EP3981546A1 - Pneumatic clamp for plates with tilting jaws - Google Patents

Pneumatic clamp for plates with tilting jaws Download PDF

Info

Publication number
EP3981546A1
EP3981546A1 EP20737508.0A EP20737508A EP3981546A1 EP 3981546 A1 EP3981546 A1 EP 3981546A1 EP 20737508 A EP20737508 A EP 20737508A EP 3981546 A1 EP3981546 A1 EP 3981546A1
Authority
EP
European Patent Office
Prior art keywords
arm
clamping
clamp
pneumatic clamp
compensating
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.)
Pending
Application number
EP20737508.0A
Other languages
German (de)
English (en)
French (fr)
Inventor
Miquel Sarabia Trilla
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP3981546A1 publication Critical patent/EP3981546A1/en
Pending legal-status Critical Current

Links

Images

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
    • B25B5/00—Clamps
    • B25B5/14—Clamps for work of special profile
    • B25B5/145—Clamps for work of special profile for plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
    • B21D43/11—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers for feeding sheet or strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/05—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work specially adapted for multi-stage presses
    • 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
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/061—Arrangements for positively actuating jaws with fluid drive
    • B25B5/064—Arrangements for positively actuating jaws with fluid drive with clamping means pivoting around an axis perpendicular to the pressing direction
    • 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
    • B25B5/00—Clamps
    • B25B5/16—Details, e.g. jaws, jaw attachments
    • 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
    • B25B5/00—Clamps
    • B25B5/16—Details, e.g. jaws, jaw attachments
    • B25B5/163—Jaws or jaw attachments

