A paper changing device for a body weight meter

Abstract

This invention belongs to the technical field of auxiliary devices for weighing instruments, specifically relating to a paper-changing device that allows paper to be used on both sides of a weighing scale. The device includes a base, a paper-feeding mechanism on one side of the base, and a swing arm and guide roller on the side of the base away from the paper-feeding mechanism. The guide roller is rotatably connected to the base. One end of the swing arm is hinged to the base, and a paper-receiving mechanism is mounted on the free end of the swing arm. The paper-receiving mechanism includes a paper-receiving roller and a drive mechanism that can drive the paper-receiving roller to rotate intermittently. The output end of the drive mechanism is connected to the paper-receiving roller. This invention solves the problem of current paper-changing devices only utilizing one side of the insulating material, resulting in low utilization and significant waste.

Description

Technical Field

[0001] This invention belongs to the technical field of auxiliary devices for weighing instruments, and specifically relates to a paper-changing device that allows paper to be used on both sides of a weighing scale. Background Technology

[0002] During physical examinations, it's common to measure the examinee's weight. To ensure an accurate weight, examinees are usually asked to remove their shoes before stepping onto the scale. If the examinee's feet harbor germs, there's a risk of cross-infection. One solution is to disinfect the scale's footplate with disinfectant after each examinee leaves. However, disinfectant makes the surface slippery, posing a risk of slipping, and it can also be corrosive. Another solution is to pad the footplate with tissue paper or non-woven fabric, replacing it after each measurement. This requires a paper-changing device, as disclosed in Chinese patents CN211602130U and CN213455809U. However, current paper-changing devices only utilize one side of the padding material, resulting in low utilization and significant waste. Summary of the Invention

[0003] The present invention aims to provide a paper changing device that allows the weighing scale to use paper on both sides, in order to solve the problem that current paper changing devices can only use one side of the insulating material, resulting in low utilization and significant waste.

[0004] To achieve the above objectives, the present invention provides a paper-changing device that allows a weighing scale to use paper on both sides, comprising a base, a paper-feeding mechanism on one side of the base, a swing arm and a guide roller on the side of the base away from the paper-feeding mechanism, the guide roller being rotatably connected to the base, one end of the swing arm being hinged to the base, and a paper-receiving mechanism being installed on the free end of the swing arm, the paper-receiving mechanism comprising a paper-receiving roller and a drive mechanism capable of driving the paper-receiving roller to rotate intermittently, the output end of the drive mechanism being connected to the paper-receiving roller.

[0005] The working principle and beneficial effects of this solution are as follows: the roll of paper is installed on the paper feeding mechanism, the weighing scale is placed between the paper feeding mechanism and the guide roller, the free end of the paper on the roll passes over the weighing scale and then around the guide roller, and is then fixed to the paper receiving roller of the paper receiving mechanism.

[0006] Before the pendulum swings towards the weighing scale, the previous person can stand on the paper on the scale to weigh themselves. After weighing, the pendulum swings towards the scale. During the swing, the drive mechanism does not drive the paper collection roller to rotate until the free end of the paper is stacked on the weighing scale. At this point, the unused side of the paper is facing up and the used side is facing down. When the next person stands on the paper, they will be in contact with the used side of the weighing scale. The pendulum then retracts in the opposite direction. During the retraction, the drive mechanism drives the paper collection roller to rotate, collecting the portion of the paper that has been stepped on from both sides. At this point, the paper on the weighing scale is again the unstepped portion. This process is repeated to alternately step on both sides of the isolation paper. Throughout the process, either the unstepped portion of the paper is stepped on, or the back of the portion stepped on by the previous person is stepped on. Even when the paper is stepped on, it is only stepped on by stepped on, completely avoiding contact between stepped and unstepped portions, thus completely preventing cross-infection. At the same time, it utilizes both sides of the isolation paper, greatly improving its utilization rate and reducing waste.

[0007] Optionally, the base is provided with C-shaped guide rails on both sides, and the two ends of the paper receiving mechanism are slidably connected to the guide rails.

[0008] Optionally, the drive mechanism includes a rack, a gear, and a slide. The rack is mounted on and parallel to the guide rail. The slide is slidably connected to the guide rail. The gear is rotatably connected to the slide and meshes with the rack. A drive shaft is coaxially mounted on the gear and rotatably connected to the slide. A one-way bearing is sleeved on the drive shaft, and the take-up roller is connected to the outer ring of the one-way bearing. When the swing arm swings, it drives the entire take-up mechanism to slide back and forth along the guide rail. Due to the one-way bearing, when the swing arm swings back and forth, the gear and rack drive the take-up roller to rotate unidirectionally in a certain swing direction of the swing arm, thereby achieving intermittent rotation of the take-up roller. This enables the swing arm to flip the paper and release it on the outward trip, and to roll up the stepped portion onto the take-up roller on the return trip. The entire process only requires the swing force of the swing arm and does not require additional power.

[0009] Optionally, the rocker arm can be a telescopic rod. This allows for more flexible placement of the hinge end of the rocker arm, and the C-shaped guide rail can also be elliptical, making the entire guide rail "flatter" and saving more space.

