EP1716976A2 - Dispositif de retenue pour une pièce à travailler et système de serrage avec un tel dispositif de retenue - Google Patents

Dispositif de retenue pour une pièce à travailler et système de serrage avec un tel dispositif de retenue Download PDF

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Publication number
EP1716976A2
EP1716976A2 EP06002519A EP06002519A EP1716976A2 EP 1716976 A2 EP1716976 A2 EP 1716976A2 EP 06002519 A EP06002519 A EP 06002519A EP 06002519 A EP06002519 A EP 06002519A EP 1716976 A2 EP1716976 A2 EP 1716976A2
Authority
EP
European Patent Office
Prior art keywords
holding device
control member
clamping
workpiece
suction part
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
EP06002519A
Other languages
German (de)
English (en)
Other versions
EP1716976A3 (fr
EP1716976B1 (fr
Inventor
Denis Lorber
Jochen Stolz
Heinz Vogel
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.)
Holz Her GmbH
Original Assignee
Reich Spezialmaschinen 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 Reich Spezialmaschinen GmbH filed Critical Reich Spezialmaschinen GmbH
Publication of EP1716976A2 publication Critical patent/EP1716976A2/fr
Publication of EP1716976A3 publication Critical patent/EP1716976A3/fr
Application granted granted Critical
Publication of EP1716976B1 publication Critical patent/EP1716976B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
    • B25B11/005—Vacuum work holders