Definitions

  • the present invention relates to an improved pneumatic clamp for a stamping press or servo-press with transfer system, wherein the clamp is of the type which holds a sheet or work piece by means of two clamping tips separated from each other, near the edge of the workpiece, and wherein said pneumatic clamp differs from the already known ones in that it makes it possible to ensure with total reliability that the two clamping tips apply the same force to the sheet, thus making the transfer press more reliable and productive, among other advantages which will be described below.
  • Stamping presses are used in industry to shape metal parts, such as the formed sheets used in the automotive industry. These presses include an automatic plate positioning and transfer system, usually called a "transfer system", which allows the sequential die-cutting of a plate along a plurality of dies placed in the press.
  • a transfer system which allows the sequential die-cutting of a plate along a plurality of dies placed in the press.
  • transfer system includes a plurality of pneumatic clamps that are distributed along a pair of clamp-holder profiles located notably parallel to each other and on both sides of the consecutive stamping dies of the press. Both clamp-holder profiles are coupled to several bars belonging to the press transfer that are able to make a back and forth movement in the direction of the advancement of the sheets to be stamped, so that a group of clamps associated to the same die is able to hold a sheet to be stamped, transfer it to the next die, and go back to its original die, while the sheet is being stamped. This process is repeated with the subsequent sheets to be stamped or die-cut.
  • the above-mentioned pneumatic clamps for stamping presses with transfer system generally comprise clamping arms for the sheet to be stamped and a support body which is equipped with an inner cavity where a pneumatic cylinder is housed.
  • This cylinder has the function of operating a clamping arm that is connected and hinged to the support body.
  • Each of the clamps includes tubes to feed the pneumatic circuit of the cylinder and electrical cables that feed one or more sensors for the presence of the sheet to be stamped.
  • These clamping arms can be of different types, e.g. one fixed and one movable or two movable arms.
  • all clamping devices are synchronised so that they simultaneously remove a workpiece from one workstation and transfer the workpiece to the next workstation.
  • Stamping processes with presses that include transfer systems seek to increase production (i.e. parts per minute) by increasing the working speed of the system. As the working speed increases, so does the acceleration and deceleration of the transfer movement of the clamp with the clamped plate. However, it has been found that the higher the speed of the system, the greater the force that the clamp needs to exert on the sheet being stamped to prevent it from sliding or turning due to the difference in forces at each clamping point during the transfer movement to the next workstation (i.e. the next die).
  • a first problem that can occur when trying to increase the working speed of the workpiece transfer process between dies is the loss of grip on a workpiece and the workpiece falling off.
  • Another problem that can occur is the sliding (without falling off) of the sheet metal held by one or more clamps, altering the entire stamping process and possibly triggering an accident, which can be very serious, for example, when the sheet is placed out of position in the next die.
  • This type of incident of faulty positioning of the sheet metal in the next die can stop the entire stamping process, which has a very negative impact on the performance of the press as a whole (not just that of the workstation), and can also damage the workstation itself.
  • Spanish Utility Model ES1140856U from the same holder, is well-known and describes an improved clamp for stamping presses with a transfer system.
  • this clamp has the disadvantage that, in the embodiment of the movable upper arm equipped with two separate clamping tips, these clamping tips have a free end into which a profiled ball joint is inserted which protrudes slightly from the end of said tips and is configured to be able to turn slightly and to make contact with the upper surface of the sheet.
  • This free profiled end (which is able to rotate freely by about 9°) has the disadvantage that two separate clamping tips at a certain distance create a small undesirable misalignment of said tips because the vertical position where the respective lower ends of each profiled ball joint are mounted is not exactly the same, which does not allow us to guarantee that the same force is exerted on the upper surface of the sheet metal at each tip.
  • the plates sometimes have irregularities and slight inclinations that make the task of clamping the tips even more difficult.
  • the clamp described in the Spanish Utility Model ES1140856U has pneumatic and electrical connections arranged in a fixed position on the side of the support body, which sometimes makes it difficult for the installer to position the pipes or cables in said connections during the connection operation because a specific position must be found and sometimes the pneumatic connections and/or electrical supply cables of the sheet metal presence sensor may be installed bent or in very forced positions, and may be choked, causing an undesired limitation of the air flow.
  • the clamp described in Spanish Utility Model ES1140856U has a fixed lower arm 3b on which the lower surface of the sheet is supported and which has a short length, which does not allow optimum support of the lower surface of the sheet, especially in cases where the sheet is clamped in cantilever (i.e. only on one side).
  • the purpose of the present invention is to provide an improved pneumatic clamp for a stamping press or servo-press with a transfer system, wherein the clamp holds a sheet or workpiece by two clamping tips, ensuring that the two clamping tips apply the same force to the sheet, among other advantages to be described later.
  • this clamp from the invention is intended to clamp to sheets or workpieces arranged in a cantilevered form, i.e. one or more clamps are clamped to a sheet or workpiece, but only on one side.
