draw-wire encoder, also known as Cable pull sensor or Cable displacement sensor, are precise measuring instruments that offer reliable and accurate distance measurement through a simple but effective principle: a rope is extended in proportion to the movement of the measurement object. Their easy handling and high flexibility make them ideal for use in the Industrial automationin vehicle systems and in construction technology. Discover cable pull encoders to improve accuracy and efficiency in these areas.

Contents

• Small, versatile cable pull switch for automation
• Small cable pull sensors for path and distance measurements
• Cable puller with non-contact sensor technology
• Robust cables and cable encoder linear encoder
• Actuated encoder for position measurement with direct measurement display
• Draw wire systems scale rope cable systems to the point

Small, versatile cable pull switch for automation

28.03.2022 | Schmersal introduces a new one with the PS216 Cable switch before. It is suitable as a signal transmitter for starting machines and systems, for opening electrically powered gates and doors, and as a light switch in the elevator shaft. The cable pull switch has a small design and can be used in a variety of ways. 

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Small cable pull sensors for path and distance measurements

25.04.2019 | Micro-Epsilon presents the world's smallest cable pull sensor: The MT8 wire sensor, which weighs just 19 g, is just 19 x 19 mm in size and is used for path and distance measurements with a measuring range of 40 mm. The sensor is extremely compact, works highly dynamically and enables rope accelerations of up to 60 g. The new MT series also includes the MT33 and MT56, which have the smallest possible designs in relation to their measuring ranges.

The Wire sensor MT series includes extremely compact cable-operated displacement sensors that can be integrated into extremely confined spaces. The MT19 model is particularly suitable for applications that require high dynamics, such as in crash tests, simulators or test benches.

With the models MT33 and MT56 the MT series two further miniature cable sensors that cover measuring ranges up to 130 mm. They were designed to be as small as possible in relation to their measuring ranges.

The three miniature cable sensors have a robust aluminum housing and are therefore optimally tailored to industrial applications. Two through holes in the Housing as well as the integrated ring eyelet at the end of the rope enable quick and easy sensor installation.

Cable puller with non-contact sensor technology

March 21.03.2019, XNUMX | Cable pull sensors measure how far telescopic arms or vehicle supports of commercial vehicles are extended. Gefran has now expanded its series of cable pull sensors for the mobile hydraulics for measuring ranges from 1800 to 8300 mm around the GSH cable pull sensor.

It combines the advantages of the tried and tested sister model GSF with the contactless The latest generation of Hall sensor technology. In addition, it has the same connection dimensions as the GSF, but is slightly flatter and is available in many configurations.

The GSH offers high performance, IP protection class 67, shock and vibration resistance as well as high electromagnetic compatibility. It also has a durable pull rope made of AISI316 stainless steel with a diameter of 0,85 mm, which has been coated with nylon for even better durability.

Robust cables and cable encoder linear encoder

April 01.04.2016, XNUMX | The cable pull rotary encoder portfolio from Pepperl + Fuchs offers a modular product architecture with a wide variety of variants for almost every area of ​​application. Optimally coordinated components ensure a long service life and ensure reliable processes in linear path measurement and positioning.

Cable rotary encoders are very suitable for recording linear movement sequences. Inside a cable winds up steel cable around a spring-loaded drum. This rotates the shaft of a rotary encoder when the rope is extended or retracted, thus transferring a translational into a rotary movement.

The consistently modular design concept enables the perfect coordination of cable pull, Encoder and accessory components. It ranges from a particularly compact design to an extremely robust version and covers a wide range of applications. Distances of up to 60 m can be recorded. Standardized interfaces support easy integration into any system environment. A comprehensive range of accessories enables use even under the most adverse conditions.

Position sensors for special effects in the big blockbuster cinema

A typical range of applications for rotary encoders are: Driverless transport systems. Here they are integrated into the lifting unit to record position and speed. The same applies, for example, to mobile extension cranes. Here they monitor the linear retraction and extension movements of booms in real time and thus provide the electronic crane control system with precise information about the current position.

The automation is especially designed for outdoor use Heavy-duty variants, which have proven themselves in shipbuilding and offshore applications. They reliably monitor the movement processes of mobile machines, conveyor systems, cranes and wind turbines, even in extreme weather conditions.

