KR101246082B1 - Opening and closing apparatus of cover frame for thermal printer - Google Patents

Abstract

The present invention relates to a cover frame opening and closing device of the thermal printer, the present invention is provided with a printer head frame 30 and a printer head 31 and a drive motor 32 having an accommodating portion 12 for storing the roll paper 11 The printer body 10 is assembled and fixed, and the printer body 10 in a state in which the roller frame 40, on which the platen roller 41 is mounted, is fixed to the bottom so that the user can replace the roll paper 11. In the cover frame opening and closing apparatus of the thermal printer including a cover frame 20 provided to be opened and closed through a rotational movement about the rotation center axis 13 for opening and closing on the upper surface, the printer head frame 30 of the A locking member 33 is formed on one side, and a rotating member 60 having a locking hook 62 engaged with the locking jaw 33 to perform a locking and releasing function is disposed on the roller frame 40. Receives external force and assembled in a rotatable structure The locking hook 62 is locked and released from the locking jaw 33 as the cover hook 20 is applied to the external force while the cover frame 20 is a cover of the thermal printer that serves as a lever for opening and closing. It is characterized by providing a frame opening and closing device.

Description

Opening and closing apparatus of cover frame for thermal printer

The present invention relates to a cover frame opening and closing device of the thermal printer, and more specifically to enable the user to open and close the platen roller bundle more conveniently without a separate locking operation button and an additional device for pressing the locking operation button. The present invention relates to a cover frame opening and closing apparatus for a thermal printer, in which a platen roller is opened and closed in a thermal printer to facilitate roll paper replacement.

In general, thermal printers are a type of non-impact printer that uses heat-sensitive recording paper (roll paper), a special paper that reacts to heat, to print and heat the paper with a printhead (thermal head) to display characters and pictures. It is mainly used for printing simple receipts or specifications, and there is a heating element corresponding to a printing dot in the print head itself. When a voltage is applied to the heating element and the current flows, the heating element receives heat and prints on the thermal recording paper. .

Such thermal printers vary in type depending on their shape, and various techniques related thereto are disclosed.

Among them, a common thermal printer includes a housing part for accommodating roll paper having a form in which printing paper is rolled up, and printing is performed by drawing out the roll paper from the housing part. The thermal printer has an opening that is opened and closed by a cover, the roll paper is replaced through the opening, and the inside of the thermal printer is held through the opening.

In particular, upon installation or replacement of the roll paper, the thermal printer needs to manually pull the roll paper out of the housing and set the paper drawn in this way over a predetermined paper path.

Therefore, it is preferable to arrange the printhead on the housing side and to arrange the platen roller disposed at the position opposite to the printhead on the cover side to open and close the opening of the housing.

This structure ensures that the roll paper can be easily placed in the paper path since the platen roller opens the paper path by retracting with the cover when the cover is opened to replace the roll paper.

In particular, guaranteeing print quality in a thermal type printer requires accurate positioning of the platen roller with the print line of the print head and accurate press of the roll paper against the print line of the print head.

For this reason, a locking operation button is usually provided on the cover or head frame side of a conventional thermal printer, and the platen roller is positioned by engaging the housing through a hook.

As such, in the conventional thermal printer, the platen roller can be opened and closed to facilitate roll paper replacement, and a separate locking push button (or hook) or additional devices for pressing the locking operation button are provided. There was a case to be attached.

That is, in the thermal printer of the related art, additional devices capable of operating the locking operation button are sometimes added by lever shafts protruding from the roller frame on which the platen roller is mounted.

Therefore, the printer is caused by an error in machining of the roller frame, an error in attachment of the lever shaft to the roller frame, an error in machining of the head frame, and an error in attachment of the locking shaft to the head frame. Due to the deterioration of the head, there is a problem that poses a potential risk factor to improve the positioning accuracy of the platen roller.

In particular, the increase in the number of parts and the increase in the number of fastening assembly by configuring a separate locking operation button (or hook) and an additional device added to the locking operation button according to the prior art increases the overall productivity and the cost of producing the product. To act as one factor, there was a problem that opening and closing of the cover is cumbersome by using a separate lever shaft.

