FR2625515A1 - JACQUARD MECHANICS WITH ELECTROMAGNETIC CONTROL OF THE SELECTION OF THE DECKS, PARTICULARLY FOR A WEAVING - Google Patents

Abstract

Jacquard machine with electromagnetic control for the selection of the plates, characterized in that each electromagnet 6 is, on the one hand, connected to a first control circuit 11 by a switch 12 controlled according to the drawing by the logic level and that , on the other hand, each electromagnet 6 is connected, by group, to a second control circuit 22 by a switch 24, with a first switching stage 25 for the addition of an overexcitation voltage, with a second switching stage 26 for adding the excitation due to the rated current, with a third switching stage 27 for adding the de-excitation voltage, with a fourth switching stage 28 for adding the counter voltage -excitation, the switch 12 being connected, for the addition of the switching stages 25 to 28, to a pulse emitter 31 mounted on the main shaft 30 and, for switching off the fourth switching stage 28, to a timing device 33 and each first control circuit 11 being mounted in series with the second control circuit 22.

Description

The present invention relates to a Jacquard machine with control

  electromagnetic selection of the decks for a textile machine like, for example,

  a hosiery machine, a knitting machine, in particular

  a knitting loom. This machine comprises, for each plate, at least one electromagnet which can be

  controlled by the design and which, during the training cycle

  step, carries out with the lifting elements a lifting and lowering movement and, in a selection position according to the drawing, can carry out or

  break an adhesion bond with the plate.

  WP D 03 C / 279604 describes a control device according to the design in textile machines, in which control magnets grouped in magnet blocks are raised and lowered with usual lifting elements. In a position of selection by step, the control magnets are excited by an electronic control system according to the drawing by means of an electronic power system and therefore realize, according to the drawing, with the corresponding plates, bond of adhesion which makes that they bring these plates in a pbsition corresponding to the drawing in the high or low step. The return movement can be carried out by

  adaptation of the forms or by forced training.

  For the transmission of large amounts of data which are necessary in particular for the control of weaving machines which operate at high speed and in which, therefore, the blocks containing the control magnets only remain in a selection position for a short time. , the control devices of the type in question require fast and expensive computers. However, moreover, the regulating members must meet requirements

  particular with regard to yield and consumption

  energy. DE-OS-1 804 249 indicates that it is possible to increase the time available for selection

26 2 5 5 1 5

  following the drawing using a Jacquard machine comprising two groups of plates and, for each, a group of electromagnets. In this device comprising two groups of plates and two groups of control magnets, the first group of plates is first subjected to the movement of selection of the first group of control magnets at the same time as the second group of plates is subjected to the lifting movement of the cutter holder and, conversely, on the other hand the second group of plates is subjected to the movement of

  selection of the control magnets from the second group of

  command mantles together with the first group of

  plates is subjected to the lifting movement of the holder

  cutter. Due to the double movement of the control magnets and their approach, the consumption of material and the frequency of walking incidents increase significantly. The object of the invention is to improve the efficiency of the electromagnetic control device of the plates

  while simplifying the device and reducing the frequency

  of walking incidents and energy consumption.

  The object of the invention is to increase the time available

  for the selection of control magnets.

  This object is achieved, according to the invention, because, on the one hand, each electromagnet is connected to a first control circuit by a switch controlled according to the drawing, by a logic level. On the other hand, each electromagnet is connected, by group, to a second control circuit by a switch, by a first switching stage for adding an overexcitation voltage, by a second switching stage for the addition of the excitation due to the nominal current, by a third stage

  switch for adding the de-energizing voltage

  tion, and by a fourth switching stage for the ad-

  addition of the counter-excitation voltage.

  This switching device is connected, for the ad-

  edition of the switching stages, to a pulse transmitter

  sions mounted on the main shaft and, for switching off the fourth switching stage, to a timing device. Each first control circuit is

  switched with a second control circuit in series.

