Movement locked by torsional spring and thermal printer

Abstract

The utility model provides a torsion spring locking machine core and a thermal printer, the torsion spring locking machine core comprises a thermal sensitive sheet, a rubber roller, a seat body and two lock catch torsion springs, the seat body is provided with a limiting straight groove at one radial side of a positioning groove, and the positioning groove and an arc-shaped supporting groove are respectively arranged at two sides of the extending direction of the limiting straight groove. The lock catch torsional spring comprises a lock catch protruding part, a deformation straight arm part and an arc-shaped supporting part which are sequentially connected, the deformation straight arm part is arranged in the limiting straight groove, the arc-shaped supporting part is arranged in an L-shaped protruding mode based on the deformation straight arm part, the axial end of the rubber roller is elastically clamped through the L-shaped elastic piece, and therefore the rubber roller stably rotates in the positioning groove; and the elastic piece is fixed and limited through the arc-shaped supporting groove, the side blocking wall, the deformation limiting groove and the fixing clamping groove, the deformation direction of the elastic piece is limited while enough supporting degree is provided, the lock catch torsional spring stably rotates on the arrangement plane, and therefore the cost can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of thermal printing equipment, in particular to a torsion spring locked movement and a thermal printer. Background Art

[0002] With the popularization of thermal printers, they are used not only in bank ATMs, supermarket cash registers and e-commerce delivery offices, but also in the rapidly growing e-commerce and express delivery industries. There are higher requirements for the stability, durability, and printing accuracy and speed of the printers, especially for the stability of the rubber roller at high speeds, which directly affects the clamping, paper feeding and imaging quality of the printing paper between the rubber roller and the thermal film.

[0003] To this end, the rubber roller needs to be equipped with a stable locking mechanism, which must also be easy to release. The existing clamping roller generally clamps the two ends of the rubber roller through two locking plates, and the locking plates are connected by a rotating shaft. Not only is the structure relatively complex and occupies a large space, but the cost is also high, which is not conducive to cost control. Utility Model Content

[0004] The first purpose of the utility model is to provide a movement which utilizes a torsion spring to lock a rubber roller.

[0005] The second object of the utility model is to provide a thermal printer with the above-mentioned core.

[0006] In order to achieve the first purpose of the utility model, the utility model provides a torsion spring locking movement, including a thermal sheet, a rubber roller and a seat body, the seat body is provided with a mounting groove extending in the paper width direction, the mounting groove has mounting side walls at both ends along the paper width direction, the thermal sheet is arranged on the mounting groove, the seat body is respectively provided with positioning grooves at both ends of the thermal sheet based on the paper width direction, the positioning groove is used to install the axial end of the rubber roller, the positioning groove is provided with an opening at the top, the thermal sheet and the rubber roller are opposite to each other and form a paper feeding channel, the mounting side wall is provided with a limiting straight groove on one radial side of the positioning groove, the upper end of the limiting straight groove is connected to the positioning groove, and the mounting side wall is connected to the positioning groove at the lower end of the limiting straight groove. An arc-shaped support groove is provided, and the positioning groove and the arc-shaped support groove are respectively located on both sides of the extension direction of the limiting straight groove. The movement also includes two lock torsion springs, which are extended in the layout plane, and the layout plane is perpendicular to the paper width direction. The lock torsion spring includes a lock protrusion, a deformation straight arm portion and an arc-shaped support portion connected in sequence. The deformation straight arm portion is arranged in the limiting straight groove, the lock protrusion portion is located at the opening, and the lock protrusion portion protrudes toward the middle of the positioning groove. The arc-shaped support portion is installed in the arc-shaped support groove with a clearance fit, the deformation straight arm portion can be deformed and moved in the limiting straight groove and on the layout plane, and the lock protrusion portion can move toward or away from the positioning groove on the layout plane.

[0007] A further solution is that the side wall is installed with a side retaining wall, the side retaining wall is located outside the limiting straight groove based on the paper width direction, and the side retaining wall is limitedly matched with the deformable straight arm part.