In addition, in the case of having a structure for opening and closing the cover through a separate locking operation button according to the prior art there was a problem that acts as a restriction in minimizing the size of the product.

Accordingly, the present invention improves and complements the problem of the opening and closing structure of the thermal printer of the type having a separate locking operation button (or hook) to open and close the cover of the conventional thermal printer as described above to install or replace the roll paper. When the cover of the thermal printer can be opened and closed more easily opened and closed.

That is, the present invention by opening and closing the cover frame attached to the platen roller bundle in the thermal printer in a rotational movement around the rotation center axis in the structure for the user to facilitate the replacement and insertion of the roll paper separate locking operation button And as a structure that the cover frame itself performs the role of the opening and closing lever without additional devices can be opened and closed smoothly with a smaller force than the prior art, the purpose is to improve the user convenience.

In addition, the present invention has yet another object to configure to minimize the size of the product by removing the lock operation button and the lever shaft as in the prior art.

The present invention for achieving the above object is a printer main body having a printer head frame and a printer head and a drive motor accommodating the roll is accommodated, and the platen roller is mounted so that the user can replace the roll paper In the cover frame opening and closing device of the thermal printer comprising a cover frame provided to be opened and closed through a rotational movement around the rotation center axis for opening and closing at the upper surface of the printer body is assembled and fixed to the bottom surface, the printer A locking jaw is formed on one side of the head frame, and a rotating member having a locking hook that engages with the locking jaw to perform a locking and releasing function is assembled into a rotatable structure by receiving an external force on the roller frame. The locking hook locks in the locking jaw as the cover frame is applied to the external force. And a release has made its features to provide a frame with cover opening and closing of the thermal printer apparatus in which the cover frame itself performs a role for the opening and closing lever.

Here, according to a preferred embodiment of the present invention, on the edge surfaces of both sides of the print head frame, seating portions that can be engaged with and seated on the platen rollers are formed to face each other. It is formed integrally, and the roller fitting portions for inserting and mounting the platen rollers from the front face are formed on the edge surfaces of both sides of the roller frame, and on both inner circumferential surfaces spaced apart from the roller fitting portions at regular intervals. Each of which is formed, a plurality of boss fastening grooves are assembled in a vertical direction on the plane away from the rotation groove is fitted into the fastening boss formed in the cover frame, the rotation member is fitted on both sides so as to be assembled into the rotation groove, respectively A rotation shaft formed to protrude outward from one side of the edge, and the rotation shaft A hook hook is formed to protrude outward from one side of both side edges at a distance from each other, and engages with a locking jaw on the printhead frame to perform a locking and releasing function, and a protrusion hook is formed on one plane perpendicular to both sides of the hook hook. It is a single member with a rotation lever provided to be able to receive any external force through contact with the fixed pressure member, the rotation member is fitted into the rotation groove through the rotation shaft, and assembled to be rotatable in the roller frame, The fixed pressing member is formed between the plurality of spring seating boss having a threaded hole protruding at a predetermined interval so as to face left and right and the fastening member penetrates through the center thereof, and is formed between the spring seating boss and the pivot lever of the pivot member. It is a single member having a pressing surface to keep in contact with the fixed pressure member. A spring member having an elastic restoring force is inserted and inserted upward from the bottom side and engaged with the fastening boss of the cover frame through the fastening member, and is inserted into and inserted into the body boss fastening groove respectively fitted to the outer circumferential surfaces of the plurality of spring seating bosses. It is characterized by providing a cover frame opening and closing device of a thermal printer.

According to the present invention, by providing a structure in which the cover frame itself performs the opening and closing lever role without a separate opening and closing button and additional device, it can be opened and closed smoothly with a smaller force than the prior art can improve user convenience. In addition, the platen roller bundle can be composed of plastic injection molding to achieve light weight and cost reduction structure.

In addition, the present invention has the effect that can be designed and configured to minimize the size of the product by removing the lock operation button and the lever shaft as in the prior art.