  This staggering, by stages of control operations

  following the drawing allows to obtain not only a sim-

  folding and greater safety on the move, but also a certain autonomy in weaving operations

  and therefore an extension of the possibilities of use

  reading of the drawing, for example due to the possibility of going back. As the control according to the drawing of the first control circuits of the electromagnets can

  be performed without synchronization with the fabric operations

  wise themselves, it is possible to introduce or incorporate

  pore additional information in the drawing and the intermediate insertion states have no effect on the adjusting member. It therefore becomes possible to optimally model the operating intervals for the power of the control magnets. In one embodiment of the invention, each electromagnet is connected, on the one hand, to a first control circuit by a parallel mounting of a switch and a diode

  and, on the other hand, to a second control circuit consisting

  moved by the switch, by its pulse transmitter

and by the timing body.

  Various other features of the invention res-

  emerge from the detailed description which follows.

  An embodiment of the subject of the invention

  is shown, by way of nonlimiting example, above

sin annexed.

  Fig. 1 is a block diagram of a Jacquard machine of a loom operating according to the

principle of 3 positions.

  Fig. 2 shows the circuit diagram for

order magnets.

  Fig. 3 shows a control location

  of the magnet control device.

  In the Jacquard machine represented by fig. 1 and incorporated into a weaving loom operating according to

  the principle of the 3 positions, the wires 1 to be ordered not-

  feels in the eyelets 2 of the plates 3. An upper magnet block 4 and a lower magnet block 5 each comprising an electromagnet 6 which can be controlled according to

  the invention perform in a known manner and therefore

  quent, not shown, with lifting elements, at the rate of the formation of the steps, movements up and down. Each of the magnet blocks 4 or 5 is associated with elements of suitable shape 7 or 8 which bring the plates 3 back to their selection position represented in part A of FIG. 1 (see DD WP D 03 C / 279 604 In the selection position, a stop device 9 engages in the stop zone 10 of the plates 3. After the electromagnets 6 are actuated

  according to the invention under the conditions which will be indicated

  quées subsequently with reference to Figures 2 and 3,

  the excited electromagnets create a bond of adhesion

  rence with the plates 3 and bring them, by a drive

  forced, in the indicated high or low positions

  in part B of figure 1. The plates 3 not trans-

  ranges remain stationary in the selection position.

  The return of the plates 3 to the selection position is eff-

  perform from the high step position with the ele-

  elements of adapted form 7 and from the position of low step with the elements of adapted form 8 (see DD WP D 03 C / 279 604). For the control according to the drawing, each electromagnet 6 is connected on the one hand to a first control circuit 11. This control circuit 11 is constituted by a parallel mounting of a switch 12 and a -5 diode 13 (Figure 2). The switching device 12 consists of a transistor 14 (FIG. 3), the base of which is controlled, by means of a resistor 15, by a flip-flop 16. The flip-flop 16 can, according to the drawing, be of a known manner and therefore not shown

  smelled, positioned and removed by a

  microcomputer control, for example by means of several flip-flops constituting a register of movements or of command by addresses. The collector of transistor 14 is

  connected to one of the pins 17 of the electromagnet 6. The two

  x pole 18 of each electromagnet 6 of a group

  of magnets 19 to 21 is connected to a second communication circuit

  command 22. In this control circuit 22, the collecting pipe 23 is connected to the switch 24. This switching device comprises several switching stages, in this case 4 corresponding to references 25 to 28, for

  addition of supply voltages for electro-

  magnets of the groups of electromagnets 19 to 21 selected via the first control circuit 11 by the switches 12 controlled by the rocker 16. For this, all the switching stages 25 to 28 of the switching device 24 are connected to the collector pipe

  23. The switching stage 27 is connected, via

  diary of the connecting pipes 29, to all the first circuits 11 of all the groups of electromagnets 19,, 21. The switching device 24, which is preferably a voltage-controlled efficiency amplifier, applies to the first stage switching 25 the overexcitation voltage with which the electromagnets attract the plates 3. As a result, the circuit subjected to the voltage + U1 comes into action via the switching stage 25, the collecting pipe 23, the pole 18, the electromagnet 6, the switching device 12 and the connecting pipe 29. The closed position of the switching devices of the switching stages 25,

