Motion conversion mechanism for tattooing device and tattooing device

Abstract

The invention relates to a motion conversion mechanism for a tattooing device and the tattooing device. The motion conversion mechanism comprises a first conversion mechanism (10) used for converting rotary motion of a motor into reciprocating swing of a swing component (104) and a second conversion mechanism (20) used for converting the reciprocating swing of the swing component (104) into reciprocating linear motion of a driving component (202). The second conversion mechanism (20) is configured in a way that the average speed of the rear half of the driving component (202) is greater than the average speed of the front half of the driving component (202) in the forward stroke of the driving component (202) for driving the tattooing needle; the second switching mechanism (20) is configured in such a way that the average speed of the first half of the driving member (202) is greater than the average speed of the second half of the driving member (202) during the rollback stroke of the driving member (202) driving the tattooing needle. According to the motion conversion mechanism for the tattooing device and the tattooing device, the motion rule of the motion conversion mechanism is more beneficial to the operation of a tattooist.

Description

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 tattoo devices and the tattoo devices. Background Art

[0002] The tattoo device generally includes a tattoo needle for applying ink to the skin and a tattoo machine that can drive the tattoo needle to reciprocate. During operation, the tattoo machine drives the tattoo needle moistened by the ink to reciprocate forward and backward, thereby repeatedly piercing the skin of the tattooer and driving the insoluble ink particles into the dermis of the skin.

[0003] The tattoo process is the process in which the tattoo artist moves the tattoo machine on the skin, and the tattoo needle reciprocates and pierces the skin at a high frequency during the movement. In many cases, the goal of the tattoo artist when adjusting the tattoo machine is that the tattoo needle is roughly halfway into the skin and halfway out of the skin during its stroke. For example, the tattoo machine stroke is 3.5 mm, and the tattoo needle reciprocates forward and backward strokes, which is the same as the tattoo machine, which is 3.5 mm, and the depth of penetration into the skin is 1.75 mm. Roughly the middle point of the forward stroke and the backward stroke is the point where the tattoo needle pierces the skin and exits the skin. The tattoo machine can drive the tattoo needle to move forward and backward in a straight line; or the tattoo machine can only be responsible for driving the tattoo needle forward, and during the backward motion, the tattoo needle is driven by the elastic member inside the tattoo needle assembly to follow the tattoo machine backward. This forms 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] The electromagnetic coil tattoo machine relies on the electromagnetic coil to generate electromagnetic attraction by high-frequency switching on and off, and the mechanical elastic force of a spring sheet interacts to drive an armature to swing at a high frequency. One end of the armature drives the tattoo needle or drives a push rod, and this push rod drives the tattoo needle to reciprocate in a straight line. The electromagnetic attraction of the electromagnetic coil to the armature is in a cubic ratio to the distance. The process of the tattoo needle piercing the skin is the process of this distance shrinking, during which the electromagnetic attraction increases greatly, and the tattoo needle piercing the skin has an accelerated impact process. The tattoo needle retracts by the bent spring sheet driving the armature to swing back. Usually the retraction speed is lower than the insertion speed.

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

[0007] The rotary motor tattoo machine has a mechanism inside that converts the motor's rotary motion into linear reciprocating motion. This motion conversion mechanism is usually a sine mechanism or an in-lineslider-crank mechanism. The relationship between the stroke displacement of the tattoo needle driven by this conversion mechanism and the motor's rotational position angle is roughly a sine curve.

[0008] The mechanical structure principle of the rotary motor tattoo machine can refer to, for example, U.S. Patent No. US9393395B2, (inventors AdamCarl Miller, Igor Evguenievich Chak), U.S. Patent No. US5741290 (inventor Ta-ChingHsieh), 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 tattoo process, the tattoo artist holds the tattoo machine and moves the tattoo needle along the skin surface. The tattoo needle reciprocates at a frequency of 60 to 150 Hz and a stroke of 2.5 mm to 5 mm. Usually, the tattoo needle penetrates the skin to a depth of 1.5 mm to 2 mm. Tattoo artists usually choose a tattoo machine with a specific stroke based on tattoo techniques and habits, such as a stroke of 3.5 mm or a stroke of 4.0 mm.

[0010] The movement of the tattoo needle is a reciprocating linear motion including a forward stroke and a retracting stroke. Generally, during the forward stroke, the first half of the stroke includes an acceleration process, the tattoo needle rushes out of the needle mouth and moves forward, and the tattoo needle pierces the skin roughly in the middle of the forward stroke. In the second half of the stroke, the tattoo needle pierces the skin and continues to move forward in the skin until it reaches a predetermined depth. The retracting stroke is when the tattoo needle that has penetrated the predetermined depth retreats in the skin until the needle tip completely withdraws from the skin. At this moment, the tattoo needle retreats roughly half of the stroke, and then continues to retreat and retreats into the needle mouth until it reaches the end of the stroke (also the starting point of the forward stroke). After the needle tip is wetted by ink in the needle mouth, it enters the next forward stroke again, and so on. During the tattoo process, during the period of time when the tattoo needle is still retained in the skin, the tattoo artist moves the tattoo needle laterally along the skin surface, which will cause the side wall of the tattoo needle tip to scratch (scrape, scrape) the skin tissue. This scratching will cause greater damage to the skin wound, which is not conducive to rapid skin healing, not conducive to high-quality tattoo effects, and may also cause the tattooed person to feel more pain. In order to avoid or reduce scratches on the needle tip, within the same time period of the reciprocating motion of the tattoo needle, the time period for the tattoo needle to penetrate the skin, advance inside the skin to reach a predetermined depth, 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] Different individuals or different parts of human skin have different elasticity and looseness. Skin with large looseness will be locally deformed (locally sunken) due to the pressure of the needle tip during the tattoo needle insertion process, resulting in insufficient tattoo depth or inconsistent tattoo depth. A large-sized tattoo needle bundle, such as a needle bundle composed of 27 needle arrays, has great resistance to skin penetration, which will cause the skin to be more severely deformed due to pressure depression. This may cause the tattoo needle to fail to penetrate normally or the penetration depth to be uneven. In this case, the tattoo needle needs to have a relatively large impact speed. For tattoo needles with relatively large penetration resistance, the greater the impact speed at the moment of penetration, the easier it is to penetrate. Some tattoo artists use this electromagnetic coil tattoo machine with high noise and heavy weight because the electromagnetic coil tattoo machine has a significant acceleration impact motion law.

