DE8030608U1 - DEVICE FOR WINDING WIRE SCREWS - Google Patents

Description

Stw .: spiral head mandrel conical-cylindrical Womako file 668 - Niirtingen, Nov. 13, 1980

Device for winding wire screws

The invention relates to a device for winding wire screws with one driven and one conical widening winding area having winding mandrel and one corresponding to the slope of the to be wound Turns of the wire screw shaped stationary guide that guides the wire and the turns axially on the Winding mandrel advances.

Devices of the aforementioned type are known in large numbers from the patent literature, including, for example, on the DE-PSs 337.096, 362.058, 1.902.623, 1.944.371, the DE-OSs 2.234.633, 2.835.511 and the US-PSs 3.101.750, 3,378,045 is pointed out. All the known devices What they have in common is that they have a relatively long mandrel that is conically shaped from the wire inlet to the wire outlet exhibit. The wire is guided onto this mandrel by a stationary guide, e.g. one with a helical guide Grooved socket, or of several rows according to the pitch of the turns of the to be wound Wire screw arranged guide elements, such as pins or ball bearings, axially advanced to the winding mandrel, the wire being stretched due to the conicity of the winding mandrel and thus permanently deformed. To the here Reduce the friction that occurs between the winding mandrel and the wire Iu, the wire is usually before winding on the mandrel with a lubricant, e.g. drilling water. Often, however, the frictional heat is like that

Stw .: spiral head-crank thorn conical-cylindrical Womako file 668 - Nürtingen, Nov. 13, 1980

great that the lubricant evaporates immediately and as a result of the great friction that now prevails, the wire on his Surface is damaged.

Another problem is that the coiled wire screw is out of alignment with the conical mandrel runs to the winding mandrel axis. As a result of the contraction of the wire when it comes free from the winding mandrel, the Wire screw from the winding mandrel at an angle to the winding mandrel axis. The drainage angle is for different Wire screws of different sizes. This creates adjustment problems when the wire screw is immediately after it has been formed should be screwed into the holes of a pack of leaves. After a format change, the molding device must each time readjusted, which usually requires several attempts before the suitable adjustment is found. which ensures that the wire screw runs smoothly into the holes in the pack of leaves.

The invention has for its object to design a device of the type mentioned in such a way that on the one hand the friction between the wire and the mandrel is reduced, and on the other hand the wound wire screw runs in a defined direction from the winding mandrel. This object is achieved according to the invention in that the winding mandrel in the area of the wire inlet is frustoconical widening section and then, towards the wire drain, a cylindrical one Has section.

Surprisingly, and at the rate of the fee to the previous one Opinion, it has been found that it is not necessary to make an accurate wire screw,

t I I I

I t

p Stw .: spiral head mandrel conical-cylindrical

g Womako file 668 - Nürtingen, Nov. 13, 1980

a relatively long ko-ύ over the entire winding area niche-shaped winding mandrel to be used. Much is enough; more if the winding mandrel is conically shaped in the entry area

is formed, the conicity of the angular dimension must be greater than that of the known thorns, the wire but is treated much more gently because

J the corresponding (frustoconical) area only briefly,

e.g. according to the distance of two to three turns

ρ of the wire screw, needs to be. The adjoining

The cylindrical section of the winding mandrel creates a sufficient force-locking connection between the winding

mandrel and wire so that the wire screw is also securely formed. In addition, the cylindrical area causes

H of the winding mandrel and this is essential to the invention - a

, “The wound wire screw runs off in alignment with the winding

thorn axis.

According to a further feature, the effective area is the frustoconical section of the winding mandrel shorter than the cylindrical section. The non-positive connection between the mandrel and the wire can thereby be favored that the cylindrical portion has a non-slip surface. Damage of the wire through the non-slip surface is avoided according to a further characteristic that the surface of the cylindrical portion is provided with longitudinal grooves. Because on the cylindrical Section of the winding mandrel a relative movement between the wire and the winding mandrel only in the direction the longitudinal axis of the winding mandrel takes place, the wire is running in the longitudinal direction of the winding mandrel Grooves on its surface not damaged. Providing the surface of the cylindrical portion of the winding

Stw .: spiral head mandrel conical-cylindrical Womako file 668 - Nürtingen, Nov. 13, 1980

domes with a non-slip surface enables the use of a relatively short winding mandrel. A short one The winding mandrel in turn results in less heating of the wire.

It has already been mentioned that when the wire runs off the The winding mandrel contracts again a little. The running of the wire screw from the winding mandrel in a defined direction can according to a further embodiment of the invention can be made even more secure if the winding mandrel then adjoins the cylindrical section Has the end tapering portion. This section guides the wire screw even if the Wire has already contracted again.

