EP0095643B1 - Vorschub- und Spannvorrichtung für ein um ein Packstück zu spannendes Umreifungsband - Google Patents

Vorschub- und Spannvorrichtung für ein um ein Packstück zu spannendes Umreifungsband Download PDF

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Publication number
EP0095643B1
EP0095643B1 EP83104801A EP83104801A EP0095643B1 EP 0095643 B1 EP0095643 B1 EP 0095643B1 EP 83104801 A EP83104801 A EP 83104801A EP 83104801 A EP83104801 A EP 83104801A EP 0095643 B1 EP0095643 B1 EP 0095643B1
Authority
EP
European Patent Office
Prior art keywords
wheel
tensioning
strap
drivable
feeding
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
EP83104801A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0095643A2 (de
EP0095643A3 (en
Inventor
Günter Bartzick
Gerd Bühne
Reinhard Ing. Naydowski (Grad.)
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
Original Assignee
Hoesch 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 Hoesch AG filed Critical Hoesch AG
Priority to AT83104801T priority Critical patent/ATE34351T1/de
Publication of EP0095643A2 publication Critical patent/EP0095643A2/de
Priority to CA000452132A priority patent/CA1221571A/en
Publication of EP0095643A3 publication Critical patent/EP0095643A3/de
Application granted granted Critical
Publication of EP0095643B1 publication Critical patent/EP0095643B1/de
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
    • B65B13/22—Means for controlling tension of binding means

