CN109808294B - Multi-color flat screen plate curved surface printing machine - Google Patents
Multi-color flat screen plate curved surface printing machine Download PDFInfo
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- CN109808294B CN109808294B CN201910215808.4A CN201910215808A CN109808294B CN 109808294 B CN109808294 B CN 109808294B CN 201910215808 A CN201910215808 A CN 201910215808A CN 109808294 B CN109808294 B CN 109808294B
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- 238000003854 Surface Print Methods 0.000 title claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims abstract description 145
- 230000005540 biological transmission Effects 0.000 claims abstract description 141
- 238000007639 printing Methods 0.000 claims abstract description 111
- 230000001360 synchronised effect Effects 0.000 claims abstract description 53
- 238000007650 screen-printing Methods 0.000 claims abstract description 21
- 230000000712 assembly Effects 0.000 claims abstract description 8
- 238000000429 assembly Methods 0.000 claims abstract description 8
- 238000013519 translation Methods 0.000 claims abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 238000007790 scraping Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 6
- 238000013459 approach Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 11
- 238000010021 flat screen printing Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000004049 embossing Methods 0.000 description 2
- 238000007641 inkjet printing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 238000007649 pad printing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Screen Printers (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
Abstract
The invention relates to a multi-color flat screen plate curved surface printing machine, which is characterized in that: the printing machine comprises a printing station with flat screen plates, curved surface platen assemblies for supporting printing objects, and platen track driving mechanisms which are connected with the curved surface platen assemblies and drive the curved surface platen assemblies to circularly translate according to closed tracks, wherein the platen track driving mechanisms are used for driving the synchronous translation screen plates of the flat screen plates to follow-up driving mechanisms; the die roller rotating driving mechanism is used for driving the curved platen assemblies positioned at all printing stations to synchronously rotate, is provided with a clutch driving assembly used for driving the die roller rotating driving mechanism to be far away from or close to a rotating shaft to realize torque transmission or disengagement, and further comprises a die roller angle locking mechanism. The invention has the advantages that: the rotary shaft can be rotated in a centralized synchronous driving mode, the problem of moving interference of a rotary shaft driving mechanism is avoided, and multi-color high-precision printing on an elliptical screen printing machine is further smoothly realized.
Description
Technical Field
The invention relates to a multicolor printing machine, in particular to a multi-color flat screen plate curved surface printing machine.
Background
Curved surface printing refers to a printing mode of printing a curved-surface printing stock, curved-surface color printing is classified into a traditional method and a modern method according to different development stages of curved surface printing, the traditional method is classified into a curved-surface screen printing, pad printing, a molded article relief offset printing and the like according to different curved-surface ink transfer modes, and the modern method is classified into a 3D color printing method, a rotary body surface ink-jet printing method and a three-dimensional ink-jet printing method according to different spatial movement modes of the printing stock.
In the technical aspect of curved surface silk screen equipment, because the silk screen equipment is low in price, the use history is longer, the related matching is mature, and compared with other curved surface printing modes, the silk screen equipment has certain competitiveness and market prospect. The principle is as follows:
the printing stock is fixed on the die roller and rotates together with the die roller, the translatable silk screen is positioned above the printing stock, the rotation quantity of the die roller and the printing stock on the die roller is the same as the movement quantity of the silk screen printing plate, and the printing is performed by the pressurizing movement of the scraper right above the rotation axis of the die roller and the printing stock.
Curved flat screen printing machines manufactured by the principles described above have been known for many years, for example in patent application number
201010283761, the printing machine manufactured by the structure is single-color printing, multi-color printing cannot be performed, and the market application range is narrow. The failure to successfully develop the multi-color flat screen printing machine mainly has the following technical problems:
(1) Consistency of reference positions of the die cylinder through different color registering stations:
in the traditional single-color curved surface printing, the problem of repeated positioning is avoided, and the complete printing of the pattern on a printing stock is only required;
as is well known, in multi-color printing, a mold roll for supporting a printing material is not only required to rotate to realize curved surface printing, but also required to be capable of translating a screen sequentially passing through a plurality of screen printing stations on the same plane according to a circular or elliptical track to perform color matching, if the current printing material and the mold roll are moved to the lower part of each screen to perform printing, the reference position change of the printing material on the mold roll and the screen on each corresponding station exceeds the required error range, the problem of inaccurate color matching is caused, defective products are directly caused, and the method can only be applied to products with very low printing requirements.
(2) In the multi-color printing machine, the number of the die rollers is large, and each die roller needs a rotary driving mechanism to drive the die roller and a printing stock on the die roller to rotate; if one or a small number of motors are used for jointly driving the die rollers through a transmission belt and a transmission shaft, the die rollers and the rotary driving mechanism need to be considered to integrally translate along a circular or elliptical track, and cannot interfere with other mechanical parts, so that the method is obviously unreasonable.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the multi-color flat screen plate curved surface printing machine which is low in cost, high in safety coefficient and good in printing quality.
