EP1048374B1 - Spring coiling arrangement, in particular for spring coiling machines - Google Patents

Description

The invention relates to a spring winch device, in particular for spring winch machines, for the production of either right-hand or left-hand coil springs made of wire.

In a known spring winch device for spring winch machines (DE-PS 896 186), two winch tools are used which are seated on sliders and which are coupled to one another in a movement-locking manner by a lever indirectly controlled by a cam disk. The one slide is arranged on one side of the wire guide and the other slide on the other side of the wire guide, both slides being linearly guided on a tool plate common to them. If this known device is to be converted in order to produce springs with a different wind direction, however, it is necessary to replace the existing winch apparatus with another winch apparatus, since different spring winch devices have to be used for springs of different wind directions.

In another known spring coiling machine (DE-OS 23 10 174), two winch apparatuses, each with a winch tool, are provided, the winch tool in the respective winch apparatus being able to be advanced linearly against the exit point of the wire on the wire guide by means of a carriage and a carriage guide. In addition, each of the two winches is pivotally mounted about a bearing axis which runs transversely to the axis of the wire guide and is located on the end section of the slide guide body facing away from the wire guide. This known spring winch device makes it possible that each tool moves linearly and at the same time swivels and can thus be used both as an internal and as an external winding tool. It is possible to change the wind direction without having to replace the entire winch. However, since no control means are provided to the two To be able to move wind tools against each other during the manufacture of springs, it is not possible to produce shaped springs with this known device.

A winch device, which can not only be used for the production of either right-hand or left-hand helical coil springs, but is also suitable for producing acylindrical helical springs, is described in DE-GM 92 13 164. Two winch devices are also used, each of which has a carriage guide body, in which a carriage is displaceably arranged so that a winch tool connected to the carriage is guided in a linearly movable manner relative to the wire exit point of the wire from the wire guide. Each carriage guide body can be pivoted at its end region facing away from the wire guide about a pivot axis directed perpendicular to the wire guide axis and parallel to a central plane running through the wire guide axis, both winch apparatuses being arranged on different sides of this central plane. Each of the two winch devices is assigned its own cam mechanism, which in one winch device pushes the carriage back and forth in its guide, while in the other winch device it swings the carriage guide body back and forth and both movements are program-controlled with respect to one another. If a change of the wind direction of the coil springs to be produced is now to take place in this known winch device, however, it is necessary to carry out a plurality of mechanical changeover work, in particular a change of the kinematic gears between the cam disk and the winch device and a change to devices on the winch devices themselves, which is still necessary is always relatively complex and cumbersome.

From DE-OS 198 25 970 a spring manufacturing device is known in which two tool units are used, each of which is fastened to a plate which is movable in the wire guide direction on a further plate which in turn can be moved perpendicular to the wire guide direction. This allows each tool unit to be moved independently of one another in two mutually perpendicular coordinate directions, which allows the tip of the tool that carries it to approach any point. In this known device, a change of the spring winding direction is possible without the implementation of noticeable conversion devices and can essentially be carried out by changing the program control. However, this known spring winch device requires the use of four servomotors working independently of one another and a large number of individual elements arranged on top of one another and movable relative to one another, which means a very great outlay.

Proceeding from this, the invention has for its object to provide a spring winch device of the type mentioned, in which the change of the wind direction of the springs produced is possible while largely avoiding mechanical changeover work, and which nevertheless has a relatively simple structure.

According to the invention, this object is achieved by a spring winch device, in particular for spring winch machines, for the production of either right-hand or left-hand helical coil springs made of wire, with feed rollers for conveying the wire along a wire guide axis through a wire guide, with two winch apparatuses, each of which has a slide guide body in which one Carriage is slidably arranged so that a winch tool connected to the carriage is linearly movable relative to the wire exit point of the wire from the wire guide, with each carriage guide body at its end region facing away from the wire guide about a perpendicular to the wire guide axis and parallel to a central plane running through the wire guide axis Directional pivot axis is pivotable, both winches are arranged on different sides of this central plane, each winch is a drive for moving the carriage and one of one Cam-controlled cam mechanism is assigned for pivoting the carriage guide body about the pivot axis, the cam mechanisms of both winches being assigned a common cam disc that can be pivoted by a program-controlled motor, with two control sections and at least one latching section, each control section also being used to initiate control movements in one of the two cam mechanisms and each latching section is designed to initiate no control movements in the cam gear, and by turning the cam disc one of the control sections for producing coil springs in a wind direction can be switched on to the associated cam gear for actuating it, while the other cam gear on the or one of the Resting section (e) is present, and wherein the controlled cam mechanism interacts with the drive for the movement of one of the slides under program control, while the drive of the other Sc hlittens is deactivated.

