EP2520384A1 - Coiling tool for spring coiling machines - Google Patents

Abstract

The tool has a tool holder (20) comprising a recess at an end area, where the recess forms a retainer (22) for a winding insert (23). The retainer is opened towards an end of the holder, where the insert is inserted into the retainer and fastened to the holder in a detachable manner. The retainer and the insert are designed in such a manner that relative movement between the insert and the retainer is blocked when the insert is inserted into the retainer. The recess is formed as a groove extending over the end area of the holder, where the insert is designed as an elongated insert.

Description

The invention relates to a wind tool for spring coiling machines, comprising a tool holder having a recessed recess on one end, which forms a receptacle for a winch insert, which is open towards the end of the tool holder and in which the winch insert used and in her solvable can be fastened to the tool holder.

The invention is based on a Windewerkzeug-arrangement, as used for spring winding machines or compression spring machines. In these machines, the wire is fed from a feeder against one or two wind fingers or wind pins and deflected by them on a circular path and formed in helical form.

Such wind tools can either be carried out in one piece by the tool holder and the wind insert is made in one piece, or even so that in the tool holder a winch insert is soldered.

From the EP 344 178 B1 It is known to use a wind tool, in which a winch insert replaceable and adjustable fastened in a tool holder and is held there by means of a claw assembly. Via a plurality of adjusting screws different orientations and positions of the respective winch insert can be adjusted. However, this known Windewerkzeug includes a variety of different, partly rotatable, individual elements, is quite complicated in its overall arrangement and requires a relatively large amount of space.

In another known wind tool ( US Pat. No. 7,055,356 B2 ) of the type mentioned above, the tool holder carries at one end a receiving groove with parallel side walls for holding a winch insert, wherein the groove towards the end of the tool holder is open and the winch insert with also parallel side surfaces whose width corresponds to the width of the groove in the groove each on the tool holder detachable by two in the longitudinal direction of the groove one behind the other arranged screws is attached. This wind tool assembly is quite simple in construction. If, however, a winch insert must be changed, the exact position of the winch insert is lost during the change, since the double screw fastening with which the winch insert (alone) is fastened in the receiving groove does not enable a precise securing of the position of the winch insert, which is why after the change of the winch insert the machine must be readjusted.

Based on this, the invention aims to improve a wind tool of the type mentioned in that it retains the exact same position even with a change in a very simple structure, small footprint and quick replacement of the winch insert while a new setting of the machine can be omitted ,

According to the invention, this is achieved in a wind tool of the type mentioned above in that the recording and the winch each have a shape such that when inserted into the recording wind insert positively a relative movement between the windscreen and recording is blocked.

In the case of the winding tool according to the invention, the receptacle and the winch insert are designed such that they form a positive engagement with each other when the winch insert is inserted into the receptacle, which prevents the occurrence of a relative movement between the two parts and thus in the longitudinal direction at the wind loading at the front of the winch insert the receiving groove effective loads on this mutual positive engagement of the shapes of recording and use of wind of the latter are transmitted to the tool holder problem-free, without causing the otherwise otherwise still existing releasable attachment of the winch insert on the tool holder to accommodate such loads. This makes it possible to design the releasable attachment between the winch and tool holder, for example by means of a screw so that it ensures only the connection between the two parts in the wind tool according to the invention. Since the relative movement between the wind insert and tool holder exclusive positive engagement, which is created by the shape of wind insert and recording already per se, a precise positive position positioning of the winch insert in the recording and thus ensures relative to the tool holder, this also applies in the case of a change of Winch insert when inserting a new winch insert into the receptacle. To change the use of wind thus requires only the release of the attachment z. As the screw, the removal of the previous use of wind, the insertion of a new winch insert into the receptacle and the subsequent re-Anschraubens the same. It is by the positive engagement of the forms of wind insert and recording the exact position of the winch on the Guaranteed tool holder even after the change, which saves time and costs when changing, because the machine is not reset every time.

