Textiles: spinning – twisting – and twining – Apparatus and processes – Piecing up
Reexamination Certificate
2000-03-29
2001-11-13
Worrell, Danny (Department: 3741)
Textiles: spinning, twisting, and twining
Apparatus and processes
Piecing up
Reexamination Certificate
active
06314712
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a process and a device for the control of the piecing process in a spinning device, such as an open-end spinning rotor.
It is known from German patent 25 07 199 A1 that the piecing process is controlled through contact-less measurement of the rotational speeds of open-end spinning rotors. The rotors are made with colored markings serving as reflectors. A photoelectric impulse receiver placed at a short distance and emitting a light ray receives the light ray reflected from the marking. In this manner, the momentary rotational speed of the rotor is scanned without contact, and the beginning of the piecing process is initiated as a function of the monitored piecing behavior of the spinning rotor. Impulses proportional to the rotor speed were used for the control of the piecing process, in particular to control fiber feed and yarn draw-off.
Further developments of this technical idea is that the rotor speed in open-end spinning devices is not measured directly, but rather that the speed of the bearing disks of the open-end spinning rotors is measured. In this case, the bearing disks were provided with reflectors for contact-less measurement of the rotational speed. Bearing disks of this type are known, e.g., from German patent 41 21 387 A1. Two reflectors are imbedded in suitable recesses in the surface of one face of the bearing disks. However, the optical measuring of rotational speed no longer provides reliable and clear signals in case of heavy fly from the fiber material to be spun.
This problem was solved by building small magnetic pins into the bearing disks (German patent 43 13 753 A1). In this design of a bearing disk, above all, care must be taken to insure above all that the bearing disks with the built-in magnetic pins should present as flat and smooth a surface as possible, so that neither high points nor low points are formed.
This care applies also to the attachment of reflectors on other bearing disks (German patent 196 20 377 A1). This is generally so because even a small imbalance results in enormous centrifugal forces at the usual rotational speeds, so that the bearing disk may be damaged or even destroyed. Extensive damage of the spinning devices is also unavoidable in that case.
The method of contact-less measurement of the rotor speed is based solely on the principle that a signal emitter transmits an impulse signal to an impulse receiver. As a rule, a frequency measurement or speed measurement of moving parts in the rotor (bearing disks), or of the rotating rotor, are made. If the method for measuring the speed is to be one with reflectors on the bearing disks, the signal emitter is made in the form of a light source. The emitted light is reflected in a pulsating manner as the reflector passes, so that an impulse receiver records the light impulse. If the bearing disks are provided with magnetic pins, it also means that the magnetic pins are designed as signal emitters producing magnetic field lines which produce an induction current in an impulse receiver. In either case, the impulse receiver, in principle, solely records impulses that are proportional to the rotor speed.
For this type of rotational speed measuring, the bearing disks necessarily require especially high fabrication quality. Furthermore, magnetic forces of the magnetic pins may magnetize other materials in the spin box susceptible to magnetization and cause additional interference. Under certain circumstances, the impulse emitter must be positioned precisely for the impulses to be counted by the impulse receiver. In addition, interference may be produced due to the fact that the spinning device is being soiled by fly during the spinning process.
OBJECT AND SUMMARY OF THE INVENTION
It is, therefore, a principal object of the present invention to make it possible to control piecing without changing the structure of the rotor or of the bearing disks at all, e.g. with reflectors or similar devices, and thus to overcome the disadvantages of the state of the art. Additional objects and advantages of the invention will be set forth in part in the following description or may be obvious from the description, or may be learned through practice of the invention.
The problems with the prior art devices are a process for controlling the piecing process in a spinning device, in particular an open-end spinning device with rotors. By the piecing process and/or the rotor speed are detected and/or controlled as a function of physical magnitudes and/or their changes in the spinning device. A device is used to perform the process for controlling the piecing process in a spinning device. The device is a measuring device to determine physical magnitudes or states in the spinning device, which are linked to the control of the piecing process.
The method for the control of the piecing process is inventive in that the spinning process and/or the rotational speed of the rotor are detected and/or controlled as a function of physical magnitudes or states and/or of their change in a spinning device. “Physical magnitude” or “physical state” are generally to be understood as conditions produced by the piecing process in and on the spinning device that can be detected and described. Due to the spinning process being a continuous operation, these conditions as well as the rotor speed change or can be influenced over time. By contrast with the state of the art, no impulse is detected by an impulse receiver, but the physical conditions or the changes in conditions produced by the rotating rotor itself are detected. The piecing process is controlled on the basis of the directly measured states or conditions.
Advantageously, no structural changes are required on the rotor or on the bearing disks. No special design requirements for the rotor or the bearing disks are needed. Nor for the placement and alignment of the components or of the impulse emitters and receivers, since it is possible to eliminate impulse emitter and receivers. This leads to considerable simplification in construction.
According to a further development of the invention, the internal pressure, the sound pressure, the sound frequency and/or the sound level in the spinning device are detected. These physical magnitudes or states are caused or influenced by the rotor speed and/or the piecing process itself. This measuring principle is based on the fact that the dynamics of the rotor are not detected by means of a special impulse emitter and receiver, but rather through the physical magnitudes and states caused by the rotor speed, or their change. Therefore, an immediate correlation exists between the rotor speed and the physical magnitudes and states produced by the rotor rotation.
In a further development of the invention, at least one reference measurement is noted before the piecing process. In this reference measurement, the rotor is accelerated from a stopped position to operating speed so that reference may be obtained on the behavior of the physical magnitudes and states as a function of the rotor speed. Thus, it may very well happen that variations in the behavior of these physical magnitudes and states take place from one spinning device to another, depending on the rotor selected and other parameters. As a result of the reference measuring being carried out, a yarn production specific to a spinning station can be purposefully controlled during piecing.
It is further proposed, that a device for the control of the piecing process be designed with a measuring device provided for the purpose of detecting physical magnitudes or states in the spinning device, whereby the device is connected to the controls of the piecing process. This measuring device distinguishes itself through the fact that it measures physical conditions produced by the rotation of the rotor in the spinning device or changes in those conditions and transmits them to the controls. The physical conditions and states produced by the direct rotation of the rotors or the bearing disks are measured directly by the measuring device
Dority & Manning
Rieter Ingolstadt Spinnereimaschinenbau AG
Worrell Danny
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