In the spring winch device according to the invention, given the motor mobility of each tool holder in two directions of movement, the manufacture of non-circular springs is possible, a reduced adjustment effort and the repeatability of settings are ensured, and the spring can be automatically wound without manual intervention for the first winding. Through the use of a common cam plate assigned to the two cam mechanisms, which only has to be rotated by a certain angle to switch on one or the other cam mechanism, this is Conversion effort to change from right-hand to left-hand winches minimized, since only the individual tool settings have to be made on the tool holder.

In addition, in the spring winch device according to the invention there is also an increased rigidity of the overall arrangement due to a more favorable flow of force and the increased assembly and maintenance expenditure for the belt drive, as is required in the arrangement from DE-GM 92 13 164. It is also possible with the spring coiling machine according to the invention to achieve a constant load torque over the entire spring diameter range (with the same wire diameter and based on the forming forces) by using a specially calculated curve law.

The cam disk used in the invention, which is common to both cam drives, leads to the fact that only three servomotors have to be provided in total, and the entire basic principle of the spring winch is thereby covered with three axes. All advantages can only be achieved by using a third motor, without the need to use a further motor, as is used in the known spring winch device according to DE-OS 198 25 970. In addition, the complicated arrangement of stacked tables, which are also used in this prior art and can be moved relative to one another in different directions, for the tool carrying devices and the, likewise quite complicated connection mechanism on the one table, which, when a second table moves, moves two further tables is required to be completely dispensed with.

The individual motors for driving the common cam as well as for the two drives for moving the slides are coupled to one another via an electronic program control, which ensures that the motors used for the winding of Fedem in one direction of wind each carry out the movements that are program-controlled precisely are required for the production of the desired spring shape.

In an advantageous embodiment of the invention, the cam mechanism of one winch apparatus works with the drive for the movement of the carriage of the other winch apparatus in a program-controlled manner, as a result of which coil springs of a wind direction can be produced in the two-finger system. If springs of the other wind direction are to be generated, the cam mechanism of the other winch device is interconnected with the other drive for the linear movement of the slide.

If the spring winch device according to the invention is to effect the forming process when the wire is fed in the one-finger system, the cam mechanism of a winch device is preferably program-controlled coupled to the drive for the movement of the carriage of the same winch device, i.e. one winch is in use while the other winch is inactive.

If helical springs with a different wind direction are to be produced in the single-finger winch system, then the cam mechanism of the other winch device is preferably program-controlled coupled to the drive for the movement of the carriage in this winch device.

In the spring winch device according to the invention, any suitable type of drive can in principle be used as the drive for the movement of the carriage in any winch apparatus. It is very particularly preferred, however, if a cam which can be rotated by a program-controlled motor is provided as the drive for the movement of the carriage in each winch apparatus, the cam movement of which is transmitted to the carriage in a force-controlled manner. This has the great advantage that, due to the positive guidance, the weight and acceleration forces that occur do not impair the accuracy of the movement of the slide or tool holder.

In the spring winch device according to the invention, the axis of rotation of the cam disk common to the two cam drives is particularly preferably arranged in such a way that it intersects the extension of the wire guide axis perpendicularly and lies in the central plane. As a result, a mirror-symmetrical arrangement of the cam mechanisms can be achieved on both sides of the central plane, which in both wind directions of the springs leads to the same loads on the cam mechanism that is switched on.

Equally preferably, in a spring winch device according to the invention, the winch apparatuses are also arranged mirror-symmetrically to the wire guide axis, whereby - again preferred - they are designed mirror-like to one another.

In another preferred embodiment of the invention, a guide plate is attached between the winch apparatus and symmetrically to the wire guide axis in its extension and at a distance from the wire exit point, which has a guide track on both of its sides facing the winch apparatus, on which the facing end of the slide guide body of the concerned winch slides.

