DE3228032A1 - WIRE TENSIONER AND COLLECTOR - Google Patents

Description

PATENT LAWYERS

DR. ING. E. HOFFMANN (1930-197). DIPL.-ING. W. EITLE - D R.RER. NAT. K.HOFFMANN DIPL.-ING. W. LEH N

DIPL.-ING. K. FÖCHSLE DR. RER. NAT. B. HANSEN ARABEUASTRASSE 4 D-8000 MÖNCHEN 81. TELEPHONE (089) 911087. TELEX 05-29619 (PATHE)

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37 266 p / we

THE GLOBE TOOL & ENGINEERING COMPANY Dayton, Ohio / USA

Wire tensioning and collecting device

The invention relates to a wire tensioning and collecting device, which is particularly suitable for use in armature winding machines in which fine Wires are wound into spools at high speed. The invention can also be used in connection with other machines suitable for winding coils, including stator winding machines. In general, the invention is applicable when a wire due to an uneven requirement is unwound at high speeds.

Various types of unwinding and winder assemblies have been proposed and used. These devices are generally mounted close to a wire spool and are designed to provide a certain amount of tension or tension.

a certain tension ^on exercise .the wire. They are all typically provided with some means of leveling the tension, depending on the needs of the machine on which the wire is to be used. Available unwinding and winding devices can be satisfactorily used in many ways. However, a completely satisfactory unwinding device is not available in which coils of fine wire can be wound at high speeds, i.e. for use in connection with an armature winding machine, because of the rapidity with which the device corresponds to the various wire requirements during the winding of a coil must, and while koiranutator connections must be made between windings of the coil. Problems associated with the unwinding devices are particularly serious in connection with the winding of fine wire armatures. which is easily broken due to uneven tension applied thereto. This can result in kinking or tangling of the wire, or the wire is loaded under a greater tension than the tension that the wire can withstand. Problems associated with winding armature are intricate with the typical requirement for winding a large number of turns for each coil. For example, it is not uncommon to wind coils of more than 1500 turns using a very fine wire, such as 40 gauge wire. Armatures of this type are wound on double flyer armature winding machines and at plyer speeds of more than 3000 rpm. Taking into account that the wire is passed into the anchor slots by means of a tool, which creates the need, which necessarily creates different wire demands and requirements for each coil winding, usually

two peak intervals of high wire requirements. and two The unwinding device must have peak intervals with low or no wire requirements per winding at all be able to meet the different wire needs encounter at a rate of over 10,000 spikes per minute when winding a coil. The unwinding device so must be able to cope with relatively large changes in wire requirements during of the intervals, i.e. during intervals between the winding of the coils, in which lead wire connections be formed.

In accordance with this invention, consideration is given the above problems a wire catcher and collecting device for use as an unwinder is provided, with which very fine wires can be handled to make coils in armature winding machines at high speed to wrap. The apparatus of this invention is inexpensive to manufacture, simple and robust in operation.

The apparatus comprises a relatively simple wire tensioning assembly having a pair of friction linings which are so are mounted so that the wire is guided and runs between them and thereby the friction linings of the movement of the Oppose a frictional resistance of the wire. The friction linings have a relatively large surface area, so that the wire is contacted for a substantial length therebetween. A clamping device is provided to to press the friction linings together. The clamping device can be adjusted so that the frictional forces acting on the wire can be adjusted. After an initial Adjustment of the clamping pressure for a special winding process no further adjustment of the clamping pressure is normally required. The friction linings provide the only substantial tension that is applied to the wire so that the frictional drag on

the wire movement is substantially uniform.

The apparatus of this invention further comprises a wire collection assembly having a lightweight pendulum arm, which is pivotably mounted near one end and has an eye at the other end through which the Wire runs. A biasing force acts on the pendulum arm to pull the wire during the intervals in which there occurs a slack, which results from the operation of the anchor or the other device that the Wire pulls. The preload can be generated in the form of a weight, which is .montiert on the pendulum arm. Weight may be the only measure necessary in connection with a very fine wire, like for example a 43 gauge wire. A spring attached to the weight is used to provide the biasing force for the use of the unwinding of a wire with a higher gauge number.

The wire run through the tensioning arrangement is vertical and the course of the wire in the collecting area is preferred horizontal. The change of direction takes place through a wire disc .. In accordance with this invention a sensor is also provided, which detects the rotation of the wire disk, so that in the event of a wire break, the cessation of wheel rotation is detected. This case can be used to generate an alarm and stop operating the machine with which the apparatus of this invention is used.

