Printing mechanism of medical monitoring device and medical monitoring device

Abstract

The present invention provides a printing mechanism for a medical monitoring device and a medical monitoring device. The printing mechanism includes a movable frame assembly having a frame, and a paper drawer for holding paper, attached to the frame and moving with the movable frame assembly. The front end wall of the paper drawer is formed as a curved wall having a first portion extending perpendicularly from the front end of the paper drawer's bottom plate and a second portion extending from the first portion and bent toward the rear end of the paper drawer relative to the first portion, the second portion forming an anti-tilt surface for preventing the paper from tilting. According to the printing mechanism for a medical monitoring device of the present invention, the edge of the paper in contact with the anti-tilt surface does not slip or tilt during printing, without affecting the smoothness of feeding the paper to the print head.

Description

[Technical field]

[0001] The present invention relates to a printing mechanism for a medical monitoring device, and to a medical monitoring device having such a printing mechanism. [Background technology]

[0002] A medical monitoring device, such as a fetal monitor, an electrocardiograph, a defibrillator, or an ultrasound diagnostic device, generally has a main unit and a printing mechanism disposed in the main unit. In the case of the printing mechanism of a fetal monitor, for example, stacked thermal printing papers are usually accommodated in a printing paper drawer. When the printing mechanism operates, a rubber platen driven by a stepping motor rotates at a preset speed, pulling the printing papers past the thermal printing head, and recording a curve that characterizes the characteristics of the life of the fetus on the thermal printing paper. The medical monitoring device can operate in a horizontally arranged state, but in some cases, the medical monitoring device needs to operate in a vertically suspended state. When the medical monitoring device operates in a vertically suspended state, if no measures are taken, the stacked thermal printing papers that meet the standards of a medical monitoring device, such as a fetal monitor, may tilt as a whole, which may affect the smoothness of feeding the printing papers by the thermal printing head, and in more serious cases, may cause a paper jam.

[0003] Therefore, there is a need to improve upon existing printing mechanisms in medical monitoring devices. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PRESENT EMBODIMENT It is an object of the present invention to provide a printing mechanism for a medical monitoring device that can overcome at least one of the above-mentioned drawbacks in the prior art. [Means for solving the problem]

[0005] According to one aspect of the present invention, a movable frame assembly having a frame; and a paper drawer mounted on said frame for moving with said movable frame assembly for holding a paper sheet; a printing mechanism for a medical monitoring device having a The front end wall of the printing paper drawer is a first portion extending perpendicularly from a front end of the bottom plate of the print paper drawer; and a second portion extending from the first portion and bending relative to the first portion toward a rear end of the paper drawer; and the second portion is formed as a curved wall having a first portion and a second portion forming an anti-tilt surface for preventing the printing paper from tilting.

[0006] Preferably, the second portion may be bent at an angle of 20° to 25° relative to the first portion.

[0007] Preferably, the front end wall has two front end wall portions extending respectively from the first and second side walls of the print paper drawer such that a space is formed between said front end wall portions.

[0008] Preferably, the paper drawer may further include a loading ramp extending outwardly from an upper edge of the first portion, which may be formed as an arched surface gradually descending towards the bottom plate of the paper drawer.

[0009] Preferably, the printing mechanism comprises: a shaft rotatably mounted at the front end of the paper drawer; a push-up bar mounted on the shaft and adapted to rotate with the shaft; and An operating handle attached to the shaft for driving the shaft to rotate The paper lifting mechanism further includes a lifting bar having a lifting rod that is received in the opening of the bottom plate or that can rotate with the shaft and pass through the opening of the bottom plate.

[0010] Preferably, the paper lifting mechanism further includes a reset spring attached to the operating handle for returning the operating handle to its initial position.

[0011] Preferably, a silicone sleeve may be provided at the end of the push rod.

[0012] Preferably, the printing mechanism comprises: Support plate, a support arm having a print head thereon and disposed on said support plate, the movable frame assembly further including a rubber platen attached to a front end of the frame adjacent an exterior of the medical monitoring device and adapted to contact the print head under pressure; and A drive mechanism for driving the rubber platen to rotate. the movable frame assembly is on a support plate and is movably disposed between the support plate and the support arm.