  • the clamp from the invention may also be used satisfactorily to clamp a sheet metal or workpiece on both sides, that is, providing at least one clamp on each side of the sheet metal, so as to give greater clamping stability.
  • the present invention provides a pneumatic clamp comprising a first arm and a second arm between which the sheet or piece to be stamped is held and also comprises a support body which is equipped, at least, with an inner cavity where a fluid-dynamic cylinder for the operation of the first arm is housed, said cylinder being capable of operating the first clamping arm which is connected and hinged to said support body.
  • the first articulated clamping arm from the clamp on the invention comprises at least the following elements:
  • the clamping tips comprise a respective ball joint equipped with a profiled outer surface that protrudes slightly below its lower ends. This substantially improves the grip of the tips on the upper surface of the workpiece.
  • the two clamping tips are able to rest perfectly on the uneven upper surface of each different work sheet by exerting the same force on each point. This results in a higher quality clamp that is able to hold the workpiece to be stamped much more securely, which means that the transfer system can be moved much more quickly and thus the productivity of the press can be increased.
  • the clamp from the present invention in addition to providing a greater clamping capacity, which is its main purpose, provides other advantages which are described below.
  • the clamp from the invention may be of the type in which the first arm is a movable arm which is connected and hinged to the support body and the second arm is a fixed clamping arm which is integrated into the support body extending forward.
  • the clamp from the present invention may also be of the type in which both the first arm and the second arm respectively are movable arms which are connected and hinged to said support body.
  • one or both of the movable arms could have the system with a tilting arm which is the purpose of the present invention.
  • the first clamping arm is preferably of the type that at the end opposite the tilting arm of the first clamping arm includes a groove that serves as a guide for an actuator bearing, which is solidly connected to the piston rod of the actuating cylinder of the first arm.
  • an actuating sleeve e.g. treated steel sleeve
  • the bearing has the advantage over the sleeve in that the clamping force of the clamp is substantially increased (about 290%).
  • the first clamping arm comprises the following elements:
  • the inner axis is preferably attached by means of a nut with a rear extension which is located inside the front end of the axis and when mounted it is flush with the front face of the compensating arm.
  • the profiled ball joint inserted in each lower end of the clamping tips is configured with such dimensions to enable it to be turned by a maximum of 9°.
  • the compensating arm preferably has a distance between the two holes for the tips between 19 and 70 mm, for example 20 mm or 50 mm. The greater this distance between the tips, the more stable the clamping of the sheet will be.
  • the second clamping arm comprises an extended surface that extends forward beyond the vertical plane where the workpiece clamping tips are arranged.
  • This extended surface allows the sheet to be conveniently supported on said extended surface, thus substantially improving the clamping of the sheet.
  • the extended surface is extended forward by between 12 and 60 mm.
  • the second clamping arm comprises, on said extended surface, a grooved surface in at least each area where the tips are supported, and wherein this/these grated surface(s) comprise(s) grooves or channels which extend in a transversal direction to the longitudinal Y-Y' axis of the support body (i.e. they extend in the direction of the transfer feed).
  • a grooved surface in the area where a tip rests occupies an area at least equal to the surface of the bottom of the tip.
  • either a grooved surface can be provided in each area where the tips are supported, or a single grooved surface for both tips that extends transversely.
  • this grooved surface has regular grooves of equal depth extending downwards and having a preferably trapezoidal or triangular section.
  • Test number 2 Clamp with a first arm with a tilting arm according to the invention but with the non-grooved surface of the second arm 85 Newtons 13.3%
  • Test number 3 First arm with a tilting arm according to the invention and with the grooved surface of the second arm 181 Newtons 241.3%
  • the clamp from the invention may comprise, unlike conventional clamps, a rotating ring which is externally fixed in a particular position on the support body, but with the possibility of rotating (preferably completely) around the support body, wherein the rotating ring comprises fluid inlet and outlet ports, and wherein the ring is configured to be externally attachable to an external part of the support body.
  • the rotating ring also includes a channel for passing the electrical connections of the sheet metal presence sensor. This ring makes it easier to insert the fluid inlet and outlet ports and the electrical wiring, i.e. to gain in positioning versatility of the fluid inlet and outlet ports and the electrical connections, by being able to rotate the ring 360° around the support body, as appropriate in each case.
  • the improved clamp from the invention preferably presents a rear portion of the support body which has a grooved surface that facilitates the coupling of the rotating ring in such a way that it cannot be removed but can rotate.
  • This grooved surface has a plurality of grooves at different points along the length of the support body. The purpose of these grooves is to insert the respective O-rings to channel the air ducts and also to help hold the ring in the specific working position, and with the possibility of rotation.
  • the support body portion may comprise a non-return flap that prevents removal of the ring by the user.
  • the two fluid inlet and outlet ports can also be arranged in a fixed manner, leaving the rear face of the support body, preferably inserted in the shock absorber element that acts as a stop for the cylinder piston.
  • This second embodiment without a ring is cheaper than the preceding embodiment with a ring because it has one less piece (the ring) although, on the other hand, it may involve a slightly longer clamp length and more ports than the solution with a ring.
