel ein Umschalten des Antriebsmotors möglich ist.The pivoting lever acting on the shift lever can be designed as a two-armed lever and mounted on an axis and the reaction force of the drive can act on the one lever arm, while the force accumulator directed against the reaction force and the shift lever act on the second lever arm. It is thereby achieved in a simple manner that the two-arm pivot lever engages the drive with its one lever arm and is acted upon by the reaction force, while a force accumulator acts on the second lever arm, which counteracts the pivoting of the pivot lever, so that only for pivoting the pivot lever the force of the energy accumulator must be overcome before switching the drive motor is possible with the shift lever.

Der Kraftspeicher kann von einer am freien Ende des zweiten Hebelarmes des Schwenkhebels angreifenden Schraubenzugfeder gebildet sein. Mit dieser den Kraftspeicher bildenden Schraubenzugfeder wird der Schwenkhebel in einfacher Weise in der Grundstellung gehalten und setzt dem Verschwenken eine gewisse Kraft entgegen.The energy accumulator can be formed by a tension spring acting on the free end of the second lever arm of the swivel lever. With this tension spring forming the energy store, the pivot lever is held in the basic position in a simple manner and counteracts the pivoting a certain force.

Der Schalthebel kann als zweiarmiger Hebel ausgebildet und ebenfalls auf der Achse des Schwenkhebels schwenkbar gelagert sein und an seinem einen Hebelarm in einer seitlichen, den Schwenkhebel übergreifenden Verbreiterung die Einstellschraube aufweisen. Dadurch sind in einfacher Weise der Schalthebel und der Schwenkhebel auf einer gemeinsamen Achse gelagert, wobei der Schalthebel an seinem einen Hebelarm in einer seitlichen, den Schwenkhebel übergreifenden Verbreiterung die Einstellschraube aufweist.The shift lever can be designed as a two-armed lever and also on the axis of the Be pivotally mounted pivoting lever and have the adjusting screw on its one lever arm in a lateral widening spanning the pivoting lever. As a result, the shift lever and the pivot lever are mounted on a common axis in a simple manner, the shift lever having the adjusting screw on its one lever arm in a lateral widening that extends over the pivot lever.

Der die Einstellschraube aufweisende Hebelarm des Schalthebels kann an seinem freien Ende einen Durchbruch für die Anlenkung einer Schraubenzugfeder aufweisen. Der Schalthebel weist somit ebenfalls eine Schraubenzugfeder auf, die ihn in seiner Grundstellung hält und dem Verschwenken einen Widerstand entgegensetzt.The lever arm of the shift lever, which has the adjusting screw, can have an opening for the articulation of a helical tension spring at its free end. The shift lever thus also has a coil tension spring which holds it in its basic position and opposes the pivoting resistance.

Der zweite Hebelarm kann in seiner Grundstellung in der parallel zur Schwenkachse des Schalthebels verlaufenden Bewegungsbahn eines federbelasteten Umschaltventils für den mit Druckluft betreibbaren Antriebsmotor ragen und nach seinem Verschwenken in die Wirkstellung die Bewegungsbahn für das federbewirkte Umschalten des Ventils freigeben. Der Antrieb der Vorrichtung erfolgt somit in einfacher Weise mit einem Druckluft betriebenen Motor und die Umschaltung erfolgt über ein Umschaltventil, wobei der Schalthebel nach seinem Überführen in die Schaltstellung das federbelastete Umschaltventil freigibt, so dass dieses unter der Wirkung der zugehörigen Feder in die Umschaltstellung verschoben wird.In its basic position, the second lever arm can protrude in the movement path of a spring-loaded changeover valve for the drive motor that can be operated with compressed air and runs parallel to the pivot axis of the shift lever and, after pivoting into the active position, release the movement path for the spring-actuated switching of the valve. The device is thus driven in a simple manner with a motor operated by compressed air, and the switchover takes place via a switchover valve, the switch lever releasing the spring-loaded switchover valve after it has been brought into the switch position, so that it is shifted into the switchover position under the action of the associated spring .

