CN114434955A

CN114434955A - Rotating disc type double-head pad printing machine

Info

Publication number: CN114434955A
Application number: CN202210052666.6A
Authority: CN
Inventors: 李小艳
Original assignee: Shenzhen Jiuhe Precision Automation Equipment Co ltd
Current assignee: Shenzhen Jiuhe Precision Automation Equipment Co ltd
Priority date: 2022-01-18
Filing date: 2022-01-18
Publication date: 2022-05-06

Abstract

The invention discloses a rotating disc type double-head pad printing machine, which comprises a base, wherein the upper surface of the base is fixedly connected with a fixed disc through a support, the upper surface of the base is rotatably connected with an upright post through a bearing, the upper surface of the upright post is fixedly connected with a rotating disc, the upper surface of the rotating disc is provided with two pigment grooves and an object placing groove, and the base and the rotating disc are provided with a pad printing mechanism; move printing mechanism includes servo motor, servo motor passes through support fixed connection with the base upper surface, servo motor's output shaft fixedly connected with axis of rotation, axis of rotation interference fit has first gear, stand interference fit has the second gear, second gear and first gear engagement. Has the advantages that: the pad printing machine can simultaneously pad print two patterns or characters, avoids the complex operation in the prior art, can automatically wipe the rubber head, can automatically coat the pigment, and greatly improves the processing efficiency.

Description

Rotating disc type double-head pad printing machine

Technical Field

The invention relates to the technical field of pad printing machines, in particular to a rotary disc type double-head pad printing machine.

Background

In our lives, printing equipment is widely available, when people want to display text information or picture information on paper or other materials, the printing equipment is needed to be used for printing the text information or the picture information on an article needing displaying, and a pad printing machine is one of a plurality of printing equipment and is suitable for plastics, toys, glass, metal, ceramics, electronics, IC seals and the like. Pad printing is an indirect gravure printing technique, and has become a main method for printing and decorating the surfaces of various objects.

In the prior art, the existing pad printing machine is often provided with only one rubber head for pad printing, or two rubber heads for pad printing of the same pattern or character information, and when two different patterns and character information are required to be pad printed, operation needs to be performed twice, the operation process is complicated, and in the existing pad printing machine, after one-time pad printing is completed, processing personnel needs to manually coat the pigment on the template, so that the pigment is uniformly coated on the template, the labor intensity is high, the efficiency is low, some pad printing machines which automatically coat through computer control exist, but computer control is easy to break down, and the reliability is low.

Disclosure of Invention

The invention aims to solve the problems of complex operation, general reliability and the like in the prior art, and provides a rotary disc type double-head pad printing machine.

In order to achieve the purpose, the invention adopts the following technical scheme:

a turntable type double-head pad printing machine comprises a base, wherein a fixed disc is fixedly connected to the upper surface of the base through a support, an upright post is rotatably connected to the upper surface of the base through a bearing, a turntable is fixedly connected to the upper surface of the upright post, two pigment grooves and an object placing groove are formed in the upper surface of the turntable, and pad printing mechanisms are arranged on the base and the turntable;

the pad printing mechanism comprises a servo motor which is fixedly connected with the upper surface of the base through a bracket, the output shaft of the servo motor is fixedly connected with a rotating shaft, the rotating shaft is in interference fit with a first gear, the upright post is in interference fit with a second gear which is meshed with the first gear, the turntable is in penetrating rotation connection with two sliding sleeves through a bearing, the sliding sleeve is sleeved with a sliding column in a sliding manner, the lower surface of the sliding column is fixedly connected with a rubber head, the upper surface of the turntable is fixedly connected with two horseshoe-shaped electromagnets through a bracket, the horseshoe-shaped electromagnet is electrically connected with the servo motor through a lead, the inner side wall of the sliding sleeve is provided with a plurality of sliding grooves, the sliding groove is internally and slidably connected with a sliding block, the sliding block is fixedly connected with the corresponding side wall of the sliding column, and an extension spring is fixedly connected between the sliding block and the corresponding bottom wall of the sliding groove.

