A transfer apparatus for transferring electronic devices

Disclosed is a transfer apparatus for transferring electronic devices, comprising: (i) a conveying track for conveying electronic devices in a row having a 5 leading electronic device located at a front of the row; (ii) first and second vacuum passages connected to the conveying track, the first and second vacuum passages being operative to create vacuum forces to hold electronic devices against the conveying track at a first device position and a second device position respectively such that there is no overlapping 10 between the electronic devices; and (iii) first and second sensors arranged with respect to the conveying track, the first sensor being operative to detect a presence or absence of the leading electronic device at the first device position for removal of the leading electronic device from the conveying track, and the second sensor being operative to detect a presence or absence of the leading electronic device at a sensor position 15 between the first and second device positions as the leading