Motion conversion mechanism for tattooing device and tattooing device

Abstract

The present invention relates to a motion conversion mechanism for a tattooing device and a tattooing device. The motion conversion mechanism comprises: a first conversion mechanism for converting a rotation motion of a motor into a reciprocating swing of a swing member, and a second conversion mechanism for converting the reciprocating swing of the swing member into a reciprocating linear motion of a driving member. The second conversion mechanism is configured to make, in the advance stroke of the driving member driving a tattooing needle, the average speed of the driving member in the second half stroke greater than the average speed in the first half stroke. The second conversion mechanism is further configured to make, in the retraction stroke of the driving member driving the tattooing needle, the average speed of the driving member in the first half stroke greater than the average speed in the second half stroke. The motion conversion mechanism for the tattooing device and the tattooing device of the present invention make the motion of the motion conversion mechanism more regular and beneficial to the operation by a tattooist.

Description

Motion conversion mechanism for tattoo device and tattoo device Technical Field

[0001] The present invention relates to the field of devices for applying liquid to skin, such as tattoo devices or devices for permanent makeup, and in particular to a motion conversion mechanism for a tattoo device and the tattoo device. Background Art

[0002] A tattoo device typically includes a needle for applying ink to the skin and a tattoo machine that drives the needle back and forth. During operation, the tattoo machine drives the ink-moistened needle forward and back, repeatedly piercing the skin of the tattooed individual and driving insoluble ink particles into the dermis.

[0003] The tattoo process involves the artist moving a handheld tattoo machine across the skin, with the needle penetrating the skin in a reciprocating motion at high frequency. In many cases, when setting the machine, the artist aims for the needle to be approximately halfway inside the skin and halfway outside. For example, if the machine has a stroke of 3.5 mm, the needle's forward and retract strokes are the same 3.5 mm, resulting in a penetration depth of 1.75 mm. The needle penetrates and exits the skin roughly midway between the forward and retract strokes. The machine can drive the needle in a linear forward and retract motion, or it can simply drive the needle forward, while during retraction, the needle is forced to follow the machine's retraction motion by an elastic member within the needle assembly. This creates a reciprocating motion.

[0004] Based on the mechanical principle and structure, tattoo machines include electromagnetic coil tattoo machines and rotary motor tattoo machines. Rotary motor tattoo machines are currently the mainstream.

[0005] A solenoid tattoo machine relies on the high-frequency switching of a solenoid coil to generate electromagnetic attraction, which interacts with the mechanical elastic force of a spring to drive an armature to oscillate at a high frequency. One end of the armature drives the tattoo needle or a push rod, which in turn propels the needle back and forth in a linear motion. The electromagnetic attraction between the solenoid coil and the armature is proportional to the cube of the distance between the coil and the armature. The process of the tattoo needle penetrating the skin is a process in which this distance decreases, during which the electromagnetic attraction increases dramatically, resulting in an accelerated impact. The needle retracts by the bent spring, driving the armature's oscillation. The retraction speed is typically slower than the insertion speed.

[0006] The mechanical structure principle of the electromagnetic coil tattoo machine can be referred to, for example, U.S. patent application publication number US2009 / 0183602A1 (inventor Derek S. Crockett), U.S. patent number US8393249B2 (inventors Arthur Alexander Godoy, Stephen Andrew Godoy), and U.S. patent number US6950004B2 (inventors Arthur Alexander Godoy, Stephen Andrew Godoy).

[0007] Rotary motor tattoo machines contain a mechanism that converts the motor's rotational motion into linear reciprocating motion. This motion conversion mechanism is typically a sine mechanism or an in-line slider-crank mechanism. The relationship between the tattoo needle's travel displacement and the motor's rotational position angle is roughly a sine curve.

[0008] The mechanical structure principle of the rotary motor tattoo machine can be referenced, for example, in U.S. Patent No. US9393395B2 (inventors Adam Carl Miller, Igor Evguenievich Chak), U.S. Patent No. US5741290 (inventor Ta-Ching Hsieh), PCT patent application publication No. WO2013 / 157029A1 (inventor Alessandro VENTURATO), and U.S. patent application publication No. US2021 / 0283389A1 (inventor Long Xiao).

[0009] During the tattooing process, the artist holds a tattoo machine and moves the needle along the skin's surface. The needle reciprocates at a frequency of 60 to 150 Hz, with a stroke of 2.5 to 5 mm. The needle typically penetrates the skin to a depth of 1.5 to 2 mm. Tattoo artists typically choose a machine with a specific stroke, such as 3.5 mm or 4.0 mm, based on their tattooing technique and habits.

[0010] The tattoo needle moves in a reciprocating linear motion consisting of a forward stroke and a retracted stroke. Generally, during the forward stroke, the first half of the stroke involves an acceleration phase, as the needle emerges from the nozzle and advances. Approximately midway through the forward stroke, the needle penetrates the skin. During the second half of the stroke, the needle penetrates the skin and continues to advance until it reaches the desired depth. During the retracted stroke, the needle, having penetrated the desired depth, retracts until the needle tip is completely out of the skin. At this point, the needle retracts approximately halfway through its stroke, then continues its retraction, entering the nozzle opening until it reaches the end of its stroke (also the starting point of the forward stroke). After the needle tip is wetted with ink within the nozzle, it begins the next forward stroke, repeating this cycle. During the tattooing process, while the needle remains in the skin, the artist's lateral movement along the skin surface can cause the needle tip to scrape (or scrape) the skin tissue. This scraping can further damage the skin wound, hindering rapid healing and quality tattoo results, and potentially increasing pain for the recipient. In order to avoid or reduce needle tip scratches, during the same reciprocating motion period of the tattoo needle, the time period for the tattoo needle to penetrate the skin, advance to a predetermined depth in the skin, and retract to exit the skin should be as short as possible, and the greater the proportion of time the tattoo needle spends running outside the skin, the better.

[0011] Skin has varying elasticity and laxity across individuals and areas. Highly lax skin can be locally deformed (indented) by the pressure of the tattoo needle tip during penetration, leading to incomplete or inconsistent tattoo depth. Large-sized tattoo needle bundles, such as those consisting of a 27-needle array, create significant resistance to penetration, causing even more severe deformation and indentation. This can lead to improper penetration or uneven penetration depth. In this case, the needle must possess a relatively high impact velocity. For needles with high penetration resistance, a higher impact velocity at the moment of penetration facilitates penetration. Some tattoo artists use electromagnetic coil tattoo machines, which are noisy and heavy, due to their pronounced acceleration and impact motion.