Definitions

  • the invention relates to a holding device for workpieces to be machined, with a suction part, which can be placed on a support base, which provides a negative pressure via a magnetically openable shut-off valve, and with a workpiece support, on which the workpiece is fixable.
  • the invention also relates to a vacuum clamping system with such a holding device and with a support base on which the holding device can be placed.
  • the holding device can be placed on the support base, and by means of a holding force, which is caused by the negative pressure provided by the support base, the workpiece to be machined can be fixed to the holding device, so that it can subsequently be processed.
  • a holding device in the form of a block suction known which can be placed on a support base in the form of a clamping bar.
  • the suction block can be sucked by the clamping bar by means of a negative pressure, which is provided by the clamping bar via a shut-off valve.
  • the shut-off valve comprises a magnetic valve body, and on the suction block a ferromagnetic plate is arranged on the underside, so that when placing the block suction on the clamping bar, the shut-off valve automatically opens due to the magnetic interaction of valve body and ferromagnetic plate, so that the suction block is sucked.
  • the suction block has a flow channel which extends from the bottom to the top of the block suction and receives a pressure control valve.
  • the workpiece to be machined can be placed on top of the block vacuum, and by increasing the negative pressure provided by the clamping bar, the pressure control valve can be opened, so that the workpiece is sucked to the top of the block vacuum.
  • two different negative pressures are therefore required.
  • a first negative pressure is used to set the block suction on the support base, and a second negative pressure, which is greater than the first negative pressure, is used to fix the workpiece on the block suction.
  • the negative pressure must be reduced again for this, and to release the block suction from the support base of the vacuum must be completely reduced.
  • a release of the block suction from the clamping bar is particularly necessary if the workpiece to be machined to be processed on different side surfaces. If, for example, a window frame is used as the workpiece, then it is often necessary to machine both the inside of the frame and the outside of the frame. This makes it necessary to change the arrangement of the block suction, for which purpose the vacuum provided in the clamping beam must be completely reduced.
  • Object of the present invention is to provide a holding device and a vacuum clamping system of the type mentioned in such a way that the holding device can be solved while maintaining a negative pressure in the support base of the support base and fixed elsewhere on the support base.
  • the holding device comprises a magnetic or magnetizable control member which is reciprocated on the suction member between an operating position and an inoperative position, wherein it has a smaller distance to the shut-off valve in the operating position as in the inoperative position.
  • the holding device can be solved at any time by the use of a magnetic or magnetizable control member while maintaining a negative pressure in the support base of this and fixed elsewhere on this, if the control member between an operating position and a non-operating position is movable back and forth, wherein it has a smaller distance to the shut-off valve of the support base in the operating position than in the inoperative position. Namely, by changing the distance of the control member, the magnetic shut-off valve of the support base can be operated. This gives the possibility to permanently provide a negative pressure in the support base.
  • the control member If the holding device is placed on the support base, the control member initially assumes its inoperative position, in which it has a considerable distance from the magnetic shut-off valve and consequently no sufficient magnetic force acts on the shut-off valve in order to open it.
  • the holding device has taken the desired position on the support base, the control member can be transferred to its operating position in which it has a relatively small distance from the shut-off valve, so that it opens automatically due to the strong magnetic interaction with the control member and consequently the suction of the Holding device is subjected to negative pressure.
  • the workpiece to be machined are fixed to the workpiece support of the holding device. If the holding device is to be removed again from the support base, then only the control element has to be transferred to its inoperative position for this purpose.
  • control member comprises at least one permanent magnet. It is advantageous if the control member has a plurality of, preferably in series one behind the other arranged permanent magnets.
  • the movement of the control member may be such that it is movable between a raised and a lowered position back and forth. It has proved to be particularly favorable when the control member is held pivotably. It can thus be pivoted back and forth between its operating position and its external operating position. It is particularly advantageous if the suction part comprises a pivot lever for pivoting the control member.
  • the pivot lever allows a particularly simple operation of the holding device.
  • the suction part defines a suction chamber, which opens into an underside of the suction part and in which the control member is movably held.
  • the suction chamber is surrounded by a sealing ring on the underside of the suction part. If the holding device is placed on the support base, the suction chamber is subjected to negative pressure as soon as the control member is transferred to its operating position, since then the check valve of the support base opens and thus there is a flow connection between the flow channel of the support base and the suction chamber.
  • control member is held on a pivotally mounted pivot shaft, which passes through the suction chamber. By pivoting the pivot shaft, the control member can be moved in a structurally simple manner between its operating position and its inoperative position back and forth.
  • the holding device comprises a ventilation device, via which the suction chamber can be ventilated in dependence on the position of the control member. This gives the possibility to ventilate the suction chamber as soon as the control element assumes its inoperative position. A workpiece arranged on the workpiece support is thus no longer subject to the prevailing in the support base vacuum and therefore can be easily separated from the workpiece support.
  • the ventilation device has a ventilation line integrated into the pivot shaft, which is in flow connection in the inoperative position of the control member with a ventilation opening and which in the operating position of the control member of the ventilation opening is disconnected.
  • the pivot shaft is used in such an embodiment, not only the support of the control member, but it also serves to provide a flow path through which the suction chamber can be vented in the inoperative position of the control member.
