Ribbon driving structure of printer

Abstract

The utility model discloses a ribbon driving structure of a printer, which comprises a ribbon supply driving mechanism, a ribbon recovery driving mechanism and a cover body, the ribbon supply driving mechanism is provided with a supply end gear, and the ribbon recovery driving mechanism is provided with a recovery end gear; the cover body is provided with a rotating center, an incomplete gear is arranged at the rotating center of the cover body, a connecting gear is arranged between the incomplete gear and the supply end gear, the connecting gear is meshed with the supply end gear, and the cover body has an open state and a closed state. When the cover body is driven to rotate forwards to a second stroke, the cover body can drive the tooth part of the incomplete gear to rotate forwards to leave the connecting gear to form an open state, and when the cover body is driven to rotate forwards to a second stroke, the cover body can drive the tooth part of the incomplete gear to rotate forwards to leave the connecting gear to form a closed state; and the connecting gear can be driven to rotate reversely so as to drive the supply end gear to rotate forwards. And the colored tape is prevented from being broken when the printing head on the cover body presses the colored tape.

Description

Technical Field

[0001] The utility model relates to the technology in the field of printers, in particular to a ribbon driving structure of a printer. Background Art

[0002] When installing the ribbon consumable in the traditional printer, it is necessary to first open the cover, then tighten the ribbon and then close the cover. The cover is provided with a print head. At this time, when closing the cover, since the ribbon is already connected to the motor, under the influence of the static torque of the motor, the ribbon is tightened and difficult to move. At this time, closing the flip cover easily damages or even breaks the ribbon, which improves the operation requirements for construction workers when applying the existing technology printers. The construction workers also need to repair the ribbon consumable to continue using. Therefore, there are problems of easy ribbon damage and great difficulty in completing ribbon installation.

[0003] In the prior art, referring to a ribbon transmission switching structure of a printer disclosed in Chinese Patent CN212499558U, the follower gear on the pivot member on the cover drives the driven gear and the connecting rod. It is a scotch yoke mechanism that converts rotation into linear reciprocating motion. The reciprocating motion disconnects the switching gear when the cover is not fully closed, so that the ribbon driving gear is not driven by the motor, so that the left ribbon can rotate freely. Correspondingly, the whole ribbon is not tightened and not affected by the static torque of the motor at this time, thus solving the problem of easy ribbon breakage in the traditional technology. In this structure, the ribbon is released passively from the ribbon shaft. When the cover is quickly closed, there will still be a problem of excessive tension and breakage of the ribbon. In addition, the scotch yoke mechanism is used for connection, the structure is complex, not conducive to organization, and the position accuracy requirement of the switching gear is high. Inaccurate position will affect the meshing rate of the ribbon driving gear train, further increasing the assembly difficulty.

[0004] Therefore, it is necessary to design a new technical solution to solve the above problems. Summary of the Utility Model

[0005] In view of this, in view of the deficiencies existing in the prior art, the main purpose of the present utility model is to provide a ribbon driving structure of a printer. By arranging an incomplete gear at the rotation center of the cover, and arranging a connecting gear between the incomplete gear and the supply end gear, the connecting gear meshes with the supply end gear. In the closed state of the cover, the tooth part of the incomplete gear can drive the connecting gear to rotate reversely and then drive the supply end gear to rotate forward, so that the supply end gear can actively release the ribbon, and is not affected by the static torque of the motor and the closing speed of the cover, so as to avoid breaking the ribbon when the print head on the cover presses the ribbon. And through the cooperation of the incomplete gear, the connecting gear and the supply end gear, the ribbon can be prevented from being broken. The overall structure is simple, the design is ingenious, and it is easy to assemble.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A ribbon driving structure of a printer, comprising a ribbon supply driving mechanism, a ribbon recovery driving mechanism and a cover body, wherein the ribbon supply driving mechanism is provided with a supply end gear, the ribbon recovery driving mechanism is provided with a recovery end gear, and the cover body is provided with a print head;

[0008] The cover body has a rotation center, and an incomplete gear is arranged at the rotation center of the cover body. A connecting gear is arranged between the incomplete gear and the supply end gear, and the connecting gear is meshed with the supply end gear. The cover body has an open state and a closed state. When the cover body is driven to rotate in the opposite direction to the first stroke, the cover body can drive the tooth portion of the incomplete gear to rotate in the opposite direction to leave the connecting gear to form the open state. When the cover body is driven to rotate forwardly to the second stroke, the cover body can drive the tooth portion of the incomplete gear to rotate forwardly to leave the connecting gear to form the closed state, and the tooth portion of the incomplete gear can drive the connecting gear to rotate in the opposite direction and then drive the supply end gear to rotate forwardly, so that the supply end gear can actively release the ribbon without being affected by the static torque of the motor and the closing speed of the cover body, so as to avoid the ribbon being broken when the print head on the cover body presses the ribbon in, and the ribbon can be avoided from being broken by the cooperation of the incomplete gear, the connecting gear and the supply end gear. The overall structure is simple, the design is ingenious, and it is easy to assemble.

