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(11) | EP 0 536 167 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
BENDING MACHINES BIEGEMASCHINEN MACHINES A PLIER |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] This invention concerns a wire bending machine comprising a bending head having a slot for receiving at least one length of wire and a retaining device movable into a retention position so as to close the open end of the slot, so that during bending the wire is retained in the slot, as for example known from GB-A-2072552.
Background to the invention
[0002] Bending machines are known in which the wire to be bent is inserted laterally into a bank of bending heads in each of which at least one length of wire is retained by a device such as a ball catch. This insertion operation is usually manually performed by the machine operator; and it has been found, particularly where a long length of wire is to be bent, that difficulties are frequently experienced by the operator in correctly inserting the wire.
Summary of the invention
[0003] According to the present invention there is provided a wire bending machine according to claim 1.
[0004] By this means the wire can more rapidly be set up in the bending head and is also more positively located in the slot.
[0005] Where the bending head is movable relative to the remainder of the machine in a direction along the length of the wire (before bending), the retaining device may form part of the bending head.
[0006] The retaining device comprises a pivotal lever movable by a ram into a forward position, and a hold-back device engages with a central part of the lever to cause pivoting of the lever into a retention position, in which it is substantially perpendicular to the slot in the bending head.
Brief description of the drawings
[0007] An example of the invention will now be described, with reference to the accompanying drawings, in which:
Figure 1 is a side view of a bending machine embodying the invention; and
Figure 2 is a detail of the head of the bending machine.
Detailed description
[0008] Referring first to Figure 1 there is shown the general outline of a wire bending machine. A coil of wire is fed from a decoiling unit 2, to a straightening unit 4 comprising two sets of opposed rollers, one set having rollers rotatable about horizontal axes while the other set has rollers rotatable about vertical axes.
[0009] To the right of the straightening unit the wire is fed to a cropping or shearing unit 6. The severed length of wire is now held by three transfer units, and to the right of the transfer unit is an end trimmer adapted to trim the leading end of the wire.
[0010] Beneath the transfer unit are mounted two banks 12 of bending heads. Each bank 12 comprising four bending heads slidable under computer control along a horizontal slide. Between the two banks of bending heads is a rotatable clamp 14.
[0011] Referring now to Figure 2, there is shown one bending head 16 rotatable about a horizontal axis and formed with a slot 18 in which a plurality of wires 20, in this case three wires, are receivable.
[0012] Inboard of the bending head 16, to the right as viewed in Figure 2, is a hydraulic cylinder or ram 22 mounted from a frame 24 of the bending head on which the bending head is individually slidable, as above-mentioned.
[0013] Projecting from the cylinder 22 is an actuating rod 26 slidable in a journal bearing 28 forming part of the frame 24.
[0014] Fixedly mounted on the rod 26 between the cylinder 22 and the journal bearing 28 is a block 30 in which is slidably carried a smaller rod 32, also slidable in the bearing 28. Pinned to the rod 32 is a further block 34 through which the actuating rod 26 is slidable, a compression spring 3G being located around the rod 26 between the blocks 30 and 34, to urge the block 34 into a forward position.
[0015] At the front end of the block 34 is an abutment 38 which on forward movement of the rod 26 abuts with an adjustable screw 40 secured to the bearing 28.
[0016] Pinned to the forward end of the smaller rod 32 is an end block 41 through which the forward end of the actuating rod 26 is also slidable.
[0017] Pivoted about the forward end of the actuating rod 26 is a finger or lever 42 to the middle of which is also pivoted a link 44 pivotal about the end block 41.
[0019] Starting with the actuating rod 26 in its withdrawn position, as shown in solid lines, the hydraulic cylinder 22 is actuated, causing the actuating rod 26 and the smaller rod 32 to extend forwards, ie to the left as viewed in Figure 2. Both rods continue to be extended until the abutment 38 meets the screw 40, which arrests movement of the smaller rod 32. During further movement of the rod 26 against the pressure of the compression spring 36, the block 30 slides along the smaller rod 32 until the block 30 meets the abutment block 34. During this movement the right hand pivot of the link 44 is stationary so that the outward movement of the rod 26 causes clockwise rotation of the lever 42 until it is in an upright position, as shown chain dotted. In this position the free end of the lever 42 is positioned adjacent the slot 18 in the bending head so that it pushes the wire 20 into the slot and retains it therein.