Further, the mechanism is still including seting up the cavity in the base to the bat printing, the axis of rotation runs through with the base through the bearing and rotates to be connected and extend to in the cavity, the axis of rotation is located two first conducting rods of one section fixedly connected with in the cavity, the equal fixedly connected with permanent magnet of two inside walls that the cavity is relative, the first torsion spring of fixedly connected with between sliding sleeve and the carousel, two equal fixedly connected with second conducting rods in sliding sleeve upper surface, the second conducting rod with correspond first conducting rod passes through the wire electricity and connects, fixed disk upper surface fixedly connected with wipes the piece for two.

Furthermore, a template is embedded in the bottom wall in the pigment groove, and the number of teeth of the first gear is one fourth of the number of teeth of the second gear.

Further, the slider is made for the ferromagnetism material, the sliding sleeve is made for the aluminum alloy material.

Further, the fixed disk is annular, and the stand runs through the fixed disk.

Further, be provided with the coating mechanism who is used for scribbling and establishes pigment in the fixed disk, coating mechanism includes two coating pieces, the coating piece is all seted up flutedly, coating piece sliding connection is in corresponding the pigment inslot, fixed surface is connected with two paintboxes on the fixed disk, the cross-section of paintbox is the concave font with opening up, the coating piece with correspond the paintbox runs through fixedly connected with bellows jointly, the bellows will the inside and inside intercommunication of paintbox of coating piece, the lateral wall fixedly connected with rack that the coating piece is close to stand one side.

Further, coating mechanism is still including seting up the ring channel at the fixed disk inside wall, the diapire rotates through the bearing and is connected with two dwangs in the ring channel, dwang interference fit has third gear, fourth gear, the rack runs through sliding connection with the fixed disk and extends to in the ring channel, the rack is located one section in the ring channel and corresponds third gear engagement, fixedly connected with second torsion spring between diapire in fourth gear and the ring channel, stand interference fit has incomplete gear, incomplete gear and fourth gear engagement.

Furthermore, two inside walls that the pigment groove is relative have all been seted up the spacing groove, sliding connection has the stopper in the spacing groove, the stopper with correspond coating piece lateral wall fixed connection.

The invention has the following advantages:

1. through the arrangement of the two rubber heads, the rubber heads rotate around the axis of the upright post through the rotation of the rotary table, and through the arrangement of the teeth number of the first gear and the second gear, the servo motor drives the rotary table to rotate 90 degrees at each time, so that the two rubber heads can continuously absorb patterns of different templates in the rotating process and then transfer-print the patterns to an object in the object accommodating groove, and the two rubber heads continuously and repeatedly absorb different patterns for transfer printing, so that the transfer printing machine can simultaneously transfer-print two patterns, and the transfer printing operation in two batches in the prior art is avoided, thereby enabling the operation process to be simpler and more convenient;

2. after the pad printing is completed for one time, the sliding sleeve is rotated in a reciprocating manner through the rotation of the rotating shaft, so that the rubber head is driven to rotate in a reciprocating manner, the rubber head is continuously rubbed with the wiping block in the moving process, and the pigment on the rubber head is wiped off through the wiping block, so that the influence on the next pad printing pattern or character is avoided;

3. after the pad printing is finished once, the rubber head can be automatically wiped, so that manual wiping is avoided, the labor intensity is greatly reduced, and the processing efficiency is improved;

4. when the upright column rotates to drive the turntable to rotate, the coating block reciprocates through the arrangement of the incomplete gear, the third gear, the fourth gear and the rack, and the pigment in the pigment box is automatically coated on the template, so that manual coating is avoided, the labor intensity is greatly reduced, and the efficiency is improved;

5. the coating mechanism for coating the pigment and the upright post are driven by a mechanical structure, and compared with the prior art which is controlled by a computer, the coating mechanism for coating the pigment has lower failure rate and higher reliability.

Drawings

FIG. 1 is a schematic structural view of a rotary disk type double-head pad printing machine according to the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

FIG. 3 is an enlarged view of FIG. 1 at B;

FIG. 4 is a cross-sectional view taken at C-C of FIG. 1;

FIG. 5 is an enlarged view at F in FIG. 4;

FIG. 6 is a partial cross-sectional view taken at D-D of FIG. 1;

fig. 7 is a cross-sectional view taken at E-E in fig. 1.

