EP0733549B1 - Dispositif pour tendre un lien - Google Patents

Dispositif pour tendre un lien Download PDF

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Publication number
EP0733549B1
EP0733549B1 EP96103500A EP96103500A EP0733549B1 EP 0733549 B1 EP0733549 B1 EP 0733549B1 EP 96103500 A EP96103500 A EP 96103500A EP 96103500 A EP96103500 A EP 96103500A EP 0733549 B1 EP0733549 B1 EP 0733549B1
Authority
EP
European Patent Office
Prior art keywords
pressure
line
tensioning
valve
piston
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 - Lifetime
Application number
EP96103500A
Other languages
German (de)
English (en)
Other versions
EP0733549A1 (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 by means of a spring-loaded changeover valve when a predetermined pressure is reached on Clamping drive releases the pressure medium supply to the actuating drive.
  • the invention has for its object to increase the repeatability. That applies especially for low band tensions in the order of a few DekaNewton, as they are needed for example in medical technology. This should be as short as possible Cycle time can be achieved.
  • the valve arrangement comprises, on the one hand, a stand-in reducing valve connected to the tensioning drive via a pressure medium supply line and a throttle in the pressure medium supply line .
  • the pressure medium-operated changeover valve connected to the actuation drive which is acted upon by the differential pressure across the throttle according to the invention , releases the pressure medium supply to the actuation drive when the set belt tension is reached.
  • the A position de r clamping force happens by adjusting the reducing valve.
  • this has the effect that the pressure on the tensioning drive first proceeds quickly and then slowly as the end pressure increases in proximity.
  • 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 operation of the changeover valve does not go by the measurement of the pressure to be achieved that corresponds to the voltage to be achieved band, but by the measurement of differential pressure in the pressure medium supply line for 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 decreases 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 is set to the reducing pressure which is a little greater than the band tension to be achieved, namely by the amount of pressure which is generated by the force of the spring on the piston of the changeover valve. Is then the release of the actuating drive when a predetermined is reached by the construction of Umsshaltventils and the force of its spring difference between the pressures in the supply line for the tensioning drive in front and behind the throttle. 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 therefore does not impair the repeatability of the set strap tensioning because it is the same with every tensioning process.
  • the device can be operated with an independent measuring device of the tensioning pressure and to display the resulting tape tension.
  • the housing of the tool forms an elongated tool body 1 and one on it pistol-like handle 2.
  • the tool body contains a pneumatic one Cylinder 3 through a front disc 4 and a rear disc 5 to the Ends tightly closed.
  • It contains a first piston 6, which has a piston rod 7 with a collet 8 for gripping the end of a band to be tensioned connected is.
  • 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 formed by the hollow Piston rod 7 is guided and its front end acts on a pair of levers 11, 12 that 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 they are known is.
  • a space 14 in which one Means not shown for measuring the in the cylinder 3 between the disc 4th and the cylinder 6 prevailing pressure is arranged.
  • a display In the rear open end of the Room 14 is a display that shows the measurement result in the form of this Pressure achieved tape tension indicates.
  • the valve arrangement through which the pressure medium supply to the cylinder 3 is controlled.
  • the work cycle is started by a power button 15 which acts on a switch-on valve 16.
  • the reducing pressure of the reducing valve 17 can be by means of an adjusting screw 18 can be adjusted.
  • 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 pressed against the spring force 29 by pressing the button 15 are moved to the position shown in Figure 2, in which the supply line 20 is connected to line 21.
  • the button 15 is released, the slide arrives in the position shown in Figure 4, in which the line 21 from the supply line 20 is separated and connected to a vent 39 while the supply line is connected to a line 37 leading to the cylinder 3, to a point which is still between the two pistons 6 and 9 when both are working have gone through completely.
  • the button 15 pressed and see the Slider of the on-off valve 16 in the on position (FIG. 2) this is line 37 vented through the opening 38 of the on-off 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, specifically preferably near the cylinder 3. It can be carried out in a simple manner by that the inlet bore in the cylinder wall 3 is made with a clear diameter which is smaller than that of the pressure medium supply line 23. For example, this has (just like all other lines specified in the arrangement) a clear diameter from 2 to 3mm, while the throttle bore 24 has a diameter of 0.6mm having.
