JPH0362118B2 - - Google Patents

Description

Detailed Description of the Invention Technical Field The present invention relates to an upper shaft that can be driven via an electric drive, a position signal generator disposed on the upper shaft, and an electric drive that depends on the position signal generator. The present invention relates to an industrial sewing machine having an adjustment and control device for controlling the control device, an operation and display device, and an interface device that connects the adjustment and control device, the operation and display device, and other components.

PRIOR ART An industrial sewing machine or an electronic positioning device of this type is known from DE 29 38 040 A1.

In this known device, an external operating element is connected via a parallel connection, which responds by controlling the drive. Operation/display device and adjustment/
This connection to the control device does not allow signal transmission between the operating and display device and the regulating and control device and other external components to be carried out properly under all conditions of use. This is because electronic components in the vicinity of the sewing machine are disturbed, for example by switching relays or magnets and by the resulting electromagnetic fields.

Purpose An object of the present invention is to configure a sewing machine so that various peripheral devices can be connected, and to prevent these peripheral devices from interfering with signal transmission of other peripheral devices when the various peripheral devices are connected. It is to be.

Configuration In order to achieve the above-mentioned object, the present invention provides two conducting wires for each of the outgoing path and the incoming path in order to transmit signals back and forth from interface to interface between n components. ,n
the output of each of the n components has a drive stage with a device for inverting the signal to be transmitted, and a transmitting or receiving device is connected to the input or output of each of the n components; The individual components are connected to each other via a data bus for transmission and
The receiving device is individually digitized, so that the individual components are individually digitized via the transmitting or receiving device connected to the microprocessor and via the code generated by the microprocessor of the regulating and controlling device. controllable, or the response of each component can be detected individually, splitting the signal to be transmitted into an uninverted signal and an inverted signal, and transmitting both signals via separate conductors. The method is characterized in that the two signals are combined on the receiving side so that the difference between the two signals exceeds a predetermined threshold value and an output signal is generated.

Effects With this type of interface device (which can correspond to the known document RS422, for example),
Interference with the signal transmission can be effectively prevented without the use of additional filters, such as eg RC networks. The sequence of information transmission proposed by the arrangement according to the invention reduces the amount of conductors used and makes it possible to connect individual devices, e.g. operating devices, control devices, test devices, storage devices, etc. to just one data bus. This allows the entire device to be modified and adapted to personal preferences. Additionally, data can be processed efficiently because unresponsive components can be automatically disconnected and perform their unique functions in parallel in time while disconnected from the rest of the device. Furthermore, by distributing the functional commands to a plurality of components or storing them in multiple ways, the effect of preventing signal interference can be improved.

According to the arrangement according to the invention, the signal to be transmitted is divided symmetrically into a standard signal and an inverted signal, and these signals are transmitted via separate conductors. On the receiving side, the signals are related in such a way that the difference between the two signals exceeds a predetermined threshold value and produces an output signal.

The transmission technology used in the industrial sewing machine according to the invention is fundamentally different from previous attempts to prevent signal interference by the sewing machine or its associated controls and drives. Conventionally, the individual components themselves were configured to cause as little signal interference as possible, and the completed sewing machine or drive was correspondingly tested using classical testing methods that were susceptible to interference, i.e. It was ensured that no interference was caused by individual countermeasures.

However, this traditional procedure has been hampered by the fact that the electronic components of industrial sewing machines have become increasingly complex these days, making it difficult to test for possible interference effects; No consideration is given to the provision of additional equipment that may be modified as necessary or not considered in the manufacturer's approach to interference removal.

Furthermore, it is advantageous for each of the n components to be associated at its input or output with a transmitting or receiving device for transmitting or receiving a coded signal for a particular component. This configuration allows all components to be connected to one common data bus, thereby eliminating the need for each component to transmit signals in parallel and allowing the device to be configured arbitrarily without hardware changes. Can be expanded and adapted.

Embodiments Next, embodiments of the present invention will be described with reference to the accompanying drawings.

The industrial sewing machine 1 shown diagrammatically in FIG. 1 is driven by a positioning drive 2 via a belt drive 3. The industrial sewing machine 1 shown schematically in FIG. A position signal transmitter 5 is arranged on the upper shaft 4 of the sewing machine 1 shown diagrammatically. needle 6
A sensor in the form of a light interrupter 7 is provided in the front sewing area.

The positioning drive device 2 or the sewing machine 1 has adjustment and
A control device 8 is attached. Adjustment/control device 8
The operation or control is performed via the operation/display device 9.

The operating and display device 9 has a display 10 , a light emitting diode device 11 and an input keyboard 12 . The display 10, the light emitting diode device 11 and the input keyboard 12 are connected to data conductors 13,
It is coupled to a microprocessor 15 via 14. A transmitting or receiving device 18 is arranged between the microprocessor 15 and the output 16 or input 17.