To solve the above-mentioned invention, it is the object of this invention to provide a simple, insensitive to operation and to provide inexpensive wire tensioning and collecting apparatus which takes up minimal space. All mechanical Parts of the apparatus according to the invention can be on a

single plate 'which is no larger than 20 cm χ 20 cm (8 inch χ 8 inch). The sensor for displaying the rotation of the disc and thus the broken wire of the type described above can be on the same plate be mounted.

Furthermore, according to the. The present invention provides very simple means to maintain control of the wire so that the wire does not come off the wire pulley. This is done by simply installing a brush with bristles or hairs that rest on the disc and thus also on the wire, so that the wire can be prevented from jumping out of the disc groove.
15th

Further details, features and advantages of the invention emerge from the following description of the exemplary embodiments shown purely schematically in the drawings. It shows:
20th

Fig. 1 is a front view, with parts broken away, of a wire tensioning and winding apparatus of the invention shown in connection with a shown schematically Flyer (Flieger) and Flyer drive and a control circuit for an armature winding machine, whereby this figure also shows part of a wire guide cone which is used for this purpose will, the wire on its way from a supply reel to a section of a shaft

for attaching the apparatus according to the invention to the bed of an armature winding machine or to limit,

FIG. 2 shows a side view of part of the apparatus according to FIG. 1 according to the arrows 2-2 and in particular the representation of a wire tensioning arrangement,
5

3 is a cross-sectional view of part of FIG.

according to the arrows 3-3 and in particular with the representation of a pendulum arm pivot arrangement,

Fig. 4 is a plan view of a portion of the apparatus of Fig. 1 according to the arrows 4-4 and in particular showing a wire washer and anti-popping apparatus of the wire from the pulley groove, ... and with the representation of a sensor for indicating the rotation

the disk, this figure also showing schematically a wire break detector circuit, which is electrically connected to the sensor,

Fig. 5 schematically shows the wire disc and the sensor, viewed from the rear of the disc, and

6 is a partially exploded perspective view, partially broken away, of the FIG Apparatus and the associated machine part

corresponding to FIG. 1 and furthermore a wire supply reel.

In Figures 1 and 6 the apparatus according to the invention is general provided with the reference number 10. This apparatus "is used to pull an insulated wire from a Wire supply reel 12 placed in an open ended container 14 to a hollow spindle 1 & a Flyer assembly, generally designated '18, to lead. Those who use armature winding machines

• a · «

You will recognize that the wire is guided from a flyer disc 20 at the free end of a flyer arm 22 to the armature core, not shown, to be wound.
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The tension control apparatus of the invention may include a single support plate 24 mounted on a shaft 26 is. The shaft 26 is fixedly attached to a bed, not shown, of the winding machine and in a desired one Position thereon held by a clamping screw 28 in a mounting block 30, which fastening block 30 is attached to the rear of the support plate 24 by screws 32.

Wire withdrawn from the spool is prevented from unduly bulging by a wire cone 34. From there it runs the wire into a vertically extending wire tube 36 which provides for rectilinear alignment of the wire. This tube is supported on a wire alignment bracket 38 by means of a stub arrangement 42. The alignment tube 36 functions as a wire lead-in guide for tensioning and Take-up apparatus of the present invention. Those familiar with this technique will know that the wire alignment tube 36 is preferably provided with a tungsten carbide inlet eye at least at its lower end, because the wire entering through the lower end of the alignment tube 36 is spirally twisted. Because of these Otherwise, there could be considerable wear and tear on the lower end of the alignment tube 36.

Exiting from the upper end of the alignment tube 36 Wire passes through a wire tensioning assembly, indicated generally at 44. As best from Figs. 2 and 6 As can be seen, this wire tensioning assembly 44 comprises a Pair of circular, opposing, engaging friction linings 46 sandwiched between a pair of

circular clamping members are attached. These clamping members comprise a cup-shaped friction lining base member and a coil-shaped housing member 50 with a cup-shaped one larger end portion 52, which is opposite to the base member 48, so that the base member 48 and the larger End portion 52 of the housing 50 cooperate so that they hold the friction linings 46 therebetween. The friction lining housing 50 further includes a smaller end portion 54 with an outwardly protruding cylindrical one Extension 56 which is fitted into a coil spring 58. The friction linings 46, the base member 48 and the housing 50 are all provided with aligned openings that are coaxial with the helical spring 58, around an elongated one Take up threaded bolt 60, which protrudes through these 'openings and perpendicular from the front of the Support plate 24 protrudes and protrudes. One end of the bolt 60 runs through an opening 62 and the support plate 24 and is on the back of the support plate 24 with a nut 64 in threaded engagement. The opposite End of bolt 60 is threaded and threadedly engaged with a pair of knurled ones Adjustment nuts 66 and 68. As can be seen, the adjustment nut 66 can be rotated to adjust the spring 58 below Bring greater pressure, whereby the housing 50 is caused to a greater clamping pressure on the friction linings 46 to apply. This increases the frictional resistance the movement of the intermediate wire W is increased.