[0010] Optionally, a support frame is installed on the slide, and a pressure plate is installed on the support frame, the pressure plate being bent toward the take-up roller.

[0011] Optionally, the paper feeding mechanism includes a paper feeding roller and an L-shaped paper feeding roller frame, one end of which is detachably connected to the base, and the paper feeding roller is rotatably connected to the end of the paper feeding roller frame away from the base.

[0012] Optionally, a tension spring is provided on the side of the base away from the paper feeding mechanism, the tension spring is connected to the swing arm, a lock is provided on the support frame, and a locking hook that cooperates with the lock is provided on the side of the base near the paper feeding mechanism.

[0013] Optionally, the base is an L-shaped flat plate. This allows the base to be placed under the weighing scale, using the weight of the scale to hold down the entire paper-changing device and effectively prevent it from tipping over. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a paper-changing device that allows paper to be used on both sides of a weighing scale in conjunction with a weighing scale according to Embodiment 1 of the present invention.

[0015] Figure 2 This is a schematic diagram of a paper-changing device that allows paper to be used on both sides of a weighing scale, according to Embodiment 1 of the present invention. Detailed Implementation

[0016] The following detailed description illustrates the specific implementation method:

[0017] The markings in the accompanying drawings of the instruction manual include: weighing scale 1, base 2, vertical plate 21, bottom plate 22, paper feeding mechanism 3, paper feeding roller 31, paper feeding roller frame 32, paper receiving mechanism 4, gear 41, rack 42, slide 43, paper receiving roller 44, swing arm 5, tension spring 6, guide roller 7, guide rail 8, support frame 9, paper pressing plate 10, handle 11, locking hook 12, and locking buckle 13.

[0018] Example

[0019] This embodiment is basically as follows: Figure 1 , Figure 2 As shown: A paper-changing device for a weighing scale that allows paper to be used on both sides includes a base 2, which includes a vertical plate 21 and a bottom plate 22. The bottom plate 22 of the base 2 is a 2mm thick iron plate and is rectangular. A paper-feeding mechanism 3 is provided on one side of the base 2. The paper-feeding mechanism 3 includes a paper-feeding roller 31 and an L-shaped paper-feeding roller frame 32. The paper-feeding roller frame 32 is located near one wide side of the bottom plate 22. One end of the paper-feeding roller frame 32 is vertically inserted into the bottom plate 22 through a square pin, and the other end is parallel to the wide side of the bottom plate 22. A C-shaped guide rail 8 is welded to each side of the base parallel to the long side of the bottom plate 22. The two ends of the guide rail 8 are upside down on the bottom plate 22. The span of the guide rail 8 is greater than the length of the weighing scale 1, and the pedal of the weighing scale 1 can be inserted under the guide rail 8. The guide rail 8 has an arc-shaped through groove in the middle, which is parallel to the guide rail 8. A rack 42 is fixed on one side of the through groove, and the rack 42 is parallel to the through groove.

[0020] The base 2 is provided with a guide roller 7 and two swing rods 5 on the side away from the paper feeding mechanism 3. In this embodiment, the swing rods 5 are three-section telescopic rods. The two ends of the guide roller 7 are rotatably connected to the guide rail 8. The guide roller 7 is set horizontally and is parallel to the wide side of the base plate 22. Two swing arms 5 are respectively set on both sides of the guide roller 7. One end of the swing arm 5 is hinged to the base 2, and the other end of the swing arm 5 is a free end. A paper take-up mechanism 4 is installed on the free end of the swing arm 5. The paper take-up mechanism 4 includes a paper take-up roller 44 and a drive mechanism that can drive the paper take-up roller 44 to rotate intermittently. The drive mechanism can be a motor controlled by a PLC. In this embodiment, the drive mechanism includes a gear 41, a slide 43 and a rack 42 installed on the guide rail 8. The slide 43 is slidably connected to the guide rail 8. The gear 41 is rotatably connected to the slide 43. The gear 41 meshes with the rack 42. A drive shaft is coaxially installed on the gear 41. The drive shaft is rotatably connected to the slide 43. A one-way bearing is sleeved on the drive shaft. The one-way bearing self-locks counterclockwise and rotates freely clockwise. The drive shaft and the one-way bearing on the drive shaft constitute the output end of the drive mechanism. The paper take-up roller 44 is cylindrical and is fixedly connected to the outer ring of the one-way bearing. A support frame 9 is installed on the slide block 43, and a paper pressing plate 10 is installed on the support frame 9. The paper pressing plate 10 is bent toward the take-up roller 44.

[0021] The vertical plate 21 of the base 2 is located on the side away from the paper feeding mechanism 3, and a tension spring 6 is provided on the vertical plate 21. A hook is fixed on each swing rod 5, and the tension spring 6 is connected to the hook. The support frame 9 is provided with a handle 11 and a latch 13. The base is provided with a latch hook 12 that cooperates with the latch 13 on the side near the paper feeding mechanism 3. In this embodiment, the latch 13 and the latch hook 12 form a latch. When pressed once, the latch hook 12 locks the latch 13, and when pressed a second time, the latch hook 12 releases the latch 13.