Dem mit Druckluft in beiden Drehrichtungen antreibbaren Motor kann ein mehrstufiges, vorzugsweise dreistufiges Planetenradgetriebe, jeweils mit Sonnenrad, Planetenrädern und Planetenradträgern und innenverzahnten Zahnrad zugeordnet sein, wobei der Motor das Sonnenrad der ersten Getriebestufe und der Planetenradträger der ersten Stufe das Sonnenrad der zweiten Stufe und der Planetenradträger der zweiten Stufe das Sonnenrad der dritten Stufe und der Planetenradträger der dritten Stufe in der einen Drehrichtung das Spannrad zum Spannen des Umreifungsbandes und in der entgegengesetzten Drehrichtung das Werkzeug für die Verschlussbildung betätigt. Mit diesem dreistufigen Planetenradgetriebe wird die Drehzahl des Druckluft betriebenen Motors herabgesetzt, wobei eine entsprechende Erhöhung des Drehmomentes eintritt. Mit dem Druckluft betriebenen Antriebsmotor ist somit in einfacher Weise das erforderliche Drehmoment für das Spannen des Umreifungsbandes und für das Einbringen des Verschlusses erzielbar.The motor, which can be driven with compressed air in both directions of rotation, can be assigned a multi-stage, preferably three-stage planetary gear, each with a sun gear, planet gears and planet gear carriers and internally toothed gear, the motor being the sun gear of the first gear stage and the planet gear carrier of the first stage being the sun gear of the second stage and Planet gear carrier of the second stage the sun gear of the third stage and the planet gear carrier of the third stage in one direction of rotation the tensioning wheel for tensioning the strapping and in the opposite direction of rotation actuated the tool for the closure formation. With this three-stage planetary gear, the speed of the motor operated with compressed air is reduced, with a corresponding increase in torque. With the drive motor operated by compressed air, the required torque for tensioning the strapping and for inserting the closure can thus be achieved in a simple manner.

Der auf den Schalthebel einwirkende Schwenkhebel kann mit seinem ersten Hebelarm mit dem im Getriebegehäuse drehbar gelagerten innenverzahnten Zahnrad der ersten Getriebestufe in Wirkverbindung stehen. Beim bestimmungsgemässen Gebrauch der Vorrichtung entsteht am innenverzahnten Zahnrad der ersten Getriebestufe eine Reaktionskraft, die mit der entsprechenden Aktionskraft des Getriebes ansteigt. Das innenverzahnte Zahnrad ist dabei drehbar im Gehäuse gelagert und wirkt mit dem federbelasteten Schwenkhebel zusammen, so dass von dem innenverzahnten Zahnrad der Schwenkhebel entgegen der Wirkung des zugehörigen Kraftspeichers verschwenkt und damit die Umschaltung bewirkt wird. An der ersten Getriebestufe ist das Drehmoment noch verhältnismässig klein, so dass auch die Reaktionskraft klein ist. Dem Schwenkhebel für die Umschaltung kann somit ein verhältnismässig kleiner Kraftspeicher zugeordnet werden. Ausserdem kann dadurch der Umschaltzeitpunkt genau eingestellt werden.The pivoting lever acting on the shift lever can be operatively connected with its first lever arm to the internally toothed gear of the first gear stage, which is rotatably mounted in the gear housing. When the device is used as intended, a reaction force arises on the internally toothed gear of the first gear stage, which increases with the corresponding action force of the gear. The internally toothed gear is rotatably mounted in the housing and interacts with the spring-loaded pivot lever, so that the pivot lever is pivoted by the internally toothed gear against the action of the associated energy accumulator and thus the changeover is effected. At the first gear stage, the torque is still relatively small, so that the reaction force is also small. A relatively small energy store can thus be assigned to the pivot lever for the switchover. In addition, the switching time can be set precisely.

Das im Getriebegehäuse drehbar gelagerte innenverzahnte Zahnrad kann in der äusseren Mantelfläche eine Aussparung für den ersten Hebelarm des federbelasteten Schwenkhebels aufweisen. Der Schwenkhebel greift mit seinem einen Hebelarm in diese Aussparung ein und wird beim Drehen des innenverzahnten Zahnrades verschwenkt.The internally toothed gear wheel, which is rotatably mounted in the gear housing, can have a recess in the outer lateral surface for the first lever arm of the spring-loaded pivot lever. The swivel lever engages in this recess with its one lever arm and is swiveled when the internally toothed gear is turned.

Dem mit Druckluft betriebenen Antriebsmotor kann in der Druckluftleitung ein Überdruckventil zugeordnet sein. Damit wird in einfacher Weise eine Überlastung des Motors vermieden.A pressure relief valve can be assigned to the drive motor operated with compressed air in the compressed air line. Overloading of the motor is thus avoided in a simple manner.

Auf der Zeichnung ist die Erfindung in einem Ausführungsbeispiel dargestellt, und zwar zeigen:

  • Fig. 1 - eine erfindungsgemässe Vorrichtung in Seitenansicht,
  • Fig. 2 - die erfindungsgemässe Vorrichtung in Draufsicht,
  • Fig. 3 - die erfindungsgemässe Vorrichtung in Rückansicht,
  • Fig. 4 - die Umschalteinrichtung in Seitenansicht,
  • Fig. 5 - die Umschalteinrichtung in Draufsicht,
  • Fig. 6 - das Überdruckventil in einer Schnittdarstellung.
The invention is shown in an exemplary embodiment in the drawing, in which:
  • 1 - a device according to the invention in side view,
  • 2 - the device according to the invention in plan view,
  • 3 - the device according to the invention in rear view,
  • 4 - the switching device in side view,
  • 5 - the switching device in plan view,
  • Fig. 6 - the pressure relief valve in a sectional view.

