Thermal printer with cover body torsion spring convenient to assemble

Abstract

The utility model provides a thermal printer with a cover body and torsion springs convenient to assemble, which comprises a base, a cover body, a rubber roller, a thermosensitive sheet and a hinge assembly, a hinge groove of the base is provided with a rotating hole and an insertion hole, a hinge block of the cover body is provided with a mounting groove, the hinge block is provided with a through hole along the paper width direction Y in a penetrating manner, and the hinge assembly comprises a rotating shaft and two torsion springs. Each torsion spring comprises a winding part, a first end part and a second end part, the first end part and the second end part are located at the two ends of the winding part, and the winding part and the first end part of one torsion spring are located in the mounting groove in one side. Then the torsion spring is kept in a relatively stable state, then the second end part is inserted into the insertion hole, and the hinge connection of the cover body, the base and the torsion spring can be conveniently completed by adjusting the position of the cover body and then enabling the rotating shaft to penetrate through the rotating holes in the two sides, the two winding parts and the through hole.

Description

Technical Field

[0001] The utility model relates to the field of thermal printers, and particularly to a thermal printer for conveniently assembling a cover body torsion spring. Background Art

[0002] With the popular application of thermal printers, they are used not only in automatic teller machines in banks, cash registers in supermarkets, e-commerce shipping points, and catering shops, etc. In particular, the printing in the e-commerce industry and the express delivery industry is growing rapidly, and higher requirements are placed on the use stability and operation convenience of printers.

[0003] When replacing the paper roll, it is necessary to open the cover body for replacement. Generally, a torsion spring is required to provide the torsional force for opening the cover body. Therefore, the torsion spring needs to be arranged with a certain pre-torsion force and installed on the cover body and the base. Due to the arrangement of the pre-torsion force, the installation difficulty of the torsion spring will be increased. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a thermal printer for conveniently assembling a cover body torsion spring.

[0005] To achieve the purpose of the utility model, the utility model provides a thermal printer for conveniently assembling a cover body torsion spring, which includes a base, a cover body, a rubber roller, a thermal sheet, and a hinge assembly. The base is provided with a paper bin, the cover body is hinged to the base and covers the paper bin. An outlet is formed between the cover body and the base. 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 body. The thermal sheet and the rubber roller are located on the front side of the paper bin. The thermal sheet and the rubber roller are opposite to each other and form a paper feeding channel, and the paper feeding channel communicates between the outlet and the paper bin. The base is provided with a hinge groove on the rear side of the paper bin. Installation side walls are arranged on both sides of the hinge groove in the paper width direction Y. Each side installation side wall is provided with a rotation hole and a jack. The rotation hole extends along the paper width direction Y, and the jack extends along the vertical direction and is provided with a socket at the upper end. The cover body is provided with a hinge block on the rear side of the paper bin. Installation grooves are arranged on both sides of the hinge block in the paper width direction Y. The hinge block is provided with a through hole extending through in the paper width direction Y, and the through hole communicates between the two side installation grooves. The hinge assembly includes a rotating shaft and two torsion springs. The torsion spring includes a winding part, a first end part, and a second end part. The first end part and the second end part are located at both ends of the winding part. The winding part and the first end part of one torsion spring are located in the installation groove on one side. The first end part abuts against the groove wall of the installation groove. The second end part is inserted into the jack from the socket, and the second end part abuts against the hole wall of the jack. The rotating shaft passes through the two side rotation holes, the two winding parts, and the through hole, and the cover body rotates relative to the base around the rotating shaft.

[0006] A further scheme is that the second end part is arranged in a U shape, the rotation hole is located below the socket, and the U-shaped part of the second end part is located at the socket.

[0007] In a further solution, a notch groove is provided on one side of the socket facing the hinge groove, the notch groove extends along the paper width direction Y, and the U-shaped part of the second end is located in the notch groove.

[0008] In a further solution, the first end is arranged in a U shape, and the U-shaped part of the first end abuts against the groove wall of the installation groove.

[0009] In a further solution, the hinge assembly includes a collar, and the collar is sleeved outside the rotating shaft and located inside the winding part.

[0010] In a further solution, buckling grooves are respectively provided at both ends of the base in the paper width direction Y, the buckling grooves are close to the paper outlet, and an opening is provided above the buckling grooves; the thermal printer further includes a locking part, an elastic part and an opening cover part. The locking part includes two locking arms and a driving plate connected between the two locking arms. The locking part is rotatably hinged on the cover body. A clamping part is provided at the free end of the locking arm. The opening cover part is movably arranged on the cover body. The movement of the opening cover part can drive the rotation of the locking part. The clamping part is detachably engaged with the buckling groove. The elastic part is connected between the locking part and the cover body, and the elastic part applies an elastic clamping force to the clamping part.