Definitions

  • the invention relates to a feed and tensioning device for a strapping band to be tensioned around a package, as described in DE-OS 29 06 756 and in which the strapping is non-positively between a receiving pair of wheels in a band guide which encloses the package to be strapped at a distance can be pushed forward and then with the front end of the belt held in place by reversing the direction of rotation of the pair of wheels by pulling back into contact with the package and then tensioning with a special tensioning wheel with lower feed speed and greater force.
  • the pair of wheels for advancing and retracting the band and the tensioning wheel are driven by a single motor, however, a reduction gear is provided between the pair of wheels for advancing and retracting the strapping band and the tensioning wheel, so that the tensioning wheel with a lower speed and greater Power turns.
  • the tensioning wheel is partially wrapped around by the strapping band, so that the tensioning wheel frictionally engages the strap during tensioning.
  • a strap guide is assigned to the tensioning wheel, so that when the strap is pushed forward, the strapping strap only rests against the inside of the strap guide and does not come into contact with the tensioning wheel.
  • the invention has for its object to improve a feed and tensioning device of the type described above so that the pressing force of the driving roller is increased and adjustable in a metered manner in accordance with the increasing force in the strapping band during tensioning, according to DE-OS -29 06 756 the advantage of a simple structural design of the device and the advantage of a spec. low contact pressure of the driving role on the strapping should be maintained.
  • the tensioning of the strapping is carried out with a pair of wheels, of which one wheel is designed as a rotating wheel and the other wheel is rotatable in the tensioning direction with an associated motor and is mounted with its axis in a pivot lever such that when Tensioning the strapping, the drivable tensioning wheel partially wrapped by the strapping against the strapping that is supported against the moving wheel with an increasing contact pressure corresponding to the increasing tension in the strapping.
  • a tensioning device is created in a simple manner, with which a very high tension in the strapping band can be achieved, because when the strapping band is tensioned, there is no fear of the strapping band slipping on the tensioning wheel, since the driven tensioning wheel with increasing contact pressure corresponding to the increasing tension in the strapping band is pressed against the strapping that supports itself against the rotating wheel.
  • the direction of rotation of the driven tensioning wheel runs in such a way that a force component occurs in the sense of pushing the two wheels apart, but this force component is smaller than the contact pressure caused by the pivoting lever due to the strap tension. Due to the pivotable mounting of the tensioning wheel on the pivoting lever and the direction of rotation of the tensioning wheel, it is thus achieved in a simple manner that the force component resulting from the direction of rotation of the tensioning wheel is opposed to the contact pressure caused by the pivoting lever by the belt tension, so that these two forces do not occur add to such a force and cause destruction or deformation of the strapping, which is made in particular of plastic.
  • the force component resulting from the direction of rotation of the tensioning wheel can be very small, since it is sufficient for the gentle treatment of the strapping, which is made in particular of plastic, if the pressing force is not increased by the direction of rotation of the tensioning wheel.
  • the drivable tensioning wheel can be provided on the metallic outer surface with a cord or the like which increases the coefficient of friction. This easily prevents the strapping from slipping on the outer surface of the drivable tensioning wheel.
  • the outer surface of the rotating wheel that comes into contact with the strapping can be formed from an abrasion-resistant, soft elastic pad.
  • the drivable tensioning wheel presses with the strapping into the abrasion-resistant, soft-elastic support of the idler wheel, so that a large-area support is achieved both on the drivable tensioning wheel and on the idler wheel, at the same time in a simple manner damaging the, in particular Plastic existing, strapping can be avoided.
  • the drivable tensioning wheel can at the same time form a deflection for the strapping band and the part of the strapping band leading from the drivable tensioning wheel to the package can run at least approximately parallel to the pressing direction of the drivable tensioning wheel mounted on the swivel lever.
  • the tensioning wheel which can be driven in the strapping band pushes the drivable tensioning wheel against the strapping band which is supported against the moving wheel with increasing contact pressure.
  • the pressing of the drivable tensioning wheel mounted on the swivel lever against the strapping band supported by the rotating wheel can take place against the action of a spring acting on the swivel lever. It is thereby achieved in a simple manner that the drivable tensioning wheel mounted on the pivoting lever strives to assume a position in which the contact pressure is low or zero.
  • the drivable tensioning wheel mounted on the swivel lever can be held with the spring in a basic position prior to tensioning when the strapping band is advanced, in which the drivable tensioning wheel and the associated idler wheel for free advancement of the strapping band with a distance from one another which exceeds the thickness of the strapping band are arranged.
  • the strapping tape can thus be freely passed between the drivable tensioning wheel and the associated idler wheel when advancing.
  • the swivel lever carrying the drivable tensioning wheel can rest against a fixed stop surface with an adjustable stop.
