DE1752683C - Device for bending helical rings made of wire - Google Patents

Description

1 2

The invention relates to a device that even with a certain amount of play in the jump ring

for bending helical rings made of wire with the jump ring in its bearing during bending

one helically around the axis of a mandrel does not touch the mandrel and thus jamming

twisting bending guide and with at least one safety can be avoided.

on the side facing away from its bending guide on support S To prevent wear on the bearing of the support rollers

roll rotatably mounted round bending body, which should be reduced as possible for the jump ring, according to

the wire on the outside of the bending guide leads to a further embodiment provided that for

and thereby bends. Store the support rollers for the jump ring a coaxially

With this generic term, the invention takes on the running ring arranged for the jump ring

a prior art reference, as it is in Germany, made from a material suitable for this purpose

see patent specification 947 064 is described. There are exist.

several rollers serving as bending bodies are provided. The device according to the invention can be The side facing away from the bending guide can be expanded very easily by following additional Merk support rollers with axes parallel to the mandrel axis paint in the context of the invention the mandrel in a are rotatably mounted. 15 hole of a base plate is used, the one

When the wire is deformed, the cover plate carries the one to the base plate bore Occurring, very high forces only from four small concentric holes and one after this hole Bending rollers and five large support rollers are accommodated and have an annular groove that is open towards the base plate, men, whereby the transmission of the bending force is essential in that of the raceway, the support rollers and the bending elements only takes place by line contact, so ao ring are arranged. Here can in the Grunddaß a very high surface loading occurs, the plate has a recess for guide surfaces for the wire-forming inserts can be provided for relatively rapid wear of the rollers leads. where the wire rests, as far as it touches the jump ring

In another known device they are not affected. These insert pieces can consist of a

Bending rollers can be made with a suitable wear-resistant material that is oriented radially to the mandrel axis.

Axes arranged so that the end faces of the They also have the advantage that they are easily dis-

Rolls serve as bending surfaces. Here, too, can be switched with.

a high level of wear is to be expected. In addition, the invention is based on a

that the wire to be inserted in this known embodiment shown in the drawing

Device must be sharpened, otherwise its end 30 is explained. It shows

get caught on an edge of the roller end faces F i g. 1 a side view of the device,

can. * Fig.2 shows a partially broken away

The invention is therefore the task of- plan view,

reasons, a device for bending helical F i g. 3 shows a section along the line IH-III in

To create rings from wire, in which the wear 35 Fig.2.

of the round bending body to a minimum. 4 shows a section along the line IV-IV in FIG

is limited, even without the sharpening of Fig. 1,

Wire ensures perfect function Fig. 5 is a view of an insert in the direction

should be. direction of the arrow V in FIG. 1.

This object is, according to the invention, thereby 40 The device for bending a helical

solved that as a bending body the mandrel konzen- ring 1 from a trapezoidal cross-section

trically comprehensive jump ring is provided, the wire 2 has a mandrel 3, which is in a BoIi-

Inner surface forms the outer wall of the bending guide. tion 4 of a base plate 5 is used, the one

As a result, cover plate 6 is carried in a surprisingly simple manner, which reaches with a base plate that the wire when bending through the 45 bore 4 concentric bore 7 and one for Bending ring with its entire outer surface on the bending dome 3 and the annular groove 8 open towards the base plate 5 ring rests, so that it is relatively by mistake when bending. The mandrel 3 protrudes with its upper one small surface pressures occur. Since the end of the hole ?. His flat upper forehead If the jump ring rotates during bending, the surface parts of the jump ring with the highest load on the surface are flush with the upper surface of the cover plate at 5 »plate 6. In the one by the cover plate 6 on the one hand each new insertion of a wire offset, so that and the mandrel 3 on the other hand formed annulus the load that occurs as a result is an outer raceway 9 within the annular groove 8 the time over the entire inner groove of the bending for support rollers U and one by means of these support rollers ring distributed and thereby the wear of the ring on its outer sleeve supported jump ring 12 is kept to a minimum. 55 arranged, the mandrel 3 facing inner

In an embodiment of the invention it is provided that the outer wall of a bending guide for the surface

that the inner surface of the jump ring forms with an um-wire 2. Inside the base plate S is a

A catch groove in the outer surface of the mandrel provides a feed channel 13 for the wire 2, which in

Forms bending channel representing bending guidance. a helical circumferential groove 14 in the

This results in proper guidance of the mandrel 3 which ends together with the inner surface

Wire guaranteed. It is advantageous here for the bending ring 12 to represent the bending guide

According to a further feature, within the framework of the earth, the bending channel for the wire 2 is formed. In the area

Finding between the mandrel and the bending ring of the circumferential groove 14 is the outer diameter of the

to provide an annular gap, the mandrel 3 slightly smaller than the inner diameter of the

z. B. can be achieved in that the dome 65 bending ring 12 so that between this and the

in the area provided with the groove there is a somewhat mandrel 3 an annular gap,

has a smaller diameter than the diameter ensures that even with a certain play of the

knife of the low. This ensures that the bending ring 12 is within its by the support rollers

