Thermal transfer printer with adjustable thermal transfer ribbon pretightening force

Abstract

The utility model provides a thermal transfer printer with adjustable thermal transfer ribbon pre-tightening force, which comprises a base, a cover body, a thermal transfer ribbon frame, a thermal transfer ribbon roller assembly, a rubber roller and a thermosensitive sheet, the thermal transfer ribbon roller assembly comprises a roller to be printed, a recovery roller, a recovery driving assembly and a pre-tightening assembly, and the pre-tightening assembly comprises a linkage shaft, a pressure plate, a turntable, a spring and a torsion spring. The universal driving shaft sequentially penetrates through the pressing disc, the rotating disc, the spring, the torsional spring and the mounting side wall, the spring exerts axial pressing force towards the pressing disc on the rotating disc, the depth of the first clamping groove of the pressing disc is larger than that of the second clamping groove, the clamping part can be clamped with the first clamping groove or the second clamping groove, the first end of the torsional spring is connected with the mounting side wall, and the second end of the torsional spring is connected with the rotating disc. And the torsion spring applies circumferential rotating force around the linkage shaft to the turntable. According to the scheme, different axial pressing forces are realized by clamping different clamping grooves, and then different friction forces are generated, so that different thermal transfer ribbon pre-tightening forces are applied to the thermal transfer ribbon.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of thermal printing, especially relates to a thermal transfer printer with adjustable carbon ribbon pre-tightening force. BACKGROUND

[0002] With the popularization and application of thermal transfer printers such as bill printers and label printers, thermal transfer printers are used not only in bank automatic teller machines, supermarket cash counters, catering industries and e-commerce delivery places, but also in the e-commerce and express industries, which are rapidly growing. Therefore, there are higher requirements for the stability and convenience of thermal transfer printers.

[0003] The thermal transfer printer is generally provided with a base, a cover, a carbon ribbon holder, a rubber roller and a thermal sensitive sheet. The carbon ribbon holder is provided with a carbon ribbon. The printing paper and the carbon ribbon enter the position between the rubber roller and the thermal sensitive sheet. The thermal sensitive sheet is heated to form text patterns on the printing paper by thermal transfer.

[0004] The carbon ribbon roller assembly mainly includes a printing roller and a recycling roller. The printing roller and the recycling roller are rotatably arranged on the carbon ribbon holder. The recycling roller is driven by a recycling drive assembly to realize active recycling. The printing roller is configured with a torsional spring to rotate the printing roller backward, so that the carbon ribbon is kept in a tight state. However, a single torsional spring cannot provide different rotational torsional forces or different pre-tightening forces, which cannot better adapt to different carbon ribbons, different printing substrates or different imaging quality requirements. SUMMARY

[0005] The utility model aims at providing a thermal transfer printer with adjustable carbon ribbon pre-tightening force.

[0006] The utility model provides a carbon ribbon pre -tension adjustable heat transfer printer, including base, cover, carbon ribbon frame, carbon ribbon roller subassembly, rubber roller and thermosensitive sheet, the cover hinge joint department of cover hinge joint is in the base, the carbon ribbon frame carbon ribbon frame hinge joint department hinge joint is in the base, the cover and carbon ribbon frame rotate to the same direction, rubber roller rotatably sets up on the base, carbon ribbon frame includes two installation side walls and installation bottom wall, two installation side walls are located paper width direction's both sides respectively, installation bottom wall is connected between two installation side walls, thermosensitive sheet is installed at the bottom of installation bottom wall, thermosensitive sheet is opposite and sets up with rubber roller and forms the paper path channel along paper length direction extension, and the front side of paper path channel is provided with paper outlet, carbon ribbon roller subassembly includes to be printed roll, recycling roll, recycling drive subassembly and pre -tension subassembly, to be printed roll and recycling roll are erected between two installation side walls, and recycling drive subassembly sets up on installation side wall and drives recycling roll rotation, pre -tension subassembly includes linkage shaft, pressure plate, carousel, spring and torsion spring, linkage shaft rotatably sets up on installation side wall along paper width direction, and the first end of linkage shaft is driven to be connected with to be printed roll, and the second end of linkage shaft is provided with the card portion, and linkage shaft passes through pressure plate, carousel, spring and torsion spring in proper order, and spring exerts axial pressure holding force towards pressure plate to carousel, pressure plate is provided with first clamping groove and second clamping groove, and the depth of first clamping groove in paper width direction is greater than the depth of second clamping groove in paper width direction, and the card portion can be engaged with first clamping groove or second clamping groove, and the first end of torsion spring is connected with installation side wall, and the second end of torsion spring is connected with carousel, and torsion spring exerts circumferential rotation force around linkage shaft to carousel.

[0007] Further, a friction plate is arranged between the pressure plate and the carousel.