In the figure: the color painting device comprises a base 1, a fixed disc 2, a rotary disc 3, a servo motor 4, a rotating shaft 5, a first gear 6, a second gear 7, a pigment groove 8, a template 9, a sliding sleeve 10, a sliding column 11, a glue head 12, a first torsion spring 13, a sliding groove 14, a sliding block 15, a tension spring 16, a horseshoe-shaped electromagnet 17, a cavity 18, a permanent magnet 19, a first conductive rod 20, a second conductive rod 21, a vertical column 22, an annular groove 23, an incomplete gear 24, a coating block 25, a paint box 26, a corrugated tube 27, a rack 28, a rotating rod 29, a third gear 30, a fourth gear 31, a second torsion spring 32, a limiting groove 33, a limiting block 34, a storage groove 35 and a wiping block 36.

Detailed Description

Referring to fig. 1-7, a rotary disc type double-head pad printing machine comprises a base 1, wherein the upper surface of the base 1 is fixedly connected with a fixed disc 2 through a support, the upper surface of the base 1 is rotatably connected with an upright post 22 through a bearing, the upper surface of the upright post 22 is fixedly connected with a rotary disc 3, the upper surface of the rotary disc 3 is provided with two pigment grooves 8 and two object placing grooves 35, as shown in fig. 7, the two pigment grooves 8 are symmetrically arranged, the two object placing grooves 35 are symmetrically arranged, the angle between each pigment groove 8 and the corresponding object placing groove 35 is 90 degrees, and a pad printing mechanism is arranged on the base 1 and the rotary disc 3;

the reprinting mechanism comprises a servo motor 4, the rotation angle of the servo motor 4 can be accurately controlled, and for the prior art, details are not described herein, the servo motor 4 is fixedly connected with the upper surface of the base 1 through a bracket, an output shaft of the servo motor 4 is fixedly connected with a rotation shaft 5, the rotation shaft 5 is in interference fit with a first gear 6, an upright post 22 is in interference fit with a second gear 7, the second gear 7 is meshed with the first gear 6, the turntable 3 is in through rotation connection with two sliding sleeves 10 through a bearing, the sliding sleeves 10 are slidably sleeved with sliding columns 11, the lower surfaces of the sliding columns 11 are fixedly connected with rubber heads 12, the upper surface of the turntable 3 is fixedly connected with two shoe-shaped electromagnets 17 through a bracket, the shoe-shaped electromagnets 17 are electrically connected with the servo motor 4 through wires, and the wires are connected, so that the shoe-shaped electromagnets 17 are simultaneously electrified to generate magnetic attraction force on the sliding blocks 15 when the servo motor 4 is electrified to rotate, the inner side wall of the sliding sleeve 10 is provided with a plurality of sliding grooves 14, a sliding block 15 is connected in the sliding grooves 14 in a sliding manner, the sliding column 11 is limited to a certain extent through the arrangement of the sliding grooves 14 and the sliding block 15, so that the sliding sleeve 10 is prevented from sliding out of the sliding sleeve 10, the stability of the operation of the pad printing machine is ensured, meanwhile, through the arrangement of the sliding grooves 14 and the sliding block 15, the sliding sleeve 10 can drive the sliding column 11 to rotate together in the rotating process, the sliding block 15 is fixedly connected with the corresponding side wall of the sliding column 11, an extension spring 16 is fixedly connected between the sliding block 15 and the corresponding bottom wall in the sliding groove 14, pulse current is introduced to the servo motor, so that the servo motor 4 rotates intermittently, and the servo motor 4 rotates for one circle each time, the servo motor 4 rotates for one circle, and the rotary disc 3 is driven to rotate for 90 degrees through the meshing of the first gear 6 and the second gear 7, so that the rubber head 12 rotates to the upper side of the pigment groove 8, at the moment, the servo motor 4 and the horseshoe-shaped electromagnet 17 are powered off, the rubber head 12 moves downwards under the elastic force of the extension spring 16 and contacts with the template 9 to take the pattern, then the servo motor 4 starts to rotate again, so that the rubber head 12 rotates 90 degrees again and rotates to the upper part of the object placing groove 35, at the moment, the hoof-shaped electromagnet 17 is powered off again, so that the rubber head 12 slides downwards to perform pad printing, after the pad printing is completed, the upright post 22 rotates 90 degrees again, so that the rubber head 12 rotates to be above the other template 9, and when the rubber head rotates next time, the pattern or the character of the other template is pad-printed, so that the pad printing machine can simultaneously pad-print two patterns or characters, and the complex operation that two times of operation is needed if the pad printing machine in the prior art needs to pad-print two patterns is avoided, thereby greatly simplifying the operation steps and greatly improving the processing efficiency of pad printing of two patterns;

