DE2707624A1 - LADDER FEED DEVICE - Google Patents

Description

The invention relates to a ladder feed device.

DT-PS 952 888 describes a ladder feed device with a feed roller that can be rotated around its axis, with a motor driving the feed roller around its axis, with a motor that is parallel to the feed roller axis Axis rotatable pressure roller, and with a control unit for gradually moving the pressure roller between one

709834/0768

Bayerische Vereinsbank 823101 Postal check 54782-809

AMP 3693 - Z -

first, the feed roller adjacent conductor feed position and a second, distant from the feed roller Position in which there is no ladder feed according to a specified ladder feed program,

The conductor feeding device according to the invention can feed a plurality of conductors to manufacture one Conductor bundle whose head are of different lengths and whose conductor ends in the axial direction to each other can be offset.

The ladder feed device according to the invention is characterized by cooperating with the same feed roller further pressure rollers, the control unit is arranged so that the pinch rollers are selectively movable between their first and second positions and the feed roller is driven and stopped, whereby the according to the ladder feed program the conductor lengths to be advanced can be determined.

A major advantage of the measure of determining the advanced lengths of the ladder while rotating the feed roller consists in that the fed conductor lengths by a single counting unit, which is determined by the Feed roller or, in particular, the feed roller drive can be switched on, can be monitored. If the If the feed roller were to rotate uninterruptedly and not in steps, means would be required for the revolutions counting each individual pressure roller.

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The control unit includes members for accelerating the Feed roller from the rest position with essentially constant speed and for subsequent braking at a substantially constant speed until the feed roller stops.

This has the advantage that the conductor feed speed is greatly increased.

In a preferred development of the invention it is provided that the feed roller during predetermined time intervals is drivable to incrementally advance multiple conductors, the ladder during each such time interval be advanced by the same amount. This allows you to monitor the simultaneous feed the same meter can be used for several conductors.

An embodiment of the invention is explained in more detail below with reference to the drawing. Show it:

1 is a perspective view of a first conductor bundle;

Fig. 2 is a plan view of the ladder feed device with ladder feed roller;

Fig. 3 is a side view in section through a

Ladder feed unit of the device according to FIG. 2;

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4 shows a section IV-IV according to I'ig. 3;

5 shows a section V-V according to FIG. 3, with parts omitted and other parts superimposed and are shown in plan view;

6 shows a block diagram or a circuit diagram and 6A a control circuit for the device, the two circuit diagrams being connectable to one another along the lines A-A;

7 shows the circuit diagram of a drive motor system of the device;

Fig. 8 is a diagram showing the procedures for advancing conductors to make one of five Ladder existing bundle of Fig. 1 shows required steps, wherein the Conductors have predetermined different lengths;

Fig. 8A is a diagram showing the conductor advancement steps for making a second bundle of conductors illustrates;

Figure 9 is a graphical representation of the speed of a conductor feed roller of the device during several feed steps for producing a conductor bundle according to FIG. 1;

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Fig. 10 is a side view of a pressure and

a feed roller in contact with a conductor, being on the conductor during forces acting on the advance are illustrated;

11 comparative speed-time curves for Drive electric motors coupled with ladder feed rollers.

FIGS. 2-7 show a device for producing bundles 12 (see FIG. 1) of conductors W1-W5 which, for. B. are bundled together by means of a ladder belt 14. The conductors of the conductor bundle have graduated lengths, where the conductor W1 is the shortest, the conductor W2 the second furthest, and so on. The ladder can follow Need to be different or have different diameters. The right (see. Fig. 1) ends of the ladder are laterally aligned with each other. Such conductor bundles are used for the production of cable harnesses, for. B. For motor vehicles, washing machines or the like. Required. Connecting links are attached to the conductor ends in the course of the cable harness production.

According to FIG. 2, the device comprises a ladder feed unit 16, an electric drive motor 18 and one Control and programming unit 20, which is used to produce conductor bundles with conductors of different lengths is programmable. The conductors are from supply reels

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22, 24, 26, 28 and 30 settled on a common Shaft 32 are arranged, and extend from the supply reels to the feed unit 16. The from the feed unit 16 conveyed conductors are cut by knives 82, so that a plurality of cut off Conductor pieces is obtained, which are then used to form the conductor bundle 12 by an applicator 86, the straps 14 around the severed conductor pieces are bundled together.