[0008] A further solution is that a deformation limit groove is provided on the mounting side wall, the deformation limit groove is located above the limit straight groove, the deformation limit groove and the positioning groove are respectively located on both sides of the extension direction of the limit straight groove, the deformation limit groove has an upper baffle wall at the upper end, and the deformation limit groove has a rear baffle wall at the end away from the positioning groove; the first end of the locking protrusion is connected to the deformation straight arm portion, and the second end of the locking protrusion is located in the deformation limit groove, and the upper baffle wall, the rear baffle wall and the second end of the locking protrusion are limitedly matched.

[0009] A further solution is that the limiting straight groove and the arc-shaped supporting groove are both arranged on the outer side of the installation side wall based on the paper width direction.

[0010] A further solution is that the arc-shaped support portion extends in a semicircular arc.

[0011] A further solution is that a fixed slot is provided on the installation side wall, and the fixed slot and the limiting straight slot are respectively located on both sides of the arc-shaped support slot; the locking torsion spring includes a fixed arm portion, and the locking protrusion portion, the deformable straight arm portion, the arc-shaped support portion and the fixed arm portion are connected in sequence, and the fixed arm portion is installed in the fixed slot with a clearance fit.

[0012] A further solution is that the extending direction of the fixed slot is perpendicular to the extending direction of the limiting straight slot.

[0013] A further solution is that the cross section of the fixed slot is arranged in a U shape.

[0014] In order to achieve the second purpose of the utility model, the utility model provides a thermal printer, including a cover body, a base and a movement as described above, the base body is arranged on the base, the rubber roller is arranged on the cover body, and the cover body and the base are hinged.

[0015] The beneficial effect of the utility model is that compared with the solution of using locking plates in the prior art, this solution makes the arc-shaped support part into an L-shaped convex arrangement based on the deformation of the straight arm part, and uses the L-shaped spring plate to elastically clamp the axial end of the rubber roller to make the rubber roller rotate stably in the positioning groove, and uses the arc-shaped support groove, side retaining wall, deformation limit groove and fixed clamping groove to fix and limit the spring plate, while providing sufficient support and limiting its deformation direction, so that the lock torsion spring can stably rotate in the arrangement plane, so this solution can effectively reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of an embodiment of the movement of the utility model.

[0017] Figure 2 It is a structural diagram of the movement embodiment of the utility model from another perspective.

[0018] Figure 3 It is an exploded view of an embodiment of the movement of the utility model.

[0019] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0020] Figure 5 It is a side view of the embodiment of the movement of the utility model in a locked state.

[0021] Figure 6 It is a side view of the embodiment of the movement of the utility model in the unlocked state.

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0023] Reference Figures 1 to 6 The movement includes a thermal sheet 21, a rubber roller 22, a seat body 1 and two locking torsion springs 3. The seat body 1 is provided with a mounting groove 10 extending along the paper width direction Y. The mounting groove 10 has mounting side walls 11 at both ends along the paper width direction Y. The thermal sheet 21 is arranged on the mounting groove 10. The seat body 1 is provided with positioning grooves 111 at both ends of the thermal sheet 21 based on the paper width direction Y. The positioning grooves 111 are used to install the axial end 221 of the rubber roller 22. The positioning grooves 111 are provided with an opening at the top. The thermal sheet 21 and the rubber roller 22 are opposite to each other and form a paper feeding channel.

[0024] The installation side wall 11 on each side is provided with a limiting straight groove 112 on one radial side of the positioning groove 111, and the upper end of the limiting straight groove 112 is connected to the positioning groove 111. The installation side wall 11 is provided with an arc-shaped support groove 114 at the lower end of the limiting straight groove 112. The positioning groove 111 and the arc-shaped support groove 114 are respectively located on both sides of the extension direction of the limiting straight groove 112. The arc-shaped support groove 114 extends in a semicircular arc, and the arc-shaped support groove 114 has an opening along the paper width direction Y. The installation side wall 11 is also provided with a side retaining wall 113, and the side retaining wall 113 is located on the outer side of the limiting straight groove 112 based on the paper width direction Y. A rear wall 12 is provided between the two installation side walls 11, and a holding spring is provided between the rear wall 12 and the thermal sheet 21. The elastic force of the holding spring applies a holding force toward the rubber roller 22 to the thermal sheet 21.

