Strap pulling device and pulling method

A strap pulling device, comprising:

• a cutter mechanism;
• a first strap pulling mechanism;
• a second strap pulling mechanism;
• a third strap pulling mechanism;
• and
• a fourth strap pulling mechanism,
• wherein
• the first strap pulling mechanism clamps a free end of a strap and pulls the strap from a pulling position to a transfer position, and the second strap pulling mechanism moves to the pulling position to clamp the strap, such that the first strap pulling mechanism and the second strap pulling mechanism simultaneously clamp the strap, wherein the pulling position is located upstream of a cutting position and the transfer position is located downstream of the cutting position;
• and
• wherein the cutter mechanism cuts the strap at the cutting position to acquire a strap segment having a predetermined length,
• wherein the strap pulling device is configured to implement a first operation comprising that the first strap pulling mechanism pulls the clamped strap from the pulling position passing the cutting position directly to the transfer position, the second strap pulling mechanism clamps the strap at the pulling position, and the cutter mechanism cuts the strap at the cutting position to acquire the strap segment having the predetermined length, and one of the third strap pulling mechanism or the fourth strap pulling mechanism clamps the strap pulled to the transfer position and pull the strap segment to a downstream position located downstream of the transfer position, and
• wherein the strap pulling device is configured to implement a second operation comprising that the second strap pulling mechanism pulls the clamped strap from the pulling position passing the cutting position directly to the transfer position, the first strap pulling mechanism clamps the strap at the pulling position, and the cutter mechanism cuts the strap at the cutting position to acquire the strap segment having the predetermined length, and the other one of the third strap pulling mechanism or the fourth strap pulling mechanism clamps the strap pulled to the transfer position and pull the strap segment to the downstream position, and
• wherein a direction from the pulling position to the transfer position is the same as a direction from the transfer position to the downstream position.

A strap pulling method implemented by a strap pulling device comprising a cutter mechanism, a first strap pulling mechanism, a second strap pulling mechanism, a third strap pulling mechanism and a fourth strap pulling mechanism, the method comprising:

• alternately clamping a strap at a pulling position located upstream of a cutting position, and pulling the clamped strap to a transfer position located downstream of the cutting position, by the first strap pulling mechanism and the second strap pulling mechanism,
• wherein in a first operation, the first strap pulling mechanism pulls the clamped strap from the pulling position passing the cutting position directly to the transfer position, the second strap pulling mechanism clamps the strap at the pulling position, and the cutter mechanism cuts the strap at the cutting position to acquire a strap segment having a predetermined length, and one of the third strap pulling mechanism or the fourth strap pulling mechanism clamps the strap pulled to the transfer position and pull the strap segment to a downstream position located downstream of the transfer position, and
• wherein in a second operation, the second strap pulling mechanism pulls the clamped strap from the pulling position passing the cutting position directly to the transfer position, the first strap pulling mechanism clamps the strap at the pulling position, and the cutter mechanism cuts the strap at the cutting position to acquire the strap segment having the predetermined length, and the other one of the third strap pulling mechanism or the fourth strap pulling mechanism clamps the strap pulled to the transfer position and pull the strap segment to the downstream position, and
• wherein a direction from the pulling position to the transfer position is the same as a direction from the transfer position to the downstream position.