• Fig. 1 eine prinzipielle Vorderansicht einer erfindungsgemäßen Federwindeeinrichtung, eingerichtet zur Herstellung rechtgewundener Schraubenfedem im Zweifinger-Windesystem;
• Fig. 2 einen vertikalen Längsschnitt entsprechend Linie II-II in Fig. 1;
• Fig. 3 einen vertikalen Längsschnitt entsprechend Linie III-III durch den Schwenkantrieb der in Fig. 1 dargestellten Federwindeeinrichtung;
• Fig. 4 einen Schnitt entsprechend Linie IV-IV durch eine Einzelheit in Fig. 1;
• Fig. 5 die Federwindeeinrichtung aus Fig. 1, eingerichtet zur Herstellung linksgewundener Schraubenfedern;
• Fig. 6 eine Ansicht der Federwindeeinrichtung nach Fig. 1, aber eingerichtet zur Herstellung rechtgewundener Schraubenfedern im Einfinger-Windesystem, und
• Fig. 7 einen Schnitt entsprechend Linie VII-VII durch den oberen Windeapparat der in Fig. 6 dargestellten Federwindeeinrichtung.

In the following the invention is explained in principle by way of example by means of the drawing. Show it:

• Figure 1 is a schematic front view of a spring winch device according to the invention, set up for the production of right-hand coil springs in the two-finger winch system.
• Figure 2 is a vertical longitudinal section along line II-II in Fig. 1.
• 3 shows a vertical longitudinal section along line III-III through the swivel drive of the spring winch device shown in FIG. 1;
• 4 shows a section along line IV-IV through a detail in Fig. 1.
• FIG. 5 shows the spring winch device from FIG. 1, set up for producing left-hand coil springs;
• Fig. 6 is a view of the spring winch device of FIG. 1, but set up for the production of right-hand coil springs in the single-finger winch system, and
• Fig. 7 is a section along line VII-VII through the upper winch apparatus of the spring winch device shown in Fig. 6.

The spring winch device 10 shown by way of example in its structural details is part of a spring winch machine (not shown) with feed rollers 12 driven by a CNC-controllable servo motor (not shown), which feed a wire 14 straight and horizontally through a wire guide 16 into a wind station 18, in which the wire 14 through two winch tools 20 and 22, which are designed in the form of winch fingers, from two winch attachments 30 and 32 fastened to one another on a winch plate 26 of the spring winch machine, depending on the position of the two winch tools 20 and 22, to right-hand or left-hand winders Coil springs is molded, ie Depending on whether a right-hand or a left-hand coil spring is to be produced, the wire 14 is deflected upward or downward with respect to the wire guide axis 34.

Each of the two above and below the wire guide axis 34 and a winch apparatus 30 and 32 arranged through this center plane MM consists of a slide guide body 36 and 38, on which a slide 40 and 42 by means of a commercially available linear guide unit 43, the guide rail of which is attached to the slide guide bodies 36 and 38 and the guide carriage of which are attached to the slide 40 and 42, is longitudinally displaceable. Each of the slides 40, 42 carries, at its end facing the wire guide 16, a pivotally mounted holder 44 or 46 in which the upper winch tool 22 or the lower winch tool 24 is fastened

Each of the two slide guide bodies 36 and 38 is pivotally mounted on its end region facing away from the winch tool 22 or 24 on an axis designed as a frame-fixed bolt 48 or 50 on the winch plate 26. The tool-near end of each slide guide body 36 or 38 is rounded with a radius around the axis of the bolt 48 or 50. With these ends, both slide guide bodies 36 and 38 lie on a coplanar guide plate 52 with lateral tracks 54 facing the slide guide bodies 36 and 38 accordingly designed, concave contour on both sides.

As can be seen from the sectional view in FIG. 2, in the end region of the slide guide body 36 and 38 facing away from the wire guide axis 34, a gear 60 and 62 is centered in a receiving bore, to each of which a program-controlled, intermittently back and forth rotating servo motor 64 or 66 is flanged on the input side. A control cam 68 and 70 is rotatably connected to the drive shafts of the two gears 60 and 62. On the control cams 68 and 70, two rollers 72 and 74 each run, which are each rotatably arranged on a bolt 76 and 78 fastened to the upper slide 40 and lower slide 42 (FIG. 2), as a result of which the movement of the Carriage 40 and 42 is forcibly guided by the rotary movement of the control cams 68 and 70.