  26, 27, 28 is affected by the fact that the impulse transmitter

  sions 31 mounted on the main shaft of the weaving loom emits, at the contacts 31a to 31d, a position signal which is transmitted by the pipe 32 to the switching device 24 which is modified. Switching stage 28 is switched off by a timing device 33 to which the position signal from the pulse transmitter 31 is also transmitted by input 34. As a result, the second stage of switching 26 applies the excitation voltage ensuring the maintenance of the nominal current necessary for transport by drive

  forced plates 3 in the upper or lower step.

  The current circuit subjected to the voltage + U2 comes into action through the switching stage 26, the pipe

  collector 23, pole 18, electromagnet 6, commu-

  closed guard 12 and the connecting pipe 29. At the moment when the plates 3 begin to return from the position of high or low step with the elements of suitable shape 7 or 8 (FIG. 1) of the blocks of magnets 4 or 5 up to at the selection position (also applicable in the case of return under the conditions indicated by WP DD D 03 C / 249 604, FIG. 5), the pulse transmitter 31 closes the switching stage 27 and, as a result done, the excitation circuit, until the current is removed. As a result, the current circuit of the electromagnet 6, of the closed switch 12, of the connecting pipe 29, of the switching stage 27, with the supply voltage 0, of the

  manifold 23 and pole 18 comes into action.

  The return of the plates 3 to the starting position involves the remanence force. When the arousal

  removed the current at the switching device

  tion 12, a microcomputer control device can,

  before the magnet blocks 4, 5 have reached the posi-

  selection, put back into action according to the drawing? the switch 12 with a logic level, in a known manner and therefore not shown, so that this switch 12 is closed. If the magnet blocks 4, 5 have reached the selection position (fig. 1, part A), the fourth switching stage 28

of switch 24 is closed.

  Under these conditions, the circuit which is subjected to the counter-excitation voltage - U3 comes into action by the connecting pipe 29, the diode 13 (the transistor 14 is closed in this direction in this direction), the p8le 17, the electromagnet 6, the collecting pipe 23 and the switching stage-28. The elimination of the remanence in the switching position 28 ensures the separation of the plates 3 from the electromagnets 6. At the end of

  the time interval corresponding to the chronological organ

  graph 33, the switch 24 is brought into the switching position 27 where it remains until the start of a new cycle.

Claims (2)

  1 - Jacquard machine with electromagnetic control of the selection of the plates, in particular for a weaving loom comprising, for each plate, at least one electromagnet which can be controlled according to the drawing and which, during the step formation cycle, performs   with the lifting elements a lifting movement   vement and lowering -and, in at least one selection position according to the drawing, can make or break a bond of adhesion with the plate, characterized in that each electromagnet (6) is, on the one hand , connected to a first control circuit (ll) by a switch (12) controlled according to the drawing by the logic level and that, on the other hand, each electromagnet (6) is connected, by group, to a second control circuit (22) by a switch (24), with a first stage of   switching (25) for adding an overexcitation voltage   tation, with a second switching stage (26) for adding the excitation due to the nominal current, with a third switching stage (27) for adding the   de-excitation voltage, with a fourth stage of com-   mutation (28) for the addition of the counter voltage   excitation, the switch (12) being connected, for the addi-   tion of the switching stages (25 to 28), to a pulse transmitter (31) mounted on the main shaft (30) and, for switching off the fourth switching stage (28), to a timing device (33) and each first control circuit (11) being connected in series with the second control circuit (22).   2 - Jacquard machine according to claim 1, charac-   terized in that each electromagnet (6) is connected, on the one hand, to a first control circuit (11) by a parallel mounting of a switch (14) and a diode (13) and, on the other hand, to a second control circuit (22) constituted by the switch (24), by its pulse transmitter (31) and by the timing (33).