[0012] Tattoo artists choose different tattoo techniques based on factors such as the tattoo design and skin location. As the artist moves the needle along the skin's surface, the needle simultaneously penetrates the skin. When the tattoo machine's frequency is high, the artist must move the machine quickly. Otherwise, the needle will remain in the same spot, causing severe damage and resulting in poor or even unsuccessful tattoos. The tattoo process is similar to painting; faster is not always better. If the tattoo machine's speed is too high, beyond the artist's control (experience), the artist will be forced to work at a high speed, resulting in subpar results. Therefore, the tattoo machine's frequency should be adjusted to the artist's skill level and should not be set too high.

[0013] The motor speed of a rotary motor tattoo machine can be adjusted over a wide range. For fixed-stroke rotary motor tattoo machines, higher speeds increase the needle's instantaneous penetration speed. However, these high speeds also result in higher penetration frequencies. Each revolution of the tattoo machine's motor causes the needle to reciprocate and penetrate the skin once. Therefore, higher motor speeds correspond to higher penetration frequencies. To avoid repeated punctures in the same area, tattoo artists must move the machine quickly to match these high speeds and frequencies. This requires skilled technique to handle high-speed settings.

[0014] Rotary motor tattoo machines are becoming increasingly popular due to their quietness, light weight, and durable, flexible operation. However, some tattoo artists still prefer electromagnetic coil tattoo machines, which are noisy and heavy due to their significant acceleration and impact motion. If rotary motor tattoo machines could achieve similar speed characteristics to electromagnetic coil tattoo machines, it would be more user-friendly.

[0015] Therefore, for rotary motor tattoo machines, how to increase the instantaneous speed of tattoo needle penetration while keeping the tattoo frequency unchanged, so that the tattoo needle can impact the skin at high speed similar to an electromagnetic coil tattoo machine, is a technical problem that needs to be solved urgently. Summary of the Invention

[0016] Therefore, an object of the present invention is to provide a motion conversion mechanism for a tattoo device and a tattoo device, so that the motion conversion mechanism of a rotary motor tattoo machine has a motion law that is more conducive to the operation of the tattoo artist.

[0017] To achieve the above-mentioned object, the present invention provides a motion conversion mechanism for a tattoo device, comprising: a first conversion mechanism for converting the rotational motion of a motor into reciprocating oscillation of an oscillating member, and a second conversion mechanism for converting the reciprocating oscillation of the oscillating member into reciprocating linear motion of a driving member;

[0018] The second conversion mechanism includes a connecting rod, a driving member that directly or indirectly drives the tattoo needle, and a driving guide rail that limits the driving member to perform linear motion; the connecting rod is connected to the swinging member of the first conversion mechanism in an articulated manner at a first hinge point, and the connecting rod is connected to the driving member in an articulated manner at a second hinge point. When the swinging member swings back and forth, the first hinge point swings back and forth between the two end points with a circular arc as the motion trajectory, and the second hinge point is restricted by the driving guide rail and performs reciprocating linear motion between the two end points with a straight line segment as the trajectory. The connecting rod drives the driving member to perform linear reciprocating motion along the driving guide rail.

[0019] The mechanism of the present invention converts the motor's rotary motion into linear reciprocating motion with a forward stroke and a reverse stroke. The motion conversion mechanism is configured such that, within a reciprocating stroke cycle, the average speed in the second half of the forward stroke is greater than the average speed in the first half; and the average speed in the first half of the reverse stroke is greater than the average speed in the second half. This enables the tattoo needle to enter and exit the skin at high speed (rapid insertion and withdrawal), shortening the tattoo needle's residence time within the skin. Furthermore, the motion conversion mechanism is configured such that, within a reciprocating motion cycle, the forward stroke duration is shorter than the reverse stroke duration, and the average speed in the forward stroke is greater than the average speed in the reverse stroke, further improving insertion speed. A rotary motor tattoo machine employing this motion conversion mechanism can achieve faster needle penetration without increasing motor speed.

[0020] The angle between the linear motion trajectory of the driving member restricted by the drive guide rail and the line connecting the two endpoints of the circular motion trajectory of the swinging member and the first hinge point of the connecting rod is greater than or equal to 30 degrees. The second conversion mechanism is thus configured such that, during the forward stroke of the tattoo needle driven by the driving member, the average speed of the driving member in the second half is greater than the average speed in the first half; and during the retracting stroke of the tattoo needle driven by the driving member, the average speed of the driving member in the first half is greater than the average speed in the second half. This allows the tattoo needle to quickly advance and exit the skin after entering the skin during the tattooing process, and to stay in the skin for a shorter time.

[0021] The included angle between the linear motion trajectory of the driving member restricted by the driving guide rail and the line connecting the two end points of the circular motion trajectory of the swinging member and the first hinge point of the connecting rod is 45 to 80 degrees.

[0022] The second conversion mechanism is configured such that, during the forward stroke of the tattoo needle driven by the driving member, the average speed of the driving member in the second half is at least 1.5 times the average speed of the driving member in the first half; and the second conversion mechanism is configured such that, during the retracting stroke of the tattoo needle driven by the driving member, the average speed of the driving member in the first half is at least 1.5 times the average speed of the driving member in the second half. By making the average speed in the second half of the forward stroke significantly greater than the average speed in the first half, the tattoo needle can be driven to penetrate the skin at a greater speed. By making the average speed in the first half of the retracting stroke significantly greater than the average speed in the second half, the tattoo needle can be driven to exit the skin more quickly, with a shorter retention time in the skin.

[0023] The extended line of the linear motion trajectory of the second hinge point where the connecting rod connects to the drive member intersects the arc segment of the circular motion trajectory of the connecting rod's first hinge point. This allows for improved force transmission and minimized pressure angles. This allows the direction of tension in the connecting rod to momentarily coincide with the direction of motion of the drive member, resulting in a momentary zero pressure angle. This means that the pressure angle fluctuates around zero throughout the entire motion cycle, minimizing the pressure angle.

[0024] The extension line of the line connecting the first hinge point and the second hinge point of the connecting rod coincides with the extension line of the linear motion trajectory of the second hinge point when the driving member drives the tattoo needle to move into a certain position in the second half of the forward stroke.

[0025] Wherein, the reciprocating linear motion stroke of the driving component is 2 to 5 mm.

[0026] Among them, the first conversion mechanism is configured to have a quick return characteristic. When the motor rotates at a constant speed, the swinging member performs a reciprocating swing with the quick return characteristic. During the swinging of the swinging member with the quick return characteristic, the fast swinging stroke is configured to drive the driving member to perform a forward stroke, and the slow swinging stroke is configured to drive the driving member to perform a backward stroke, thereby achieving a faster speed at the moment the tattoo needle penetrates the skin during the forward stroke without increasing the motor speed.

