EP0733549A1 - Dispositif pour tendre un lien - Google Patents

Dispositif pour tendre un lien Download PDF

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Publication number
EP0733549A1
EP0733549A1 EP96103500A EP96103500A EP0733549A1 EP 0733549 A1 EP0733549 A1 EP 0733549A1 EP 96103500 A EP96103500 A EP 96103500A EP 96103500 A EP96103500 A EP 96103500A EP 0733549 A1 EP0733549 A1 EP 0733549A1
Authority
EP
European Patent Office
Prior art keywords
pressure
tensioning
valve
drive
line
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.)
Granted
Application number
EP96103500A
Other languages
German (de)
English (en)
Other versions
EP0733549B1 (fr
Inventor
Viktor Dipl.-Ing. Kurmis
Hans-Dieter Dipl.-Ing. Thieme
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.)
Paul Hellermann GmbH
Original Assignee
Paul Hellermann GmbH
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 Paul Hellermann GmbH filed Critical Paul Hellermann GmbH
Publication of EP0733549A1 publication Critical patent/EP0733549A1/fr
Application granted granted Critical
Publication of EP0733549B1 publication Critical patent/EP0733549B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B65B13/185—Details of tools
    • B65B13/187—Motor means
    • B65B13/188—Motor means pneumatic or hydraulic