[0025] Each side of the mounting side wall 11 is also provided with a deformation limiting groove 115, which is located above the limiting straight groove 112, and the deformation limiting groove 115 and the positioning groove 111 are respectively located on both sides of the extension direction of the limiting straight groove 112, and the deformation limiting groove 115 has an upper retaining wall 117 at the upper end, and the deformation limiting groove 115 has a rear retaining wall 116 at the end away from the positioning groove 111, and the deformation limiting groove 115 has an opening along the paper width direction Y. Each side of the mounting side wall 11 is also provided with a fixed card slot 118, and the fixed card slot 118 and the limiting straight groove 112 are respectively located on both sides of the arc-shaped support groove 114, and the extension direction of the fixed card slot 118 is perpendicular to the extension direction of the limiting straight groove 112, and the cross section of the fixed card slot 118 is arranged in a U shape, that is, the fixed card slot 118 has a side baffle on the outside of the paper width direction Y, which is used to limit the fixed arm 34. The limiting straight groove 112, the arc-shaped supporting groove 114, the deformation limiting groove 115 and the fixed card groove 118 are all arranged on the outer side of the corresponding installation side wall 11 based on the paper width direction Y, and the two locking torsion springs 3 are respectively located on the outer sides of the two ends in the paper width direction Y.

[0026] The lock torsion spring 3 is formed by bending or integrally forming a filamentary material. Preferably, the filamentary material can be made of conventional metal materials such as steel and copper, and is made by a bending process. The lock torsion spring 3 is extended in the arrangement plane S, and the arrangement plane S is perpendicular to the paper width direction Y. The lock torsion spring 3 includes a lock protrusion 31, a deformation straight arm portion 32, an arc support portion 33 and a fixed arm portion 34 connected in sequence. The deformation straight arm portion 32 is arranged in a limiting straight groove 112, and the side retaining wall 113 is limitedly matched with the deformation straight arm portion 32. The lock protrusion 31 is located at the opening of the positioning groove 111, and the lock protrusion 31 protrudes toward the middle of the positioning groove 111. The first end of the lock protrusion 31 is connected to the deformation straight arm portion 32, and the second end of the lock protrusion 31 is located in the deformation limiting groove 115. The upper retaining wall 117 and the rear retaining wall 116 are limitedly matched with the second end of the lock protrusion 31.

[0027] The arc-shaped support portion 33 extends in a semicircular arc, and is installed in the arc-shaped support groove 114 with a clearance fit. The fixed arm portion 34 is arranged in an L shape, and is installed in the fixed card slot 118 with a clearance fit. The fixed arm portion 34 is limited in the paper width direction Y by the side baffle of the fixed card slot 118.

[0028] The thermal printer includes a cover body, a base and a movement as described above, wherein the base body 1 is arranged on the base, the rubber roller 22 is rotatably arranged on the cover body through a mounting bracket 23, an axle sleeve is arranged outside the axial end 221 of the rubber roller 22, a paper bin is arranged on the base, and the cover body covers the paper bin and is hinged to the base.

[0029] See also Figure 5When the cover is closed, the axial end 221 is located in the positioning groove 111, and the locking protrusion 31 is engaged with the axial end 221. The locking protrusion 31 is driven to move toward the positioning groove 111 on the arrangement plane S through the elastic restoring force of the locking torsion spring 3, so as to improve the locking force on the axial end 221. Figure 6 When it is necessary to open the cover, the cover is pulled by external force, and then the mounting bracket 23 and the rubber roller 22 are driven to move outward, and then the outward movement of the axial end 221 of the rubber roller 22 overcomes the elastic locking force of the locking protrusion 31, driving the locking protrusion 31 to move away from the positioning groove 111 on the layout plane S, and also driving the deformable straight arm portion 32 to deform and move in the limiting straight groove 112 and on the layout plane S, and then the axial end 221 can be separated from the positioning groove 111, thereby realizing the opening of the cover to facilitate the replacement of printing paper.