1 is a perspective view showing a state in which a cover frame is coupled to the printer body in a thermal printer according to the present invention in a closed state.
Figure 2 is a perspective view showing a state in which the cover frame in the thermal printer in accordance with the present invention is rotated separated from the printer body open.
Figure 3 is an exploded perspective view showing a state of being assembled separately by the main portion of the thermal printer according to the present invention.
Figure 4 is an exploded perspective view showing the separation of the platen roller bundle of the main components of the present invention.
5 is a perspective view showing a partially coupled state of the platen roller bundle shown in Figure 4 according to the present invention.
Figure 6 and Figure 7 is a schematic view showing a partial cross-sectional configuration of the main portion in the state viewed from the side to show the process of opening and closing the cover frame by the user according to the present invention, respectively.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

At this time, the thickness of the lines or the size of the components shown in the accompanying drawings for explaining the preferred embodiment of the present invention may be exaggerated or omitted for clarity and convenience of description, according to the reference numerals written in the drawings Terms given are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator.

As shown in Figs. 1 to 3, the thermal printer 1 according to the present invention includes an accommodating part 12 in which a roll paper 11 is accommodated, and a printer head 31 and a driving motor 32. A roller having the printer body 10 to which the print head frame 30 is assembled and fixed, and the platen roller 41 is fixed while rotating around the rotation center shaft 13 for opening and closing on the printer body 10. Frame bundle 50 is fixed to have a configuration largely divided into a cover frame 20 provided to be opened and closed so that the user can replace the roll paper (11).

Here, the printer body 10 is provided with an accommodating part 12 having a semi-circular space for accommodating the roll paper 11 at a central portion thereof, and has a rectangular frame shape centering on the accommodating part 12 space. While the front and rear rotation axis 13 is slightly projected to the rear side on both sides of the rectangular frame of the receiving portion 12 while at the same time the printer head frame 30 can be mounted and assembled in front of the receiving portion 12 It has a structure provided with a flat surface.

The cover frame 20 has a lattice structure in which the rear surface is opened and the roll paper 11 is exposed to the outside while being assembled to the upper surface of the printer body 10 so as to be rotatable. The shaft fitting portion 21 is provided to be fixed to the rotation center shaft 13 of the cover frame 20, and a plurality of fastening bosses on which the roller frame bundle 50 can be assembled and fixed on the front upper closed surface ( 22).

Therefore, the thermal printer 1 to which the present invention is applied has the rotational center shaft 13 when the roll paper 11 is installed and replaced with the cover frame 20 assembled to the upper surface of the printer body 10. It has an assembly structure that can rotate open and close the cover frame 20 to the center.

In the thermal printer 1 having such a configuration, the present invention relates to mutually accurate positioning between the platen roller 41 and the print line of the print head 31 and to the print line of the print head 31. It is a feature of the technical configuration to provide a locking structure that can easily open and close the cover frame 20 while considering the mutual positional relationship that can ensure accurate pressurization of the roll paper (11).

In particular, in providing a locking structure that can easily open and close the cover frame 20 as described above, without a separate locking operation button and additional device added to the locking operation button as in the prior art, By providing a fastening structure that can be opened and closed between the roller frame bundle 50 on the cover frame 20 and the print head frame 30, the cover frame 20 itself to perform the opening and closing lever role of the technical configuration Has characteristics.

That is, the present invention includes a printer body 10 having an accommodation unit 12 in which the roll paper 11 is accommodated, and a printer head frame 30 having a printer head 31 and a driving motor 32 are assembled and fixed. In order to allow the user to replace the roll paper 11, the roller frame 40 on which the platen roller 41 is mounted is assembled and fixed on the bottom, and the center of rotation shaft 13 for opening and closing on the upper surface of the printer body 10 is fixed. In the thermal printer (1) comprising a cover frame 20 provided to be opened and closed through a rotational movement around the), the locking step 33 is formed on one side of the print head frame 30, the The rotating member 60 having a locking hook 62 engaged with the locking jaw 33 to perform a locking and releasing function is assembled in a structure that can be rotated by receiving an external force on the roller frame 40. The hook hook 62 hangs as the cover frame 20 is applied to an external force. The locking and release from the jaws (33) made to have a characteristic in that the cover frame (20) providing a frame cover opening and closing device of the thermal printer itself is performing the role lever for opening and closing.