Die auf der Zeichnung dargestellte Vorrichtung dient zum Spannen eines um ein nicht näher dargestelltes Packstück gelegten und ebenfalls nicht näher dargestellten Umreifungsbandes und zum Verbinden der sich überlappenden Enden des Umreifungsbandes mit einem hülsenlosen Verschluss.The device shown in the drawing is used for tensioning a strapping placed around a package (not shown) and also not shown and for connecting the overlapping ends of the strapping with a sleeve-less closure.

Wie insbesondere aus den Figuren 1 bis 3 ersichtlich, besteht die Vorrichtung aus einem Gehäuse 10 mit einer auf das Packstück aufsetzbaren Grundplatte 11, die das untere Werkzeug für die Verschlussbildung aufweist, während das obere Werkzeug für die Verschlussbildung senkrecht verschiebbar im Gehäuse 10 angeordnet ist. Die Verschiebung des oberen Werkzeuges für die Verschlussbildung im Gehäuse 10 erfolgt mit einem nicht näher dargestellten Exzenter, der an einer Welle 12 gehaltert ist. Der Antrieb der Welle 12 erfolgt in noch zu beschreibender Weise mit einem Motor 13, der mit Druckluft angetrieben wird.As can be seen in particular from FIGS. 1 to 3, the device consists of a housing 10 with a base plate 11 which can be placed on the package and which has the lower tool for the closure formation, while the upper tool for the closure formation is arranged vertically displaceably in the housing 10. The upper tool for the closure formation in the housing 10 is displaced with an eccentric, not shown, which is held on a shaft 12. The shaft 12 is driven in a manner yet to be described with a motor 13 which is driven with compressed air.

Das Gehäuse 10 weist für ein seitliches Einführen der sich überlappenden Bandenden zwischen die beiden Werkzeuge für die Verschlussbildung über der Grundplatte 11 eine schlitzförmige Aufnahme 14 auf. Weiterhin ist das Gehäuse 10 in einer Aussparung 15 mit einer schwenkbar gelagerten Spanneinrichtung 16 versehen, die mit einer nicht näher dargestellten Feder in Richtung auf die Grundplatte 11 vorgespannt ist. Die Spanneinrichtung 16 ist dabei um den Lagerzapfen 17 schwenkbar und weist ein auf die Oberseite der sich überlappenden Bandenden einwirkendes Spannrad 18 auf. Der Antrieb des Spannrades 18 erfolgt in noch zu beschreibender Weise ebenfalls mit dem Motor 13, der mit Druckluft angetrieben wird.The housing 10 has a slot-shaped receptacle 14 for the lateral insertion of the overlapping band ends between the two tools for forming the closure over the base plate 11. Furthermore, the housing 10 is provided in a recess 15 with a pivotably mounted tensioning device 16, which is biased towards the base plate 11 with a spring, not shown. The clamping device 16 is around the bearing pin 17th pivotable and has a tensioning wheel 18 acting on the upper side of the overlapping band ends. The tensioning wheel 18 is also driven in a manner to be described, also with the motor 13, which is driven with compressed air.

Die um den Lagerzapfen 17 schwenkbare Spanneinrichtung 16 ist mit einem Handhebel 19 versehen, mit dem die Spanneinrichtung 16 aus der in der Fig. 1 dargestellten Grundstellung, in der das Spannrad 18 gegen die Grundplatte 11 anliegt, entgegen der Wirkung der nicht näher dargesteliten Feder in die Bandeinführstellung überführbar ist. In der Bandeinführstellung ist das Spannrad 18 der Spanneinrichtung 16 mit einem solchen Abstand zur Grundplatte 11 angeordnet, dass die sich überlappenden Bandenden des Umreifungsbandes ohne Schwierigkeiten unter das Spannrad 18 eingeführt werden können.The pivoting about the bearing pin 17 clamping device 16 is provided with a hand lever 19 with which the clamping device 16 from the basic position shown in FIG. 1, in which the tensioning wheel 18 bears against the base plate 11, against the action of the spring not shown in FIG the tape insertion position is transferable. In the strap insertion position, the tensioning wheel 18 of the tensioning device 16 is arranged at such a distance from the base plate 11 that the overlapping strap ends of the strapping strap can be inserted under the tensioning wheel 18 without difficulty.

Die auf der Zeichnung dargestellte Vorrichtung dient zum Spannen eines von einer nicht dargestellten Vorratsrolle abziehbaren und um ein Packstück gelegten Umreifungsbandes und zum Verbinden der sich überlappenden Enden des Umreifungsbandes mit einem hülsenlosen Verschluss und zum Abtrennen des für die gespannte Umreifung überschüssigen Teiles des zur nicht näher dargestellten Vorratsrolle führenden Umreifungsbandes. Die Abtrenneinrichtung besteht dabei aus einem nicht näher dargestellten Kerbmesser, welches am oberen Werkzeug für die Verschlussbildung vorgesehen ist.The device shown in the drawing is used for tensioning a strapping that can be pulled off a storage roll (not shown) and placed around a package, and for connecting the overlapping ends of the strapping with a sleeve-less closure and for separating the part of the strapping that is not shown for the strapping Supply roll of leading strapping tape. The separating device consists of a notch knife, not shown, which is provided on the upper tool for the formation of the closure.