it should be noted that two identical templates 9 can be placed in the two color tanks 8, and the pad printing machine of the present invention can perform pad printing of the same pattern and character, so that the present invention can be applied to pad printing of two patterns, and can also perform pad printing of the same pattern or character as a common pad printing machine, thereby widening the application range of pad printing in the present invention.

The transfer printing mechanism further comprises a cavity 18 arranged in the base 1, the rotating shaft 5 is connected with the base 1 in a penetrating and rotating mode through a bearing and extends into the cavity 18, one section of the rotating shaft 5, which is positioned in the cavity 18, is fixedly connected with two first conductive rods 20, two inner side walls opposite to the cavity 18 are fixedly connected with permanent magnets 19, a magnetic induction line between the two permanent magnets 19 points to the other permanent magnet 19 from one permanent magnet 19, so that the first conductive rods 20 can cut the magnetic induction line generated by the two permanent magnets 19 in the rotating process, a first torsion spring 13 is fixedly connected between the sliding sleeve 10 and the rotating disc 3, two second conductive rods 21 are fixedly connected to the upper surfaces of the two sliding sleeves 10, the second conductive rods 21 are electrically connected with the corresponding first conductive rods 20 through conducting wires, namely the second conductive rod 21 positioned on the left side is connected with the first conductive rod 20 on the left side, and similarly, the second conductive rod 21 on the right side is connected with the first conductive rod 20 on the right side, so that when the servo motor 4 drives the rotating shaft 5 to rotate, the two first conductive rods 20 are driven to rotate to cut the magnetic induction lines of the permanent magnets 19 to generate induction current, so that current is introduced into the second conductive rods 21, the second conductive rods 21 are introduced with current, and the magnetic induction lines between the two magnetic poles of the horseshoe-shaped electromagnet 17 (the magnetic induction lines between the two magnetic poles of the horseshoe-shaped electromagnet 17 point to the other magnetic pole from one magnetic pole) rotate until the two second conductive rods 21 rotate out of the horseshoe-shaped electromagnet 17, the sliding sleeve 10 is reset under the elastic force of the first torsion spring 13, so that the sliding sleeve 10 drives the rubber head 12 to rotate in a reciprocating manner through the sliding column 11, and the rubber head 12 moves to the position above the wiping block 36, rotates around the upright column 22 through the rubber head 12 and moves in a reciprocating manner, and the pigment on the surface of the rubber head 12 is wiped through the arrangement of the wiping block 36, thereby avoiding the subsequent transfer printing influenced by the pigment, two wiping blocks 36 are fixedly connected to the upper surface of the fixed tray 2, and as shown in fig. 7, the two wiping blocks 36 are arc-shaped and symmetrical about the center of the fixed tray 2.

The bottom wall inlays in pigment groove 8 and is equipped with template 9, template 9 can be dismantled, thereby be convenient for change, the number of teeth of first gear 6 is the fourth of 7 numbers of teeth of second gear, setting through first gear 6 and second gear 7, make first gear 6 under servo motor 4's drive, first gear 6 rotates the round, can drive second gear 7 and rotate 90, thereby make stand 22 drive carousel 3 rotate 90, and then make two gluey heads 12 remove to next region, carry out different operations.

Slider 15 is made for the ferromagnetism material, and sliding sleeve 10 makes for the aluminum alloy material, and slider 15 can drive the motion of slip post 11 under the magnetic force of hoof shape electro-magnet 17, and the sliding sleeve 10 of aluminum alloy material does not have magnetism to guarantee that the magnetic force of hoof shape electro-magnet 17 can be better act on slider 15, avoid if sliding sleeve 10 all has magnetism, produce certain shielding to magnetic force, influence the magnetic force of hoof shape electro-magnet 17 to slider 15.

