Abstract: An improved marking gun for printing and applying adhesive price labels and the like, carried by a tape backing, the gun being of the type having a printing head connected to an operating trigger for imprinting the labels and wherein the improvements include a drive drum having radially projecting teeth for engagement with perforations in the label backing tape together with a pressure roller geared to rotate with the drive drum and exert a sufficient pressure on the backing tape to hold it against the drive wheel such that when the drive drum and pressure roller are initially rotated by the action of squeezing the marking gun trigger, the pulling force thereby exerted on the backing tape is less than the frictional force exerted by the printer which must necessarily be overcome to pull the backing tape and the labels through the printer.

Abstract: A marking gun for printing adhesive labels with pricing and the like having a printing head directly connected to an operating trigger for impressing the labels, a drive wheel is linked to the operation trigger by a ratchet and pawl assembly for incremental advancing of the labels carried on a backing tape, the tape being transported by radial drive teeth which engage perforations in the backing tape, separation of the labels from the tape being aided by a cam operated pressure shoe, and threading of the tape through the gun being aided by a retractable spring biased guide member which holds the backing tape against the drive wheel during operation, and guides the tape around the drive wheel during threading when retracted by a thumb trigger that projects from the casing of the marking gun.