  • the distance between the drivable tensioning wheel and the idling wheel, which exceeds the thickness of the strapping band can be adapted in a simple manner to the respective requirements for free advancement of the strapping band.
  • the strapping between the receiving pair of wheels for advancing and retracting the strapping can be formed by a pushing and retracting wheel which can be driven in both directions of rotation with its own motor and a rotating wheel.
  • the pair of wheels for advancing and retracting the strapping is advantageously formed by a drivable advancing and retracting wheel and a rotating wheel, the advancing and retracting wheel having its own motor which can be effective in both directions of rotation.
  • the co-rotating wheel interacting with the drivable feed and retraction wheel can also form the co-rotating wheel for the drivable tensioning wheel.
  • the rotating wheel thus interacts in a simple manner with the drivable feed and retraction wheel and with the drivable tensioning wheel.
  • the drivable feed and retraction wheel can have a polished, metallic outer surface.
  • the drivable advancing and retracting wheel thus has a small coefficient of friction, so that only low advancing and retracting forces can be transmitted with the drivable advancing and retracting wheel.
  • This force is sufficient to advance the strapping into the band guide which encloses the package to be strapped at a distance. Furthermore, this small force is sufficient to pull the strap back while the front strap end is being held, so that the strapping comes into contact with the package and the tensioning wheel. Furthermore, this force is sufficient to bring the drivable tensioning wheel mounted on the swivel lever into abutment against the strapping band, which is supported against the rotating wheel. Further retracting the tape, i.e. that is, the tensioning of the band is now carried out by the drivable tensioning wheel, the drivable advancing and retracting wheel slipping on the strapping band.
  • the rotating wheel can be rotatably mounted on the one swivel arm of a rocker and can engage a spring on the rocker, under the action of which the rocker is held in a basic position in which the rotating wheel rests non-positively against the strapping band supported on the drivable advancing and retracting wheel .
  • the rocker that rotatably supports the rotating wheel is thus held in the basic position in which the rotating wheel rests non-positively against the strapping band that is supported on the drivable advancing and retracting wheel.
  • the swivel lever carrying the drivable tensioning wheel and the rocker carrying the rotating wheel can be pivotably mounted on a common bearing journal.
  • both the pivoting lever carrying the drivable tensioning wheel and the rocker carrying the idler wheel are pivotably mounted on a single journal.
  • the rotating wheel mounted on the seesaw When tensioning the strapping by the contact pressure coming from the drivable tensioning wheel and acting on the rotating wheel, it can be converted into a release position against the action of the spring, in which the drivable advancing and retracting wheel and the associated rotating wheel for freely tensioning the strapping with one of the Thickness of the strapping band are spaced from each other.
  • a stop can be assigned to the rocker to limit the pivoting movement into the release position. This prevents the rocker from pivoting too far beyond the release position in a simple manner.
  • the rocker can be assigned a switch that can be actuated when the release position is reached and has a timing relay for switching off the motor from the tensioning wheel.
  • the rocker actuates a switch with a timing relay that switches off the motor for the tensioning wheel.
  • the time relay can be adjusted in a simple manner, so that after the switch is actuated, a predetermined period of time passes until the motor of the tensioning wheel is switched off. This period of time thus determines the magnitude of the tension that is generated in the strapping band. The longer the time span, the greater the tension in the strapping band.
  • the rocker can also be assigned an energy store which can be loaded in the pivoting direction and is provided with an adjustable preload, and a switch which can be actuated when the release position is reached for switching off the motor from the tensioning wheel.
  • an energy store which can be loaded in the pivoting direction and is provided with an adjustable preload
  • a switch which can be actuated when the release position is reached for switching off the motor from the tensioning wheel.
  • the energy storage which can be loaded by the rocker in the pivoting direction can be formed by a helical compression spring which is supported at one end against a piston which is in contact with a stop and is in active connection with the rocker and at the other against a slide which is adjustable in the direction of loading.
  • the helical compression spring forming the energy accumulator can thus be set to the desired pretension in a simple manner and the tension in the strapping band can thus be brought to the desired size.
  • the adjustable slide bearing against the helical compression spring can have on its side facing away from the helical compression spring a wedge surface for engaging a ball, which can be adjusted with a threaded spindle transversely to the direction of loading of the helical compression spring on the wedge surface of the slide. With the threaded spindle running transversely to the direction of loading of the helical compression spring, the ball on the wedge surface of the slide can thus be adjusted and the desired preload can thus be applied to the helical compression spring in a simple and reliable manner.
  • the feed and tensioning device shown in the drawing for a strapping band 10 to be tightened around a package has a pair of wheels 11, 12 which receive the strapping band non-positively between it and with which the strapping band 10 surrounds the package to be strapped at a distance , tape guide, not shown, can be advanced. By reversing the direction of rotation of the pair of wheels 11, 12, the strapping can then be brought into contact with the package by pulling back while holding the front end of the strap. After the strapping 10 has been placed against the package, the strapping 10 can then be provided with the required tension using a special tensioning wheel which is driven by itself.