[0027] Among them, the first conversion mechanism includes a swing guide rod mechanism, which includes a frame, a crank, a slider, and the swing member that exists as a guide rod. The crank is connected to the motor to perform rotational motion, and the crank drives the slider to move along the swing member. The swing member swings along a fixed axis. When the motor rotates at a constant speed, the swing member swings back and forth with a quick return characteristic.

[0028] Wherein, the ratio of the average speed of the forward stroke of the tattoo needle driven by the driving member to the average speed of the backward stroke is 1.2 to 2.0.

[0029] Wherein, the first conversion mechanism is configured to have a quick return characteristic. When the motor rotates at a constant speed, the swinging member performs a reciprocating swing with the quick return characteristic. During the swinging process of the swinging member performing the quick return characteristic, the fast swinging stroke is configured to drive the driving member to perform a forward stroke, and the slow swinging stroke is configured to drive the driving member to perform a backward stroke.

[0030] Among them, the first conversion mechanism includes a swing guide rod mechanism, which includes a frame, a crank, a slider, and the swing component. The crank is connected to the motor to perform rotational motion, and the crank drives the slider to move along the swing component. The swing component swings along a fixed axis. When the motor rotates at a constant speed, the swing component swings back and forth with a quick return characteristic.

[0031] The present invention further provides a tattoo device, comprising the motion conversion mechanism for a tattoo device as described in any one of the above items.

[0032] In summary, the motion conversion mechanism for a tattoo device and the tattoo device of the present invention make the motion law of the motion conversion mechanism more conducive to the tattoo artist's operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present invention apparent.

[0034] FIG1 is a schematic diagram of an embodiment of a second motion conversion mechanism of a motion conversion mechanism for a tattoo device according to the present invention;

[0035] FIG2 is a schematic diagram of a preferred embodiment of the second motion conversion mechanism in FIG1 ;

[0036] FIG3 is a comparison diagram of the average speeds of the first half stroke and the second half stroke of the second motion conversion mechanism in FIG2 ;

[0037] FIG4 is a schematic diagram showing a comparison of the design schemes for the motion conversion mechanism of the tattoo device according to the present invention, in which the direction and position of the driving guide rail of the second motion conversion mechanism are selected;

[0038] FIG5 is a schematic diagram of an embodiment of a first motion conversion mechanism of a motion conversion mechanism for a tattoo device according to the present invention;

[0039] FIG6 is a schematic diagram of a preferred embodiment of a motion conversion mechanism for a tattoo device according to the present invention;

[0040] FIG7 is a schematic diagram showing the position of the crank at every 10° rotation during the 360° rotation of the crank in FIG6 ;

[0041] FIG8 is a schematic diagram showing the position of the driving member moving for each 10° rotation during the process of the crank rotating 180° clockwise at the 0° position in FIG7 ;

[0042] FIG9 is a schematic diagram showing the position of the driving member moving for each 10° rotation of the crank in FIG7 during the process of the crank rotating clockwise from the 180° position to the 360° position (0° position);

[0043] FIG10 is a graph showing displacement of a driving member versus time in the embodiment shown in FIG6 ;

[0044] FIG11 is a graph showing the speed of the driving member versus time in the embodiment shown in FIG6 ;

[0045] FIG12 is a comparative schematic diagram combining FIG10 and FIG11;

[0046] FIG. 13 is a schematic diagram of a tattoo device using the motion conversion mechanism shown in FIG. 6 . DETAILED DESCRIPTION

[0047] See Figure 6, which is a schematic diagram of a preferred embodiment of a motion conversion mechanism for a tattoo device according to the present invention. Figure 6 illustrates an embodiment of a motion conversion mechanism for a motor tattoo device, comprising a complete motion conversion mechanism 5 comprising a first motion conversion mechanism 10 and a second motion conversion mechanism 20. The present invention provides a motion conversion mechanism 5 for a tattoo device (tattoo machine) that converts the rotational motion of a motor into linear reciprocating motion of a drive member. This linear reciprocating motion comprises a forward stroke and a reverse stroke. The drive member directly or indirectly drives a tattoo needle in the tattoo device, which in turn performs linear reciprocating motion in the forward and reverse strokes. During a tattoo operation, the tattoo needle penetrates the skin during the forward stroke.

[0048] The first conversion mechanism 10 and the second motion conversion mechanism 20 are relatively independent in principle. The first conversion mechanism 10 converts the motor's rotational motion into the reciprocating oscillation of a swinging member 104. The second conversion mechanism 20 converts the reciprocating oscillation of the swinging member 104 into the reciprocating linear motion of a driving member 202. In this embodiment, the driving member 202 is specifically in the form of a slider.

[0049] Referring to Figures 1 and 2 , Figure 1 is a schematic diagram of an embodiment of a second motion conversion mechanism of a motion conversion mechanism for a tattoo device according to the present invention. Figure 1 also illustrates two alternative comparative schemes of the second motion conversion mechanism 20 or 20'. Figure 2 is a schematic diagram of a preferred scheme of the second motion conversion mechanism in Figure 1 . Mechanical principles allow for a variety of mechanisms capable of converting circular rotation into reciprocating oscillation. Therefore, Figure 1 does not limit the specific scheme of the first motion conversion mechanism 10; any scheme capable of achieving reciprocating oscillation is sufficient.

[0050] In Figure 1 , the swing member 104 of the first motion conversion mechanism 10 can swing back and forth at an angle of θ with point O as the center. The symbol A in the figure represents both point A in space and the location of hinge point A between the swing member 104 and the connecting rod 203. The swing member 104 is hingedly connected to the connecting rod 203 of the second motion conversion mechanism 20 at hinge point A. The symbol B in the figure represents both point B in space and the location of hinge point B between the connecting rod 203 and the driving member 202. The connecting rod 203 is hingedly connected to the driving member 202 at hinge point B. The connecting rod 203 drives the driving member 202 to reciprocate linearly along the drive guide rail 201. For comparison, Figure 1 also illustrates that at hinge point A of the swing member 104, the swing member 104 is hingedly connected to the connecting rod 203' of the second motion conversion mechanism 20'. The connecting rod 203 ′ drives the driving member 202 ′ to move back and forth linearly along the driving guide rail 201 ′ in an articulated manner at point C.

