Classifications

• • 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
• • 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
  • B21D43/055—Devices comprising a pair of longitudinally and laterally movable parallel transfer bars

Definitions

• the invention relates to a transfer device according to the preamble of claim 1.
• Transfer devices are used to usually transport several workpieces step by step simultaneously through a processing machine, so that different processing operations can be carried out on the workpieces one after the other at individual processing stations.
• Such transfer devices are frequently used in connection with step presses.
• step press forming is carried out simultaneously on a plurality of workpieces located in the press.
• a respective workpiece is located at a specific station of the step press and undergoes a specific shaping there. After further transport to the next station, the step-by-step formation continues until the final product.
• the transfer device ensures that the individual workpieces are first gripped, raised and then transported together in the machining direction. The workpieces are then lowered to the next machining position in each case, and the transfer device, in particular its so-called gripper rails, are opened in order to disengage them from the tools. While If the machining is carried out on the workpieces, the gripper rails are moved back in the open position against the machining direction in order to be able to close again to initiate the next relocating process and to lift the workpieces.
• a transfer device thus realizes three movements to be ensured independently of one another, namely lifting / lowering, opening / closing and advancing / moving back.
• a so-called two-axis transfer can be formed by realizing only a closing and feed movement or only a lifting and feed movement.
• a transfer device is known from US Pat. No. 5,680,787 in which an arm is articulated to the feed drive.
• the arm is essentially pivotable about an axis parallel to the feed direction.
• the type is engaged with a carriage such that the
• Carriage can be moved in the feed direction.
• the arm is movable with respect to the carriage, so that the carriage to which the gripper rails are attached can be raised, lowered, opened and closed without these movements being carried out by the arm of the
• Feed drive are hindered.
• a disadvantage of this known construction is that the arm of the feed drive acts on a slide on which the gripper rail is attached by means of a plurality of components connected in between.
• this construction is comparatively complex and, moreover, requires a comparatively strong feed drive, since in addition to the mass of the gripper rail, the mass of the slide has to be moved.
• the invention has for its object to provide an improved transfer device.
• the transfer device has at least one gripper rail ' .
• Two gripper rails are preferably provided.
• the gripper rail can be brought into direct or indirect engagement with at least one workpiece in order to implement the movements of the workpiece described above.
• the workpiece described above.
• Gripper rail have suitable fingers or shovels, quivers or other protruding elements in order to grip and move the workpieces. In the case of two gripper rails, these are arranged parallel to one another and grip the workpieces from both sides. To implement the movements described, the gripper rail can be driven in a lifting and / or a closing and a feed direction, and in each case in the opposite direction. Accordingly, the transfer device has at least one lifting and / or at least one closing and at least one feed drive. It should be emphasized that the measures according to the invention unfold their advantages in a transfer device which has either a lifting or a closing drive. However, both of these drives are preferably present.
• An arm is connected to the feed drive and can be pivoted about an axis largely parallel to the feed direction. Through this arm, the feed movement is transmitted from the feed drive to the gripper rail.
• this arm is directly engaged with the gripper rail in the feed direction.
• the arm does not drive any elements or slides in between, but acts directly on the gripper rail itself.
• the arm pulls or pushes the gripper rail directly in the feed direction and thus ensures the necessary feed and return movement.
• the gripper rail can be displaced in a direction perpendicular to the direction of advance with respect to the arm.
• the additional degree of freedom required is achieved by the pivotable connection of the arm to an element of the feed drive.
• the arrangement relationship can, for example, be such that when the gripper rail is raised or lowered, the gripper rail is displaced with respect to the arm.
• the opening and closing movement in the lateral direction is permitted at the connection between the arm and the gripper rail on the one hand by the arm being articulated.
• the pivoting of the arm changes the height of the point at which the gripper rail is connected to the arm. Due to the sliding connection between the gripper rail and the arm, this fits Positional relationship, however, without an unintended change in the height of the gripper rail taking place.
• the transfer device according to the invention thus realizes the required movements with a simple construction without interfering with, impeding or otherwise influencing other movements.
• only the arm and the gripper rail have to be moved by the feed drive.
• these have a comparatively small mass, so that a comparatively weak and therefore inexpensive feed drive can be used in an advantageous manner.
• the starting and braking properties of the transfer can be improved by reducing the mass to be driven on the feed.
• the fact that no slide connected to the gripper rail and its mass need to be moved in the transfer device according to the invention also offers the advantage that the slide does not have to be moved even during the opening, closing and lifting movement.
• each gripper rail is individually connected to an associated feed drive via the pivotable or foldable arm.
• advantageously no components are required which extend across the exit of the press, so that there is no hindrance to further workpiece transport.
• Feed drives can be controlled independently of each other. The fact that the elements to be moved are not mechanically connected to one another results in better control behavior.
• a rotary / slide unit is preferred for the connection of the gripper rail to the foldable arm which is in engagement in the feed direction but can be displaced perpendicularly thereto.
• Such a unit can be implemented with simple means in order to ensure the required interventions and degrees of freedom. At the same time, such a unit does not have an unnecessarily large mass.