In order to solve the technical problems, the technical scheme of the invention is as follows: a multi-color flat screen plate curved surface printing machine is characterized in that: comprises a frame, a plurality of printing stations for realizing multi-color register; the printing station comprises a flat screen plate and a scraping printing assembly which are arranged on the frame, wherein the scraping printing assembly is positioned above the flat screen plate and is used for adsorbing ink in the flat screen plate on a printing stock through meshes of the flat screen plate; the curved surface platen assemblies comprise platen supports and rotating shafts for supporting printing objects, the rotating shafts are rotatably arranged on the platen supports through bearing assemblies, and curved surface rollers or holders for fixing the printing objects are arranged on the rotating shafts; the bedplate track driving mechanism is connected with each curved bedplate component and is used for driving the rotating shafts of each curved bedplate component to circularly translate on the same plane according to a closed track, and the closed track is provided with a straight line section which sequentially passes below the flat screen plate of each printing station; the screen plate follow-up driving mechanism is arranged on the frame and connected with each flat screen plate and used for driving each flat screen plate to synchronously translate; the die roller rotation driving mechanism is used for driving the rotation shafts positioned at all printing stations to synchronously rotate, and the rotation linear speed of the outer surface of a printing stock fixed on the curved die roller or the clamp is the same as the translation speed of all flat screen plates; the die roller rotation driving mechanism is provided with a clutch driving assembly and is used for driving the die roller rotation driving mechanism to be far away from or close to the rotating shaft so as to realize torque transmission or disconnection; the die roller angle locking mechanism comprises a movable locking assembly and a fixed unlocking assembly, wherein the movable locking assembly is arranged on each curved-surface platen assembly and used for locking the rotation of the rotating shaft relative to the platen bracket; the fixed unlocking component is arranged on the rack corresponding to each printing station, and can drive the movable locking component to act so as to unlock the rotating shaft after locking.
Further, the die roller rotation driving mechanism comprises a first end structure of a transmission pair, a second end structure of the transmission pair, a synchronous driving mechanism of the second end structure and a clutch driving assembly,
the first end structures of the transmission pairs correspond to the number of the rotating shafts, and are arranged on the rotating shafts;
the second end structure of the transmission pair corresponds to the printing station and is arranged on a frame corresponding to the printing station through an output end synchronous driving mechanism;
any one of the first end structures of the transmission pair is meshed with any one of the second end structures of the transmission pair to form a single-stage or multi-stage rotary transmission pair capable of realizing the rotation of the first end structure of the transmission pair;
the second end synchronous driving mechanism is used for driving the second end structures of the transmission pairs to synchronously act and driving the first end structures of the transmission pairs meshed with the second end structures of the transmission pairs to synchronously rotate;
the clutch driving assembly is used for driving the second end structure of the transmission pair to be far away from or close to the first end structure of the transmission pair so as to realize the transmission or disconnection of torque between the rotating shaft and the second end synchronous driving mechanism.
Further, the first end structure of the transmission pair is a first transmission belt wheel;
the second end structure of the transmission pair is a transmission belt, the transmission belt is a double-sided transmission structure with tooth grooves or chain grooves on the inner periphery and the outer periphery, and the tooth grooves or chain grooves on the outer periphery of the transmission belt can be meshed with the first transmission belt wheel;
the second end synchronous driving mechanism comprises a second end synchronous driving support, a second transmission belt pulley and a rotating shaft driving motor, the second end synchronous driving support is arranged on the frame through a clutch driving assembly, the second transmission belt pulley and the rotating shaft driving motor for driving the second transmission belt pulley to rotate are arranged on the second end synchronous driving support, the transmission belt is arranged on the second transmission belt pulley, and an inner peripheral tooth-shaped groove or a chain groove of the transmission belt is meshed with the second transmission belt pulley.
Further, the second end synchronous driving mechanism further comprises a third driving belt pulley which can correspond to each first driving belt pulley, and the third driving belt pulley is arranged on the second end synchronous driving bracket and is arranged on the inner peripheral side of the driving belt to be meshed with the inner peripheral tooth-shaped groove or the chain groove of the driving belt;
the second end synchronous driving support can be driven by the clutch driving assembly to approach the curved platen assembly, so that the peripheral tooth-shaped groove or the chain groove of the transmission belt is meshed with the first transmission belt pulley, and the periphery of the transmission belt is pressed on the first transmission belt pulley by the third transmission belt pulley.
Further, the first end structure of the transmission pair is a gear;
the second end structure of the transmission pair is a rack;
the second end synchronous driving mechanism is a rack linear driving mechanism.
Further, the rack linear driving mechanism comprises a rotary shaft driving motor and a gear, wherein the gear is meshed with the rack, and the gear is connected with an output shaft of the rotary shaft driving motor.
Further, the rack linear driving mechanism is a screw-nut pair driven by a rotary shaft driving motor.
Further, the rack linear driving mechanism is an electric push rod.