[0009] As a preferred solution, a hook is further provided on the cover body, the hook and the incomplete gear are respectively located at two ends of the cover body, and the print head is located between the hook and the incomplete gear.

[0010] As a preferred embodiment, the cover body includes a transverse portion and a vertical portion protruding from the transverse portion, the hook and the incomplete gear are respectively located at two ends of the transverse portion, an installation portion is provided at one end of the vertical portion away from the transverse portion, and the print head is provided on the installation portion.

[0011] As a preferred solution, a rotating shaft is fixedly provided at the rotation center, and the incomplete gear is fixedly mounted on the rotating shaft.

[0012] As a preferred solution, a first rotation limiting portion is provided on the rotating shaft, and correspondingly, a second rotation limiting portion is provided on the shaft hole of the incomplete gear, and the rotation of the second rotation limiting portion is limited by the first rotation limiting portion.

[0013] As a preferred solution, the ribbon supply drive mechanism and the ribbon recovery drive mechanism both include a driving gear, a driving motor that drives the driving gear to rotate, and a pulley assembly that is transmission-connected to the driving gear, and the supply-end gear and the recovery-end gear are respectively transmission-connected to the corresponding pulley assemblies.

[0014] As a preferred solution, the pulley assembly includes a first pulley, a second pulley, and a belt sleeved outside the first pulley and the second pulley. The first pulley meshes with the driving gear, and the supply-end gear and the recovery-end gear respectively mesh with the corresponding second pulley.

[0015] As a preferred solution, the diameter of the second pulley is larger than that of the first pulley.

[0016] As a preferred solution, an angle detection device for detecting the rotation angle of the driving gear is further provided beside the driving gear.

[0017] As a preferred solution, both the supply-end gear and the recovery-end gear are connected with winding parts for winding the ribbon.

[0018] Compared with the prior art, the present utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solutions:

[0019] Mainly, an incomplete gear is provided at the rotation center of the cover body, and a connecting gear is provided between the incomplete gear and the supply-end gear. The connecting gear meshes with the supply-end gear. In the closed state of the cover body, the tooth part of the incomplete gear can drive the connecting gear to rotate in the reverse direction and then drive the supply-end gear to rotate in the forward direction, so that the supply-end gear can actively release the ribbon, without being affected by the static torque of the motor and the closing speed of the cover body, to avoid breaking the ribbon when the print head on the cover body presses the ribbon into it. And through the cooperation of the incomplete gear, the connecting gear and the supply-end gear, the ribbon can be prevented from being broken. The overall structure is simple, the design is ingenious, and it is easy to assemble.

[0020] To more clearly illustrate the structural features and functions of the present utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram (open state) of a preferred embodiment of the present utility model;

[0022] Figure 2 is another schematic structural diagram of a preferred embodiment of the present utility model;

[0023] Figure 3 is a schematic diagram showing the tooth part of the incomplete gear of a preferred embodiment of the present utility model meshing with the connecting gear;

[0024] Figure 4 is another schematic structural diagram (closed state) of a preferred embodiment of the present utility model.

[0025] Description of the Reference Numerals in the Drawings:

[0026] 10. Ribbon supply drive mechanism 11. Supply end gear

[0027] 20. Ribbon recycling drive mechanism 21. Recycling end gear

[0028] 30. Cover 31. Print head

[0029] 32. Incomplete gear 321. Second rotation limiting part

[0030] 33. Rotating shaft 331. First rotation limiting part

[0031] 34. Hook 301. Rotation center

[0032] 302. Horizontal part 303. Vertical part

[0033] 304. Installation part 40. Driving gear

[0034] 41. Driving motor 50. Pulley assembly

[0035] 51. First pulley 52. Second pulley

[0036] 53. Belt 60. Angle detection device

[0037] 61. Detection part 62. Mounting bracket

[0038] 63. Angle encoder 70. Winding part

[0039] 80. Connecting gear 90. Ribbon Detailed implementation manners

[0040] First of all, it should be noted that in the description of the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0041] Please refer to Figures 1 to 4 as shown, which shows the specific structure of the preferred embodiment of the present utility model, including a ribbon supply drive mechanism 10, a ribbon recycling drive mechanism 20 and a cover 30.