According to the Pig. 3-5, the feed unit 16 comprises a base frame with a bed 34 and parallel side walls 36, which have bearings 40 for the shaft 38 of the electric motor 18; on the shaft is a ladder feed roller 42 wedged. The side walls 36 have cutouts 46 (see. Fig. 4) for receiving lower Guide members 48 and 52 (see. Fig. 3) and upper conductor guide members 50 and 54, wherein the latter parallel spaced apart grooves 56 for pinch rollers 58a-58e and conductor tendons 76, the still to be explained have.

There is a separate pinch roller 58a-58e for each ladder intended; each pressure roller is in one of the rooms received and rotatably mounted on a pin 60 supported by a lever 62 with two spaced rods (see. Fig. 5) is held. Each lever 62 extends from its pin 60 to the right (in Fig. 3) over the Pages 36 and is on a separate

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Fork shoe 66 connected, the one on a piston rod arranged by several piston-cylinder units 7Oa-7Oe is.

On the other side of each pin 60, each lever is pivotally mounted on a shaft 74, which is all the levers 62 is common and is fastened in lugs 36 '(see FIG. 5) of the side walls 36. The ladder tendon 76 is secured by a fastener 78 to the end of each lever 62 remote from pivot 64, and extends into the associated groove 56. Levers 62 are typically counterclockwise extreme angular pitch around the shaft 74, so that the Conductor clamping members 76 normally tension the conductors in grooves 56 against conductor guide member 48, and thus the pinch rollers 58a-58e are held out of contact with the ladders so that the ladder cannot be advanced are. The conductors can be advanced selectively in that the piston-cylinder units 70a-70e are selectively switched on so that they extend their piston rods and the pinch rollers assigned to the selected conductors toward the feed roller 42 and into contact with these conductors, the one associated with each pinch roller Conductor clamping member 76 is moved away from its conductor so that the conductor when the Electric motor 18 is advanced. From this explanation it can be seen that either all conductors at the same time or a single conductor or a combination of conductors can be advanced by switching on the corresponding Piston-cylinder unit 7Oa-7Oe.

^270762A

A bundle of conductors 12 is fed through a series of conductor advancement steps manufactured according to FIG. 8. During the first feed step, the pressure roller 58e rests against it Conductor W5 on, the motor 18 is switched on and runs until the conductor W5 has moved a distance accordingly L "5 - L4 is advanced, where L5 and L4 are the lengths of the conductors W5 and W4 to be made; then the engine is switched off. During the second feed step, the motor is switched on again, wherein the pressure rollers 58e and 58d rest on the conductors W5 and W4, and runs until these conductors are advanced by a distance corresponding to L4 - L3. During the third feeding step, the ladder will W5, V / 4 and W3 equally advanced by a distance corresponding to L3-L2, and during the fourth advance step the conductors W5, W4, W3 and W2 are advanced by a distance corresponding to L2 - L1. At the fifth Feed step, all conductors are advanced by a distance L1, i.e. by the length of the conductor W1. Thereafter, the conductors extend out of the conductor feed unit 16, with their front ends corresponding to FIGS. and 8 are positioned and are severed behind the feed unit 16 by the knives 82 (see. Fig. 2), so that the rear ends of the severed ladder are flush with one another. The ladder could of course also be cut like this be that their rear ends are offset from one another in the axial direction.

It will now be referred to FIGS. 6, 6A and 7 the control unit of the facility explained. According to Fig. 6A, the control unit comprises a digital control stage 108,

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the ζ. B. is a model 1220 digital computer from Data General Company, Southboro, Mass., USA. The control stage 103 receives signals from several sub-stages to be explained and generates signals., The are transmitted to the sub-stages to operate the ladder feed unit 16 and the timing and Coordinate the operation of different parts of the facility. The control stage 108 is therefore designed in such a way that that they are to be actuated piston-cylinder units 70a-70e and their actuation sequence on the basis of signals from an operator control panel 137 and performs arithmetic operations, e.g. B. L2 - L1, which goes to Manufacture of a conductor bundle with a predetermined shape are required.

The control stage 108 is connected at 106 to an interface stage in the form of a converter 104, the logical one Converts voltage signals of the control stage 108 into logic voltage and other signals for the sub-stages. The implementer 104 is thus a digital input-output stage and is e.g. B. a model 5602 of the aforementioned manufacturers.