  • a sieve or a filter is arranged at the ventilation opening of the holding device, because this ensures that processing waste which arises during processing of the workpiece, for example sawdust, can not reach the suction space via the ventilation opening and the ventilation line.
  • the holding device is mechanically fixable by means of a manually operable fixing device in dependence on the position of the control member on the support base.
  • a manually operable fixing device in dependence on the position of the control member on the support base.
  • control member is held on a pivotally mounted pivot shaft which carries an eccentric for actuating the fixing device.
  • the fixing device can be actuated by means of the eccentric at the transition of the control member from the inoperative position to the operating position.
  • the fixing device preferably comprises two clamping levers, which are pivotably mounted on opposite sides of the suction part and which are pivotable in the direction of transition of the control member from the inoperative position to the operating position in the direction facing each other.
  • the workpiece support is movable back and forth between a lowered and a raised position in response to the position of the control member.
  • the workpiece support occupies a lowered position in the inoperative position of the control member and a raised position in the operating position of the control member.
  • the workpiece support is pivotally supported on the suction member so as to be reciprocable by pivotal movement between its raised position and its lowered position.
  • the actuator is held on a pivotally mounted pivot shaft which carries an eccentric for raising and lowering the workpiece support.
  • This provides a structurally simple way to lower the workpiece support when the actuator is pivoted, starting from its operating position to its inoperative position. Conversely, the workpiece support is raised when the actuator is pivoted back from its inoperative position to its operating position.
  • the holding device comprises a flow channel extending from the suction chamber and extending as far as an upper side of the workpiece support, so that a flow channel placed on the workpiece support Workpiece is sucked due to the applied negative pressure to the workpiece support.
  • the holding device has a pneumatic clamping device with at least one clamping jaw for fixing the workpiece to the workpiece support. Such a configuration is particularly advantageous if the workpiece to be machined in the region of the workpiece support has no smooth or sufficiently large position surface and consequently can not be sucked in easily.
  • the workpiece can be fixed to the workpiece support by the clamping jaw exerts a clamping force on the workpiece by means of the negative pressure provided by the support base, so that it can be clamped between the clamping jaw and the workpiece support.
  • the suction part defines a suction chamber, which opens into the underside of the suction part and in which a piston is slidably held, which bears tightly against the walls of the suction chamber and which is mechanically coupled to the at least one clamping jaw.
  • the piston By pressurizing the suction chamber with negative pressure, the piston can be moved in the direction of the support base, wherein the movement of the piston is transferred to the clamping jaw, which moves in the direction of the workpiece support, so that a workpiece arranged therebetween can be clamped in a structurally simple manner.
  • the operation of the holding device according to the invention is simplified in an advantageous embodiment in that the at least one clamping jaw against the action of an elastic restoring force is pneumatically lowered in the direction of the workpiece support.
  • This has the advantage that the clamping jaw automatically assumes a rest position in which they have an enlarged Distance to the workpiece support has when the piston is no longer subjected to negative pressure.
  • the flow connection between the suction chamber and the flow channel of the support base can be interrupted by the control member is moved to its inoperative position, so that the shut-off valve of the support base assumes its closed position.
  • the invention relates not only to a holding device for workpieces to be machined but also a vacuum clamping system with a holding device of the type described above.
  • the vacuum clamping system comprises, in addition to the holding device designed for example as a clamping beam support base having a clamping surface on which the holding device can be placed, and a connectable to a vacuum source flow channel, which opens into the clamping surface and the clamping surface adjacent receives a shut-off valve, wherein the shut-off valve comprises an at least partially magnetic or magnetizable valve body.
  • a generally occupied by the reference numeral 10 holding device is shown, which can be placed to define a workpiece to be machined on a support base, as shown in dashed lines in Figure 4 in the form of a clamping bar 12.
  • Holding device 10 and clamping bars 12 form in combination a vacuum clamping system 14, which is used in particular in woodworking machines.
  • the vacuum clamping system for example, window frames can be fixed to a support table of the processing machines.
  • the holding device 10 comprises a hood-shaped suction part 16, which has a top wall 17, of the integrally an end wall 18, a rear wall 19th and a first and a second side wall 20 and 21 protrude in the direction of the clamping bar 12 down.
  • the suction part 16 surrounds a suction chamber 23, which opens into a bottom 24 of the suction part 16 and is surrounded in the region of the bottom 24 by a sealing ring 25 which is arranged in an integrally formed in the bottom 24 annular groove 26.
  • an apron 28 or 29 is respectively screwed to the side walls 20 and 21, the protective plates 28, 29 projecting downwards over the underside 24 of the suction part 16.
  • the top wall 17 of the suction part 16 has a central through-bore 31, which is penetrated by an outer sleeve 33, wherein the outer sleeve 33 comprises a flange 34 which is seated on the top side 17 on the top wall and screwed thereto.
  • the outer sleeve 33 surrounds an inner sleeve 36, which is held displaceably in the outer sleeve 33 and is penetrated by a plunger 38.
  • the plunger 38 has a through hole 39 and carries at its bottom, the bottom 24 of the suction member 16 facing the end of a piston 41 which is slidably held in the suction chamber 23 and the interposition of a sealing ring 42 inside the end wall 18, the rear wall 19 and the both side walls 20 and 21 is tight.
  • the outer sleeve 33 is encompassed by an end cap 44 from which a clamping jaw 45 projects laterally.
  • the end cap 44 is bolted to the inner sleeve 36, on the upper end surface 46, the end cap 44 is seated. A displacement movement of the piston 41 is thus transmitted via the plunger 38 and the inner sleeve 36 to the end cap 44 and from there to the clamping jaw 45.
  • the through hole 39 of the plunger 38 receives a compression spring 48, which on the one hand to a displaceably held in the through hole 39, the piston 41 facing slide pin 49 and on the other hand supported on an end pin 50 which presses into the end cap 44 adjacent end portion of the through hole 39 is.