Further, the first end structure of the transmission pair is one of an internal spline structure and an external spline structure;
the second end structure of the transmission pair is the other one of an internal spline structure and an external spline structure;
the second end synchronous driving mechanism is a spline rotation driving mechanism for driving the second end structure of the transmission pair to rotate.
Further, the clutch driving assembly is a linear driving mechanism and is used for driving the second end structure of the transmission pair to move away from or close to the first end structure of the transmission pair along the horizontal direction or the vertical direction.
Further, the movable locking component of the die roller angle locking mechanism comprises a locking block provided with a reset spring, the first end of the rotating shaft or the transmission pair is structurally provided with positioning slotted holes which are uniformly distributed in a ring shape along the circumferential direction, and the locking block is embedded into the positioning slotted holes under the action of the reset spring.
Further, the fixed unlocking component of the die roller angle locking mechanism is an air cylinder or an electric push rod or an electromagnet component which is arranged at each printing station.
Further, the mechanism for carrying out secondary positioning on the curved surface platen assembly is further included, the curved surface platen assembly positioning mechanism comprises a pair of positioning wheels, a positioning reference rod and a reference rod driving mechanism, the positioning wheels are arranged on a platen support of the curved surface platen assembly, the rotating axes of the positioning wheels are vertically arranged, a gap for just accommodating the embedding of the positioning reference rod is formed between the positioning wheels, the positioning reference rod and the reference rod driving mechanism are installed on a frame at a printing station, and the positioning reference rod can be driven by the reference rod driving mechanism to be embedded into or separated from the gap.
Further, the screen plate follow-up driving mechanism comprises a screen plate linear driving mechanism for linearly moving the flat screen plate and a horizontal sliding block guide rail assembly for guiding and limiting the moving direction of the flat screen plate.
Further, the screen plate linear driving mechanism comprises a plurality of racks which are corresponding to the number of the flat screen plates and are connected into a whole, and a gear which can be meshed with the racks, wherein the gear is driven by the screen plate driving motor to rotate, and each rack is fixedly connected with each flat screen plate.
Further, the screen plate linear driving mechanism comprises a fourth driving belt wheel, a screen plate driving motor and driving belts, at least two fourth driving belt wheels are arranged on the frame, the driving belts are arranged on the fourth driving belt wheels, each driving belt is provided with at least one driving belt linear section, and the driving belt linear sections are fixedly connected with each flat screen plate.
Further, a height adjusting mechanism and a vertical sliding block guide rail assembly for guiding and limiting the lifting of the flat screen plate are arranged on the flat screen plate.
The invention has the advantages that:
in theory, a plurality of independent servo motors are directly adopted to independently control each die roller, so that the problem of consistency of reference positions can be solved by utilizing a braking or self-locking module of the servo motors, and synchronous rotation of each die roller can be smoothly realized; however, the number of the die rollers of the circular and oval printing machine is numerous, so that the cost is increased directly, and the printing machine has no competitiveness; more importantly, as the mold roller in the circular or elliptical printing machine is required to run on the same plane according to a circular or elliptical track, a sliding contact line is required to be adopted for supplying power to a servo motor moving along with the mold roller, and a great potential safety hazard exists in the textile printing industry with extremely high fireproof requirements. The invention utilizes the die roller rotary driving mechanism and the die roller angle locking mechanism to accurately control the angle and the position of the rotary shaft, thereby solving the problem that the positioning of multiple color sets in curved surface screen printing can not be realized; the die roller rotary driving mechanism is provided with a clutch driving assembly for driving the die roller rotary driving mechanism to be far away from or close to the rotary shaft to realize torque transmission or disengagement, so that the rotary shaft can be rotated in a centralized synchronous driving mode, the problem of moving interference of the rotary shaft driving mechanism is avoided, and multi-color high-precision printing on the elliptical screen printing machine is realized smoothly.
The die roller angle locking mechanism adopts split type design, so that the position positioning requirement of the die roller in the printing process can be met, and the problem that the structure is too complicated or power supply is caused by the fact that the moving locking assembly and the fixed unlocking assembly in the integrated structure are required to meet the moving requirement of the die roller can be avoided.
Drawings
FIG. 1 is a front view of a multi-color flat screen printing machine according to the invention.
FIG. 2 is a top view of the multi-color flat screen printing machine of the invention.
Fig. 3 is a side view of the multi-color flat screen printing machine of the present invention.
Fig. 4 is a partial schematic view of the present invention.
Fig. 5 is a schematic structural view of a first embodiment of a die cylinder rotation driving mechanism according to the present invention.
FIG. 6 is a schematic view of a second embodiment of a die cylinder rotation driving mechanism according to the present invention.
FIG. 7 is a schematic view of a die cylinder angle locking mechanism according to the present invention.
FIG. 8 is a schematic diagram of a linear driving mechanism of a screen according to the present invention.
FIG. 9 is a schematic view of a curved platen assembly positioning mechanism according to the present invention.