The shapes of recording and use of wind, which lead to inserted into the recording wind insert that positive locking a relative movement between the two parts is blocked, can be varied and any person skilled in a variety of such shapes from his expertise is known that meet such a condition , Without thereby also a running out of the winch insert from the receptacle on the end of the tool holder towards open side is possible. Forms that meet this condition are, purely by way of example, z. As an embodiment of the recording in the form of a T-shaped recess at the end of the tool holder, wherein the central web of the T-shape to the end of the tool holder towards open cross section results and the shape of the winch insert in this case corresponding to this form of recording, also T-shaped design has. Furthermore, z. As can also be used in cross-section pentagonal forms for recording in which each of the corresponding shape along one of its polygon sides to the end of the tool holder is open. In this case, the corresponding area of the winch insert, which is inserted into the receptacle, provided with a same shape, wherein it protrudes in the inserted state at the open end of the recess via the tool holder in the direction of the location at which the Windeeingriff occurs ,

A trapezoidal shape for the recording would equally be used, in which case the shorter base line of the trapezoid forms the open towards the end of the tool holder point of the recording. Correspondingly, the section of the winch insert to be inserted into the receptacle would be designed in the same trapezoidal shape, whereby here at the point of the shorter baseline of the trapezoid the winch insert protrudes forward through the recess of the receptacle open outwards over the tool holder.

A particularly preferred embodiment of the invention Windewerkzeuges is when this is the recess in the form of a extending over the end portion of the tool holder groove is bounded on its sides by a respective side cheek, wherein the winch insert is shaped as an elongated insert and its Width of the width of the groove between the side cheeks, achieved in that the receptacle are provided on at least one of its side cheeks and the winch insert on its side in the inserted state facing side with the shapes for form-locking blocking a relative movement between the winch insert and recording, wherein, most preferably, these shapes are formed on both side walls of the receptacle and on both sides of the winch insert.

Here, the positive engagement to block the relative movement between the wind insert and recording is characterized in that in an otherwise rectilinear groove-shaped formation of the recording on at least one side, but preferably at both, a special shape is provided which causes the desired blocking effect. Such a lateral shaping on the receptacle (and correspondingly also on the section of the winch insert to be inserted into the receptacle) must only be suitable for preventing an axial slippage of the winch insert in the longitudinal groove when a wind load occurs in the longitudinal direction of the receptacle, wherein the side cheeks of FIG Nut block any relative movements in other directions already form fit, so that overall no relative movement between the winch and tool holder can occur. Such shapes on one or both side walls of the groove-shaped receptacle, which produce the desired blocking effect, are also familiar to the person skilled in the art on the basis of his specialist knowledge. This can be z. B. thereby achieve that on one or both side walls of the recording locally over a certain longitudinal extent range of the same time away a Nutverbreiterung or a groove narrowing is provided, in which case the inserted into the receptacle portion of the winch insert is provided with a complementary shape, so that at a local Nutverbreiterung the winch insert at the corresponding points on its sides complementary shaped lateral extensions which protrude into this Nutverbreiterung the recording and thus prevent a movement of the winch insert in the recording form-fitting. Completely analogous applies also to the case that a width of the receiving groove narrowing shape is provided on one or both side cheeks of the receptacle, in which case the shape of the inserted wind insert correspondingly assigned associated complementary side indentations, in which this groove constriction (s) protrude on one or both side walls of the recording. With such a configuration, a relatively simple construction of the invention Windewerkzeuges be achieved, which ensures the holder of the winch insert in the receptacle of the tool holder form-fitting immovable with little effort and small footprint, the otherwise releasable attachment between the two parts by other suitable means, such a fastening screw is ensured.

At the same time, however, precise positioning of the winch insert on the tool holder is determined by said positive engagement between the wind insert and recording, which, once the machine setting with a tool is done correctly, even when a tool change is precisely maintained, so that the new tool, as soon it in the Receptacle is inserted again in exact positioning and any kind of need to readjust the machine or even a new setting of the same completely eliminated.