  • the fluid inlet and outlet ports are located at the rear of the clamp, and when there is little space to accommodate them at the rear, said ports are located at the side.
  • the improved clamp from the invention features a back end configured to be attached by any known mechanical means to a clamp-holding piece.
  • the support body of the improved clamp from the invention presents at least one external part in a substantially cylindrical form.
  • the cost of manufacturing the support body is significantly reduced, as it is much easier to machine than a prismatic piece, while requiring less material, so that the total cost of manufacturing the support body decreases.
  • both the back of the support body and the front have a substantially cylindrical outer part.
  • the first clamping arm is connected and hinged to the clamp's support body at a hinge point that is substantially aligned with the second clamping arm. This allows for the use of shorter clamping tips, which contributes to reducing the overall weight of the arm.
  • the improved clamp from the invention comprises a collet groove which serves as a guide for an actuator bearing which is attached solidly to the piston rod of the actuating cylinder of said articulated arm.
  • the holder of the present invention has observed that this actuator bearing contributes to extending the life of the clamp.
  • the rear chamber of the cylinder for the fluid inlet and outlet may include a damping element that acts as a stop for the cylinder piston.
  • Said damping element is designed to absorb kinetic energy from the movement of the first articulated clamping arm and contributes to the speed of the upper arm. The provision of this dampening element allows, advantageously, a very significant reduction in the noise made by the clamp while working, thus improving the environmental conditions of the workplace.
  • the clamp can comprise a presence sensor for the piece to be stamped that includes a power cable from said sensor integrated into the portion of the support body that defines the second arm. This feature helps to reduce the overall height of the clamp, which releases more space.
  • Said fluid dynamic cylinder is a pneumatic fluid cylinder with a diameter of more than 20 mm, for example, a diameter of 25 mm or 32 mm, which contributes to a clamp with a higher clamping force.
  • the clamp should preferably have two inlet and outlet ports for the feed fluid of the fluid-dynamic cylinder (e.g. pneumatic), which are preferably arranged on the ring.
  • the fluid-dynamic cylinder e.g. pneumatic
  • Figures 1 to 8 are drawings representing a first embodiment of the two-pronged clamp object of the present invention. Specifically:
  • Figures 9 to 15 are drawings representing a second embodiment of the two-pronged clamp object of the present invention. Specifically:
  • FIGS 16 to 19 are drawings representing the first clamping arm of the first embodiment of the two-pronged clamp object of the present invention, wherein:
  • Figure 20 shows the same figure on the front elevation of the clamp from the second embodiment, wherein the small set of the turning angle ⁇ 1 between the tilting arm and the arm element has been represented.
  • Figure 21 shows a perspective view of a third embodiment of the two-pronged clamp object of the present invention, in a closed position, similar to the second embodiment, but in this case wherein the grooved surface of the second fixed arm occupies the entire extended surface.
  • 3 different details have been represented: detail 1 which refers to the grooved surface, detail 2 which refers to the lower end of the tip with which a sphere is equipped (in industry parlance called a ball joint) which is profiled to provide a friction with the surface of the sheet (not shown), and finally detail 3 which refers to the zigzag profile of the grooved surface.
  • Detail 2 shows how the tip is formed by a screw 21 equipped with a lower hole wherein the profiled ball joint 22 is inserted.
  • Figures 22a, 22b and 22c show the arrangement of the clamp from the first embodiment once it is installed in a clamp holder and the same runs along a profile.
  • Figures 23 to 28 are drawings representing a fourth embodiment of the two-pronged clamp object of the present invention, similar to the first embodiment, but in this case there is no ring and the air intakes are arranged on the rear face of the clamp and the second fixed arm has no extended surface, wherein:
  • the pneumatic clamp 1, 100, 200, 300 includes two arms 3a, 3b for the clamping of a piece to be stamped (not shown in any of the enclosed figures) and a body 4a, 4b for the support which is equipped with an inner cavity 27 where a fluid-dynamic cylinder 26 is housed (see Figures 7, 8 , 14 and 15 ).
  • This fluid-dynamic cylinder 26 drives the first upper clamping arm 3a, which is movable and is connected and hinged to axis 25 of the support body 4a, 4b.
  • This action of the fluid-dynamic cylinder 26 is carried out by means of an actuator bearing 31 associated with piston rod 28 of cylinder 26.
  • the rear chamber 27 of the pneumatic cylinder 26 comprises a damping element 29 which acts as a stop for the piston 30 of the cylinder.
  • This damping element 29 absorbs the kinetic energy from the movement of the first clamping arm 3a, thus reducing the noise produced by the pneumatic clamp 1, 100, 200, 300 during operation.
  • the pneumatic clamp 1 described in the first embodiment has a support body 4a, 4b made of treated steel and a pneumatic cylinder diameter of 25 or 32 mm.
  • the second clamping arm 3b which corresponds to the lower arm and is fixed, is also integrated into the support body 4 of the pneumatic clamp 1, 100, 200, extending from a front portion 4a of the support body 4 itself, as shown in the attached figures.
  • the first movable arm 3a has in all cases two clamping tips 2a, 2b for the sheet to be stamped.
  • the two clamping tips 2a, 2b are quite close to each other, about 20 mm, while in the second embodiment 100 and in the third 200 of the clamp are further apart, about 60 mm.
