Frame Movement with Servo Motor
- Created on Thursday, 01 August 2019 09:54
- Last Update: Sunday, 06 February 2022 14:28
- Published on Thursday, 01 August 2019 09:54.
- impressions: 3418
ELECTRONIC SYSTEMS WHERE FRAMES ARE DRIVE BY SEPARATE ENGINES
Another type of shedding mechanism offered to the textile market by Tsudakoma and Tokyoda companies is the systems in which each frame is driven by a separate servomotor.
as below Tsudokoma The electronic mouthpiece opening system of the company can be seen. In this system, the rotational movement of the engine is transformed into the up-down movement of the frames with an arm connected to the disk fixed to the motor shaft used for each frame, with a rotating joint at a certain distance from its center, and the following arm mechanisms.
which drives the frames with the main shaft of the machine timing electronics between engines is carried out as.For this purpose, measuring the rotation angle of the main shaft of the machine from the encoder The movements of the motors are controlled according to the German position information.
Unlike dobby and cam shedding mechanisms, in this system, the movement and waiting angles (times) of the frames are the ones to be touched. Depending on the fabric type, it can be entered from the computer and set to the desired values. adjustable.
In addition, the closing angle of the mouthpiece can be adjusted electronically by entering a value into the computer. In this system, since the start and end times of each frame can be adjusted independently, a timing difference between them can be created to prevent all frames from being in the middle position at the same time. This setting is especially important in order to prevent warp breaks and ignition by reducing the friction between the warp threads, especially in the case of plain weave and high warp density fabrics. In the system in the figure, the motors rotate in the same direction, while the frame moves from one position to another in half a revolution of the motor, the frame moves back to the starting position in the other half revolution of the motor.
The half-cycle movement of the motor takes place in the part of the weaving machine main shaft that is reserved for the frame movement. So the rotation of the main shaft 240 º frame moves 120 º motors will make half-cycle movement at 240º of the main shaft speed. The rest 120 º waits in. If the frame needs to wait during a certain number of weft insertions in the lower or upper shed positions according to the knitting, the motors must wait in this position.
in the figure below On the other hand, the shape of the shedding mechanism of Toyoda company is given.
drive of each frame;
It is occurring.
The rotational motion of the servomotors is transmitted from the small gear at the end of the motor shaft to the large gear that can be rotated on the shaft fixed to the machine body. By raising the connection point of the connecting rod to the frame drive arm, more lift of the frame is provided. This adjustment is required for further lifting of the rear frames to create a clean nozzle. The swing movement of the frame drive arm is transmitted to the frame from both ends by arm mechanisms. The features described for the Tsudakoma electronic shedding system are also valid for this system. Separate servomotors of each frame In these electronic shedding systems that are driven by the dobby, there are regions where the slow working back and forth movement is restricted.
In the electronic shedding system developed by Toyoda company, up to 16 frames can be reached. This value is the highest number of frames achievable in dobbies where the frames are driven by separate motors.