DE3240341A1 - Device for bending a moving wire into a loop - Google Patents

Abstract

The invention relates to the production of a wire comb (DK) as required for the production of wire bindings of blocks of paper. Two supports (8a, 8b) which rotate alternately in steps about parallel axes (2a, 2b) and have bending mandrels (Ia...IVa, Ib...IVb) are arranged opposite one another and offset relative to one another. Between them, the supports (8a, 8b) define a guide channel (K) for the wire (D). To bend the wire, the bending mandrels are pushed forward in succession, with the result that they project into the guide channel and take the wire along, bending it in the process, and are drawn back again after bending. <IMAGE>

Description

Stw. Produce wire comb binding-BiegekammermII

Device for loop-shaped bending of a continuous wire The invention relates to a device for loop-shaped bending of a continuous Wire, in particular for producing a wire comb, the prongs of which are hairpin-shaped curved, closely spaced wire sections are made through in the longitudinal direction the wire comb running, one behind the other wire sections connected are.

Wire combs of the aforementioned type are used to bind blocks, by the wire combs c-shaped vorgebom gene, divided into wire comb sections, in the holes made in the blocks in the area of a side edge and to be closed0 There are several types of devices for making wire combs of the aforementioned type is known. In one type, the wire is wound by means of a winding tool wrapped around two rows of pins, indicating the spacing of the pins of the two rows is enlarged to each other. As a result, the wire is stretched so that he the Assumes the desired shape, that is, fits tightly to the pins, and by stretching beyond its elastic limit is fixed in this anschter form0 As Examples of such devices are shown in U.S. Patents 3,691,808; 3,805,579, 4th 047 544 and 4 165 768. With these devices it can happen that the wire breaks at higher operating speeds in another type of device the wire is made by means of rotating, interlocking forming tools Stw. Establish wire comb binding-Bending chamber -If pre-formed and through downstream, Circumferential tools provided with grooves are brought into their final shape.

For an example of such devices, see U.S. Patents 3,046,694 and 3,670,781. These devices also make the wire strong loaded, in particular by the downstream forming tool of the wire a is exposed to strong friction, which is a disadvantage in the case of surface-treated wires is.

There are also devices in which the wire is wound again using winding tools is wrapped around two rows of pins, whereupon there are pliers in the area of the pins shape the wire around the pins and bring it into the desired shape. As an an example See U.S. Patents 2,047,771 and 3,556,166 for such devices. These devices are limited in their performance.

It has also been proposed according to DE-OS 2 148 915, pins to bend the wire on the chain pins of a chain and the chain links fold while the chain goes around. But this device must have a further device for the final shaping of the wire can be arranged downstream. For this are known in the DE-OS molding tools such. B. snails suggested. As already explained in the penultimate section, the wire is used in such forming tools but heavily stressed by friction, i.e.

its surface can be damaged.

The invention is based on the object of a powerful and to create the wire gently treating device of the type mentioned.

This object is achieved according to the invention in that two to Axes rotatable carrier, on their facing end faces with the same distance to the axis of rotation Stw .: create wire comb binding-bending chamber-I des respective carrier and arranged with the same distance from each other bending mandrels are arranged eccentrically and axially spaced from one another in such a way that they partially overlap and delimit a guide channel for bending the wire, that the two carriers alternate successively in opposite directions are stepwise drivable, and that means for removing the wire loops from the mandrels are provided.