A particularly advantageous embodiment of the invention is achieved in the aforementioned Windewerkzeug that on both side walls of the recording, and mirror images of each other, each one towards the center of the groove directed towards curvature and formed on both sides of the winch insert correspondingly shaped concavities. Preferably, the receptacle is symmetrical to a central longitudinal plane of the groove and, again preferably, the shape of the winch insert is formed symmetrically to a longitudinal center plane and to a transverse center plane thereof.

With these embodiments, a very advantageous and preferred embodiment of the invention can be realized, in addition to a very small footprint and the great advantage is achieved that can be used with a winch insert, in which at both axial end portions each have a working area (in shape a windrow), whereby each winch insert can be used in duplicate without the need for reworking. Is the winch use z. B. worn at one end, only the fixing screw is released, the winch insert taken out of the receptacle, rotated by 180 °, so that its previous rear end is to its front end, then inserted back into the receptacle and fastened with the screw. This is an extremely fast change of the tool, and without loss of its exact positioning, possible, thereby saving considerable time and cost when changing, as this is very quickly going on and the machine is not reset every time.

In addition, the tool holder can be made very slim with the result that in the case of z. B. two-finger wind system two such trained wind tools can be moved very tight laterally, so that thereby springs of a particularly large diameter range can be produced.

In this embodiment of the invention Windewerkzeugs is also to be noted that in such a fully symmetrical design of the winch insert (and symmetrically to the longitudinal axis, as well as to the central transverse axis) and the possibility given, at the front and back each have a Winderille attach, the unused rear groove can be attached protected, as this does not have to be present on the tool holder somehow and z. B. the Nuterstreckung the recording readily to a certain extent on the rear end of the inserted insert addition can be extended, whereby the then lying there second groove with inserted winch insert has a certain distance from the end of the groove.

In the wind tool according to the invention, the winch insert on the tool holder is preferably fastened by means of a screw whose central axis coincides with the line of intersection of the longitudinal and the transverse center plane of the winch insert, resulting in the problem-free rotation of the winch insert for moving its rear windrow forward (and the z. B. worn, broken o. Ä. Front groove to the rear) while maintaining the exact axial position of the winch use guaranteed.

Instead of a screw as a releasable attachment of the winch insert on the tool holder can be provided easily any suitable releasable attachment. In many applications, it is advantageous if the winch is attached to the tool holder by means of a releasable quick release.

The Windewerkzeug invention enables a simple, compact and inexpensive construction and a quick tool change, without causing the axial position of the Windewerkzeuges must be readjusted. Likewise, with the structure of the tool according to the invention in a particular embodiment of the same wind insert can be used twice, by at its front and its rear end in each case a Winderille is attached.

The wind tool according to the invention is installed in use in the machine and set its axial position once. The position and position of the tool holder must then not be changed. In the event of wear, breakage or the like of the winch insert, only the releasable fastening, preferably a screw, is opened, the winch insert is rotated or replaced and then the fastening screw is tightened again. In the wind tool according to the invention, the releasable attachment, such as the fastening screw, fixes the tool holder only in the direction perpendicular to the longitudinal direction of the tool holder, while the lateral absorption of the forces takes place by the positive engagement windage recording.

Fig.1

eine perspektivische Prinzipdarstellung einer Federwindemaschine (Zweifinger-Windemaschine), deren Windeeinheit mit erfindungsgemäßen Windewerkzeugen versehen ist;

Fig. 2

eine Perspektivdarstellung eines erfindungsgemäßen Windewerkzeuges mit eingelegtem Windeeinsatz, und

Fig. 3

eine Explosionsdarstellung des Windewerkzeuges aus Fig. 2.

The invention will be explained in more detail by way of example with reference to the drawing in principle. Show it:

Fig.1

a perspective schematic diagram of a spring winding machine (two-finger wind machine), the winch unit is provided with wind tools according to the invention;

Fig. 2

a perspective view of a Windewerkzeuges invention with inserted winch insert, and

Fig. 3

an exploded view of the Windewerkzeuges Fig. 2 ,

Fig. 1 represents in an oblique perspective view quite basically the structure of a spring coiling machine 1, in which at the front of a machine frame 2, first (left) a wire feed 3 is provided, the z. B. three pairs of wire feed rollers 9 is formed, which promote an endless wire 4 a wire guide 5 and advance through this into a wind station 6.

