Paper holder device compatible with tube core size and thermal printer

Abstract

The invention provides a tube core size compatible paper holder device and a thermal printer, the tube core size compatible paper holder device comprises two paper holder blocks, a first spring and a slide block, the paper holder blocks are provided with bearing convex columns, the peripheries of the bearing convex columns are provided with first bearing peripheral walls, the paper holder blocks are provided with annular grooves at the peripheries of the first bearing peripheral walls, the slide block is provided with slide holes, and the slide holes are communicated with the first bearing peripheral walls. The paper holder device is arranged in the paper bin and provided with the sliding block capable of moving in the paper width direction, in the first bearing state, the sliding block retracts towards the interior of the annular groove, the second bearing peripheral wall retracts back into the annular groove, then the first bearing peripheral wall is used for bearing a tube core with the small diameter, and the tube core with the small diameter is placed in the paper bin. And in the second bearing state, the sliding block extends towards the paper clamping position, and the second bearing peripheral wall is used for bearing the pipe core with a larger diameter, so that the roll cores with different diameters can be supported.

Description

Technical Field

[0001] The invention relates to the field of thermal printing, in particular to a paper rack device and a thermal printer compatible with tube core sizes. Background Art

[0002] With the popularization of thermal printers, they are not only used in bank ATMs, supermarket checkout counters, catering industry and e-commerce delivery offices, but also include thermal transfer printers that use the principle of carbon ribbon thermal transfer, and thermal printers that use thermal paper thermal imaging. With the rapid growth of printing in the e-commerce and express delivery industries, there are higher requirements for the stability of use and ease of operation of thermal printers.

[0003] Thermal printers are generally provided with a base, a cover, a rubber roller and a thermal film. The printing paper enters the position between the rubber roller and the thermal film, and the thermal film is heated to form the image and text.

[0004] Printing paper is generally rolled up outside a tube core. The thermal printer is set up by a paper roll stand. The printing paper roll can be rotated on the paper roll stand to realize the transportation of the printing paper. Since different printing papers have different widths, it is necessary to design a corresponding structure to conveniently adapt to paper stands of different tube core sizes to improve the paper roll adaptability of the printer. Summary of the invention

[0005] A first object of the present invention is to provide a paper holder device that is compatible with the size of the tube core.

[0006] A second object of the present invention is to provide a thermal printer having the above-mentioned paper holder device.

[0007] In order to achieve the first object of the present invention, the present invention provides a paper rack device compatible with the size of the tube core, comprising two paper rack blocks arranged along the paper width direction, a paper clamping position is arranged between the two paper rack blocks, a receiving convex column is arranged on the end surface of the paper rack block facing the paper clamping position in the paper width direction, the receiving convex column extends toward the paper clamping position along the paper width direction, a first receiving peripheral wall is arranged on the outer periphery of the receiving convex column, and the paper rack block is provided with an annular groove on the outer periphery of the first receiving peripheral wall, and the annular groove has an opening toward the paper clamping position; the paper rack device also includes two first springs and two sliders, one first spring is arranged on a In the annular groove, the slider extends along the paper width direction, and a sliding hole extending in the paper width direction is penetrated in the slider. A second receiving peripheral wall is arranged on the outer periphery of the slider, and the receiving boss passes through the sliding hole. A slider is movably arranged in an annular groove along the paper width direction, and a first spring is connected between the slider and the paper holder block, and the first spring applies an elastic force toward the paper clamping position to the slider; in a first receiving state, the slider retreats toward the annular groove, and the second receiving peripheral wall is located in the annular groove, and the first receiving peripheral wall is used to receive the tube core; in a second receiving state, the slider extends toward the paper clamping position, and the second receiving peripheral wall is used to receive the tube core.

[0008] A further solution is that a retaining wall is provided on the outer side of the annular groove relative to the paper clamping position in the paper width direction, and the first spring is connected between the slider and the retaining wall.

[0009] A further solution is that the retaining wall is provided with a card slot, the slider is provided with a card column extending along the paper width direction, the end of the card column is provided with a card part, the card column can movably pass through the card slot, and the card part is located on the outer side of the card slot and engages with the card slot.