Der Druckluftmotor 13 ist mit einem nachgeschalteten Untersetzungsgetriebe 20 in einem besonderen Gehäuse 21 untergebracht, welches auf dem Gehäuse 10 aufgesetzt ist. An dem Gehäuse 21 ist dabei ein Handhebel 22 angeordnet, der über dem Handhebel 19 in der Spanneinrichtung 16 vorgesehen ist. Von der Bedienungsperson können somit beide Handhebel 19 und 22 erfasst und zusammengedrückt werden, so dass die Spanneinrichtung 16 in die Bandeinführstellung überführt werden kann.The compressed air motor 13 is accommodated with a downstream reduction gear 20 in a special housing 21 which is placed on the housing 10. A hand lever 22 is arranged on the housing 21 and is provided above the hand lever 19 in the tensioning device 16. The operator can thus grasp and compress both hand levers 19 and 22 so that the tensioning device 16 can be transferred to the tape insertion position.

Wie insbesondere aus der Fig. 2 ersichtlich, ist der Druckluftmotor parallel neben dem Untersetzungsgetriebe 20 in dem Gehäuse 21 untergebracht, so dass eine kompakte Bauweise erzielt wird. Die Drehachse 23 vom Druckluftmotor 13 verläuft dabei parallel zur Drehachse 24 vom Untersetzungsgetriebe 20 und auch parallel zur Drehachse 25 des Spannrades 18 und parallel zur Welle 12 des oberen Werkzeuges für die Verschlussbildung. Die Drehbewegung des Druckluftmotors 13 kann so in einfacher Weise über Stirnräder übertragen werden.As can be seen in particular from FIG. 2, the compressed air motor is accommodated in parallel in the housing 21 next to the reduction gear 20, so that a compact design is achieved. The axis of rotation 23 of the compressed air motor 13 runs parallel to the axis of rotation 24 of the reduction gear 20 and also parallel to the axis of rotation 25 of the tensioning wheel 18 and parallel to the shaft 12 of the upper tool for the closure formation. The rotary movement of the compressed air motor 13 can thus be transmitted in a simple manner via spur gears.

Auf der Drehachse 23 des Druckluftmotors 13 ist ein Ritzel 26 vorgesehen, welches mit einem Zwischenzahnrad 27, mit einem Zahnrad 28 in Verbindung steht, welches drehfest auf der Drehachse 24 des Untersetzungsgetriebes 20 angeordnet ist. Das Untersetzungsgetriebe besteht aus einem dreistufigen Planetenradgetriebe, wobei jede Stufe jeweils in nicht näher dargestellter Weise ein Sonnenrad, Planetenräder, einen Planetenradträger und ein innenverzahntes Zahnrad aufweist. Die vom Druckluftmotor 13 angetriebene Drehachse 24 betätigt das Sonnenrad der ersten Getriebestufe und der Planetenradträger der ersten Stufe das Sonnenrad der zweiten Stufe und der Planetenradträger der zweiten Stufe das Sonnenrad der dritten Stufe und der Planetenradträger der dritten Stufe eine Drehachse 29, auf der ein Zahnrad 30 aufgesetzt ist. Das Zahnrad 30 wirkt, wie insbesondere aus der Fig. 3 ersichtlich, über ein Zwischenrad 31 auf ein Zahnrad 32, welches mit einer Einwegkupplung 33 auf der Welle 12 des oberen Werkzeuges für die Verschlussbildung angeordnet ist. An dem Zwischenrad 31 greift weiterhin ein zweites Zwischenrad 34 an, welches auf dem Lagerzapfen 17 der Spanneinrichtung drehbar gelagert ist. Das Zwischenrad 34 kämmt mit einem Zahnrad 35, welches über eine Einwegkupplung 36 auf der Drehachse 25 des Spannrades 18 aufgesetzt ist.On the axis of rotation 23 of the compressed air motor 13, a pinion 26 is provided, which is connected to an intermediate gear 27, with a gear 28 which is arranged in a rotationally fixed manner on the axis of rotation 24 of the reduction gear 20. The reduction gear consists of a three-stage planetary gear, each stage each having a sun gear, planet gears, a planet carrier and an internally toothed gear in a manner not shown. The axis of rotation 24 driven by the compressed air motor 13 actuates the sun gear of the first gear stage and the planet gear carrier of the first stage the sun gear of the second stage and the planet gear carrier of the second stage the sun gear of the third stage and the planet gear carrier of the third stage a rotational axis 29 on which a gear wheel 30 is put on. The gear 30 acts, as can be seen in particular from FIG. 3, via an intermediate gear 31 on a gear 32 which is arranged with a one-way clutch 33 on the shaft 12 of the upper tool for the closure formation. A second intermediate wheel 34, which is rotatably mounted on the bearing pin 17 of the tensioning device, also acts on the intermediate wheel 31. The intermediate gear 34 meshes with a gear 35, which is placed on the axis of rotation 25 of the tensioning wheel 18 via a one-way clutch 36.