[0051] Referring to Figures 1 and 2 , when swing member 104 reciprocates within an angle θ, the swinging start point of hinge point A of swing member 104 is point A, and the swinging end point is point A4. The swinging trajectory of hinge point A is arc AA4. Arc AA4 is divided into four equal parts, forming central points A1, A2, and A3. Point A2 is the central point of the arc. The five circles illustrated in Figure 1 can be drawn with points A, A1, A2, A3, and A4 as the centers and the predetermined length of connecting rod 203 (i.e., the effective length of connecting rod 203, i.e., the distance from hinge point A to hinge point B) as the radius. The arcs of these five circles are the trajectories of the positions (represented by the position of the hinge point B) that the driving component 202 connected to the other hinge point B of the connecting rod 203 can reach when the hinge point A of the connecting rod 203 swings along the arc AA4 and passes through the five points A, A1, A2, A3 and A4 when there is no restriction on the driving guide rail 201.

[0052] In Figures 1 and 2 , the symbols B, B1, B2, B3, and B4 represent the positions of the connecting rod 203's hinge point B at points B, B1, B2, B3, and B4, respectively, when the drive member 202 reciprocates linearly along the drive guide rail 201 in the direction BB4. The distance between the two points AB = A1B1 = A2B2 = A3B3 = A4B4 = the effective length of the connecting rod 203. The length of BB4 is equal to the stroke length of the drive member 202's reciprocating linear motion along the drive guide rail 201.

[0053] In FIG1 , the symbols C, C1, C2, C3, and C4 represent the corresponding positions of the connecting rod 203''s hinge point C at points C, C1, C2, C3, and C4, respectively, when the drive member 202' reciprocates linearly along CC4 in the drive rail 201', with the connecting rod 203''s hinge point A at points A, A1, A2, A3, and A4. The distance between the two points AC = A1C1 = A2C2 = A3C3 = A4C4 = the effective length of the connecting rod 203'. The length of CC4 is equal to the stroke length of the drive member 202''s reciprocating linear motion along the drive rail 201'.

[0054] The length of the quartered arc is AA1 = A1A2 = A2A3 = A3A4. Assuming a uniform oscillation, the time taken to swing from point A to point A1, then from point A1 to point A2, then from point A2 to point A3, and finally from point A3 to point A4 is identical, each accounting for 1 / 4 of the total time of a single unidirectional oscillation. During each 1 / 4 time period, the corresponding distances moved by the drive member 202 are BB1, B1B2, B2B3, and B3B4. The corresponding distances moved by the drive member 202' are CC1, C1C2, C2C3, and C3C4. As can be seen in the figure, the lengths of BB1, B1B2, B2B3, and B3B4 clearly increase gradually, with a relatively large gradient of length change. However, the lengths of CC1, C1C2, C2C3, and C3C4 do not change significantly, remaining essentially the same. In Figure 1 , measurements using computer-assisted drawing methods reveal that the displacement-length ratio BB1:B1B2:B2B3:B3B4 is 1:2.36:3.53:4.50. The displacement-length ratio BB2:B2B4 is 2.39. These measurement data indicate that as drive member 202 moves from point B to point B4, its speed increases significantly within this travel range. The displacement achieved in the second half of the travel is 2.39 times that achieved in the first half. The displacement achieved in the last quarter of the travel is 4.5 times that achieved in the first quarter. Measurements using computer-assisted drawing methods reveal that CC1:C1C2:C2C3:C3C4 is 1:1.04:1.06:1.07. The displacement-length ratio CC2:C2C4 is 1.04. The plotted measurement data indicate that the acceleration of drive member 202 is significantly greater than that of drive member 202'. In the motion conversion mechanism of the present invention, the slider acts as a driving member to directly or indirectly drive the tattoo needle, allowing the acceleration stroke to be used as the stroke to drive the tattoo needle forward into the skin. Clearly, when swinging member 104 swings in the reverse direction, the reverse displacement motion pattern of driving member 202 is mirror-symmetrical to the forward displacement pattern. When driving member 202 moves in the reverse direction from point B4 to point B, its speed decreases significantly from fast to slow within this range of motion. Theoretically, assuming a uniform swing motion, utilizing the motion pattern of driving member 202 can drive the tattoo needle to penetrate and exit the skin at a relatively high speed, resulting in a shorter retention time within the skin. Furthermore, the motion pattern of driving member 202 is significantly superior to that of driving member 202'.

[0055] Observing and analyzing Figure 1, the five circles drawn with points A, A1, A2, A3, and A4 as centers and the effective length of connecting rod 203 as radius intersect one another. Near the intersection of the arcs, the distance between the arcs changes significantly. For example, a line BB4 is drawn near the intersection of the arcs. This line BB4 forms intersections with the arc at points B, B1, B2, B3, and B4. The distances between adjacent points at points B, B1, B2, B3, and B4 increase significantly. During reverse motion, the distances between adjacent points at points B4, B3, B2, B1, and B decrease significantly. Furthermore, a line CC4 is drawn away from the intersection of the arcs. This line CC4 forms intersections with the arc at points C, C1, C2, C3, and C4. The distances between adjacent points at points C, C1, C2, C3, and C4 do not change significantly, and are barely perceptible visually in Figure 1.

[0056] Through the above analysis, those skilled in the art can use computer-aided drawing methods to design a linear motion segment with a significant speed increase and a significant speed decrease in the reverse direction near the intersection of the arc lines of the five circles, such as BB4. The length of this linear motion segment can be used as the stroke of the slider, and the appropriate stroke length can be further designed and selected by scaling up or down. The direction or position of this linear motion segment can also be adjusted to design and select an appropriate stroke length. In addition, the analysis can also conclude that: if the arc length of arc AA4 is changed, for example, the arc length of AA4 is lengthened, point A4 is farther away from point A, which is equivalent to increasing the swing angle of the first motion conversion mechanism, and correspondingly, the position of point B4 will also be changed, that is, the length of the linear motion segment of BB4 will become larger. Therefore, it is also possible to design and select an appropriate stroke length by changing the swing angle.

[0057] See FIG3, which is a comparison of the average speeds of the first half stroke and the second half stroke of the second motion conversion mechanism in FIG2, showing the comparison of the average speeds of the first half stroke and the second half stroke of the second motion conversion mechanism 20. In FIG3, the dotted line BB4 corresponding to FIG1 and FIG2 is divided into two equal parts, B M The middle dividing point of the dotted line BB4. M =B M B4, BB M is the first half of the forward stroke of the driving member 202, B M B4 is the second half of the forward stroke of the driving member 202. M As the center of the circle, draw a circle with the effective length of the connecting rod 203 (the length of the line segment AB, or the distance between points A4 and B4) as the radius, and the intersection point A of the circle and the arc AA4 is M The driving member 202 moves to the middle point B MThe position of the hinge point A of the connecting rod 203 at point A is also the position of the hinge point A on the swing member 104 of the first conversion mechanism 10, which swings from point A to point A4 through point A. M The position of point A. Using computer-aided drawing method to measure arc A M The length of A4 is 32.67% of the length of arc AA4. M The length is 67.33% of the length of arc AA4. Assuming that swinging member 104 swings at a constant speed, the first half of the forward stroke of driving member 202 (at hinge point B) occupies 67.33% of the total stroke time, while the second half of its forward stroke occupies 32.67% of the total stroke time. During the forward movement of driving member 202, the average speed in the second half is 2.06 times the average speed in the first half. The motion pattern of driving member 202 during the retreat stroke is mirror-symmetrical to that of the forward stroke. That is, the first half of the retreat stroke of driving member 202 occupies 32.67% of the total stroke time, and the average speed in the first half of the retreat stroke is 2.06 times the average speed in the second half.