The advantage of the specified device is that the wire only by one-time 9 consecutive bending steps into the desired Is brought into shape. The wire is neither stretched nor is it stretched to stabilize its shape it is stressed by rubbing molds. Because the mandrels also form and bending tools, the device can be built relatively simply and compactly, what a very high cycle rate and thus a correspondingly high performance of the device guaranteed. The axes of the two carriers are expediently parallel, see above that an optimal guide channel for the wire is formed by, according to a further Feature the facing end faces of the carrier at least in the Bending mandrels delimited areas are plane-parallel in the known, with shaped pins Working devices must have the wire from the winding tool having a bending mandrel are removed by means of wipers. Such wipers are in the inventive Device not necessary if, as provided in a further embodiment, the bending mandrels are movably mounted on the supports, and if control means for the mandrels are provided that the Stw .: create wire comb binding-bending chamber-II Bending mandrels after bending the wire from a working position in which they protrude into the guide channel, move out of the guide channel and they, before bending the wire again, move it back to the working position. According to a further embodiment, the wire can be bent true to shape be supported that controllable holding means interacting with the bending mandrels are provided that the wire in each subsequent downtime after a bending step hold on to the respective bending mandrel. As a holding means around to the axes of the Carrier parallel axes pivotable levers proposed. For trouble-free conveying of the bent wire protrude into the guide channel according to a further feature bent wire conductive, fixed guides into it, so that the wire after the Removal of the bending mandrels is guided on all sides. To those to be accelerated and to keep the decelerating masses as small as possible is a matter of course for every carrier separate indexing gear assigned. Not only are indexing gear here mechanical, a continuous drive movement into an intermittent output movement changing gears but also electric stepper motors or electrically controlled ones Understand hydraulic motors. The holding means can consist of continuously revolving control cams be operated. The mandrels are expediently parallel to the axes of the Carrier mounted displaceably in this. With such a storage of the mandrels these can be actuated by means of stationary control cams.

By gradually bending the wire one after the other this is set in vibration in the area of its feed. To control this, is according to a Stw .: create wire comb binding-bending chamber-I1 further characteristics upstream of the guide channel a wire guide, which in a level aligned with the guide channel corresponding to that caused by the bending mandrel Movement of the wire is controllable0 The wire to be processed is usually Taken from a rolled supply of wire9 so that the wire is straightened before bending It is therefore advisable to use the wire guide as a wire straightening device educated.

Such a wire device can consist of two groups of the wire each exist between leading roles, with the groups one behind the other and in are arranged perpendicular to each other0 Safe guidance of the wire is achieved when the axes of the group of rollers facing the guide channel are perpendicular run to the guide channel0 The group facing the guide channel can roll be stored on a common holder that is perpendicular to the guide channel standing axis is pivotable.

S @@ .: Drahtka: -connecting-Biegekaamer-II The invention becomes explained in more detail using an exemplary embodiment shown in the drawing.

They show: FIG. 1 a device for loop-shaped bending of a Wire in a perspective view, Figure 2 the left half of the device of Figure 1 in section, Figures 3a to 3h different working positions of Bending mandrels and holding means of the device in a schematic representation, FIG 4 a controlled wire guide arranged upstream of the device in FIG.

Stw. Establishing a wire comb binding-bending chamber-the one shown in FIG. 1 Device consists of two of the same or only slightly different from each other Components built in the same conception pen la and 1b, the such are arranged opposite one another, that their bending tools face one another and in the vertical direction corresponding to the length of the wire loops to be bent are offset0 The section shown in Figure 2 through the assembly 1a in Figure 1 initially runs horizontally through an axis 2a and 2, indicated by dash-dotted lines then perpendicularly through an axis 3aO indicated by dash-dotted lines. The cross-sectional shapes the bending tools in the form of mandrels Ia, IIa, lIIa, IVa and Ib, IIb, IIIb, IVb can be seen in FIGS. 3a to 3h, the bending mandrels painted in black are each in working positions9 in which they are in one between the assemblies 1a and 1b located guide channel K (see Figure 2) protrude, while only in their Bending mandrels shown on the outer contour moved out of the aforementioned working position are, d. H. do not protrude into the guide channel K.

The mandrels Pa. 0. IVa are hairpin-shaped in shape curved prongs (loops) Z connecting sections A of the wire comb to be bent DK and the bending mandrels Ib ... IVb adapted to the hairpin-shaped prongs Z.

The following description of the assembly 1a also applies to the assembly 1b9 where instead of the letter a supplementing the reference numbers, the letter b is to be set.

Parts that differ from one another in terms of shape are indicated separately. In order to maintain clarity, only some of the transmission elements are shown in FIG Shown like a phantom.

Stw .: Create a wire comb binding-Bending Chamber-I1 In one housing 4a, by means of ball bearings 6a, 7a, is a support 8a designed as a body of rotation stored, which is formed by screwed together rotating parts 9a and 1 la. At the rotating part 11a is a switching cross 12a with guide grooves 13a of a step gear 14a in the form of a known and therefore not shown and described in detail Geneva gear screwed. In sliding bushings inserted into the rotating parts 9a and 11a 16a or

17a are at the same distance from the axis of rotation 2a and the same distance four slides 18a arranged to one another.