  • the pneumatic clamp 1, 100, 200 of the present invention is characterised by the fact that the first movable articulated clamping arm 3a is formed by an arm element 19 and attached transversely with a slight clearance at its front end, a compensating arm 10, where said compensating arm 10 comprises two through holes 13 separated from each other by a certain distance, one at each end of the compensating arm 10 to receive inside it each clamping tip 2, and a respective set of nut 12a, 12b and screw to attach each clamping tip 2 at the upper interior of each hole 13, and wherein said compensating arm 10 and element arm 19 are configured with a tilting means so that the compensating arm 10 can tilt slightly with respect to the longitudinal axis of the arm element 19.
  • the first movable articulated clamping arm 3a which consists of an arm element 19 and attached transversely by means of a slight play at its front end a compensating arm 10, is clearly shown in Figure 16 .
  • the element arm 19 has a front end with two flat side surfaces 33, and in addition the arm element 19 has a longitudinal hole 18 that starts at its front surface with such a dimension and length such as to accommodate an inner axis 13 (shown, for example, in Figures 7 , 15 or 17 ).
  • Figures 7 and 15 show that the longitudinal hole 18 is slightly longer than the length of the inner axis 13, once it is correctly mounted inside it and attached by means of a nut 20.
  • the compensating arm 10 shown separately in Figures 17 , 18 and 19 , has an elongated body of a certain thickness with a central hole 22 on its rear surface (see Figures 18 and 19 ) which extends in a transverse direction to the compensating arm 10 so as to accommodate part of the axis 13 and which is also equipped with a recess 23 on this rear surface which defines a recess with at least two flat side walls 33 and where the distance between these flat walls is slightly greater than the distance between the two flat side surfaces of the arm element 19, so that the arm element 19 is fitted perfectly into this recess 23 but has a slight tilting clearance of 0 to 10° of the compensating arm 10 in relation to the longitudinal axis of the first arm.
  • Figure 20 schematically shows this clearance of the compensating arm 10 between 0 and 10° above or below the longitudinal axis of the arm element. This means that there would be 5° up and 5° down with respect to the longitudinal axis X-X' of arm element 19.
  • the inner axis 13 is arranged inside both holes 22, 18 of the compensating arm 10 and arm element 19, and wherein through inner axis 13, the compensating arm 10 and the arm element 19 are connected and at the same time the axis allows the slight tilting of one of the two pieces 10, 19 around said inner axis 13.
  • FIG. 1 Another feature of the pneumatic clamp 1, 100, 200 of the present invention lies in the particular configuration of the outer surface of the support body 4a, 4b which, as can be seen in Figures 1 to 15 , is noticeably cylindrical. It has a cylindrical rear portion 4a, which extends frontally to form another front portion 4b, also significantly cylindrical.
  • pneumatic clamp 1, 100, 200 from the present invention is in the provision of an extended surface 15 of the second clamping arm 3b, wherein said extended surface 15 comprises part or all of its upper surface in the form of grooves 14.
  • these two grated surfaces 14 are formed by a plurality of homogeneous grooves that extend in a transverse direction to the longitudinal axis of the support body 4a, 4b.
  • these two grated surfaces 14 cover the entire area of extended section 15, while in the case of Figures 1 to 15 , they occupy only part (i.e. not all) of said extended sections 15.
  • these two grated surfaces 14 have regular grooves of equal depth and the same section (in this case a zigzag section with a triangular profile).
  • detail 3 which depicts a groove, it can be seen that its depth is about 0.5 mm, the distance between the tips of the ridges is 1 mm and the angle between two adjacent ridge planes is 90°.
  • This specific configuration of the plurality of grooves has been shown by the holder to be very advantageous, in order to provide optimum friction with the inner surface of the sheet, which rests on the lines of the different ridges that make up this grooved surface.
  • FIG. 21 detail 2 can be seen which shows the configuration of the lower part of the screw 21, which configures the tip 2b or 2a and whose lower end has a profiled ball joint 22 inserted inside this lower end.
  • This profiled ball joint 22 has the capacity to rotate about 9° with respect to the body of the screw 21.
  • Figures 22a, 22b and 22c show the clamp of the first embodiment once it is installed in a possible clamp holder and it runs along some profiles (here only one of the two profiles 32 is shown).
  • the ring 11 can be rotated manually by the user by acquiring the various angular positions desired, for example by pointing to the left side in Figure 22a , upwards in the following Figure 22b or to the right side in the last Figure 22c .
  • clamp 1 with piston diameter provides a clamping force of up to 180 decaNewtons (daN) for a working pressure of 6 bar.
  • the fluid inlet and outlet ports 15 are arranged on the rear face of the clamp, see Figure 27 .
  • the second fixed arm 3b does not have any extended surface, but, as shown in Figure 25 , it is vertically aligned with the points 2, 2b.
  • Figures 23 to 28 show how the end of the second fixed arm 3b comprises two grated surfaces 14 located at the two ends.
  • Figure 28 shows a longitudinal section of the clamp 300 of the fourth embodiment, in a closed position. This view shows how the fluid inlet and outlet ports 15 are embedded in the rear part of the clamp 300, and more specifically in the rear damping element 29. It can also be seen that the piece 30 is the same as the clamp 1 from the first embodiment. The only structural change to the internal components of the cylinder 26 is an intermediate piece which has a different and simpler configuration than that of the clamp 1 from the first embodiment as there is no ring.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manipulator (AREA)
  • Jigs For Machine Tools (AREA)
EP20737508.0A 2019-06-04 2020-06-03 Pneumatic clamp for plates with tilting jaws Pending EP3981546A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201930502A ES2798024B2 (es) 2019-06-04 2019-06-04 Pinza neumatica mejorada para prensa de estampacion con sistema transfer
PCT/ES2020/070373 WO2020245487A1 (es) 2019-06-04 2020-06-03 Pinza neumática con mordazas basculantes para chapas