[0013] Preferably, the printing mechanism further includes a locking mechanism having a pair of elastic clamping claws arranged opposite to each other at the rear end of the frame, and a locking post arranged on the support plate corresponding to the elastic clamping claws, the elastic clamping claws engage (clamp) with each other, the elastic clamping claws open under an external pushing force, receive the locking post and securely fasten the locking post, and the elastic clamping claws disengage from the locking post under an external pulling force.

[0014] Preferably, the drive mechanism may include a first pulley fixedly mounted to one end of the rubber platen, an electric motor mounted to the frame, a second pulley mounted to a rotating shaft of the electric motor, and a timing belt connecting the first pulley and the second pulley so as to drive the rubber platen to rotate when the electric motor is operated, the electric motor being disposed at a rear end of the frame adjacent to an inner side of the medical monitoring device.

[0015] Preferably, the support arm is L-shaped, one end of the support arm is rotatably mounted to the support plate and the other end of the support arm comprises a print head mounting portion, and the print head is mounted on the print head mounting portion. The print head is mounted on the print head mounting portion.

[0016] Preferably, the frame can have a first mounting plate and a second mounting plate arranged opposite each other, and a first connecting plate and a second connecting plate which fixedly connect the first mounting plate and the second mounting plate to each other, the first mounting plate having a first guide slot extending along the longitudinal direction, the second mounting plate having a second guide slot extending along the longitudinal direction, and both ends of the print head mounting portion being movably supported in the first guide slot and the second guide slot.

[0017] Preferably, the medical monitoring device is a fetal monitor.

[0018] According to another aspect of the present invention, there is provided a medical monitoring device including a medical monitoring device printing mechanism as described above.

[0019] In the printing mechanism of the medical monitoring device of the present invention, an anti-tilt surface that prevents the printing paper from tilting is disposed at the front end of the printing paper drawer, and even when the medical monitoring device is operated in a vertically suspended state, the end of the printing paper in contact with the anti-tilt surface will not slip or tilt during printing, while not affecting the smoothness of feeding the printing paper to the print head, thereby ensuring normal operation of the printing mechanism. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 shows, in a perspective view, a schematic representation of a printing mechanism of a medical monitoring device according to the invention. [Diagram 2] FIG. 2 shows, in perspective view, a schematic representation of a movable frame assembly of a printing mechanism of a medical monitoring device according to the present invention, with an electric motor and a rubber platen mounted to the frame. [Diagram 3] FIG. 3 shows a schematic perspective view of the printing mechanism of a medical monitoring device according to the present invention with the support arm, print head mount and rubber platen removed to clearly show the paper feed. [Figure 4] FIG. 4 is a top view of the structure shown in FIG. [Diagram 5] FIG. 5 is an enlarged partial view of FIG. 4 showing the locking post clamped by the resilient clamping claw. [Figure 6] FIG. 6 is an enlarged partial view of FIG. 4 showing the locking post held by the resilient clamping claw in a locked position. [Figure 7] FIG. 7 is a cross-sectional view showing the structure of the printing mechanism. [Figure 8] FIG. 8 is a perspective view of a print paper drawer in which a paper lifting mechanism is attached to the print paper drawer. [Figure 9] FIG. 9 is another perspective view of the print paper drawer with the paper lifting mechanism removed from the print paper drawer. [Figure 10] FIG. 10 is a cross-sectional view taken along line 10-10 of FIG. [Figure 11]FIG. 11 is another perspective view from the bottom of the print paper drawer with the paper lifting mechanism attached to the print paper drawer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Preferred embodiments of the present invention are described in detail below with reference to the drawings, which should be understood by those skilled in the art that the drawings are only intended to illustrate the present invention and are not intended to create any limitations on the present invention.