The friction linings can be made of various materials, with reference to the creation of a Frictional resistance to wire movement without substantially removing the insulation coating on the wire. Different materials can be used for different types of wire. For very fine wire applications, in the range of nearly 36 to 4 3 gauge, is a dense one

Felt material currently preferred. Friction linings 46 made of dense felt can be in mutual engagement with the thereby trapped wire. Since felt is pliable, felt friction linings have good wear resistance.

It should be noted that the construction of the housing 50 simplifies this for the operator caused to pull the housing by hand away from the support plate against the biasing force of the spring 58 in order to remove the Separate friction linings 46. When this is done and that is when an empty supply spool by a full spool is replaced, you can also rotate the housing 50 and with this the adjacent friction lining 46 to thereby the To change the relative position of the outermost friction lining relative to the wire path and so the wear of the friction lining small because of the manner in which the tensioning assembly parts are mounted on the bolt 60. Of course, both friction linings can be rotated by hand when the housing 50 is pulled away from the support plate 24 will.

It has been found that a relatively large length of the friction linings 46 should be in contact with the wire.

If this contact length is too short, the wire between the supply coil 12 and the tensioning arrangement 44 are twisted impermissibly and can kink, which can result in loops that break of the wire lead. For this reason, the axis of the bolt 66 is as close as possible to the vertical course of the wire, but without affecting the wire movement. For fine wire winding it was also found that circular friction linings x 46 made of heavy felt and nearly 5.4 cm (2 1/8 inch) in diameter are sufficient for the wire

runs along nearly 2 inches (5.08 cm) of the friction pads. Much smaller diameter friction linings such as 1 inch would be inadequate.

From the wire tensioning arrangement 44, the wire W is along guided around a wire disk 70 which is fastened by a roller bearing 72 on an axle 74. The shaft 74 may suitably be in the form of a screw with a large head attached to the Inner surface of the bearing 72 rests and which has a threaded end which passes through an opening 76 in the support plate 24 and is in contact with a fastening nut 78. The disc 70 is spaced in Relation to the front of the support plate 24 held by a spacer 80, the axis 74 surrounds.

The disc 70 is mounted on the support plate 24 that their wire receiving groove is vertically aligned with the vertical axis of the wire alignment tube 36. to the vertical To determine the course of the wire W and to form it. A horizontal facility is provided by the disc with a flyer spindle disk 21. Because of the change in the direction of the wire run on the disk 70 there is because of the At high operating speed of the armature winding machine, the wire has a tendency to jump off the pulley groove 82. To prevent this phenomenon from occurring, a wire holding member in the form of a brush 84 is provided, this brush having hairs or bristles 86.

The brush is attached by means of a screw 88 which passes through an opening in the brush 84 and an aligned stepped hole 90 extends in the support plate 24, the brush 24 by a spacer 92 in relation to the front of the support plate 24 is kept at a distance.

The hairs or bristles 86 essentially overlap the

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Disk 70 along the horizontal course of the wire running therefrom. Preferably the hair or Hardly or easily bristles the wire / to prevent the wire from jumping out of the disk groove 82. 5

As previously mentioned, the wire tensioning assembly 44 creates a substantially uniform tension in wire W to provide resistance which is necessary to one to enable suitable operation of the flyer assembly 18.

During those intervals in which the wire request generated by the rotation of the flyer 18 is on a Is minimum or is entirely eliminated, a relative wire slack condition becomes through the interception assembly 94 ended or added. The collection arrangement includes having a pair of spaced wire guides 96 and 98, insertion openings 100 and 102 respectively, which are coaxial with the horizontal Wire course from the wire disk 70 to the flyer spindle disk 21 are aligned. The wire guide assemblies 96 and 98 include weldments with nozzles or the like (not shown) passing through Openings extend in the support plate 24 and are suitably secured thereon. The section of wire W, which is stretched between the wire guide insertion openings 100 and 102, runs through a pendulum eye 104 at the end of a pendulum arm 106 which is pivotally mounted on the front of the support plate 24, and by means of a pendulum arm pivot arrangement 108, which can best be seen from FIG. 3. This pendulum arm pivot arrangement 108 includes a mounting shaft 110 which is rotatably mounted in a needle bearing 112, which is located in an opening of the support plate 24. The shaft 110 has an enlarged head 114 with a transverse extending opening 116 for receiving the pendulum arm 106. The front of the enlarged head 1.14 has a hollow threaded hole for a clamping screw 118, which is used for this purpose