[0012] Tattoo artists will choose different tattoo techniques based on factors such as tattoo patterns and skin locations. When a tattoo artist holds a tattoo machine and moves the tattoo needle along the skin surface, the tattoo needle is also piercing the skin back and forth. When the tattoo machine has a high tattoo frequency, the tattoo artist must move the tattoo machine quickly, otherwise the tattoo needle will stay in the same skin position, causing the skin to be repeatedly pierced and damaged, resulting in poor tattoo results or failure. The tattoo process is similar to the painting process, and the faster the better. If the tattoo machine runs too fast and exceeds the control (proficiency) of the tattoo artist, the tattoo artist may be forced to tattoo at a high speed, which may result in poor tattoo art results. Therefore, the tattoo machine's tattoo frequency should be set in accordance with the tattoo artist's skill level and should not be set too high.

[0013] The motor speed of a rotary motor tattoo machine can be adjusted within a relatively large range. For a rotary motor tattoo machine with a fixed stroke, the higher the speed, the higher the tattoo needle's instantaneous penetration speed. However, the high speed also leads to a high frequency. The tattoo needle reciprocates and penetrates the skin once every time the tattoo machine motor rotates one circle, so the higher the motor speed, the higher the tattoo needle's penetration frequency. In order to avoid repeated punctures in the same area, the tattoo artist must move the tattoo machine quickly with high speed and high frequency. The tattoo artist must be skilled in the technique (skilled) to cope with the high speed tattoo machine setting.

[0014] Rotary motor tattoo machines are gradually becoming the mainstream tattoo machines due to their low noise, light weight, and long-lasting and flexible operation. However, some tattoo artists insist on using electromagnetic coil tattoo machines, which are noisy and heavy, because they have significant acceleration and impact motion. If the rotary motor tattoo machine can have similar speed characteristics as the electromagnetic coil tattoo machine, it will be more convenient for tattoo artists to operate.

[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 urgently needs to be solved. 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 a 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 a reciprocating swing of a swinging member, and a second conversion mechanism for converting the reciprocating swing of the swinging member into a reciprocating linear motion of a driving member;

[0018] 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.

[0019] The mechanism of the present invention can convert the rotary motion of the motor into a linear reciprocating motion with a forward stroke and a backward stroke. The motion conversion mechanism is configured as follows: in one reciprocating stroke cycle, during the forward stroke, the average speed of the second half of the forward stroke is greater than the average speed of the first half; during the backward stroke, the average speed of the first half of the backward stroke is greater than the average speed of the second half of the backward stroke. This enables the tattoo needle to enter and exit the skin at high speed (rapid insertion and rapid withdrawal), and achieves a shorter cycle time for the tattoo needle to stay in the skin. On the other hand, the motion conversion mechanism is configured as follows: in one reciprocating motion cycle, the time taken for the forward stroke is less than the time taken for the backward stroke, and the average speed of the forward stroke is greater than the average speed of the backward stroke. This further increases the insertion speed. The rotary motor tattoo machine using this motion conversion mechanism can make the tattoo needle faster at the moment of piercing the skin without increasing the motor speed.

[0020] Among them, the angle between the direction of the motion trajectory of the driving member restricted by the driving guide rail for linear motion and the line connecting the two end points of the arc motion trajectory of the swing member and the first hinge point of the connecting rod is greater than or equal to 30 degrees, thereby the second conversion mechanism is configured so that in the forward stroke of the driving member driving the tattoo needle, the average speed of the driving member in the second half is greater than the average speed in the first half; in the retracting stroke of the driving member driving the tattoo needle, the average speed of the driving member 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.

[0021] 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 45 degrees to 80 degrees.

[0022] The second conversion mechanism is configured such that, in the 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 first half; the second conversion mechanism is configured such that, in the 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 second half. By making the average speed of the second half significantly greater than the average speed of the first half in the forward stroke, the tattoo needle can be driven to penetrate the skin at a greater speed, and by making the average speed of the first half significantly greater than the average speed of the second half in the backward stroke, the tattoo needle can be quickly withdrawn from the skin and stay in the skin for a shorter time.

[0023] 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. Thus, better force transmission performance can be achieved and the pressure angle can be minimized. In this way, the pulling direction of the connecting rod and the movement direction of the driving member can be instantly consistent, and there will be a moment when the pressure angle is zero. That is, during the entire movement cycle, the pressure angle value changes around zero, thereby minimizing the pressure angle.

[0024] Wherein, when the driving member drives the tattoo needle to move into a certain position in the second half of the forward stroke, 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.

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

[0026] 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.

[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 performs fixed-axis swing. When the motor rotates at a constant speed, the swing member performs reciprocating swings 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 1.2-2.0.

[0029] Wherein, the first conversion mechanism is configured to have a quick return characteristic. When the motor rotates at a constant speed, the 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 set to drive the driving component to perform a forward stroke, and the slow swinging stroke is set to drive the driving component 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 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.