[0058] FIG2 illustrates an example of dividing the swing trajectory of the hinge point A of the swing member 104 into four equal parts. In other design processes, the swing trajectory can also be divided into more equal parts, such as 36 equal parts, 360 equal parts, or even more. The more equal parts are divided, the more detailed the motion analysis of the drive member 202 can be, and the average speed of the drive member 202 in each of the detailed motion intervals can be evaluated. If the time period is very short, it can be roughly regarded as the instantaneous speed.

[0059] See Figure 4, which is a schematic diagram comparing the design options for the direction and position of the second drive rail for the motion conversion mechanism of the tattoo device according to the present invention. This diagram can also be understood as a comparison diagram of the motion trajectory of the second hinge point of connecting rod 203, or as a comparison diagram of the motion trajectory of the slider. Figure 4 illustrates how the direction and position of the drive rail are designed so that, when the dashed line (the extended motion trajectory) representing the motion direction of the second hinge point constrained by the drive rail points toward arc AA4, a relatively small angle is achieved between connecting rod 203 and drive rail 201 (the direction of slider motion), resulting in a minimal or even instantaneous overlap between the velocity direction and the force direction of driving member 202. This results in a smaller pressure angle for the slider's movement, resulting in better force transmission performance from connecting rod 203 to driving member 202. That is, when the extension of the second hinge's trajectory (the direction of the slider's trajectory) intersects arc AA4, the dotted line representing the extension of the second hinge's trajectory, constrained by the driven guide rail, can point to any point on arc AA4, A1, A2, A3, or A4, or any interval between them. By properly selecting the direction and position of the driven guide rail, a smaller slider pressure angle can be achieved. In Figure 4, dotted line EE4 points to point A2 and intersects line AA4 at an angle of 30 degrees. EE1:E1E2:E2E3:E3E4 = 1:1.20:1.34:1.43. EE2:E2E4 = 1.26. Dotted line DD4 points to point A2 and intersects dotted line AA4 at an angle of 45 degrees. DD1:D1D2:D2D3:D3D4 = 1:1.45:1.82:2.10. DD2:D2D4 = 1.60. The dotted line FF4 points to point A2, and the intersection angle with the dotted line AA4 is 67.84 degrees. F and F1 coincide, F1F2:F2F3:F3F4=1:1.92:2.73. FF2:F2F4=4.64. In Figure 4, as in Figure 1, when the direction of the slider's motion trajectory (the direction of the drive guide rail) is along the dotted line CC4, the slider's front and back half speed ratio is 1.04, and almost no speed change occurs. Observing Figure 4 and combining it with the measurement data, it can be concluded that when the dotted line points and intersects with the arc AA4, the greater the angle of the dotted line representing the slider's motion trajectory (the direction of the drive guide rail) and the dotted line AA4, the greater the speed change gradient and the greater the front and back half speed ratio.

[0060] Dashed line FF4 points toward point A2 and intersects with dashed line AA4 at an angle of 67.84 degrees. F and F1 coincide, meaning the slider moves zero distance during the initial quarter of its reciprocating linear motion. The dashed line FF4 shown in Figure 4 is the direction of the largest velocity gradient change among the indicated dashed lines, and represents the maximum front-to-back half-stroke speed ratio. When the dashed line representing the slider's trajectory (the direction of the drive rail) intersects with dashed line AA4 at an angle greater than that of dashed line FF4 (greater than 67.84 degrees), the slider will experience a short reciprocating shift at the starting point of its reciprocating linear motion, during the initial quarter of its motion, or even half of its motion, and in the first half of its stroke, before continuing to complete the full reciprocating linear motion. This type of motion still yields a greater front-to-back half-stroke speed ratio, with the initial movement allowing the tattoo needle to remain in the needle tip longer and absorb more ink. However, as the angle approaches 90 degrees, the short reciprocating distance of the slider at the starting point of the reciprocating linear motion, during the initial quarter or even half of the time, increases, gradually approaching the total stroke length. This can cause the tattoo needle to pierce the skin a second time during the entire stroke, shortening the total stroke. Therefore, when approaching 90 degrees, the slider's motion patterns are somewhat unique and should be used with caution. Angles between 30 and 80 degrees are suitable for selecting the dotted direction of the slider's motion trajectory (drive rail) with a significant front-to-back half-speed ratio. For example, angles of 30, 45, and 80 degrees are possible. The larger the front-to-back half-speed ratio, the better; it should be at least greater than 1.5 to achieve a significant effect.

[0061] It should also be noted that due to the greater resistance of the tattoo needle to piercing the skin, the tattoo machine needs to be more powerful in the second half of the forward stroke. Preferably, the pressure angle should be minimized within this interval. That is, the direction of the line connecting the two hinge points A and hinge point B of the connecting rod 203 is roughly consistent with the movement direction of the driving member 202 (the direction of the driving guide rail 201) when the driving member 202 enters the second half of the forward stroke. In this way, the angle between the connecting rod 203 and the movement direction of the driving member 202 can be minimized during the period when the tattoo needle pierces the skin, and the pressure angle can be minimized. In the specific design, it can be set to A of the arc AA4. M Segment A4, for example, points to A3, or can be understood as the extension of the straight line segment of the motion trajectory of the second hinge point B and the arc segment of the motion trajectory of the first hinge point A intersecting at A3.

[0062] Refer to Figure 5, which is a schematic diagram of an embodiment of the first motion conversion mechanism of the motion conversion mechanism for a tattoo device according to the present invention. Figure 5 illustrates an embodiment of the first motion conversion mechanism 10. In this embodiment, the first motion conversion mechanism 10 is a slider-crank oscillation mechanism, which converts the rotational motion of a crank 102 into the reciprocating oscillation of a guide rod. The oscillating guide rod mechanism comprises a frame 101, a crank 102, a slider 103, and an oscillating member 104. In this embodiment, the oscillating member 104 is a guide rod. Driven by a motor, the crank 102 rotates about point P. Driven by the rotation of the crank 102, the slider 103 moves along the guide rod (i.e., the oscillating member 104), driving the oscillating member 104 to oscillate about a fixed axis. The oscillation center O of the oscillating member 104 is the hinge point O connecting the oscillating member 104 to the frame 101. In this embodiment, the oscillating member 104 oscillates back and forth over an angle range of θ.

