A dual color pen

Abstract

This invention belongs to the field of drawing pen technology, specifically relating to a two-color pen. It includes a pen body, a rolling element, and a water supply assembly. The rolling element is rotatably mounted at the head of the pen body. There is at least one pair of water supply assemblies. The pen body has a reset device that pushes the water supply assemblies into contact with the rolling element. The rolling element has a transmission part that alternately pushes the two paired water supply assemblies away from the rolling element. The reset device in this two-color pen pushes the water supply assemblies that output different colors towards the rolling element. During the rolling process, the transmission part on the rolling element alternately pushes the two paired water supply assemblies away from the rolling element, allowing the water outlets of the two paired water supply assemblies to alternately contact the rolling element under the action of the reset device. This enables the pen to draw lines or patterns with two colors, thus better meeting the user's needs.

Description

Technical Field

[0001] This invention belongs to the field of drawing technology, specifically relating to a two-color pen. Background Technology

[0002] Currently, there is a type of paintbrush on the market that can directly draw patterns. This paintbrush includes a pen barrel and a pattern roller. The pattern roller is rotatably mounted at the front end of the pen barrel, and the axis of rotation of the pattern roller is perpendicular to the axis of the pen barrel. Inside the pen barrel, there is a core that provides ink and a fiber head. The tail end of the fiber head is inserted into the core to draw ink from the core, and the head end of the fiber head slides in contact with the pattern roller. When the pattern roller rolls on the paper, the fiber head can continuously rub ink onto the pattern roller, so that the pattern roller can continuously draw ink onto the paper in the form of a pattern to complete the drawing.

[0003] For example, the Chinese utility model patent with patent number 202222326757.2 and title "A non-stop drawing pen" has an ink-drawing device that is always pressed against the pattern roller during the drawing process, so that the pattern roller can draw lines or patterns on the paper.

[0004] However, the ink-drawing device in the aforementioned drawing pen can only supply one color of ink to the pattern roller, resulting in lines or patterns drawn with a relatively limited color, making it impossible to create beautiful lines or patterns and thus failing to meet the user's needs. Therefore, inventing a two-color pen capable of drawing lines or patterns with two colors is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the prior art, the present invention provides a two-color pen to solve the technical problem that the ink-drawing device in the prior art drawing pen can only output one color of pigment to the pattern roller, resulting in the pattern roller drawing lines or patterns with relatively simple colors, which cannot meet the user's needs.

[0006] This invention is specifically implemented through the following technical solutions:

[0007] A two-color pen, comprising a pen body, a scroll, and an ink supply assembly;

[0008] The rolling element is rotatably mounted at the head of the pen body;

[0009] The number of water supply components is at least one pair, and the pen body is provided with a reset device that pushes the water supply components to contact the rolling element; the rolling element is provided with a transmission part that pushes the two pairs of water supply components alternately away from the rolling element.

[0010] To better realize the present invention, the above structure is further optimized. The number of water supply components is two, and both water supply components are disposed in the pen body. The transmission part includes two transmission members A, which are respectively disposed at both ends of the rolling element, and the two transmission members A are respectively connected to the two water supply components.

[0011] To better realize the present invention, further optimizations are made to the above structure. The rolling body includes multiple marking wheels, the transmission part includes two transmission components A and multiple transmission components B, the multiple marking wheels are coaxially connected in sequence through the transmission components B to form the marking part, the number of marking wheels is equal to the logarithm of the water supply assembly, and the two transmission components A are respectively disposed at both ends of the marking part.

[0012] The positions of the multiple pairs of water supply components and the multiple drawing wheels correspond one-to-one. The transmission components B on both sides of the drawing wheels and the transmission components B or A are connected to the corresponding pairs of water supply components.

[0013] To better realize the present invention, further optimizations are made to the above structure. The water supply component includes a water storage device and a water guiding device. The water storage device is fixedly disposed inside the pen body, and the water guiding device is slidably disposed between the water storage device and the rolling element. The water guiding end of the water guiding device is always connected to the water outlet end of the water storage device.