serves to clamp the pendulum arm 106 to the pivot assembly 108. A retaining collar 120 is provided with a clamping screw 122 to hold the same on the shaft 110. This collar 120 is near the back of the Support plate 24 attached to the shaft. With suitable lubrication, the pivot assembly 108 is freely rotating Attachment of the pendulum arm 106 before.

For optimal functionality, the pendulum arm 106 is preferably as lightweight as possible so that it can be quickly moved into the position shown in Fig. 1 to 6, in which the pendulum eye 104 with the fixed Wire guide insertion openings 100 and 102 is aligned due to the fact that it is pulled through the flyer assembly 18 Wire. A suitable pendulum arm is made of 0.89 mm (0.035 inch) piano wire with a small eye made of tungsten carbide with an inner diameter of 4 mm (5/32 inch).

The lightweight construction of the pendulum arm 106 and pivot assembly 108 cause the pendulum arm to respond quickly to an increasing response Tension in the wire passing between the wire guide insertion openings 100 and 102. To that as well To give pendulum arm 106 the ability. Quickly take up the wire if it slackens, namely as a result of the movement of the eye 104 from the horizontal wire run down, the pendulum arm 106 is pretensioned, rotated counterclockwise when looking at Fig. 1 by means of biasing means in the form of a weight 124 to become. The weight can take the form of a short section of cylindrical metal rod with a have transverse opening through which the pendulum arm 106 extends. There is a stepped hole in one End of the same for receiving a clamping screw 126 to

Attaching the same to the pendulum arm 106. The weight 124 further includes an opening for receiving one end of a coil spring 128. The other end of the spring is received within an opening 130 of a spring arm 132 which is fastened to the support plate 24 by one of the aforesaid fastening screws 32 and is spaced from the front of the support plate 24 by a spacer. The spring arm 132 is provided with a plurality of spaced apart openings / in order to provide an additional adjustment of the spring tension on the pendulum arm 106. Further adjustment can be achieved by loosening the clamping screw 126 and moving the weight 124 along it. In such applications, the coil spring 28 may not be necessary particularly in the Verwehdung of a very fine wire of 43 gauge and the weight _r be sufficient to provide 124 to the desired collection. It will be apparent to those skilled in the art that the pendulum arm 106 rotates clockwise as shown in FIG. 1 when it is necessary to remove slack created during the intervals of flyer rotation and at intervals when the flyer stops or vice versa rotated when lead wire connections need to be made. The maximum clockwise rotational movement of the pendulum arm 106 can be limited by a stop 136. This stop can consist of a roller pin which is inserted in an opening in the support plate 124. It can thus be seen that the catching arrangement, generally designated 94, provides a widely adjustable preload to be applied to the pendulum arm 106, which pendulum arm 106 is advantageously provided with an eye 104 for catching the slack. The use of an eye 104 is considered in view of the very high speeds at which the armature winding machine is operated

can be considered necessary. to ensure, that the wire does not come off the pendulum arm.

In accordance with the invention, the wire disk 70 can also be used in a system for detecting the Wire break can be used, so that an alarm is generated to initiate the operation of the winding machine or stop. 5 and 6, the disk 70 is made of nylon or other non-conductive material Plastic material with a metal foil or the like cover 138 over a segment of a circle on the rear side. A proximity detector or other suitable sensor 140 is attached to the support plate by means of a mounting plate 142 24 attached. This mounting plate 142 is on the rear the support plate 24 by means of the disk axis 70 and its .Befestigungsnut 78 and a fastening screw which is screwed into a stepped hole 146 of the support plate 24. Preferably, the support plate is 24 provided with a notch 148 through which the feeler 140 partially protrudes so that it is near the rear of the Wire disk 70 lies. Signals from the sensor 140 can a suitable wire breakage detector circuit, which is shown schematically and with the reference number 150 is provided to indicate disk rotation.

