Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21F—WORKING OR PROCESSING OF METAL WIRE
  • B21F23/00—Feeding wire in wire-working machines or apparatus
  • B21F23/005—Feeding discrete lengths of wire or rod
• • 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
  • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
  • B21D11/22—Auxiliary equipment, e.g. positioning devices
• • 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
  • B21D7/00—Bending rods, profiles, or tubes
  • B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment

Definitions

• the present invention relates to a holder device intended to secure a wire blank or the like in a wire bending unit.
• wire is often bent into construction components or finished products.
• the wire should here be secured as close to the bending point as possible.
• Hitherto known holders do not however meet exacting requirements for rapid switching between a release position and a securement position, and for stable securement with large securing force in all directions.
• Corresponding requirements can also be placed on holders intended to secure wire blanks and other elongate objects in contexts other than bending.
• the object of the present invention is to provide a rapidly switchable holder device which lends stability in all directions.
• Fig. 1 is a perspective view of a holder device according to the invention
• Fig. 2 is a side view of a holder device according to the invention in a fully releasing position
• Fig. 3 is a partly broken side view of the holder device in a securement position
• Fig. 4 shows schematically a bending machine provided with the holder device according to the invention. MODE(S) FOR CARRYING OUT THE INVENTION
• the holder device 1 shown in Figs. 1, 2 and 3 is intended to secure an object 2, such as a wire or a wire blank, in a bending machine during the actual bending process.
• the holder device 1 is in the bending machine mounted on a laterally movable slide, which makes the holder device able to be moved in a lateral direction to the various bending positions on the wire.
• the wire is secured by a centrally placed centre holder, which can also rotate the wire about its longitudinal axis if required.
• the longitudinal direction of the wire is oriented in the x-direction, in which the centre axis 3 of the wire also runs.
• the holder device 1 is mounted together with a bending tool, which also comprises a bending die and a bending counter-die, so that a bending unit is formed.
• a bending tool which also comprises a bending die and a bending counter-die, so that a bending unit is formed.
• the bending die comprises no bending elements for bending the wire.
• the holder device 1 comprises a base part 5, which is fixedly mounted on the frame 4 of the holder device, and a holder part 6, which is movable between a securement position, in which the wire 2 is secured, and a plurality of release positions, in which the wire in a freed position is released yet held in place and in which the wire, in another freed position, can be introduced into and removed from the holder device.
• the holder part 6 is constituted by a front part of a drive arm 10.
• the holder part 6 interacts with a seat 7 fixedly mounted on the base part 5, which seat has a forward-directed part-circular recess 8, which is intended as a support surface for the wire 2.
• the front part of the holder part is configured with a hook-shaped projection, so that a semi-circular recess 9, facing the seat 7, is formed.
• the holder part 6 is intended to execute a main movement in the direction of the seat 7, i.e. in the y-direction, in order to gain the securement position. With a movement in the opposite direction away from the seat 7, the holder part gains the release position. During this movement, the holder part will also execute a slight movement in the z-direction, so that the front, bottom edge 24 of the holder part ends up vertically above the wire when the holder part is in an outer release position. In the securement position, the recess 8 of the seat and the recess 9 of the holder part are positioned in the same plane.
• the recess 9 of the holder part is broadly semi-circular, with a radius somewhat larger than the wire material, and the recess 8 of the seat constitutes a lesser part of a semi- circle, also with a radius somewhat larger than the wire material. This means that the wire will be clamped between the surfaces of the recesses when the holder part is in the securement position.
• the movement of the holder part is produced by a substantially to-and-fro motion of the drive arm 10, i.e. along the y-axis. This movement is obtained by a drive mechanism 11, consisting of a drive motor 12.
• the drive motor is of the rotary type, for example an electric motor, a pneumatic motor or a hydraulic motor having a toothed gearing 13 and an eccentric mechanism in the form of an eccentrically fitted drive pin 14 on a wheel 15.
• the drive arm 10 is contrived to transmit large forces, yet with a certain flexibility to compensate for tolerances and, as can best be seen from Fig. 1, is powerfully constructed in, for example, solid square steel of a somewhat resilient material type, such as spring steel.
• the drive arm is configured with a substantially straight horizontal portion 16, which is arranged substantially in the y-direction, an arc- shaped portion 17, and a shorter vertical portion 18, which is arranged in the z-direction.
• the drive shaft is terminated in a hub portion 19, which has a central hole forming the bearing point for the drive pin 14.
• the rotary movement of the drive motor will hereby be translated into a substantially to-and-fro motion of the drive arm 10, wherein the holder part and its recess 9 move between the securement position and the release positions for the wire 2.
• the holder part and its recess 9 can adopt four specific positions, firstly a securement position, secondly an inner release position, in which the wire can be rotated and displaced relative to the holder part, yet still held in place, thirdly an outer release position, in which the wire can be introduced into and removed from the holder device in a direction transverse to the longitudinal direction of the wire, and fourthly an outer end position, in which the drive arm 10 can easily be exchanged for a drive arm having a holder part which has a recess 9 adapted for another wire dimension. It is also possible to fasten the holder part to the drive arm with a fastening element such that only the holder part needs to be changed when the wire dimension is changed.