Beim bestimmungsgemässen Gebrauch ist zunächst das Umreifungsband zu spannen, d. h., das Spannrad 18 mit dem Druckluftmotor 13 anzutreiben, bevor der hülsenlose Verschluss in die sich überlappenden Bandenden einzubringen ist. Hierzu wird der Druckluftmotor 13, der umschaltbar ist, in seiner einen Drehrichtung angetrieben. Dabei wird auch das auf der Welle 12 mit der Einwegkupplung 33 aufgesetzte Zahnrad 32 angetrieben. Das Drehen des Zahnrades 32 erfolgt jedoch in der Richtung, dass über der Einwegkupplung 33 die Welle 12 für das obere Werkzeug für die Verschlussbildung nicht mitgedreht wird. Nachdem das Umreifungsband mit der gewünschten Spannung versehen worden ist, erfolgt in noch zu beschreibender Weise ein Umschalten des Druckluftmotors 13, so dass dieser nunmehr in entgegengesetzter Richtung dreht. Dabei wird nunmehr die Welle 12 des oberen Werkzeuges für die Verschlussbildung über der Einwegkupplung 33 von dem Zahnrad 32 mitgenommen. Bei dieser Drehrichtung des Antriebes wird auch das Zahnrad 35 gedreht, das dem Spannrad 18 zugeordnet ist, über die Einwegkupplung 36 wird jedoch die Drehachse 25 des Spannrades 18 nicht mitgedreht. Der Drehachse 25 des Spannrades 18 kann dabei eine weitere, nicht näher dargestellte Einwegkupplung zugeordnet sein, die ein ungewolltes Zurückdrehen des Spannrades 18 verhindert. Mit dem Druckluftmotor 13 wird somit in der einen Drehrichtung das Spannrad 18 und in der anderen Drehrichtung die Welle 12 für das obere Werkzeug der Verschlussbildung betätigt.When used as intended, the strapping must first be tensioned. that is, to drive the tensioning wheel 18 with the compressed air motor 13 before the sleeveless closure is to be introduced into the overlapping band ends. For this purpose, the air motor 13, which is switchable, is driven in one direction of rotation. In this case, the gear 32 which is fitted on the shaft 12 with the one-way clutch 33 is driven. However, the gear 32 is rotated in the direction that the shaft 12 for the upper tool for the closure formation is not rotated via the one-way clutch 33. After the strapping has been provided with the desired tension, the compressed air motor 13 is switched over in a manner to be described, so that it now rotates in the opposite direction. The shaft 12 of the upper tool for the closure formation is now carried along by the gear 32 via the one-way clutch 33. In this direction of rotation of the drive, the gear 35, which is assigned to the tensioning wheel 18, is also rotated, but the axis of rotation 25 of the tensioning wheel 18 is not rotated via the one-way clutch 36. The axis of rotation 25 of the tensioning wheel 18 can be assigned a further one-way clutch, not shown in detail, which prevents the tensioning wheel 18 from being turned back unintentionally. With the compressed air motor 13, the tensioning wheel 18 is thus actuated in one direction of rotation and the shaft 12 for the upper tool for forming the closure in the other direction of rotation.

