Abstract: A movable paper guide structure of a label printer includes: a paper guide body installed in the label printer including a roller and a print head; a movable unit that is movably installed on the paper guide body close to one end of the print head, adapts to a displacement of the roller and the print head because of a changed contact position, and keeps approaching the print head during a print process of the label printer for neither gap between the tip of the movable unit and the print head nor other problems such as a label sticker on printing paper improperly peeled off, printing crooked and paper jam.

Abstract: A movable paper guide structure of a label printer includes: a paper guide body installed in the label printer including a roller and a print head; a movable unit that is movably installed on the paper guide body close to one end of the print head, adapts to a displacement of the roller and the print head because of a changed contact position, and keeps approaching the print head during a print process of the label printer for neither gap between the tip of the movable unit and the print head nor other problems such as a label sticker on printing paper improperly peeled off, printing crooked and paper jam.

Abstract: A dual-direction positioning device includes a main body, a first clamping structure, a second clamping structure, a first swing arm, a second swing arm, a coupling unit, and a first elastic element. The main body has a guiding trench portion. The first clamping structure and the second clamping structure are to and fro movably assembled to the guiding trench portion. The first swing arm is rotatably assembled on the first clamping structure and has a first engaging portion. The second swing arm is rotatably assembled on the second clamping structure and has a second engaging portion. The first engaging portion and the second engaging portion are rotatably assembled on the coupling unit and engaged with each other. The first elastic element has a first fixed end located between the first clamping structure and the second clamping structure and a first connecting end located on the first clamping structure.

Abstract: A dual-direction positioning device includes a main body, a first clamping structure, a second clamping structure, a first swing arm, a second swing arm, a coupling unit, and a first elastic element. The main body has a guiding trench portion. The first clamping structure and the second clamping structure are to and fro movably assembled to the guiding trench portion. The first swing arm is rotatably assembled on the first clamping structure and has a first engaging portion. The second swing arm is rotatably assembled on the second clamping structure and has a second engaging portion. The first engaging portion and the second engaging portion are rotatably assembled on the coupling unit and engaged with each other. The first elastic element has a first fixed end located between the first clamping structure and the second clamping structure and a first connecting end located on the first clamping structure.

Abstract: A barcode label retention device is provided for a barcode printer. The barcode label retention device includes s at least one pair of label roll retainers, at least one pair of resilient elements, and at least one pair of fixing plates. The label roll retainers are mounted inside a housing of a barcode printer and spaced from each other to receive and retain a label roll therebetween. The resilient elements are arranged inside each label roll retainer, and the fixing plates are arranged inside each label roll retainer. The fixing plate is connected to the resilient element to provide the fixing plate with resiliency for inward depressibility or outward biasing so that a front portion of the fixing plate projects inwards beyond the label roll retainer to abut against opposite ends of the label roll, whereby the label roll can be securely held by the two fixing plates engaging the opposite ends thereof and the path of a winding/unwinding operation can be stabilized.

Abstract: A label roll positioning device is provided for a barcode printer and includes at least one slide rail, at least one positioning rail, and at least one pair of roll retainers. The slide rail and the positioning rail are arranged in a parallel manner inside a housing of the barcode printer. The positioning rail forms teeth on a surface thereof. At least one of the roll retainers has a bottom forming a mounting portion that is slidably fit and mounted to the slide rail for being slidable along the slide rail. The roll retainers are spaced to receive a roll of label therebetween in a securely held manner. The roll retainer is provided therein at least one positioning plug having an end forming a locking section. The positioning plug can be downward driven to have the locking section downward projecting out of the roll retainer, and the positioning plug can be upward driven to have the locking section back into concealment inside the roll retainer.

Abstract: A carbon ribbon retaining mechanism includes a barcode-printer base, an upper cover, a printing head device, and at least one pair of resilient fastener elements. The barcode-printer base has an upper portion forming a receiving space. The upper cover is coupled to the receiving space of the barcode-printer base for being downward closed to and covering the receiving space. At least one pawl is respectively formed on opposite edge portions of the upper cover. The printing head device is accommodated in the receiving space. A carbon ribbon retention shaft is arranged above the printing head device. The resilient fastener elements are mounted above the printing head device. By means of the engagement effected between the pawls of the upper cover and the resilient fastener elements, the upper cover is fixed to and above the printing head device to cover the receiving space.