[0031] The present invention also 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 operation of the tattoo artist. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0034] In the accompanying drawings,

[0035] Figure 1 is a schematic diagram of an embodiment of a second motion conversion mechanism of a motion conversion mechanism for a tattoo device of the present invention;

[0036] Figure 2 for Figure 1 A schematic diagram of a preferred solution of the second motion conversion mechanism;

[0037] Figure 3 for Figure 2 Comparison chart of average speeds of the first half stroke and the second half stroke of the second motion conversion mechanism;

[0038] Figure 4 A schematic diagram showing a comparison of the schemes for selecting the direction and position of the driving guide rail of the second motion conversion mechanism for the motion conversion mechanism of the tattoo device of the present invention;

[0039] Figure 5 Schematic diagram of an embodiment of a first motion conversion mechanism of a motion conversion mechanism for a tattoo device of the present invention;

[0040] Figure 6 A schematic diagram of a preferred embodiment of the motion conversion mechanism for a tattoo device of the present invention;

[0041] Figure 7 for Figure 6 Schematic diagram of the position of the crank every 10° rotation during the 360° rotation of the middle crank;

[0042] Figure 8 for Figure 7 Schematic diagram of the position of the driving member moving when the middle crank rotates 180° clockwise at the 0° position and every 10° rotation;

[0043] Fig. 9 for Figure 7 Schematic diagram of the position of the driving member moving for every 10° rotation of the middle crank from the 180° position to the 360° position (0° position);

[0044] Fig.10 for Figure 6 A graph of drive member displacement versus time for the illustrated embodiment;

[0045] Fig.11 for Figure 6 A graph of drive member speed versus time for the illustrated embodiment;

[0046] Fig.12 For the general Fig.10 and Fig.11 Comparison diagrams merged together;

[0047] Fig.13 To adopt Figure 6 A schematic diagram of a tattoo device showing the motion conversion mechanism. DETAILED DESCRIPTION

[0048] See also Figure 6 , which is a schematic diagram of a preferred embodiment of the motion conversion mechanism of the tattoo device of the present invention. Figure 6 It is an embodiment of a motion conversion mechanism of a motor tattoo machine, comprising a complete motion conversion mechanism 5 of 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), wherein the motion conversion mechanism 5 can convert the rotary motion of a motor into a linear reciprocating motion of a driving member, wherein the linear reciprocating motion includes a forward stroke and a backward stroke, wherein the driving member directly or indirectly drives a tattoo needle on the tattoo device, wherein the tattoo needle performs a linear reciprocating motion of a forward stroke and a backward stroke accordingly, and during the tattoo operation, the tattoo needle pierces the skin during the forward stroke.

[0049] The first conversion mechanism 10 and the second motion conversion mechanism 20 are relatively independent in principle. The first conversion mechanism 10 can convert the rotational motion of the motor into the reciprocating swing of a swing member 104. The second conversion mechanism 20 can convert the reciprocating swing of the swing member 104 of the first conversion mechanism into the reciprocating linear motion of the driving member 202. In this embodiment, the driving member 202 is specifically in the form of a slider.

[0050] See also Figure 1 and Figure 2 , Figure 1 FIG. 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 Two comparison schemes of the optional second motion conversion mechanism 20 or 20' are given in FIG. Figure 2 for Figure 1 Schematic diagram of the preferred solution of the second motion conversion mechanism in FIG. There are many schemes for the mechanism form that can convert circular rotation into reciprocating swing in mechanical principles, so the attached Figure 1The specific scheme of the first motion conversion mechanism 10 is not limited, as long as it can achieve reciprocating swing.

[0051] Figure 1 In the figure, the swinging member 104 of the first motion conversion mechanism 10 can make a reciprocating swing at an angle of θ with point O as the center. The mark A in the accompanying drawings indicates both the point A in space and the position of the hinge point A on the swinging member 104 and the connecting rod 203. The swinging member 104 is connected to the connecting rod 203 of the second motion conversion mechanism 20 in an articulated manner at the hinge point A. The mark B in the accompanying drawings represents both the point B in space and the position of the hinge point B on the connecting rod 203 and the driving member 202. The connecting rod 203 is connected to the driving member 202 in an articulated manner at its hinge point B. The connecting rod 203 drives the driving member 202 to reciprocate linearly along the driving guide rail 201. For comparison, the attached Figure 1 It is also shown that the swing member 104 is connected to the connecting rod 203' of the second motion conversion mechanism 20' in an articulated manner at the hinge point A of the swing member 104. The connecting rod 203' drives the driving member 202' to reciprocate linearly along the driving guide rail 201' in an articulated manner at point C.

[0052] See attached Figure 1 and attached Figure 2 When the swing member 104 swings back and forth within the angle θ, the swing starting point of the hinge point A of the swing member 104 is point A, the swing end point is point A4, and the swing trajectory of the hinge point A is arc AA4. The arc AA4 is divided into four equal parts, forming the middle equal points A1, A2 and A3. Point A2 is the middle equal point of the arc. With the five points A, A1, A2, A3 and A4 as the center of the circle and the preset length of the connecting rod 203 (the effective length of the connecting rod 203, that is, the length from the hinge point A to the hinge point B) as the radius, the following can be drawn: Figure 1 The arcs of these five circles are the trajectories of the positions (represented by the position of the hinge point B) that the driving member 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.

[0053] Attached Figure 1 and attached Figure 2In the figure, the marks B, B1, B2, B3 and B4 represent that when the driving member 202 moves back and forth in the driving guide rail 201 along the direction BB4, the hinge point A of the connecting rod 203 is at the positions of the five points A, A1, A2, A3 and A4, respectively, and the hinge point B of the connecting rod 203 is at the positions of the five points B, B1, B2, B3 and B4, respectively. 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 driving member 202 moving back and forth along the driving guide rail 201.

[0054] Attached Figure 1 In the figure, the marks C, C1, C2, C3 and C4 represent that when the driving member 202' moves back and forth in the driving guide rail 201' along the CC4 direction, the hinge point A of the connecting rod 203' is at the positions of the five points A, A1, A2, A3 and A4 respectively, and the hinge point C of the connecting rod 203' is at the positions of the five points C, C1, C2, C3 and C4 respectively. The connecting line 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 driving member 202' reciprocating linear motion along the driving guide rail 201'.

