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(11) | EP 0 739 066 A2 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Apparatus for uncurling electric wires and method for using same |
| (57) A wire decurling apparatus (100) occupies a minimum of space and has two interconnected
subassemblies (1, 2) which are hinged together so that the upper subassembly (2) may
pivot with respect to the lower subassembly (1). Each subassembly (1, 2) has a plurality
of rollers (11, 11') arranged therein which are shifted in two directions with respect
to each other, thus subjecting the wires to both to vertical and lateral bending simultaneously
while passing through the apparatus (100). |
Background of the Invention
[0001] The present invention generally relates to an apparatus for reshaping the configuration of electrical wires, and more particularly to removing curls from electrical wires after they have been unwound from supply spools.
[0002] When electrical wires are connected to electrical connectors, such as what occurs in the manufacture of wire harnesses, the wires are typically unrolled from supply spools of wire. These wires are measured as they are unrolled and often acquire a "curl" from being stored in a wound condition of the supply spool as well as during the measuring process, thus resulting in a significant amount of residual curl.
[0003] The feeding of these wires to a termination assembly usually occurs in a straightline path, and if the wires have any residual curl as they come off of the supply spools, this curl may affect the efficiency and reliability of the terminating assembly at which location the wires are terminated to electrical connectors. Thus, it becomes necessary to "decurl" these wires in order to facilitate the handling and termination of the wires to their associated connector elements.
[0004] Wire decurling apparatuses are known which use two sets of opposing rollers in which wires are arranged to travel between them, such as that shown in Japanese Utility Model application No. 6-9087. These decurling apparatuses are often referred to as wire straighteners or wire reshapers. In the wire decurling apparatus in the aforementioned Utility Model application, the rollers of one set are shifted to lie between the rollers of the other set such that the rollers of the one group extend between two rollers of the other group in adjacent steps so that the rollers of these two opposing groups overlap each other vertically. This overlapping decreases in the direction of travel of the wires.
[0005] With a view to attaining the complete decurling of wires, two individual wire straighteners are arranged in series, namely, one after another, in the direction in which the wires travel so that the wires are forced to uncurl in both the longitudinal and lateral directions. These forces effect a straightening of the wires. However, in this type of decurling apparatus, the threading of the wires through the opposing rollers of the wire straighteners in series is a tedious and time-consuming task. Apart from the tedium, another disadvantage of such a decurling apparatus is that the wire straighteners as arranged in series occupy a relatively large space.
Summary of the Invention
[0006] One object of the present invention is to provide a decurling apparatus and method for decurling wires in which the registering of wires in the apparatus is facilitated.
[0007] Another object of the present invention is to provide a wire decurling apparatus which facilitates the registration of wires, and which does not require a large amount of space for installation.
[0008] A still further object of the present invention is to provide a decurling apparatus having two interengaging decurling roller assemblies which apply displacements in both the longitudinal and lateral directions to wires entering the apparatus.
[0009] These objects and advantages may be attained by providing a wire decurling apparatus having a plurality of opposing wire rollers which bend wires passing through the apparatus simultaneously in two different, intersecting directions.
[0010] A method of decurling wires by causing the curled wires to zigzag between two groups of opposing wire rollers arranged so as to form a plurality of force-application points, is improved according to the present invention in that it comprises the steps of: interposing a first set of spaced-apart wire rollers between a individual wire rollers of a second adjacent set of wire rollers that the opposing rollers of the two sets vertically overlap each other and displacing one group of rollers transversely or horizontally with respect to the other group of rollers.
[0011] In such a method, the horizontal, transverse displacement and the overlapping vertical displacement of the rollers is arranged to decrease from the entrance to the exit of the apparatus in the direction in which the wires travel through the apparatus. A plurality of electric wires which pass through the apparatus encounter a corresponding plurality of wire rollers arranged at each application point, thereby uncurling such a plurality of electric wires simultaneously.
[0012] With the arrangement described above, a single wire decurling apparatus is provided which permits the simultaneous bending of wires in two directions in a reduced space. The registering of the wires is made simpler by raising the moveable frame assembly apart from the stationary frame assembly, thus opening the apparatus wide enough to facilitate the registering of the wires in place therein.