[0022] FIG. 1 shows a schematic perspective view of a printing mechanism of a medical monitoring device according to the present invention. As shown in FIG. 1, the printing mechanism 1 of the medical monitoring device according to the present invention generally comprises a support plate (or base plate) 3 that is typically mounted on a housing of a medical monitoring device (not shown), such as, for example, a fetal monitor. The printing mechanism 1 of the medical monitoring device according to the present invention further comprises a support arm 5. In a preferred embodiment, the support arm 5 is substantially L-shaped, one end 5a of the support arm 5 is rotatably mounted on the support plate 3, and the other end 5b of the support arm 5 comprises a print head mounting part 7 on which a print head, for example a thermal print head, is mounted. In FIG. 1, the print head is not visible, since it is mounted below the print head mounting part 7. The print head is in electrical communication with the main unit of the medical monitoring device, by wire or wirelessly, and thus receives signals from the main unit and performs printing operations. The printing mechanism 1 of the medical monitoring device according to the invention also comprises a movable frame assembly 9 which rests on the support plate 3 and is arranged movably in the space between the support plate 3 and the support arm 5 .

[0023] FIG. 2 shows a schematic perspective view of a movable frame assembly of a printing mechanism of a medical monitoring device according to the present invention, in which an electric motor and a rubber platen are mounted to the frame. As shown in FIG. 2, the movable frame assembly 9 includes a frame 11. The frame 11 includes a first mounting plate 13 and a second mounting plate 15 arranged opposite each other, and a first connecting plate 17 and a second connecting plate 19 fixedly connecting the first mounting plate 13 and the second mounting plate 15 to each other. In a preferred embodiment, the first mounting plate 13, the second mounting plate 15, the first connecting plate 17 and the second connecting plate 19 are metal members, e.g., aluminum or other lightweight metal, or alloy members, which are formed separately and then connected to each other by fasteners, e.g., screws, such that the frame 11 is formed as a rigid metal frame. However, it should be understood that the first mounting plate 13, the second mounting plate 15, the first connecting plate 17 and the second connecting plate 19 can also be integrally cast from metal. Of course, the first mounting plate 13, the second mounting plate 15, the first connecting plate 17 and the second connecting plate 19 could also be integrally molded from plastic. The movable frame assembly 9 also has a paper drawer 16 mounted between the first mounting plate 13 and the second mounting plate 15 for holding paper 18. In Figure 2, this paper drawer 16, which is attached to the frame 11, is not shown.

[0024] The movable frame assembly 9 also includes a rubber platen 21, the ends of which are rotatably supported on the first and second mounting plates 13, 15. The rubber platen 21 is rotatably supported by bearings at the front ends of the first and second mounting plates 13, 15 adjacent the exterior of the medical monitoring device, and a first pulley 23 is fixedly attached to one end of the rubber platen 21. The movable frame assembly 9 also includes an electric motor 25 mounted to the first mounting plate 13 and spaced apart from the rubber platen 21 along the length of the first mounting plate 13, and a second pulley (not shown) attached to a rotating shaft of the electric motor 25. The timing belt 27 is connected to the first and second pulleys such that when the electric motor is operated, it drives the rubber platen 21 to rotate using the second pulley, timing belt 27 and first pulley 23. Therefore, according to the present invention, the rubber platen 21, the electric motor 25, and the timing belt 27 connecting the rubber platen 21 and the electric motor 25 are all attached to the frame 11. In this way, even if the movable frame assembly 9 is pulled out of the housing of the medical monitoring device, printing paper is picked up and replenished, and then the movable frame assembly 9 is inserted into the housing of the medical monitoring device 13, the rubber platen 21, the electric motor 25, and the timing belt 27 move with the frame, but their relative positions do not change, thus ensuring that they are accurately positioned, thereby allowing the printing mechanism to operate smoothly without generating noise or with greatly reduced noise generation.

[0025] Preferably, the electric motor 25 is located at the rear end of the first mounting plate 13 adjacent the inside of the medical monitoring device, which allows the movable frame assembly 9 to be formed with a substantially uniform thickness, and therefore with a relatively flat and regular shape. As a result, the printing mechanism can have a relatively compact and regular layout. More preferably, the first pulley 23, the second pulley and the electric motor 25 are all located adjacent the first mounting plate 13, making the overall structure more compact and occupying as little space as possible. The first mounting plate 13 and the second mounting plate 15 are sized such that the rubber platen 21, the first pulley on the rubber platen 21, the timing belt 27, the electric motor 25 and the second pulley on the electric motor 25 are all located inside at least one of the first mounting plate 13 and the second mounting plate 15, ensuring that these movable components do not protrude from the frame 11 or are exposed outside the frame 11. While the first mounting plate 13 and the second mounting plate 15 could be the same length, in a preferred embodiment, the length of the second mounting plate 15 can be shorter than the length of the first mounting plate 13 because the second mounting plate 15 does not need to support the electric motor 25, thereby reducing the amount of material used and the weight of the frame 11. In the above preferred embodiment, the drive mechanism for driving the rubber platen to rotate includes an electric motor, a first pulley, a second pulley, and a timing belt, but the drive mechanism for driving the rubber platen to rotate may have other configurations, such as a configuration including an electric motor attached to a frame that drives a rubber platen attached to a frame by meshing gears.