  • the suction chamber 23 of the suction member 16 is penetrated by a pivot shaft 52 which is pivotally mounted in respective through holes of the side walls 20 and 21 and projects beyond the side walls 20 and 21 to the outside. On the pivot shaft 52, the sliding pin 49 is supported.
  • the pivot shaft 52 carries a magnet holder 53, on which a plurality of series-arranged in series permanent magnets 54 are held.
  • the permanent magnets 54 form a control member for opening and closing a shut-off valve arranged on the clamping bar 12.
  • pivot shaft 52 In its over the end wall 18 outwardly projecting end portion of the pivot shaft 52 carries a pivot lever 56 which is rotatably connected to the pivot shaft 52.
  • the pivot shaft 52 and with this held on her permanent magnets 54 can be pivoted between an operating position shown in Figures 5 and 6 and a pivoted by 90 ° inoperative position back and forth.
  • the permanent magnets 54 face the underside 24, whereas in their inoperative position they face the side wall 21 and thus occupy a greater distance from the underside 24.
  • the pivot shaft 52 has a blind bore 58 which of a Plug 59 is tightly closed and in the region of the end wall 18, a transverse bore 60 opens.
  • the blind bore 58 is followed, within the suction chamber 23, by a transverse end bore 61, via which the blind bore 58 is in fluid communication with the suction chamber 23.
  • a ventilation duct 63 adjoins the pivot shaft 52 and opens into a ventilation opening 64, which is covered by a filter 65.
  • the side walls 20 and 21 each carry a pivotable, double-armed clamping lever 67 and 68. These are each held on a pivot bearing 69 and 70 and respectively include a first lever arm 71 and 72 and a second lever arm 73rd or 74.
  • the second lever arms 73, 74 are curved like a hook and facing each other in their free end regions.
  • the first lever arms 71, 72 are each penetrated by an adjusting bolt 76 and 77, respectively.
  • the adjusting bolts 76, 77 have a spherical end, which dips into an oblique bore 79 and 80, which extends within the rear wall 19, starting from the region of the pivot shaft 52 to the side walls 20 and 21 respectively.
  • the adjusting balls 84 and 85 are pressed in an intermediate position of the pivot shaft 52 by means of the inner eccentric 82 to the outside, so that the spherical end portions of the adjusting bolt 76th and 77, which are mechanically coupled to the adjusting balls 84 and 85, are pressed in the direction of the free end of the respective oblique bore 79 and 80, respectively, and thus coupled to the adjusting bolts 76 and 77, respectively, the clamping levers 67 and 68 perform a pivoting movement in the the two lever arms 73, 74 move towards each other.
  • the inner eccentric 82 is integrally connected to an outer eccentric 87 projecting outwardly beyond the rear wall 19.
  • This cooperates with a workpiece support 90, which is integrally connected to a pivot member 91 which is U-shaped and by means of screws about a perpendicular to the longitudinal axis of the pivot shaft 52 aligned pivot axis 92 is pivotable.
  • the workpiece support 90 is disposed above the two clamping levers 67, 68 and can be moved by pivoting the outer eccentric 87 about the pivot axis 92 between a lowered position and a raised position back and forth.
  • the clamping bar 12 shown in broken lines in FIG. 4 has on the upper side a clamping surface 95 onto which the holding device 10 can be placed.
  • the clamping bar 12 is formed like a profile and comprises a flow channel 96, which opens into the clamping surface 95 and to which a vacuum source, such as a vacuum pump, can be connected. Adjacent to the clamping surface 95, the flow channel 96 receives a shut-off valve 97 with a magnetizable or magnetic valve body 98.
  • the clamping bar 12 On its longitudinal sides 99, 100, the clamping bar 12 has a longitudinal groove 101 and 102, respectively.
  • the flow channel 96 of the clamping bar 12 may be permanently subjected to negative pressure, since the magnetic shut-off valve 97, if it does not interact with permanent magnets 54 of a holding device 10, automatically assumes its closed position. If a workpiece to be machined to be fixed, the holding device 10 can be placed with its bottom 24 on the clamping surface 95 of the clamping bar 12, wherein the permanent magnets 54 initially take their non-illustrated in the drawing inoperative position. In this inoperative position, the permanent magnets 54 face the side wall 21 and therefore have a considerable distance from the magnetic shut-off valve 97. This distance ensures that the shut-off valve 97 maintains its closed position.
  • the pivot shaft 52 can be pivoted by means of the pivot lever 56.
  • the permanent magnets 54 assume their operating position shown in Figures 4 and 5 after a pivoting movement of 90 °, in which they face the bottom 24 of the suction member 16 and therefore occupy a considerably smaller distance to the magnetic shut-off valve 97 as in their inoperative position. Due to the small distance of the valve body 98 is lifted by the permanent magnet 54 in its open position, so that the suction chamber 23 is subjected to negative pressure. This As a consequence, the piston 41 and with it the clamping jaw 45 lowers, so that a workpiece positioned between the bearing 90 and the clamping jaw 45 positioned workpiece is clamped.
  • the pivoting of the pivot shaft 52 has the consequence that the transition of the permanent magnets 54 from its inoperative position to its operating position, the clamping lever 67, 68 pivoted by the interaction of the inner eccentric 82 with the adjusting balls 84, 85 and the adjusting bolt 76, 77 so that the free end portions of the second lever arms 72, 74 dive into the longitudinal grooves 101 and 102 of the clamping bar 12 and thereby the holding device 10 is mechanically fixed to the clamping bar 12.
  • the permanent magnets 54 can be pivoted back into their inoperative position by means of the pivot lever 56, so that the valve body 98 of the magnetic shut-off valve 97 due to the greatly reduced magnetic interaction automatically assumes its closed position.
  • the pivoting of the pivot shaft 52 in the inoperative position of the permanent magnets 54 also has the consequence that the suction chamber 23 is vented through the vent opening 64 and that the workpiece support 90 is raised by the outer eccentric 87.
  • the clamping jaw 45 assumes a raised position due to the spring load by the compression spring 48, under the action of the plunger 38 and with this the inner sleeve 36, the end cap 44 with it held jaw 45 and the piston 41 are moved upwards.
  • the pivoting of the pivot shaft 52 in the inoperative position of the permanent magnets 54 also has the consequence that the inner eccentric 82, the adjusting balls 84, 85 releases, so that the clamping lever 67, 68 can be pivoted outwardly and consequently the second lever arms 73, 74 Release longitudinal grooves 101, 102.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
  • Feeding Of Workpieces (AREA)
  • Manipulator (AREA)
EP06002519A 2005-04-28 2006-02-08 Dispositif de retenue pour une pièce à travailler et système de serrage avec un tel dispositif de retenue Expired - Fee Related EP1716976B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005020801A DE102005020801A1 (de) 2005-04-28 2005-04-28 Haltevorrichtung für zu bearbeitende Werkstücke sowie Vakuumspannsystem mit einer derartigen Haltevorrichtung