[0010] A further solution is that the retaining wall is provided with a plurality of clamping grooves along the circumferential direction, and the sliding block is provided with a plurality of clamping columns along the circumferential direction.

[0011] A further solution is that the paper rack device also includes a centering module, which includes two racks, a center gear and a second spring. A paper rack block is connected to a rack, the two racks extend along the paper width direction, and the two racks are respectively engaged on both sides of the radial direction of the center gear. The second spring is connected to one of the racks and applies a centering elastic force to the rack.

[0012] A further solution is that the paper rack block is provided with a hand grip groove and a limit groove in sequence on the front side of the receiving boss based on the paper length direction, the hand grip groove has an upper opening at the top, the limit groove extends along the paper width direction, and the limit groove has a lower opening at the bottom.

[0013] A further solution is that the paper holder block is provided with a limiting boss above the limiting slot, the limiting boss extends inwardly along the paper width direction, a paper passing slot is provided between the limiting boss and the limiting slot, and the paper passing slot is connected to the paper clamping position.

[0014] A further solution is that the paper rack device also includes a locking block, the paper rack block is provided with a mounting groove in the vertical direction, the bottom of the mounting groove is provided with a through groove in the vertical direction, an operating part is provided at the upper end of the locking block, and a locking part is provided at the lower end of the locking block, the locking block is movably installed in the mounting groove, and the locking part passes through the through groove.

[0015] A further solution is that the lock portion is provided with a stop surface and a sliding inclined surface, the stop surface is perpendicular to the paper width direction, there is an acute angle between the stop surface and the sliding inclined surface, and the sliding inclined surface is located on the outside of the stop surface.

[0016] In order to achieve the second purpose of the present invention, the present invention provides a thermal printer, including a base, a cover, a rubber roller, a thermal sheet and a paper holder device, wherein one of the rubber roller and the thermal sheet is arranged on the base, and the other of the rubber roller and the thermal sheet is arranged on the cover, the base is provided with a paper bin, and the thermal sheet and the rubber roller are opposite to each other; the paper holder device is a paper holder device as described above; and the paper holder device is arranged in the paper bin.

[0017] The beneficial effect of the present invention is that, by arranging a paper rack device in the paper bin, the paper rack device has a slider that can move in the paper width direction, in the first receiving state, the slider retracts toward the annular groove, and the second receiving peripheral wall retracts back into the annular groove, and then the first receiving peripheral wall is used to receive a tube core with a smaller diameter, and in the second receiving state, the slider extends toward the paper clamping position, and the second receiving peripheral wall is used to receive a tube core with a larger diameter, thereby being able to support winding cores of different diameters, and in addition, the setting of the retaining wall is coordinated with the spring to provide a stable supporting force, and By utilizing the limiting cooperation between the card column and the card slot, the slider can be stable and not slide away. Furthermore, through the arrangement of the centering module, the two paper holder blocks are moved toward the middle of the paper clamping position, and the locking block is locked to lock the position of the paper holder block. Then, by utilizing the hand latch slot and the limiting slot located on the front side, the paper holder block can be more evenly stressed and move more smoothly when the hand latch slot is manually pulled. In addition, the paper feed slot formed by the limiting convex column is used to limit the feeding of the printing paper, so that the paper feeding can be more stably input to the thermal film, which can further improve the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of an embodiment of a thermal printer of the present invention.

[0019] Figure 2 It is a structural diagram of the thermal printer embodiment of the present invention when the cover is opened.

[0020] Figure 3 It is a structural diagram of a base in an embodiment of a thermal printer of the present invention.

[0021] Figure 4 It is a structural diagram of an embodiment of a paper rack device of the present invention.

[0022] Figure 5 It is an exploded view of an embodiment of a paper rack device of the present invention.

[0023] Figure 6 It is an exploded view of the paper rack device embodiment of the present invention at another viewing angle.

[0024] Figure 7 It is a cross-sectional view of the paper rack device embodiment of the present invention in a locked state.

[0025] Figure 8 yes Figure 7 Enlarged view at A.

