Electronic pen with detachable refill

Abstract

An embodiment of the present invention discloses an electronic pen with a detachable refill, which includes a pen barrel, a refill, a nib cap, a main bracket and a pressure sensor disposed in the pen barrel. A friction sleeve for sleeving on the refill is installed in the pen barrel, and convex points are provided on the inner wall of the friction sleeve. A lever that rotates around a rotating shaft and uses the lever principle to transmit the pressure received by the refill is provided on the main bracket. The pressure sensor is disposed on the main bracket corresponding to one end of the lever. The other end of the lever contacts the friction sleeve during writing. A pressure module for transmitting the lever pressure to the pressure sensor is installed in the pen barrel. The present invention uses a friction sleeve to transmit the pressure during the writing of the refill, can adapt to refills of different lengths, is convenient for users to replace, has a simple structure, is convenient to assemble, and has a low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of office electronics, and particularly relates to an electronic pen with a detachable refill. Background Art

[0002] Existing electronic styluses are becoming more and more intelligent. Existing electronic styluses can not only be used to write normally on coded paper with a regular ballpoint pen, but also can use a camera inside the pen to capture the trajectory of the pen tip, synchronously process it into an electronic document, and at the same time transmit the magnitude of the pressure when the pen tip contacts to a pressure element inside the electronic stylus. However, there are generally the following two ways to collect the pressure when the pen tip contacts in existing electronic styluses:

[0003] 1. The pressure element is correspondingly arranged at the tail of the refill to detect the writing pressure transmitted from the tail of the refill. However, this method has requirements for the length of the refill. If the user replaces refills of different lengths, the detection cannot be performed.

[0004] 2. The pressure element is correspondingly arranged at the front end of the refill to detect the writing pressure transmitted from the convex ring at the front end of the refill. However, this method will increase the number of front-end devices of the electronic stylus, making the structure complex, and further making the electronic stylus appear very bulky, not beautiful and affecting the user's writing. Summary of the Invention

[0005] The technical problem to be solved by the embodiments of the present invention is to provide an electronic pen with a detachable refill to simplify the structure and facilitate the replacement of refills of different lengths.

[0006] To solve the above technical problem, the embodiments of the present invention propose an electronic pen with a detachable refill, which includes a pen barrel, a refill, a pen tip cap, and a main bracket and a pressure sensor arranged inside the pen barrel. A friction sleeve for sleeving on the refill is installed inside the pen barrel. The inner wall of the friction sleeve is provided with bumps. A lever that uses the lever principle to transmit the pressure received by the refill and rotates around a rotating shaft is arranged on the main bracket. The pressure sensor is arranged on the main bracket corresponding to one end of the lever. The other end of the lever contacts the friction sleeve during writing. A pressure module for transmitting the lever pressure to the pressure sensor is installed inside the pen barrel.

[0007] Further, the pressure module includes a pressure bearing seat. During writing, the pressure bearing seat contacts one side of one end of the lever; a telescopic rod that can move telescopically is arranged on the pressure bearing seat. The front end of the telescopic rod contacts the pressure sensor correspondingly. A pressure bearing spring for preventing the telescopic rod from being over-pressed is sleeved on the telescopic rod; a limit block protrudes on the telescopic rod, and a limit groove corresponding to the limit block is arranged on the pressure bearing seat; one end of the pressure bearing spring acts on the pressure bearing seat, and the other end acts on the telescopic rod.

[0008] Further, the pre-pressure F2 of the pressure bearing spring satisfies the following formula:

[0009] F1 > F2*(L2 / L1);

[0010] F1 is the maximum static friction between the refill and the friction sleeve, L1 is the force arm of the friction sleeve acting on the lever, and L2 is the force arm of the pressure bearing seat acting on the lever.

[0011] Furthermore, front and rear limit parts are respectively arranged at the front and rear ends of the friction sleeve on the main bracket.

[0012] Furthermore, contact points are convexly provided at the contact positions between the lever and the pressure bearing seat and between the lever and the friction sleeve.

[0013] Furthermore, a gap is left between the pen tip cap and the refill.