[0063] The swing guide rod mechanism is a quick return mechanism. A quick return mechanism refers to a connecting rod mechanism in which, while the active member rotates at a constant speed, the average speed of the reciprocating driven member in one stroke is greater than the average speed of another stroke. This quick return feature is widely used in production equipment. It can reduce the average speed of the working stroke, thereby stabilizing the working stroke and accelerating the speed of the non-working stroke, thereby reducing non-working time and improving work efficiency. However, for tattoo machine applications, the fast stroke should be the working stroke (i.e., the forward stroke for piercing the skin), while the slow stroke should be the retracting stroke for the tattoo needle. In this embodiment of the present invention, the first motion conversion mechanism 10, which utilizes a swing guide rod mechanism, exhibits quick return properties, maintains a constant transmission angle of 90 degrees, and has a pressure angle of zero, resulting in excellent force transmission performance.

[0064] FIG6 shows a complete motion conversion mechanism 5 including a first motion conversion mechanism 10 and a second motion conversion mechanism 20. The first motion conversion mechanism 10 and the second motion conversion mechanism 20 are hingedly connected at point A, also known as hinge point A. The swinging member 104 drives hinge point A on the connecting rod 203 to swing in an arc centered at point O. The swing trajectory of point A is arc AA4.

[0065] Referring to Figures 5 and 6 , crank 102 rotates clockwise in a constant circular motion. When hinge point Q on crank 102 and slider 103 rotates clockwise from point Q to point Q4, crank 102 rotates by an angle of 180°-θ. This causes hinge point A on swing member 104 to swing from point A to point A4. Simultaneously, connecting rod 203 drives driving member 202 from point B to point B4, allowing driving member 202 to complete the tattoo needle's forward stroke. When hinge point Q on crank 102 and slider 103 rotates further clockwise from point Q4 back to point Q, crank 102 rotates by an angle of 180°+θ. This causes hinge point A on swing member 104 to swing from point A4 back to point A. Simultaneously, connecting rod 203 drives driving member 202 in the opposite direction from point B4 back to point B, allowing driving member 202 to complete the tattoo needle's backward stroke. The crank 102 continues to rotate, and the process repeats itself.

[0066] During one cycle of uniform 360° rotation of the crank 102, hinge point A on the swing member 104 and hinge point B on the drive member 202 each complete a reciprocating motion. The ratio of the time spent on their retraction stroke to their forward stroke is K, where K = (180° + θ) / (180° - θ). K is also the ratio of the average speed of the fast stroke to the average speed of the slow stroke. This value is known as the quick-return coefficient. The larger the K value, the more pronounced the mechanism's quick-return characteristic. When K = 1, the mechanism has no quick-return characteristic. In the embodiment shown in Figures 5 and 6, θ = 28.96° can be measured using computer-aided drawing methods, resulting in a calculated K = (180 + 28.96) / (180 - 28.96) = 1.38. By utilizing the quick-return characteristic and treating the fast stroke as the forward stroke while maintaining the tattoo machine's motor speed, the instantaneous speed of the tattoo needle penetrating the skin can be increased. When θ = 60°, K = (180 + 60) / (180 - 60) = 2. The larger the K value, the greater the instantaneous speed at which the tattoo needle penetrates the skin. However, this also places a high demand on the power output of the tattoo machine's motor. A high-power motor also increases the size and weight of the tattoo machine, and excessive speed variations also increase operating noise. For the present invention, a K value between 1.2 and 2.0 is a suitable choice, for example, 1.2, 1.4, 1.6, 1.8, or 2.0.

[0067] See Figure 7, which is a schematic diagram of the crank position at each 10° rotation during a 360° rotation of the crank shown in Figure 6. Figure 7 divides the 360° rotation of the crank 102 into 36 equal parts, representing the position of the crank 102 at each 10° rotation clockwise starting from the initial 0° position.

[0068] Refer to Figure 8, which is a schematic diagram of the position of the driving member moving every 10° rotation when the crank in Figure 7 rotates 180° clockwise starting from the 0° position. Figure 8 expresses the position of the driving member 202 moving every 10° rotation when the crank in Figure 7 rotates 180° clockwise starting from the 0° position. During this process, the swing member 104 passed through the positions of point A and point A4, and the driving member 202 passed through the positions of point B and point B4. In Figure 8, the arc AA4 and the straight line BB4 are crossed once every 10° rotation of the crank, and a total of 18 times. Each intersection on BB4 is the corresponding position of point B on the driving member 202 that acts as a slider every 10° rotation of the crank. The distance between two adjacent intersections is the displacement of the driving member 202 within the time of 10° rotation of the crank.

[0069] See Figure 9, which illustrates the position of the drive member 202 corresponding to each 10° rotation as the crank rotates clockwise from 180° to 360° (0°) in Figure 7. Figure 9 illustrates the position of the drive member 202 corresponding to each 10° rotation as the crank rotates clockwise from 180° to 360° (0°) in Figure 7. In Figure 9, arc AA4 and line BB4 are again intersected 18 times.

[0070] Referring to Figures 10 and 11, Figure 10 is a graph of the displacement of the drive member versus time for the embodiment shown in Figure 6. Figure 11 is a graph of the speed of the drive member versus time for the embodiment shown in Figure 6. Figure 12 is a combined comparative diagram of Figures 10 and 11. When the crank 102 rotates at a constant speed, the time required for each 10° rotation is consistent. Time and angle are directly proportional. Combining Figures 6 to 9, it can be seen that during a 360° rotation of the crank 102, the time is divided into 36 equal parts. Correspondingly, the position of the drive member 202 at each time point and the displacement of each time period can be measured in the graphs. The displacement value divided by the time period yields the average speed for that time period. In this way, a rotation of the crank 102 can be divided into more equal parts, for example, 360 equal parts, with a corresponding position graph generated for each 1° rotation, thus obtaining more data. Using this data, a displacement-time curve of the drive member 202 can be plotted, as shown in Curve 1 in FIG10 . Alternatively, a velocity (average over a corresponding time period)-time curve can be plotted, as shown in Curve 2 in FIG11 . This velocity curve 2 reflects the approximate velocity of the drive member 202 at the corresponding time point (the average velocity over the corresponding time period). During the plotting and measurement process, the closer the angular divisions, the more accurate the velocity of the drive member 202. These velocity values ​​also reflect the velocity of the tattoo needle during its forward and backward movements. As mentioned in the Background, the motion conversion mechanisms of prior art rotary motor tattoo machines are typically sinusoidal or in-line slider-crank mechanisms. The displacement of the tattoo needle driven by these motion conversion mechanisms is sinusoidally proportional to the motor's rotation angle. Therefore, FIG10 also plots a displacement-time curve 3 for the sinusoidal mechanism at the same stroke for comparison; and FIG11 also plots a velocity-time curve 4 for the sinusoidal mechanism at the same stroke for comparison. In conjunction with FIG10 , Curve 2 or Curve 4 can also be understood as velocity-versus-angle and position curves. Assume the tattoo machine has a stroke of 3.5 mm and a skin penetration depth of 1.75 mm. Figure 12 combines the curves in Figure 10 with those in Figure 11. Comparing curves 1 and 3 in Figure 12, we can see that curve 1 exhibits superior motion characteristics, resulting in a shorter needle dwell time in the skin. Comparing curves 2 and 4 in Figure 12, we can see that curve 2 exhibits superior motion characteristics, resulting in a greater instantaneous needle penetration velocity. This demonstrates that the motion conversion mechanism provided by the present invention offers significant advantages over conventional rotary motor tattoo machines.