[0055] The length of the arc divided into four equal parts is AA1=A1A2=A2A3=A3A4. Assume that the swing is performed at a uniform speed, that is, 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 from point A3 to point A4 is the same, and each takes up 1 / 4 of the total time of a unidirectional swing. In each 1 / 4 time period, correspondingly, the driving component 202 moves the distances BB1, B1B2, B2B3 and B3B4 respectively. And the driving component 202' moves the distances CC1, C1C2, C2C3 and C3C4 respectively. It can be seen from the figure that the lengths of BB1, B1B2, B2B3 and B3B4 are obviously gradually increased, and the length change gradient is relatively large; while the length changes of CC1, C1C2, C2C3 and C3C4 are not significant, and are almost basically the same. Appendix Figure 1In the measurement according to the computer-aided drawing method, the displacement length ratio BB1: B1B2: B2B3: B3B4 = 1: 2.36: 3.53: 4.50. The displacement length ratio BB2: B2B4 = 2.39; From the above measurement data, it can be seen that when the driving member 202 moves from point B to point B4, the moving speed in this stroke range is significantly increased, and the displacement it moves in the second half of the time is 2.39 times the displacement it moves in the first half of the time. The displacement it moves in the last 1 / 4 time period is 4.5 times the displacement it moves in the first 1 / 4 time period. The computer-aided drawing method measures CC1: C1C2: C2C3: C3C4 = 1: 1.04: 1.06: 1.07. The displacement length ratio CC2: C2C4 = 1.04. From the drawing measurement data, it can be concluded that the acceleration change of the driving member 202 is significantly greater than that of the driving 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, and the acceleration stroke can be used as the stroke for driving the tattoo needle to advance and penetrate the skin. Obviously, when the swinging member 104 swings in the opposite direction, the displacement motion law of the driving member 202 in the opposite direction is mirror-symmetrical to the displacement law in the forward direction. When the driving member 202 moves from point B4 to point B in the opposite direction, the moving speed decreases significantly from fast to slow within this stroke range. Theoretically, assuming that the swing is a uniform motion, the motion law of the driving member 202 can be used to drive the tattoo needle to penetrate the skin at a faster speed and quickly withdraw from the skin, and the retention time in the skin is shorter. In addition, the motion law of the driving member 202 is significantly better than that of the driving member 202'.

[0056] Observation and analysis Figure 1 , five circles are drawn with points A, A1, A2, A3 and A4 as the center and the effective length of the connecting rod 203 as the radius. These five circles intersect each other. Near the intersection of the arcs, the distance between the arcs changes significantly. For example, a straight line BB4 is drawn near the intersection of the arcs, and the straight line BB4 forms intersections B, B1, B2, B3 and B4 with the arc. The distance between two adjacent points of B, B1, B2, B3 and B4 increases significantly and gradually; when moving in the opposite direction, the distance between two adjacent points of B4, B3, B2, B1 and B decreases significantly and gradually. A straight line CC4 is drawn away from the intersection area of ​​the arcs, and the straight line CC4 forms intersections C, C1, C2, C3 and C4 with the arc. The distance between two adjacent points of C, C1, C2, C3 and C4 does not change significantly. Figure 1 There is almost no visually observable change.

[0057] 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 change and a significant speed decrease change 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 show that if the arc length of arc AA4 is changed, for example, the arc length of AA4 is lengthened, point A4 is farther 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 be increased. Therefore, it is also possible to design and select an appropriate stroke length by changing the swing angle.

[0058] See also Figure 3 , which is Figure 2 The average speed comparison diagram of the first half stroke and the second half stroke of the second motion conversion mechanism in FIG. 2 shows the average speed comparison of the first half stroke and the second half stroke of the second motion conversion mechanism 20. Figure 3 In the Figure 1 and attached Figure 2 The corresponding dotted line BB4 is divided into two parts, B M It is the middle dividing point of the dotted line BB4. The length of the dotted line BB 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 A circle is drawn with the effective length of the connecting rod 203 (the length of the line segment AB, or the distance between the 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 M The 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. The hinge point A swings from point A to point A4 through point A. M The position of the point. Measuring arc A using computer-aided drawing M The length of A4 is 32.67% of the length of arc AA4. MThe length is 67.33% of the length of arc AA4. Assuming that the swinging member 104 is swinging at a uniform speed, the first half of the forward stroke of the driving member 202 (the location of the hinge point B) occupies 67.33% of the full stroke time, and the second half of its forward stroke occupies 32.67% of the full stroke time. During the forward movement of the driving member 202, the average speed of the second half is 2.06 times the average speed of the first half. The motion law of the retreat stroke of the driving member 202 is mirror-symmetrical to the motion law of the forward stroke. That is, the time occupied by the first half of the retreat stroke of the driving member 202 is 32.67% of the full stroke time, and the average speed of the first half of the retreat stroke is 2.06 times the average speed of the second half of the retreat stroke.

[0059] Attached Figure 2 This is 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 or 360 equal parts or even more. The more equal parts there are, the more detailed the motion analysis of the driving member 202 can be, and then the average speed of the driving member 202 in each detailed motion interval can be evaluated. If the time period is very short, it can be roughly regarded as the instantaneous speed.

[0060] See also Figure 4 , which is a schematic diagram for comparing the design of the motion conversion mechanism for the tattoo device of the present invention and selecting the direction and position of the driving guide rail of the second motion conversion mechanism, and can also be understood as a motion trajectory comparison diagram of the second hinge point of the connecting rod 203, or can also be understood as a motion trajectory comparison diagram of the slider. Figure 4 It expresses how to design and select the direction and position of the driving guide rail so that when the dotted line representing the movement direction of the second hinge point constrained by the driven guide rail (the extension line of the movement trajectory) points to the arc AA4, a relatively small angle between the connecting rod 203 and the driving guide rail 201 (the movement direction of the slider) can be achieved, and the angle between the speed direction and the force direction of the driving component 202 is very small or even coincides instantaneously. In this way, a smaller pressure angle of the slider movement can be achieved, that is, at this time, the connecting rod 203 drives the driving component 202 to have a better force transmission performance. That is, when the extension line of the movement trajectory of the second hinge point (the direction of the movement trajectory of the slider) intersects the arc AA4, the dotted line representing the extension line of the movement trajectory of the second hinge point constrained by the driven guide rail can point to any point A, A1, A2, A3 and A4 on the arc AA4 or the interval therebetween, and a smaller pressure angle of the slider movement can be achieved by reasonably selecting the direction and position of the driving guide rail. Attachment Figure 4The dotted line EE4 in the middle points to point A2, and the angle of intersection with the straight line AA4 is 30 degrees. EE1: E1E2: E2E3: E3E4 = 1: 1.20: 1.34: 1.43. EE2: E2E4 = 1.26. The dotted line DD4 points to point A2, and the angle of intersection with the dotted line AA4 is 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 angle of intersection 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. Figure 4 In, with Figure 1 When the slider moves in the same direction (driving guide rail direction) along the dotted line CC4, the slider speed ratio in the front and rear half is 1.04, and there is almost no speed change. Figure 4 Combined with the measurement data, it can be concluded that when the dotted line points to the intersection of arc AA4, the greater the intersection angle between the dotted line representing the direction of the slider motion trajectory (driving guide rail direction) and the dotted line AA4, the greater the speed change gradient and the greater the speed ratio between the front and rear halves.