Definitions

  • the invention relates to a tool for tensioning a strap and for actuating a strap closure and / or for cutting the strap at the end of the tensioning process, which has a pressure-medium-operated tensioning drive, a pressure-medium-operated actuation drive and a valve arrangement which, when reaching a predetermined pressure on the tensioning drive, the pressure medium supply to Actuating drive releases.
  • the invention has for its object to increase the repeatability. This applies in particular to low band tensions in the order of a few DekaNewton, as are required, for example, in medical technology. This should be achieved with the shortest possible cycle time.
  • the solution according to the invention consists in that the valve arrangement comprises on the one hand a reducing valve which is connected to the tensioning drive via a pressure medium supply line and which can be adjusted to the reducing pressure corresponding to the desired belt tension, the pressure medium supply line containing a throttle.
  • the valve arrangement comprises a pressure medium-operated changeover valve connected to the actuating drive.
  • the tensioning drive is adjusted by adjusting the reducing valve.
  • this has the effect that the pressure at the tensioning drive is rapid at first and then slowly as the final pressure approaches.
  • the pressure measurement that takes place to actuate the changeover valve takes place in the last, less steep area of the pressure rise, which improves the accuracy, as well for small as for large band tension settings.
  • the steep rise in pressure in the first part means that the process takes place quickly. Regardless of the set belt tension, you can achieve both a short cycle time and good conditions for a precise determination of the pressure level at which the switchover is to take place.
  • the actuation of the changeover valve does not start from the measurement of the pressure to be achieved, which corresponds to the belt tension to be achieved, but from the measurement of the differential pressure in the pressure medium supply line to the tensioning drive.
  • the throttle in the feed line to the tensioning drive is flowed through quickly and a comparatively large pressure difference is established. This causes the changeover valve to be held in the blocking position.
  • the pressure medium flow decreases. As a result, the pressure difference drops until it is no longer sufficient to balance the spring acting in the release direction, and the pressure medium supply to the actuating drive is released.
  • the reducing valve can be set to the pressure which corresponds to the belt tension to be achieved, this is therefore only approximately true.
  • the actuation drive is released when a difference between the pressures in the supply line to the tensioning drive in front of and behind the throttle, which is predetermined by the design of the changeover valve and the force of its spring, is reached. This is taken as a sign that the pressure set on the reducing valve on the tensioning drive has almost been reached.
  • the possible deviation of the pressure actually prevailing at the tensioning drive from the set reducing pressure does not impair the repeatability of the set strap tension because it is the same with every tensioning process. It has been shown that a very high repeatability is possible with the device according to the invention. The deviations were less than 2 N for a device that had an adjustment range for the belt tension of 40 to 260 N. This repeatability is orders of magnitude better than can be achieved with previously known mechanically or pneumatically operated tools.
  • the device can be equipped with an independently operating device for measuring the tensioning pressure and for displaying the resulting tape tension.
  • the housing of the tool forms an elongated tool body 1 and a handle 2 arranged thereon like a pistol.
  • the tool body contains a pneumatic cylinder 3, which is sealed off at the ends by a front disk 4 and a rear disk 5. It contains a first piston 6, which is connected via a piston rod 7 to a collet 8 for gripping the end of a band to be tensioned.
  • the piston rod 7 is tightly guided through the disc 4.
  • It also contains a second piston 9 with a piston rod 10 which is tightly guided through the hollow piston rod 7 and whose front end acts on a pair of levers 11, 12 which acts on a cutting blade 13 at the front end.
  • the arrangement and mode of operation of the collet 8 and the cutting blade 13 require no further explanation because it is known.
  • a space 14 in which a device (not shown in more detail) for measuring the pressure prevailing in the cylinder 3 between the disk 4 and the cylinder 6 is arranged.
  • a display which shows the measurement result in the form of the belt tension achieved by this pressure.
  • the valve arrangement through which the pressure medium supply to the cylinder 3 is controlled.
  • the work cycle is started by a switch 15 which acts on a switch 16.
  • the reducing pressure of the reducing valve 17 can be set by means of an adjusting screw 18.
  • the switchover valve is provided at 19.
  • a connection device for a flexible compressed air line is arranged. Normal air pressure of, for example, 6 bar can be used.
  • the slide of the on-off valve 16 can be moved against spring force 29 by pressing the button 15 into the position shown in FIG. 2, in which the supply line 20 is connected to the line 21.
  • the slide reaches the position shown in FIG. 4, in which the line 21 is separated from the supply line 20 and connected to a vent 39, while the supply line is connected to a line 37 leading to the cylinder 3 leads, and to a point that is still between the two pistons 6 and 9 when both have completed their working stroke. If the button 15 is pressed and the slide of the switch-on valve 16 is in the switch-on position (FIG. 2), this line 37 is vented via the opening 38 of the switch-on valve 16.
  • a line 21 leads from the on-off valve 16 via branch 22 to the reducing valve 17.
  • the reduced pressure is supplied to the cylinder 3 via the pressure medium supply line 23, namely between the front end plate 4 and the piston 6 in its initial position.
  • a throttle 24 is provided in the pressure medium supply line 23, preferably close to the cylinder 3. It can be carried out in a simple manner by producing the inlet bore in the cylinder wall 3 with a clear diameter that is smaller than that of the pressure medium supply line 23. For example, this (like all other lines specified in the arrangement) has a clear diameter of 2 to 3 mm, while the throttle bore 24 has a diameter of 0.6 mm.