The wire feed rollers 9 of the wire entry 3 are of a in Fig. 1 not shown, programmable servomotor driven.

The wind station 6 has two superposed wind units 7a, 7b. Also, the wind station 6 is still a pitch device (in Fig. 1 not shown).

Furthermore, a cutting unit 8 is provided which comprises a movable cutting tool 11 which cooperates with a cutting mandrel 12 during the cutting operation.

Each winch unit 7a and 7b is equipped with a winching tool 10, which is respectively fixed to a lever 13a and 13b, wherein the levers 13a and 13b respectively by means of rollers 14a and 14b by a control cam 15a and 15b are moved. Each of the cams 15a, 15b is driven by its own programmable servomotor. But it is also possible, the two cams 15a and 15b of only a CNC-controllable servo motor (not shown) programmatically drive. The drive of the cam 15a and 15b is intermittently both forward and backward rotating.

Reference will now be made to the illustrations of FIGS. 2 and 3 , in which Fig. 2 a Windewerkzeug 10 in an oblique perspective view from above and Fig. 3 show the same wind tool 10 in an exploded view.

Like that FIGS. 2 and 3 can be removed, the Windewerkzeug 10 comprises an elongated tool holder 20, which at its one, in the assembled state of the conveyed wire 4 end region facing a recess recessed on one side 21, which, as especially Fig. 3 shows well, designed as a form of groove receptacle 22 for a winch insert 23 is formed. The recess 21 and in particular the receptacle 22 are open towards the front end of the tool holder 20, wherein in the case of a wind insert used in the receptacle 22 23 this protrudes through the open side of the receptacle 22 via the end of the tool holder 20 to the front.

The winch insert 23 is provided at its projecting end with a working area in the form of a winding groove 24. The conveyed wire 4 runs when using this Windewerkzeuges 10 against the Winderille 24 and is deflected by this on a circular path and formed into a helical shape.

In connection with this description, it should be noted that the use of the term "front" and "rear" respectively designate an indication in the direction of the open end of the receptacle 22 toward or away from it.

How in particular the representation of the Fig. 3 However, the winch insert 23 is not only on its front side, which protrudes in the installed state of the winch insert 23 at the front of the tool holder 20, but also at its opposite end also provided with a winding groove 24 in the mounted state, such as Fig. 2 shows, initially within the receptacle 22 is located, and by a distance a from the rear end wall 25 of the receptacle 22 away. By this distance a it is ensured that this inner end of the winch insert 23 with its Winderille 24 is not applied to the end wall 25 and thus 23 in the inserted state of the Windeeinsatzes no damage to the Winderille 24 can occur there.

The recording 22 becomes, as the representation of the Fig. 3 clearly shows, bounded laterally by side cheeks 26 and 27 and at its rear end by the end wall 25.

The side cheeks 26, 27 form in the longitudinal direction of the receptacle 22 lateral groove boundary walls 28, 29 ( Fig. 3 ), which in their rear portions, ie in their outgoing from the end wall 25 areas, initially parallel to each other, as the FIGS. 2 and 3 show in detail.

Subsequently, however, the inner walls 28, 29 of the receptacle 22 inwardly directed bulges 30, 31, which in the in the FIGS. 2 and 3 illustrated embodiment are cylindrical section shaped.

By this projecting towards the inside of the groove 23 outward bulges 30, 31, the groove width, which in the region of the parallel course of the inner walls 28, 29 of the side cheeks 26, 27 has the size B (see. Fig. 2 ), narrowed to a value b , as is the representation of the Fig. 3 shows.

In the area in front of the bulges 30, 31, ie in the very front region of the receptacle 22, then the full groove width B is again present (see. Fig. 2 ). There, the side walls 28, 29 of the receptacle 22 are parallel again.