A transmitting/receiving device 21 and a microprocessor 22 are likewise arranged behind the output 19 or input 20 of the regulating and controlling device 8. An output stage 24 is arranged between the microprocessor 22 and the output 23, via which the sewing machine 1 or the positioning drive 2 is controlled by a conductor 25.

FIG. 2 diagrammatically shows the area in front of the output 16 or input 17 of the operating and display device 9, omitting components that are not important for the following explanation. In front of the output 16 is the signal to be transmitted.
A drive stage is arranged with a device for reversing the 01. Behind the input 17, there is a difference forming device 27 (for example,
(including SN75175) are located.

An input 20 of the regulating and controlling device 8 is connected to the output 16, and an input 17 of the operating and display device is connected to the output 19 of the regulating and controlling device 8. In parallel to the input 20 or the output 19 of the regulating and controlling device, a further sewing machine 28 can be connected, for example as an n-th component, operating in dependence on the sewing machine 1 (see FIG. 4).

A resistor R _x is arranged between the conductor wires 34, 35 or 36, 37 carrying the signal LA or LB and the signal LA' or LB', respectively. this resistor
R _x (for example 1 kΩ) is used to adjust the threshold value S _LA or S _LB that contributes to the formation of the output signal I.

FIG. 3 is an explanatory diagram of signal formation and its transmission.

The output signal 0n of the nth component, e.g. the output signal 01 of the operating and display device 9, is inverted by the drive stage 26 (e.g. comprising an SN75174), the signal LB.
Alternatively, the signal LA is divided into non-inverted signals LA and transmitted. After transmission, the signal type LA or
LB occurs. These transmitted signals LA or
From LB, the difference forming device 27 receives the output signal In of the nth component, for example the output signal I of the regulating and controlling device 8.
form 2. The interference component is removed depending on the height of the threshold value S _LA or S _LB which is adjusted via the resistor R _x . Such a transmission technique ensures a reliable separation of the signal and interference noise and therefore makes the transmission of the signal very reliable.

FIG. 4 shows how the individual components can be connected via one common data bus 29. FIG. In this case, a transmitting/receiving device 30 is attached to each component. These transmitting/receiving devices are the aforementioned transmitting/receiving devices 18, 21.
It corresponds to Components of this type include the sewing machine 1, the operation/display device 9, the light interrupter 7, the adjustment/control device 8, the sewing machine 28 that operates depending on the sewing machine 1, as well as the tester device 31 and the storage device 32. , modem 33, position signal transmitter 5, etc., pressure, temperature, field (e.g. electromagnetic field)
A sensor 34 such as the following may be considered.

In each case, one coded signal is applied via the data bus 29, so that only the correspondingly coded receiver of the addressed component is activated. Encoding or decoding can be performed by the microprocessors 15, 22 mentioned above or other suitable microprocessors or via known logic circuits.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an industrial sewing machine according to the invention equipped with an external adjustment and control device, an operation and display device;
FIG. 2 shows the signal transmission path between the operating and display device and the component to be controlled by it, FIG. 3 shows the resulting transmitted signals, and FIG. 1 is a layout diagram of various components connected to a common data bus; FIG. 1...Industrial sewing machine, 4...Upper shaft, 26...Drive stage, 34, 35, 36, 37...Conducting wire.

Claims (1)

[Claims] 1. An upper shaft 4 that can be driven via an electric drive unit 2;
A position signal generator 5 disposed on the upper shaft 4, an adjustment and control device 8 that controls the electric drive unit 2 depending on the position signal generator 5, an operation and display device 9, and an adjustment and control device In an industrial sewing machine having a large number of interfaces attached to an operating/display device 8 and other components, in order to transmit signals back and forth from interface to interface between the n components, Two conductors 34, 35 for each outbound and return trip; 3
6, 37, each output of n components 16; 19
has a drive stage 26 with a device for inverting the signal to be transmitted, and has a transmitting or receiving device 18; 21; 30 at the input 17; 20 or output 16; 19 of each of the n components. is connected,
The individual components are connected to each other via a data bus 29 and the transmitter/receiver devices 18; 21; 30 are individually digitized, so that the individual components
individually controllable via a transmitting or receiving device 18; 21; 30 connected to the microprocessor 15 or 22 and via a code generated by the microprocessor 22 of the regulating and controlling device 18; The response of the individual components can be detected individually, and the signal to be transmitted is split into an uninverted signal and an inverted signal, both signals being routed via separate said conductors 34, 35; 36, 37. An industrial sewing machine characterized in that the signals are transmitted and connected on the receiving side so that an output signal is generated when the difference between the two signals exceeds a predetermined threshold.