[0011] In a further solution, the locking part includes two rotating rods, the rotating rods extend along the paper width direction Y, the rotating rods are connected between the locking arms and the driving plate, and rotating grooves are provided on both sides of the cover body in the paper width direction Y, and one rotating rod is arranged in the rotating groove.

[0012] In a further solution, the elastic part adopts a spring, a butting block is provided on the driving plate, and the spring elastically abuts between the butting block and the cover body.

[0013] In a further solution, an opening cover groove is provided on the upper end surface of the cover body, a through hole is provided through the bottom wall of the opening cover groove, a driving rod body is provided on the opening cover part, and the driving rod body passes through the through hole and is adjacent to the driving plate.

[0014] In a further solution, a buckling hole is provided through the bottom wall of the opening cover groove, a clamping column is provided on the opening cover part, and the clamping column passes through the buckling hole and is engaged with the buckling hole.

[0015] The beneficial effects of the present utility model are as follows: when assembling the torsion spring, the torsion spring can be pre-installed first, that is, the winding part and the first end part of the torsion spring are first installed into the installation groove, and the first end part is abutted against the groove wall of the installation groove, so as to keep the torsion spring in a relatively stable state. Subsequently, the second end part is inserted into the jack, and by adjusting the position of the cover body, then after the rotating shaft passes through the two side rotation holes, the two winding parts and the through hole, the hinged connection of the cover body, the base and the torsion spring can be conveniently completed. Moreover, through the U-shaped arrangement of the end part and the setting of the notch groove, the assembly of the second end part is more stable, and by using the arrangement of the collar, the elastic rotation of the winding part is more stable. Furthermore, through the arrangement of the locking member and in cooperation with the driving plate located in the middle, driven by the cover-opening member, the clamping part can be separated from the buckling groove to realize the opening of the cover body. Then, through the arrangement of the driving column and the clamping column, when the cover-opening member drives the driving plate, the cover-opening member can stably operate in the cover-opening groove. Description of the Drawings

[0016] Figure 1 is a structural diagram of an embodiment of the thermal printer of the present utility model.

[0017] Figure 2 is a structural diagram of an embodiment of the thermal printer of the present utility model from another perspective.

[0018] Figure 3 is a structural diagram of an embodiment of the thermal printer of the present utility model when the cover body is opened.

[0019] Figure 4 is a partial structural diagram of the cover body in an embodiment of the thermal printer of the present utility model.

[0020] Figure 5 is a partial structural diagram of the base in an embodiment of the thermal printer of the present utility model.

[0021] Figure 6 is a cross-sectional view of the rotating shaft in an embodiment of the thermal printer of the present utility model.

[0022] Figure 7 is an exploded view of the cover body in an embodiment of the thermal printer of the present utility model.

[0023] Figure 8 is a cross-sectional view of the lock arm in an embodiment of the thermal printer of the present utility model.

[0024] The present utility model will be further described below in conjunction with the drawings and embodiments. Detailed Embodiments

[0025] Refer to Figures 1 to 8, The thermal printer includes a base 1, a cover 2, a rubber roller 11, and a thermal film 210. The base 1 is provided with a paper bin 2. The cover 2 is hinged to the base 1 and covers the paper bin 2. An outlet 10 is formed between the cover 2 and the base 1. The rubber roller 11 is rotatably arranged on the base 1. The thermal film 210 is arranged on the cover 2. The thermal film 210 and the rubber roller 11 are opposite to each other and form a paper feeding channel. The paper feeding channel communicates between the outlet 10 and the paper bin 2. The thermal film 210 and the rubber roller 11 are located on the front side of the paper bin 12.

[0026] The base 1 includes an outer shell 11 and an inner seat 12. The paper bin 2 and the rubber roller 11 are installed on the inner seat 12. The inner seat 12 is provided with a hinge groove 121 at the rear side of the paper bin 12. The hinge groove 121 is provided with mounting side walls on both sides in the paper width direction Y. Each side mounting side wall is provided with a rotation hole 122 and a jack 123. The rotation hole 122 extends along the paper width direction Y. The jack 123 extends along the vertical direction and is provided with a socket at the upper end. The outer shell 11 is sleeved on the outside of the inner seat 12. The outer shell 11 is provided with a window at the position corresponding to the hinge groove 121. The socket of the jack 123 is provided with a notch groove 124 on the side facing the hinge groove 121. The notch groove 124 extends along the paper width direction Y. The rotation hole 122 is located below the socket.