Die Umschaltung des Druckluftmotors 13 von der einen Drehrichtung in die andere Drehrichtung erfolgt automatisch in Abhängigkeit von der im Umreifungsband herrschenden Spannung, d.h., in Abhängigkeit von dem Drehmoment des Antriebes, welches für das weitere Spannen erforderlich ist. Die Umschalteinrichtung ist dabei in den Figuren 4 und 5 näher dargestellt. Der Umschalter 37 besteht aus einem zweiarmigen Winkelhebel 38, der auf einer Achse 39 schwenkbar gelagert ist. Der kürzere Hebelarm 40 des Winkelhebels 38 wird in noch zu beschreibender Weise von der Reaktionskraft des Untersetzungsgetriebes 20 beaufschlagt, während an dem längeren Hebelarm 41 des Winkelhebels 38 eine Schraubenzugfeder 42 angelenkt ist. Ein Verschwenken des Winkelhebels 38 aus der in der Fig. 4 dargestellten Grundstellung in die Schaltstellung erfolgt somit entgegen der Wirkung der Schraubenzugfeder 42. Der Hebelarm 41 des Winkelhebels 38 wirkt über eine Einstellschraube 43 auf einen Schalthebel 44, der ebenfalls auf der Achse 39 schwenkbar gelagert ist. Der Schalthebel 44 weist einen zum Hebelarm 41 des Winkelhebels parallel verlaufenden Hebelarm 45 auf, der mit einer den Winkelhebel übergreifenden Verbreiterung 46 versehen ist. In der Verbreiterung 46 ist die Einstellschraube 43 in einer nicht näher dargestellten Gewindebohrung eingezogen. An dem freien Ende des Hebelarms 45 des Schalthebels 44 ist ebenfalls eine Schraubenzugfeder 47 angelenkt, so dass ein Verschwenken des Schalthebels 44 aus der in der Fig. 4 mit ausgezogenen Linien dargestellten Grundstellung in die mit gestrichelten Linien dargestellte Schaltstellung entgegen der Wirkung der Schraubenzugfeder 47 erfolgt.The switching of the compressed air motor 13 from one direction of rotation to the other direction of rotation takes place automatically as a function of the tension prevailing in the strapping band, ie as a function of the torque of the drive which is required for the further tensioning. The switchover device is shown in more detail in FIGS. 4 and 5. The switch 37 consists of a two-armed angle lever 38 which is pivotally mounted on an axis 39. The shorter lever arm 40 of the angle lever 38 is in a manner to be described by the reaction force of the reduction gear bes acted upon 20, while a helical tension spring 42 is articulated on the longer lever arm 41 of the angle lever 38. A pivoting of the angle lever 38 from the basic position shown in FIG. 4 into the switching position thus takes place counter to the action of the tension spring 42. The lever arm 41 of the angle lever 38 acts via an adjusting screw 43 on a switching lever 44 which is also pivotably mounted on the axis 39 is. The shift lever 44 has a lever arm 45 which runs parallel to the lever arm 41 of the angle lever and which is provided with a widening 46 which overlaps the angle lever. In the widening 46, the adjusting screw 43 is drawn into a threaded bore, not shown. At the free end of the lever arm 45 of the shift lever 44, a helical tension spring 47 is also articulated, so that the shift lever 44 is pivoted from the basic position shown in solid lines in FIG. 4 into the shift position shown in dashed lines against the action of the tension spring 47 .

Der zweite Hebelarm 48 des Schalthebels 44 ragt in seiner Grundstellung in der parallel zur Schwenkachse 39 des Schalthebels 44 verlaufenden Bewegungsbahn eines federbelasteten Umschaltventils 49 für den Druckluftmotor 13 und gibt nach seinem Verschwenken in die Schaltstellung die Bewegungsbahn für das federbewirkte Umschalten des Ventils 49 frei. Der Kolben 50 des Umschaltventils 49 steht dabei unter der Wirkung einer Schraubendruckfeder 51, die den Kolben 50 in die Umschaltstellung verschiebt.In its basic position, the second lever arm 48 of the switching lever 44 protrudes in the movement path of a spring-loaded changeover valve 49 for the compressed air motor 13 which runs parallel to the pivot axis 39 of the switching lever 44 and, after it has pivoted into the switching position, releases the movement path for the spring-actuated switching of the valve 49. The piston 50 of the changeover valve 49 is under the action of a helical compression spring 51 which shifts the piston 50 into the changeover position.

Wie bereits erwähnt, erfolgt die Betätigung des Umschalters 37 mit der Reaktionskraft des Antriebes. Das im Getriebegehäuse 21 drehbar gelagerte innenverzahnte Zahnrad 52 der ersten Getriebestufe weist in der äusseren Mantelfläche 53 eine Aussparung 54 für den ersten Hebelarm 40 des winkelförmigen Schwenkhebels 38 auf. Beim bestimmungsgemässen Gebrauch der Vorrichtung steigt die zum weiteren Spannen des Umreifungsbandes erforderliche Kraft des Getriebes an, so dass auch die im innenverzahnten Zahnrad 52 der ersten Getriebestufe auftretende Reaktionskraft grösser wird. Diese Reaktionskraft wird beim weiteren Spannen so gross, dass der Schwenkhebel 38 entgegen der Wirkung der Schraubenzugfeder 42 und anschliessend der Schalthebel 44 entgegen der Wirkung der Schraubenzugfeder 47 in die Schaltstellung überführt werden, in der der Kolben 50 mit der Wirkung der Schraubendruckfeder 51 aus der in der Fig. 5 dargestellten Grundstellung verschoben wird und damit die Drehrichtung des Druckluftmotors 13 umkehrt. Mit diesem Umschalter 37 ist somit genau einstellbar, welche Spannung im Umreifungsband erzeugt werden muss, damit der Druckluftmotor 13 umgeschaltet wird und nunmehr die sich überlappenden Bandenden miteinander verbindet. Die im Umreifungsband erzielte Spannung kann dabei mit der Einstellschraube 43 verändert werden.As already mentioned, the switch 37 is actuated with the reaction force of the drive. The internally toothed gear 52 of the first gear stage, which is rotatably mounted in the gear housing 21, has a recess 54 in the outer lateral surface 53 for the first lever arm 40 of the angular swivel lever 38. When the device is used as intended, the force of the gear required for further tensioning of the strapping increases, so that the reaction force occurring in the internally toothed gear 52 of the first gear stage also increases. This reaction force becomes so great during further tensioning that the swivel lever 38 against the action of the coil tension spring 42 and then the shift lever 44 against the action of the coil tension spring 47 are transferred to the switching position in which the piston 50 with the action of the compression coil spring 51 moves from the in 5 basic position shown is shifted and thus reverses the direction of rotation of the air motor 13. With this changeover switch 37 it is thus possible to set exactly which tension has to be generated in the strapping band so that the compressed air motor 13 is switched over and now connects the overlapping band ends to one another. The tension achieved in the strapping can be changed with the adjusting screw 43.