In extension of the wire guide axis 34, a further gearbox 84 is flanged in the winch plate 26 of the spring coiling machine in a remote receiving hole perpendicular to the wire guide axis 34, with its central axis passing through this and lying in the central plane MM, at the input of which another CNC-controllable, intermittent forward and backward rotating servo motor 86 is attached. On the output side, a disk-shaped control cam 88, which is designed as a bead curve and on which two rollers 90 and 92 each run in a positively guided manner, is seated on the gearbox 84 in a rotationally fixed manner, each of which has an angular, one-armed lever 98 and 100 are rotatably arranged. The two bolts 94 and 96 are arranged on different sides of the drive shaft of the gear 84 and at the same distance from it, perpendicular to the wire guide axis 34, one above the other (FIG. 3).

In each case one coupling articulated rod 106 and 108 is articulated by means of bolts 110 and 112 on the one hand approximately centrally on the lever 98 and 100 on the other hand and on the other hand by means of bolts 114 and 116 on the slide guide body 36 of the upper winch apparatus 30 and on the slide guide body 38 of the lower winch apparatus 32.

The mode of operation of the spring winch device shown for producing right-handed coil springs in the two-finger winch system is described below with reference to FIGS. 1 to 4:

For the form drive of the winch tool 20 of the upper winch apparatus 30 for adjusting the spring outer diameter during spring manufacture, the servomotor 64 is activated, which drives the control cam 68 program-controlled, intermittently rotating forward and backward. The radial movement of the control cam 68 becomes above the rollers 72 transferred to the carriage 40 of the upper winch apparatus 30 and the upper winch tool 20 is moved linearly back and forth in a closer / front or further / rear oblique position relative to the wire exit point of the wire 14 on the wire guide 16

The movement of the wind tool 22 of the lower winch apparatus 32, which is lawfully coordinated with the movement of the upper winch tool 20, is predetermined by the control cam 88, which is correspondingly driven by the servo motor 86 via the gear 84. The movement of the control cam 88 is transmitted via the rollers 92 to the pivotable lever 100 and further via the coupling articulated rod 108 to the lower slide guide body 38. As a result, the slide guide body 38 guides a positively controlled to and fro with the winch tool 22 of the lower winch apparatus 32 pivotal movement about the axis of the bolt 50 as a pivot center. The lower winch tool 22 is thus also moved to a front and rear position with respect to the wire exit point on the wire guide 16 by means of the cam mechanism 88, 92 and 100.

The winch tools 20 and 22 of the upper and lower winch apparatus 30 and 32 are shifted (at least predominantly) at the same time according to a structurally determined law. The specially calculated curve laws of the two control cams 68 and 88 in conjunction with the two program-controlled, intermittently forward and reverse rotating servomotors 64 and 86 are used for this purpose.

It should also be noted that the control curve 88 in addition to two control sections, which are used to initiate control movements in one or the other of the two Cam gear are designed, provided over certain areas of their circumference with two locking sections, ie above this rotation range of the curve of the control cam 88 there is no control movement on the transmission members. In the case of right-hand winding of a helical spring, the latching section of the control cam 88 is responsible or effective for the upper winch apparatus 30, which therefore does not perform a pivoting movement about the bolt 48 here.

The upper winding apparatus 30 is also rigidly fixed via the cam roller 90, the lever 98 and the coupling joint rod 106 and their connecting bolts 110 and 114.

It should also be noted that the CNC-controllable servo motor 66 of the lower winch apparatus 32 is switched off in a program-controlled manner when winds to the right. However, it can be used to automatically bend the first wire winding through the lower winding tool 22.

The changeover of the two winches 30 and 32 from one wind direction to the other wind direction, e.g. B. from the right-hand winch shown in Figure 1 in the rearrangement shown in Figure 5 for left-hand winds, is done by the machine control without any additional conversion work (apart from moving the cutting dome and the cutting tool of the machine).