[0014] To better realize the present invention, further optimizations are made to the above structure. The water-guiding device includes a water-guiding seat and a water-guiding core. The water-guiding seat is slidably disposed between the water storage device and the rolling body, and the water-guiding core is disposed on the water-guiding seat. The end of the water-guiding seat facing the rolling body is provided with a pressing protrusion that cooperates with the transmission part.

[0015] To better realize the present invention, the above structure is further optimized. The cross-sectional shape of the transmission part is fan-shaped, and the arc surface of the transmission part is the extrusion surface that abuts and cooperates with the extrusion protrusion.

[0016] To better realize the present invention, further optimizations are made to the above structure. The reset device is a helical spring, and a limiting protrusion is provided on the circumferential side wall of the water inlet seat. The limiting protrusion is located at one end of the water inlet seat near the rolling element. The reset device is sleeved on the water inlet seat. One end of the reset device abuts against the head of the pen body, and the other end of the reset device abuts against the limiting protrusion. The reset device is always in a compressed state.

[0017] To better realize the present invention, further optimizations are made to the above structure. The dual-color pen also includes a limiting base, which is inserted into the head of the pen body. The limiting base is provided with a through hole corresponding to the position of the water-guiding device. The water-guiding end of the water-guiding device passes through the through hole and is connected to the water storage device. The end of the reset device away from the rolling element abuts against the limiting base. The rolling element is located at the end of the limiting base away from the pen body.

[0018] To better realize the present invention, further optimizations are made to the above structure. The dual-color pen also includes a fixing base, which is inserted into the end of the limiting base away from the pen body. Two brackets are provided at the end of the fixing base away from the limiting base. The two ends of the rolling element are respectively rotatably mounted on the two brackets. The water guiding device is slidably mounted between the limiting base and the fixing base.

[0019] To better realize the present invention, further optimizations are made to the above structure. The inner sidewall of the fixed base is provided with a sliding groove, the length direction of the sliding groove is parallel to the length direction of the pen body, and the sidewall of the water guiding device is provided with a protrusion that matches the sliding groove. The water guiding device is slidably disposed in the fixed base through the cooperation of the protrusion and the sliding groove.

[0020] To better realize the present invention, the above structure is further optimized. The rolling element is a cylindrical structure, and a rotating shaft is provided at both ends of the rolling element. The rolling element is rotatably mounted on the head of the pen body through the rotating shaft, and the axis of the rotating shaft is perpendicular to the length direction of the pen body.

[0021] To better realize the present invention, further optimizations are made to the above structure. The two-color pen also includes a pen sleeve for protecting the rolling element, the pen sleeve being detachably fitted onto the head of the pen body.

[0022] To better realize the present invention, the above structure is further optimized. A pen tip is provided at the end of the pen body away from the rolling element, a water storage part is provided in the pen body, and the water inlet end of the pen tip is connected to the water storage part.

[0023] In summary, the dual-color pen provided by this invention has the following technical effects:

[0024] The reset device in this dual-color pen can push the water supply components that output different colors toward the rolling body. As the rolling body rolls, the transmission part on the rolling body can push the two pairs of water supply components alternately away from the rolling body, so that the water outlet ends of the two pairs of water supply components can alternately contact the rolling body under the action of the reset device, so that the rolling body can draw lines or patterns with two colors, thereby better meeting the user's needs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural schematic diagram of a two-color pen according to the present invention;

[0027] Figure 2 This is a cross-sectional view of a two-color pen according to the present invention;

[0028] Figure 3 This is a diagram showing the interaction between the rolling element of a two-color pen and the water-drawing device as described in Embodiment 1.

[0029] Figure 4 This is a schematic diagram of the water-drawing device in a two-color pen according to the present invention;

[0030] Figure 5 This is a cross-sectional view of a fixing component in a two-color pen according to the present invention;

[0031] Figure 6 This is a diagram illustrating the interaction between the rolling element of a two-color pen and the water-drawing device, as described in Embodiment 2.

[0032] Figure 7 This is a front view of the two-color pen's rolling element and the water-drawing device as described in Embodiment 2.