Publications (1)

Publication Number Publication Date
EP3981546A1 true EP3981546A1 (en) 2022-04-13

Family

ID=71527819

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20737508.0A Pending EP3981546A1 (en) 2019-06-04 2020-06-03 Pneumatic clamp for plates with tilting jaws

Country Status (3)

Country Link
EP (1) EP3981546A1 (es)
ES (1) ES2798024B2 (es)
WO (1) WO2020245487A1 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4289524A1 (de) * 2022-06-09 2023-12-13 Schaeffler Technologies AG & Co. KG Greifeinrichtung zum greifen bei der herstellung einer bipolarplatte

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020133999B4 (de) * 2020-12-17 2023-09-28 TRUMPF Werkzeugmaschinen SE + Co. KG Nachsetzeinrichtung und Verfahren zum Nachsetzen für ein plattenförmiges Werkstück in einer Bearbeitungsmaschine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE729654C (de) * 1940-12-21 1942-12-19 Wilhelm Thienes Schraubstock
DE4222741A1 (de) * 1991-09-30 1993-04-01 Horst Warneke Fertigungsstrasse zur herstellung einer stahlkassette fuer decken- und/oder wandkonstruktionen aus einer blechtafel
DE69738843D1 (de) * 1996-10-07 2008-08-28 Phd Inc Greifer
US6641189B2 (en) * 2001-03-16 2003-11-04 Phd, Inc. Article sensor assembly
DE202010010687U1 (de) * 2010-07-27 2010-09-30 Krahn, Heinrich Universal-Ausgleichspannelement
ES1140856Y (es) * 2015-06-08 2015-09-30 Trilla Miquel Sarabia Pinza mejorada para prensa de estampacion con sistema transfer
CN208542861U (zh) * 2018-06-05 2019-02-26 广州市恒宇印铁制罐有限公司 一种薄板上料装置
CN109676049B (zh) * 2019-01-04 2024-01-09 济南凯丰数控机械有限公司 四边折边机夹紧旋转送进装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4289524A1 (de) * 2022-06-09 2023-12-13 Schaeffler Technologies AG & Co. KG Greifeinrichtung zum greifen bei der herstellung einer bipolarplatte

Also Published As

Publication number Publication date
WO2020245487A1 (es) 2020-12-10
ES2798024B2 (es) 2021-05-13
ES2798024A1 (es) 2020-12-04

Similar Documents

Publication Publication Date Title
EP3981546A1 (en) Pneumatic clamp for plates with tilting jaws
US20190152006A1 (en) Fixture block composite structure for workpiece positioning
CA2640866C (en) Clamping fixture
US9321109B2 (en) Power operated chuck
JP2006102887A (ja) ワーククランプ装置
KR20170091205A (ko) 원 웨지 센터링 유압척
US4928938A (en) Clamping device
CN212095404U (zh) 夹具
EP1616660A1 (en) Clamping device
CN211029038U (zh) 工件夹杆机构
JP4063923B2 (ja) ワークバイスの中間爪ブロック
US8075001B2 (en) Chuck and rotary orienting device
CN209753739U (zh) 一种小型折弯机
CN210549564U (zh) 一种多工位轴类精密加工夹具
CN108515327B (zh) 汽车座椅滑轨自动装配柔性夹具
CN210121770U (zh) 一种铣床的夹具
CN212683267U (zh) 加工机的零点定位机构
CN219189159U (zh) 用于焊接机的夹持机构
CN212170235U (zh) 一种气动执行器拧螺丝用的高效率工装
CN216802493U (zh) 装夹治具及装夹上料结构
CN215280967U (zh) 机床夹紧装置
CN213646770U (zh) 一种车床车薄板用的夹具及车床
CN110695416B (zh) 一种随行装置
CN214134942U (zh) 镂空工件装夹装置
CN218746193U (zh) 一种翻转装置

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20211124

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20230113

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230518

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20240116

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3