The fixed plate 2 is annular, and the upright post 22 penetrates through the fixed plate 2.

The fixed disk 2 is internally provided with a coating mechanism for coating pigment, the coating mechanism comprises two coating blocks 25, the coating blocks 25 are provided with grooves, as shown in fig. 3, the upper parts of the grooves of the coating blocks 25 are larger, the lower parts of the grooves of the coating blocks 25 are smaller, so that the pigment slowly flows out, meanwhile, the lower surface of the coating blocks 25 is provided with two scrapers, so that the two scrapers form a space, the pigment flows between the two scrapers after flowing out of the coating blocks 25, so that the pigment uniformly scrapes on the template 9 through the scrapers when the coating blocks 25 move, the coating blocks 25 are slidably connected in the corresponding pigment grooves 8, the upper surface of the fixed disk 2 is fixedly connected with two pigment boxes 26, the cross sections of the pigment boxes 26 are in a concave shape with upward openings, the coating blocks 25 and the corresponding pigment boxes 26 jointly penetrate through the corrugated pipes 27, and the length of the corrugated pipes 27 can be changed by themselves, therefore, during the moving process of the coating block 25, the corrugated pipe 27 can constantly keep the coating block 25 communicated with the pigment box 26, the corrugated pipe 27 communicates the interior of the coating block 25 with the interior of the pigment box 26, and the side wall of the coating block 25 close to one side of the upright post 22 is fixedly connected with the rack 28.

The coating mechanism further comprises an annular groove 23 formed in the inner side wall of the fixed disk 2, the bottom wall of the annular groove 23 is rotatably connected with two rotating rods 29 through bearings, the rotating rods 29 are in interference fit with third gears 30 and fourth gears 31, a rack 28 and the fixed disk 2 are in penetrating sliding connection and extend into the annular groove 23, one section of the rack 28 located in the annular groove 23 is meshed with the corresponding third gear 30, a second torsion spring 32 is fixedly connected between the fourth gear 31 and the bottom wall of the annular groove 23, an incomplete gear 24 is in interference fit with the upright column 22, the incomplete gear 24 is meshed with the fourth gear 31, as shown in fig. 4, the incomplete gear 24 is far larger than the fourth gear 31 in size, and the incomplete gear 24 is a quarter of a whole gear, so that when the incomplete gear 24 rotates 180 degrees, one side of the fourth gear 31 can be driven to rotate to complete one-time pigment coating, and the size is set so that the rotation of the incomplete gear 24 can drive the fourth gear 31 to rotate for more turns, so that the fourth gear 31 drives the third gear 30 to rotate for enough turns through the rotating rod 29, and the driving of the rack 28 by the third gear 30 for enough turns can sufficiently enable the coating block 25 to completely sweep the template 9, thereby avoiding the occurrence of uneven coating.

Spacing groove 33 has all been seted up to two inside walls that pigment groove 8 is relative, sliding connection has stopper 34 in spacing groove 33, stopper 34 and the 25 lateral wall fixed connection of coating piece that correspond, setting through spacing groove 33 and stopper 34, carry out certain spacing to the motion of coating piece 25 in pigment groove 8, thereby make coating piece 25 only can move along pigment groove 8's extending direction, thereby avoid coating piece 25 roll-off pigment groove 8, and simultaneously, spacing groove 33 and stopper 34's setting, can guarantee that the interval between coating piece 25 and the template 9 keeps unchangeable, thereby make the pigment coating more even on template 9.

In the invention, the article to be pad-printed is placed in the article placing groove 35, the servo motor 4 is started at the same time, pulse current is introduced into the servo motor 4, thereby causing the servo motor 4 to intermittently rotate, and intermittently rotate for one circle each time, thereby causing the servo motor 4 to drive the rotating shaft 5 to rotate for one circle, the rotating shaft 5 to drive the first gear 6 which is in interference fit with the rotating shaft to rotate for one circle, through the arrangement of the number of teeth, the first gear 6 drives the second gear 7 to rotate 90 degrees, so that the second gear 7 drives the upright post 22 to rotate 90 degrees, then the rotating disc 3 rotates 90 degrees, the two rubber heads 12 rotate to the upper part of the pigment groove 8, the servo motor 4 and the shoe-shaped electromagnet 17 are powered off, the sliding block 15 slides downwards under the elastic force of the extension spring 16 to drive the sliding column 11 to slide downwards, so that the sliding column 11 drives the rubber head 12 to extend downwards into the pigment groove 8, and the pattern of the template 9 is shot;