[0026] Fig. 9 It is a partial cross-sectional view of the paper holder device embodiment of the present invention in the unlocked state.

[0027] Fig.10 It is a cross-sectional view of an embodiment of a paper rack device of the present invention in a first receiving state.

[0028] Fig.11It is a cross-sectional view of an embodiment of a paper rack device of the present invention in a second receiving state.

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0030] Reference Figures 1 to 11 The thermal printer 1 includes a base 11, a cover 11, a rubber roller 111, a thermal sheet 121 and a paper holder 2. The rubber roller 111 is arranged on the base 11, the thermal sheet 121 is arranged on the cover 11, the base 11 is provided with a paper bin 13, the thermal sheet 121 and the rubber roller 111 are opposite to each other and form a paper feeding channel, and the paper holder 2 is arranged in the paper bin 13.

[0031] The paper rack device 2 includes two paper rack blocks 21 arranged along the paper width direction Y, a paper clamping position 20 is arranged between the two paper rack blocks 21, and a receiving boss 213 is arranged on the end face 211 of the paper rack block 21 facing the paper clamping position 20 in the paper width direction Y. The receiving boss 213 can be arranged in a circular or square shape. The receiving boss 213 extends toward the paper clamping position 20 along the paper width direction Y. A first receiving peripheral wall 214 is arranged on the periphery of the receiving boss 213. The paper rack block 21 is provided with an annular groove 212 on the periphery of the first receiving peripheral wall 214. The annular groove 212 has an opening facing the paper clamping position 20. A retaining wall 224 is arranged on the outer side of the annular groove 212 relative to the paper clamping position 20 in the paper width direction Y, and a plurality of card slots 223 are arranged along the circumferential direction of the retaining wall 224.

[0032] The paper holder device 2 also includes two first springs 26 and two sliders 25. One first spring 26 is arranged in an annular groove 212 along the paper width direction Y. The slider 25 extends along the paper width direction Y. A sliding hole 251 extending in the paper width direction Y is provided through the slider 25. The slider and the sliding hole can be arranged in a circular or square shape. Of course, the shapes of the slider and the sliding hole need to match the shapes of the annular groove and the receiving boss. A second receiving peripheral wall 252 is provided on the outer periphery of the slider 25. The receiving boss 213 passes through the sliding hole 251. A slider 25 can be movably arranged in an annular groove 212 along the paper width direction Y. The first spring 26 is connected between the slider 25 and the paper holder block 21, specifically, the first spring 26 is connected between the slider 25 and the retaining wall 224. The first spring 26 applies an elastic force to the slider 25 toward the paper clamping position 20.

[0033] The slider 25 is provided with a plurality of clamping posts 253 along the circumferential direction. The slider 25 is provided with a clamping post 253 extending along the paper width direction Y. A clamping portion is provided at the end of the clamping post 253. The clamping post 253 can movably pass through the clamping slot 223. The clamping portion is located on the outer side of the clamping slot 223 and is engaged with the clamping slot 223 to prevent the slider 25 from detaching.

[0034] The paper rack device 2 also includes a centering module 24, which includes two racks 241, a central gear 242 and a second spring 244. A paper rack block 21 is connected to a rack 241, and the two racks 241 extend along the paper width direction Y. The two racks 241 are respectively engaged on both sides of the radial direction of the central gear 242. The second spring 244 is connected to one of the racks 241 and applies a centering elastic force to the rack 241.

[0035] The paper holder block 21 is provided with a hand grip groove 215 and a limit groove 218 in sequence on the front side of the receiving boss 213 based on the paper length direction X. The hand grip groove 215 has an upper opening at the top, the limit groove 218 extends along the paper width direction Y, and the limit groove 218 has a lower opening at the bottom. The paper holder block 21 is provided with a limit boss 216 above the limit groove 218, the limit boss 216 extends inwardly along the paper width direction Y, and a paper passing groove 217 is provided between the limit boss 216 and the limit groove 218, and the paper passing groove 217 is connected to the paper clamping position 20.