[0008] Further, the installation side wall is provided with a positioning ring, the spring is arranged in the positioning ring, and the torsion spring is sleeved outside the positioning ring.

[0009] Further, the installation side wall is provided with a first positioning column, the edge profile of the carousel is provided with a second positioning column, the first end of the torsion spring is connected with the first positioning column, and the second end of the torsion spring is connected with the second positioning column.

[0010] Further, the to-be-printed roller is located on the inner side of the installation side wall, a snap ring is arranged on the outer side of the installation side wall and in the positioning ring, the outer wall of the linkage shaft is provided with a clamping groove, and the clamping groove is engaged with the snap ring and is adjacent to the outer side of the installation side wall.

[0011] Further, the pre-tension assembly comprises a baffle, the baffle is located on the outer side of the snap ring, and the spring is abutted between the baffle and the carousel.

[0012] Further, the card portion is in the form of a pin, and the pin penetrates through the second end of the linkage shaft along the radial direction.

[0013] Further, the first clamping groove and the second clamping groove extend along different radial directions of the linkage shaft, respectively.

[0014] Further, a guide slope is arranged between the first and second clamping grooves.

[0015] Further, the pressure disc is provided with a peripheral wall surrounding the outer periphery of the first and second clamping grooves, and the peripheral wall is provided with an insertion gap in communication with the second clamping groove.

[0016] The utility model discloses the beneficial effect is, utilize the card portion can cooperate with the first clamping groove or the second clamping groove of different depth, then realize different spring compression stroke, when the first clamping groove of carding is deeper, because the spring is relatively released, then the spring exerts the relatively smaller axial pressure of the pressure disc to the rotating disc, when the second clamping groove of carding is shallower, because the spring is compressed deeper, then the spring exerts the greater axial pressure of the pressure disc to the rotating disc, and the torsional spring exerts the circumferential rotation of the linkage shaft to the rotating disc, through different axial pressure, then produce different friction, thereby realize the different carbon tape pre-tightening force of carbon tape. Furthermore, through the friction plate, the friction between the pressure disc and the rotating disc can be effectively increased. And utilize the configuration of the positioning ring and two positioning columns, and through the setting of the snap ring and the baffle, the assembly and positioning of the spring and the torsional spring can be facilitated. Moreover, through the arrangement of the pin and the cooperation of the pin and the guide slope, the rotation adjustment and positioning of the pressure disc by the user can be facilitated, and the pin can be prevented from being separated through the setting of the peripheral wall, and the assembly of the pin can be facilitated through the communication of the insertion gap and the second clamping groove of lower depth. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the structure diagram of the heat transfer printing machine embodiment of the utility model.

[0018] Figure 2 is the structure diagram of the heat transfer printing machine embodiment of the utility model when opening the cover body.

[0019] Figure 3 is the structure diagram of the carbon tape frame in the heat transfer printing machine embodiment of the utility model.

[0020] Figure 4 is the exploded view of the carbon tape roller assembly in the heat transfer printing machine embodiment of the utility model.

[0021] Figure 5 is the structure diagram of the pressure disc in the heat transfer printing machine embodiment of the utility model.

[0022] Figure 6 is the sectional view of the heat transfer printing machine embodiment of the utility model when clamping the first clamping groove.

[0023] Figure 7 is the sectional view of the heat transfer printing machine embodiment of the utility model when clamping the second clamping groove.

[0024] The utility model will be further described below in combination with the drawings and embodiments. DETAILED DESCRIPTION

[0025] Referring to Figures 1 to 7 The thermal transfer printer comprises a base 11, a cover 12, a ribbon holder 2, a ribbon roller assembly, a rubber roller 111 and a thermal sheet 204. The cover hinged part of the cover 12 is hinged to the base 11, and the ribbon holder hinged part 22 of the ribbon holder 2 is hinged to the base 11. The cover 12 and the ribbon holder 2 rotate in the same direction. The rubber roller 111 is rotatably arranged on the base 11. The thermal sheet 204 and the ribbon roller assembly are arranged on the ribbon holder 2.

[0026] The ribbon holder 2 comprises two mounting side walls 201 and a mounting bottom wall 204. The two mounting side walls 201 are respectively located on both sides of the paper width direction Y. The mounting bottom wall 204 is connected between the two mounting side walls 201. The thermal sheet 204 is mounted at the bottom of the mounting bottom wall 204. The thermal sheet 204 is arranged opposite to the rubber roller 111 and forms a paper running channel extending along the paper length direction X. The front side of the paper running channel is provided with a paper outlet 10. The paper length direction X is perpendicular to the paper width direction Y.