This slide 18a are parallel to the axis of rotation 2a and displaceable carry the bending mandrels Ia resp. IIa or IIIa or IVa. On each slide 18a are a guide roller 19a and one Control roller 21a stored. The guide rollers 19a are worked into the rotating part 9a, guide grooves 22a running parallel to axis 2a and secure the slide 18a against twisting. The control rollers 21a roll on a control means in the form of a Fixed cam 23a, which is part of a bearing bore for receiving a carrier 8a in the housing 4a closing, screwed to this cover 24a is.

The control rollers 21a of the slide 18a are in bores 26a the slide 18a embedded compression springs 27a, which are embedded in the switch cross 12a Support abutments 28a, pressed against the control cam 23a. The carrier 8a has a cover 29a with a flat end face Fa and openings 31a for the bending mandrels Ia ... IVa on.

The guide channel K is thus made up of the plane-parallel end faces Fa and Fb are bounded by covers 29a and 29b of supports 8a and 8b, respectively.

Stw .: Create wire comb binding-Bending chamber-II In the housing 4a resp. in one to this; Flanged bushing 30a is a by means of ball bearings 32a 33a drivable by a drive, not shown, to form a uniform rotary motion Shaft 34a mounted9 the one of the stepping gear 14a belonging9 two-armed Has shift lever 36a, on which in the guide grooves 13a of the crossbar 12a engaging pulleys 37a are mounted0 38a denotes a locking cam9 those with corresponding? not shown locking curve sections on the switch cross 12a cooperates and this fixes9 when none of the pulleys 37a with one of the Guide grooves 13a is engaged (appear through the angled section the axes of rotation 2a and 3a and the parts revolving around them in FIG. 2 are not in their actual assignment but with a larger distance). The carriers 8a and 8b can also from electric stepper motors or electrically controlled hydraulic motors are driven to successive rotary movements of 900 each. On the Shaft 34a is a control cam 39a by means of a clamping ring screwed onto the latter 40a attached. The control cam 39a actuates a holding means in the form of a lever 41a, which protrudes into the guide channel K (see Figure 1). The lever 41a is on a shaft 42a mounted at one end in the housing 4a clamped to the other At the end of the shaft 42a, a lever 43a is clamped, one of which is on the control cam 39a unrolling control roller 44a carries the latter to the former by one on the lever 43a acting 9 on a bracket 46a attached to the housing 4a supported compression spring 47a is pressed. To cover the last-mentioned parts, refer to the relevant Side of the housing 4a a cover 48a is screwed.

The lever 41a points at its into the guide channel K Stw. Establish a wire comb binding-the bending chamber-Il protruding end a retaining hook 48, whereas the lever 41b has only one holding surface 49 at the relevant end.

The wire comb DK, conductive, stationary, protrude into the guide channel K Guides in the form of rails 45, 50 into it.

The two assemblies 1a and 1b are arranged in relation to one another in this way or integrated into a machine processing the wire comb DK that the axes of rotation 2a, 3a and 2b, 3b run parallel to each other and the axes of rotation 2a and 2b one on the size of the wire comb DK to be bent or on the length of the prongs Z dependent have perpendicular to the discharge direction lying distance, that is, the Carriers 8a and 8b are accordingly arranged eccentrically to one another.

The wire guide 51 according to FIG. 4 is arranged upstream of the assemblies 1 a and 1 b. This is designed as a wire straightening device and consists of two, one behind the other arranged groups 52, 53 of the wire D to be bent leading between them Rollers 54 each having a guide groove 56 in their peripheral surfaces. the Groups 52, 53 are arranged in mutually perpendicular planes, with axes 57 of the rollers 54 of the guide channel K between the assemblies la and Ib (FIG 1) facing group 53 run perpendicular to the guide channel K.