[0061] 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, which means that the distance moved by the slider in the initial 1 / 4 time period during the reciprocating linear motion is zero. Figure 4 The dotted line FF4 shown in the figure is the direction with the largest speed gradient change among the dotted lines marked, and the front-to-back half-speed ratio is the largest. When the dotted line representing the direction of the slider's motion trajectory (driving guide direction) crosses the dotted line AA4 at an angle greater than the angle of the dotted line FF4 (the angle is greater than 67.84 degrees), the slider will have a short-distance reciprocating displacement at the starting point of the reciprocating linear motion, in the initial 1 / 4 time or even 1 / 2 time period, and in the first section of the entire stroke range, and then continue to move to complete the reciprocating linear motion of the entire stroke. This kind of movement can still obtain a larger front-to-back half-speed ratio, in which the movement in the initial stage can allow the tattoo needle to stay in the needle mouth for a longer time and pick up more ink. However, when the angle approaches 90 degrees, the distance of the short-distance reciprocating motion of the slider at the starting point of the reciprocating linear motion, in the initial 1 / 4 time or even 1 / 2 time period becomes larger, gradually approaching the total stroke length. This will cause the tattoo needle to pierce the skin twice during the entire stroke, and the total stroke will become shorter. Therefore, when approaching 90 degrees, the movement law of the slider is relatively special and should be used with caution. The angle is roughly in the range of 30 degrees to 80 degrees, which is the direction of the dotted line of the slider motion trajectory (driving guide rail) with a significant front and rear half speed ratio. For example, the angle can be selected as 30 degrees, 45 degrees, 80 degrees, etc. The larger the front and rear half speed ratio, the better, and it should be at least greater than 1.5 to have a significant effect.

[0062] It should also be pointed out that since the tattoo needle has a large resistance to piercing the skin, the tattoo machine needs to have a stronger force in the second half of the forward stroke. It is preferred to minimize the pressure angle in this interval, that is, the direction of the line connecting the two hinge points A and the 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 is in a position during 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 time 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 that the movement trajectory direction of the driving member 202 points to. 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.

[0063] See also 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 of the present invention. Figure 5 An embodiment of the first motion conversion mechanism 10 is shown. In this embodiment, the first motion conversion mechanism 10 is a slider-crank oscillation mechanism, which converts the rotational motion of the crank 102 into the reciprocating swing of the guide rod. The slider-crank oscillation mechanism includes a frame 101, a crank 102, a slider 103, and a swing member 104. In this embodiment, the swing member 104 is in the form of a guide rod. The crank 102 rotates around point P under the drive of the motor. Under the action of the rotational motion of the crank 102, the slider 103 moves along the guide rod (i.e., the swing member 104), driving the swing member 104 to swing around a fixed axis. The swing center point O of the swing member 104 is the hinge point O where the swing member 104 and the frame 101 are connected to each other. In this embodiment, the reciprocating swing angle range of the swing member 104 is θ.

[0064] The swing guide bar mechanism is a quick return mechanism. A quick return mechanism refers to a linkage mechanism in which, when the driving member rotates at a constant speed, the reciprocating driven member has a higher average speed in one stroke than in the other stroke. The characteristics of quick return motion are widely applied to production equipment. It can make the average speed of the working stroke small, so the working stroke is stable, and the speed of the non-working stroke is increased to shorten the non-working time, achieving the purpose of improving work efficiency. However, for the application characteristics of a tattoo machine, the fast stroke should be the working stroke, that is, the stroke of advancing and piercing the skin, and the slow stroke should be the stroke of the tattoo needle retracting. In this embodiment of the present invention, the first motion conversion mechanism 10 in the form of a swing guide bar mechanism has the property of quick return motion, and its transmission angle is always 90 degrees, and its pressure angle is 0, having excellent force transmission performance.

[0065] Appendix Figure 6 It is a complete motion conversion mechanism 5 including the first motion conversion mechanism 10 and the second motion conversion mechanism 20. The first motion conversion mechanism 10 and the second motion conversion mechanism 20 are hinged at point A, and point A is also the hinge point A. The swing member 104 drives the hinge point A on the connecting rod 203 to swing in an arc with point O as the center. The swing trajectory of point A is the arc AA4.

[0066] Refer to Appendix Figure 5 and Appendix Figure 6 As shown in the figure, the crank 102 rotates clockwise at a constant speed in a circular motion. When the hinge point Q between the crank 102 and the slider 103 rotates clockwise from the Q point position to the Q4 point position, the rotation angle of the crank 102 is 180° - θ; thereby driving the hinge point A on the swing member 104 to swing from the A point position to the A4 point position. At the same time, the connecting rod 203 drives the driving member 202 to move from point B to point B4, so that the driving member 202 can drive the tattoo needle to complete the forward stroke. When the hinge point Q between the crank 102 and the slider 103 continues to rotate clockwise back to the Q point position from the Q4 point position, the rotation angle of the crank 102 is 180° + θ; thereby driving the hinge point A on the swing member 104 to swing back from the A4 position to the A position. At the same time, the connecting rod 203 drives the driving member 202 to move reversely from point B4 back to point B, so that the driving member 202 can drive the tattoo needle to complete the retracting stroke during this process. The crank 102 continues to rotate, and so on in a cycle.