1. A wire bending machine comprising a bending head (16) having a slot (18) for receiving
at least one length of wire (20) and a retaining device movable into a retention position
so as to close the open end of the slot (18), so that during bending the wire (20)
is retained in the slot (18), wherein the retaining device comprises a pivotal lever
(42) movable by a ram into an extended position, and a hold-back device (44) engageable
with a central part of the lever (42) to cause pivoting of the lever (42) into said
retention position in which the lever (42) is substantially perpendicular to the slot
(18) in the bending head (16).
2. A machine according to claim 1 in which the bending head (16) is movable relative
to the remainder of the machine in a direction along the length of the wire (20) (before
bending), the retaining device forming part of the bending head (16).
3. A machine according to claim 2 in which the ram comprises an actuating rod (26), the
lever (42) being pivoted to the free end of the rod (26).
4. A machine according to claim 3 in which the hold-back device comprises a link (44)
pivoted between the central part of the lever (42) and a block (41) movable with the
rod.
5. A machine according to claim 4 in which the hold-back device further comprises an
adjustable abutment (38,40) secured to a fixed part (28) of the machine, the block
(41) being slidable on the rod (26) when the block (41) is arrested by the abutment
(38,40).
1. Drahtbiegemaschine enthaltend einen Biegekopf (16), mit einem Schlitz (18) zur Aufnahme
von mindestens einer Länge eines Drahtes (20) und einer in eine Rückhalteposition
bewegbare Rückhaltevorrichtung um das offene Ende des Schlitzes (18) zu schliessen,
so dass während dem Biegen der Draht (20) im Schlitz (18) zurückgehalten ist, wobei
die Rückhaltevorrichtung einen Schwenkhebel (42), welcher mittels einer Ramme in eine
ausladende Position bringbar ist, und eine am mittleren Teil des Hebels (42) angreifende
Rückhalteeinrichtung (44), welche dafür sorgt, dass der Hebel (42) in die erwähnte
Rückhalteposition, in welcher der Hebel (42) annähernd rechtwinklig zum Schlitz (18)
in den Biegekopf(16) schwenkt, umfasst.
2. Maschine nach Anspruch 1, bei welcher der Biegekopf (16) relativ zum restlichen Maschine
in einer Richtung längs zum Draht (20) (vor dem Biegen) bewegbar ist, wobei die Rückhaltevorrichtung
Teil des Biegekopfes (16) ist.
3. Maschine nach Anspruch 2, in welcher die Ramme einen Betätigungsstab (26) umfasst,
wobei der Hebel (42) am freien Ende des Betätigungsstabes (26)angelenkt ist.
4. Eine Maschine nach Anspruch 3, in welcher die Rückhalteeinrichtung eine Verbindung
(44) umfasst, welche zwischen dem mittleren Teil des Hebels (42) und einem mit dem
Betätigungsstab (26) bewegbaren Block (41) angelenkt ist.
5. Maschine nach Anspruch 4, in welcher die Rückhalteeinrichtung im weiteren ein justierbares,
an einem festen Teil (28) der Maschine befestigtes Widerlager (38,40) umfasst, wobei
der Block (41) am Betätigungsstab (26) gleitet, wenn der Block (41) am Widerlager
(38,40) anschlägt.
1. Machine à plier les fils comprenant une tête à plier (16) avec une coupure (18) pour
lever au moins une longeur du fil (20) avec encliquetage mobile a une position de
retenue pour fermer le bout ouvert de la coupure (18) de sorte que pendant le pliage
le fil (20) est retenue dans la coupure (18) et l'encliquetage contenant un levier
pivotant (42) qui est mobile dans une position pivotante par un mouton et avec dispositif
de retenue (44) articulé au millieu du levier (42) assurant que le levier (42) se
pivote approximativement perpendiculaire à la coupure (18) dans la tête a plier (16).
2. Machine selon revendication 1 avec la tête à plier (16) qui est mobile en direction
longitudinal au fil (20) relativement au reste de la machine avant le pliage et où
l'encliquetage fait partie de la tête à plier (16).
3. Machine selon revendication 2 dont le mouton comprends une barre à actionner (26)
et où le levier (42) est pivoté au bout libre de la barre à actionner(26).
4. Machine selon revendication 3 dont l'encliquetage comprends un raccord (44) qui est
pivoté entre la partie centrale du levier (42) et un bloc (41) mobile par la barre
à actionner (26).
5. Machine selon revendication 4 dont l'encliquetage comprends un aboutissement réglable
qui est attaché à une partie fixe (28) de la machine où le bloc (41) glisse à la barre
à actionner (26) si le bloc est arreté par l'aboutissement.