DE1254111B - Device for the production of springs polygonal, z. B. rectangular floor plan - Google Patents

Description

GERMAN ^ ftgTVW PATENT OFFICE

EDITORIAL

German class: 7 d - 2

Number: 1254111
File number: G 299291 b / 7 d

J 254 111 filing date: June 25, 1960

Opened on: November 16, 1967

The invention relates to a device for producing springs polygonal, e.g. B. more rectangular Ground plan, with mutually spaced turns, which are a pair periodically drivable wire feed rollers for pushing the wire into one at the end with one A guide provided with a bending edge, a bending finger that can be pivoted approximately around the edge and a has adjustable stop for bending the turns in the direction of incline.

In the mattress industry, it has proven advantageous in the manufacture of spring cores to to use for this in their plan design rectangular steel wire springs, the several in have mutually spaced turns. As in the manufacture of a spring core a larger number of such springs are connected to one another by wire screws (birid wire) must be, it is important to facilitate this connection that in their axial Top view of rectangular shaped springs of the four belonging to a complete spring coil Leg lengths two directly adjoining one another and forming an angle with one another Legs lie in a common plane perpendicular to the longitudinal axis of the spring, while the adjoining two legs each enclosing the opposite angle must have the same slope and therefore also lie in a common plane, which however relative to the plane of the aforementioned two legs inclined by the angle of inclination to the longitudinal axis of the spring runs. In the case of a spring of this type, which is rectangular in plan, it is followed by the fourth Leg a leg that forms the beginning of the next spring turn, that of the first leg the previous spring coil runs parallel and therefore just like the one adjoining it next leg has no slope with respect to the longitudinal axis of the spring. Feathers of this type have different leg lengths and different leg slopes. You can therefore with the winding process that has been customary since then, in which the wire on a Winding core is wound with a constant slope relative to the core axis.

Springs with very different pitch angles within a spring turn can only be produced with such winding machines with great difficulty because the wire does not have a sufficient guide device for producing springs during the winding process in the axial direction at the bending contacts of the core
polygonal, e.g. B. more rectangular
Floor plan design

Applicant:

Thank God Gussmann,
South German bed cushion factory,
Pleidelsheim / Neckar

Named as inventor:

Walter Lehmann, Pleidelsheim / Neckar

tion receives and slips along these turning edges when the guide device receiving the wire in the longitudinal direction of the spring before it reaches the bending edge by the amount required for larger angles of incline.

In addition, such springs generated by winding on a core would after completion of the The winding process jump against the winding direction and its predetermined by the core lose polygonal floor plan design in a relaxed state.

There are already working according to the known principle of coil spring coiling machines became known for the production of springs with coils running at a mutual distance, in which the windings have a plan design deviating from the circular shape. These known devices have a pair of periodically drivable wire feed rollers for inserting the wire into a guide on which the wire is moving during its feed movement bent out of the feed direction and then bent out of the bending plane achieved in this way runs up against an adjustable stop in the direction of incline. With such devices can however, only spring coils are produced which have a constant within one and the same coil Have angle of incline. These known devices also allow production of springs with a polygonal plan design,

709 688/42

when the winding tool is periodically stronger and weaker than that of the feeding device leaving wire is served. The turning zones between the individual polygon legs However, due to the winding principle used, they can only be designed with relatively large radii be, so that within a turn to a rectilinear polygon leg a curved piece of wire is connected, the wire length of which is also bent in the direction of incline will.

There are also already working in the manner of a folding bench devices for producing square ones Helical seam tubes have become known, in which the metal strip to be processed is the bending edge runs under an inclination which determines the helix pitch and for the production of the individual Polygon legs each so far beyond the bending edge under a swiveling bending finger is advanced that the advanced piece of tape is bent while pivoting the bending finger can be. Because the helical seam tubes lie close to one another with their successive turns should, the individual polygon legs of a turn each have the same slope opposite the pipe axis. With these known bending machines for helical seam tubes can therefore no helical springs are generated, which in itself with different lengths of the polygon legs have different leg slopes within one turn.

The invention is based on the object of creating a device of the type mentioned at the beginning, with the feather polygonal plan design with different leg lengths within one turn and various leg pitches can be produced precisely and in series.

This object is achieved according to the invention by a control of the pair of rollers, through the train the manufacturing process of the same spring corresponding to different spring leg lengths Wire lengths can be advanced, in conjunction with several stops arranged below the guide as well as one on the side facing in the direction of incline of the spring opposite the largest Leg length larger bending finger located stop edge for the wire, which the different Slits corresponding to leg lengths for the passage of spring legs lying in the direction of incline having.