The lengths of the conductors W1-W5 are determined by setting five separate binary-coded decimal preselector switches 88a-d, 90a-d, 92a-d, 94a-d and 96a-d of a conductor length input stage 101 is set, whereby each preselector can be set to four digits. The selection switches are connected to common highways 98a-d, the

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via logic gates 100 with a TTL input circuit card 102 of the converter 104 are connected. The logic elements are voltage level converters, because the preselection switches of level 101 with higher Voltage work as the input circuit board 102. The converter 104 is also through a TTI output circuit board 109 connected to the preselection switches, via a line 110 and individual selection lines 112 connected to the individual preselection switches for multiplying data of the preselection switches of the stage 101 to the multiple lines 98a-98d, so that the preselection switches are checked sequentially by the control stage 108 can be. The lengths of the various conductors W1-W5 of the conductor bundle are thus easy to adjust the preselection switch of the stage 101 adjustable, so that the information stored therein via the converter 104 of the Control stage 108 can be fed, which determines the optimal conductor feed sequence on the basis of this information. the individual piston-cylinder units 7Oa-7Oe are through Solenoid-operated air valves 114a-114e can be switched on, the output part 120 of the converter 104 are connected via lines 118, the lifting magnet diodes 116 are connected in parallel.

The operator control panel 137 includes control switches for the device. Some of these switches can be operated manually be, such as B. a switch 136 and a ladder feed switch 135, which will be explained.

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For the simultaneous advancement of all conductors at a predetermined speed, a hand-operated one is available Ladder feed unit provided. This is mainly used during the layout of the facility and comprises a reed relay output 129 of the converter 104, which via lines 131 with a motor control stage 122 connected sit. When the switch 135 is turned on, all of the piston-cylinder units become 7Oa-7Oe actuated by air valves 114a-114e, and the motor 18 is also switched on. The reed relay output 129 is used to control the motor 18 bring level 122 under manual control.

The motor stage 122 is connected to a TTL output 130 of the converter 104 via a line 128. The engine control stage 122 receives command inputs on line 128 and sends engine status output signals, regarding the running time of the electric motor. 18, via a line 124 to an input 126 of the converter 104, the Converts 24 V signals from the motor into 5 V signals, which the Control stage 108 can be supplied via connection 106. Since the motor 18 must be switched on and off very quickly when the conductor feed is exact should, and therefore should have a low inertia, a printed circuit motor is preferably used. In particular, the feed roller 42 should have low inertia. The speed of the motor 18 is of a Tachometer 166 (cf. Pig. 7) is monitored, which is connected to a rotating encoder 170 for monitoring the angular displacement

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Shifting the motor and thus the advanced conductor lengths is assigned.

The motor control stage 122 receives via line 128 data relating to the conductor length that is used during each Ladder feed step is to be advanced. This data is stored in the motor control stage 122 during a conductor feed step stored, and the control stage 108 causes the motor 18, the feed roller 42 by the the correct number of revolutions so that the desired wire lengths are advanced.

So that the head of the feed roller 42 as fast as is advanced possible, the motor 18 is designed so that it is switched on with high and substantially accelerated at constant speed to normal operating speed and then at high and substantially constant speed is braked until it comes to a standstill. A known tax bracket for this purpose is shown in block form in Fig. 7 and can, for. B. the System 500 from Control System Research Incorporated, Pittsburg, Pa., USA.

According to FIG. 7, the control stage comprises a buffer memory and synchronous counter element 142 which receives and stores information supplied via line 128. Output lines 144 of element 142 are connected to a digital-to-analog converter 146, the output 148 of which is again connected to a square root calculator 150. This is via line 152 to a feedback latch

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154 connected, the output line 158 of which is connected to a servo amplifier 160, which via a line 162 supplies the motor 18 with energy. The motor 18 has a tachometer 166 and an encoder 170 on its shaft. The tachometer 166 is connected to the servo amplifier 160 via a line 168. The encoder 170 is over a line 171 is connected to a driver 172, which in turn is connected to a clock signal generator 176 via a line 174 is connected; the clock signal generator 176 is connected to the element 142 via a line 178, The output of driver element 172 is via line 174 and line 175 to the feedback circuit 154 connected. Furthermore, the element 142 is connected to the feedback switching element 154 via a line 156.

