Back and Forth Motion System

Back And Forth Motion System use a back and forth motion case UHING, mechanism which transforms the continuous rotation motion of a smooth shaft in a linear back and forth motion. Cinematically, it is like a screw-nut system. However two supplementary functionalities can be achieved : the setting of the thread of the screw-nut system and the change of the thread direction (helix on the left or on the right). This last functionality allows to change the displacement direction of the case. Otherwise, thanks to a special feature, the inversion of the translation direction of the case is almost instantaneous.

These mechanisms are used a lot in the winding techniques. They are used to distribute correctly the wires or the cables on a bobbin. Technically, for this operation, it is important to check:
The reversing speed which conditions the quality of the winding .
The non sliding between the interior rings of the bearings considering as the nut and the shaft whatever is the acceleration of the case.
The non sliding during the loading of the case

Teaching Objectives of Back And Forth Motion System
This system allows to make practical works in the fields of the Mechanical engineering and electrical engineering:
This system has a high-level mechanical aspect because of the complexity of the reversing and setting thread motion transformation case. It allows to study the functional analysis of the different functions:
To measure the performances of the system (thread setting, transmissible effort before sliding.
To cinematically model the UHING system (contact shaft – bearing ring, thread setting system.
To make a computer simulation (SolidWorks) in relation to the thread setting and direction change subsystems.
The electrical and control aspects are also very important with the Direct Current motor and its 4 quadrants speed driver, the instrumentation (speed, position and force sensors).

Practical works list:
Discovery of the system and internal functional analysis.
Experimental verification of the performances.
Kinematics’ computer simulation
Computer simulation of the thread setting
Computer simulation of the direction change
Measurement of the performances. Reversing time and thread
Study and measurement of the sliding.
Implementation of a winding operation. Associated setting
Closed loop control. Identification of the system
Quadrants functioning of the speed driver

Technical Specifications of Back And Forth Motion System

A testing bench including
A USING case mounted on support with device to implement a winding operation. Two bobbins allow to adjust the device and to achieve this operation with wires of different diameters
A direct current motor
Some sensors allow to measure in real time:
The rotational speed of the motor by a tachometer
The speed of transfer of the case by a tachogenerator
The motor current, picture of the torque
The angular position of the bearing axis similar to a nut according to the time during the reversing time by a potentiometer sensor.
A force sensor allowing to test limits sliding force.

A control cabinet including:
A 4 quadrants electronic speed driver. The input set points imposed to the motor by the speed driver are of the type :step, ramp and sinusoid speed.
A data acquisition card National Instruments allow to reach a frequency of 10 000 Hz.
This level of measurement allows to study the reversing phase which last about 0,1 second.
A digital transmitter for the rotational speed of the motor.
A switch for working in manual or software mode.
A control and data acquisition software
Using case for manipulation.
Case with cover made of Plexiglas® allowing the visualization of the mechanical functioning of the system (setting of the thread and change of direction)

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