[0033] Figure label:

[0034] 1. Pen body; 11. Limiting base; 12. Fixing base; 121. Bracket; 122. Slide groove;

[0035] 2. Rolling element; 21. Marking wheel; 22. Shaft; 23. Transmission component A; 24. Transmission component B;

[0036] 3. Water storage device;

[0037] 4. Water intake device; 41. Water intake seat; 411. Compression protrusion; 412. Limiting protrusion; 42. Water intake core;

[0038] 5. Reset device;

[0039] 6. Pen cap;

[0040] 7. Pen nib;

[0041] 8. Water storage section. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0043] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] Example:

[0046] like Figures 1 to 5 As shown:

[0047] A two-color pen, specifically a single-line two-color pen, includes a pen body 1, a scroll body 2, and an ink supply assembly; wherein...

[0048] The pen body 1 has an internal cavity, and the head of the pen body 1 has an opening that communicates with the cavity; the rolling element 2 is rotatably disposed at the head of the pen body 1, that is, at the opening of the pen body 1.

[0049] The number of water supply components is at least one pair. The pen body 1 is provided with a reset device 5 that pushes the water supply components to contact the rolling element 2. The rolling element 2 is provided with a transmission part that pushes the two pairs of water supply components alternately away from the rolling element 2.

[0050] The two water supply components in the pair contain different colors of ink. The reset device 5 in the dual-color pen can push the water supply components that output different colors towards the rolling body 2. During the rolling process, the transmission part provided on the rolling body 2 can push the two water supply components in the pair alternately away from the rolling body 2, so that one of the water inlet devices 4 is pushed away from the rolling body 2 by the transmission part, so that the water outlet end of the two water supply components can alternately abut against the rolling body 2 under the action of the reset device 5, so that the rolling body 2 can draw lines or patterns with two colors (the two colors are intermittently distributed on the lines or patterns), thereby better meeting the user's needs.

[0051] Specifically, there are two water supply components, both of which are slidably disposed in the pen body 1, and the sliding direction of the water supply components is parallel to the length direction of the pen body 1.

[0052] The aforementioned transmission unit includes two transmission components A23, which are respectively disposed at both ends of the rolling body 2 and are respectively connected to two water supply components. This allows the two water supply components to be pushed away from the rolling body 2 in an alternating manner by the two transmission components A23, so that the rolling body 2 can draw lines or patterns with two colors.

[0053] The optimized water supply components include a water storage device 3 and a water intake device 4; wherein,

[0054] The water storage device 3 is fixedly installed inside the pen body 1, and the water guiding device 4 is slidably installed between the water storage device 3 and the rolling body 2. The water guiding end of the water guiding device 4 is always connected to the water outlet end of the water storage device 3, so that the pigment in the water storage device 3 can be transported to the surface of the rolling body 2 through the water guiding device 4 and drawn on the desired position by the rolling body 2.

[0055] The optimized water-drawing device 4 includes a water-drawing base 41 and a water-drawing core 42; wherein,

[0056] The water inlet seat 41 is slidably disposed between the water storage device 3 and the rolling body 2, and the water inlet core 42 is disposed on the water inlet seat 41; the end of the water inlet seat 41 facing the rolling body 2 is provided with a compression protrusion 411.

[0057] When the protruding surface of the transmission part abuts against the extrusion protrusion 411, the water-guiding seat 41 is pushed away from the rolling body 2 by the transmission part, causing the water-guiding seat 41 to move away from the rolling body 2, thereby separating the water outlet end of the water-guiding core 42 from the rolling body 2 and preventing the delivery of pigment to the surface of the rolling body 2.

[0058] In the optimized configuration, the cross-sectional shape of the aforementioned transmission part is fan-shaped, and the arc surface of the transmission part is an extrusion surface that abuts against the extrusion protrusion 411.

[0059] It should be noted that the number of transmission parts at both ends of the rolling body 2 can be set to multiple. Multiple transmission parts located at the same end are arranged at equal intervals around the rotation center of the rolling body 2 to change the contact frequency between the two water-guiding devices 4 and the rolling body 2, thereby changing the intermittent frequency of the two colors in the lines or patterns drawn by the two-color pen.