[0027] The cover 2 includes an outer cover 21 and an inner cover 22. The outer cover 21 covers the outside of the inner cover 22. The thermal film 210 is arranged on the inner cover 22. The inner cover 22 is provided with a hinge block 221 at the rear side of the paper bin 12. The inner cover 22 is provided with extension arms 25 on both sides of the hinge block 221 in the paper width direction Y. The inner seat 12 is provided with a through hole 15 at the position corresponding to the extension arms 25. The extension arms 25 are arranged in an arc shape and extend into the through hole 15. The inside of the extension arms 25 is used for threading and routing of cables.

[0028] The hinge block 221 is provided with mounting grooves 222 on both sides in the paper width direction Y. The hinge block 221 is provided with a through hole 224 penetrating along the paper width direction Y. The through hole 224 communicates between the two mounting grooves 222. The mounting grooves 222 are arranged in a U-shaped groove and are open on the outside in the paper width direction Y.

[0029] The hinge assembly includes a rotating shaft 24, two torsion springs 23, and two collar sleeves 223. The torsion spring 23 includes a winding part 231, a first end part, and a second end part 232. The first end part and the second end part 232 are located at both ends of the winding part 231. The first end part and the second end part 232 are arranged in a U shape. The winding part 231 and the first end part of one torsion spring 23 are located in the mounting groove 222 on one side. The U-shaped part of the first end part abuts against the groove wall of the mounting groove 222. The collar sleeve 223 is assembled in the winding part 231.

[0030] When assembling the cover body 2, the winding part 231 and the first end of the torsion spring 23 can be pre-installed first. Subsequently, the second end 232 is inserted into the jack 123 from the socket. The U-shaped part of the second end 232 is located at the socket and within the notch groove 124. The second end 232 abuts against the inner wall of the jack 123. Then, the position of the cover body 2 is moved, and then the rotating hole 122 and the through hole 224 are coaxially opposite, and the rotating shaft 24 is inserted. The rotating shaft 24 passes through the two-side rotating holes 122, the two winding parts 231, the two collar sleeves 223, and the through hole 224, thus completing the assembly of the torsion spring 23. The cover body 2 rotates relative to the base 1 around the rotating shaft 24.

[0031] At both ends of the base 1 in the paper width direction Y, there are respectively provided fastening grooves 16. The fastening grooves 16 are close to the paper outlet 10. The fastening grooves 16 are provided with openings above. The thermal printer further includes a locking member 27, an elastic member 275, and an open cover member 28. The locking member 27 includes two locking arms 271, two rotating rods 273, and a driving plate 272. The two locking arms 271 and the driving plate 272 connected between the two locking arms 271. The rotating rod 273 extends along the paper width direction Y. The rotating rod 273 is connected between the locking arm 271 and the driving plate 272. The inner cover 22 is provided with rotating grooves 261 on both sides in the paper width direction Y. One rotating rod 273 is arranged in the rotating groove 261. Then, the locking member 27 is rotatably hinged on the cover body 2. The locking arm 271 extends towards the fastening groove 16. The free end of the locking arm 271 is provided with a clamping part 276. The clamping part 276 is arranged in a hook shape. The elastic member 275 is a spring. The driving plate 272 is provided with two abutting blocks 274. One spring elastically abuts between one abutting block 274 and the inner cover 22.

[0032] The outer cover 21 covers above the locking member 27. The outer cover 21 is provided with an open cover groove 211 on the upper end face. The bottom wall of the open cover groove 211 is provided with a through hole 212 and a fastening hole 213 in a penetrating manner. The open cover member 28 is provided with a driving rod body 281 and a clamping column 282. The driving rod body 281 passes through the through hole 212 and is adjacent to the driving plate 272. The clamping column 282 passes through the fastening hole 213 and is engaged with the fastening hole 213, which can prevent the open cover member 28 from detaching from the open cover groove 211. Since the open cover member 28 is movably arranged on the cover body 2, the movement of the open cover member 28 drives the driving rod body 281 to drive the driving plate 272 of the locking member 27 to rotate. The clamping part 276 is detachably engaged with the fastening groove 16. The elastic member 275 is connected between the locking member 27 and the cover body 2. Then, the elastic member 275 applies an elastic fastening force to the clamping part 276 to stably fasten the fastening hole 213.

[0033] Of course, the application of the above-mentioned hinge assembly and open cover mechanism can also be adapted to another model or type of thermal printer. For example, the thermal paper is arranged on the base, and the rubber roller is rotatably arranged on the cover body. The invention purpose of this case can also be achieved by applying the paper clamping assembly of this case to such printers.