[0036] The paper rack device 2 further includes a locking block 23. The paper rack block 21 is provided with a mounting groove 219 in the vertical direction. A through groove 222 is provided at the bottom of the mounting groove 219 in the vertical direction. An operating portion 231 is provided at the upper end of the locking block 23. A locking portion 232 is provided at the lower end of the locking block 23. The locking block 23 is movably installed in the mounting groove 219. The locking portion 232 passes through the through groove 222. The locking portion 232 is provided with a stopper surface and a sliding inclined surface. The stopper surface is perpendicular to the paper width direction Y. The stopper surface and the sliding inclined surface form an acute angle. The sliding inclined surface is located on the outer side of the stopper surface.

[0037] The operating portion 231 is located on the inner end surface of the locking block 23, and the outer end surface of the locking block 23 is provided with a block 233 and a boss 234. The block 233 is located on the upper end surface, and the boss 234 is located in the middle. A slide groove 220 is penetrated through the bottom wall of the mounting groove 219, and the slide groove 220 extends in the vertical direction. The block 233 passes through the slide groove 220 and cooperates with the slide groove 220 to limit the position. A convex portion 221 is provided in the middle of the slide groove 220. The convex portion 221 is used to tightly cooperate with the boss 234, which can be used to fix the position of the locking block 23.

[0038] Reference Figure 8-9 as well as Figure 3The base 11 is provided with two moving grooves 112 at the bottom of the paper bin 13. The moving grooves 112 extend along the paper width direction Y and are arranged in a colinear manner. A sawtooth 113 is provided on the bottom wall of one of the moving grooves 112. The base 11 is provided with a limiting protrusion 114 at the front side of the moving groove 112 based on the paper length direction X. The limiting protrusion 114 extends along the paper width direction Y. When the paper holder device 2 is arranged in the paper bin 13, a paper holder block 21 is movably arranged in the moving groove 112, and the limiting groove 218 is connected to the limiting protrusion 114. The limiting groove 218 can slide along the limiting protrusion 114. A paper passing groove 217 is formed between the limiting protrusion 216 and the limiting protrusion 114. The locking portion 232 passes through the through groove 222 and is detachably engaged with the sawtooth 113. When the paper holder block 21 and the locking portion 232 move outward, they slide with the sawtooth 113 through the sliding inclined surface.

[0039] Reference Fig.10 In the first receiving state, the slider 25 retreats toward the annular groove 212, the second receiving peripheral wall 252 is located in the annular groove 212, and the first receiving peripheral wall 214 is exposed. The first receiving peripheral wall 214 is used to receive the tube core. Since the diameter of the receiving boss 213 is small, the first receiving peripheral wall 214 is used to receive the tube core 102 with a smaller diameter.

[0040] Reference Fig.11 In the second receiving state, the slider 25 extends toward the paper clamping position 20, the slider 25 covers the first receiving peripheral wall 214, and the second receiving peripheral wall 252 is exposed. Since the diameter of the slider 25 is larger, the second receiving peripheral wall 252 is used to receive the tube core 101 with a larger diameter.

[0041] Of course, outside this embodiment, the same principle applied to the paper rack device can also be applied to another model or type of thermal printer, such as a thermal sheet arranged on a base, and a rubber roller rotatably arranged on a cover body. This type of printer can also achieve the purpose of the invention by using the paper rack device of this case. In addition, in this embodiment, the paper length direction X and the paper width direction Y are both arranged in the horizontal direction and perpendicular to each other. Outside this embodiment, they can be adjusted accordingly according to the actual placement of the printer.

[0042] As can be seen from the above, by arranging a paper holder device in the paper bin, the paper holder device has a slider that can move in the paper width direction. In the first receiving state, the slider retracts toward the annular groove, and the second receiving peripheral wall retracts back into the annular groove. Then the first receiving peripheral wall is used to receive the tube core with a smaller diameter. In the second receiving state, the slider extends toward the paper clamping position, and the second receiving peripheral wall is used to receive the tube core with a larger diameter. Therefore, it is possible to support the roll cores of different diameter sizes.