β 1 ·

• · · t

Stw .: spiral head mandrel conical-cylindrical Womako file 668 - Niirtingen, Nov. 13, 1980

The invention is explained in more detail with reference to exemplary embodiments shown in the drawing. Show it:

Figure 1 is an end view of a device

for winding wire screws, Figure 2 is a sectional view of the device along line II-II

in Figure 1,
Figure 3 shows a variant of the device in Figure 1 in

a section, FIG. 4 a section of the device according to FIG with a differently shaped mandrel.

• ·

I ·

• ·

Stw .: spiral head mandrel conical-cylindrical Womako file 668 - NUrtingen, November 13, 1980

According to Figures 1 and 2, the device has a winding mandrel 1, which is rotatably mounted in a housing 2 by means of ball bearings 3 (only one ball bearing is shown) and can be driven in a known manner in the direction of arrow 4. In the winding area, the winding mandrel 1 has in the area of the wire inlet X is frustoconical widening section A and then, towards the wire drain Y, a cylindrical section B. The area of section A of winding mandrel 1 that is effective for the winding process is shorter than section B. Im In section B, the surface 6 of the winding mandrel 1 is made easy to grip by means of grooves 7 running in the longitudinal direction.

To the winding mandrel 1 around three holders 8 are arranged at the same distance from one another, which are on the end face of the housing 2 are fastened so that they can be adjusted radially to the winding mandrel 1. For each holder are in the front side of the housing 2, two pins 9 are let into a groove Ii of each holder 8. Are attached the holders 8 on the housing 2 by one each an elongated hole 12 in the holder 8 guided screw 13. In each holder 8, six cylindrical pins 16 are rotatably mounted in bores 14. In the axial direction the pins 16 are screwed into the bores 14 Stud bolts 17 secured, with which an exact adjustment of the pins 16 to the winding mandrel 1 is possible. Spacer pieces 18 of different thicknesses are inserted between two of the holders 8 and the end face of the housing 2, so that the rows of pins 16 to each other according to the pitch of the wire screw W to be wound are staggered. From Figure 1 it can be seen that the longitudinal axes L of the pins 16 parallel to radii R of the winding mandrel 1 are arranged offset by about half the diameter of the pins 16.

-9 -

Stw .: spiral head mandrel conical-cylindrical Womako file 668 - Nürtingen, Nov. 13, 1980

The mode of operation of the device does not fundamentally differ from that of known devices, i.e. the wire runs onto the winding mandrel 1 in the area of the wire inlet X and becomes truncated in the area of the cone widening section A formed into a wire screw by rolling on the pins 16 and is made dimensionally stable by stretching. The cylindrical section B of the winding mandrel 1 provides the necessary Frictional connection between the wire and the winding mandrel 1, the wire on the winding mandrel in the area of the wire run-off Y can slip a little and thereby contract, so that it can straighten the winding mandrel 1, i.e. 1n direction the longitudinal axis of the winding mandrel 1 leaves.

In the embodiment of Figure 3 are parts that with those 1, are provided with the same reference numerals, increased by 100, and are not explained again. In contrast to the embodiment in FIG. 1, pins 116 ′ are in the holder 108 in this device used, which are conically shaped in a region adjoining the winding mandrel 101.

In the embodiment according to FIG. 4, parts which correspond to those in FIG. 2 are provided with the same reference numerals, increased by 200, and are not explained again. A winding mandrel 201 * differs from the winding mandrel from FIG. Z in that it adjoins the cylindrical section B and tapers towards the end of the winding mandrel 201 '.

Claims (5)

Womako GmbH Ma schinenkonstruktionen Schlosserstraße 15 D-7440 Nlirtingen, November 13, 1980 Stw .: Spiral head winding cores conical-cylindrical Womako file 668 P - fq nsprUche 1. Device for winding wire screws with a driven, a conically widening winding area having a winding mandrel and one corresponding to the slope The stationary guide formed by the turns of the wire screw to be wound, which guides the wire and the turns axially advances on the winding mandrel, characterized in that the winding mandrel (1, 201) in the area of the wire inlet (X) a frustoconical widening section (A) and then, towards the wire outlet (Y), a cylindrical section (B). 2. Apparatus according to claim 1, characterized in that the effective area of the frustoconical section (A) of the winding mandrel (1) is shorter than the cylindrical section (B). 3. Device according to claim 1 and / or 2, characterized in that that the cylindrical portion (B) has a non-slip surface (6, 206). 4. Apparatus according to claim 3, characterized in that the surface (6, 206) of the cylindrical portion (B) is provided with longitudinal grooves (7, 207). • ■ · · Stw .: spiral head-winding mandrel conical-cylindrical Womako file 668 - Nlirtingen, Nov. 13, 1980 5. Device according to one or more of the preceding claims, characterized in that then on the cylindrical section (B) of the winding mandrel (201) has a section (C) which tapers towards its end.