CH660272A5 - METHOD to recode A SEQUENCE OF DATA BITS IN A SERIES of channel bits. - Google Patents

Description

1

2nd

The invention relates to a device for time control of the rifle flight on a weaving machine with a shooter who works alternately in opposite directions of flight.

A device for monitoring the rifle flight on a weaving machine is known from US Pat. No. 2,586,335, which switches off the drive of the weaving machine if the rifle flight is incorrect, in particular too slow. This device comprises two switches connected in parallel in the control circuit of the drive motor. The first switch is normally closed and opened wildly by a cam disc coupled to the drive of the machine for a certain interval in each cycle of the machine. The second switch is normally open and is actuated by a control pulse generator during normal rifle flight so that it is closed during the opening interval of the first switch so that there is no interruption in the motor current. If the rifle flight is incorrect, the motor control circuit is opened briefly and the drive motor is stopped. The aforementioned control pulse generator comprises a permanent magnet arranged in the contactor and two induction coils offset with respect to one another in the longitudinal direction of the retail path and an electronic circuit connected to these coils.

Furthermore, it is known to measure the instantaneous speed of the shooter at one or more points of the shooter trajectory and to compare it with a setpoint value by means of a contactless electromagnetic rifle scanning device which acts on the parking device of the path machine in the event of a faulty rifle flight an electronic clock device independent of the weaving cycle is supplied (patents in Switzerland No. 389 528, Germany No. 1 535 280, France No. 1 328 649, United Kingdom No. 985 584, USA No. 3 181 573 and in other countries ).

Further devices for monitoring the rifle flight, which serve to secure the weaving machine and the warp threads, are described in Swiss Patents 469,843 and 498,221, in British Patent 1,228,941 and in United States Patent 3,358,717.

These known devices and the like, which are usually referred to as the rifle guard, have the function of automatically stopping the weaving machine or triggering an alarm as soon as the intended temporal relationship between control pulse and clock pulse or between two control pulses is no longer present.

Also known from French patent specification 1,541,187 is a device for checking the end positions of the contactor in the two contactor boxes of a weaving machine, the reference point for the check being given by a specific angular position of the crankshaft. The purpose of this control is to adjust the strength of the marksman's shot so that the shooter comes to the style in his final positions at the desired time. There is only a coincidence display using a glow lamp; a measurement of the shooter's flight time is not intended. With this known device, however, it is possible to control the end points of the rifle flight with regard to synchronism with the drive of the machine and to correct the rifle strike accordingly, although this is not very precise. A control of the free rifle flight is not feasible with this device.

The purpose of the invention is to create a more powerful control device which makes it possible to quantify the free rifle flight in both directions both with regard to the airspeed and with regard to the synchronism with the drive of the machine and to compare the measured values with one another, and consequently it is very different allowed to carry out exact balancing of the free rifle flight.

An exact determination of the average rifle flying speed in either direction is important insofar as it enables the weaving machine to be set in such a way that the average speed of the rifleman becomes the same in all working cycles. Such uniformity of the rifle flight speed is namely one of the prerequisites necessary for the production of a perfect, even fabric.

A complete balancing of the rifle flight also requires an exact detection of the synchronous operation of the rifle relative to the machine of the machine. It is only through such complete symmetrization that it is possible to increase the speed of the machine while the rifle flight speed remains constant and thus to increase the performance of the machine without impairing the lifespan of the striking mechanism and the rifle by excessive shooting. In addition, only such complete symmetrization allows an optimal setting of the gunner's watchman of the weaving machine. The operationally optimal setting of the response of the marksman is important, on the one hand to avoid downtimes due to unnecessary shutdowns of the weaving machine and on the other hand to ensure a safe shutdown in the event of a so-called disaster. If the shooter flight is so slow that the shooter would be caught by the sheet and pressed into the compartment when the loading movement began, the weaving machine had to be switched off in good time. Of course, the guard should have the same sensitivity for the two directions of flight from left to right and from right to left.

A setting of the guardian in this sense, however, presupposes that the spread of the shooter speed for the direction of flight from left to right is practically as large as the spread for the opposite direction of flight. The detection of this scatter requires a particularly high accuracy of the measurement of the speed of the shooter 40 flight.