The rollers 54 of group 52 are on one on a machine frame 58 mounted bracket 59 mounted. The rollers 54 of the group 53 are on a common Mounted holder in the form of a plate 61, which is about an axis 62 on the machine frame 58 is pivotably mounted. One at the Stw .: wire comb binding manufacture-bending chamber-I plate 61 mounted control roller 63 acts with a steady revolving control cam 64, which are designed in this way or to the shafts 34a and 34b of assemblies 1a and

1b can be driven in such a way that with one revolution of the shafts 34a and 34b the plate 61 is pivoted up and down twice, i.e. the group 53 of rollers 54 makes the movement of the wire D mit9 the same as in FIGS. 3a to 3h the mandrels Ia ... IVa and Ib ... IVb are imposed.

Operation of the device: The indexing gears 14a and (14b) are so connected to a common drive that they the carrier 8a and 8b in drive in opposite directions and out of phase5 d. h0 during a When the carrier 8a is idle, the carrier 8b performs a rotational movement of 900 im Clockwise, and during a standstill period of the carrier 8b, the carrier leads 8a a rotation before 30 ° counterclockwise from 0 'counting down the rotation steps the carrier 8a and 8b roll the control rollers 21a and (21b) on the control cams 23a or (23b) and move the slide 18a or 18b.

As a result, the mandrels arranged on the slides 18a and 18b are arranged Ia ... IVa or 1b00 IVb successively for bending the wire D into the guide channel K is moved in and out again after bending. Each in the Guide channel K protruding mandrels Ia ... IVa and Ib ... IVb are in the figures 3a ...

3h, as already stated, blackened out. Via the control cams 39a, 39b, the levers 41a and 41b are moved up and down in such a way that they are in the from the figures 3a ... 3h apparent type with their holding hooks 48 or

their holding surface 49 with the bending mandrels Ib ... IVb or

Ia ... IVa cooperate. As already explained, Stw .: Wire comb binding produce-Biegekanuner-Il follows the group 53 of rollers 54 of the Wire guide 51 controlled the up and down movement caused by the bending mandrel of the wire D.

Figure 3a shows the position of the mandrels Ia ... IVa, Ib ... IVb and the lever 41a, 41b immediately before the carrier 8a begins to rotate. The lever 41b has been pivoted downwards so that its holding surface 49 is no longer the wire section A presses against the bending mandrel IIa. In the previous bending step of the bending mandrel IIb, the wire D has been brought into contact with the bending mandrel Ia. The wire D is held on the bending mandrel IIb by the lever 41a with its holding hook 48. (The rollers 54 of the wire guide 51 provide the tensile stress necessary for the bending in wire D).

FIG. 3b shows the beginning of the bending process through the bending mandrel Ia. It can also be seen that the bending mandrel IIa with the start of the rotary movement of the carrier 8a has been withdrawn from its working position.

Figure 3c shows the end of the rotational movement of the carrier 8a, in which the Bending mandrel Ia the wire D to a hairpin-shaped prong Z around the bending mandrel IIb has bent. The lever 41b is pivoted upwards so that its holding surface 49 presses the wire D against the bending mandrel Ia.

Figure 3d shows the beginning of a subsequent rotary movement of the carrier 8b. The lever 41a is pivoted upwards, so that its retaining hook 48 the way for the movement of the bending mandrel IIb releases. The bending mandrel IIb initially remains in his working position, so that he according to Figure 3c Stw .: wire comb binding manufacture-bending chamber-Il last formed and slightly inclined wire prongs Z bent straight.

In Figure 3e, the work process described last has just been reached, the lever 41a is pivoted downwards again, and the bending mandrel Tb has with the wire D get in touch.

FIG. 3f shows the subsequent state9 in which the bending mandrel IIb after straightening the last bent prong Z withdrawn from its working position is.

Figure 3g shows the device shortly before the end of the considered Bending step of the carrier 8b9 and Figure 3h shows the end of the rotary movement of the Carrier 8b The bending mandrel Ib presses the wire D against the holding hook 48 of the lever 41a, the wire D is in contact with the bending mandrel IVa, and a new section A of the wire comb DK is formed. From the figures 3c2 3d and 3h it can be seen that the wire D initially over-arched, doho is arched more than is necessary according to its desired shape appears. Due to its elasticity, the wire bounces after being released back a little at the bending points. There is no need to overbend the wire Otherwise usual stretching of the wire over the bending mandrel or post-forming with a additional equipment9 to get the final shape of the wire comb.