[0026] A first guide slot 29 and a second guide slot 31 extending along the longitudinal direction are formed in the first mounting plate 13 and the second mounting plate 15, respectively. Both ends 7a, 7b of the print head mounting portion 7 are movably supported by the first guide slot 29 and the second guide slot 31, respectively.

[0027] Figure 3 shows diagrammatically a perspective view of the printing mechanism of the medical monitoring device of the present invention, in which the support arm, print head mount and rubber platen have been removed to clearly show the paper drawer, and Figure 4 is a top view of the structure shown in Figure 3. Clearly shown in Figure 3 is paper drawer 16 for holding paper 18. This paper drawer 16 may be moulded from plastic and may be fixedly supported on frame 11, for example by snaps, screws or other fastening means, and may move with frame 11 or movable frame assembly 9.

[0028] The printing mechanism 1 of the medical monitoring device according to the present invention further comprises a locking mechanism having a first locking member 33 provided on the outside of the second connecting plate 19 of the frame 11 (i.e. the rear side of the frame 11 facing the inside of the housing of the medical monitoring device) and a second locking member 35 provided on the support plate 3. When the frame 11 with the print paper drawer 16 is pushed into the housing of the medical monitoring device, the first locking member 33 and the second locking member 35 can engage with each other under an external pushing force, thereby locking the movable frame assembly 9 and the print paper drawer 16 in a predetermined position in the housing of the medical monitoring device. When the frame 11 with the print paper drawer 16 is pulled outward from the housing of the medical monitoring device, the first locking member 33 and the second locking member 35 can disengage from each other under an external pulling force, thereby allowing the movable frame assembly 9 and the print paper drawer 16 to be pulled outward from the housing of the medical monitoring device.

[0029] In a preferred embodiment as shown in Figures 3 and 4, the first locking member 33 has a pair of resilient clamping claws 37 arranged opposite to each other, and these resilient clamping claws 37 engage with each other. The second locking member 35 has a locking post 39 arranged on the support plate 3 corresponding to the resilient clamping claws 37. When the frame 11 with the print paper drawer 16 is pushed into the housing of the medical monitoring device, the resilient clamping claws 37 open under an external pushing force, receive the locking post 39, and then fasten the locking post 39, thereby locking the print paper drawer 16 in a predetermined position in the housing of the medical monitoring device, as shown in Figures 5 and 6. When the frame 11 with the print paper drawer 16 is pulled outward from the housing of the medical monitoring device, the resilient clamping claws 37 disengage from the locking post 39 under an external pulling force, thereby allowing the print paper drawer 16 to be pulled outward from the housing of the medical monitoring device.

[0030] In order to securely hold the locking post 39 by the pair of elastic clamping claws 37, each of the elastic clamping claws 37 is formed with a wrap portion 37a that curves outward and then inward. The two oppositely arranged wrap portions 37a preferably form a () or <> shape to hold the locking post 39. Furthermore, each of the elastic clamping claws 37 may further have a guide portion 37b that curves outward again from the wrap portion 37a. The two oppositely arranged guide portions 37b are preferably trumpet-shaped to guide the locking post 39 into the space between the two wrap portions 37a. Although the locking post 39 may be cylindrical, the two side surfaces of the locking post 39 are preferably inclined, and the two planes 39a formed by the inclined side surfaces converge toward the print paper drawer 16, which further helps to guide the locking post 39 into engagement with the pair of elastic clamping claws 37.