  • a branch line 25 leads from the pressure medium supply line 23 to the end face of the slide of the reducing valve 17.
  • this side of the slide is acted upon by a spring 26, which is generally set to an invariable value.
  • This spring 26 and the pressure acting in the line 25 endeavor to move the slide of the reducing valve 17 downward in the drawing, so that the control edge of the slide interacting with the inlet bore of the branch line 22 tries to close it.
  • a spring 27 acts on the opposite end face of the slide of the reducing valve 17, the spring force of which can be adjusted by means of a screw spindle 28 with a button 18.
  • the inlet opening of the branch line 22 is open.
  • the slide of the reducing valve 17 adjusts itself so that the reduced pressure acting on the slide via the line 25 with the spring 26 on the one hand and the force of the spring 27 on the other hand balance each other. If the reduced pressure drops, the control edge of the slide opens the inlet opening of the branch line 22 a little, so that more compressed air enters the pressure medium supply line 23. If the reduced pressure deviates upwards from the target value, the inlet opening of the branch line 22 is closed correspondingly more strongly.
  • the springs 26 and 27 are dimensioned so that the desired setting range of the reduced pressure is achieved.
  • the line 21 connected to the supply pressure in the switched-on state of the switch-on valve 16 is connected to the changeover valve 19 via the branch line 30. Furthermore, the changeover valve 19 is connected at the end via the line 31 to a region of the reducing valve 17 which constantly contains the reduced pressure. As a result, the reduced pressure acts on the end face of the slide of the changeover valve 19 which appears in the drawing below.
  • the other end face of the slide of the changeover valve 19 is connected to the cylinder 3 via line 32, to a point at the same point as the mouth of the pressure medium supply line 23 is close but is blocked in the initial state of the piston 6 from its circumferential surface, so that the pressure supplied to the cylinder through the pressure medium supply line 23 at the beginning of the work cycle cannot yet be immediately communicated to the line 32. Only after a small displacement of the piston 6 to the right is the pressure acting in the cylinder 3 on the left side of the piston 6 communicated via the line 32 to the upper end of the slide in the changeover valve 19, so that it via the line 31 to the lower end face counteracts acting reduced pressure.
  • a spring 33 acts on the upper end face of the slide of the changeover valve 19, the force acting on the slide is generally set to a certain, unchangeable value.
  • the changeover valve 19 is finally connected to the cylinder 3 via line 34, to a point which, in the starting position of the second piston 9, lies between the latter and the rear end plate 5 of the cylinder.
  • the slide of the changeover valve 19 can assume a first position, shown in FIG. 2, in which the lines 30 and 34 are not connected to one another and therefore the supply pressure does not act on the cylinder 3 via line 34. In this position it is set by the pressure acting on the lower side of the slide via line 31.
  • the spring 33 and the pressure acting on the upper side of the slide via the line 32 endeavor to move the slide into a position in which the lines 30 and 34 are connected to one another. If the upper and lower end faces of the slide of the changeover valve 19 are of the same size, the slide is thus acted upon by the difference between the pressures acting in the line 31 and the line 32 and also by the spring 33.
  • the changeover valve 19 also has a vent opening 35, which is connected to the line 34 when it is not connected to the line 30.
  • the cylinder 3 has a vent 36 at a location which is blocked by the piston 6 in the initial state and during the stroke and is released when the piston 6 has completed the maximum stroke.
  • the supply pressure 20 acts via line 21, 22 on the reducing valve 17.
  • the reduced pressure acts via the pressure medium supply line 23 on the side of the piston 6 shown on the left in the drawing and via line 31 on the lower end face of the slide of the changeover valve 19.
  • the upper one The front face of this slide is not yet acted upon by the reduced pressure because the mouth of the line 32 into the cylinder 3 is still blocked by the piston 6.
  • the pressure acting on the lower end face of the slide of the changeover valve 19 moves the slide upward against the spring 33, as a result of which the line 30 carrying the supply pressure is shut off from the line 34 to the cylinder 3.
  • the reduced pressure also acts on the upper end face of the slide of the reducing valve 17, as is necessary for its reducing function.
  • the pressure acting in the cylinder 3 to the left of the piston 6 corresponds at any moment to the force exerted on the piston against the direction of movement by the band to be tensioned.
  • This force increases with the progress of tension; the pressure in the cylinder 3 also increases accordingly.
  • the speed at which the pressure medium flows into the cylinder and thus the pressure difference acting on the throttle 24 also decrease.
  • the difference in the forces exerted on the slide of the changeover valve 19 by the pressures exerted on its opposite end faces via the lines 31 and 32 also decreases correspondingly. If this difference in force is less than the force exerted by the spring 33, the slide moves until it opens the changeover valve and the supply pressure is communicated via line 34 to the space in the cylinder 3 between the piston 9 and the rear end plate 5.
  • the piston 9 is shifted to the left, whereby the cutting device is actuated.
  • the pressure in the cylinder 3 must be measured at the point in time at which the clamping process is ended.
  • a short, predetermined period of time is expediently provided for the measurement after the cutting process has been triggered, the highest measured pressure being determined, stored and displayed as decisive within this period.
  • a microswitch can be arranged on the lever 11 or 12, which indicates the start of the measurement period. The duration of this time period is set so that a pressure increase that may still take place after the end of the tensioning process is no longer detected.
  • the pressure measuring sensor can be connected to line 32.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
EP96103500A 1995-03-23 1996-03-06 Dispositif pour tendre un lien Expired - Lifetime EP0733549B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29504940U DE29504940U1 (de) 1995-03-23 1995-03-23 Werkzeug zum Spannen eines Bandes
DE29504940U 1995-03-23