  • 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 supported by a spring 26 applied, which is usually set to an unchangeable value.
  • This Spring 26 and the pressure acting in line 25 endeavor to slide the reducing valve 17 in the drawing to move down, so that with the inlet bore the branch line 22 cooperating control edge of the slide to close it seeks.
  • a spring acts on the opposite end face of the slide of the reducing valve 17 27, the spring force of which can be adjusted by means of a screw 28 with button 18.
  • the slide of the reducing valve 17 adjusts itself so that the Line 25 acting on the slide reduced pressure with the spring 26 on the one hand and the On the other hand, force of the spring 27 balances 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. Gives way to the reduced Pressure from the setpoint upwards, the inlet opening of the branch line 22 becomes corresponding more closed.
  • the springs 26 and 27 are sized so that the desired Adjustment range of the reduced pressure is achieved.
  • the one connected to the supply pressure when the on-off valve 16 is switched on Line 21 is connected to the changeover valve 19 via the branch line 30. Furthermore, the changeover valve 19 is connected to a region of the face via the line 31 Reducing valve 17 connected, which constantly contains the reduced pressure. Thereby the reduced pressure acts on the front of the Switch of the switch valve 19.
  • the other face of the switch of the switch valve 19 is connected via line 32 to the cylinder 3, specifically at one point the same, which is close to the mouth of the pressure medium supply line 23 but in the initial state of the piston 6 is blocked off from its peripheral surface, so that at the beginning of the working cycle through the pressure medium supply line 23 pressure supplied to the cylinder can not immediately tell the line 32.
  • 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 each other and therefore the supply pressure does not act on cylinder 3 via line 34. In this position it is due to the pressure acting on the lower side of the slide via line 31 transferred.
  • the spring 33 and the line 32 on the top of the slide acting pressure tends to put the slide in a position in which the lines 30 and 34 are interconnected. If the top and bottom faces of the slide of the changeover valve 19 are the same size, the slide is thus from the Difference of the pressures acting in line 31 and line 32 and additionally by the spring 33 is loaded.
  • the changeover valve 19 also has a vent opening 35 which is connected to line 34 when it is not connected to line 30 connected is.
  • the cylinder 3 has a vent 36 at a point which in the initial state and is blocked by the piston 6 during the stroke and is then released, when it has reached the maximum stroke.
  • the supply pressure 20 acts on the reducing valve 17 via line 21, 22 reduced pressure acts on the pressure medium supply line 23 on the left in the drawing illustrated side of the piston 6 and via the line 31 to the lower end of the Slider of the changeover valve 19.
  • the upper face of this slide is not yet acted upon by the reduced pressure because the mouth of line 32 into the cylinder 3 is still blocked by the piston 6.
  • the one on the lower face of the slide of the changeover valve 19 acting pressure moves the slide against the spring 33 upwards, whereby line 30 carrying the supply pressure from line 34 to cylinder 3 is cordoned off.
  • the reduced pressure also acts on the upper end face via line 25 the slide of the reducing valve 17, as required for its reducing function is.
  • the pressure acting in the cylinder 3 to the left of the piston 6 corresponds to that at every moment Force exerted by the band to be tensioned on the piston against its direction of movement is exercised.
  • This force increases with the progress of tension; the pressure in the cylinder 3 also increases accordingly Speed at which the pressure medium flows into the cylinder and thus also at the Throttle 24 acting pressure difference.
  • the difference in the Forces exerted on the slide of the switching valve 19 by the pressures that can be exercised via the lines 31 and 32 on its opposite end faces If this difference in force is smaller than the force exerted by the spring 33, it is displaced the slide until it opens the changeover valve and thereby the supply pressure above Line 34 the space in the cylinder 3 between the piston 9 and the rear End plate 5 is communicated.
  • the piston 9 is shifted to the left, causing the Cutting device is operated.
  • the pressure in cylinder 3 must be measured at that time in which the clamping process is ended. Expediently for the measurement is a short, predetermined period of time after triggering the cutting process provided, the highest measured pressure within this period determined, stored and displayed as authoritative.
  • the lever 11 or 12 may be arranged a microswitch which indicates the start of the measurement period indicates. The duration of this period is set to be one after exiting during the tensioning process, the pressure may no longer increase is 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)

