The feeder is an indispensable auxiliary equipment for the automatic operation of the punch. Due to the large variety of punch, wide range of applicable materials and different processing technologies, many kinds of feeders have been born.
There are many kinds of press feeders, including air feeder, roller feeder and NC servo feeder. Here I explain the working principles of the three common models to help customers better select and use.
1. Air feeder
The air feeder is also known as pneumatic feeder.
Its principle is similar to that of medical syringe.
It uses an external compressed air source to provide power, presses the floating rod down by the driving rod installed on the sliding block of the punch, and operates the five hole valve to control the direction of compressed air to achieve the purpose of intermittent feeding.
Advantages of air feeder:
The price is economical and affordable, and the automatic production of punch can be realized under the condition of small investment.
Disadvantages of air feeding:
1. The feeding speed is slow.
Due to the pressure and flow limitation of external air source, the action cycle of air feeder is long, which can not meet the requirements of high-speed feeding.
It is only suitable for low-speed punch.
2. The feeding accuracy is poor and unstable.
The working principle of pneumatic push type makes the air feeder clamp the material and push the material at the same time.
There will be push feeding when the material is not fully clamped, and the material will slide unpredictably during pushing, resulting in poor feeding accuracy;
At the same time, there are many O-rings, seals and other vulnerable parts in the air feeder, which is easy to cause air leakage and other faults due to inadequate maintenance, resulting in unstable operation of the machine.
2. Roller feeder
Roller feeder is also known as roller feeder and mechanical feeder.
Its principle is similar to that of stone grinding tofu.
The pull rod is driven by the output shaft of the punch, the pull rod pulls the rocker arm of the roller, and the rocker arm drives the transmission shaft.
The power of the reciprocating motion of the transmission shaft is transformed into the unidirectional feeding motion of the feeding roller by the unidirectional device.
At the same time, Jin Zhide roller feeder is equipped with a brake device to prevent the feeding roller from retreating.
Advantages of roller feeder:
High cost performance, no additional air source and power supply, high mechanical transmission stability and low failure.
Disadvantages of roller feeder:
1. After shutdown, the feeding step shall be adjusted to the eccentric disc installed on the output shaft of the punch.
It needs to be adjusted several times to calibrate.
2. The installation is limited, and the applicable material width, material thickness and feeding step are strictly limited.
3. NC servo feeder
NC servo feeder, also known as NC NC feeder, uses the feeding roller driven by servo motor to realize the feeding action, and the control of servo motor is completed by touch screen and PLC.
Advantages of NC servo feeder:
- Easy to operate [operate and set on the touch screen];
- Wide application range;
- High degree of customization;
- High feeding accuracy;
- Good stability;
- Multi-stage feeding;
- High feeding accuracy;
- At the same time, it can transport sheets of any length.
Disadvantages of NC servo feeder:
- High cost [the cost of only using servo motor is far higher than that of air feeder and roller feeder];
- Slow feeding speed [affected by the response of servo system];
- It cannot meet the requirements of high-speed feeding.