Detailed Description
As shown in fig. 1, 2 and 3, the embossing machine comprises a frame 1, an embossing station 2, a curved platen assembly 3, a platen track driving mechanism, a screen plate follow-up driving mechanism 5, a die roller rotation driving mechanism 6 and a die roller angle locking mechanism 7.
The frame 1 is provided with a plurality of printing stations 2 for realizing multi-color, the plurality of printing stations 2 can be arranged continuously or at intervals, and when the printing stations are arranged at intervals, a drying station or other stations can be arranged at the next or two stations of each printing station 2.
The printing station 2 is shown in fig. 4, and comprises a flat screen 21 and a scraping and printing assembly 22 which are arranged on the frame 1, wherein the scraping and printing assembly 22 is positioned above the flat screen 21 and is used for adsorbing ink in the flat screen 21 on a printing stock through meshes of the flat screen 21. The doctor assembly 22 is a conventional assembly on a printing machine, and generally includes a switchable doctor blade and an ink return blade, and has an up-and-down movement function, which will not be described again. The flat screen plate 21 can be further provided with a height adjusting mechanism, a driving cylinder 23 for driving and guiding and limiting the lifting of the flat screen plate 21, and a vertical sliding block guide rail assembly 24 for controlling the flat screen plate 21 to move up and down to be close to or far away from the curved surface platen assembly 3 below; furthermore, the relative spatial position of the flat screens 21 on the printing stations 2 can be fine-tuned so that the positions of the flat screens 21 relative to the printing stations 2 are uniform.
The curved platen assembly 3, as shown in fig. 4, the curved platen assembly 3 includes a platen support 31 and a rotating shaft 32 for supporting a printing object, the rotating shaft 32 is rotatably mounted on the platen support 31 through a bearing assembly 33, a curved die roll 34 or a gripper for fixing the printing object is mounted on the rotating shaft 32, and the curved die roll needs to have a circular arc-shaped outer surface.
The platen track driving mechanism is connected with each curved platen assembly 3 and is used for driving the rotating shafts of each curved platen assembly 3 to circularly translate on the same plane according to a closed track, and the closed track is provided with a straight line section which sequentially passes below the flat screen 21 of each printing station and covers a plurality of printing stations, so that one mold roller rotating driving mechanism 6 smoothly drives the rotating shafts of the plurality of printing stations, and meanwhile, the structural complexity is reduced. In the embodiment of the invention, the elliptical track is an elliptical machine commonly known in the printing industry, and of course, the elliptical track is not completely elliptical, and two opposite sides of the rectangle are changed into arc shapes.
The screen plate follow-up driving mechanism 5 is arranged on the frame 1 and connected with each flat screen plate 21, and is used for driving each flat screen plate 21 to synchronously translate.
And the die roller rotation driving mechanism 6 is used for driving the rotation shafts at all printing stations to synchronously rotate, and the rotation linear speed of the outer surface of the printing stock fixed on the curved die roller or the clamp is the same as the translation speed of all flat screen plates. And the die cylinder rotation driving mechanism 6 is provided with a clutch driving assembly 64 for driving the die cylinder rotation driving mechanism to be far away from or close to the rotating shaft so as to realize torque transmission or disconnection. Of course, the die cylinder rotation driving mechanism 6 mounted on the frame 1 may be one or a plurality of.
The die roller angle locking mechanism 7 comprises a movable locking assembly 71 and a fixed unlocking assembly 72, wherein the movable locking assembly 71 is arranged on each curved platen assembly 3 and is used for locking the rotation of the rotating shaft relative to the platen bracket; the fixed unlocking component is arranged on the rack corresponding to each printing station, and can drive the movable locking component to act so as to unlock the rotating shaft after locking.
In the die cylinder rotation driving mechanism 6 of the present invention,
the die roller rotation driving mechanism 6 comprises a transmission pair first end structure, a transmission pair second end structure, a second end structure synchronous driving mechanism and a clutch driving assembly;
the first end structures of the transmission pairs are corresponding to the number of the rotating shafts 32, and are arranged on the rotating shafts 32;
the second end structure of the transmission pair corresponds to the printing station 2, and is arranged on the frame 1 corresponding to the printing station through the synchronous driving mechanism of the output end;
any one of the first end structures of each transmission pair is meshed with any one of the second end structures of each transmission pair to form a single-stage or multi-stage rotary transmission pair capable of realizing the rotation of the first end structure of the transmission pair;
the second end synchronous driving mechanism is used for driving the second end structures of the transmission pairs to synchronously act and driving the first end structures of the transmission pairs meshed with the second end structures of the transmission pairs to synchronously rotate;
the clutch driving assembly is not only used for driving the second end structure of the transmission pair to be far away from or close to the first end structure of the transmission pair to realize the transmission or disconnection of torque between the rotating shaft 32 and the second end synchronous driving mechanism, but also can avoid the mutual interference between the curved platen assembly 3 and other parts except the first end structure of the transmission pair in the die roller rotary driving mechanism 6 in the moving process.