[0060] The combined shape of the projection surfaces of the multiple transmission parts at both ends of the aforementioned rolling element 2 is a complete circle.

[0061] Preferably, the reset device 5 is a helical spring. A limiting protrusion 412 is provided on the circumferential side wall of the water inlet seat 41. The limiting protrusion 412 is located at the end of the water inlet seat 41 near the rolling element 2. The reset device 5 is sleeved on the water inlet seat 41, so that the reset device 5 can be more stably installed on the water inlet seat 41. One end of the reset device 5 abuts against the opening, and the other end of the reset device 5 abuts against the limiting protrusion 412. The reset device 5 is always in a compressed state. The restoring force generated by the reset device 5 can push the water inlet seat 41 away from the cavity.

[0062] When the protruding surface of the transmission part does not abut against the pressing protrusion 411, the restoring force generated by the reset device 5 will push the water guiding device 4 toward the rolling body 2, and make the water outlet end of the water guiding core 42 abut against the circumferential side wall of the rolling body 2.

[0063] The optimized dual-color pen also includes a limiting base 11; wherein,

[0064] The limiting base 11 is inserted into the head of the pen body 1, and the limiting base 11 has a through hole corresponding to the position of the water guiding device 4. The water guiding end of the water guiding device 4 is a rod-shaped structure. The water guiding end of the water guiding device 4 passes through the through hole and is slidably disposed in the water storage device 3. During the sliding process of the water guiding device 4, the water guiding end of the water guiding device 4 is always connected to the water storage device 3, so that the pigment in the water storage device 3 can be guided to the rolling body 2 through the water guiding device 4.

[0065] The end of the aforementioned reset device 5 away from the rolling element 2 rests against the limiting base 11.

[0066] The optimized dual-color pen also includes a retainer 12; wherein,

[0067] The fixed base 12 is inserted at the end of the limiting base 11 away from the pen body 1. Two brackets 121 are provided at the end of the fixed base 12 away from the limiting base 11. The two ends of the rolling element 2 are respectively rotatably mounted on the two brackets 121 to make the installation of the rolling element 2 more convenient. The water guiding device 4 is slidably mounted between the limiting base 11 and the fixed base 12.

[0068] In an optimized configuration, the inner wall of the aforementioned fixed base 12 is provided with two sliding grooves 122. The length direction of the sliding grooves 122 is parallel to the length direction of the pen body 1. The side wall of the water-guiding device 4 is provided with protrusions that match the sliding grooves. Both water-guiding devices 4 are slidably disposed in the fixed base 12 through the cooperation of the protrusions and the sliding grooves, so as to limit the sliding direction of the water-guiding device 4 and prevent the reaction force generated by the rolling body 2 on the water-guiding core 42 when the water-guiding core 42 abuts against the rolling body 2 from squeezing the water-guiding core 42 towards the side of the water-guiding base 41, thus causing the water-guiding core 42 to shift. This makes the structure of the two-color pen more stable.

[0069] In an optimized configuration, the aforementioned rolling element 2 is a cylindrical structure, with a rotating shaft 22 at both ends. The rolling element 2 is rotatably mounted on the aforementioned bracket 121 via the rotating shaft 22, and the axis of the rotating shaft 22 is perpendicular to the length direction of the pen body 1.

[0070] Patterned raised strips are provided on the circumferential sidewall of the rolling body 2. The patterned raised strips are arranged around the circumference of the rolling body 2, and the water outlets of the two water inlet devices 4 alternately abut against the patterned raised strips.

[0071] It should be noted that the above-mentioned patterned raised stripes can be straight or wavy. When the patterned raised stripes are straight, the two-color pen can draw straight lines with alternating colors; when the patterned raised stripes are wavy, the two-color pen can draw wavy lines with alternating colors.

[0072] In addition, patterns or designs can be added to the raised strips, enabling the two-color pen to draw patterns with alternating colors.