Claims

1. A paper rack device compatible with the size of a tube core, comprising two paper rack blocks arranged along the paper width direction, a paper clamping position is provided between the two paper rack blocks, characterized in that: The paper rack block is provided with a receiving convex column on the end surface facing the paper clamping position in the paper width direction, the receiving convex column extends toward the paper clamping position along the paper width direction, the outer periphery of the receiving convex column is provided with a first receiving peripheral wall, and the paper rack block is provided with an annular groove on the outer periphery of the first receiving peripheral wall, and the annular groove has an opening facing the paper clamping position; The paper holder device also includes two first springs and two sliders, one of the first springs is arranged in one of the annular grooves along the paper width direction, the slider extends along the paper width direction, a sliding hole extending in the paper width direction is penetrated in the slider, a second receiving peripheral wall is arranged on the outer periphery of the slider, the receiving convex column passes through the sliding hole, one of the sliders can be movably arranged in one of the annular grooves along the paper width direction, the first spring is connected between the slider and the paper holder block, and the first spring applies an elastic force to the slider toward the paper clamping position; In the first receiving state, the slider retreats toward the annular groove, the second receiving peripheral wall is located in the annular groove, and the first receiving peripheral wall is used to receive the tube core; In the second receiving state, the sliding block extends toward the paper clamping position, and the second receiving peripheral wall is used for receiving the tube core.

2. The paper rack device according to claim 1, characterized in that: The annular groove is provided with a stop wall on the outer side relative to the paper clamping position in the paper width direction, and the first spring is connected between the slider and the stop wall.

3. The paper rack device according to claim 2, characterized in that: The retaining wall is provided with a card slot, the sliding block is provided with a card column extending along the paper width direction, the end of the card column is provided with a card portion, the card column can movably pass through the card slot, and the card portion is located on the outer side of the card slot and engaged with the card slot.

4. The paper rack device according to claim 3, characterized in that: The retaining wall is provided with a plurality of the clamping grooves along the circumferential direction, and the sliding block is provided with a plurality of the clamping columns along the circumferential direction.

5. The paper rack device according to claim 1, characterized in that: The paper rack device also includes a centering module, which includes two racks, a central gear and a second spring. One of the paper rack blocks is connected to one of the racks, and the two racks extend along the paper width direction. The two racks are respectively engaged with the radial sides of the central gear. The second spring is connected to one of the racks and applies a centering elastic force to the rack.

6. The paper rack device according to claim 1, characterized in that: The paper rack block is provided with a hand grip groove and a limit groove in sequence on the front side of the receiving boss based on the paper length direction, the hand grip groove has an upper opening at the top, the limit groove extends along the paper width direction, and the limit groove has a lower opening at the bottom.

7. The paper rack device according to claim 6, characterized in that: The paper rack block is provided with a limiting convex column above the limiting groove, and the limiting convex column extends inwardly along the paper width direction. A paper passing groove is provided between the limiting convex column and the limiting groove, and the paper passing groove is communicated with the paper clamping position.

8. The paper rack device according to any one of claims 1 to 7, characterized in that: The paper rack device also includes a locking block, the paper rack block is provided with an installation groove in the vertical direction, the bottom of the installation groove is provided with a through groove in the vertical direction, the upper end of the locking block is provided with an operating part, the lower end of the locking block is provided with a locking part, the locking block is movably installed in the installation groove, and the locking part passes through the through groove.

9. The paper rack device according to claim 8, characterized in that: The locking portion is provided with a stop straight surface and a sliding inclined surface, the stop straight surface is perpendicular to the paper width direction, an acute angle is formed between the stop straight surface and the sliding inclined surface, and the sliding inclined surface is located on the outer side of the stop straight surface.

10. A thermal printer, comprising a base, a cover, a rubber roller, a thermal sheet and a paper holder, wherein one of the rubber roller and the thermal sheet is arranged on the base, and the other of the rubber roller and the thermal sheet is arranged on the cover, the base is provided with a paper bin, and the thermal sheet and the rubber roller are opposite to each other; Features: The paper rack device is a paper rack device as described in any one of claims 1 to 9 above; The paper rack device is arranged in the paper bin.

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