after the shooting is finished, the servo motor 4 rotates again, meanwhile, the shoe-shaped electromagnet 17 is electrified to generate magnetic attraction force on the sliding block 15, so that the sliding block 15 drives the sliding column 11 to slide upwards, the sliding column 11 drives the rubber head 12 to slide out of the pigment groove 8, meanwhile, the servo motor 4 drives the upright post 22 to rotate, the rotary disc 3 rotates, the rubber head 12 rotates to the position above the object placing groove 35, at the moment, the shoe-shaped electromagnet 17 and the servo motor 4 are powered off again, under the elastic force of the tension spring 16, the sliding block 15 slides downwards to drive the sliding column 11 to slide downwards, so that the sliding column 11 drives the rubber head 12 to be close to and in contact with the object in the object placing groove 35 for pad printing, after the pad printing is finished, the servo motor 4 is electrified again, the rubber head 12 slides upwards and rotates simultaneously, and at the moment, the rubber head 12 rotates to the position above the wiping block 36;

meanwhile, the rotation of the rotating shaft 5 drives the two first conductive rods 20 to rotate, the magnetic induction lines of the permanent magnets 19 are cut, induction currents are generated, so that the currents are introduced into the second conductive rods 21, the second conductive rods 21 can rotate under the magnetic induction lines of the horseshoe-shaped electromagnets 17 when the currents are introduced, until the two second conductive rods 21 rotate out of the horseshoe-shaped electromagnets 17, the sliding sleeve 10 is reset under the elastic force of the first torsion spring 13, so that the sliding sleeve 10 drives the rubber head 12 to rotate in a reciprocating mode through the sliding column 11, the rubber head 12 moves to the position above the wiping block 36, the rubber head 12 rotates around the vertical column 22 through the rubber head 12 and does reciprocating motion, and meanwhile, the pigment on the surface of the rubber head 12 is wiped through the arrangement of the wiping block 36, so that the subsequent transfer printing is prevented from being influenced;

the servo motor 4 rotates again to drive the upright post 22 to rotate, the upright post 22 rotates 90 degrees again to enable the rubber head 12 to rotate to the upper part of the other template 9, and when the rubber head rotates next time, the pattern or the character of the other template is pad printed, so that the pad printing machine can simultaneously perform pad printing of two patterns or characters;

when the upright column 22 rotates, the incomplete gear 24 in interference fit with the upright column is driven to rotate, the incomplete gear 24 drives the fourth gear 31 engaged with the incomplete gear to rotate, so that the fourth gear 31 drives the rotating rod 29 in interference fit with the fourth gear to rotate, the rotating rod 29 drives the third gear 30 in interference fit with the third gear to rotate, the third gear 30 drives the rack 28 engaged with the third gear to move, so that the rack 28 drives the coating block 25 to move, meanwhile, the pigment in the pigment box 26 flows into the coating block 25 through the corrugated pipe 27 under the action of self gravity, then flows to a position between two scraping plates below the coating block 25, and then along with the movement of the coating block 25, the pigment is uniformly coated on the surface of the template 9, and when the incomplete gear 24 is not engaged with the fourth gear 31, under the elastic force of the second torsion spring 32, the rotating rod 29 drives the third gear 30 to reset, so that the third gear 30 is engaged with the rack 28, the coating block 25 is reset, and thus the coating of the pigment is completed.