[0014] The beneficial effects of the present invention are as follows: The present invention uses a friction sleeve to transmit the pressure during the writing of the refill, can adapt to refills of different lengths, is convenient for users to replace, has a simple structure, is convenient for assembly, and has a low cost. Description of the Drawings

[0015] Figure 1 is the front view of the electronic pen with a detachable refill according to the embodiment of the present invention.

[0016] Figure 2 is Figure 1 the sectional view taken along line B-B in

[0017] Figure 3 is the internal structure diagram of the electronic pen with a detachable refill according to the embodiment of the present invention.

[0018] Figure 4 is Figure 3 the sectional view taken along line A-A in

[0019] Figure 5 is Figure 4 the sectional view taken along line C-C in

[0020] Figure 6 is the three-dimensional structure diagram of the pressure module according to the embodiment of the present invention.

[0021] Figure 7 is the sectional view of the pressure module according to the embodiment of the present invention.

[0022] Figure 8 is the exploded view of the main bracket according to the embodiment of the present invention.

[0023] Figure 9 is the three-dimensional structure diagram of the friction sleeve according to the embodiment of the present invention.

[0024] Figure 10 is the bottom view of the friction sleeve according to the embodiment of the present invention.

[0025] Description of the Reference Numerals in the Drawings

[0026] Convex point 1, pen barrel 10, friction sleeve 11, lever 12, rotating shaft 13, pressure-bearing seat 14, telescopic rod 15, pressure-bearing spring 16, limit block 17, limit groove 18, counterbore 19, refill 20, convex ring 21, pen tip cap 30, main bracket 40, front limit portion 41, rear limit portion 42, pressure sensor 50. Detailed implementation

[0027] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0028] In the embodiments of the present invention, if there are directional indications (such as up, down, left, right, front, rear...), they are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, in the present invention, the descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0030] Please refer to Figures 1 to 10 , the refill-removable electronic pen in the embodiments of the present invention includes a pen barrel, a refill, a pen tip cap, and a main bracket and a pressure sensor provided in the pen barrel.

[0031] A friction sleeve for sleeving on the refill is installed in the pen barrel, and convex points are provided on the inner wall of the friction sleeve. The inner diameter of the friction sleeve is larger than the outer diameter of the refill, and the inner diameter at the convex points is smaller than the outer diameter of the refill. The present invention can be compatible with refills of various lengths.

[0032] A lever is provided on the main bracket, and the lever rotates around a rotating shaft to transmit the pressure received by the refill using the lever principle. The pressure sensor is provided on the main bracket at a position corresponding to one end of the lever. The other end of the lever contacts the friction sleeve during writing, and a pressure module for transmitting the pressure of the lever to the pressure sensor is installed in the pen barrel. The present invention can amplify the writing pressure using the lever.

[0033] After the friction sleeve is assembled, the lever and the pressure module are close to each other but have no interaction force, the lever and the friction sleeve are close to each other but have no interaction force, and there is a gap between the friction sleeve and the main bracket.

[0034] As an implementation manner, the pressure module includes a pressure-bearing seat. When the electronic pen with a detachable refill is writing, the pressure-bearing seat contacts with one side of one end of the lever; a telescopic rod capable of moving back and forth is arranged on the pressure-bearing seat, the front end of the telescopic rod correspondingly contacts with the pressure sensor, a pressure-bearing spring for preventing the telescopic rod from being over-pressed is sleeved on the telescopic rod; a limiting block protrudes on the telescopic rod, and a limiting groove corresponding to the limiting block is arranged on the pressure-bearing seat; one end of the pressure-bearing spring acts on the pressure-bearing seat, and the other end acts on the telescopic rod. The pressure module prevents overpressure and protects the pressure sensor.

[0035] As an implementation manner, the pre-pressure of the pressure-bearing spring is F2 and satisfies the following formula:

[0036] F1 > F2*(L2 / L1);

[0037] F1 is the maximum static friction force between the refill and the friction sleeve, L1 is the force arm of the friction sleeve acting on the lever, and L2 is the force arm of the pressure-bearing seat acting on the lever.

[0038] As an implementation manner, front limiting parts and rear limiting parts are respectively arranged on the main bracket corresponding to the front and rear ends of the friction sleeve.