Hereinafter, more specific and preferred embodiments of the present invention will be described in detail.

3 to 5, a seating portion 34 on which the platen roller 41 may be seated is disposed at a position adjacent to the print head 31 on the print head frame 30. The locking jaw 33 is integrally formed at a portion inclined downward through the seating part 34.

Therefore, when the cover frame 20 is coupled to the printer body 10 and the platen roller 41 mounted on the roller frame 40 is seated on the seating portion 34, the print head frame 30 ) Is engaged with the gear train 35 disposed on the roller and the roller gear 45 formed on one side of the platen roller 41, the driving force of the driving motor 32 disposed on the print head frame 30 It is transmitted to the roller gear 45 through the gear train 35 to drive the platen roller 41.

The platen roller bundle 50 mounted and fixed to the cover frame 20 is composed of a roller frame 40, a rotation member 60, a fixed pressure member 70, and a spring member 80.

Here, the roller frame 40 is a member to which the platen roller 41 is mounted and assembled, has a substantially depressed shape, and the platen roller 41 having the roller gear 45 at one end thereof is mounted. The roller fitting part 42 to be provided is provided so as to oppose left and right.

The roller fitting portion 42 has a ring-shaped structure in which one side of the front surface is opened so that the support shafts of both sides of the platen roller 41 can be pushed and fixed at the front surface.

In addition, the rear top surface adjacent to the roller fitting portion 42 is provided with a rotation groove 44 for mounting and assembling the rotation shaft 61 of the rotation member 60, which will be described later. The boss fastening groove 43 is formed to penetrate up and down the rear upper surface of the 44 to provide a space for the spring member 80 to be described later to be fitted, and the fastening boss 22 of the cover frame 20 is fitted. It is provided.

In addition, the rotating member 60 having a shape structure as shown in Figures 3 to 5 is a member that is rotatably assembled on the roller frame 40, the rotating member 60 is the outer side on both sides of the upper end Rotating shaft 61 is formed to protrude into the rotation shaft 61 is inserted into the rotation groove 44 of the roller frame 40 is seated in the center of the rotation member 60 is rotated by the external force It is supposed to act as an axis.

In addition, the hook hook 62 having a substantially triangular cross-sectional structure having a curved surface inclined at one side at a predetermined distance in a downward direction from the pivot shaft 61 on both lower surfaces of the pivot member 60 is rotated with the pivot shaft 61. Side by side protrusions are formed.

The hook hook 62 is mutually coupled with the hooking jaw 33 formed on the frame head frame 30 to be described later as the pivot member 60 is rotated about the pivot shaft 61 by receiving an external force. Repeating and releasing to play a role of performing the lock and release function.

In addition, the rotation member 60 is provided with a rotation lever 63 which is integrally protruded rearward from the rear surface of the rotation member 60 positioned about the middle between the rotation shaft 61 and the locking hook 62.

The rotation lever 63 has a force acting on the fixed pressure member 70 in the state in contact with the pressing surface 71 of the fixed pressing member 70 to be described later to the rotating lever 70 through the pressing surface 71. As it is transmitted to serve to rotate the rotating member 60 to the center of the rotation shaft (61).

The fixed pressing member 70 serves to fasten and fix the platen roller bundle 50 to the cover frame 20 while maintaining a surface contact state with the pivoting lever 63 of the pivot member 60. , The fixed pressing member 70 is formed to protrude at a predetermined interval to face the left and right, and a plurality of spring seating boss 72 having a screw hole penetrated in the center thereof, and the pressure between the spring seating boss 72 The surface 71 has a shape structure formed integrally.

Looking at the fastening assembly structure of the fixed pressure member 70 having the shape structure as described above, the spring member 80 is fitted to each of the outer peripheral surface of the spring mounting boss 72 of the fixed pressure member 70 is seated in this state, When the spring mounting boss 72 of the fixed pressing member 70 is inserted upward from the bottom of the boss fastening groove 43 formed on the roller frame 40, the spring mounting boss 72 is downward from the top of the boss fastening groove 43. It is engaged with the fastening boss 22 of the cover frame 20 to be inserted.

