CS195851B1 - Apparatus for unifying time constants of fibrous material supply,or return mechanisms,and yarn take-off and winding mechanisms in open-end spinning machines for processing staple fibres - Google Patents

Abstract

Device is provided for synchronisation of the time constants of means for supplying yarns and rearward feeding, drawing and winding of yarns in open-end spinning rotor machines having a number of spinning units each of which has an individual set of the means controlled by a common program. Each spinning unit has a control circuit which is controlled by the common program. Each circuit has an operative element which is preceded by a settable element which determines the rate of transition of the element from its rest position to its operative position and vice versa. Yarn breaks can be eliminated in individual units using a common machine program.

Description

SUMMARY OF THE INVENTION The present invention relates to a device for unifying time constants of material feed or return and yarn withdrawal and take-up machines in open-end spinning machines of staple materials provided with a plurality of spinning units including material feed, yarn return and withdrawal devices; winding of yarns whose non-stationary processes are controlled by a program common to the whole machine.

The new generation of open-end spinning machines keeps from the older generation the basic concept, characterized inter alia by the fact that the machine consists of a number of spinning units placed side by side. On the other hand, automation, which is the hallmark of a purely new generation of these machines, places extremely demanding requirements on all units in terms of the appropriate behavior of the individual bodies of each working unit. Among the automated machines, for example, devices are known from patent literature. which controls the function of the individual spinning stations in a non-stationary process, either by a common central program or by a common bypass device.

It is known, for example, to control the spinning machine according to AO 168 224, where, after detecting an unsteady state of the workstation, the signal of its registration means is routed to the workstation status monitor, on the one hand, to the program transmitter which is activated, then the program signal to remove the unsteady state is passed through the followers to executive means which removes the cause of the unsteady state, the final signal of the program transmitter actuating the follower and stopping the program transmitter.

Another known solution is the apparatus of AO 173 768, wherein each workstation is connectively coupled to a control program system and a coincidence circuit coupled to a sensor to connect the workstation to the control program system when the sensor detects an unsteady state.

Another known device of a different type according to French Patent No. 2 240 969 operates by using a centrally driven taxiing piecing unit that moves to a stationary state where the rotor speed is reduced, spinning occurs and the speed is increased again. until the operating conditions are reached when a normal yarn spinning process occurs.

In all these cases, there are extremely stringent requirements to ensure that all jobs behave in the same way in terms of time constants. This requirement is all the harder because, due to the high working speeds of these machines, the fields of permissible variations of these time parameters are very tight, in the order of tens of milliseconds at the most. Compliance with these requirements means greatly tightening the requirements for the accuracy of production and the quality of the material used, which in turn means an increase in the production cost of the machine. In particular, it is a mechanism for feeding the material, for returning the yarn and for withdrawing the yarn winding.

It is an object of the present invention to provide an inexpensive and reliable unification of the time constants of the material feed or yarn return mechanism and / or the yarn withdrawal mechanism of an open-end spinning machine with multiple spinning units whose non-stationary processes, e.g. common to the whole machine.

The principle of the invention consists in that for each spinning station, an adjustable element for adjusting the rate of change from the idle state of said executive element to the working state and vice versa is inserted in front of the at least one executive organ into its circuit controlled by the central program.

To illustrate the invention, an exemplary embodiment of a spinning station shown in the drawing is shown schematically in sectional view and in sectional view of two work stations I and II and at each location one of the executive bodies, in this case an electromagnetic clutch, e.g. the circuits for feeding the fibrous material are still intermittently indicated.

In the body 1 of the spinning unit are placed the feed rollers 2 for the sliver of fibers 3. Furthermore, in the cavity of the body 1 there is an opening element 4 which extends into the transport channel 5. The channel 5 is formed in the body 1. The spinning rotor 6 passes into a hollow exhaust tube 12, at the end of which a pulley 10 is mounted on the outside of the shoulder, which is driven by a traction drive. The belt drive, as well as the drives of the combing organ, are not illustrated or described in detail, since they are sufficiently known from the patent literature and are also not essential to the invention. In the yarn path 17 there is installed a sensor 13, take-off rollers 14, a winding roller 15 with a bobbin 16.

A sensor 22 is connected to the sensor 13, to which an adjustable element 23 is connected. The signal 20 is led to the individual devices from the program transmitter 21.

The device works as follows:

The strand of fibers 3 is fed by the feed rollers 2 to the opener 4, where it is opened in parallel. For this, the surface of the opener 4 is provided with a suitable coating. From the surface of the opener 4, the fibers are scanned both by centrifugal force and by a stream of air supplied from the atmosphere and carried by the transport channel 5 to the spinning rotor 6. Here they are deposited from the so-called collecting surface in ribbon. twists. The yarn 17 is withdrawn from the rotor 6 by the take-off tube 12 through the sensor 13 by the take-off rollers 14 and guided through the take-up roller and wound on a bobbin 16.

The sensor 13 monitors its operating state at each spinning station I, II. If there is a rupture at this point, the yarn voltage drops 17, the contact closes and the sensor sends a pulse to the control element 18 which, via a gate 19, opens the signal path 20 at a specified time. The function of the executive body 22 can be performed, for example, by an electromagnetic clutch or, in another embodiment, a hydraulically operated clutch.

Since these executive bodies 22 have different manufacturing tolerances from each other, each of them could react at a different rate so that the common program signal, i.e. the signal 20, could hardly be used. Therefore, each executive authority has an adjustable element 23 in front of the executive authority 22 in its control circuit of the joint program, by which the rate of change from the idle state of the executive authority 22 to its operational state or vice versa can be adjusted.

Adjustable element 23, by adjustment of which it is possible to ensure that the combination of the actuating element 22 and the adjustable element 23 at each location ensures that the corresponding operation controlled by the signal 20 is such that the operation proceeds equally in time. The adjustable element 23 may comprise, for example, an adjustable ohmic resistor (see FIG. 1) or, alternatively, an adjustable hydraulic throttle.

The adjustable element 23 is adjusted so that the resulting time constants of each work station correspond to the behavior of the worst-spinning station. In other words, the parameters of all jobs are close to those of the worst unit. However, this is not a problem, since the corresponding correction is then made in the central program, i.e. the signal 20 is moved forward by the necessary time interval. In this way, the time constants of the fiber feeding, yarn returning and yarn withdrawing and winding devices can be unified in a simple way, either individually or in all.

SUBJECT

Claims (1)

Apparatus for unifying the time constants of the material feed or return and yarn withdrawal and take-up machines in open-end spinning machines of staple materials, equipped with a plurality of spinning units including material feed, yarn return and yarn withdrawal and winding machines, non-stationary processes are controlled by a common program OF THE INVENTION for the whole machine, characterized in that for each spinning station a central element (22, 22 ') is inserted in front of at least one executive member (22, 22') into its circuit controlled by the central program organ (22, 22 ') to the working state and vice versa.