[0042] The ribbon supply drive mechanism 10 is provided with a supply end gear 11, and the ribbon recovery drive mechanism 20 is provided with a recovery end gear 21; the ribbon supply drive mechanism 10 and the ribbon recovery drive mechanism 20 both include a driving gear 40, a driving motor 41 driving the driving gear 40 to rotate, and a pulley assembly 50 connected to the driving gear 40, the supply end gear 11 and the recovery end gear 21 are respectively connected to the corresponding pulley assembly 50, the rotating shaft of the driving motor 41 is connected with a motor gear, and the motor gear is meshed with the driving gear 40;

[0043] Specifically, the pulley assembly 50 includes a first pulley 51, a second pulley 52, and a belt 53 sleeved outside the first pulley 51 and the second pulley 52, the first pulley 51 is meshed with the driving gear 40, the supply end gear 11 and the recovery end gear 21 are respectively meshed with the corresponding second pulley 52, wherein the diameter of the second pulley 52 is greater than the diameter of the first pulley 51;

[0044] In this embodiment, an angle detection device 60 for detecting the rotation angle of the driving gear 40 is also provided on the side of the driving gear 40, and the angle detection device 60 includes a detection unit 61, a mounting frame 62 and an angle encoder 63 arranged on the mounting frame 62, and the detection unit 61 is arranged on the rotating shaft of the driving motor 41; the supply end gear 11 and the recovery end gear 21 are both connected to a winding unit 70 for winding the color ribbon 90, the winding unit 70 of the supply end gear 11 is used to release the color ribbon 90, and the winding unit 70 of the recovery end gear 21 is used to recover the color ribbon 90.

[0045] The cover body 30 is provided with a print head 31, and the cover body 30 has a rotation center 301. The cover body 30 is provided with an incomplete gear 32 at the rotation center 301. A connecting gear 80 is provided between the incomplete gear 32 and the supply end gear 11, and the connecting gear 80 is meshed with the supply end gear 11. The cover body 30 has an open state and a closed state. When the cover body 30 is driven to rotate in the reverse direction to the first stroke, the cover body 30 can drive the tooth portion of the incomplete gear 32 to rotate in the reverse direction to leave the connecting gear 80 to form the open state. When the cover body 30 is driven to rotate in the forward direction to the second stroke, the cover body 30 can drive the tooth portion of the incomplete gear 32 to rotate in the forward direction to leave the connecting gear 80 to form the closed state, and the tooth portion of the incomplete gear 32 can drive the connecting gear 80 to rotate in the reverse direction and then drive the supply end gear 11 to rotate in the forward direction.

[0046] Specifically, a rotating shaft 33 is fixedly provided at the rotation center 301. The incomplete gear 32 is fixedly installed on the rotating shaft 33. A first rotation limiting portion 331 is provided on the rotating shaft 33. Correspondingly, a second rotation limiting portion 321 is provided in the shaft hole of the incomplete gear 32, and the rotation of the second rotation limiting portion 321 is limited by the first rotation limiting portion 331.

[0047] In this embodiment, a hook 34 is further provided on the cover 30. The hook 34 is used to fixedly install the cover 30 on the printer. The hook 34 and the incomplete gear 32 are respectively located at two ends of the cover 30. The print head 31 is located between the hook 34 and the incomplete gear 32. The cover 30 includes a horizontal portion 302 and a vertical portion 303 protruding from the horizontal portion 302. The hook 34 and the incomplete gear 32 are respectively located at two ends of the horizontal portion 302. An installation portion 304 is provided at one end of the vertical portion 303 away from the horizontal portion 302, and the print head 31 is provided on the installation portion 304.

[0048] The working principle of this embodiment is described in detail as follows:

[0049] Figures 1 to 4 The process can be understood as the process of the cover 30 from the open state to the closed state; during the closing process of the cover 30, this rotation direction is defined as the forward rotation, and vice versa for the reverse rotation. When the cover 30 is closed to a specific angle (refer to Figure 3 ), the tooth part of the incomplete gear 32 rotates forward to be in meshing contact with the connecting gear 80, so as to drive the connecting gear 80 to rotate reversely and then drive the supply end gear 11 to rotate forward to actively release the ribbon 90. At this time, the ribbon 90 can start to be actively released, and the print head 31 is not in contact with the ribbon 90. When the cover 30 is completely closed (refer to Figure 4 ), the tooth part of the incomplete gear 32 rotates forward to be separated from the connecting gear 80 and not in contact, so that the incomplete gear 32 does not interfere with the normal operation of the supply end gear 11.