In this state, the platen roller bundle 50 is placed on the cover frame 20 as the fastening member 81, such as a screw, is inserted upward and inserted into a screw hole formed to penetrate through the center of the spring seating boss 72. Fastening will be fixed.

At this time, the spring member 80 is received through the spring seating boss 72 in the boss fastening groove 43 has an elastic restoring force corresponding to the external force applied to the fixed pressure member 70, the fixed pressure When the member 70 maintains a compressed state in the process of pressing and rotating the rotating member 60, when the pressing force by the external force acting on the fixed pressing member 70 is released, the spring member 80 is elastic. The restoring force acts to restore the pivot member 60 to its initial position.

On the other hand, in the process of fastening and assembling the platen roller bundle 50 as described above in the state in which the rotating shaft 61 of the rotating member 60 is fitted into the rotating groove 44 of the roller frame 40 The rotation member 60 does not separate from the roller frame 40 just by mounting the platen roller 41 on which the roller gear 45 is fixed to the roller fitting portion 42 of the roller frame 40. Since it is possible to provide a robust assembly structure that is prevented, as described above, it is possible to prevent the rotation member 60 from being separated from the roller frame 40 only by the mounting of the platen roller 41. ) Has the advantage of not needing a separate fixing part for fixing.

In particular, the rotation shaft 61, which is the rotation center of the rotation member 60, is composed of a shaft separate from the support shaft of the platen roller 41, the printer head frame ( The locking hook 62 is locked and released to the locking jaw 33 of 30 and, as a result, serves to open and close the platen roller bundle 50.

Looking at the operating state of the present invention having the configuration as described above are as follows.

First, in FIG. 6, the close contact of the cover frame 20 to the printer body 10 is completed, and the locking hook 62 of the pivot member 60 is engaged with the locking jaw 33 of the printer head frame 30. It shows the completion status of the mounting which is kept locked.

As described above, in the locked state, the rotation member 60 itself of the unitary structure is applied to the force and external force received while the platen roller 41 is driven. In this case, the spring member 80 is the cover frame. With a structure for tightly pressing both the fixed pressing member 70 and the rotating member 60 mounted on the 20, the spring member 80 simply prevents the rotating member 60 to rotate to the open position. At the same time it serves to prevent the shaking of the cover frame 20 in a locked state.

In particular, in the case of the present invention, the structure is simplified by reducing the number of spring members 80 relatively compared to the conventional use of a separate locking lever.

And, Figure 7 is a diagram showing the detachment process by the user to lift the cover frame 20, when the user grasping the cover frame 20, the fastening boss of the cover frame 20 as shown in FIG. The spring seating boss 72 of the fixed pressing member 70 fastened and fixed to the 22 is pulled in the pulling direction by holding the cover frame 20, and thus the pressing surface 71 of the fixed pressing member 70 is pulled. The end of the rotation lever 63 of the rotation member 60 is pushed up.

Accordingly, the rotation member 60 is rotated about the rotation shaft 61 of the rotation member 60 while being fastened and fixed to the locking step 33 of the printer head frame 30 (locked state of FIG. 6). The locking hook 62 of the rotation member 60 is separated in the rotational direction and separated from the locking jaw 33 while being separated (released state of FIG. 7), thereby opening the platen roller bundle 50. That is, the cover frame 20 will have an open state from the printer body 10).

Then, in contrast to the release state, in the release state shown in FIG. 7, the process of mounting the cover frame 20 to the printer main body 10 in the locked state shown in FIG. 6 (lock state) will be described. When the 20 is pushed in the mounting direction, the rear inclined surfaces of both mounting portions 34 of the print head frame 30 and the engaging hook 62 inclined surfaces of the rotation member 60 come into contact with each other. The rotation member 60, which is subjected to the elastic restoring force, rotates about the rotation shaft 61, and is moved to a position where the locking hook 62 of the rotation member 60 slides down and is engaged with the locking jaw 33. This is going to be done.