During a conductor feeding step, the buffer storage part receives of the member 142 data, after which a predetermined length of conductor is to be advanced, which requires that the motor 18 performs a predetermined number of revolutions. The counter part of the element 142 generates an error signal, which is proportional to the length of the conductor to be advanced and is fed to the converter 146 via the lines 144, the output of which is fed to the square root calculator 150; its output signal is in turn the Feedback element 154 via, the line 152 is fed. The square root calculator 150 provides the necessary transformation, so that the braking of the motor 18 with desired speed can be done. During the

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Conductor advance is a signal from the memory portion of member 142 via line 156 to the feedback member 154, so that it forwards the signal on line 152 via line 158 to servo amplifier 160, which then supplies the line 162 with energy to drive the motor 18, so that the latter drives the feed roller 42 drives to the ladder feed. The speed of the motor 18 is controlled by a control loop comprising the tachometer 166, the line 168, the servo amplifier 160 and the motor 18.

During a conductor advance step, encoder 170 generates signals indicating the number of revolutions the motor will make 18 has carried out, display, amplified in the driver element 172 and the clock signal generator 176 and the feedback switching element 154 are fed. While the ladder advanced is,) these signals are blocked in the feedback element 154 as long as a motor end position signal on the Line 156 indicates that there is still a piece of conductor to be advanced, and the clock signal generator 176 provides the counter part of the gate 142 corresponding signals which reduce the content of the buffer memory portion of the gate 142 and the content of the counter with regard to the advanced length of the ladder. The counter part then changes to correct Sage the error signals given on lines 144.

When the desired length of conductor material is advanced, the motor end position signal on the line causes the feedback gate 154 to have all of the signals sent from the encoder 170 to the servo amplifier 160

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lets through. After termination of the conductor feed form the feedback element 154-, the servo amplifier 160, the Motor 18 and encoder 170 as well as lines 171, 174 and 175 a motor end position control loop in relation onto the shaft of the motor 18 and thus the feed roller 42, the motor position being equal to the length of the conductor advanced is.

These circuit parts are connected to one another in order to achieve a high and essentially constant acceleration of the To produce engine 18 until its normal operating speed is reached. The digital control stage 108 and the others Control elements are designed so that a braking of the motor 18 with high and substantially constant Speed is effected so that the motor 18 stops when the desired length of conductor is advanced. Normally the acceleration of the motor 18 is not exactly constant, but fluctuates somewhat, as if by the solid line is indicated in Fig. 11; where the ordinate is in cm / sec in relation to the line speed V and the abscissa in / Usec in relation to the time t required for advancing a ladder length L of 254 cm is required, calibrated. Pig's dashed line curve. 11 shows the Ladder acceleration in a ladder feed device which the acceleration of the feed motor is not controlled so that a substantially constant conductor acceleration and braking is obtained.

From Pig. 11 it can be seen that during operation of the ladder feed unit 16 the ladder speed first with im

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at a substantially constant rate, after which it increases, however, as it approaches normal operating speed is reduced somewhat. During braking, the ladder speed decrease is except towards the end of the braking portion of the ladder advance cycle is linear.

If only a short length of conductor is fed in during a certain feed step, it is possible to that the feed roller is at its normal constant operating speed is not achieved, but is simply accelerated to a speed below the constant speed, and immediately afterwards decelerates to a stop · The acceleration and that In this case, however, decelerations are approximately constant (cf. FIG. 11), in particular when the speed to be advanced Very short conductor length, e.g. B. 7 cm.

FIG. 9 shows idealized curves of speed V versus time t for the feed roller 42 during the successive feed steps required to produce a conductor bundle according to FIG. 1, the differences (Lc - Lj L. - L ,; etc.) are relatively small and the shortest conductor L _{1 is of} such a length that the feed roller can reach its normal operating speed and maintain it for a considerable time interval. The feed roller only reaches its normal operating speed while the length L ^ is being fed, but in all other feed steps it only accelerates to one

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Speed below normal operating speed and decelerates to a stop. The deceleration part of each curve is slightly steeper than the acceleration part. It is interesting to see that with L ₁ ss approx. 254 cm and the difference (L ₅ - I /. Etc.) in the order of 7.62 cm, the total time required for advancing the bundle is only approx. 2 seconds , whereby the intervals between feed steps are included in this time,

10 shows the frictional relationships between a conductor W _{f of} the feed roller 42, which is subject to the feed, and a pressure roller 58a-e. The pressure roller is pressed against the conductor with a force P _n that can be adjusted as required. The "static friction P_ between the conductor and the rollers depends on P according to the equation

P ₈ - P / u

with / U = coefficient of friction.