  • the strapping 10 is tensioned with a pair of wheels 12, 13, of which one wheel 12 is designed as a rotating wheel and the wheel 13 can be rotated in the tensioning direction with a motor (not shown).
  • the tensioning wheel 13 is mounted with its axis 14 in a swivel lever 15 such that when the strapping 10 is tensioned, the drivable tensioning wheel 13 bears against the strapping 10, which is supported against the moving wheel 12, with an increasing contact force in the strapping 10 corresponding to the increasing tension:
  • the direction of rotation of the driven tensioning wheel 13 is such that a force component occurs in the sense of a pushing apart of the two wheels 12, 13, but this force component is smaller than that of the swivel lever 15 is the contact pressure caused by the belt tension.
  • the force component can be very small, since it is important that the contact pressure caused by the swivel lever 15 due to the belt tension is not also increased by the force component caused by the direction of rotation of the tensioning wheel 13.
  • the drivable tensioning wheel 13 is provided on its metallic outer surface 16 with a cord or the like, not shown, which increases the coefficient of friction. Furthermore, the circumferential surface 17 of the rotating wheel 12 which comes into contact with the strapping band 10 is formed by an abrasion-resistant, soft-elastic pad 18.
  • the tensioning wheel 13 is pressed against the strapping band supported by the rotating wheel 12, the tensioning wheel 13 with the strapping band 10 lying thereon is pressed into the abrasion-resistant, soft-elastic support 18, so that a large-area contact of the strapping band 10 both on the rotating wheel 12 and on the tensioning wheel 13 he follows. Damage to the strapping 10, in particular made of plastic, is thus avoided in a simple manner.
  • the pressing of the drivable tensioning wheel 13 mounted on the swivel lever 15 against the strapping band 10 supported by the rotating wheel 12 takes place against the action of a spring 19 acting on the swivel lever 15.
  • the spring 19 is designed as a coil tension spring and one end with a hook 20 at the free end of the Swivel lever 15 and otherwise held with a hook 21 on a fixed stop surface 22.
  • the force of the spring 19 causes the swivel lever 15 and thus the tensioning wheel 13 to assume a basic position in which the drivable tensioning wheel 13 and the associated idler wheel 12 are arranged for the free advancement of the strapping band 10 at a distance from one another which exceeds the thickness of the strapping band 10 are.
  • the pivoting lever 15 carrying the drivable tensioning wheel 13 bears against the fixed abutment surface 22 with an adjustable stop 23.
  • the adjustable stop 23 is formed by a screw 24 with a lock nut 25.
  • the screw 24 rests with its head against the fixed stop surface 22 and can be adjusted according to the given conditions.
  • the drivable tensioning wheel 13 mounted on the pivoting lever 15 assumes the basic position before tensioning when the strapping band 10 is advanced.
  • a pair of wheels 11, 12, which holds the strapping 10 non-positively between it, is provided for advancing and retracting the strapping band 10.
  • This pair of wheels 11, 12 is formed by a feed and retraction wheel 11 which can be driven in both directions of rotation with its own motor (not shown in more detail) and the co-rotating wheel 12 which also cooperates with the tensioning wheel 13.
  • the idler wheel 12 is rotatably mounted on the one swivel arm 26 of a rocker 27, on which also acts a helical compression spring 29, under the action of which the rocker 27 is held in a basic position in which the idler wheel 12 is non-positively locked against the push-on push-pull. and pulling back wheel 11 supports strapping 10.
  • the rotating wheel 12 is thus pressed by the spring-loaded rocker 27 against the feed and retraction wheel 11, so that the strapping 10 is clamped non-positively between the wheels 11 and 12.
  • the drivable feed and retraction wheel 11 has a polished, metallic outer surface 30, so that only a small amount of friction occurs between the feed and retraction wheel 11 and the strapping 10.
  • the force transmitted to the strapping band 10 is sufficient to advance the band into the band guide which encloses the package to be strapped at a distance.
  • the force is also sufficient to bring the strapping 10 into contact with the package by retracting the direction of rotation of the feed and retraction wheel 11 by retracting the front strap end.
  • the pivoting lever 15 carrying the drivable tensioning wheel 13 and the rocker 27 carrying the rotating wheel 12 are pivotably mounted on a common bearing journal 31.
  • a single journal 31 is used for the two pivotable parts 15 and 27.
  • the rotating wheel 12 mounted on the rocker is, as can be seen in particular from FIG. 2, when tensioning the strapping by the coming from the driven tension wheel 13 and against the action of the spring 29, the contact pressure acting on the idler wheel 12 is transferred to a release position in which the drivable advancing and retracting wheel 11 and the associated idler wheel 12 for free tensioning of the strap 10 are arranged at a distance from one another which exceeds the thickness of the strap 10 are. As a result, the tensioning of the strapping by the advancing and retracting wheel 11 is not impaired in a simple manner.
  • the rocker 27 is assigned a stop 32 which interacts with the first swivel arm 26 to limit the swivel movement into the release position. This prevents the rocker 27 from pivoting too far beyond the release position in a simple manner.
  • the stop 32 is assigned a switch 33 with an adjustable timing relay, not shown, with which the motor of the tensioning wheel 13, not shown, can be switched off.