Claims (2)

  1. Outil pour serrer un lien et peur actionner un fermoir de lien et/ou pour couper le lien à la fin de l'opération de serrage, comportant une commande de serrage (3, 6) mûe par un fluide sous pression et un actionneur (3, 9) mû par un fluide sous pression, ainsi qu'un système de soupapes (17, 19) qui autorise l'arrivée du fluide sous pression à l'actionneur (3, 9) lorsqu'une pression prédéterminée est atteinte sur la commande de serrage (3, 6), et qui comprend une soupape de commutation (19) sollicitée par la pression s'appliquant sur la commande de serrage (3, 6), caractérisé en ce que le système de soupapes comprend un détendeur réglable (17), relié à la commande de serrage (3, 6) par l'intermédiaire d'un conduit d'amenée de fluide sous pression (23), en ce que le conduit d'amenée de fluide sous pression (23) renferme un étranglement (24), et en ce que la soupape de commutation (19) est sollicitée par la différence des pressions règnant de part et d'autre de l'étranglement (24).
  2. Outil selon la revendication 1, caractérisé en ce qu'il est prévu un dispositif destiné à mesurer las pression pour le serrage et à indiquer la tension, ainsi obtenue, du lien, ce dispositif étant indépendant du dispositif de limitation de la tension du lien.
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 EP0733549A1 (fr) 1996-09-25
EP0733549B1 true 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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1231140A1 (fr) 2001-02-12 2002-08-14 Hellermann Tyton GmbH Outil de cerclage

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2243854T3 (es) * 1996-08-28 2005-12-01 THOMAS & BETTS CORPORATION Util para instalar elementos de sujecion de cables.
DE19742293C2 (de) * 1997-09-25 1999-08-26 Raymond A & Cie Gerät zum Spannen und Abschneiden von Kabelbindern
US6457492B1 (en) * 2000-07-26 2002-10-01 Thomas & Betts International, Inc. Semi-automatic cable tie application tool
US6840289B2 (en) * 2002-10-29 2005-01-11 Panduit Corp. Pneumatic cable tie tool
EP3892552B1 (fr) * 2020-04-08 2022-08-31 Yang Bey Industrial Co., Ltd. Outil d'emballage pouvant afficher la tension

Family Cites Families (8)

* 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
US3254680A (en) * 1963-12-18 1966-06-07 Panduit Corp Strap tensioning tool
GB1140806A (en) * 1966-10-27 1969-01-22 B S Palmer & Company Ltd Band tensioning tool
US3865156A (en) * 1973-09-17 1975-02-11 Panduit Corp Powered strap tensioning and severing tool
US3863684A (en) * 1973-11-23 1975-02-04 Interlake Inc Strapping tool
US4192358A (en) * 1978-08-21 1980-03-11 Dennison Manufacturing Company Air powered installation of fasteners
DE3175471D1 (en) * 1980-02-27 1986-11-20 Bowthorpe Hellermann Ltd Automatic tie gun
FR2542388B1 (fr) * 1983-03-10 1985-08-16 Caillau Ets Appareil pour la commande automatique successive d'au moins deux processus ou operations

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1231140A1 (fr) 2001-02-12 2002-08-14 Hellermann Tyton GmbH Outil de cerclage

Also Published As

Publication number Publication date
DE29504940U1 (de) 1996-07-18
DE59600255D1 (de) 1998-07-16
US5630450A (en) 1997-05-20
EP0733549A1 (fr) 1996-09-25

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