[0071] Those skilled in the art will appreciate that there are a variety of mechanical transmission mechanisms that can convert rotational motion into reciprocating swinging motion. The first motion conversion mechanism 10 in the technical solution of the present invention adopts a swinging guide rod mechanism, and the swinging guide rod mechanism is a derivative planar four-bar mechanism evolved from a planar four-bar mechanism. In the planar four-bar mechanism, the crank rocker mechanism can also convert rotational motion into reciprocating swinging motion, and also has a quick return characteristic, which can be used as another option for the specific structure of the first motion conversion mechanism 10 in the technical solution of the present invention. However, since the transmission angle of the swinging guide rod mechanism is always 90 degrees and its pressure angle is 0, it has good force transmission performance, so the swinging guide rod mechanism is the preferred choice for the first motion conversion mechanism 10 in the technical solution of the present invention.

[0072] On the other hand, in the motion conversion mechanism of the present invention for a tattoo device, if a swinging guide rod mechanism with a large quick-return coefficient K is employed, and a rapid swing stroke is configured to drive the drive member 202 forward and a slow swing stroke is configured to drive the drive member 202 backward, thereby increasing the instantaneous speed of the tattoo needle penetrating the skin, this technical solution significantly outperforms prior art motor tattoo devices with sinusoidal motion patterns. In this case, there is no need to overly demanding a significant speed-increasing characteristic of the second motion conversion mechanism. Specifically, there are no requirements for the speed configuration (setting) of the second conversion mechanism, and there is no need to specifically limit the average speed of the drive member 202 in the first and second halves. For example, using dashed lines EE4 or CC4 in FIG. 4 as the motion trajectory of the drive member also offers advantages over current conventional motor tattoo devices. However, if the first motion conversion mechanism exhibits a quick-return characteristic and the second motion conversion mechanism exhibits a significant speed-increasing characteristic, such as using dashed lines BB4 or FF4 in FIG. 4 as the motion trajectory of the drive member, the tattoo device's motion characteristics are even more pronounced. Due to the large speed fluctuations, higher motor power requirements are also required. Tattoo machine design can be tailored to the artist's preferences, emphasizing either insertion speed or a shorter needle dwell time (a significantly increased forward stroke speed and a significantly decreased return stroke speed, with a larger ratio of average speeds between the front and back strokes). Alternatively, a higher-power motor can be used to prioritize both.

[0073] Figure 13 is a schematic diagram of a tattoo device employing the motion conversion mechanism shown in Figure 6 . In Figure 13 , the tattoo device 500 includes a body 400 and a bundle of tattoo needles 300 mounted on the body 400. The tattoo needle bundle 300 can be mounted on the body 400 as a tattoo needle assembly (commonly known as an "integrated needle," a pre-assembled module comprising a tattoo needle bundle and a needle tip), or the tattoo needle bundle 300 and the tattoo needle tip 320 can be mounted on the body 400 as separate components. The body 400 includes the motion conversion mechanism 5 shown in Figure 6 . A motor 105 mounted on the frame 101 rotates the crank 102, thereby causing the swinging member 104 of the first motion conversion mechanism 10 to swing. The first motion conversion mechanism 10 is connected to the second motion conversion mechanism 20 via a hinge point A, thereby driving the drive member 202 in reciprocating linear motion. The driving member 202 drives the tattoo needle bundle 300 to perform reciprocating linear motion, or the driving member 202 and an elastic member (not shown) inside the tattoo needle assembly jointly drive the tattoo needle bundle 300 to perform reciprocating linear motion.

[0074] In the technical solution of the present invention, the "slider" is a driving member that can slide along a guide rail. Its actual physical shape is not necessarily a block. For example, the slider can be a rod-shaped member that slides within a guide rail groove; it can also be a sleeve-shaped member that slides on a guide rod, or it can partially have a rod or block shape. The "swinging member" is a swinging member that can be defined as a rocker rod, or it can be a member that is not limited to a rod-shaped member. The swinging member can also be sleeve-shaped, or it can partially have a rod or sleeve shape. The crank 102 is driven to rotate by the motor 105. The crank can be attached to the motor rotor shaft or can be integrally manufactured and mounted on the motor rotor. The frame 101 can be a tattoo machine housing or frame. The drive rail 201 can be a slot, hole, or rod-shaped. The drive rail 201 can be formed in the tattoo machine housing or frame, or it can be fixedly mounted on the tattoo machine housing or frame.

[0075] Those skilled in the art will understand that skin thickness varies from person to person, and even within the same person, so there's no strict measurement for the depth of skin penetration. Tattoo artists may use different strokes depending on their operating techniques. For example, if the needle tip moves against the skin, the tattoo machine's stroke can be relatively short, such as 3.0mm to 3.5mm, with half the needle's stroke extending out of the tip and penetrating the skin, while the other half remains within the tip. For example, if the tattoo machine's stroke is 4.2mm and the needle's penetration depth is 1.75mm or 1.5mm, the point where the needle penetrates the skin isn't necessarily the midpoint of the stroke. The second half of the forward stroke can be understood as the distance from the midpoint to the final point, or it can also be understood to include the stroke that includes skin penetration.

[0076] It is to be understood that any range of values ​​herein is intended to specifically include any intervening value or sub-range in the given range, and that all such intervening values ​​and sub-ranges are individually and specifically disclosed.

[0077] It is also understood that the words "a" and "an" mean "one or more" or "at least one," and that any singular form is intended to encompass the plural. It is further understood that the terms "including" and "comprising" include any variations thereof and are intended to be open-ended, meaning "including, but not limited to," unless expressly stated to the contrary. When a list of items is provided herein with "or" preceding the last item, any one of the listed items or any appropriate combination of two or more of the listed items may be selected and used.