[0027] The cover 12 forms an accommodating cavity 122 inside. The cover 12 is located on the base 11 and covers the outside of the ribbon holder 2. The ribbon holder 2 is located in the accommodating cavity 122. The cover 12 is provided with a clamping block 123 on the two side walls in the paper width direction Y. The base 11 is provided with a clamping groove 14 on both sides of the ribbon holder 2 based on the paper width direction Y. The clamping block 123 and the clamping groove 14 are detachably clamped.

[0028] The ribbon roller assembly comprises a printing roller 31, a recycling roller 211, a recycling drive assembly 212 and a pre-tightening assembly 3. The printing roller 31 and the recycling roller 211 are arranged between the two mounting side walls 201. The printing roller 31 can be arranged in one piece or in multiple pieces. The recycling drive assembly 212 comprises a plurality of meshing transmission gears. The recycling drive assembly 212 is arranged on the mounting side wall 201 and connected with the recycling roller 211 and the motor of the base 11. In turn, the recycling drive assembly 212 can receive driving force and drive the recycling roller 211 to rotate.

[0029] The pre-tightening assembly 3 comprises a linkage shaft 32, a pressure plate 33, a friction plate 34, a rotating disc 35, a spring 36 and a torsion spring 37. The linkage shaft 32 extends along the paper width direction Y, and a through hole sequentially penetrates the pressure plate 33, the friction plate 34, the rotating disc 35, the spring 36, the torsion spring 37 and the mounting side wall 201. The linkage shaft 32 is rotatably arranged on the mounting side wall 201 along the paper width direction Y. The first end 321 of the linkage shaft 32 is drivingly connected with the to-be-printed roller 31. The second end of the linkage shaft 32 is provided with a clamping portion, which is arranged in the form of a pin 322 penetrating the second end of the linkage shaft 32 along the radial direction. The linkage shaft 32 sequentially penetrates the pressure plate 33, the friction plate 34, the rotating disc 35, the spring 36 and the torsion spring 37 through the through hole.

[0030] The pressure plate 33 is provided with a first clamping groove 331 and a second clamping groove 332. The depth of the first clamping groove 331 in the paper width direction Y is greater than the depth of the second clamping groove 332 in the paper width direction Y. The first clamping groove 331 and the second clamping groove 332 extend along different radial directions of the linkage shaft 32, respectively. The extension directions of the first clamping groove 331 and the second clamping groove 332 are arranged perpendicularly. A guide inclined surface 333 is arranged between the first clamping groove 331 and the second clamping groove 332. The pressure plate 33 is provided with a peripheral wall 334 surrounding the outer periphery of the first clamping groove 331 and the second clamping groove 332. The peripheral wall 334 is provided with an insertion gap 335 communicating with the second clamping groove 332.

[0031] The friction plate 34 is adjacent to the pressure plate 33 and the rotating disc 35. The mounting side wall 201 is provided with a first positioning column 24. The edge profile of the rotating disc 35 is provided with a second positioning column 351. The first end 371 of the torsion spring 37 is connected with the first positioning column 24. The second end 372 of the torsion spring 37 is connected with the second positioning column 351. The torsion spring 37 applies a circumferential rotation force to the rotating disc 35 around the linkage shaft 32.

[0032] The mounting side wall 201 is provided with a positioning ring 23. The spring 36 is arranged in the positioning ring 23. The torsion spring 37 is sleeved outside the positioning ring 23. The to-be-printed roller 31 is located on the inner side of the mounting side wall 201. The outer side of the mounting side wall 201 and inside the positioning ring 23 is provided with a clamping ring 381. The outer wall of the linkage shaft 32 is provided with a clamping groove. The clamping groove is clamped with the clamping groove and is adjacent to the outer side of the mounting side wall 201. The pre-tightening assembly 3 comprises a baffle 382 located on the outer side of the clamping ring 381. The spring 36 is abutted between the baffle 382 and the rotating disc 35. The spring 36 applies an axial holding force to the rotating disc 35 towards the pressure plate 33.

[0033] Referring to Figure 6, by rotating the pressure disc 3, when the pin 322 is engaged with the second card slot 332 of shallower depth, because the spring 36 is compressed deeper, then the spring 36 exerts a greater axial pressing force on the rotating disc 35 towards the pressure disc 33, when the to-be-printed roller 31 is passively rotated when the carbon tape is unwound, under the constant torsional spring pre-tightening force and the greater axial pressing force, then the to-be-printed roller 31 is more difficult to be passively rotated, i.e. the to-be-printed roller 31 has a greater carbon tape pre-tightening force.

[0034] With reference to Figure 7 , by rotating the pressure disc 3, when the pin 322 is engaged with the second card slot 332 of shallower depth, because the spring 36 is compressed deeper, then the spring 36 exerts a greater axial pressing force on the rotating disc 35 towards the pressure disc 33, when the to-be-printed roller 31 is passively rotated when the carbon tape is unwound, under the constant torsional spring pre-tightening force and the greater axial pressing force, then the to-be-printed roller 31 is more difficult to be passively rotated, i.e. the to-be-printed roller 31 has a greater carbon tape pre-tightening force.