[0031] According to the locking mechanism of the preferred embodiment of the present invention, when the paper drawer 16 is about to be fully closed, the inner wall of the wrap portion 37a of the resilient clamping claw 37 exerts a pushing force on the locking post 39, which serves to push the paper drawer 16 into the housing. After the paper drawer 16 is fully closed, the resilient clamping claw 37 returns to a predetermined state and produces a "click" sound, providing feedback to the user that the paper drawer 16 is fully closed.

[0032] In the preferred embodiment shown in Figures 3 and 4, there are two pairs of resilient clamping claws 37 and two corresponding locking posts 39. It is understood that it is possible to have only one or more pairs of resilient clamping claws 37 and corresponding locking posts 39. It is also feasible to have a pair of resilient clamping claws arranged on the support plate 3 and a locking post 39 arranged on the frame 11.

[0033] Under normal conditions, the movable frame assembly 9 is inserted into the space between the support plate 3 and the support arm 5 in the housing of the medical monitoring device such that the print head at the print head mount 7 is under pressure and in contact with the rubber platen 21. The print paper 16 can pass between the rubber platen 21 and the print head. When the printing mechanism is in operation, the electric motor 25 drives the rubber platen 21 to rotate using the second pulley, the electric motor 25 and the first pulley 23, thereby pulling the thermal print paper past the print head and recording on the print paper a curve characterizing the vital characteristics of the fetus.

[0034] When the movable frame assembly 11 is pulled outwardly to pick up and refill the printing paper, the resilient clamping claws 37 are disengaged from the locking posts 39 under an external pulling force, thereby moving the printing paper drawer out of the housing of the medical monitoring device for picking up and refilling the printing paper. After picking up and refilling the printing paper, the resilient clamping claws 37 are opened under an external pushing force to receive the locking posts 39 and then securely fasten the locking posts 39, thereby locking the printing paper drawer 16 in place within the housing of the medical monitoring device.

[0035] The printing mechanism according to the present invention has a small number of parts and is simple to design and assemble. In use, the user can open and close the paper drawer with only one hand without any additional pressing or significant effort. Moreover, the paper drawer can be reliably pushed and pulled without wobbling, and a stable and reliable lock can be achieved.

[0036] FIG. 7 is a cross-sectional view showing the structure of the printing mechanism, FIG. 8 is a perspective view of the print paper drawer with the paper lifting mechanism attached to it, FIG. 9 is another perspective view of the print paper drawer with the paper lifting mechanism removed from it, FIG. 10 is a cross-sectional view taken along line 10-10 of FIG. 9, and FIG. 11 is another perspective view of the print paper drawer from the bottom with the paper lifting mechanism attached to it. The print paper drawer 16 may be molded from plastic. As shown in FIGS. 3, 4 and 7 and described above, the print paper drawer 16 is fixedly supported by the frame 11, for example by snaps, screws or other fastening means, and may move with the frame 11 or the movable frame assembly 9.

[0037] As shown in Figures 8 to 11, the print paper drawer 16 is substantially drawer-shaped and has a bottom plate 16a, a first side wall 16b and a second side wall 16c extending vertically from both sides of the bottom plate 16a, a rear end wall 16d extending vertically from the rear end of the bottom plate 16a, and a front end wall 16e formed at the front end of the bottom plate 16a. The rear end of the bottom plate 16a refers to the end of the bottom plate 16a facing the inside of the housing of the medical monitoring device. The front end of the bottom plate 16a refers to the end of the bottom plate 16a facing the outside of the housing of the medical monitoring device, i.e., the end adjacent to the rubber platen 21. According to the present invention, the front end wall 16e of the print paper drawer 16 is a curved wall, not a straight wall. The curved wall has a first portion 16e1 extending perpendicularly from the front end of the bottom plate 16a, and a second portion 16e2 extending from the first portion 16e1 and curving toward the rear end relative to the first portion 16e1. The second portion 16e2 forms an anti-tilt surface for preventing the printing paper from tilting.