[0073] In addition, the optimized two-color pen also includes a pen sleeve 6, which is detachably fitted onto the end of the pen body 1 where the rolling element 2 is located, so as to better protect the rolling element 2 and prevent the rolling element 2 from being damaged, resulting in incomplete lines or patterns.

[0074] In an optimized configuration, the pen body 1 is provided with a pen tip 7 at the end away from the rolling element 2, and a water storage part 8 is provided inside the pen body 1, with the water inlet of the pen tip 7 connected to the water storage part 8.

[0075] When the user needs to use a regular pen, the user only needs to flip the pen body 1 and use the pen tip 7 at the end of the pen body 1 away from the rolling body 2 to draw patterns or lines, thus making the use of the two-color pen more convenient.

[0076] Example 2:

[0077] like Figure 1 , Figure 2 as well as Figures 4 to 7 As shown:

[0078] A two-color pen, specifically a multi-line two-color pen, includes a pen body 1, a scroll body 2, and an ink supply assembly; wherein...

[0079] The pen body 1 has an internal cavity, and the head of the pen body 1 has an opening that communicates with the cavity; the rolling element 2 is rotatably mounted on the head of the pen body 1.

[0080] The number of water supply components is at least one pair. The pen body 1 is provided with a reset device 5 that pushes the water supply components to contact the rolling element 2. The rolling element 2 is provided with a transmission part that pushes the two pairs of water supply components alternately away from the rolling element 2.

[0081] The aforementioned rolling element 2 includes multiple marking wheels 21, and the transmission part includes two transmission components A23 and multiple transmission components B24. The multiple marking wheels 21 are coaxially connected through the transmission components B24 to form the marking part. The number of marking wheels 21 is equal to the logarithm of the water supply assembly. The two transmission components A23 are respectively disposed at both ends of the marking part.

[0082] Multiple pairs of water supply components are positioned one-to-one with multiple marking wheels 21. The transmission components B24 and A23 on both sides of the marking wheel 21 can push the two pairs of water supply components corresponding to the rolling body 2 in turn away from the rolling body 2, so that the water outlet end of the two pairs of water supply components corresponding to the marking wheel 21 can alternately abut against the marking wheel 21 in turn under the action of the reset device 5.

[0083] It should be noted that the logarithm mentioned above does not refer to the inverse operation of exponentiation in mathematics, but rather to the number of paired water supply components.

[0084] When the drawing part is rolling, the transmission components B24 and A23 on both sides of the drawing wheel 21 can alternately push the two water supply components corresponding to the drawing wheel 21 away from the drawing wheel 21, so that the water outlet of the two water supply components can alternately abut against the drawing wheel 21 under the action of the reset device 5, so as to deliver the pigment in the water supply components to the drawing wheel 21, and draw the required position through the drawing wheel 21 to complete the drawing of multiple lines.

[0085] It should be noted that the drawing wheel 21 described above can draw lines or patterns of two colors (the two colors are intermittently distributed on the lines or patterns), and the drawing part composed of multiple drawing wheels 21 can draw multiple lines, with the number of lines being equal to the number of drawing wheels 21.

[0086] Furthermore, the other structures of the two-color pen described in this embodiment are exactly the same as those of the two-color pen described in Embodiment 1. For details, please refer to the content in Embodiment 1. Detailed descriptions will not be provided here.

[0087] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A two-color pen, characterized in that: It includes the pen body (1), the rolling element (2), and the water supply assembly; The rolling element (2) is rotatably disposed at the head of the pen body (1); The number of water supply components is at least one pair, and the pen body (1) is provided with a reset device (5) that pushes the water supply components to contact the rolling body (2); the rolling body (2) is provided with a transmission part that pushes the two pairs of water supply components alternately in a direction away from the rolling body (2).

2. The two-color pen according to claim 1, characterized in that: The number of water supply components is two, and both water supply components are disposed in the pen body (1); the transmission part includes two transmission components A (23), which are respectively disposed at both ends of the rolling body (2), and the two transmission components A (23) are respectively connected to the two water supply components.