Um eine Überlastung des Druckluftmotors 13 zu vermeiden, kann in der Druckluftleitung 55 ein Überdruckventil 56 vorgesehen werden. Dieses Überdruckventil weist eine Ventilkugel 57 auf, die unter der Wirkung einer Schraubendruckfeder 58 steht, wobei gegen das rückwärtige Ende der Schraubendruckfeder 58 eine verstellbare Schraube 59 anliegt, mit der die Vorspannung der Schraubendruckfeder 58 verstellt werden kann. Die Ventilkugel 57 wird mit der Schraubendruckfeder 58 gegen einen Ventilsitz 60 gedrückt und schliesst damit die Druckluftleitung 55 ab. Beim Eintreten eines Überdruckes in der Druckluftleitung 55 wird die Ventilkugel 57 entgegen der Wirkung der Schraubendruckfeder 58 vom Ventilsitz 60 abgehoben, so dass die Druckluft durch die Leitung 61 abfliessen kann. Mit diesem Überdruckventil 56 werden somit Überlastungen des Gerätes ausgeschaltet, so dass die Vorrichtung aus Handhabungsgründen leicht ausgebildet werden kann.In order to avoid overloading the compressed air motor 13, a pressure relief valve 56 can be provided in the compressed air line 55. This pressure relief valve has a valve ball 57, which is under the action of a helical compression spring 58, an adjustable screw 59 abutting against the rear end of the helical compression spring 58, with which the pretension of the helical compression spring 58 can be adjusted. The valve ball 57 is pressed with the helical compression spring 58 against a valve seat 60 and thus closes off the compressed air line 55. When an overpressure occurs in the compressed air line 55, the valve ball 57 is raised against the action of the helical compression spring 58 from the valve seat 60, so that the compressed air can flow out through the line 61. With this pressure relief valve 56, overloads of the device are thus switched off, so that the device can be easily designed for handling reasons.

Claims (10)

1. Device for tensioning a strap withdrawable from a supply reel and placed about a package and for inter-connecting the overlapping ends of the strap with a closure and for severing the part of the strap not needed for the tensioned strapping leading to the supply roller, consisting of a housing (10) with a base plate (11) supported on the package, which carries the lower tool for forming the closure, whereas the upper tool for forming the closure is arranged vertically movable in the housing (10) and is actuable into the operative position by means of a motorised drive and the housing includes a slot-shaped receiver (14) for lateral insertion of the overlapping ends of the strap between the two tools above the base plate (11) and is also provided with a tensioning device (16), which includes a tensioning wheel (18) acting on the upper surface of the overlapping ends of the strap and rotatable with a motor drive in the tensioning direction, where the motor drive of the upper tool for forming the closure and the motor drive for the tensioning wheel (18) are formed by a single driving motor (13), which in its one direction of rotation first actuates the tensioning wheel (18) for tensioning the strap and, after actuation of a switch dependent upon the strap tension, reverses the direction of rotation and actuates the tool for forming the closure, characterised in that the switch (37) consists of a lever (38) limitable from its basic position against the action of a force store (42), which operates via a setting screw (43) against a spring-loaded switch lever (44), the pivot lever (38) acting on the switch lever (44) being actuable with the reaction force of the drive.
2. Device according to claim 1, characterised in that the pivot lever (38) actuating the switch lever (44) is constructed as a two-armed lever and is mounted on a spindle (39), where the reaction force of the drive acts on the one lever arm (40), whereas the force store directed against the reaction force and the switch lever (44) engage the second lever arm (41).
3. Device according to claim 2, characterised in that the force store (42) is formed by a helical tension spring (42) engaging the free end of the second lever arm (41) of the pivot lever (38).
4. Device according to any of claims 1 to 3, characterised in that the switch lever (44) is formed as a two-armed lever and is likewise pivotably mounted on the spindle (39) of the pivot lever (38) and has the setting screw (43) on its one lever arm (45) in a lateral widening (46) engaging the pivot lever (38).
5. Device according to any of claims 1 to 4, characterised in that the lever arm (45) of the switch lever (44) including the setting screw (43) includes on its free end an interruption for receiving a helical tension spring (47). 6. Device according to any of claims 1 to 5, characterised in that the second lever arm (48) in its base position projects into the path or movement, running parallel to the pivot spindle (39) of the switching lever (44), of a spring-loaded switching valve (49) for the compressed-air-driven driving motor (13) and, after pivoting into the effective position, frees the path of movement for the spring-actuated operation of the valve (49).
7. Device according to any of claims 1 to 6, characterised in that a multi-stage, preferably three-stage, planet wheel drive (20), comprising a sun wheel, planet wheels, planet wheel carriers and internally-toothed gear-wheel, is associated with the motor (13) drivable by compressed air in both directions of rotation, whereby the motor (13), the sun wheel of the first driving stage, the planet wheel carrier of the first stage, the sun wheel of the second stage and the planet wheel carrier of the second stage, the sun wheel of the third stage and the planet wheel carrier of the third stage in one direction of rotation operate the tensioning, wheel (18) for tensioning the strap and, in the opposite direction of rotation, actuate the tool for forming the closure.
8. Device according to any of claims 1 to 7, characterised in that the pivot lever (38) acting on the switch lever (44) is in operative connection by means of its first lever arm (40) with the gear wheel (52) of the first gear stage rotatably supported in the gear housing (21).
9. Device according to any of claims 1 to 8, characterised in that the internally-toothed gear-wheel (52) rotatably mounted in the gear housing (21) includes in its outer surface (53) a recess (54) for the first lever arm (40) of the spring-loaded pivot lever (38).
10. Device according to any of claims 1 to 9, characterised in that an over-pressure valve (56) is associated with the compressed-air-driven driving motor (13) in the compressed air duct (55).
EP83105760A 1982-08-11 1983-06-11 Device for tensioning a bundling strap applied around a package Expired EP0100836B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823229869 DE3229869A1 (en) 1982-08-11 1982-08-11 DEVICE FOR TENSIONING A STRAP STRAPPED A PACKAGE
DE3229869 1982-08-11