[0034] As can be seen from the above, when assembling the torsion spring, the torsion spring can be pre-installed first, that is, the winding part and the first end part of the torsion spring are first installed in the installation groove, and the first end part is abutted against the groove wall of the installation groove, so as to keep the torsion spring in a relatively stable state. Subsequently, the second end part is inserted into the jack, and by adjusting the position of the cover body, and then passing the rotating shaft through the two side rotating holes, the two winding parts and the through hole, the hinged connection of the cover body, the base and the torsion spring can be conveniently completed.

Claims

1. A thermal printer for conveniently assembling a cover body torsion spring, comprising a base, a cover body, a rubber roller, a thermal sheet and a hinge assembly. The base is provided with a paper bin. The cover body is hinged to the base and covers the paper bin. An outlet for paper is formed between the cover body and the base. 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 body. The thermal sheet and the rubber roller are located on the front side of the paper bin. The thermal sheet and the rubber roller are opposite to each other and form a paper feeding channel, and the paper feeding channel communicates between the outlet for paper and the paper bin; It is characterized in that: The base is provided with a hinge groove at the rear side of the paper bin. The hinge groove is provided with mounting side walls on both sides in the paper width direction Y. Each mounting side wall is provided with a rotation hole and a jack. The rotation hole extends along the paper width direction Y, and the jack extends along the vertical direction and is provided with a socket at the upper end; The cover body is provided with a hinge block at the rear side of the paper bin. The hinge block is provided with mounting grooves on both sides in the paper width direction Y. The hinge block is provided with a through hole extending through in the paper width direction Y, and the through hole communicates between the two mounting grooves on both sides; The hinge assembly includes a rotating shaft and two torsion springs. The torsion spring includes a winding part, a first end part and a second end part. The first end part and the second end part are located at both ends of the winding part. The winding part and the first end part of one torsion spring are located in the mounting groove on one side. The first end part abuts against the groove wall of the mounting groove. The second end part is inserted into the jack from the socket, and the second end part abuts against the hole wall of the jack. The rotating shaft passes through the two rotation holes, the two winding parts and the through hole on both sides, and the cover body rotates relative to the base around the rotating shaft.

2. The thermal printer according to claim 1, characterized in that: The second end part is arranged in a U shape. The rotation hole is located below the socket, and the U-shaped part of the second end part is located at the socket.

3. The thermal printer according to claim 2, characterized in that: The socket is provided with a notch groove on the side facing the hinge groove. The notch groove extends along the paper width direction Y, and the U-shaped part of the second end part is located in the notch groove.

4. The thermal printer according to claim 2, characterized in that: The first end part is arranged in a U shape, and the U-shaped part of the first end part abuts against the groove wall of the mounting groove.

5. The thermal printer according to claim 1, characterized in that: The hinge assembly includes a collar, and the collar is sleeved outside the rotating shaft and is located inside the winding part.

6. The thermal printer according to any one of claims 1 to 5, characterized in that: The base is respectively provided with fastening grooves at both ends in the paper width direction Y. The fastening grooves are close to the outlet for paper, and the fastening grooves are provided with openings at the upper part; The thermal printer further includes a locking member, an elastic member, and an opening member. The locking member includes two locking arms and a driving plate connected between the two locking arms. The locking member is rotatably hinged to the cover body. A clamping portion is provided at the free end of the locking arm. The opening member is movably provided on the cover body, and the movement of the opening member can drive the rotation of the locking member. The clamping portion is detachably engaged with the engaging groove. The elastic member is connected between the locking member and the cover body, and the elastic member applies an elastic clamping force to the clamping portion.

7. The thermal printer according to claim 6, wherein: The locking member includes two rotating rods. The rotating rods extend along the paper width direction Y. The rotating rods are connected between the locking arms and the driving plate. Rotating grooves are provided on both sides of the cover body in the paper width direction Y, and one of the rotating rods is arranged in the rotating groove.

8. The thermal printer according to claim 7, wherein: The elastic member is a spring. The driving plate is provided with an abutting block, and the spring elastically abuts between the abutting block and the cover body.

9. The thermal printer according to claim 6, wherein: The cover body is provided with an opening groove on the upper end surface. A through hole is provided through the bottom wall of the opening groove. The opening member is provided with a driving rod body, and the driving rod body passes through the through hole and abuts against the driving plate.

10. The thermal printer according to claim 9, wherein: A fastening hole is provided through the bottom wall of the opening groove. The opening member is provided with a clamping column, and the clamping column passes through the fastening hole and is engaged with the fastening hole.

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