The servomotors 64 and 66 move after inputting "left-hand winds" the upper and lower winch tools 20 and 22 in their rearmost position, which is most retracted from the wire guide 16, while the servo motor 86 then continues to turn the control cam 88 until the Locking section of the control cam 88 is now effective for the lower winch 32. The subsequent setting of the initial diameter of a form spring or the outside diameter of a cylindrical helical spring is then carried out by switching on both servomotors 64 and 66, which legally shift the winding tools 22 and 24 to one another to the required extent. Then the drive motor 64 of the upper winch apparatus 30 is switched off or used for the automatic bending of the wire of the first spring turn by the upper winch tool 20. The coordinated movement of the winch tool 20 of the upper winch apparatus 30 required for producing a left-hand shaped spring is carried out via the control cam 88 driven by the servo motor 86. The transmission of the control cam 88 is now carried out via the two rollers 90 to the pivotable lever 98 and further above the coupling joint rod 106 and the bolts 110 and 114 on the upper slide guide body 36, which thereby swings back and forth about the axis of the bolt 48 as the pivot center and thus moves the winch tool 20.

The linear movement of the lower winch tool 22 takes place through the control cam 70 driven by the servo motor 66 via the rollers 74 and the slide 42.

The winch tool 20 of the upper winch device 30 now serves as an inner tool in the manufacture of left-hand wound spring bodies and the winch tool 22 of the lower winch device 32 as an outer winch tool; while for right-hand coil springs, the upper tool 20 serves as an external winding tool and the lower tool 22 serves as an internal winding tool ("inside" and "outside" being used in accordance with the terminology given in DE-OS 2 310 174).

FIGS. 6 and 7 show the spring winch device set up for producing right-handed coil springs in the single-finger winch system.

In this single-finger winch device, the motorized movement of the only winch tool 120 here takes place in two directions of movement, as is described in more detail below with reference to FIGS. 1 to 7.

The only winch tool 120 is fastened to a holder 122 on the slide 40 of the upper winch apparatus 30, the slide 40 being forcibly guided back and forth via a cam disk 68 and rollers 72 seated on bolts 76. The cam disk 68 itself is driven intermittently back and forth by the program-controlled servo motor 64 (FIG. 7) via the gear 60. At the same time as this linear and oblique movement, a program-controlled swiveling movement of the upper slide guide body 36 about the axis of the bolt 48 as a swiveling center takes place (or can take place). This pivoting movement is transmitted by a CNC-controllable servo motor 86 via a gear 84 to a control cam 88 (as shown in FIG. 3) and from there via two rollers 90 to the lever 98 pivotable on pin 94 and further via a coupling articulated rod 106 via bolts 110 and 114 to a slide guide body 36 of the upper winch apparatus 30.

The carriage 42 of the lower winch apparatus 32, which is inactive for production here and whose winch tool holder is removed, was moved into its retracted rear position by the servo motor 66 (as in FIG. 2) and the control cam 70.

Due to the previously described, controlled linear movement of the winch tool 120 above the carriage 40, which, however, interacts with the controlled pivoting movement of the carriage guide body 36, the active surface of the winch tool 120 can move through any required course of movement.

The lower winch 32 is in use to produce left-hand coil springs in the single-finger winch system, while the upper winch 30 is now inactive. The straight line movement of the winch tool, not shown, now takes place from the servo motor 66 from above the cam plate 70, and the pivoting movement of the lower slide guide body 38 about the bolts 50 from the servo motor 86, which previously rotated the control cam 88 so far that its locking area is now for the upper inactive winch apparatus 30 is responsible, above this control curve 88 on the lever 100 and from here above the coupling articulated rod 108 on the slide guide body 38.

In principle, left-hand coil springs can also be produced with the winch tool 120 of the upper winch device 30. All that is required is that the winding apparatus 30 has been moved upwards by the servo motor 64 so that the winding tool 120 now engages the wire 14 on the other side, that is to say above the wire guide axis 34, and acts downward, while for the previously coiled coil springs, this Winding tool 120 attacked wire 14 below wire guide axis 34 and moved upward.

As can be seen from FIGS. 1, 5 and 6, the two winch apparatuses 30 and 32 are arranged mirror-symmetrically to the wire guide axis 34 on the winch plate 26 and are designed to be mirror-like to one another.

