Band refeeding method in banding packing machine and banding packing machine having refeeding mechanism
A band refeeding method in a banding packing machine is disclosed which can prevent the tip portion of a band from being excessively pulled back even if the band is not supplied correctly but is automatically pulled back, and can stay the band in a predetermined position and can successively supply the band to the band guide arch side. A length of a band to be pulled back to an original position by band pull back means is previously detected based on the number of rotations of a touch roller constituting band supply means. In addition, the number of rotations of the touch roller before reaching a predetected set value is detected when the tip portion of the band is pulled back. Then, a rotating speed of a roller of the band pull back means is reduced when the number of rotations is detected. Therefore, the roller of the band pull back means is subsequently rotated at the low speed, thereby pulling back the tip of the band to a predetermined position.
1. A band refeeding method in a banding packing machine in which, when the tip of the band to be supplied to a predetermined position of a band guide arch by the band supply means is stopped in such a state that it does not reach the predetermined position, band pull back means having a pair of rollers is driven in place of band supply means having a pair of rollers and
a tip portion of a band is returned to an original band feeding position by the band pull back means, and
then the band supply means is driven again, whereby the tip portion of the band is supplied to the predetermined position on the band guide arch side, comprising the steps of:
previously detecting a correct length of the band to be pulled back to the original band feeding position by the band pull back means based on the number of rotations which is obtained from a start of the supply of the band by a touch roller constituting the band supply means to a stop thereof; and
detecting the number of rotations of the touch roller corresponding to a smaller length than the amount of pulling back having the correct length detected previously, when the tip portion of the band is pulled back from such a position that it is stopped,
reducing a rotating speed of the roller of the band pull back means when the number of rotations is detected, and
subsequently rotating the roller of the band pull back means at the low speed, whereby the tip of the band is pulled back to a set position.
2. A banding packing machine having a refeeding mechanism comprising:
a band guide arch;
band supply means having a pair of rollers; and
band pull back means having a pair of rollers,
in which a tip portion of a band is supplied to the band guide arch side by the band supply means, and
the band pull back means is driven in place of the band supply means, when the tip of the band is stopped in such a state that it does not reach a predetermined position, and
the tip portion of the band is returned to an original band feeding position by the band pull back means and
the band supply means is then driven again to supply the tip of the band to the predetermined position on the band guide arch side,
wherein a correct length of the band to be pulled back to the original band feeding position by the band pull back means is previously detected based on the number of rotations, which is obtained from a start of the supply of the band by a touch roller constituting the band supply means to a stop thereof; and
the number of rotations of the touch roller corresponding to a smaller length than the amount of pulling back having the correct length detected previously is detected when the tip portion of the band is pulled back from such a position that it is stopped,
a rotating speed of the roller of the band pull back means is reduced when the number of rotations is detected, and
the roller of the band pull back means is subsequently rotated at the low speed, whereby the tip of the band is pulled back to a set position.