As a first more specific structure of the die cylinder rotation driving mechanism 6 of the present invention: as shown in figures 4 and 5 of the drawings,
the first end structure of the transmission pair is a first transmission belt wheel 61;
the second end structure of the transmission pair is a transmission belt 62, the transmission belt 62 is a double-sided transmission structure with tooth grooves or chain grooves on the inner periphery and the outer periphery, and the tooth grooves or chain grooves on the outer periphery of the transmission belt 62 can be meshed with the first transmission belt pulley 61; of course, those skilled in the art will appreciate that a drive pulley typically employs a timing pulley or sprocket, and that the drive belt may be a timing belt or chain engaged therewith; the direction and speed of the synchronous translation of the conveyor belt and the flat screen 21 are obviously required to be consistent, and will not be described again here.
The second end synchronous driving mechanism comprises a second end synchronous driving bracket 631, a second transmission belt pulley 632 and a rotating shaft driving motor 633, the second end synchronous driving bracket 631 is arranged on the frame 1 through a clutch driving assembly 64, the second transmission belt pulley 632 and the rotating shaft driving motor 633 for driving the second transmission belt pulley 632 to rotate are arranged on the second end synchronous driving bracket 631, the transmission belt 62 is arranged on the second transmission belt pulley 632, and an inner circumference tooth-shaped groove or chain groove of the transmission belt 62 is meshed with the second transmission belt pulley 63;
in order to ensure that the belt 62 is driven in a better engagement with the first pulleys 61, the second end timing drive mechanism further includes a third pulley 634 corresponding to the position of each of the first pulleys 61, and the third pulley 634 is mounted on the second end timing drive bracket 631 and is disposed on the inner peripheral side of the belt 62 to be engaged with the belt inner peripheral tooth groove or chain groove. The second end synchronous drive bracket 631 may be driven by the clutch drive assembly 64 toward the curved platen assembly 3 such that the outer peripheral toothed groove or chain groove of the belt 62 meshes with the first pulley 61 and the outer periphery of the belt 62 is pressed against the first pulley 61 by the third pulley 634. In order for the third pulley 634 to better press the belt 62 against the first pulley 61, the third pulley 634 is provided with a compression spring 635.
The clutch drive assembly 64 is a linear drive mechanism for driving the secondary drive end structure to move away from or toward the secondary drive end structure in a horizontal or vertical direction. The structure of the linear driving mechanism is a well-known technology in the mechanical industry, and the structure is various and will not be described herein.
Of course, the die cylinder rotation driving mechanism 6 of the present invention is not limited to the above-described more specific structure, and may be of a second structure as shown in fig. 6:
the first end structure of the transmission pair is a gear 65;
the second end structure of the transmission pair is a rack 66, and the movement direction of the rack 66 is required to be consistent with the synchronous translation direction of the flat screen 21; the rack 66 can be a plurality of rack segments respectively arranged on the printing stations 2, and the rack segments are fixedly connected through a bracket to realize linkage so as to be respectively matched with the racks 66 moving to the printing stations 2, or a long rack can be adopted;
the second end synchronous driving mechanism is a rack linear driving mechanism 67, and the rack linear driving mechanism 67 has more choices, for example: the device comprises a rotary shaft driving motor and a gear, wherein the gear is meshed with the rack and is connected with an output shaft of the rotary shaft driving motor; or the rack linear driving mechanism is a screw-nut pair driven by a rotary shaft driving motor. Or the rack linear driving mechanism is an electric push rod.
The clutch drive assembly 64 is not described in detail herein.
As a third more specific structure of the die cylinder rotation driving mechanism 6 of the present invention:
the first end structure of the transmission pair is one of an internal spline structure and an external spline structure;
the second end structure of the transmission pair is the other one of an internal spline structure and an external spline structure;
the second end synchronous driving mechanism is a spline rotation driving mechanism for driving the second end structure of the transmission pair to rotate, and the second end synchronous driving mechanism can synchronously drive in a synchronous belt transmission or chain transmission mode, for example, the first more specific structure in the die roller rotation driving mechanism 6 of the invention is adopted, and the description is omitted here.
In the invention, a more specific die roller angle locking mechanism is as follows: as shown in figure 7 of the drawings,
the movable locking component 71 of the die roller angle locking mechanism 7 moves along with the curved platen component 3 and comprises a locking block provided with a return spring, and the first end structure of the rotating shaft or the transmission pair is provided with positioning slots which are uniformly distributed in a ring shape along the circumferential direction, and the locking block is embedded into the positioning slots under the action of the return spring. After the locking block is embedded into the positioning slot hole, the rotating shaft can be locked, and the rotation of the rotating shaft is avoided.