[0013] These and other objects, features and advantages of the present invention will be clearly understood through a consideration of the following detailed description.
Brief Description of the Drawings
[0014] In the course of the following description of the detailed description, reference will be made to the attached drawings wherein like reference numerals identify like parts and wherein:
FIG. 1 is a side elevational view of a wire decurling apparatus constructed in accordance with the principles of the present invention;
FIG. 2 is a top plan view of the wire decurling apparatus of FIG. 1;
FIG. 3 is a sectional view of the wire decurling apparatus of FIG. 1 taken generally along line X-X thereof;
FIG. 4 is a sectional view of the wire decurling apparatus of FIG. 1 taken generally along line Y-Y thereof;
FIG. 5 is a sectional view of a mounting end of one of the rollers of the decurling apparatus of FIG. 1;
FIG. 6 is a schematic view illustrating how the upper wire-straightening frame moves in relation to the lower wire-straightening frame;
FIG. 7 is a schematic view illustrating the lower wire-straightening frame prior to any horizontal displacement of any rollers therein; and
FIG. 8 is a schematic view illustrating the lower wire-straightening frame after horizontal displacement of selected rollers thereof.
Detailed Description of Preferred Embodiments
[0015] FIGS. 1 and 2 illustrate an embodiment of a wire decurling apparatus 100 constructed in accordance with the principles of the present invention. It can be seen from these drawings that the apparatus 100 includes a lower wire-straightening frame assembly 1 and an upper wire-straightening frame assembly 2 which is pivoted to the lower frame 1 at a pair of brackets 6 which are located near the exit 102 of the apparatus 100.
[0016] The lower frame assembly 1 is generally rectangular in shape and includes a base plate 3, a pair of brackets 6 fixed to the base plate 3 near the exit 102 of the lower frame assembly 1 and a pair of opposing side members 5 extending therefrom. The upper frame assembly 2 of the apparatus 100 is journaled for rotation in the brackets 6 by way of a pivot pin 7 extending between the brackets 6. The upper frame assembly 2 also includes a pair of opposing side members 8 which receive the lower member pivot pin 7 therebetween and which are further connected together by way of a lifting rod 10 which extends between two forward lugs 9 of the upper frame assembly 2 located near the entrance 104 of the apparatus 100. The upper frame assembly 2 is capable of rotation about the pivot pin 7 to rise away from and close upon the underlying lower frame assembly 1.
[0017] A plurality of wire rolls, or rollers, 11, 11' are provided within the lower assembly frame 1 and the upper assembly frame 2, respectively. Specifically, the lower frame 1 assembly is illustrated as having seven lower axles 12 fixed at regular intervals between its opposing side members 5. Each such axle 12 includes a plurality of rollers 11 rotatably mounted thereon by way associated bearings 13. (FIG. 5.) These axles 12 are spaced apart in a horizontal spacing so that an intervening space 106 is formed between adjacent rollers 11. Preferably, the axles 12 are further mounted at equal elevations so that a generally level bed, or first set, of rollers 11 is defined in the lower frame assembly 1. Likewise, the upper frame assembly 2 has seven similar upper axles 12' fixed at regular intervals between its opposing side members 8 and each axle 12' includes a plurality of wire-rollers 11' rotatably mounted thereon by way associated bearings 13'. These rollers 11' are also spaced apart from each other with intervening spaces 108 to define a bed, or second set, of wire rollers 11' in the upper frame assembly 2.
[0018] It should be noted that the rollers 11' of the upper frame assembly 2 have a spacing which is equal to that of rollers 11 of lower frame assembly 1 but offset from the lower frame assembly 1 in that the upper rollers 11' are shifted longitudinally one half the distance between rollers 11 so that they are interposed between the rollers 11 of the lower frame assembly 1. As seen from FIG. 5, each roller 11, 11' preferably has a circumferential groove 14 formed therein, which permits a wire to be inserted and held therein in order to decurl it. As shown in FIG. 5, the groove 14 is deep enough so as to provide significant lateral support to the wires in order to retain the wires within the rollers.