[0050] Figures 4 to 1 The process can be understood as the process of the cover 30 from the closed state to the open state; during the opening process of the cover 30, this rotation direction is the reverse rotation. When the cover 30 is opened to a specific angle (refer to Figure 3 ), the tooth part of the incomplete gear 32 rotates reversely to be in meshing contact with the connecting gear 80, so as to drive the connecting gear 80 to rotate forward and then drive the supply end gear 11 to rotate reversely to actively recover the ribbon 90, avoiding excessive active release of the ribbon 90 by the supply end gear 11 next time and affecting the normal operation of the printer. When the cover 30 is completely opened (refer to Figure 1 ), the tooth part of the incomplete gear 32 rotates reversely to be separated from the connecting gear 80 and not in contact.

[0051] The design focus of the present utility model lies in:

[0052] Specifically, an incomplete gear is provided at the rotation center of the cover body, and a connecting gear is provided between the incomplete gear and the supply end gear. The connecting gear meshes with the supply end gear. In the closed state of the cover body, the tooth part of the incomplete gear can drive the connecting gear to rotate in the reverse direction and then drive the supply end gear to rotate in the forward direction, so that the supply end gear can actively release the ribbon, without being affected by the static torque of the motor and the closing speed of the cover body, so as to avoid breaking the ribbon when the print head on the cover body presses the ribbon into it. Moreover, through the cooperation of the incomplete gear, the connecting gear and the supply end gear, the ribbon can be prevented from being broken. The overall structure is simple, the design is ingenious, and it is easy to assemble.

[0053] The above description is only a preferred embodiment of the present invention, and does not impose any limitation on the technical scope of the present invention. Therefore, any minor modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A ribbon driving structure of a printer, comprising a ribbon supply driving mechanism, a ribbon recovery driving mechanism and a cover body, wherein the ribbon supply driving mechanism is provided with a supply end gear, the ribbon recovery driving mechanism is provided with a recovery end gear, and a print head is provided on the cover body; characterized in that: The cover body has a rotation center, and an incomplete gear is arranged at the rotation center of the cover body. A connecting gear is arranged between the incomplete gear and the supply end gear, and the connecting gear is meshed with the supply end gear. The cover body has an open state and a closed state. When the cover body is driven to rotate in the opposite direction to a first stroke, the cover body can drive the tooth portion of the incomplete gear to rotate in the opposite direction to leave the connecting gear to form the open state. When the cover body is driven to rotate in the forward direction to a second stroke, the cover body can drive the tooth portion of the incomplete gear to rotate in the forward direction to leave the connecting gear to form the closed state, and the tooth portion of the incomplete gear can drive the connecting gear to rotate in the opposite direction and then drive the supply end gear to rotate forwardly.

2. The ribbon driving structure of a printer according to claim 1, characterized in that: The cover body is also provided with a hook, the hook and the incomplete gear are respectively located at two ends of the cover body, and the print head is located between the hook and the incomplete gear.

3. A ribbon driving structure for a printer according to claim 2, characterized in that: The cover body includes a transverse portion and a vertical portion protruding from the transverse portion, the hook and the incomplete gear are respectively located at two ends of the transverse portion, an installation portion is arranged at one end of the vertical portion away from the transverse portion, and the print head is arranged on the installation portion.

4. The ribbon driving structure of a printer according to claim 1, characterized in that: A rotating shaft is fixedly arranged at the rotating center, and the incomplete gear is fixedly mounted on the rotating shaft.

5. The ribbon driving structure of a printer according to claim 4, characterized in that: The rotating shaft is provided with a first rotation limiting portion, and correspondingly, the shaft hole of the incomplete gear is provided with a second rotation limiting portion, and the rotation of the second rotation limiting portion is limited by the first rotation limiting portion.

6. The ribbon driving structure of a printer according to claim 1, characterized in that: The ribbon supply drive mechanism and the ribbon recovery drive mechanism both include a driving gear, a driving motor that drives the driving gear to rotate, and a pulley assembly that is transmission-connected to the driving gear. The supply-end gear and the recovery-end gear are respectively transmission-connected to the corresponding pulley assemblies.

7. The ribbon driving structure of a printer according to claim 6, characterized in that: The pulley assembly includes a first pulley, a second pulley, and a belt sleeved outside the first pulley and the second pulley. The first pulley is meshed with a driving gear, and the supply end gear and the recovery end gear are respectively meshed with the corresponding second pulley.

8. The ribbon driving structure of a printer according to claim 7, characterized in that: The diameter of the second pulley is greater than the diameter of the first pulley.

9. The ribbon driving structure of a printer according to claim 6, characterized in that: An angle detection device for detecting the rotation angle of the driving gear is also arranged on the side of the driving gear.

10. The ribbon driving structure of a printer according to claim 1, characterized in that: The supply end gear and the recovery end gear are both connected with a winding portion for winding the ribbon.

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