  • the strapping band 10 When the device is used as intended, the strapping band 10 is first pushed with the strapping band 10 non-positively between the pair of wheels 11, 12 which receive it into the band guide which encloses the package to be strapped at a distance.
  • the device assumes the basic position shown in FIG. 1, in which the rotating wheel 12 with the spring-loaded rocker 27 is pressed non-positively against the strapping band 10 which is supported against the advancing and retracting wheel 11.
  • a distance is provided between the idler wheel 12 and the tensioning wheel 13 so that the strapping band can be pushed freely between these two wheels 12 and 13. Since the strapping band 10 wraps around the idler wheel 12 and the tensioning wheel 13, the idler wheel 12 is assigned a tape guide 37 and the tensioning wheel 13 is assigned a tape guide 38.
  • the two band leaders 37 and 38 are held on the rocker 27.
  • the strapping 10 is pulled back while holding the front end of the strapping so that the strapping 10 bears against the package.
  • the strapping 10 is retracted with the feed and retraction wheel 11, for which purpose the associated drive motor is driven in the opposite direction of rotation.
  • the motor for the feed and retraction wheel 11 is switched on in the retraction direction
  • the motor for the tensioning wheel 13 is also switched on at the same time, so that the tensioning wheel 13 rotates in the tensioning direction.
  • the tensioning wheel 13 with its own motor is rotated with a lower number of revolutions and greater force.
  • the tensioning wheel 13 mounted on the swivel lever 15 is transferred against the action of the spring 19 from the basic position into the operative position, in which the tensioning wheel 13 first comes into contact with the strapping band 10 and then with the strapping band 10 against the rotating wheel 12. Further retraction of the strapping 10, i.e. H. the strapping 10 is now tensioned with the tensioning wheel 13. Initially, the advancing and retracting wheel 11 with the strapping 10 is in contact. Due to the contact pressure of the tensioning wheel 13 against the rotating wheel 12, however, the rocker 27 is moved from the basic position into the release position against the action of the spring 29.
  • Adjusting the tension in the strapping with the adjustable time relay is difficult for the operator, since the values have to be gained through experience. If the strapping length of the strapping is changed and packages made of a different material, different time periods must be set again. To avoid this, the motor can also be switched off as a function of the belt tension currently prevailing in the belt.
  • the second swivel arm 28 of the rocker 27 is assigned an energy store 34 which can be loaded in the swivel direction and is provided with an adjustable preload. The transfer of the rocker 27 into the release position thus takes place against the action of an energy store 34 provided with an adjustable preload, so that the force of the energy store 34 must first be overcome. before the switch 33 is operated.
  • the switch 33 works in this case without a timing relay.
  • the energy store 34 which can be loaded by the rocker 27 in the pivoting direction, is formed by a helical compression spring, which is supported at one end against a piston 35 which bears against a stop 36 and is in active connection with the rocker 27 and at the other end against a slide 39 which can be adjusted in the direction of loading.
  • the piston 35, the helical compression spring 34 and the slide 39 are slidably arranged in a housing 40 which is held on the stop wall 22.
  • the stop 36 for the piston 35 is formed by a spring ring which is inserted in an annular groove of the cylindrical housing 40, which is not designated in any more detail.
  • the piston 35 protrudes from the housing 40 with a stepped shoulder 41 and comes into operative connection with the second pivot arm 28 of the rocker 27 in order to brake the pivoting movement of the rocker 27 into the release position, depending on the band tension currently prevailing in the strapping band.
  • the adjustable slide 39 bearing against the helical compression spring 34 has on its side facing away from the helical compression spring 34 a wedge surface 42 for the abutment of a ball 43, which can be adjusted with a threaded spindle 44 transversely to the loading direction of the helical compression spring 34 on the wedge surface 42 of the slide 39.
  • the ball 43 on the wedge surface 42 of the slide 39 can thus be adjusted with the threaded spindle 44, which causes a displacement of the slide 39.
  • the bias of the helical compression spring 34 is changed by the displacement of the slide 39 and thus the force is changed which counteracts the pivoting of the rocker 27 into the release position.
  • the pivoting of the rocker 27 thus takes place in dependence on the band tension prevailing in the strapping band against the action of the energy store 34, so that an exact setting of the band tension is possible in order to effect the switch 33 for switching off the motor from the tensioning wheel 13.
  • the overlapping ends of the band can now be connected to one another and the part of the strapping excess for strapping the package can be separated.
  • the devices required for this can have a structure known per se and have therefore not been explained in more detail. After cutting off the excess part of the strapping for strapping the package, the strapping can now be pushed forward again.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Basic Packing Technique (AREA)
  • Tension Adjustment In Filamentary Materials (AREA)
  • Knitting Machines (AREA)
EP83104801A 1982-05-29 1983-05-16 Vorschub- und Spannvorrichtung für ein um ein Packstück zu spannendes Umreifungsband Expired EP0095643B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT83104801T ATE34351T1 (de) 1982-05-29 1983-05-16 Vorschub- und spannvorrichtung fuer ein um ein packstueck zu spannendes umreifungsband.
CA000452132A CA1221571A (en) 1983-05-02 1984-04-16 Method of reproducing images with grey values