[0019] As seen in FIG. 2, an actuating member 15 extends lengthwise along one side of the lower frame 1 and is connected to another piston-cylinder type of drive unit 18. The actuating member 15 is mounted by way of a pin 17 at the base plate 3 of the lower frame 1 so that it is capable of pivotal movement in the direction indicated by arrow 19. This actuating member 15 is operatively connected to all of the axles 12 of the wire rollers of the lower frame assembly 1 except the axle adjacent base plate 3 by way of pins 16. This connection is shown best in FIG. 4.
[0020] In this regard, the ends 114 of the lower axles 11 extend through one side member 5 (shown at the left in FIGS. 3 & 4) in order to effect the connection to the actuating member 15. When the actuating member 15 is pivoted about pin 17, it causes a lateral displacement in the horizontal plane of the lower axles 11 and their rollers 12. FIG. 7 schematically illustrates the apparatus in a condition prior to this lateral displacement, while FIG. 8 schematically illustrates the apparatus after the lateral displacement has taken place. This displacement is divergent along the length of the apparatus and the amount of this transverse, or lateral displacement, is greatest near the entrance 104 of the apparatus 100 and gradually decreases toward the exit 102.
[0021] The upper frame assembly 2 has a drive unit 20 associated therewith, which includes, as illustrated in FIG. 1, a piston-cylinder assembly 116 which engages the front lifting rod 10, thereby pivoting the upper frame assembly 2 about pivot pin 7 in the directions as indicated by arrows 21 and 22. Specifically, when the upper frame assembly 2 pivots upwardly about pivot pin 7 in the direction as indicated by arrow 21, it rises away from the underlying lower frame assembly 1 so that its rollers 11' move away from the rollers 11 of the lower frame assembly 1. When the upper frame assembly 2 rotates in the opposite counter direction, toward the lower frame assembly 1 as indicated by arrow 22, it comes to rest on the lower frame assembly 1 with the upper frame rollers 11' overlapping the rollers 11 of the lower frame assembly 1 and descending into the opposing intervening open spaces 106 of the lower frame assembly 1 so that they are interposed between the rollers 11 of the first frame assembly 1. As seen in FIG. 6, this "overlap" decreases gradually from the entrance 104 of the apparatus 100 towards the exit 102. For example, it can be seen that the lower surface of the groove 14 of the upper roller 11' closest to the entrance 104 is substantially below the upper surface of the groove 14 of the adjacent lower roller 11 closest to entrance 104. On the other hand, the lower surface of the groove 14 of the upper roller 11' closest to exit 102 is close to the same level as the upper surface of the groove 14 of the adjacent lower roller 11 closest to exit 102.
[0022] Referring to FIGS. 6, 7 and 8, the manner in which wires 23 are decurled or straightened by utilization of the apparatus 100 is described below. In these drawings, the wires 23 are shown in phantom and are representative of wires which are fed off of wire supply spools for assembly and termination into wire harnesses or other components. The wires 23 enter the entrance 104 of the apparatus at a wire retainer 4 (FIG. 1) and exit from the apparatus at the exit 102 adjacent stationary plate 3. These wires 23 may be initially fed into the apparatus 100 through the wire retainer 4 when the upper frame assembly 2 is pivoted upwardly to the position indicated by arrow 21 to expose the rollers 11 of the lower frame 1. The wires 23 are then fed into the grooves 14 of the lower frame rollers 11 along the length of the apparatus 100 from the entrance 104 at the wire holder 4 to the exit 102 at plate 3. The lateral actuating rod 15 is initially positioned at its retracted position as shown in FIG. 7, wherein it extends parallel to and along the longitudinal side 8 of the lower frame assembly 1 in order to facilitate the feeding of the wires 23 through apparatus 100. In this initial position, rollers 11, 11' are in linear alignment.