If the first end structure of the transmission pair adopts a synchronous belt wheel, a chain wheel or a spline, the synchronous belt wheel, the chain wheel or the spline is directly used as positioning slotted holes which are uniformly distributed in a ring shape along the circumferential direction, the direction of embedding the locking blocks into the positioning slotted holes is the axial direction of the rotating shaft or the radial direction of the rotating shaft, and the locking blocks can also be obliquely inserted in a lever type.
The fixed unlocking component 72 of the die roller angle locking mechanism 7 is a cylinder or an electric push rod or an electromagnet component fixedly installed at each printing station. The fixed unlocking component 72 can act after the movable locking component 71 moves to the printing station, and the locking block is pushed open, so that the unlocking of the rotating shaft can be realized.
As a more specific embodiment of the present invention: the screen follower driving mechanism 5 includes a screen linear driving mechanism 51 for linearly moving the flat screen 21, and a horizontal slider rail assembly 52 for guiding and limiting the moving direction of the flat screen 21. It should be noted here that the direction of linear movement of the flat screen 21 is obviously identical to the direction of rotation of the highest point of the printing surface of the object placed on the curved platen assembly 3, and of course, the movement speed is also required to be identical in general.
As shown in fig. 8, the screen linear driving mechanism 51 includes a fourth driving pulley 514, a screen driving motor, and a driving belt 515, at least two fourth driving pulleys 514 are mounted on the frame 1, the driving belt 515 is sleeved on the fourth driving pulley 514, and the driving belt 515 has at least one driving belt linear section, and the driving belt linear section is connected and fixed with each flat screen 21 through a connecting piece. The direction of extension of the straight section of the belt is consistent with the direction of rotation of the highest point of the printing surface of the printing material on the curved platen assembly 3.
In this embodiment, the mesh plate linear driving mechanism 51 is not limited to a synchronous transmission structure with synchronous belt and synchronous wheel, but may be other synchronous direct driving structures; for example, the screen linear driving mechanism 51 includes a plurality of racks which are corresponding to the number of the flat screens 21 and are connected with each other into a whole, and at least one gear which can be meshed with the racks, the gear is driven to rotate by a screen driving motor, and each rack is connected and fixed with each flat screen 21. Of course, the direction of extension of the racks coincides with the direction of rotation of the highest point of the printing surface of the substrate on the curved platen assembly 3.
To further ensure the accuracy of multi-register curved printing, the location of the curved platen assembly 3 at the printing station 2 also requires precise positioning:
the invention also comprises a mechanism for carrying out secondary positioning on the curved platen assembly 3, as shown in fig. 9, the curved platen assembly positioning mechanism comprises a positioning wheel 81, a positioning reference rod 82 and a reference rod driving mechanism 83, the positioning wheel 81 is provided with a pair, the positioning wheel 81 is arranged on the platen bracket 31 of the curved platen assembly 3, the rotation axes of the positioning wheels 81 are vertically arranged, a gap for just accommodating the positioning reference rod 82 is arranged between the positioning wheels 81, the positioning reference rod 82 and the reference rod driving mechanism 83 are arranged on the frame 1 at the printing station 2, and the positioning reference rod 82 can be driven by the reference rod driving mechanism 83 to be embedded into or separated from the gap.
Working principle:
in the initial state, the locking blocks of the movable locking assembly 71 are embedded into the positioning slots under the action of the reset springs, and lock the rotation of the rotating shaft relative to the platen support, so that the object to be printed is fixedly placed on the surface of each curved die roller, and if the object to be printed is a hard cylinder or the area to be printed has an arc-shaped outer circumferential surface, the object to be printed can also be fixed on the rotating shaft through the clamp;
the platen track driving mechanism drives each curved platen component 3 to circularly translate on the same plane according to a closed track and sequentially move to the position below the flat screen plate 21 of each printing station;
the clutch driving assembly of the die roller rotation driving mechanism drives the second end structures of the transmission pairs to be close to the first end structure of the transmission pairs, and the first end structure of the transmission pairs and the second end structure of the transmission pairs are meshed; simultaneously, the fixed unlocking component of the die roller angle locking mechanism 7 acts to unlock the rotating shaft after locking, namely, the cylinder pushes the locking block to leave the positioning slot hole against the deformation force of the reset spring, and the state is kept;
after unlocking, the synchronous driving mechanism of the second end structure of the transmission pair works to drive the second end structure of each transmission pair to drive the first end structure of the transmission pair meshed with the second end structure of each transmission pair to synchronously rotate, so that each corresponding curved surface platen assembly synchronously rotates by a certain angle, and the printing surface of an object to be printed on the curved surface platen assembly is upwards positioned before printing;
the flat screen board descends in a matched manner through the height adjusting mechanism and the vertical sliding block guide rail, so that the flat screen board is close to a to-be-printed object on the curved surface platen assembly, and a certain screen distance is kept; and the scraper of the scraping and printing assembly 22 is opposite to the axis of the rotating shaft and descends to a certain height, so that the flat screen plate is attached to the object to be printed;
the screen plate follow-up driving mechanism drives the flat screen plate to synchronously translate, and simultaneously, the curved surface platen component rotates under the driving of the die roller rotating driving mechanism, so that the surface linear speed of the object to be printed is ensured to be consistent with the moving speed of the flat screen plate, and the ink in the flat screen plate 21 is scraped on the object to be printed under the screen mesh of the flat screen plate 21 by utilizing a static scraper, so that printing is completed;
after printing is completed, the fixed unlocking component 72 of the die roller angle locking mechanism 7 acts, so that the locking blocks of the movable locking component 71 are reset and re-embedded into the positioning slots under the action of the reset springs, and the rotating shaft is locked relative to the platen bracket; the clutch driving assembly drives the second end structure of the transmission pair to be far away from the first end structure of the transmission pair so as to realize the disconnection between the rotating shaft 32 and the second end synchronous driving mechanism; the scraping and printing assembly and the flat screen plate are sequentially moved upwards for resetting;
the platen track driving mechanism drives each curved platen component 3 to continuously move forward, so that the printing stock just after printing enters the next station, the surface of the printing stock is dried or printed for the second time, and the cyclic action realizes multi-color printing of the printing stock.