[0035] As can be seen from the above, by using the card part to cooperate with the first card slot or the second card slot of different depths, then different spring compression strokes are realized, when the deeper first card slot is engaged, because the spring is relatively released, then the spring exerts a relatively smaller axial pressing force on the rotating disc towards the pressure disc, on the contrary, when the shallower second card slot is engaged, because the spring is compressed deeper, then the spring exerts a greater axial pressing force on the rotating disc towards the pressure disc, and the torsional spring exerts a circumferential rotating force on the rotating disc around the linkage shaft, by the different axial pressing forces, then different friction forces are generated, thereby realizing different carbon tape pre-tightening forces exerted on the carbon tape.

Claims

1. A thermal transfer printer with adjustable carbon ribbon pre-tightening force, comprising a base, a cover, a carbon ribbon holder, a carbon ribbon roller assembly, a rubber roller and a thermal sensitive sheet, a cover hinge of the cover is hinged to the base, a carbon ribbon holder hinge of the carbon ribbon holder is hinged to the base, the cover and the carbon ribbon holder rotate in the same direction, the rubber roller is rotatably arranged on the base, the carbon ribbon holder comprises two installation side walls and an installation bottom wall, the two installation side walls are respectively located on both sides in the paper width direction, the installation bottom wall is connected between the two installation side walls, the thermal sensitive sheet is installed at the bottom of the installation bottom wall, the thermal sensitive sheet is arranged opposite to the rubber roller and forms a paper passing channel extending in the paper length direction, a paper outlet is arranged on the front side of the paper passing channel; characterized in that: the carbon ribbon roller assembly comprises a printing roller, a recycling roller, a recycling drive assembly and a pre-tightening assembly, the printing roller and the recycling roller are arranged between the two installation side walls, the recycling drive assembly is arranged on the installation side wall and drives the recycling roller to rotate; the pre-tightening assembly comprises a linkage shaft, a pressure disc, a rotating disc, a spring and a torsion spring, the linkage shaft is rotatably arranged on the installation side wall in the paper width direction, a first end of the linkage shaft is drivingly connected with the printing roller, a second end of the linkage shaft is provided with a clamping portion, the linkage shaft sequentially passes through the pressure disc, the rotating disc, the spring and the torsion spring, the spring applies an axial pressing force to the rotating disc towards the pressure disc; the pressure disc is provided with a first clamping groove and a second clamping groove, a depth of the first clamping groove in the paper width direction is greater than a depth of the second clamping groove in the paper width direction, the clamping portion can be clamped with the first clamping groove or the second clamping groove, a first end of the torsion spring is connected with the installation side wall, a second end of the torsion spring is connected with the rotating disc, the torsion spring applies a circumferential rotating force to the rotating disc around the linkage shaft.

2. The thermal transfer printer according to claim 1, characterized in that: a friction plate is arranged between the pressure disc and the rotating disc.

3. The thermal transfer printer according to claim 1, characterized in that: the installation side wall is provided with a positioning ring, the spring is arranged in the positioning ring, and the torsion spring is sleeved outside the positioning ring.

4. The thermal transfer printer according to claim 3, characterized in that: the installation side wall is provided with a first positioning column, an edge contour of the rotating disc is provided with a second positioning column, a first end of the torsion spring is connected with the first positioning column, and a second end of the torsion spring is connected with the second positioning column.

5. The thermal transfer printer according to claim 3, characterized in that: the printing roller is located on the inner side of the installation side wall, a clamping ring is arranged on the outer side of the installation side wall and in the positioning ring, an outer wall of the linkage shaft is provided with a clamping groove, the clamping groove is clamped with the clamping ring and is adjacent to the outer side of the installation side wall.

6. The thermal transfer printer according to claim 5, characterized in that: the pre-tightening assembly comprises a baffle, the baffle is located on the outer side of the clamping ring, and the spring is abutted between the baffle and the rotating disc.

7. The thermal transfer printer according to any one of claims 1 to 6, characterized in that: The card portion is in a pin arrangement, the pin passes through the second end of the linkage shaft in the radial direction.

8. The heat transfer printer according to claim 7, characterized in that: The first card slot and the second card slot extend along different radial directions of the linkage shaft, respectively.

9. The heat transfer printer according to claim 8, characterized in that: A guide slope is arranged between the first card slot and the second card slot.

10. The heat transfer printer according to claim 8, characterized in that: The pressure plate is provided with a peripheral wall, the peripheral wall surrounds the outer periphery of the first card slot and the second card slot, and the peripheral wall is provided with an insertion gap, the insertion gap is in communication with the second card slot.

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