As the FIGS. 2 and 3 Furthermore, the receptacle 22 (and not only this, but also the recess 21 and the entire tool holder 20) is formed symmetrically to a longitudinal center plane LL of the tool holder 20.

Likewise, the winch insert 23 is designed to be symmetrical both to the longitudinal center plane extending through its longitudinal center line MM and to its transverse center plane passing through its transverse center line QQ .

The shape of the winch insert 23 is further selected so that in the inserted state in the receptacle 22, where the protrusions 30, 31 on the side walls 26, 27 of the receptacle 22 are present, correspondingly complementary side indentations 32, 33 are provided on the winch insert 23, in which the bulges 30 and 31 of the side cheeks 26 and 27 engage positively with inserted winch insert 23.

As the FIGS. 2 and 3 show in detail, to which reference is made, the winch insert 23 within the area in which it is received in the receptacle 22, 26 and 27 laterally positively caught by the side cheeks.

By the engagement of the bulges 30, 31 of the side cheeks 26, 27 in the indentations 32 and 33 of the winch insert 23 this is positively held within the receptacle 22 of the tool holder 20 in the inserted state so that a relative movement between the winch insert 23 and the receptacle 22 and The tool holder 20 is not possible, as far as a complete positive blockage is present. For this purpose, it is also irrelevant that in the receptacle 22 in the area behind the rear end of the winch insert 23 and the rear end wall 25 of the receptacle 22 is present from the wind insert 23 no longer filled area of the receptacle 22.

The winch insert 23 is how Fig. 3 shows, both in the direction of the groove width, as well as in the longitudinal direction of the receptacle 22 where the bulges 30 and 31 of the side cheeks 26th and 27 are provided, relative to these centrally with a through hole 34 which there passes through the winch insert 23 over its entire height and whose central axis coincides with the intersection between the longitudinal center plane and the transverse center plane of the winch insert 23.

In the recording 22 is how Fig. 3 shows, attached to the groove bottom, a corresponding threaded bore 35 into which inserted in the receptacle 22 Winde insert 23 can be screwed through the through hole 34 inserted mounting screw 36 for attaching the winch insert 23 on the tool holder 20.

The axial length of the receptacle 22 is selected so that when inserted into the receptacle 22 and fixed wind insert 23 a small distance a between the rear end and the end wall 25 of the receptacle 22 remains.

By both in the transverse direction, as well as in the longitudinal direction of the central arrangement of the through hole 34 in the winch insert 23 and its both to its longitudinal center plane, as well as to its cross-median plane fully symmetrical configuration ensures that even when loosening the mounting screw 36 and a Turning the winch insert 23 by 180 ° about the central axis of its through hole 34 (for moving the rear windrow 24 forward and forwards the front, eg worn, broken or like affected wind groove 24 to the rear) after re-attachment in the receptacle 22 a position identical to its previous position in the groove 22 in the receptacle 22 occupies.

The symmetrical configurations of wind insert 23 and receptacle 22 allow the already mentioned dual use of the winch insert 23 by this can be provided both at its front and at its rear end with a respective Winderille 24 (as a working area), so that when loosening the screw 36th and removal of the winch insert 23 from the receptacle 22 of the winch insert 23 only has to be rotated to spend its rear side forward (and vice versa), after which it can be immediately re-inserted into the receptacle 22 and fixed there. In this way, an extremely rapid change of the working range of the windage insert 23 with only the shortest downtime of the machine for this change is possible.

But also the replacement of a tool insert 23 by another is also very quickly feasible, because this purpose only the loosening of the screw 36, the removal of the winch insert 23, the insertion of a new winch insert 23 in the receptacle 22 and its subsequent Befestigens means of the screw 36th on the tool holder 20 is required.

The shapes of the lateral bulges 30 and 31 on the side cheeks 26 and 27 of the receptacle 22 and the shape of the corresponding complementary indentations 32 and 33 on the winch insert 23 may well be formed in other than the shape shown in the figures, for. B. not in the form of a rounded, but a square cross-section.