Publications (3)

Publication Number Publication Date
EP1716976A2 true EP1716976A2 (fr) 2006-11-02
EP1716976A3 EP1716976A3 (fr) 2008-07-30
EP1716976B1 EP1716976B1 (fr) 2011-04-06

Family

ID=36678555

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06002519A Expired - Fee Related EP1716976B1 (fr) 2005-04-28 2006-02-08 Dispositif de retenue pour une pièce à travailler et système de serrage avec un tel dispositif de retenue

Country Status (4)

Country Link
EP (1) EP1716976B1 (fr)
AT (1) ATE504396T1 (fr)
DE (2) DE102005020801A1 (fr)
ES (1) ES2361093T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105345529A (zh) * 2015-11-27 2016-02-24 重庆明高机械制造有限公司 倾斜阀体定位机构
CN105345693A (zh) * 2015-11-27 2016-02-24 重庆明高机械制造有限公司 阀门装夹机构

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19746497C2 (de) 1997-10-22 2000-04-06 Schmalz J Gmbh Vakuumspannsystem
US6264185B1 (en) 2000-04-19 2001-07-24 Shoda Iron Works Co., Ltd. Suction pad

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1032441B (de) * 1954-07-09 1958-06-19 Deutsche Edelstahlwerke Ag Hafteinrichtung mit dauermagnetisch erregten Haftpolschuhen
DE19613094C2 (de) * 1996-04-01 1998-08-06 Schmalz J Gmbh Vorrichtung zum Spannen von Werkstücken
DE59812819D1 (de) * 1997-10-22 2005-06-30 Schmalz J Gmbh Vakuumspannsystem
DE19748374C1 (de) * 1997-11-03 1999-04-01 Schmalz J Gmbh Vakuumspanneinrichtung
DE29719703U1 (de) * 1997-11-06 1999-04-01 Homag Maschinenbau Ag, 72296 Schopfloch Blocksauger
DE29911761U1 (de) * 1999-07-09 2000-11-16 Schmalz J Gmbh Vakuumspanneinrichtung
DE19938851B4 (de) * 1999-08-17 2005-04-07 Gustav Weeke Maschinenbau Gmbh Vorrichtung zum Spannen von Werkstücken

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19746497C2 (de) 1997-10-22 2000-04-06 Schmalz J Gmbh Vakuumspannsystem
US6264185B1 (en) 2000-04-19 2001-07-24 Shoda Iron Works Co., Ltd. Suction pad

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105345529A (zh) * 2015-11-27 2016-02-24 重庆明高机械制造有限公司 倾斜阀体定位机构
CN105345693A (zh) * 2015-11-27 2016-02-24 重庆明高机械制造有限公司 阀门装夹机构

Also Published As

Publication number Publication date
DE502006009235D1 (de) 2011-05-19
DE102005020801A1 (de) 2006-11-02
EP1716976A3 (fr) 2008-07-30
ES2361093T3 (es) 2011-06-13
EP1716976B1 (fr) 2011-04-06
ATE504396T1 (de) 2011-04-15

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