Claims

1. The turntable type double-head pad printing machine comprises a base (1) and is characterized in that a fixed disc (2) is fixedly connected to the upper surface of the base (1) through a support, an upright post (22) is rotatably connected to the upper surface of the base (1) through a bearing, a turntable (3) is fixedly connected to the upper surface of the upright post (22), two pigment grooves (8) and an object containing groove (35) are formed in the upper surface of the turntable (3), and pad printing mechanisms are arranged on the base (1) and the turntable (3);

the transfer printing mechanism comprises a servo motor (4), the servo motor (4) is fixedly connected with the upper surface of a base (1) through a support, an output shaft of the servo motor (4) is fixedly connected with a rotating shaft (5), the rotating shaft (5) is in interference fit with a first gear (6), an upright post (22) is in interference fit with a second gear (7), the second gear (7) is meshed with the first gear (6), a turntable (3) is connected with two sliding sleeves (10) in a penetrating and rotating mode through a bearing, the sliding sleeves (10) are sleeved with sliding columns (11) in a sliding mode, the lower surfaces of the sliding columns (11) are fixedly connected with rubber heads (12), the upper surface of the turntable (3) is fixedly connected with two horseshoe-shaped electromagnets (17) through the support, the horseshoe-shaped electromagnets (17) are electrically connected with the servo motor (4) through a lead, and a plurality of sliding grooves (14) are formed in the inner side wall of the sliding sleeves (10), the sliding column is characterized in that a sliding block (15) is connected in the sliding groove (14) in a sliding mode, the sliding block (15) is fixedly connected with the side wall of the corresponding sliding column (11), and an extension spring (16) is fixedly connected between the sliding block (15) and the inner bottom wall of the corresponding sliding groove (14).

2. The pad printing machine according to claim 1, wherein the pad printing mechanism further comprises a cavity (18) provided in the base (1), the rotating shaft (5) is connected with the base (1) in a penetrating and rotating way through a bearing and extends into the cavity (18), a section of the rotating shaft (5) positioned in the cavity (18) is fixedly connected with two first conductive rods (20), two opposite inner side walls of the cavity (18) are fixedly connected with permanent magnets (19), a first torsion spring (13) is fixedly connected between the sliding sleeves (10) and the rotary table (3), two second conductive rods (21) are fixedly connected on the upper surfaces of the two sliding sleeves (10), the second conductive rods (21) are electrically connected with the corresponding first conductive rods (20) through conducting wires, the upper surface of the fixed disc (2) is fixedly connected with two wiping blocks (36).

3. The pad printing machine according to claim 1, wherein a stencil (9) is embedded in the bottom wall of the color tank (8), and the number of teeth of the first gear (6) is one fourth of the number of teeth of the second gear (7).

4. The pad printing machine according to claim 1, wherein the slider (15) is made of ferromagnetic material and the sliding sleeve (10) is made of aluminum alloy.

5. The pad printing machine according to claim 1, wherein the holding pan (2) is annular, the upright (22) penetrating the holding pan (2).

6. The turntable type double-head pad printing machine according to claim 1, wherein a coating mechanism for coating pigments is arranged in the fixed disk (2), the coating mechanism comprises two coating blocks (25), each coating block (25) is provided with a groove, the coating blocks (25) are slidably connected in the corresponding pigment grooves (8), two pigment boxes (26) are fixedly connected to the upper surface of the fixed disk (2), the cross sections of the pigment boxes (26) are in a concave shape with upward openings, the coating blocks (25) and the corresponding pigment boxes (26) jointly penetrate through a corrugated pipe (27) in a fixedly connected mode, the corrugated pipe (27) enables the interiors of the coating blocks (25) to be communicated with the interiors of the pigment boxes (26), and a rack (28) is fixedly connected to the side wall of the coating block (25) close to one side of the upright column (22).

7. The pad printing machine according to claim 6, wherein said coating means further comprise an annular groove (23) made in the inner side wall of the fixed plate (2), the inner bottom wall of the annular groove (23) is rotationally connected with two rotating rods (29) through bearings, the rotating rod (29) is in interference fit with a third gear (30) and a fourth gear (31), the rack (28) is connected with the fixed disc (2) in a penetrating and sliding way and extends into the annular groove (23), the section of the rack (28) positioned in the annular groove (23) is meshed with the corresponding third gear (30), a second torsion spring (32) is fixedly connected between the fourth gear (31) and the inner bottom wall of the annular groove (23), the upright post (22) is in interference fit with an incomplete gear (24), and the incomplete gear (24) is meshed with a fourth gear (31).

8. The pad printing machine of claim 6, wherein two opposite inner side walls of the pigment groove (8) are provided with limiting grooves (33), a limiting block (34) is slidably connected in each limiting groove (33), and each limiting block (34) is fixedly connected with the corresponding side wall of the coating block (25).