Actuated encoder for position measurement with direct measurement display

Sep 09.09.2015, XNUMX | In many areas of industry or mechanical engineering there are measuring tasks with cable encoders Distance or distance measurement, which are not connected to controls but want to have the measured value displayed. Be it in conveyor technology, packaging, paper or textile industries: In all areas there is the task of controlling distances with millimeter precision.

In addition to the well-known measuring devices for measuring lengths, angles, speeds and inclinations Siko also offers a new measuring display with attached cable pull for a variety of applications.

The Measurement display MA508SG from the “Magline” product line measures distances of up to 2000 mm measuring length and displays the measured distance directly with a resolution of 0,1 mm in the spatially separated measurement displays from the Siko cable pull transmitter. This offers the advantage that the measuring display can in principle be mounted anywhere on the machine. For other known solutions, the measuring length is 1000 mm.

Distance sensor with fast time-of-flight measurement method

The cable displacement sensor is used for Signal output a magnetic ring integrated. The pulses emitted by the magnetic ring are converted into the corresponding path information by the measuring display and displayed. The area of ​​application is in applications with measuring ranges of up to 2000 mm. The compact dimensions enable problem-free structural integration even in tight installation spaces. By pressing a button, the measurement display can be set to zero or to a predefined offset value at any point. Additional parameters can be programmed using an external PTM programming device via a programming input.

Draw wire systems scale rope cable systems to the point

May 20.05.2014, XNUMX | With cable pull sensors based on magnetic encoders Linear movements can be reliably recorded in a measuring range of up to 10 m.

With the 'Linarix' product range Posital a wide variety of cable pull sensors that can replace linear measuring systems with potentiometers in applications such as industrial trucks, construction machinery and medical technology.

Unlike potentiometers, whose measuring range is determined by the sliding contacts, cable pull sensors offer the advantage of Scalability: Using push buttons, users can set the devices to the desired measuring range.

Two light-emitting diodes show the current status and make operation easier. After scaling, the analog output value corresponds exactly to the previously defined characteristic curve, so that the effort in further processing is minimized.

Thanks to their non-contact magnetic measuring principle, the cable pull systems are extremely precise, durable and robust. Equipped with a current or a voltage output, the systems can optionally be equipped with a variety of interface like Canopen, Devicenet, J1939, Ethernet Powerlink, Modbus/TCP / TCP/IP / UDP, Profibus DP, Ethernet/IP, Profinet IO, SSI, incremental and optical based encoder to be delivered.

FAQ

What is a cable transmitter or cable sensor?

A cable transmitter, also known as a cable sensor or cable displacement sensor, is a device for precise Measurement of linear movements. It consists of a housing in which a spring-tensioned cable is wound on a cable drum. The rope is connected to a measurement object, so any movement of the object causes the rope to unwind or coil up. The rotation of the roller is detected by a sensor and converted into an electrical signal that corresponds to the movement of the measuring cable.

Where are cable pull sensors used?

Cable pull encoders are often used in applications where long measuring distances and a high degree of flexibility in the positioning of the sensor is required, for example in industrial automation, in crane systems and in vehicle technology.

What is a displacement sensor?

A displacement sensor is a measuring device that is used to position or movement of an object in a linear or rotational movement and convert it into an electrical signal. These sensors are used to obtain precise information about an object's location, speed, acceleration or change in direction.

Which displacement sensors are there?

There are different types of displacement sensors used to measure linear or rotational movements. They are suitable for different applications depending on the requirements for accuracy, resolution, environmental conditions and measuring range. The most common include:

• Inductive Distance sensors use electromagnetic fields to determine the position of a metal object. They are robust and insensitive to environmental influences.
• capacitive Displacement sensors measure changes in capacitance caused by the approach of an object. They are suitable for measuring non-metallic materials and are very precise.
• Optical Displacement sensors use light, often a laser, to measure the distance or position of an object. They offer high accuracy and resolution.
• Ultrasonic-Displacement sensors use sound waves to measure distance. They are suitable for applications where non-contact measurements are required.
• cable-Displacement sensors consist of a rope wound on a pulley whose movement is used to measure linear distances.
• Potentiometric Distance sensors (potentiometers) use a resistance element whose resistance value changes with the position of the slider or rotary knob.
• Magnetostrictive Distance sensors use the magnetostrictive properties of certain materials to precisely determine position.

Source: This article is based on information from the following companies: Gefran, Micro Epsilon, Pepperl+Fuchs, Posital, Schmersal, Siko.

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