CN110481169B - Signal selection plate for ink-jet printer and signal selection method - Google Patents
Signal selection plate for ink-jet printer and signal selection method Download PDFInfo
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- CN110481169B CN110481169B CN201910816136.2A CN201910816136A CN110481169B CN 110481169 B CN110481169 B CN 110481169B CN 201910816136 A CN201910816136 A CN 201910816136A CN 110481169 B CN110481169 B CN 110481169B
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- 238000010187 selection method Methods 0.000 title claims abstract description 13
- 238000007639 printing Methods 0.000 claims abstract description 182
- 239000007921 spray Substances 0.000 claims description 49
- 238000000034 method Methods 0.000 claims description 30
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000000976 ink Substances 0.000 description 31
- 238000007641 inkjet printing Methods 0.000 description 23
- 239000010410 layer Substances 0.000 description 14
- 230000033001 locomotion Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 239000003086 colorant Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000002355 dual-layer Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000003854 Surface Print Methods 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002508 contact lithography Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007592 spray painting technique Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
- B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
- B41J3/40733—Printing on cylindrical or rotationally symmetrical objects, e. g. on bottles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
- B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Ink Jet (AREA)
Abstract
The invention provides a signal selection board for an ink-jet printer and a signal selection method, comprising a signal receiving end, a signal selection end, a chip and a signal output end, wherein the signal receiving end is connected with at least two jigs and is used for receiving signals sent by encoders arranged on the jigs, the signal selection end is used for receiving enabling signals sent by a printing station, the enabling signals are used for feeding back which jig is positioned at a printing position to prepare a printing job, the chip which receives the enabling signals converts and transmits the received encoder signals, finally, the converted signals are transmitted to the signal output end, and the signal output end transmits the signals to a control board for controlling the printer to print. The signal selection plate is used for selecting the rotating signal of the object to be printed positioned at the printing station and carrying out feedback conversion transmission, so that the printing quality of the object to be printed on each independently controlled rotating jig can be ensured to meet the requirements.
Description
Technical Field
The invention relates to a signal selection plate and a signal selection method for an ink-jet printer, in particular to a signal selection plate and a signal selection method for an ink-jet printer, which are applied to an intermittent rotary transmission process and are used for printing cylinders, cones or cylindrical/conical objects in a printing area.
Background
The inkjet printing technology refers to a technology of ejecting ink droplets onto an object to be printed through a head to obtain a printed image or text. The technology is non-contact printing, has the advantages of high printing speed, small pollution, adaptability to various objects to be printed and the like, and is widely applied to the field of industrial application. The ink jet printing is divided into Scanning type (Scanning) ink jet printing and one-time paper feeding imaging (Onepass) ink jet printing according to the movement modes of the printing trolley and the object to be printed, wherein the Scanning type ink jet printing comprises two types of roll-to-roll type ink jet printing and platform type ink jet printing, the printing trolley moves back and forth along the guide rail beam relative to the object to be printed in the ink jet printing process, the object to be printed moves relatively along the direction perpendicular to the movement direction of the printing trolley, and the guide rail beam on which the printing trolley is arranged is stationary; the platform ink-jet printing has two conditions in the ink-jet printing process, one is that the guide rail beam is not moved in the ink-jet printing process, the printing trolley moves back and forth along the guide rail beam, and the printing platform moves relatively along the direction perpendicular to the moving direction of the printing trolley; still another is that the printing platform is stationary, the print carriage moves back and forth along the rail beam relative to the object to be printed, and the print carriage moves relatively in a direction perpendicular to the rail beam. And the printing trolley is stationary in the process of ink jet printing by one-time paper feeding imaging, and the object to be printed moves unidirectionally at high speed. The printing precision and the printing width of the spray head are required to be high by adopting one-time paper feeding imaging ink-jet printing, the printing precision of the spray head is required to be the printing precision of an image, and the printing width of the spray head is required to be the printing width of the image, so that the high precision is obtained in a mode of splicing the spray heads and the wider printing width is obtained in a mode of connecting the spray heads in series.
The method is generally used for printing planar objects, along with the enhancement of individuation requirements, more and more curved-surface objects also need digital printing, when the objects are cylinders, cones or areas to be printed are cylinders or cones, the conventional printing mode cannot be used, and special inkjet printing equipment aiming at curved-surface printing is needed, the objects to be printed possibly need pretreatment operation before printing and complete solidification operation after printing, in order to improve the overall working efficiency, the objects to be printed can be conveyed in a rotary turntable mode, so that a plurality of stations can be arranged to synchronously carry out different operations according to requirements, the working efficiency is improved, a plurality of jigs are needed to be arranged to install the objects to be printed, and each jig is needed to install independent motors to drive the motion of the objects to be printed, so that how to accurately feed back the motion information of the objects to be printed at the printing stations is needed, and a key technical problem is formed by controlling the nozzle to accurately ink.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a signal selection plate and a signal selection method for an inkjet printer, which are matched with a rotary conveying device to improve the printing quality.