Publications (2)

Publication Number Publication Date
EP0733549A1 true EP0733549A1 (fr) 1996-09-25
EP0733549B1 EP0733549B1 (fr) 1998-06-10

Family

ID=8005771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96103500A Expired - Lifetime EP0733549B1 (fr) 1995-03-23 1996-03-06 Dispositif pour tendre un lien

Country Status (3)

Country Link
US (1) US5630450A (fr)
EP (1) EP0733549B1 (fr)
DE (2) DE29504940U1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0905024A1 (fr) 1997-09-25 1999-03-31 A. Raymond & Cie Outil pour la mise sous tension et le sectionnement d'attaches de câbles
EP3892552A1 (fr) * 2020-04-08 2021-10-13 Yang Bey Industrial Co., Ltd. Outil d'emballage pouvant afficher la tension

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2250824T3 (es) * 1996-08-28 2006-04-16 THOMAS & BETTS CORPORATION Herramienta de instalacion de sujetacables.
MXPA02002168A (es) * 2000-07-26 2002-09-18 Thomas & Betts Int Herramienta semi-automatica de aplicacion de amarre de cable.
ATE247025T1 (de) 2001-02-12 2003-08-15 Hellermann Tyton Gmbh Bindewerkzeug
US6840289B2 (en) * 2002-10-29 2005-01-11 Panduit Corp. Pneumatic cable tie tool

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB896398A (en) * 1959-08-14 1962-05-16 Packers Supply Company Ltd Improvements in and relating to powered tools for applying binding strapping, wire and the like about articles
US3508740A (en) * 1966-10-27 1970-04-28 Basil Stoddard Palmer Band tensioning tool
US3863684A (en) * 1973-11-23 1975-02-04 Interlake Inc Strapping tool

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3254680A (en) * 1963-12-18 1966-06-07 Panduit Corp Strap tensioning tool
US3865156A (en) * 1973-09-17 1975-02-11 Panduit Corp Powered strap tensioning and severing tool
US4192358A (en) * 1978-08-21 1980-03-11 Dennison Manufacturing Company Air powered installation of fasteners
EP0035368A1 (fr) * 1980-02-27 1981-09-09 P.A. Management Consultants Limited Liens flexibles
FR2542388B1 (fr) * 1983-03-10 1985-08-16 Caillau Ets Appareil pour la commande automatique successive d'au moins deux processus ou operations

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB896398A (en) * 1959-08-14 1962-05-16 Packers Supply Company Ltd Improvements in and relating to powered tools for applying binding strapping, wire and the like about articles
US3508740A (en) * 1966-10-27 1970-04-28 Basil Stoddard Palmer Band tensioning tool
US3863684A (en) * 1973-11-23 1975-02-04 Interlake Inc Strapping tool

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0905024A1 (fr) 1997-09-25 1999-03-31 A. Raymond & Cie Outil pour la mise sous tension et le sectionnement d'attaches de câbles
DE19742293A1 (de) * 1997-09-25 1999-04-08 Raymond A & Cie Spanngerät für Bindegurte von Kabelbündeln, Wellrohren u. dgl.
DE19742293C2 (de) * 1997-09-25 1999-08-26 Raymond A & Cie Gerät zum Spannen und Abschneiden von Kabelbindern
EP3892552A1 (fr) * 2020-04-08 2021-10-13 Yang Bey Industrial Co., Ltd. Outil d'emballage pouvant afficher la tension

Also Published As

Publication number Publication date
DE29504940U1 (de) 1996-07-18
US5630450A (en) 1997-05-20
DE59600255D1 (de) 1998-07-16
EP0733549B1 (fr) 1998-06-10

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