[0078] Of course, the embodiments of the present invention described above are intended to be illustrative and non-limiting. The described embodiments are susceptible to various modifications in form, arrangement of parts, details, and sequence of operations. It is the intent of the present invention, as defined in the claims, to include all such modifications within the scope thereof.

[0079] In summary, the motion conversion mechanism and tattoo device of the present invention optimize the motion pattern of the motion conversion mechanism for tattoo artists. Using the motion conversion mechanism and tattoo device of the present invention allows for high-speed entry and exit of the tattoo needle within the skin (rapid penetration and rapid exit), shortening the tattoo needle's residence time within the skin. A rotary motor tattoo machine employing this motion conversion mechanism can achieve even faster needle penetration speed.

[0080] As described above, for ordinary technicians in this field, various other corresponding changes and modifications can be made based on the technical solutions and technical concepts of the present invention, and all these changes and modifications should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A motion conversion mechanism for a tattoo device, comprising: a first conversion mechanism for converting the rotary motion of the motor into the reciprocating swing of the swing member, and a second conversion mechanism for converting the reciprocating swing of the swing member into the reciprocating linear motion of the driving member; The second conversion mechanism includes a connecting rod, a driving component that directly or indirectly drives the tattoo needle, and a driving guide rail that limits the driving component to perform linear motion; the connecting rod is connected to the swinging component of the first conversion mechanism in an articulated manner at a first hinge point, and the connecting rod is connected to the driving component in an articulated manner at a second hinge point. When the swinging component swings back and forth, the first hinge point performs reciprocating swings with a circular arc as a motion trajectory between two end points, and the second hinge point is limited by the driving guide rail and performs reciprocating linear motion with a straight line segment as a trajectory between two end points, and the connecting rod drives the driving component to perform linear reciprocating motion along the driving guide rail.

2. The motion conversion mechanism for a tattoo device according to claim 1, wherein: The angle between the direction of the linear motion trajectory of the driving member restricted by the driving guide rail and the line connecting the two end points of the circular motion trajectory of the swing member and the first hinge point of the connecting rod is greater than or equal to 30 degrees, thereby configuring the second conversion mechanism so that in the forward stroke of the tattoo needle driven by the driving member, the average speed of the driving member in the second half is greater than the average speed in the first half; In the retreat stroke of the tattoo needle driven by the driving component, the average speed of the driving component in the first half is greater than the average speed in the second half, so that the tattoo needle can quickly advance and quickly withdraw from the skin after piercing the skin during the tattoo process, and stay in the skin for a shorter time.

3. The motion conversion mechanism for a tattoo device according to claim 2, wherein: The angle between the linear motion trajectory direction of the driving member restricted by the driving guide rail and the line connecting the two end points of the circular motion trajectory of the swing member and the first hinge point of the connecting rod is 45 degrees to 80 degrees.

4. The motion conversion mechanism for a tattoo device according to claim 1, wherein: The second conversion mechanism is configured so that, in a forward stroke of the driving member driving the tattoo needle, the average speed of the driving member in the second half is more than 1.5 times the average speed of the driving member in the first half; the second conversion mechanism is configured so that, in a backward stroke of the driving member driving the tattoo needle, the average speed of the driving member in the first half is more than 1.5 times the average speed of the driving member in the second half.

5. The motion conversion mechanism for a tattoo device according to claim 2, wherein: The second conversion mechanism is configured so that, in a forward stroke of the driving member driving the tattoo needle, the average speed of the driving member in the second half is more than 1.5 times the average speed of the driving member in the first half; the second conversion mechanism is configured so that, in a backward stroke of the driving member driving the tattoo needle, the average speed of the driving member in the first half is more than 1.5 times the average speed of the driving member in the second half.

6. The motion conversion mechanism for a tattoo device according to claim 2, wherein: The extension line of the linear motion trajectory of the second hinge point where the connecting rod is connected to the driving member intersects with the arc segment of the circular motion trajectory of the first hinge point of the connecting rod.

7. The motion conversion mechanism for a tattoo device according to claim 2, wherein: When the driving member drives the tattoo needle to move forward and enters a certain position in the second half of the forward stroke, the extended line of the line connecting the first hinge point and the second hinge point of the connecting rod coincides with the extended line of the linear motion trajectory of the second hinge point.

8. The motion conversion mechanism for a tattoo device according to claim 1, wherein: The stroke of the reciprocating linear motion of the driving member is 2 to 5 mm.

9. The motion conversion mechanism for a tattoo device according to claim 1, wherein: The first conversion mechanism is configured to have a quick-return characteristic. When the motor rotates at a constant speed, the swinging member performs a reciprocating swing with the quick-return characteristic. During the swinging of the swinging member with the quick-return characteristic, a fast swinging stroke is configured to drive the driving member to perform a forward stroke, and a slow swinging stroke is configured to drive the driving member to perform a backward stroke, thereby achieving a faster speed at which the tattoo needle penetrates the skin during the forward stroke without increasing the motor speed.

10. The motion conversion mechanism for a tattoo device according to claim 9, wherein: The first conversion mechanism includes a swing guide rod mechanism, which includes a frame, a crank, a slider, and the swing component. The crank is connected to the motor for rotational motion, and the crank drives the slider to move along the swing component. The swing component swings along a fixed axis. When the motor rotates at a constant speed, the swing component swings back and forth with a quick return characteristic.

11. The motion conversion mechanism for a tattoo device according to claim 9, wherein: The ratio of the average speed of the forward stroke of the tattoo needle driven by the driving member to the average speed of the backward stroke is 1.2-2.

0.

12. The motion conversion mechanism for a tattoo device according to claim 2, wherein: The first conversion mechanism is configured to have a quick-return characteristic. When the motor rotates at a constant speed, the swing component performs a reciprocating swing with the quick-return characteristic. During the swinging process of the swing component performing the quick-return characteristic, the fast swinging stroke is configured to drive the driving component to perform a forward stroke, and the slow swinging stroke is configured to drive the driving component to perform a backward stroke.

13. The motion conversion mechanism for a tattoo device according to claim 2, wherein: The first conversion mechanism includes a swing guide rod mechanism, which includes a frame, a crank, a slider, and the swing component. The crank is connected to the motor for rotational motion, and the crank drives the slider to move along the swing component. The swing component swings along a fixed axis. When the motor rotates at a constant speed, the swing component swings back and forth with a quick return characteristic.

14. A tattoo device, comprising the motion conversion mechanism for a tattoo device according to claim 1.

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