Abstract: A front cover structure is used in a label printer, including a back board forming a paper roll support device; a front board coupled to the back board and defining a first hole and including a first cross bar, a second cross bar and a third cross bar, of which the second and third cross bars are parallel to and positioned against the first cross bar; a pressing board defining two second holes in two side projections thereof and a third hole, and being coupled to the front board with a first connection bar extending through the first hole and the second holes; and a lock board defining a plurality of fourth holes in opposite edge portions and being coupled to the pressing board with a second connection bar extending through the third hole and the fourth holes.

Abstract: A carbon ribbon retaining mechanism includes a barcode-printer base, an upper cover, a printing head device, and at least one pair of resilient fastener elements. The barcode-printer base has an upper portion forming a receiving space. The upper cover is coupled to the receiving space of the barcode-printer base for being downward closed to and covering the receiving space. At least one pawl is respectively formed on opposite edge portions of the upper cover. The printing head device is accommodated in the receiving space. A carbon ribbon retention shaft is arranged above the printing head device. The resilient fastener elements are mounted above the printing head device. By means of the engagement effected between the pawls of the upper cover and the resilient fastener elements, the upper cover is fixed to and above the printing head device to cover the receiving space.

Abstract: A printing mechanism is provided for a barcode printer and includes a frame, a printing head, a carbon ribbon axle, and a carbon ribbon collection axle. The frame is mounted to an upper end portion of an upper casing member. The printing head is mounted in the frame to effect printing of labels. The carbon ribbon axle is arranged in a lower portion of the frame and is located below the printing head for connecting and retaining a carbon ribbon that supplies a toner required for carrying out the printing of the labels by the printing head. The carbon ribbon collection axle is arranged in an upper portion of the frame and is located above the printing head in an arrangement that is reversed to the carbon ribbon axle to allow the carbon ribbon from the carbon ribbon axle to be rolled up in the carbon ribbon collection axle after the printing operation carried out by the printing head.

Abstract: A label roll positioning device is provided for a barcode printer and includes at least one slide rail, at least one positioning rail, and at least one pair of roll retainers. The slide rail and the positioning rail are arranged in a parallel manner inside a housing of the barcode printer. The positioning rail forms teeth on a surface thereof. At least one of the roll retainers has a bottom forming a mounting portion that is slidably fit and mounted to the slide rail for being slidable along the slide rail. The roll retainers are spaced to receive a roll of label therebetween in a securely held manner. The roll retainer is provided therein at least one positioning plug having an end forming a locking section. The positioning plug can be downward driven to have the locking section downward projecting out of the roll retainer, and the positioning plug can be upward driven to have the locking section back into concealment inside the roll retainer.

Abstract: A barcode label retention device is provided for a barcode printer. The barcode label retention device includes s at least one pair of label roll retainers, at least one pair of resilient elements, and at least one pair of fixing plates. The label roll retainers are mounted inside a housing of a barcode printer and spaced from each other to receive and retain a label roll therebetween. The resilient elements are arranged inside each label roll retainer, and the fixing plates are arranged inside each label roll retainer. The fixing plate is connected to the resilient element to provide the fixing plate with resiliency for inward depressibility or outward biasing so that a front portion of the fixing plate projects inwards beyond the label roll retainer to abut against opposite ends of the label roll, whereby the label roll can be securely held by the two fixing plates engaging the opposite ends thereof and the path of a winding/unwinding operation can be stabilized.

Abstract: A front cover structure is used in a label printer, including a back board forming a paper roll support device; a front board coupled to the back board and defining a first hole and including a first cross bar, a second cross bar and a third cross bar, of which the second and third cross bars are parallel to and positioned against the first cross bar; a pressing board defining two second holes in two side projections thereof and a third hole, and being coupled to the front board with a first connection bar extending through the first hole and the second holes; and a lock board defining a plurality of fourth holes in opposite edge portions and being coupled to the pressing board with a second connection bar extending through the third hole and the fourth holes.

Abstract: A strengthened structure for a body of a label printer is disclosed, including: a plurality of metal tubes extending through the body of the label printer and each having first and second ends respectively fixed to first and second side portions of the body of the label printer to structurally strengthen the body of the label printer; and two covering layers attached to and covering the first and second side portions of the body of the label printer, wherein the covering layers include shock-absorption materials to buffer external impact acting on the body of the label printer.