Claims (16)
1. A multi-color flat screen plate curved surface printing machine is characterized in that: comprising
The machine frame is provided with a plurality of printing stations for realizing multi-color registration;
the printing station comprises a flat screen plate and a scraping printing assembly which are arranged on the frame, wherein the scraping printing assembly is positioned above the flat screen plate and is used for adsorbing ink in the flat screen plate on a printing stock through meshes of the flat screen plate;
the curved surface platen assemblies comprise platen supports and rotating shafts for supporting printing objects, the rotating shafts are rotatably arranged on the platen supports through bearing assemblies, and curved surface rollers or holders for fixing the printing objects are arranged on the rotating shafts;
the bedplate track driving mechanism is connected with each curved bedplate component and is used for driving the rotating shafts of each curved bedplate component to circularly translate on the same plane according to a closed track, and the closed track is provided with a straight line section which sequentially passes below the flat screen plate of each printing station;
the screen plate follow-up driving mechanism is arranged on the frame and connected with each flat screen plate and used for driving each flat screen plate to synchronously translate;
the die roller rotation driving mechanism is used for driving the rotation shafts positioned at all printing stations to synchronously rotate, and the rotation linear speed of the outer surface of a printing stock fixed on the curved die roller or the clamp is the same as the translation speed of all flat screen plates; the die roller rotation driving mechanism is provided with a clutch driving assembly and is used for driving the die roller rotation driving mechanism to be far away from or close to the rotating shaft so as to realize torque transmission or disconnection;
the die roller angle locking mechanism comprises a movable locking assembly and a fixed unlocking assembly, wherein the movable locking assembly is arranged on each curved-surface platen assembly and used for locking the rotation of the rotating shaft relative to the platen bracket; the fixed unlocking component is arranged on the rack corresponding to each printing station and can drive the movable locking component to act so as to unlock the rotating shaft after locking;
the die roller rotation driving mechanism comprises a transmission pair first end structure, a transmission pair second end structure, a second end structure synchronous driving mechanism and a clutch driving assembly,
the first end structures of the transmission pairs correspond to the number of the rotating shafts, and are arranged on the rotating shafts;
the second end structure of the transmission pair corresponds to the printing station and is arranged on a frame corresponding to the printing station through an output end synchronous driving mechanism;
any one of the first end structures of the transmission pairs is meshed with any one of the second end structures of the transmission pairs to form a single-stage or multi-stage rotary transmission pair capable of realizing the rotation of the first end structures of the transmission pairs;
the second end synchronous driving mechanism is used for driving the second end structures of the transmission pairs to synchronously act and driving the first end structures of the transmission pairs meshed with the second end structures of the transmission pairs to synchronously rotate;
the clutch driving assembly is used for driving the second end structure of the transmission pair to be far away from or close to the first end structure of the transmission pair so as to realize the transmission or disconnection of torque between the rotating shaft and the second end synchronous driving mechanism.
2. The multi-color flat type screen printing machine according to claim 1, wherein:
the first end structure of the transmission pair is a first transmission belt wheel;
the second end structure of the transmission pair is a transmission belt, the transmission belt is a double-sided transmission structure with tooth grooves or chain grooves on the inner periphery and the outer periphery, and the tooth grooves or chain grooves on the outer periphery of the transmission belt can be meshed with the first transmission belt wheel;
the second end synchronous driving mechanism comprises a second end synchronous driving support, a second transmission belt pulley and a rotating shaft driving motor, the second end synchronous driving support is arranged on the frame through a clutch driving assembly, the second transmission belt pulley and the rotating shaft driving motor for driving the second transmission belt pulley to rotate are arranged on the second end synchronous driving support, the transmission belt is arranged on the second transmission belt pulley, and an inner peripheral tooth-shaped groove or a chain groove of the transmission belt is meshed with the second transmission belt pulley.