In all of the above-described wind methods, non-circular helical springs can also be produced by the separate control of the winch tools, or it is possible to wind spring forms which have different wind radii within one spring turn.

Claims (9)

1. Spring winding device, particularly for spring winding machines, for producing, selectively, right-hand or left-hand helical springs from wire, with pull-in rollers (12) for transporting the wire (14) along a wire guide axis (34) through a wire guide (16), with two winding apparatuses (30; 32), each of which has a slide guide body (36; 38) in which a slide (40; 42) is displaceably arranged in such a way that a winding tool (20; 22) connected with the slide (40; 42) is guided so as to be moveable linearly relative to the point at which the wire (14) exits the wire guide (16), wherein every slide guide body (36; 38) is swivelable at its end region remote of the wire guide (16) around a swiveling axis (48; 50) directed vertical to the wire guide axis (34) and parallel to a center plane (M-M) extending through the wire guide axis (34), the two winding apparatuses (30; 32) being arranged on different sides of this center plane (M-M), wherein a drive (64, 68; 66, 70) for the movement of the slide (40, 42) and a cam drive (90, 98, 106; 92, 100, 108) controlled by a cam disk (88) for swiveling the slide guide body (36; 38) about the swiveling axis (48; 50) are allocated to each winding apparatus (30; 32), wherein a shared cam disk (88) which is swivelable by a program-controlled motor (86) and has two control portions and at least one rest portion is allocated to the cam drives (90, 98, 106; 92, 100, 108) of both winding apparatuses (30; 32), each control portion is configured for introducing controlling movements in one of the two cam drives (90, 98, 106; 92, 100, 108) and every rest portion is configured for introducing no controlling movements in the cam drive (90, 98, 106; 92, 100, 108), and, by rotation of the cam disk (88), one of the control portions for producing helical springs in one winding direction can be connected to the associated cam drive (90, 98, 106; 92, 100, 108) for control thereof, while the other cam drive (90, 100, 108; 90, 98, 106) contacts the rest portion or one of the rest portions, and wherein the controlled cam drive (90, 98, 106; 92, 100, 108) cooperates in a program-controlled manner with the drive unit (64, 68; 66, 70) for the movement of one of the slides (40; 42), while the drive unit (66, 70; 64, 68) of the other slide (42; 40) is switched off.
2. Spring winding device according to claim 1, wherein the cam drive (90, 98, 106; 92, 100, 108) of a winding apparatus (30; 32) cooperates in a program-controlled manner with the drive unit (64, 68; 66, 70) for the movement of the slide (40; 42) of the other winding apparatus (32; 30).
3. Spring winding device according to claim 1 or 2, wherein a cam disk (68; 70) which is rotatable by a program-controlled motor (64; 66) is provided as a drive unit for the movement of the slide (40; 42) in every winding apparatus (30;.32).
4. Spring winding device according to claim 3, wherein the slide (40; 42) of every winding apparatus (30; 32) is positively guided at the rotatable cam disk (60; 70).
5. Spring winding device according to one of claims 1 to 4, wherein the axis of rotation of the cam disk (88) common to the two cam drives (90, 98, 106; 92, 100, 108) lies in the projection of the wire guide axis.
6. Spring winding device according to one of claims 1 or 3 to 5, wherein the cam drive (90, 98, 106; 92, 100, 108) of a winding apparatus (30; 32) cooperates in a program-controlled manner with the drive unit (64; 66) for the movement of the slide (40; 42) of the same winding apparatus (30; 32).
7. Spring winding device according to one of claims 1 to 6, wherein a guide plate (52) is arranged between the winding apparatuses (40; 42) and symmetric to the wire guide axis (34) in the projection thereof and at a distance from the wire outlet, which guide plate (52) has a guide path (54) on its two sides facing the winding apparatuses (30, 32), the facing end of the slide guide body (36; 38) of the winding apparatus (30; 32) in question sliding on this guide path (54).
8. Spring winding device according to one of claims 1 to 7, wherein the winding apparatuses (30, 32) are arranged mirror-symmetric to the center plane (M-M).
9. Spring winding device according to one of claims 1 to 8, wherein the winding apparatuses (30, 32) are constructed mirror-symmetric to one another.