Ii bearing a clamping formed is excluded the bending ring 12 on the mandrel 3

To the wire 2 within the base plate 5 properly to be able to lead is a recess 15 for FiihrungsHädien for the base plate Wire-forming inserts 16 to 19 are provided. Here, 13 are two to form the feed channel Guide pieces 16 and 17 are provided. Because the wire is in front of the bending channel when bending. the entry into the Bending channel is pressed outwards, is to support its outer surface at this point Side steel 18 provided. The end of the side steel 18 facing the wire 2 has a shoulder 20 (Fig. 5), the two walls of which form a lateral and a lower guide surface for the wire. There the bending ring 12 must not exceed a certain width, the bending channel is initially in its lower area from the outside through a segment piece also inserted into the recess 15 19 limited, which forms a run-up surface for the wire 2 ao. The insert pieces 16, 17, 18 and 19 exist made of a hard metal and are interchangeably clamped in the recess 15.

In order to prevent the remaining parts of the device from being worn by the moving parts - i. H. through as the jump ring 12 and the support rollers 11 - to protect, are on both sides of these parts are also about the race 9 extending wear rings 21 and 22 are provided.

An axial groove 23 is provided in the mandrel 3, in which a cutting steel 24 is guided in an axially displaceable manner, which cooperates with a counter knife 25 which is fastened to the cover plate 6. The contradiction 25 is arranged in such a way that it is on the upper outer surface of the bending ring, which is perpendicular to the mandrel axis 12 rests and its cutting edge extends transversely to the exit end of the bending channel. The who The part of the side steel 18 forming the lower guide surface extends as far as the cutting steel 24.

To bend the wire 2, it is inserted into the feed channel 13. As soon as the end of the Wire enters the Bicgekanal formed by the groove 14 and the inner surface of the bending ring 12, its front end touches the jump ring 12 and the segment piece 19 at the same time Insertion of the wire 2 is now .ein front end first through the plant on these two Divide and later through the system only on the jump ring 12 in a helical shape in the bending channel bent into it, with the part of the wire immediately in front of the entry into the Bicgekanal the adjacent guide surface of the Seirenstuhl 18 is printed. Once a long enough piece of the wire is bent into a helical ring 1, the cutting steel 24 is axially upward moved, so that the helical ring 1 is then sheared off by the cutting steel 24 and into the counter knife 25 will.

Claims (8)

Patent claims: I. Device for bending helical shapes Hinge made of wire with a spiral guide that winds around the axis of a dome and rotatable on support rollers with at least one side facing away from the bending guide mounted round bending body that guides the wire on the outside of the bending guide and thereby bends, characterized in that the mandrel (3) is concentric as the bending body comprehensive jump ring (12) is provided, the inner surface of which is the outer wall of the Bending guide forms. 2. Apparatus according to claim 1, characterized in that the inner surface of the bending ring (12) with a circumferential groove (14) in the outer surface of the dome (3) a bending guide forming bending channel forms. 3. Apparatus according to claim I or 2, characterized in that between the mandrel (3) and the jump ring (12) an annular gap (10) is present 4. Device according to one of claims 1 to 3, characterized in that for storage of the support rollers (11) for the bending ring (12) is a running ring arranged coaxially with the bending ring (12) (9) is provided. 5. Device according to one of claims 1 to 4, characterized in that at least one end face of the bending ring (12) which extends at least also over the support rollers (11) Wear ring. (21; 22) is provided 6 Device according to one of Claims 1 to 5, characterized in that the dome (3) is inserted in a bore (4) of a base plate (5) which carries a cover plate (6) which has a to the base plate bore (4) concentric bore (7) and one to the mandrel (3) and to the base plate (5) has an open annular groove (8) in which the race (9), the support rollers (11) and the Jump ring (12) are arranged. 7. Apparatus according to claim 6, characterized in that in the base plate (5) a Recess (15) for insert pieces (l6, 17,18,19) is provided to form the guide surfaces for the wire (2). 8. Apparatus according to claim 7, characterized in that that as separate pieces two guide pieces (16, 17) forming a feed channel (13) for the wire (2), a segment piece (W) and between these a side steel (18) are provided, which continues an ilen feed channel (13), Forms lateral and lower guide surface for the wire (2). ⁽ ). Device according to one of Claims 1 to 8, characterized in that an axial groove (15) is provided in the mandrel (3) in which a cutting steel (24) is displaceably guided, which cooperates with a counter knife (25) which is attached to the The mandrel axis rests on the vertical outer surface of the bending ring (12) and at the exit end of the bending guide. K). Device according to Claim ¹ , characterized in that the Ciegen knife (25) is attached to the cover plate (6). For this purpose i sheet of drawings