The combination of these features is made possible in an advantageous manner between the individual Legs of different lengths to achieve bending zones with very small bending radii and at these Turning zones to achieve the desired angle of incline the following To twist the leg section laterally out of the bending plane of the previous leg.

The setting of the respectively desired pitch angle can be accomplished in a simple manner, if, in a further embodiment of the invention, the stops can be displaced parallel to the wire axis and have a deflecting nose for the legs to be bent at the front.

If an adjustable pivot stroke is provided for the bending finger in a known manner, this results a particularly simple and effective arrangement, if according to a further feature in the framework

Men of the invention of the bending finger can be driven by a crank mechanism, the connecting rod bearing in a Radial groove of the crank disk is kept adjustable.

In the drawing, an embodiment of the subject matter of the invention is shown schematically. It shows

F i g. 1 is a side view of the feeding and bending device,

F i g. 2 the turning maneuver for a short

Leg of wire spring,

F i g. 3 shows a section along line III-III of FIG. 2, fig. 4 the turning of a long leg of the

Feather,

F i g. 5 shows a section along line VV of FIG. 4, fig. 6 the drive of the bending finger.
The steel wire 6 is advanced through a pair of rollers 1. The drive of the pair of rollers 1 is controlled so that the feed corresponds to the respective desired leg length. When the wire is advanced, it is guided through the straight guide 2 under the bending finger 3. The bending finger 3 executes a rotary movement running approximately at a right angle, the wire resting on the stop edge 3c of the bending finger 3 being bent around the bending edge 7. The stop edge 3 c has slots 3 a, 3 b corresponding to the different leg lengths for the passage of spring legs lying in the direction of incline. The wire 6 drawn in by the pair of rollers is advanced either to the slot 3 a or to the slot 3 b according to the intended length of the wire legs. In Fig. 2 shows a bent short leg. It can be seen that the preceding leg runs up against the stop 4, which bending forward gives it a corresponding slope which can be increased or decreased by adjusting the stop 4 parallel to the wire axis. In Fig. 4, a long leg is bent around the bending edge 7, the previous leg runs onto the stop 5 and thereby receives a slope corresponding to the position of this stop 5. The stop 5 can also be displaced parallel to the wire axis to change the slope. The stops 4 and 5 have deflector lugs Λα, 5 a on the front side, on which the legs of the spring slide along.

The stop 4 can be set back so far that the legs running onto it do not Get slope. Due to the elasticity of the wire, the leg springs after the slight pre-bending back to the old position, so that only the legs running against the stop 5 with a Slope can be provided. In this way, a spring is obtained, each with transverse and ascending legs has within a turn. The transverse legs of neighboring springs of a spring kerties can be connected by a wire screw.

From Fig. 6 it can be seen that the bending finger 3 is driven by the crank disk A via the crank B and the lever C. By adjusting the connecting rod bearing D in the radial groove E of the crank disk A , the path of the bending finger 3 is increased or decreased and the wire is thereby bent to a greater or lesser extent. The fulcrum of the bending finger 3 lies in the bending edge 7. The stops 4 and S are displaced by means of adjusting screws in their elongated hole and clamped with a screw.

Claims (3)

Patent claims: 1. Device for the production of springs polygonal, z. B. rectangular plan design, with mutually spaced turns that have a pair of periodically drivable wire feed rollers for inserting the wire into a guide provided at the end with a bending edge, a flexible finger that can be pivoted about the edge and an adjustable stop for bending the turns into the Has the direction of incline, characterized by a control of the roller pair (1), by means of which wire lengths corresponding to different spring leg lengths can be advanced in the course of the production process of the same spring, in connection with several stops (4, 5) arranged below the guide and one on the in the direction of incline of the spring facing side of the bending finger (3) , which is larger than the largest leg length, Striking edge (3 c) for the wire (6), which has slots (3 a, 3 b) corresponding to the different leg lengths for the passage of spring legs which are laid in the direction of incline. 2. Device according to claim 1, characterized in that the stops (4, 5) are displaceable parallel to the wire axis and have a deflector nose (4 a, Sa) for the leg to be bent on the front side. 3. Device according to claim 1 with a bending finger whose pivoting stroke is adjustable, characterized in that the bending finger (3) can be driven by a crank mechanism (A, B, C) , the connecting rod bearing (D) in a radial groove (E) of the crank disk (A) is kept adjustable. Considered publications:
German Patent No. 58,986;
British Patent Nos. 577 563, 667 632;
U.S. Patent No. 1,349,079,
420,2339,219. 1 sheet of drawings 709 688/42 11.67 © Bundesdruckerei Berlin