The successive bending steps of the mandrels Ta, Ib, IVa, IVb, IIIa9 IIIb, IIa9 IIb, etc., promote the formed wire comb DK from the guide channel K addition, being guided by the stationary rails 45 and 50 and thereby is kept quiet0 L e r s e i t e

Claims (16)

Stw .: Wire comb binding to produce-Bieekammer-IT patent claims device for loop-shaped bending of a continuous wire, in particular for manufacturing a wire comb, the prongs of which are made of hairpin-shaped bent 9 close together There are wire sections, which run in the longitudinal direction of the wire comb, the arranged wire sections are connected one behind the other, characterized in that that two supports (8a, 8b) rotatable about axes (2a9 2b) on their facing one another Front sides (Fa, Fb) with the same distance from the axis of rotation of the respective carrier and with the same distance from each other bending mandrels (Ia .. IVa, Ib ... IVb) arranged are arranged eccentrically and axially spaced from one another in such a way that they partially overlap and a guide channel (K) for bending the wire (D) limit that the two carriers alternate successively in opposite directions Directions are incrementally drivable, and that means for removing the wire loops (Z) are provided by the bending mandrels. 2. Apparatus according to claim 1, characterized in that the axes (2a, 2b) of the two carriers (8a, 8b) run parallel. 3. Device according to claim 1 and / or 2, characterized in that that the facing end faces (Fa, Fb) of the carrier (8a, 8b) at least plane-parallel in the areas delimited by the bending mandrels (Ia ... IVa, Ibö .. IVb) are. Stw .: create wire comb binding-bending chamber-I; 4. Device according to one or more of the preceding claims, characterized in that the Bending mandrels (Ia ... IVa, Ib ... IVb) are movably mounted on the supports (8a, 8b), and that control means (23a) are provided for the bending mandrels which the bending mandrels after bending the wire (D) from a working position in which it is in the guide channel (K) protrude into it, move it out of the guide channel and before bending the wire again, move it back to the working position. 5. Device according to one or more of the preceding claims, characterized in that controllable, with the bending mandrels (Ia ... IVa, Ib ... IVb) cooperating retaining means (41a, 41b) are provided which hold the wire in each After a bending step, hold the following downtime on the respective bending mandrel. 6. Apparatus according to claim 5, characterized in that the holding means than about axes (42a, 42b) which are parallel to the axes (2a, 2b) of the carriers (8a, 8b) Levers (41a, 41b) are formed. 7. Apparatus according to claim 1, characterized in that in the Guide channel (K) the bent wire (wire comb DK) conductive, fixed guides (45, 50) protrude so that the wire after bending and removal from the bending mandrels (Ia ... IVa, Ib ... Ib) is guided on all sides. 8. The device according to claim 1, characterized in that each A separate index drive (14a, 14b) is assigned to the carrier (8a, 8b). St. Claim 5 and / or 6, characterized in that the holding means (41a, 41b) of continuously revolving control cams (39a, 39b) can be actuated. 10. The device according to claim 1, characterized in that the bending mandrels (ia .. IVa, Ib.0. IVb) parallel to the axes (2a, 2b) of the carriers (8a, 8b) in these are slidably mounted 11. The device according to claim 10, characterized in that that the bending mandrels (Ia ... IVa, Ib IVb) by means of stationary control cams (23a, 23b) are movable. 12. Device according to one or more of the preceding claims, characterized in that a wire guide (51) is arranged upstream of the guide channel (K) is in a plane aligned with the guide channel in accordance with the the bending mandrels (IaO IVa, Ib IVb) caused movement of the wire (D) can be controlled. 13. The apparatus according to claim 12, characterized in that the Wire guide (51) is designed as a wire straightening device. 14. The apparatus according to claim 13, characterized in that the Wire straightening device (51) from two groups (52,53) of the wire (D) each between leading roles (54) consists, and that the groups one behind the other and in perpendicular mutually standing levels are arranged. Stw .: wire comb binding manufacture bending chamber IT 15. The device according to claim 14, characterized in that that the axes (57) of the group (53) facing the guide channel (K) rollers (54) run perpendicular to the guide channel. 16. The device according to claim 14 and / or 15, characterized in that that the guide channel (K) facing group (53) rollers (54) on a common Holder (61) is mounted around an axis perpendicular to the guide channel (62) is pivotable.