3. The multi-color flat type screen printing machine according to claim 2, wherein: the second end synchronous driving mechanism further comprises a third driving belt pulley which can correspond to each first driving belt pulley, and the third driving belt pulley is arranged on the second end synchronous driving bracket and is meshed with the inner peripheral tooth-shaped groove or the chain groove of the driving belt on the inner peripheral side of the driving belt;
the second end synchronous driving support can be driven by the clutch driving assembly to approach the curved platen assembly, so that the peripheral tooth-shaped groove or the chain groove of the transmission belt is meshed with the first transmission belt pulley, and the periphery of the transmission belt is pressed on the first transmission belt pulley by the third transmission belt pulley.
4. The multi-color flat type screen printing machine according to claim 1, wherein:
the first end structure of the transmission pair is a gear;
the second end structure of the transmission pair is a rack;
the second end synchronous driving mechanism is a rack linear driving mechanism.
5. The multi-color flat type screen printing machine according to claim 4, wherein: the rack linear driving mechanism comprises a rotary shaft driving motor and a gear, wherein the gear is meshed with the rack, and the gear is connected with an output shaft of the rotary shaft driving motor.
6. The multi-color flat type screen printing machine according to claim 4, wherein: the rack linear driving mechanism is a screw-nut pair driven by a rotary shaft driving motor.
7. The multi-color flat type screen printing machine according to claim 6, wherein: the rack linear driving mechanism is an electric push rod.
8. The multi-color flat type screen printing machine according to claim 1, wherein:
the first end structure of the transmission pair is one of an internal spline structure and an external spline structure;
the second end structure of the transmission pair is the other one of an internal spline structure and an external spline structure;
the second end synchronous driving mechanism is a spline rotation driving mechanism for driving the second end structure of the transmission pair to rotate.
9. The multi-color flat type screen printing machine according to any one of claims 1 to 8, wherein: the clutch driving assembly is a linear driving mechanism and is used for driving the second end structure of the transmission pair to move away from or close to the first end structure of the transmission pair along the horizontal direction or the vertical direction.
10. The multi-color flat type screen printing machine according to claim 1, wherein: the movable locking component of the die roller angle locking mechanism comprises a locking block provided with a return spring, positioning slotted holes which are uniformly distributed in a ring shape along the circumferential direction are formed in the first end structure of the rotating shaft or the transmission pair, and the locking block is embedded into the positioning slotted holes under the action of the return spring.
11. The multi-color flat type screen printing machine according to claim 1 or 10, wherein: the fixed unlocking component of the die roller angle locking mechanism is an air cylinder or an electric push rod or an electromagnet component arranged at each printing station.
12. The multi-color flat type screen printing machine according to claim 1, wherein: the mechanism for carrying out secondary positioning on the curved surface platen assembly is further comprised, the curved surface platen assembly positioning mechanism comprises a pair of positioning wheels, a positioning reference rod and a reference rod driving mechanism, the positioning wheels are arranged on a platen support of the curved surface platen assembly, the rotating axes of the positioning wheels are vertically arranged, a gap for just accommodating the embedding of the positioning reference rod is arranged between the positioning wheels, the positioning reference rod and the reference rod driving mechanism are arranged on a frame at a printing station, and the positioning reference rod can be driven by the reference rod driving mechanism to be embedded into or separated from the gap.
13. The multi-color flat type screen printing machine according to claim 1, wherein:
the screen plate follow-up driving mechanism comprises a screen plate linear driving mechanism for linearly moving the flat screen plate and a horizontal sliding block guide rail assembly for guiding and limiting the moving direction of the flat screen plate.
14. The multi-color flat type screen printing machine according to claim 13, wherein: the screen plate linear driving mechanism comprises a plurality of racks which are corresponding to the number of the flat screen plates and are connected into a whole, and a gear which can be meshed with the racks, wherein the gear is driven by a screen plate driving motor to rotate, and each rack is fixedly connected with each flat screen plate.
15. The multi-color flat type screen printing machine according to claim 13, wherein: the screen plate linear driving mechanism comprises a fourth driving belt wheel, a screen plate driving motor and driving belts, wherein at least two fourth driving belt wheels are arranged on the frame, the driving belts are arranged on the fourth driving belt wheels and are provided with at least one driving belt linear section, and the driving belt linear sections are fixedly connected with each flat screen plate.
16. The multi-color flat type screen printing machine according to claim 1, wherein: the height adjusting mechanism and the vertical sliding block guide rail assembly for guiding and limiting the lifting of the flat screen plate are arranged on the flat screen plate.
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| CN110561894B (en) * | 2019-09-03 | 2024-05-28 | 如皋市天元服饰印业有限公司 | Rapid positioning device for screen plate of multi-color printing machine and method for positioning screen plate |
| CN112247764B (en) * | 2020-10-15 | 2022-04-15 | 福清市福强家俱有限公司 | Vertical belt moving type edge grinding machine and woodworking edge grinding method |
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