[0039] As an implementation manner, contact points protrude at the contact positions between the lever and the pressure-bearing seat and between the lever and the friction sleeve. The contact points make L1 and L2 more accurate.

[0040] As an implementation manner, a gap is left between the nib cap and the refill.

[0041] The working principle of the present invention is as follows:

[0042] When the ballpoint pen refill is pressed in, the friction sleeve is provided with bumps that are interference-fitted with the outer periphery of the refill. When the refill is inserted into the friction sleeve, the maximum static friction force between the refill and the friction sleeve is set as F1, the pre-pressure of the pressure-bearing spring is F2, the insertion force of the refill is F, and the supporting force of the pressure module on the lever is N. It is set that F1 > F2*(L2 / L1). When the insertion force F of the refill is large enough, that is, F > F2*(L2 / L1), the pressure module is compressed, the lever is deflected, the pressure module is partially compressed, and there are gaps between the friction sleeve and both ends of the main bracket. During this process, the refill has not been inserted and passed through the friction sleeve;

[0043] Continue to apply force to press in the refill so that F (the insertion force of the refill) > F2 (the maximum static friction force of the friction sleeve) until the friction sleeve is blocked by the main bracket, the refill is pressed into the friction sleeve, and the convex ring at the front end of the refill is blocked by the sunk table at the front end of the pen barrel;

[0044] Release the refill, and the pressure module bounces up the friction sleeve; at this time, there is no relative movement between the refill and the friction sleeve; there are gaps between both ends of the friction sleeve and the main bracket, and there is a gap between the convex ring at the front end of the refill and the sunk table at the front end of the pen barrel;

[0045] Screw on the nib cap, leaving a gap between the nib cap and the refill to avoid jamming due to errors.

[0046] When the pen is writing on paper, when the force on the refill is small F2 (pre-pressure of the pressure module), normal writing can be carried out and the refill does not retract. Increase the writing pressure until the step of the refill abuts against the counterbore of the nib. At this time, the friction sleeve also abuts against the main bracket. During this process, there is no relative position change between the friction sleeve and the refill. After lifting the pen, no pressure is applied to the nib, and the pressure module resets the refill. The present invention uses a pressure module to achieve the reset of the refill stroke.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electronic pen with a detachable refill, comprising a pen barrel, a refill, a nib cap, and a main bracket and a pressure sensor disposed within the pen barrel, characterized in that, A friction sleeve for sleeving on a pen refill is installed inside the pen barrel. Convex points are provided on the inner wall of the friction sleeve. A lever that rotates around a rotating shaft and uses the lever principle to transmit the pressure received by the pen refill is provided on the main bracket. A pressure sensor is arranged on the main bracket at a position corresponding to one end of the lever. The other end of the lever contacts the friction sleeve during writing. A pressure module for transmitting the lever pressure to the pressure sensor is installed inside the pen barrel; The pressure module includes a pressure-bearing seat. During writing, the pressure-bearing seat contacts one side of one end of the lever; a telescopic rod is provided on the pressure-bearing seat, and the front end of the telescopic rod contacts the pressure sensor correspondingly. A pressure-bearing spring for preventing the telescopic rod from being over-pressed is sleeved on the telescopic rod; a limiting block protrudes on the telescopic rod, and a limiting groove corresponding to the limiting block is provided on the pressure-bearing seat; one end of the pressure-bearing spring acts on the pressure-bearing seat, and the other end acts on the telescopic rod; The pre-pressure of the pressure-bearing spring is F2 and satisfies the following formula: F1 > F2*(L2 / L1); F1 is the maximum static friction force between the pen refill and the friction sleeve, L1 is the length of the force arm of the friction sleeve acting on the lever, and L2 is the length of the force arm of the pressure-bearing seat acting on the lever; Front limiting parts and rear limiting parts are respectively provided on the main bracket corresponding to the front and rear ends of the friction sleeve.

2. The refill-removable electronic pen according to claim 1, wherein Contact points protrude at the contact positions between the lever and the pressure-bearing seat and between the lever and the friction sleeve.

3. The refill-removable electronic pen according to claim 1, wherein A gap is left between the pen tip cap and the pen refill.

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