[0030] As can be seen from the above, compared with the solution using locking plates in the prior art, this solution uses the deformation of the straight arm portion to make the arc-shaped support portion arranged in an L-shaped protrusion, and uses the L-shaped spring plate to elastically clamp the axial end of the rubber roller to make the rubber roller rotate stably in the positioning groove, and uses the arc-shaped support groove, side retaining wall, deformation limit groove and fixed groove to fix and limit the spring plate, while providing sufficient support and limiting its deformation direction, so that the lock torsion spring can rotate stably in the arrangement plane, so this solution can effectively reduce costs.

Claims

1. A torsion spring locking movement, comprising a thermal sheet, a rubber roller and a seat, wherein the seat is provided with a mounting groove extending in the paper width direction, the mounting groove has mounting side walls at both ends in the paper width direction, the thermal sheet is arranged on the mounting groove, the seat is provided with positioning grooves at both ends of the thermal sheet based on the paper width direction, the positioning grooves are used to mount the axial ends of the rubber roller, the positioning grooves are provided with an opening at the top, the thermal sheet and the rubber roller are opposite to each other and form a paper feeding channel; Features: The mounting side wall is provided with a limiting straight groove on one radial side of the positioning groove, the upper end of the limiting straight groove is connected with the positioning groove, and the mounting side wall is provided with an arc-shaped supporting groove on the lower end of the limiting straight groove, and the positioning groove and the arc-shaped supporting groove are respectively located on both sides of the extension direction of the limiting straight groove; The movement also includes two locking torsion springs, which are extended in an arrangement plane, and the arrangement plane is perpendicular to the paper width direction. The locking torsion spring includes a locking protrusion, a deformation straight arm portion and an arc-shaped support portion connected in sequence. The deformation straight arm portion is arranged in the limiting straight groove, and the locking protrusion portion is located at the opening. The locking protrusion portion protrudes toward the middle of the positioning groove, and the arc-shaped support portion is installed in the arc-shaped support groove with a clearance fit. The deformation straight arm portion can be deformed and moved in the limiting straight groove and on the arrangement plane, and the locking protrusion portion can move toward or away from the positioning groove on the arrangement plane.

2. The movement according to claim 1, characterized in that: The installation side wall is provided with a side retaining wall, the side retaining wall is located on the outer side of the limiting straight groove based on the paper width direction, and the side retaining wall is limitedly matched with the deformable straight arm part.

3. The movement according to claim 1, characterized in that: The mounting side wall is provided with a deformation limiting groove, the deformation limiting groove is located above the limiting straight groove, the deformation limiting groove and the positioning groove are respectively located on both sides of the extension direction of the limiting straight groove, the deformation limiting groove has an upper retaining wall at the upper end, and the deformation limiting groove has a rear retaining wall at the end away from the positioning groove; The first end of the locking protrusion is connected to the deformable straight arm portion, the second end of the locking protrusion is located in the deformation limiting groove, and the upper retaining wall and the rear retaining wall are limitedly matched with the second end of the locking protrusion.

4. The movement according to claim 1, characterized in that: The limiting straight groove and the arc-shaped supporting groove are both arranged on the outer side of the installation side wall based on the paper width direction.

5. The movement according to claim 1, characterized in that: The arc-shaped support portion extends in a semicircular arc.

6. The movement according to any one of claims 1 to 5, characterized in that: The mounting side wall is provided with a fixed card slot, and the fixed card slot and the limiting straight slot are respectively located on both sides of the arc-shaped supporting slot; The lock torsion spring comprises a fixed arm portion, the lock protrusion portion, the deformable straight arm portion, the arc-shaped support portion and the fixed arm portion are connected in sequence, and the fixed arm portion is installed in the fixed card slot with clearance fit.

7. The movement according to claim 6, characterized in that: The extending direction of the fixed slot is perpendicular to the extending direction of the limiting straight slot.

8. The movement according to claim 6, characterized in that: The cross section of the fixed slot is U-shaped.

9. A thermal printer, characterized in that: It comprises a cover body, a base and a movement as claimed in any one of claims 1 to 8, wherein the base body is arranged on the base, the rubber roller is arranged on the cover body, and the cover body and the base are hinged.

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