Patent ID: 7861935

Claim:
A label sheet out-feeding detection device for a barcode printer, comprising: a guide member coupled to a front enclosure of the barcode printer, the guide member forming at least one pair of opposing rails; two casing members mating each other to form a combined casing, at least one of the casing members forming a guide rail having top and bottom extremes forming top and bottom stops respectively, the combined casing having a top portion forming a detection channel; at least a pair of photo-electric detection elements mounted to the top portion of the combined casing and respectively arranged on wall portions of the combined casing that are respectively above and below the detection channel so that the photo-electric detection elements are respectively located above and below the detection channel and are opposing each other to detect out-feeding of a label sheet passing through the detection channel; at least one resilient device coupled to a lower portion of the guide member, the resilient device having an upper end abutting against a bottom portion of the combined casing; and at least one positioning bar having a lower end pivotally jointed to the lower portion of the guide member to have the positioning bar pivotally connected to the guide member, the positioning bar having an upper end forming a positioner, which is fit into and movably received in the guide rail of the combined casing, wherein the positioner is movable along the guide rail between the top and bottom stops of the guide rail and selectively positionable and removably retained on the top and bottom stops and wherein the combined casing is selectively concealed between the rails of the guide member and projects beyond top ends of the rails of the guide member with the resilient device being resiliently compressed or released.