3. The two-color pen according to claim 1, characterized in that: The rolling element (2) includes multiple drawing wheels (21), and the transmission part includes two transmission components A (23) and multiple transmission components B (24). The multiple drawing wheels (21) are coaxially connected through the transmission components B (24) to form the drawing part. The number of drawing wheels (21) is equal to the logarithm of the water supply assembly. The two transmission components A (23) are respectively disposed at both ends of the drawing part. The positions of the multiple pairs of water supply components and the multiple drawing wheels (21) are one-to-one. The transmission components B (24) on both sides of the drawing wheel (21) and the transmission components B (24) or the transmission components A (23) are connected to the corresponding pairs of water supply components.

4. The two-color pen according to claim 2 or 3, characterized in that: The water supply assembly includes a water storage device (3) and a water intake device (4); the water storage device (3) is fixedly installed inside the pen body (1), and the water intake device (4) is slidably installed between the water storage device (3) and the rolling body (2), and the water intake end of the water intake device (4) is always connected to the water outlet end of the water storage device (3).

5. The two-color pen according to claim 4, characterized in that: The water-guiding device (4) includes a water-guiding seat (41) and a water-guiding core (42); the water-guiding seat (41) is slidably disposed between the water storage device (3) and the rolling body (2), and the water-guiding core (42) is disposed on the water-guiding seat (41); the end of the water-guiding seat (41) facing the rolling body (2) is provided with a pressing protrusion (411) that cooperates with the transmission part.

6. The two-color pen according to claim 5, characterized in that: The cross-sectional shape of the transmission part is fan-shaped, and the arc surface of the transmission part is the extrusion surface that abuts against the extrusion protrusion (411).

7. The two-color pen according to claim 6, characterized in that: The reset device (5) is a helical spring. A limiting protrusion (412) is provided on the circumferential side wall of the water inlet seat (41). The limiting protrusion (412) is located at one end of the water inlet seat (41) near the rolling body (2). The reset device (5) is sleeved on the water inlet seat (41). One end of the reset device (5) abuts against the head of the pen body (1), and the other end of the reset device (5) abuts against the limiting protrusion (412). The reset device (5) is always in a compressed state.

8. The two-color pen according to claim 7, characterized in that: It also includes a limiting base (11), which is inserted into the head of the pen body (1). The limiting base (11) has a perforation corresponding to the position of the water-guiding device (4). The water-guiding end of the water-guiding device (4) passes through the perforation and is connected to the water storage device (3). The end of the reset device (5) away from the rolling body (2) abuts against the limiting base (11). The rolling body (2) is located at the end of the limiting base (11) away from the pen body (1).

9. The two-color pen according to claim 8, characterized in that: It also includes a fixing seat (12), which is inserted into the end of the limiting base (11) away from the pen body (1). Two brackets (121) are provided at the end of the fixing seat (12) away from the limiting base (11). The two ends of the rolling body (2) are respectively rotatably mounted on the two brackets (121). The water guiding device (4) is slidably mounted between the limiting base (11) and the fixing seat (12).

10. The two-color pen according to claim 9, characterized in that: The inner sidewall of the fixed base (12) is provided with a sliding groove (122), the length direction of the sliding groove (122) is parallel to the length direction of the pen body (1), and the sidewall of the water guiding device (4) is provided with a protrusion that matches the sliding groove. The water guiding device (4) is slidably disposed in the fixed base (12) through the cooperation of the protrusion and the sliding groove.

11. The two-color pen according to claim 10, characterized in that: The rolling element (2) is a cylindrical structure. Both ends of the rolling element (2) are provided with a rotating shaft (22). The rolling element (2) is rotatably mounted on the head of the pen body (1) through the rotating shaft (22), and the axis of the rotating shaft (22) is perpendicular to the length direction of the pen body (1).

12. The two-color pen according to claim 11, characterized in that: It also includes a pen cap (6) for protecting the rolling element (2), the pen cap (6) being detachably fitted onto the head of the pen body (1).

13. The two-color pen according to claim 12, characterized in that: The pen body (1) is provided with a pen tip (7) at one end away from the rolling element (2), and a water storage part (8) is provided in the pen body (1). The water inlet of the pen tip (7) is connected to the water storage part (8).

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