The invention provides a signal selecting board for an ink-jet printer, which is characterized by comprising a signal receiving end, a signal selecting end, a chip and a signal output end, wherein the signal receiving end is connected with at least two jigs and is used for receiving signals sent by encoders arranged on the jigs, the signal selecting end is used for receiving enabling signals sent by a printing station, the enabling signals are used for feeding back which jig is positioned at a printing position to prepare a printing job, the chip receiving the enabling signals converts and transmits the received encoder signals, finally, the converted signals are transmitted to the signal output end, and the signal output end transmits the signals to a control board for controlling the printer to print.
In the signal selection plate, a driving motor and an encoder are respectively arranged on each jig.
In the signal selection board, the chip that does not receive the enable signal does not transmit the encoder signal.
In the signal selection board, the chips comprise differential-to-single-ended chips, and the number of the differential-to-single-ended chips is the same as the number of the jigs.
In the signal selection board, a switching power supply circuit, a filter circuit, an expansion circuit, a jumper wire selection power supply circuit and a matching electrical impedance interference circuit are further arranged on the signal selection board.
In the signal selection plate, the object to be printed which is arranged on the jig is a cylinder, a cone or an object with a printing area of cylinder/cone, and in the printing process, the object to be printed rotates around the central shaft at a uniform speed, and the encoder is used for receiving the rotation signal.
The invention provides a signal selection method for an ink-jet printer, which comprises the following steps:
the method comprises the steps that at least two jigs intermittently rotate to transmit an object to be printed to a printing station for printing operation, a jig trigger switch reaching the printing station sends out an enabling signal, and the enabling signal is used for feeding back which jig reaches the printing station;
the second step, the signal selection board receives the enabling signals fed back by the printing stations, and controls the chips of the corresponding stations in the signal selection board to be in an enabling state, the chips in the enabling state convert and transmit signals sent by encoders installed on the jigs reaching the printing stations, and the converted signals are finally transmitted to the signal output end;
thirdly, the signal output end transmits the converted signal to the control board;
And fourthly, the control board controls the spray head to print the object to be printed in the jig on the printing station according to the received signal.
In the signal selection method, the jig is respectively provided with an object to be printed, wherein the object to be printed is a cylinder, a cone or an object with a printing area of cylinder/cone, and the object to be printed rotates around the central shaft at a constant speed in the printing process.
In the signal selection method, a motor and an encoder for driving the object to be printed to rotate are respectively arranged on each jig, and signals sent by the encoder in the second step are received by a signal receiving end of the signal selection plate and then transmitted to the corresponding chip.
The invention also provides a signal selection method for the ink-jet printer, which comprises the following steps:
The method comprises the steps that a conveying device intermittently rotates to convey at least two objects to be printed, the objects to be printed are fixed in a jig, the conveying device rotates for one circle to at least set two printing stations, each printing station is provided with an independent printing unit, a jig trigger switch reaching the printing station sends out an enabling signal, and the enabling signal is used for feeding back which jig reaches which printing station;
The second step, the signal selection board receives the enabling signals fed back by each printing station, controls the corresponding chip in the signal selection board, which receives the enabling signals, to be in an enabling state, and the chip in the enabling state respectively converts and transmits the signals sent by the encoders mounted on the jigs reaching the printing stations, and the converted signals are finally transmitted to the signal output ends respectively;
Thirdly, the signal output end respectively transmits the converted signals to the control board;
And fourthly, respectively controlling the spray heads on the printing units in the printing stations to print the objects to be printed in the jigs on the printing stations by the control board according to the received signals.
The signal selection plate and the signal selection method for the ink-jet printer are used for matching with a printing device with ingenious structural design, a plurality of jigs are arranged on a transmission turntable of the printing device in a circumferential array mode, the jigs are used for installing and fixing objects to be printed, each object to be printed is transmitted in a rotating mode around a central shaft of the transmission turntable, the signal selection plate is used for receiving real-time rotation information, such as rotation speed, rotation angle and the like, of the objects to be printed, and then the information is transmitted to a spray head of a circuit control board control printing unit to receive inking data in a targeted mode, so that high-quality image-text information can be printed on the objects to be printed of each station.
Drawings
FIG. 1 is a schematic diagram of an inkjet printing apparatus according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of an ink jet printing apparatus according to another embodiment of the present invention;
FIG. 3 is a bottom view of a print carriage in one embodiment of the invention;
FIG. 4 is a schematic diagram of a printing unit in an ink jet printing apparatus according to the present invention;
FIG. 5 is a schematic view of a spray head protection mechanism according to the present invention;
FIG. 6 is a schematic diagram of a signal selection plate for an ink jet printing apparatus according to one embodiment of the present invention;
FIG. 7 is a top plan simulated view of a conveyor in yet another embodiment;
fig. 8 is a schematic structural view of the signal selection plate in the embodiment of fig. 7.