• a structure is preferred in that it has a guide and a slide piece guided thereon.
• the guide is advantageously connected to the foldable arm.
• the slider guided on it is rotatably connected to the gripper rail.
• the foldable arm preferably has an overload protection.
• This can be designed, for example, in the form of a specific component that has a defined breaking force / release force.
• Such overload protection prevents the feed drive from permanently "trying" to move the gripper rail in the feed direction, although this movement is hindered in some way.
• the breaking force / release force can be set, for example, to 1.5 times the force usually required for moving the gripper rail and the workpieces engaged thereon, or another suitable value.
• the overload protection triggers reliably at a comparatively low force without a dangerous situation, e.g. Collision, or an overload of the feed drive can occur.
• the overload protection it is in the region of the pivotable attachment of the arm to an element of the feed drive or to a connecting element in the Surrounding the arm is provided.
• the overload protection or the overload protection can be provided between the slide (26) of the feed drive and the arm explained below, and alternatively between the arm and the gripper rail.
• a component can be used here in which a bolt disengages when a certain force is exceeded, so that the power transmission ends. This can be combined with a limit switch, which ensures that the feed drive stops when the overload protection is triggered.
• the transfer device has two gripper rails, each of which is assigned a feed drive.
• the two feed drives can be controlled independently of each other.
• the elements to be moved thereby, in particular the gripper rails are not mechanically connected to one another, which leads to improved control behavior.
• FIG. 1 is a perspective view of the transfer device according to the invention.
• Fig. 2 is a perspective view of part of the transfer device according to the invention. Detailed description of a preferred embodiment of the invention
• the transfer device 10 is shown in a perspective view in FIG. 1.
• This has two gripper rails 12 arranged parallel to one another, by means of which workpieces to be machined can be gripped, raised, advanced in the feed direction A and lowered and positioned at a subsequent machining station.
• the gripper rails are then opened in a lateral direction and the gripper rails 12 are moved back against the feed direction A.
• the area in which the workpieces are processed, for example in a step press, and in which the workpieces must be moved is shown in FIG. 1 only indicated schematically by reference number 14.
• the lifting, lowering, opening and closing movements are generated by a respective lifting and closing drive, which, as is not of importance in connection with the present invention, are divided into two So-called.
• Locking boxes 16 are located, which are arranged on the front or rear of the transfer device 10. These drives enable the two gripper rails 12 to be lifted independently of one another and to be moved in a lateral, in particular horizontal, direction.
• the control of the lifting and closing drives is coordinated in such a way that there is no unintentional lifting and lowering when opening and closing and vice versa.
• the Gripper rail each slidably mounted in the feed direction on a plunger 36 which is moved in the lifting and closing direction by the lifting and closing drive.
• the respective gripper rail 12 is fed by a respective feed drive 18. In the embodiment shown, this is in each case arranged above the gripper rail and a little laterally offset to the outside. In addition, the position of the feed drive in relation to the gripper rails depends on the position or
• Fig. 2 shows a in a perspective view
• the feed drive 18 is designed in the form of a belt drive which drives two belts 20.
• a slide 26 is attached by suitable clamps 24, on which an arm 28 is pivotally mounted.
• the arm 28 is in particular largely pivotable about an axis parallel to the feed direction A.
• the arm 28 is largely triangular in plan view, but it can have any other shape.
• the gripper rail 12 is engaged on the arm 28 in such a way that movements in the feed direction A and opposite thereto can be transmitted to the gripper rail 12.
• the arm 28 has a guide 30.
• a slide 32 engages with the guide in such a way that it can be displaced in the direction of extension (in the position shown in FIG. 2 identical to the lifting direction B) of the arm 28.
• movements in the direction of the feed direction A can be transmitted from the arm to the slide.
• the connection between the slider 32 and the gripper rail 12 is also such that forces can be transmitted in the direction mentioned.
• the gripper rail is rotatably connected to the slider 32 about an axis parallel to the direction A.
• the novel connection of the gripper rail 12 to the arm 28 does not hinder or otherwise influence the other movements of the gripper rail 12.
• the necessary feed and return movement can be transferred to the gripper rail 12 in a simple manner without having to move large masses.
• FIG. 1 a position of the arm 28 is shown in FIG. 1, which is pivoted relative to the position shown in FIG. 2, for example as a result of a closing movement of the gripper rail 12. 1 also shows that the connection between the other gripper rail and the feed drive assigned to it is mirror-inverted to the arrangement shown in FIG. 2.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manipulator (AREA)
• Specific Conveyance Elements (AREA)
• Intermediate Stations On Conveyors (AREA)
• Vending Machines For Individual Products (AREA)
• Adjustment And Processing Of Grains (AREA)
• Control Of Conveyors (AREA)
• Seal Device For Vehicle (AREA)
• Massaging Devices (AREA)
• Noodles (AREA)

Applications Claiming Priority (1)

Publications (2)

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ID=29724370

Family Applications (1)

Country Status (8)

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• 2002
  • 2002-06-17 DE DE50207144T patent/DE50207144D1/de not_active Expired - Lifetime
  • 2002-06-17 ES ES02735420T patent/ES2266505T3/es not_active Expired - Lifetime
  • 2002-06-17 WO PCT/EP2002/006651 patent/WO2003106069A1/fr not_active Ceased
  • 2002-06-17 US US10/517,708 patent/US7290430B2/en not_active Expired - Fee Related
  • 2002-06-17 EP EP02735420A patent/EP1513631B1/fr not_active Expired - Lifetime
  • 2002-06-17 AT AT02735420T patent/ATE328683T1/de not_active IP Right Cessation
  • 2002-06-17 AU AU2002310767A patent/AU2002310767A1/en not_active Abandoned
  • 2002-06-17 CA CA002489574A patent/CA2489574A1/fr not_active Abandoned

Non-Patent Citations (1)

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