Publications (3)

Publication Number Publication Date
EP0100836A2 EP0100836A2 (en) 1984-02-22
EP0100836A3 EP0100836A3 (en) 1986-12-30
EP0100836B1 true EP0100836B1 (en) 1988-05-11

Family

ID=6170601

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83105760A Expired EP0100836B1 (en) 1982-08-11 1983-06-11 Device for tensioning a bundling strap applied around a package

Country Status (3)

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US (1) US4574848A (en)
EP (1) EP0100836B1 (en)
DE (2) DE3229869A1 (en)

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DE3600909A1 (en) * 1986-01-15 1987-07-16 Hoesch Ag Control device
US5417698A (en) * 1992-10-09 1995-05-23 United States Surgical Corporation Apparatus for tightening elongated wound closure elements
US5355913A (en) * 1992-10-09 1994-10-18 United States Surgical Corporation Surgical repair device
US5975150A (en) * 1998-06-03 1999-11-02 Teknika Usa, Inc. Strapping band tightening device
US8522830B2 (en) * 2009-12-03 2013-09-03 Teknika Usa, Inc. Two stroke crimping device
US9221567B2 (en) 2012-01-25 2015-12-29 Southern Bracing Systems Enterprises, Llc Systems, methods, and devices for tensioning straps
CN103831785A (en) * 2012-11-22 2014-06-04 富泰华工业（深圳）有限公司 Positioning and tensioning jig
EP3831582A1 (en) 2015-10-02 2021-06-09 Asco, L.P. A combination manifold and valve housing for a manifold bank made by an additive manufacturing method
WO2017058238A1 (en) 2015-10-02 2017-04-06 Numatics, Incorporated Combination manifold block, valve housing and spool valve assembly for a manifold bank

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US1815345A (en) * 1927-02-05 1931-07-21 Howard D Colman Overload release mechanism
US2593933A (en) * 1947-07-03 1952-04-22 Raymond C Strawn Planetary power transmission device
DE1113897B (en) * 1954-02-02 1961-09-14 Johan Olov Larsson Tensioning device on strapping machines
DE1238346B (en) * 1963-09-10 1967-04-06 Zahnradfabrik Friedrichshafen Two-speed epicyclic gear group transmission that can be switched without interruption of traction, especially for assembly with motor vehicle gearboxes
US3506041A (en) * 1968-06-03 1970-04-14 Signode Corp Pneumatic sealing control system for strapping machines
DE2537443A1 (en) * 1975-08-22 1977-03-03 Joachim Helff Integrated drive for introduction and sealing of binding agent - features machine with two transport wheels driven at different speeds in same direction
DE2641889C3 (en) * 1976-09-17 1982-04-29 Ley, Klaus, 5608 Radevormwald Binding tool
CH605258A5 (en) * 1976-10-08 1978-09-29 Strapex Ag
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DE2808542A1 (en) * 1978-02-28 1979-09-06 Joachim Ing Grad Helff Steel strap tightening and securing mechanism - has tension wheel actuating release mechanism for stamping and cutting
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US4313779A (en) * 1979-07-30 1982-02-02 Signode Corporation All electric friction fusion strapping tool

Also Published As

Publication number Publication date
EP0100836A3 (en) 1986-12-30
DE3376552D1 (en) 1988-06-16
DE3229869C2 (en) 1989-07-27
EP0100836A2 (en) 1984-02-22
DE3229869A1 (en) 1984-02-16
US4574848A (en) 1986-03-11

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