The control device according to the invention is characterized in that the following parts are provided:

a) a control impulse device, which comprises a first trigger element arranged in the shooter and at least one 45 pairs of control elements, which are mounted along the lane path and cooperate with the trigger element in such a way that each time the first trigger element passes a control element, a control impulse from the latter is produced;

50 b) a clock pulse generator, which comprises a second trigger element which is moved by a closed path each time the shooter is driven by the drive of the weaving machine through a closed path and for each pair of control elements a clock element which is adjustably mounted 35 along the path of the second trigger element and thus interacts with it that when the second trigger element passes the clock element, a clock pulse is generated by it;

c) an electronic timing device, the temporal differences of two pulses that you within a

# »0

gangs of the shooter are fed, evaluates; and d) a selector that includes a function selector to selectively connect either a pair of control members or a control member and a clock member to the timing device in one pass, and

6S comprises a cycle selector in order to be able to interchange the connections from the control organs of a pair to the timing device.

In a preferred embodiment of the device

6602/72

3rd

4th

According to the invention, a device is provided for selectively suppressing the measurement of the time intervals in one or in the other flight direction of the shooter, in order to be able to measure the time intervals for one of the two flight directions alone.

In the following, embodiments of the test device according to the invention and their mode of operation are described, for example, with reference to the drawings.

Fig. 1 shows an embodiment of the test device and the essential parts of a weaving machine with a shooter in a schematic representation.

Fig. 2a shows the output voltages on some of the circuit blocks of Fig. 1,

2b shows the chronological sequence of the control impulses and clock impulse in two successive working cycles and the closing intervals of a gate switch, and

Fig. 3 is a detailed circuit diagram of the electronic circuit of the test device shown in Fig. 1.

FIG. 4 shows another embodiment of the test device, the parts of the weaving machine and the shooter belonging to the drive device not being shown in comparison to FIG. 1, and

FIG. 5 shows a detail of FIG. 4 in an explicit representation. 1 schematically shows the parts of a weaving machine with a shooter 1 that are essential for the interaction with the testing device; The test device shown in the block diagram in this figure comprises an analog time measuring circuit 9 with a selection device 19 and an analog display device 17. Of the parts belonging to or attached to the weaving machine there are also the striking device 2, 3, the track 4 and the clock pulse generator 5 shown. A trigger device 30 with a gate switch 26 is also provided for selectively suppressing the measurement in one flight direction.

A permanent magnet M is installed in the shooter 4; This, together with the induction coils S1 and S2 arranged recessed in the shop track 4, forms a device for generating control pulses (sl) or (s2) depending on the rifle flight, which is briefly called control pulse device. The marksman's flight directions from left to right and from right to left are marked by arrows a and b.

The clock pulse generator 5 consists of an arm 7 which is firmly connected to the drive shaft 8 (crankshaft) of the weaving machine, a permanent magnet P mounted on its free end and a mounting disc 6 which is coaxial with the drive shaft 8 and is stationary but adjustable in its angular position with a close to the Periphery of this disc attached T1 induction coil. As indicated by a broken line, the drive shaft 8 is coupled to the striking device 2, 3 by mechanical links K-K, as is known; normally, a weft insertion takes place with each revolution of the drive shaft 8, alternately from left to right and in the opposite direction. The sequence of all operations on the weaving machine associated with a weft insertion is referred to below as a work cycle. The drive shaft 8 and with it the magnet P make one full revolution in each working cycle.

The timing circuit 9, together with the display device 17, preferably forms a portable structural unit. However, if the display device is designed as a separate structural unit, the optional connection of different display devices is facilitated.

The selector 19 has an input socket B

provided that can be connected via a connecting cable to a connection socket B ', which is arranged on the weaving machine. This makes it possible to establish the connection between the timing circuit 9 on the one hand and the induction coils Tl, Sl and S2 of the clock pulse generator or the control device on the other hand quickly and without the risk of confusing the connections with the aid of the connecting cable.

The timing circuit 9 contains the selector 19 with io switches 16, 16 ', 26 and 27, two input stages 10 and 11 acting as pulse shapers and amplifiers, a timing pulse circuit 12, an integration stage 13, a reset stage 14 and a holding stage 15. The input stage in each case Control pulse 11 (set input) determines the start of the time interval to be measured, while the pulse supplied to input stage 10 (reset input) defines the end of the interval.