Also, the bulges 30 and 31 on the two side cheeks 26 and 27 of the receptacle 22 to each other, viewed in the longitudinal direction of the tool holder 20, be offset, with the possibility of using a provided at its front and at its back with a winding groove 24 winds insert 23 then is also possible, provided that only the condition is met that the shape of the formations 30 and 31 on the two side walls 26 and 27, with inserted in the receptacle 22 wind insert 23 in the plan view point-symmetrical to the central axis of the through hole 34.

The mounting screw 36 is used with mounted winch insert 23 alone and exclusively to attach it to the tool holder 20 by pressing the winch insert 23 in the axial direction of the through hole 34 against the groove bottom of the receptacle 22.

All forces that are transmitted in mounted wind insert 23 and when using the Windewerkzeuges 10 in the practical operation of a spring coiling machine by the Windevorgang on the Winderille 24 on the winch insert 23, 26 and 27 of the tool holder 20 with the side surfaces facing by the lateral positive engagement of the side cheeks of the winch insert 23 is introduced directly into the tool holder 20 via the side cheeks 26 and 27, so that no portion of the fastening screw 36 is to be taken over by these forces when fastening the winch insert 23. The form-fitting mutually engaging bulges 30, 31 and indentations 32, 33 fix the winch insert 23 in the longitudinal direction of the tool holder 20th

Instead of the shapes shown could also be reversed on the winch insert 23 laterally cambering bulges and on the side cheeks 26, 27 bulges formed, but this should lead to a certain increase in the width of the Windewerkzeuges 10.

The FIGS. 2 and 3 clearly show how slim such a wind tool 10 can be executed.

Are in a two-finger winch, as in Fig. 1 is shown in principle, two wind tools 10 used, then they can be moved in their relative angular position to each other very close to each other, whereby almost all spring diameters can be produced.

Claims (8)

Winding tool (10) for spring winding machines (1), comprising a tool holder (20) having at one end a recessed recess (21) which forms a receptacle (22) for a winch insert (23), which extends to the end of the tool holder ( 20) open and in which the winch insert (23) can be used and in its releasably fastened to the tool holder (20), characterized in that the receptacle (22) and the winch insert (23) each have a shape such that when in the Recording (22) inserted wind insert (23) positively locking a relative movement between the winch insert (23) and receptacle (22) is blocked. Winding tool according to Claim 1, in which the recess is in the form of a groove (22) extending over the end region of the tool holder and delimited on its sides by a respective side cheek (26, 27), the winding insert (23) being elongate Insert is formed and its width (b, B) corresponds to the width of the groove (22) between the side cheeks (26, 27), characterized in that the receptacle (22) on at least one of its side cheeks (26, 27) and the winch insert (23) on its side facing in the inserted state side with the shapes (30, 31, 32, 33) for the positive locking of a relative movement between the winch insert (23) and receptacle (22) are provided. Winding tool according to Claim 2, characterized in that the shapes are designed to positively block a relative movement between the winch insert (23) and the receptacle (22) on both side cheeks (26, 27) of the receptacle (22) and both sides of the winch insert (23). Winding tool according to claim 3, characterized in that on both side cheeks (26, 27), mirror images of each other, each one towards the center of the receptacle (22) directed towards curvature (30, 31) and on both sides of the winch insert (23) correspondingly complementarily shaped Involutions (32, 33) are formed. Winding tool according to claim 3 or claim 4, characterized in that the receptacle (22) is formed symmetrically to its central longitudinal plane (LL). Winding tool according to one of claims 3 to 5, characterized in that the shape of the winch insert (23) is formed symmetrically to a median plane through the longitudinal axis (MM) and to a median plane through the transverse axis (QQ) thereof. Winding tool according to Claim 6, characterized in that the winch insert (23) is fastened to the tool holder (20) by means of a screw (36) whose central axis coincides with the mid-plane intersection through the longitudinal axis (MM) and the transverse axis (QQ) of the winch insert ( 23) coincides. Winding tool according to one of claims 1 to 6, characterized in that the winch insert (23) on the tool holder (20) is fastened by means of a releasable quick release.

Images