[0038] When the printing mechanism is hung vertically and the front end wall 16e of the print paper drawer 16 faces downwards, even if print paper is added to the print paper drawer, the bottom of the stacked print paper contacts the tilt prevention surface which exerts an obliquely upward force on the print paper. The resultant force of this obliquely upward force and the gravity of the print paper is directed toward the bottom plate 16a of the print paper drawer so that the end of the print paper in contact with the tilt prevention surface does not slip or tilt during printing, while not affecting the smoothness of feeding the print paper to the print head. Preferably, the second portion 16e2 is bent at an angle α of 20° to 25° with respect to the first portion 16e1.

[0039] The front end wall 16e extends from the first side wall 16b to the second side wall 16c, but preferably has front end wall portions that extend a certain length from the first side wall 16b and the second side wall 16c, but do not extend from the first side wall 16b to the second side wall 16c. In this way, a space 16f is formed between the two front end wall portions, so that a user can pick up and replenish printing paper through the space 16f.

[0040] A loading ramp 16g extending outward from the upper end of the first portion 16e1 may also be disposed at the front end of the print paper drawer 16. This loading ramp 16g may be formed as an arched surface gradually descending toward the bottom plate 16a of the print paper drawer 16. When the printing mechanism is in a horizontally disposed state, the user places one end of the regularly folded print paper on the loading ramp 16g, and then slightly pushes the other end, so that the stacked print paper slides along the loading ramp 16g to a predetermined position in the print paper drawer under the influence of gravity, without the user needing to push the print paper completely into the print paper drawer by hand.

[0041] The printing mechanism according to the present invention may further comprise a paper lifting mechanism 41 having a shaft 43 and two lifting bars 45 mounted on the shaft 43. The two lifting bars 45 may rotate together with the shaft 43. It should be understood that the lifting bars 45 may be one or more. In a preferred embodiment, the shaft 43 and the lifting bars 45 are integrally formed by injection molding. The shaft 43 is rotatably mounted at the front end of the paper drawer 16. In a preferred embodiment, an opening ring 16h is formed at the front end of the paper drawer 16, and the shaft 43 may be fitted into the opening ring 16h so as to be rotatably received within the opening ring 16h. It should be understood that the shaft 43 may be rotatably mounted at the front end of the paper drawer 16 by any other suitable method. The paper lifting mechanism 41 also comprises an operating handle 47 which passes through a mounting plate of the frame 11 and is attached to the shaft 43. One end of a return spring 49 is attached to the operating handle 47, and the other end of the return spring 49 is attached to the frame 11 or the print paper drawer 16. The bottom plate 16a of the print paper drawer 16 has an opening 16a corresponding to the push-up rod 45. i The opening 16 is formed. i 4. The push rod 45 may be used to accommodate or allow the push rod 45 to pass through the opening.

[0042] In the existing printing mechanism, the user needs to grab the printing paper by hand through the gap between the printing paper drawer and the printing paper. However, this gap is generally very small, so it is very inconvenient for the user to replace the printing paper. According to the present invention, when the user needs to replace the printing paper or adjust the condition of the printing paper in the printing paper drawer, the movable frame assembly on which the printing paper drawer is mounted is first pulled outward from the housing of the medical monitoring device, and the operating handle 47 is rotated to drive the shaft 43 and the push-up bar 45 to rotate, so as to push up the push-up bar 45 from the bottom plate 16a of the printing paper drawer 16 so as to push up the printing paper upward and outward, thereby facilitating the user to replace the printing paper. A silicone sleeve 51 may be provided at the end of the push-up bar 45. The silicone sleeve 51 may further pull the printing paper toward the front end (exit) of the printing paper drawer as the push-up bar 45 rotates, thereby allowing the printing paper to be fed out. When the operating handle 47 is released, it returns to its initial position under the action of a return spring 49, thus possibly driving 45 back into the opening 16i or into a position below the base plate 16a.

[0043] According to the present invention, by appropriately selecting the length, width and height of the printing paper drawer, a balance can be achieved between compact restriction of printing paper movement and smooth insertion and removal of printing paper, and a good balance can be achieved between compact restriction of printing paper movement and smooth ejection of printing paper.

[0044] Although the present invention has been described in detail in connection with the preferred embodiments, it should be understood that such detailed description is intended to only illustrate the present invention and not to limit the present invention. For example, the first locking member can be provided as a shaft, and the second locking member can be provided as a sleeve for receiving the shaft, and the shaft and the sleeve can be releasably engaged with each other by frictional force. Therefore, the scope of the present invention is defined by the technical solutions in the claims.