[0022] The specific implementation process is as follows:

[0023] In this embodiment, the isolation paper used is roll paper. The pedal part of the weighing scale 1 passes through the space between the two guide rails 8. The roll paper is inserted into the paper feeding roller frame 32, and the roll paper can rotate freely relative to the paper feeding roller frame 32. Then, the free end of the paper on the roll paper passes over the weighing scale 1, goes around the guide roller 7, and is then fixed to the paper receiving roller 44 of the paper receiving mechanism 4.

[0024] Under the elastic force of the tension spring 6, the swing arm 5 is pulled to the far left. Then, the person being examined can stand on the paper (the front side of the paper) on the weighing scale 1 to weigh themselves. After weighing, the person holding the handle 11 pushes the swing arm 5 to swing towards the paper feeding mechanism 3. During the swing, the swing arm 5 automatically extends, the slider slides relative to the guide rail 8, and the gear 41 meshes with the rack 42 to drive the drive shaft to rotate clockwise. Since the one-way bearing is self-locking counterclockwise and free-rotating clockwise, the paper roller will not rotate but will pull the free end of the roll paper, allowing a section of paper to be released from the roll. Moreover, since the pressure plate 10 presses down on the side of the take-up roller 44, the friction of the take-up roller 44 is greater than the friction of the paper feeding roller 31, preventing the take-up roller 44 from being pulled to rotate clockwise until the swing arm 5 swings counterclockwise to its limit position, the locking hook 12 is inserted into the locking buckle 13, and the swing of the swing arm 5 is locked. At this point, the back of the paper is facing up, so when the next person stands on the paper, they will step on the back side. Then, the latch is pressed again, the latch 12 releases the latch 13, and the swing arm 5 rebounds and swings clockwise under the action of the tension spring 6. During the return stroke of the swing arm 5, the gear 41 meshes with the rack 42, driving the drive shaft to rotate counterclockwise, and the take-up roller 44 also rotates synchronously, thus collecting the stepped portion of the paper onto the take-up roller 44. The length of the collected paper is related to the diameter of the take-up roller 44 and the number of rotations of the gear 41. Repeating the above operation allows for alternating steps on both sides of the isolation paper. Throughout the process, the person undergoing the medical examination either steps on the untouched part of the paper or on the back of the part that was stepped on by the previous examinee. Even when the part has been stepped on, it is only stepped on by stepped on, completely avoiding contact between stepped and untouched parts. The monitoring personnel only need to touch the handle 11, without touching the paper itself, thus completely preventing cross-infection between the testing personnel and the examinee, and between examinees. At the same time, it achieves the utilization of both sides of the isolation paper, greatly improving the utilization rate of the isolation paper and reducing waste. The entire device does not require external energy such as electricity, is completely manual, energy-saving and environmentally friendly, and has a simple structure, is easy to operate, and is easy to maintain.

[0025] The above are merely embodiments of the present invention. The invention is not limited to the fields covered by these embodiments. Commonly known structures and characteristics in the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are able to access all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A paper-changing device that allows paper to be used on both sides of a weighing scale, characterized in that: The base is provided with a paper placing mechanism on one side, a swing lever and a guide roller on the side away from the paper placing mechanism, the guide roller is rotatably connected to the base, the swing lever is hingedly connected to the base at one end, a paper collecting mechanism is installed on the free end of the swing lever, C-shaped guide rails are provided on both sides of the base, the paper collecting mechanism is slidably connected to the guide rails at both ends, the paper collecting mechanism comprises a paper collecting roller and a driving mechanism capable of driving the paper collecting roller to rotate intermittently, the output end of the driving mechanism is connected to the paper collecting roller, the driving mechanism comprises a rack, a gear and a sliding seat, the rack is installed on the guide rail and parallel to the guide rail, the sliding seat is slidably connected to the guide rail, the gear is rotatably connected to the sliding seat, the gear is engaged with the rack, a driving shaft is coaxially installed on the gear, the driving shaft is rotatably connected to the sliding seat, a one-way bearing is sleeved on the driving shaft, the paper collecting roller is connected to the outer ring of the one-way bearing, a supporting frame is installed on the sliding seat, a paper pressing piece is installed on the supporting frame, and the paper pressing piece is bent towards the paper collecting roller; a tension spring is provided on the side of the base away from the paper placing mechanism, the tension spring is connected to the swing lever, a lock catch is provided on the supporting frame, and a lock hook matched with the lock catch is provided on the side of the base close to the paper placing mechanism.

2. The paper replacing device for a two-side paper of a body weight meter according to claim 1, wherein: The swing lever is a telescopic lever.

3. The paper replacing device for a two-side paper of a body weight meter according to claim 1, wherein: The paper placing mechanism comprises a paper placing roller and an L-shaped paper placing roller frame, one end of the paper placing roller frame is detachably connected to the base, and the paper placing roller is rotatably connected to the end of the paper placing roller frame away from the base.

4. The paper replacing device for a two-side paper of a body weight meter according to claim 1, wherein: The base is in the shape of an L-shaped flat plate.

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