The trigger device 30 comprises two trigger coils G 1 and G2. which, like the coil T1, are arranged on the assembly disk 20 and are adjustable in terms of their angular position. Because of the better clarity of the illustration, the disk 6 of the trigger device is shown separately from the disk 6 of the clock generator 5 in FIG. 1; It goes without saying that, depending on the expediency, separate 25 disks or one and the same disk can be provided as a carrier for the coils T1, G1 and G2. Via the trigger switch 16 '. which is mechanically coupled to the function selector 16, one of the trigger coils can be connected to a relay control circuit 28, to the output of which a Re-30 relay 29 is connected. which closes the normally open gate switch 26 when the permanent magnet P passes the respectively connected trigger coil for a predetermined time interval of, for example, 50 milliseconds.

35 The switch 16 serving as a function selector makes it possible to manually connect either the coil T1 of the clock generator 5 or one of the two control coils SI, S2 to the input stage 10. The switch 27, which is operated as a cycle selector and can be operated manually, allows the connections which lead from the control coils S1 and S2 to the input stages 10 and 11 to be interchanged.

2b, the desired time sequence of the pulses (sl) generated by the coils SI, S2 and Tl. (s2) and (tl) explained. The top 45 diagrams 1) and 2) schematically show the Kon'troUimpulse or the clock impulses that occur in two successive working cycles Cl and C2 with the flight directions a and b. The coil Tl of the clock generator is set in such a way that the clock pulse (tl) induced when the magnet 50 P passes does not occur with certainty until the magnet M of the shooter has passed the coils S1 and S2 within one working cycle. The two lower diagrams 3 and 4 show the closing intervals of the gate switch 26 in the form of right-angle pulses 26 in the positions I and II of switches 16 and 16 '; The setting of the trigger coils G 1 and G2 is selected so that the toggle switch in cycle Cl with flight direction a in position] only allows the control pulse (s2) and in position II only the control pulse (sl) to pass, and vice versa in cycle C2 60 with the direction of flight b.

The selection device 19 makes it possible, through the various settings of the function selector 16 and the cycle selector 27, to measure the time intervals between the pulse pairs indicated in the following Table 1.

66 (12/72

5

6

Table 1

Function selector 16

Cycle selector 27

Time interval

position

position

beginning end

I.

a

(s2) (tl)

b

• (si) on

II

a

(s2) (sl)

b

(sl) (s2)

The function of the electronic circuits of the test device shown in FIG. 1 will now be explained with reference to FIGS. 2a and 3, first in the position of the function selector 16 and the cycle selector 27 shown in FIG. 1, see Table 1, Ia , wherein the coil T1 of the clock pulse generator 5 and the coil S2 of the track are connected to the input of the timing circuit 9. In this position, the time interval that passes between a certain position of the drive shaft 8 and the passing of the marksman magnet M at the loading path coil S2 is checked, in other words, the uniformity of the marksman flight when the weaving machine is running. relative to a specific position of the arm 7 of the clock generator 5. For this case, FIG. 2a shows the output signals of the blocks 12, 13 and 15 of FIG. 1 in the form of idealized voltage pulses 12, 13 and 15.

FIG. 3 shows a detailed circuit diagram of the electronic circuit of the time measuring circuit 9 and the display device 17 of FIG. 1. The functional elements contained in the individual blocks 10 to 14 are designated as follows: D = differentiating element; ! NV = inverter; FF = RS flip-flop; EF = emitter follower; Ml = Miller integrator; MMV = monosta bile multivibrator. In Fig. 3, the voltage pulses occurring at the input and output of the individual stages are also shown schematically; the dotted line represents the zero potential. For the representation of the resistors, capacitors, diodes, PNP transistors and NPN transistors, the symbols according to IEC standards (International Electrotechnical Committee) are used in this figure, so that a more detailed description of the details of the circuit is unnecessary. In addition, each germanium diode is identified by the symbol Ge, and each silicon diode by the symbol Si.

A voting indicator tube, for example of the type EM 84 (Philips), is provided in the display device.

The blocks of FIG. 3 are given the same reference numerals as the corresponding blocks in FIG. 1.