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3220446 1982-05-29
DE19823220446 DE3220446A1 (de) 1982-05-29 1982-05-29 Vorschub- und spannvorrichtung fuer ein um ein packstueck zu spannendes umreifungsband

Publications (3)

Publication Number Publication Date
EP0095643A2 EP0095643A2 (de) 1983-12-07
EP0095643A3 EP0095643A3 (en) 1986-05-28
EP0095643B1 true EP0095643B1 (de) 1988-05-18

Family

ID=6164916

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83104801A Expired EP0095643B1 (de) 1982-05-29 1983-05-16 Vorschub- und Spannvorrichtung für ein um ein Packstück zu spannendes Umreifungsband

Country Status (4)

Country Link
US (1) US4516488A (enrdf_load_stackoverflow)
EP (1) EP0095643B1 (enrdf_load_stackoverflow)
AT (1) ATE34351T1 (enrdf_load_stackoverflow)
DE (2) DE3220446A1 (enrdf_load_stackoverflow)

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SE7603434L (sv) 1975-05-09 1976-11-10 Hoesch Werke Ag Bandspennanordning for ombindningsmaskiner
DE2537443A1 (de) 1975-08-22 1977-03-03 Joachim Helff Verfahren eines integrierten antriebes fuer das eintreiben, zurueckziehen, spannen und verschliessen von bindemittel
US4218969A (en) * 1979-02-01 1980-08-26 Nichiro Kogyo Company, Limited Band feeding and tightening apparatus for strapping machine
DE2906756A1 (de) * 1979-02-21 1980-09-04 Nichiro Kogyo Kk Verfahren und vorrichtung zum zufuehren und spannen eines spannbandes
US4212238A (en) * 1979-03-05 1980-07-15 Interlake, Inc. Rotary dog assembly

Also Published As

Publication number Publication date
DE3220446C2 (enrdf_load_stackoverflow) 1988-05-19
EP0095643A2 (de) 1983-12-07
ATE34351T1 (de) 1988-06-15
EP0095643A3 (en) 1986-05-28
DE3376639D1 (en) 1988-06-23
US4516488A (en) 1985-05-14
DE3220446A1 (de) 1984-01-26

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