[0067] During a cycle of the crank 102 completing a uniform circular motion of 360°, the hinge point A on the oscillating member 104 and the hinge point B on the driving member 202 both complete a round-trip motion. The time ratio of their return stroke to the forward stroke is K, and K = (180° + θ) / (180° - θ). Here, the K value is also the ratio of the average speed of the fast stroke to the average speed of the slow stroke. The K value is called the quick-return characteristic coefficient. The larger the quick-return characteristic coefficient K value, the more significant the quick-return characteristic of the mechanism; when K = 1, the mechanism has no quick-return characteristic. Attached Figure 5 and attached Figure 6 In the embodiment shown, by using computer-aided drawing methods, θ = 28.96° can be measured, and thus K = (180 + 28.96) / (180 - 28.96) = 1.38 can be calculated. When the rotational speed of the tattoo machine motor remains unchanged, by utilizing the quick-return characteristic, the fast stroke is used as the forward stroke of the tattoo machine, and the instantaneous speed at which the tattoo needle penetrates the skin is 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 requires a large power output from the tattoo machine motor. A high-power motor also increases the size and weight of the tattoo machine, and excessive speed changes will also increase the operating noise of the tattoo machine. For the present invention, it is a more appropriate choice for the K value to be between 1.2 and 2.0, such as 1.2, 1.4, 1.6, 1.8, or 2.0.

[0068] See Figure 7 , which is Figure 6 a schematic diagram of the position of the crank every 10° during the process of the crank rotating 360° in one week in Figure 7 . It is to divide the process of the crank 102 rotating 360° in one week into 36 equal parts, that is, to express the position of the crank 102 every 10° when it starts to rotate clockwise from the initial 0° position.

[0069] See Figure 8 , which is Figure 7 a schematic diagram of the position of the driving member moving corresponding to every 10° rotation during the process of the crank rotating 180° clockwise from the 0° position in Figure 8 Express attached Figure 7 the position of the driving member 202 corresponding to every 10° rotation during the process of the crank rotating 180° clockwise from the 0° position in Figure 8In the figure, arc AA4 and straight line BB4 are crossed once for every 10° rotation of the crank, and a total of 18 times. Each intersection point on BB4 is the corresponding position of point B on the driving member 202 as a slider for every 10° rotation of the crank. The distance between two adjacent intersection points is the displacement of the driving member 202 during the 10° rotation of the crank.

[0070] See also Fig. 9 , which is Figure 7 Schematic diagram of the position of the driving member moving when the middle crank rotates clockwise from the 180° position to the 360° position (0° position) every 10° rotation. Fig. 9 Expressed the attachment Figure 7 During the process of the middle crank rotating clockwise from the 180° position to the 360° position (0° position), each 10° rotation corresponds to the position of the driving member 202 moving. Fig. 9 In FIG. 1 , arc AA4 and straight line BB4 are crossed again 18 times.

[0071] See also Figure 10 to Figure 11 , Fig.10 for Figure 6 A graph of the displacement of the drive member versus time in the illustrated embodiment, Fig.11 for Figure 6 A graph of the speed of the drive member versus time in the illustrated embodiment, Fig.12 For the general Fig.10 and Fig.11 When the crank 102 rotates at a constant speed, the time taken for each rotation of 10° is the same. The time and angle are in direct proportion. Figure 6 To Attachment Fig. 9 It can be seen that in the time when the crank 102 rotates 360°, the time is divided into 36 equal parts. Correspondingly, the position of the driving member 202 at each time point and the displacement of each time period can be measured in the figure. The displacement value is divided by the time length to obtain the average speed of this time period. In this way, the crank 102 can be divided into more equal parts, such as 360 equal parts, and a corresponding position diagram is made for each rotation of 1°, so that more data can be obtained. Using these data, a curve of the relationship between the displacement of the driving member 202 and time can be drawn, as shown in the attached figure. Fig.10 Curve 1 in the figure; you can also plot the speed (average in the corresponding time period) versus time, and get the following Fig.11Curve 2 in the figure. This speed curve 2 reflects the approximate speed of the drive member 202 at the corresponding time point (the average speed of the corresponding time period). During the plotting and measurement process, the denser the angle divisions, the more accurate the speed of the drive member 202. These speed values ​​also reflect the speed of the tattoo needle during the process of advancing and retreating. As mentioned in the background technology, it is known that the motion conversion mechanism of the rotary motor tattoo machine in the prior art is usually a sine mechanism or an in-line slider-crank mechanism. The stroke displacement of the tattoo needle driven by their motion conversion mechanism is in a sinusoidal proportional relationship with the motor rotation angle. Therefore, in the attached Fig.10 The displacement versus time curve of the sinusoidal mechanism with the same stroke is also plotted for comparison; Fig.11 The speed-time curve 4 of the sine mechanism with the same stroke is also plotted for comparison. Fig.10 , Curve 2 or Curve 4 can also be understood as the curve of speed corresponding to angle and position. Assume that the tattoo machine stroke is 3.5mm and the penetration depth is 1.75mm. Fig.12 Is to attach Fig.10 The middle curve merges to the adjacent Fig.11 In contrast, Fig.12 From the curves 1 and 3, we can see that the movement law of curve 1 is better, and the tattoo needle stays in the skin for a shorter time. Fig.12 From the middle curves 2 and 4, it can be seen that the motion law of curve 2 is better, and the instantaneous speed of the tattoo needle piercing the skin is greater. It can be seen that the motion conversion mechanism provided by the present invention is significantly more advanced than the traditional rotary motor tattoo machine.

[0072] Those skilled in the art will appreciate that there are a variety of mechanical transmission mechanisms that can convert rotational motion into reciprocating swing. The first motion conversion mechanism 10 in the technical solution of the present invention adopts a swing guide rod mechanism, and the swing guide rod mechanism is a derived planar four-bar mechanism evolved from the planar four-bar mechanism. In the planar four-bar mechanism, the crank rocker mechanism can also convert rotational motion into reciprocating swing, and also has a quick return characteristic, which can be used as another choice 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 swing guide rod mechanism is always 90 degrees and its pressure angle is 0, it has good force transmission performance, so the swing guide rod mechanism is the preferred choice of the first motion conversion mechanism 10 in the technical solution of the present invention.