Claims

1. a movable frame assembly having a frame; and a paper drawer attached to said frame and moving with said movable frame assembly for holding a paper sheet; 1. A printing mechanism for a medical monitoring device, comprising: The front end wall of the printing paper drawer is a first portion extending perpendicularly from a front end of the bottom plate of the print paper drawer; and a second portion extending from the first portion and bent toward a rear end of the paper drawer relative to the first portion; [0033] The curved wall has a A printing mechanism for a medical monitoring device, wherein the second portion forms an anti-skew surface for preventing skew of the print paper.

2. The printing mechanism of claim 1 , wherein the second portion is angled at an angle of between 20° and 25° relative to the first portion.

3. 2. The printing mechanism of claim 1, wherein said front end wall has a first wall portion and a second wall portion such that a space is formed between two front end wall portions extending from first and second side walls of said print paper drawer, respectively.

4. 2. The printing mechanism of a medical monitoring device of claim 1, wherein the paper drawer further includes a loading ramp extending outwardly from a top end of the first portion, the loading ramp being formed as an arched surface gradually descending toward a bottom plate of the paper drawer.

5. The printing mechanism includes: a shaft rotatably provided at a front end of the printing paper drawer; a push-up bar mounted on the shaft and adapted to rotate with the shaft; and an operating handle attached to the shaft for driving the shaft to rotate; The paper lifting mechanism further includes a paper lifting mechanism having .... The printing mechanism of claim 1 , wherein the push-up rod is received in an opening in the base plate or is capable of rotating with the shaft and passing through the opening in the base plate.

6. 6. The printing mechanism of claim 5, wherein said paper push-up mechanism further comprises a return spring attached to said operating handle for returning said operating handle to an initial position.

7. 6. The printing mechanism of claim 5, wherein the push rod end is provided with a silicone sleeve.

8. The printing mechanism includes: Support plate, a support arm disposed on the support plate, the support arm having a print head thereon, the movable frame assembly further including a rubber platen attached to a front end of the frame adjacent an exterior of the medical monitoring device and in pressure contact with the print head; and A drive mechanism for driving the rubber platen to rotate.

2. The printing mechanism of claim 1, further comprising: said movable frame assembly on said support plate and movably disposed between said support plate and said support arm.

9. The printing mechanism includes: A pair of elastic clamp claws disposed opposite each other at a rear end of the frame; and A locking post disposed on the support plate corresponding to the elastic clamp claw and a locking mechanism having The elastic clamping claws are interlocked together, The elastic clamp claws open under an external pushing force to receive the locking post and securely fasten the locking post; and The resilient clamping claw disengages from the locking post under an external pulling force.

9. The printing mechanism of a medical monitoring device of claim 8.

10. The drive mechanism includes: a first pulley fixedly mounted to one end of the rubber platen; an electric motor mounted to the frame; a second pulley attached to a rotating shaft of the electric motor; and a timing belt connecting the first pulley and the second pulley so as to drive the rubber platen to rotate when the electric motor is actuated; 9. The printing mechanism of claim 8, wherein the electric motor is disposed at a rear end of the frame adjacent an interior side of the medical monitoring device.

11. the support arm is L-shaped; the support arm having one end rotatably attached to the support plate and another end including a print head mounting portion; The print head is attached to the print head attachment portion.

9. The printing mechanism of a medical monitoring device of claim 8.

12. The frame is a first mounting plate and a second mounting plate disposed opposite each other; and a first connecting plate and a second connecting plate that fixedly connect the first mounting plate and the second mounting plate to each other; having The first mounting plate has a first guide slot extending along a longitudinal direction thereof; The second mounting plate has a second guide slot formed therein and extending along a longitudinal direction thereof; Both ends of the print head mounting portion are movably supported in the first guide slot and the second guide slot.

12. The printing mechanism of a medical monitoring device of claim 11.

13. The printing mechanism for a medical monitoring device of claim 1 , wherein the medical monitoring device is a fetal monitor.

14. A medical monitoring device comprising a printing mechanism according to any one of claims 1 to 13.

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