[0023] After feeding the wires 23 through the lower frame assembly 1, the upper frame assembly 2 is pivoted downwardly, as indicated by arrow 22, until it rests on the underlying lower frame 1 with the rollers 11, 11' of each frame assembly overlapping each other vertically and with the wires 23 extending through rollers 11, 11'. The actuating rod 15 is then laterally displaced from the longitudinal side of the stationary frame 1 by pivoting the actuating rod 15 around its pivot pin with the aid of the piston-and-cylinder drive unit 18. The wires 23 can then be driven through the apparatus 100 from the entrance 104 to the exit 102 thereof in the ordinary course of manufacturing harnesses in order to decurl or straighten the wires.
[0024] Owing to the vertical overlapping and horizontal, lateral displacement of the rollers 11 of the lower and upper frame assemblies 1, 2, the wires 23 are simultaneously subjected to both vertical alternating displacement or bending (illustrated in phantom in FIG. 6) and lateral or horizontal alternating displacement or bending (illustrated in phantom in FIG. 8) as the wires 23 pass through the apparatus 100. The amount of vertical and lateral displacement decreases gradually in the direction of wire travel, namely from the entrance 104 to the exit 102 of the apparatus 100. This causes the wires 23 to be subjected to bending such that the curl of the wires 23 is gradually reduced little by little until a complete decurling is attained at the exit 102 of the wire straightening apparatus 100.
[0025] The number of the bending increments depends on the number of axles 12, 12' which may be varied to meet the amount of decurling necessary. Therefore, the particular number of axles in the embodiment described above should not be considered as limiting. The number of the rollers 11, 11' at each axle will generally correspond to the number of circuits of the electrical connectors to which wires are to be connected.
[0026] It will be appreciated that the embodiments of the present invention discussed herein are merely illustrative of a few applications of the principles of the invention. Numerous modifications may be made by those skilled in the art without departing from the true spirit and scope of the invention.
a plurality of first and second subassembly pairs (1,2), each first subassembly being operatively connected to a second subassembly, said apparatus having opposing entrance (104) and exit (102) portions;
each first subassembly (1) having a plurality of first wire-engaging rollers (11), each of the first rollers (11) having at least one exterior working surface (14) disposed thereon for contacting a wire (23) fed into said apparatus (100), the first rollers (11) being generally arranged in a first set within said first subassembly (1), said first rollers (11) being spaced apart longitudinally between said entrance and exit portions so as to define first intervening open spaces (106) between adjacent first rollers (11);
each second subassembly (2) having a plurality of second wire-engaging rollers (11'), each of the second rollers (11') also having at least one exterior working surface (14') disposed thereon for contacting a wire (23) fed into said apparatus (100), the second rollers (11') being generally arranged in a second set within said second subassembly (2), said second rollers (11') being spaced apart longitudinally between said entrance and exit portions so as to define second intervening open spaces (108) between adjacent second rollers (11');
one of said first rollers being aligned with each said second intervening open spaces and one of said second rollers being aligned with each of said first intervening open spaces;
said first and second rollers of each said first and second subassembly pairs cooperating to define a wire feeding path, the working surfaces of said first rollers being on a first side of said wire feeding path and the working surfaces of said second rollers being on a second, opposite side of said wire feeding path;
the working surfaces of at least some of said first and second rollers of each said first and second subassembly pairs being offset in first and second generally perpendicular directions, said at least some of said first and second rollers being offset predetermined distances from a straight line extending between said entrance and exit portions, the distances between said working surfaces and said straight line decreasing along said apparatus from said entrance portion to said exit portion.
providing a plurality of rollers (11,11') spaced apart from each and disposed in opposing first and second sets of rollers, each of the first and second rollers having a wire-engagement surface (14,14') disposed thereon;
feeding a plurality of wires along said wire engagement surfaces of one of said sets of rollers;
drawing said first and second roller sets (11,11') together such that rollers (11) of said first roller set are interposed between the rollers (11') of said second roller set and rollers of said second roller set are interposed between said rollers (11) of said first set, said wire engagement surfaces of the other of said sets of rollers engaging said wires, said wires (23) following said wire-engagement surfaces (14,14') of said first and second rollers in opposing vertical directions; and
displacing one of said first and second roller sets transversely with respect to the other of said first and second roller sets to thereby displace wires (23) following said wire-engagement surfaces (14,14') of said first and second rollers (11,11') in opposing horizontal directions.