The following processes take place during the measurement process within a work cycle:

The control pulse (s2) coming from S2 and the clock pulse (tl) coming from T1 are converted into negative short pulses with a rapid increase in the input stages 10 and 11, respectively. The RS flip-flop 12 processes these pulses into a negative rectangular pulse (12), FIGS. 2a and 3, the duration t of which is equal to the time interval between the short pulses mentioned. In the integration stage 13, the rectangular pulse delivered by the RS flip-flop 12 is converted into a positive sawtooth pulse, the amplitude of which corresponds to the duration t of the rectangular pulse, and inverted to a negative sawtooth pulse 13. This sawtooth pulse 13 is fed to the first input of the holding stage 15. The input of the reset stage 14 is connected to a second output of the RS flip-flop 12, which supplies a positive going rectangular pulse of the duration, the leading edge of which coincides with that of the transformed control pulse (s2). In the reset stage 14, this positive going rectangular pulse is differentiated and then fed to a monostable multivibrator MMV, which is triggered by the second, negative peak of the differentiated rectangular pulse and a negative rectangular pulse of a certain duration h, for example 30 ms.

delivers. This negative rectangular pulse is differentiated; 'the differentiated rectangular pulse is inverted; the inverted pulse, the second, negative peak of which marks the end of the 30 ms interval, is fed to a second input of holding stage 15. As a result of the negative peak mentioned, the output signal generated in the holding stage by the sawtooth pulse supplied by the integration stage 13 is reset to zero after the 30 milliseconds; there is a negative output signal 15, which, as shown in FIG. 2a, consists of a linearly rising front flank of the duration t, a roof of constant height of the duration h 15 and a steeply falling trailing flank. The total duration of this signal is t + h; its amplitude corresponds to the time interval t between the control pulse (s2) and the clock pulse (tl) in an analog representation.

In addition, the output signal of the reset stage 14 20 is fed to a second input of the integration stage 13, whereby this is always reset exactly to zero after the 30 ms interval has elapsed.

The output signal 15 of the holding stage is fed to the analog display device 17, which, as already mentioned, is provided, for example, with a voting indicator tube. The resulting light field has a length L which corresponds to the amplitude of the output signal (15) and thus to the time interval t between the pulses (s2) and (tl).

The mode of operation of the time measuring circuit when feeding the 30 other pulse pairs specified in Table 1 is corresponding to that described above for the pulse pair (s2), - (t 1).

If a pointer instrument of sufficiently large inertia is used instead of the display device 17 with a tuning indicator tube, the output signals of the timing circuit 9, that is to say averaging over time, can be integrated.

4 and 5, it is assumed that a conventional so-called rifle guard is provided on the weaving machine, which, in addition to other parts not shown, includes a clock pulse generator 5, four induction coils assigned to one another in pairs and attached to the loading track 4 Kl, K2, NI, N2 and a guard circuit 18 includes. For the sake of clarity, the other parts belonging to the weaving machine, which can be seen in FIG. 1, are omitted here, as are the electrical and mechanical components of the gunner's guard serving to shut down the weaving machine.

The device shown in FIG. 4 differs 50 from the one shown in FIG. 1 in that the timing circuit 9 and the display device 25 operate digitally and can also handle a more extensive test program.

In the clock pulse generator 5 of FIG. 4, the parts 6, 7, P, which are not shown in FIG. 4, 55 are designed accordingly, as is indicated in connection with FIG. 1. However, in the embodiment shown in FIG. 4, instead of the one induction coil T1 of FIG. 1, three coils T2, T3 and R which are adjustable in the circumferential direction are arranged on the disk 6. The coil R generates a pulse (r) at the start of the stroke, which is used in a manner to be described as a reset pulse for the timing circuit 9, while the coils T2 and T3 deliver clock pulses (t2) and (t3), respectively.

The timing circuit 9 comprises a selector 19 to be described in more detail, see also FIG. 5, with inputs for the clock pulses mentioned and for control pulses (kl), (k2), (nl) and (n2) which are generated by the coils K1, K2 , NI, N2

6602/72

generated when the magnet M (Fig. 1) of the shooter passes these coils. The guard circuit 18 includes pulse shapers so that it provides well-defined control pulses and clock pulses.