[0073] On the other hand, in the motion conversion mechanism of the tattoo device of the present invention, if a swing guide rod mechanism with a large quick-return characteristic coefficient K is used, the fast swing stroke is set to drive the driving member 202 to make a forward stroke, and the slow swing stroke is set to drive the driving member 202 to make a retracting stroke, so as to increase the instantaneous speed of the tattoo needle piercing the skin, this technical solution is significantly better than the motor tattoo machine with a sinusoidal motion law in the prior art. At this time, whether the speed increasing characteristic of the second motion conversion mechanism is obvious does not need to be too high, that is, there is no requirement for the speed configuration (setting) of the second conversion mechanism, and there is no need to specifically limit the average speed of the driving member 202 in the front and rear halves. For example, the attachment is selected Figure 4 The dotted line EE4 or CC4 as the motion trajectory of the driving component is also better than the current conventional motor tattoo machine. However, if the first motion conversion mechanism has a quick return feature and the second motion conversion mechanism has a significant speed increase feature, for example, the additional Figure 4 The dotted line BB4 or the dotted line FF4 in the figure is used as the motion trajectory of the driving component, and the motion characteristics of the tattoo machine are more significant. Due to the large speed fluctuation, the motor power requirement is also higher. The tattoo machine can be designed according to the tattoo artist's personal preference, and can emphasize the insertion speed or the shorter time the tattoo needle stays in the skin (the forward stroke speed increases significantly, the return stroke speed decreases significantly, and the average speed ratio of the front and back half is large). Alternatively, both of the above characteristics can be emphasized at the same time and a higher power motor can be used.

[0074] Fig.13 To adopt Figure 6 A schematic diagram of a tattoo device showing a motion conversion mechanism. Fig.13 In the embodiment, the tattoo device 500 includes a body 400 and a tattoo needle bundle 300 mounted on the body 400. The tattoo needle bundle 300 can be mounted on the body 400 in the form of a tattoo needle assembly (commonly known as an "integrated needle", which is a pre-assembled module of a tattoo needle bundle and a needle tip), or the tattoo needle bundle 300 and the tattoo needle tip 320 can be installed on the body 400 as independent parts. Figure 6 The motor 105 fixed on the frame 101 drives the crank 102 to rotate and thereby drives the swing 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 the hinge point A, thereby driving the driving member 202 to reciprocate linearly. The driving member 202 drives the tattoo needle bundle 300 to reciprocate linearly, or the driving member 202 and an elastic member (not shown) inside the tattoo needle assembly jointly drive the tattoo needle bundle 300 to complete the reciprocating linear motion.

[0075] In the technical solution of the present invention, the "slider" as a driving member is a member that can slide along the guide rail, and its actual physical shape is not necessarily a block shape. For example, the slider can be a rod-shaped member that slides in the guide rail groove; it can also be a sleeve-shaped member that slides on the guide rod, or a member that partially has a rod shape or a block shape. The "swing member" is a member that can swing, which can be limited to a rod-shaped swing rod, or it can be not limited to a rod-shaped member. The swing member can also be sleeve-shaped, or a member that partially has a rod shape or a sleeve shape. The crank 102 is driven by the motor 105 to rotate. The crank can be installed and connected to the motor rotor shaft; it can also be manufactured and set on the motor rotor in an integrated manner. The frame 101 can be a tattoo machine housing or frame. The drive rail 201 can be a slot or a hole or a rod shape. The drive rail 201 can be formed in the tattoo machine housing or frame, or it can be fixedly installed on the tattoo machine housing or frame.

[0076] Those skilled in the art will understand that the thickness of the skin varies from person to person, and the thickness of the skin of different parts of the same person is also different. There is no strict depth measurement for the depth of the tattoo needle piercing the skin. Tattoo artists may use tattoo machines with different strokes due to different operating techniques. For example, when tattooing, the needle tip moves against the skin, so the tattoo machine stroke can be relatively small, such as 3.0mm to 3.5mm, and half of the tattoo needle stroke is extended from the needle tip to pierce the skin while the other half is inside the needle tip. If the tattoo machine stroke is 4.2 mm, and the tattoo needle penetration depth is 1.75 mm or 1.5 mm, then the point where the tattoo needle pierces the skin is not necessarily the middle point of the stroke in the strict sense. The second half of the forward stroke can be understood as the position from the middle point of the stroke to the last point, or it can be understood as the stroke including piercing the skin.

[0077] It is understood that any range of values ​​herein is intended to specifically include any intervening values ​​or sub-ranges in the given range, and that all such intervening values ​​and sub-ranges are individually and specifically disclosed.

[0078] It is also understood that the words "a" and "an" mean "one or more" or "at least one", and any singular form is intended to include the plural herein. It is further understood that the term "including" includes any variation thereof and is intended to be open ended, meaning "including, but not limited to", unless otherwise expressly stated to the contrary. When a list of items with "or" before the last item is given herein, any one of the listed items or any appropriate combination of two or more of the listed items may be selected and used.

[0079] Of course, the embodiments of the present invention described above are intended to illustrate rather than limit the present invention. The form, arrangement of parts, details and sequence of operations of the described embodiments are susceptible to various modifications. It is the object of the present invention to include all such modifications within the scope of the claims as defined.

[0080] 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 operation of the tattoo artist. The use of the motion conversion mechanism for a tattoo device and the tattoo device of the present invention can realize the high-speed entry and high-speed exit of the tattoo needle in the skin (rapid insertion and rapid exit), and realize a shorter cycle time for the tattoo needle to stay in the skin; the rotary motor tattoo machine using such a motion conversion mechanism can make the speed of the tattoo needle faster at the moment of piercing the skin.

[0081] 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 protection scope of the appended claims of the present invention.