Such signals are used by the detector 150 for this purpose determine whether the disc 70 is still rotating or not. In the event that the rotation during a Interval in which it should stop rotating, which can be caused by a wire break appropriate alarm can be triggered. This alarm would interrupt the operation of the conventional flyer drive and cause control circuit, which is shown schematically in Fig. and with the reference number 152 is provided. This flyer drive and control circuit is used to operate the flyer assembly 18

to control. In order to ensure that the disc 70 rotates constantly while the wire W is being drawn from the supply spool 12, it is necessary to keep the wire W completely loop around the disk 70. In other cases there is a simple run of the wire around the Disk 70 is sufficient.

A suitable support plate 24 need not be larger than 8 "by 8" (8 "by 8") in accordance with the invention. be. All of the wire guide members attached to the support plate 24 are preferably in a particular one Spaced therefrom, thereby reducing the longitudinal axes of all of the stretching of the wire from the lower end of the Alignment tube 36 to flyer spindle disk 21 is caused to lie in a common vertical plane, in order to minimize the forces acting on the wire as it passes through the apparatus according to the invention emotional.

As previously mentioned, there are the insertion eye at the lowermost end of the alignment tube 36 and the eye 104 of the pendulum arm made of tungsten carbide ,. because of the wear resistance. The same applies to the wire eyes 100 and 102.

Claims (10)

· EITLE & PARTNER PATENTANWÄLTE DR. ING. E. HOFFMANN (1930-1976) DlPl.-ING. W. EITLE <DR. RER. NAT. K.HOFFMAN N. DIPL.-ING. W. LEHN DIPL.-ING. K. FDCHSLE. DR. RER. NAT. B. HANSEN ARABELLASTRASSE 4. D-8000 MO NCHEN 81 TELEPHONE (089) 911087. TELEX 05-29619 (PATHE) 37 266 p / we THE GLOBE TOOL & ENGINEERING COMPANY Dayton, Ohio / USA Wire tensioning and collecting device claims 1. Wire tensioning and collecting device for use with a wire to be unwound from a supply reel at high speeds by a guide device (36) for the incoming wire, which is arranged in the vicinity of the coil and through which the one coming from the coil. Wire runs through a catcher assembly (94) with a pair of spaced apart guide means (100, 102) with which the wire comes into engagement and which form a course along which the wire moves with a pendulum arm (106), on which a pendulum eye (104) is arranged, through which the section of the wire runs, which is tensioned between the guide devices that form the wire course, and with a pretensioning device (124) for pretensioning the pendulum arm and for ■ * · O M Pulling the last-mentioned wire section from its formed by the guide devices (100, 102) Course for taking up slack and by a wire tensioning arrangement (44) which has a friction device (46) for gripping the wire between the guide means (36) for the incoming wire and the collecting assembly, and further comprising adjustable clamping means (50) for applying a Pressure on the friction device (46), for creating an adjustable frictional resistance the tensioning assembly to the wire movement. 2. Apparatus according to claim 1, characterized in that the friction device (46) Includes friction linings which are in contact over a certain length with the wire, namely substantially for preventing twisting and entanglement of the wire running off the spool. 3. Apparatus according to claim 2, characterized in that the friction linings from a dense Consist of felt material. 4. Apparatus according to claim 2 or 3, characterized in that g e k e η η, that a pair of friction linings is provided. 5. Apparatus according to claim 4, characterized in that the friction linings (46) miteinan- which have aligned openings through which a bolt (60) protrudes from a support plate (24) that the adjustable clamping device (50) comprises a clamping member which engages one of the friction linings stands and is slidably mounted on the bolt (60) that a helical spring (58) surrounds the bolt and engages the clamping member (50), and that an adjusting nut (66) is screwed onto the bolt and engages the spring to compress it. 6. Apparatus according to any one of the preceding claims, characterized in that the pretensioning device (124) comprises a weight which is displaceable along a pendulum arm (106), wherein the weight is releasably clamped on the pendulum arm. 7. Apparatus according to claim 6, characterized in that the pretensioning device further comprises a spring (128) connected to the weight. . 8. Apparatus according to one of the preceding claims, characterized in that a direction changing device (70) with the guide device (36) is aligned for the incoming wire, namely for moving the wire on a essentially vertical path between these Guide device (36) and the direction changing device (70), and that the guide devices (100, 102) cooperates with the direction changing device (70) for moving the wire on an essentially horizontal course when it is behind the direction changing device (70) emotional. 9. Apparatus according to claim 8, characterized in that the direction changing device (70) comprises a disk around which the wire is at least partially wrapped. 10. Apparatus according to claim 9, characterized by means (140) for indicating the rotation the disc for detecting a wire break.