Although the above has been shown and described with respect to preferred embodiments of the present invention, the present invention is not limited to the above-described embodiment, it is usually in the field to which the present invention belongs without departing from the spirit of the invention claimed in the claims. Anyone skilled in the art can make various modifications, as well as such modifications that fall within the scope of the appended claims.

1: Thermal printer 10: Printer body
11: roll paper 12: storage
13: center of rotation axis 20: cover frame
21: shaft fitting 22: tightening boss
30: printhead frame 31: printhead
32: drive motor 33: locking jaw
34: seating portion 35: gear train
40: roller frame 41: platen roller
42: roller fitting 43: boss fastening groove
44: rotating groove 45: roller gear
50: roller frame bundle 60: rotating member
61: pivot shaft 62: hook hook
63: rotating lever 70: fixed pressure member
71: pressure surface 72: spring seating boss
80: spring member 81: fastening member

Claims (2)

A printer body 10 having an accommodating portion 12 in which roll paper 11 is accommodated, and a printer head frame 30 having a print head 31 and a driving motor 32 are assembled and fixed, and a user may use roll paper ( 11) Rotational movement around the rotation center axis 13 for opening and closing on the upper surface of the printer body 10 in a state in which the roller frame 40, on which the platen roller 41 is mounted, is fixed to the bottom of the printer body 10 so as to be replaced. In the cover frame opening and closing apparatus of the thermal printer comprising a cover frame 20 provided to be opened and closed through,
A locking member 33 is formed on one side of the print head frame 30, and the rotating member 60 has a locking hook 62 that engages with the locking jaw 33 to perform a locking and releasing function. By receiving an external force on the frame 40 and being assembled in a rotatable structure, the locking hook 62 is locked and released from the locking jaw 33 as the user grabs the cover frame 20 and exerts an external force. The cover frame opening and closing device of the thermal printer, characterized in that the cover frame 20 itself serves to open and close the lever. The method of claim 1,
On the edge surfaces of both sides of the print head frame 30, seating portions 34, which may be engaged with the platen roller 41, may be formed to face each other, and downwardly inclined downwards on the opposite side of the seating portion 34. The locking jaw 33 is formed integrally,
On the edge surfaces of both sides of the roller frame 40, roller fitting portions 42 for pushing and mounting the platen roller 41 from the front side are formed to face each other, and a predetermined distance from the roller fitting portions 42 is provided. Rotating grooves 44 are formed on both inner circumferential surfaces of the side surfaces, and a plurality of boss fastening grooves 43 into which the fastening bosses 22 formed on the cover frame 20 are fitted on a plane separated from the rotating grooves 44. ) Is vertically penetrated,
The rotation member 60 is a rotation shaft 61 protruded outwardly from one side of both side edges so as to be fitted into the rotation groove 44, respectively, and one side edge at a predetermined distance from the rotation shaft 61. A hook hook 62 which is formed to protrude outward from the hook hook 33 on the print head frame 30 to perform a locking and releasing function, and a plane that is perpendicular to both sides of the hook hook 62. It is a single member having a rotation lever 63 formed to protrude from the top and is provided to receive any external force through contact with the fixed pressure member 70, the rotation member 60 is rotated through the rotation shaft 61 Fitted into the groove 44 is assembled rotatably in the roller frame 40,
The fixed pressing member 70 has a plurality of spring seating boss 72 and a plurality of spring seating bosses having a threaded hole protruding from each other so as to face both edge portions and the fastening member 81 penetrates through the center thereof. A single member having a pressure surface 71 formed between the 72 to maintain contact with the rotation lever 63 of the rotation member 60, the fixed pressure member 70 of the boss fastening groove 43 Inserted upward from the bottom is inserted and engaged with the fastening boss 22 of the cover frame 20 via the fastening member 81, the fastening is fixed.
The cover frame opening and closing device of the thermal printer, characterized in that the spring member (80) having an elastic restoring force is inserted into the body boss fastening groove (43) fitted to the outer circumferential surface of the plurality of spring seating boss (72).

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