Claims

1. A motion conversion mechanism for a tattoo device, It is characterized in that include: A first conversion mechanism (10) for converting the rotational motion of the motor into reciprocating oscillation of the oscillating member (104), and a second conversion mechanism (20) for converting the reciprocating oscillation of the oscillating member (104) into reciprocating linear motion of the driving member (202); The second conversion mechanism (20) comprises a connecting rod (203), a driving member (202) for directly or indirectly driving the tattoo needle, and a driving guide rail (201) for limiting the driving member (202) to perform linear motion; the connecting rod (203) is connected to the swing member (104) of the first conversion mechanism in an articulated manner at a first hinge point (A), and the connecting rod (203) is connected to the driving member (202) in an articulated manner at a second hinge point (B); when the swing member (104) reciprocates, the first hinge point (A) performs reciprocating swings with a circular arc as a motion trajectory between two end points, and the second hinge point (B) is limited by the driving guide rail (201) to perform reciprocating linear motion with a straight line segment as a trajectory between two end points, and the connecting rod (203) drives the driving member (202) to perform linear reciprocating motion along the driving guide rail (201).

2. The motion conversion mechanism for a tattoo device according to claim 1, It is characterized in that The included angle between the direction of the linear motion trajectory of the driving member (202) restricted by the driving guide rail (201) and the line (AA4) connecting the two end points of the circular arc motion trajectory of the first hinge point (A) of the swing member (104) and the connecting rod (203) is greater than or equal to 30 degrees, thereby the second conversion mechanism (20) is configured such that, in the forward stroke of the driving member (202) driving the tattoo needle, the average speed of the driving member (202) in the second half is greater than the average speed in the first half; in the backward stroke of the driving member (202) driving the tattoo needle, the average speed of the driving member (202) in the first half is greater than the average speed in the second half, thereby achieving the tattoo needle to quickly advance and quickly withdraw from the skin after piercing the skin during the tattoo process, and to stay in the skin for a shorter time.

3. The motion conversion mechanism for a tattoo device according to claim 2, It is characterized in that The angle between the direction of the linear motion trajectory of the driving member (202) restricted by the driving guide rail (201) and the line (AA4) connecting the two end points of the circular arc motion trajectory of the first hinge point (A) of the swing member (104) and the connecting rod (203) is 45 to 80 degrees.

4. The motion conversion mechanism for a tattoo device according to claim 1 or 2, It is characterized in that The second conversion mechanism (20) is configured such that, in a forward stroke of the driving member (202) driving the tattoo needle, the average speed of the driving member (202) in the second half is more than 1.5 times the average speed of the driving member (202) in the first half; the second conversion mechanism (20) is configured such that, in a backward stroke of the driving member (202) driving the tattoo needle, the average speed of the driving member (202) in the first half is more than 1.5 times the average speed of the driving member (202) in the second half.

5. The motion conversion mechanism for a tattoo device according to claim 2, It is characterized in that An extension line of the linear motion trajectory of the second hinge point (B) where the connecting rod (203) is connected to the driving member (202) intersects with an arc segment (AA4) of the circular motion trajectory of the first hinge point (A) of the connecting rod (203).

6. The motion conversion mechanism for a tattoo device according to claim 2, It is characterized in that When the driving member (202) drives the tattoo needle to move forward and enters a certain position in the second half of the forward stroke, the extension line of the line connecting the first hinge point (A) and the second hinge point (B) of the connecting rod (203) coincides with the extension line of the linear motion trajectory of the second hinge point (B).

7. The motion conversion mechanism for a tattoo device according to claim 1, It is characterized in that The reciprocating linear motion stroke of the driving member (202) is 2 to 5 mm.

8. The motion conversion mechanism for a tattoo device according to claim 1, It is characterized in that The first conversion mechanism is configured to have a quick return characteristic. When the motor rotates at a constant speed, the swing member (104) performs a reciprocating swing with the quick return characteristic. During the swinging process of the swing member (104) with the quick return characteristic, a fast swing stroke is configured to drive the driving member (202) to perform a forward stroke, and a slow swing stroke is configured to drive the driving member (202) to perform a backward stroke, thereby achieving a faster speed at which the tattoo needle instantly penetrates the skin during the forward stroke without increasing the motor speed.

9. The motion conversion mechanism for a tattoo device according to claim 8, It is characterized in that The first conversion mechanism (10) comprises a swing guide rod mechanism, which comprises a frame (101), a crank (102), a slider (103), and the swing component (104). The crank (102) is connected to the motor to perform rotational motion. The crank (102) drives the slider (103) to move along the swing component (104). The swing component (104) performs fixed-axis swing. When the motor rotates at a constant speed, the swing component (104) performs reciprocating swing with a quick return characteristic.

10. The motion conversion mechanism for a tattoo device according to claim 8, It is characterized in that The ratio of the average speed of the forward stroke of the tattoo needle driven by the driving member (202) to the average speed of the backward stroke is 1.2-2.

0.

11. The motion conversion mechanism for a tattoo device according to claim 2, It is characterized in that The first conversion mechanism is configured to have a quick-return characteristic. When the motor rotates at a constant speed, the swing member (104) performs a reciprocating swing with the quick-return characteristic. During the swinging of the swing member (104) with the quick-return characteristic, a fast swinging stroke is configured to drive the driving member (202) to perform a forward stroke, and a slow swinging stroke is configured to drive the driving member (202) to perform a backward stroke.

12. The motion conversion mechanism for a tattoo device according to claim 2, It is characterized in that The first conversion mechanism (10) comprises a swing guide rod mechanism, which comprises a frame (101), a crank (102), a slider (103), and the swing component (104). The crank (102) is connected to the motor to perform rotational motion. The crank (102) drives the slider (103) to move along the swing component (104). The swing component (104) performs fixed-axis swing. When the motor rotates at a constant speed, the swing component (104) performs reciprocating swing with a quick return characteristic.

13. A tattoo device, It is characterized in that The invention comprises a motion conversion mechanism for a tattoo device as claimed in any one of claims 1 to 12.

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