The uppermost acceleration limit when advancing a specific conductor is the highest degree of acceleration at which there is no slippage between the conductor and the feed roller 42 occurs, and the magnitude of this degree of acceleration is directly dependent on the static friction force P.

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While it may appear that F _{5 can be raised} to any desired level by increasing the normal force F, there is an upper limit on P _n since the conductor will experience permanent deformation if F is increased excessively. Even if only elastic deformation of the conductor occurs, a revolution error of the rotary encoder 170 due to the deformation of the conductor cross section may be introduced.

To a certain length of ladder within the smallest possible To advance time, the acceleration of the feed roller 42 should be a maximum practical acceleration value must be set, taking into account the friction and the force the above considerations.

In the case of a conductor bundle represented by the illustrated in FIG. 8A Steps to establish, none of the conductor ends of the conductors W6-W10 of the bundle are connected to each other aligned, as is the case according to FIG. According to Fig. 8A, the device is programmed so that the Head can be advanced in seven separate feed steps. A ladder W7 is aligned with one other conductor W6 of the bundle, but is spaced therefrom.

One advantage of the device is that the feed roller 42 meters the conductor material. It could to measure the length of the advanced ladder with

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with each pinch roller 58a-58e or with each conductor a separate rotary encoder could be provided, but this would add to the cost of the facility get high.

Claims;

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Claims (8)

Claims 1V ladder feed device, with one around its axis rotatable feed roller, with a motor that drives the feed roller around its axis, with a motor that drives the feed roller around the axis of the feed roller parallel axis rotatable pressure roller, and with a control unit for incremental movement the pressure roller between a first conductor feed position adjacent to the feed roller and a second, from the feed roller remote position in which no conductor feed takes place, according to a predetermined Ladder feed program, marked by further pressure rollers (58a-58e) cooperating with the same feed roller (42), the control unit (20) is designed so that the pinch rollers (50a-58e) are selectively between their first and their second positions are movable and the feed roller (42) is driven and stopped, whereby the according to the ladder feed program the conductor lengths to be advanced can be determined. 2. Device according to claim 1, characterized in that the control unit (20) members (166, 142) for counting the number of revolutions of the ladder feed roller (42) and for controlling the motor (18) according to the count reached by the counter (142). 7090 n / 0768 AKP 3693 - at - 3. Device according to claim 1 or 2, characterized in that the control unit (20) members (108, 122, 146, 150, 154, 160, 166) to accelerate the feed roller (42) from the rest position with essentially constant speed and for the subsequent braking with an essentially constant speed, until the feed roller (42) stops. 4. Device according to claim 1,2 or 3 »characterized in that the feed roller (42) during predetermined Time intervals can be driven to gradually advance several conductors (W1-W5), the ladder during each such time interval can be advanced by the same amount. 5. Device according to one of the preceding claims, characterized in that each pressure roller (58a-58e) between the ends of one on one side of the axis of rotation (60) of the pressure roller pivotable (at 74) on a frame (36) attached arm (62) and on the other side of this axis of rotation (60) with a piston-cylinder unit (7Oa-7Oe) connected by the control unit (20) can be switched on to move the arm (62) about its pivot axis (74). 6. Device according to claim 5, characterized in that the arm (62) has a clamping member (76) on the of the Axis of rotation (60) of the pressure roller (58a-58e) carries the distal side of the pivot axis (64) of the arm (62), wherein the clamping member (76) to press a yourself between the pinch roller (5öa-58e) and the feed roller (42) extending 7098 5 4/078 AMP 36 ^C J5 - »- Ladder (W1-W5) against a ladder guide member (48) in the second position of the pressure roller (58a-58e), in which there is no conductor feed, is used. 7. Device according to claim 5 or 6, characterized .gekiert, that each arm (62) comprises two parallel members, between which a pressure roller (58a-58e) is received is, wherein the arms (62) are mounted on a common pivot axis (74) which extends between two Support plates and the frame (36) extends, wherein the feed roller (42) also between these support plates is attached. 8. Device according to one of the preceding claims, characterized by the feed roller (42) connected downstream Ladder separators (82) and a device (86) connected downstream of them for applying a belt (84) around the Head (W1-W5). 709834/078 *