4, the pulse pairs selected by means of the selection device 19 control a gate circuit 23 with two control inputs, the first pulse arriving opening the gate circuit and the second pulse blocking the gate circuit again. During the opening intervals, counting pulses generated by a counting pulse generator 22, which are fed to a third input of the gate circuit, can pass through them and reach a counter 24, which counts and stores the pulses.

The count pulse generator 22 can expediently deliver a pulse frequency of 1000 Hz, so that the time interval between two successive count pulses is 1 ms. At the end of each working cycle, the counter 24 is set to zero by the reset pulse (r) from the coil R already mentioned. A decimal indicator 25, which works, for example, in three digits, is connected to the counter, and the time intervals between two successive clock and control pulses can be read off in decimal numbers.

FIG. 5 shows an embodiment of the selection device 19 shown in FIG. 4; this comprises a cycle selector 20, a function selector 21 and a gate switch 26. A corresponding trigger device 30, as in FIG. 1, which acts on the gate switch 26 can be provided. For the sake of clarity, these voters are shown as mechanical switches; in practice, an electronic circuit is preferably used as the selection device.

The cycle selector 20 has six inputs, to which the control pulses (nl), (n2), (kl), (k2), and the clock pulses (t2), (t3) are fed. In the drawn position of the switch, it is open so that no impulses can pass through. If the switching arms are in the upper position according to a, only the cycle is measured which corresponds to the direction of flight a from left to right; in the lower position of the switching arms according to b, only the cycle with the direction of flight b is measured.

The radio selector 21 has three switch positions 1, 11 and III. In the position shown, the switching arm is in switching position I,

The gate switch 26 is operated in the manner described in connection with FIGS. 1-3.

Depending on the manual setting of the function selector 21 and the cycle selector 20, the time intervals shown in the following table 2 can be recorded by the test device.

Table 2

Function selector 21

Cycle selector 20

Time interval

position

position

Beginning

Late 55

I.

a

(kl)

(k2)

b

(k2)

(kl)

II

a

(n2)

(t2)

b

(nl)

(t2) 60

III

a

(k2)

(t3)

b

(kl)

(t3)

The two measurements in position I, which can be carried out with the help of the cycle selector 20, serve to measure the rifle speed and to test the uniformity and symmetry of the rifle flight in both directions. It is thus possible to check whether the shooter has a constant average speed in one of the directions a or b between the coils K1 and K2, and further whether the average speeds are the same in both directions. If there is no such symmetry, this test enables the impact device 2, 3 to be set in this way, see FIG. 1, and their drive elements,

that the desired symmetry arises.

In position II the uniformity of the rifle flight can be checked in relation to a certain position of the drive shaft. For this purpose, the coil T2 is set, for example, in such a way that the pulse (t2) generated by this coil arrives for a certain time, assumed approximately 5 ms, after the pulse (nl) generated by the coil N1 of the loading track. An observation over several working cycles of the 15 flight direction b in this position shows whether there is uniformity between the individual shots in the direction b, that is to say whether the observed time intervals lie within certain limits, for example 4 ms and 6 ms. Now switch the coil using the cycle selector 20

20 N2 instead of the coil Nl, a check of the rifle flight can be carried out in the opposite direction a. If the measured time intervals are not within the prescribed range of 4 to 6 ms, the drive elements of the impact meter can be adjusted accordingly.

21 mechanism of the weaving machine the deviation can be corrected. Such a correction, i.e. a comparison of the time intervals in the two directions a and b, is a prerequisite for ensuring that the rifle guard has practically the same sensitivity in both directions of flight

30, which means that it responds with the same large change in rifle flight speed.

Position III enables control of the shooting process of the rifle guard in the so-called catastrophe, that is, in the event that unacceptable delays in rifle flight occur in the last part of the rifle track along loading path 4, which are caused by "rifle strike" to destroy parts the ark could lead. This case can no longer be detected and secured using the coils NI, N2. Timely braking, 40 which could completely prevent the drawer from impacting, is no longer possible at this late point in time. In the event of a disaster, however, the rifle guard still interrupts the positive drive of the drawer and actuates the braking device, so that the Vade can only strike the rifle as a result of its inertia, whereby the force of the impact is reduced. The time control process takes place in a manner analogous to that in position II of the function selector 21, but instead of the induction coils NI, N2 and T2, in position III the coils K1, K2 and T3, which pulses (k1), (k2) and ( t3) deliver, to the effect