• the drive arm 10 is thus suspended at its rear or inner end from the drive pin 14 and supported at its front or outer end, i.e. at the holder part, by at least one upwardly directed fixed slide face 20 of the base part 5, the holder part having a movable slide face 21 directed downwards, towards the fixed bearing surface.
• the slide face 21 is configured to give the recess 9 of the holder part its very short switching movement between the securement position and the inner release position, in which the switching movement is respectively directed substantially outwards and inwards, i.e. in the y-direction.
• the movement into the outer release position also involves a lifting movement of the holder part in the z-direction, so that the recess 8 of the seat 7 becomes freely accessible directly from the front to facilitate introduction of a new wire and removal of a ready-bent wire.
• This is achieved by configuring the holder part with an angled portion 22, which interacts with a corresponding fixed surface 23 on the base part or against at least one edge on the fixed slide face 20.
• the bottom edge 24 of the holder part should in the front release position be raised to a level which lies above the top edge of the recess 8 on the seat 7.
• the vertical distance between the bottom edge 24 of the holder part and the top edge of the recess 8 is in the order of magnitude of one wire diameter, as is illustrated in Fig. 1.
• a wire can be reliably fed into or withdrawn from the bending holder, even if it is somewhat bowed, which is often the case when long wires are to be bent.
• the drive arm 10 is advantageously supported in the lateral direction by mutually opposing support surfaces on the bending holder, which in the securement position can absorb the tensile forces acting on the wire, and thus acting in the lateral direction on the drive arm 10, in connection with, for example, a bending moment.
• the frame has a lateral guide for the drive arm 10 in the form of a side wall 26, which interacts with a support lug 27 on the holder part 6.
• the support lug and the side wall are advantageously configured such that the opposite- situated support surfaces are active, i.e. interact in at least the securement position, but also in the two release positions.
• the drive arm does not interact in the outermost position, i.e. in the end position, but rather in the end position they are mutually displaced such that they are set free from one another.
• the drive arm can hence easily be exchanged for another drive arm, usually when the holder part, and thus the drive arm, is to be adapted to another wire dimension.
• the support surfaces can also interact in the end position.
• the mechanism is here configured such that the drive arm is allowed to be pulled off from the pin when the holder part is in the end position, but not in any of the operating positions. In other positions, the arm is barred from possible removal by either the support surfaces and/or another blocking part.
• FIG. 3 shows the holder part, with the recess 8, in its outer, raised release position with dashed lines.
• the inner release position differs insignificantly from the securement position.
• the distance between the positions in the y-direction is advantageously less than one wire diameter, so that the securement force on the wire ceases and the wire is free to be rotated about its longitudinal axis or displaced in its longitudinal direction.
• the wire is held in place in the lateral direction, i.e. in the y-direction and z-direction, during the rotation and the displacement.
• Fig. 4 shows a work bench 28 or equivalent in a bending machine for bending an object 2 such as a wire or wire blank by means of bending tools.
• the shown bending machine comprises two holder devices 1, two bending tools 29 and a centrally, fixedly placed centre holder 30.
• Like bending tools are known to the person skilled in the art and are not described in further detail.
• the bending tools are integrated with the holder devices to form a bending unit, the above-described holder device 1 according to the invention forming part of the machine and serving as a holder for the wire 2 during its bending.
• the centre holder 30 is intended both to secure the wire when the bending units move sideways in the bending machine, when the holder devices are in the inner release position, and also to rotate the wire about its longitudinal axis.
• the bending units are movably mounted on a slide or the like and can be moved in the longitudinal direction of the wire into chosen positions along the wire in which bending shall take place in a relative direction that is chosen by the rotational position for the wire chosen by the centre holder for each bending.
• the holder device 1 has an operationally reliable and simple construction, which can be realized at low cost. Furthermore, it is easily accessible when the holder device is to be adapted for different wire blanks and in the event of possible maintenance and adjustment. The fact that bending can be carried out in the vicinity of the holder device lends stability to the work operation. The operating problems which often occur with known devices due to lack of space are wholly eliminated if the device 1 according to the invention is used.
• the drive arm can be configured with a circular cross section in which the holder part is configured for lifting action in the outer release position and with lateral support.
• the drive motor can also be a linear motor, for example a hydraulic motor acting on the drive arm, which can be straight, appropriate flexibility being attainable through the choice of suitable characteristics for the drive motor.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Manipulator (AREA)
• Wire Processing (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

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Family Applications (1)

Country Status (5)

Family Cites Families (12)

• 2010
  • 2010-05-17 SE SE1050480A patent/SE534834C2/sv not_active IP Right Cessation
• 2011
  • 2011-05-16 WO PCT/EP2011/057866 patent/WO2011144562A1/en active Application Filing
  • 2011-05-16 JP JP2013510578A patent/JP5746327B2/ja not_active Expired - Fee Related
  • 2011-05-16 EP EP11719284A patent/EP2571638A1/en not_active Withdrawn
  • 2011-05-16 CN CN201180024267.9A patent/CN102917814B/zh not_active Expired - Fee Related

Non-Patent Citations (2)

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