In the figure: the printing trolley 1, the printing beam 2, the ink scraping maintenance device 3, the object to be printed 4, the printing device supporting frame 5, the conveying device 6, the UV lamp curing device 7, the spray head protection mechanism 9, the spray head bottom plate 11, the spray head 12, the printing beam support 21, the first sensor transmitting end 01, the first sensor receiving end 02, the second sensor 91, the second sensor reflecting end 92, the second sensor transmitting light beam 90, the lead screw motor 93, the first limit switch 94, the second limit switch 95, the sliding block 96, the guide rail 97, the sensor cover plate 98, the transmitting hole 99, the conveying turntable 60, the first jig 61, the second jig 62, the third jig 63, the fourth jig 64, the divider 65, the motor 66, the pretreatment station P1, the printing station P2, the full curing station P3, the feeding and blanking station P4, the first station S1, the second station S2, the third station S3, the fourth station S4, the fifth station S5, the sixth station S6, the seventh station S7, the eighth station S8, the eleventh station S9, the eleventh station U-shaped chip 11, the third station U-shaped chip 20, the wiring chip differential chip 1, the wiring terminal JP-B-shaped terminal 2, the wiring chip 2.
Detailed Description
The signal selection plate and the signal selection method for an inkjet printer according to the present invention will be described in detail with reference to the accompanying drawings.
First, a printing apparatus of the present invention is described, and as shown in fig. 1 and 2, the inkjet printing apparatus of the present invention includes a printing unit, a wiping maintenance device 3, an object 4 to be printed, a conveying device 6, and a control system (not shown). The conveying device 6 is a rotary conveying device, a circular conveying turntable 60 is arranged in the middle, four jigs are arranged on the conveying turntable 60 at equal intervals in a circumferential array mode, and the jigs are respectively as follows: the first jig 61, the second jig 62, the third jig 63 and the fourth jig 64 are used for installing and fixing objects to be printed, in the working process, the four jigs perform intermittent rotary conveying, a motor 66 and a divider 65 are installed below the conveying turntable 60, and the motor 66 and the divider 65 are used for controlling the conveying and stopping of the conveying turntable 60. The printing unit is arranged at the position of the second jig 62 shown in the drawing, the printing unit comprises a printing trolley 1, a printing beam 2 and a printing beam support 21, the printing beam support 21 is arranged on the outer side of the second jig 62 in the conveying device 6, the printing beam 2 is arranged on the printing beam support 21 and used for supporting the printing beam, the printing trolley 1 is arranged on the printing beam 2, the printing trolley 1 can reciprocate along the printing beam 2, namely the X-axis direction (first direction), a wiping maintenance device 3 is arranged below one side (initial position of the printing trolley 1) of the printing beam 2, and the wiping maintenance device 3 is used for conducting wiping or moisturizing maintenance operation on a spray head on the printing trolley 1.
It should be noted that the object to be printed may be a cylinder or a cone, or may be an object whose printing area is a cylinder or a cone, the design of the jig should satisfy that not only the object to be printed with different lengths may be installed, but also the parallelism of the upper surface of the object to be printed may be adjusted to print the object to be printed with different tapers, each jig is provided with an independent driving motor and an encoder, the driving motor is used to drive the rotation of the object to be printed around its central axis, the encoder is used to detect and feedback the rotation information of the object to be printed, such as the rotation speed, the rotated angle, the number of turns, and other related information, and the invention does not limit the specific structure of the jig. The arrangement of the four working stations in an equidistant array corresponds to the arrangement of the four jigs, specifically, as shown in the current position in fig. 2, the arrangement of the station P1 beside the position where the first jig 61 is located in the figure can be designed as a pretreatment station, where some pretreatment work before printing is performed on the object to be printed, such as quenching work or dust removal work (how to operate the figure is not shown in detail); a station P2, in this embodiment designed as a printing station, is arranged beside the position of the second jig 62 in the figure, and the station is provided with a printing unit for ejecting ink drops to form a desired image and text; a station P3 is disposed beside the position of the third jig 63 in the figure, which can be designed as a complete curing station for completely curing the graphic text sprayed on the object to be printed; the position beside the fourth jig 64 in the figure is provided with a station P4, which can be designed as a loading and unloading station for loading and unloading the objects to be printed.
The following describes a specific working procedure of the printing apparatus by taking an object to be printed as an example: firstly, an operator places an object to be printed at a station P4, which is referred to as a first object to be printed, a motor 66 and a divider 65 which are arranged below a conveying turntable 60 control the conveying turntable 60 to drive a jig to rotate anticlockwise by 90 degrees, then conveying is stopped, the first object to be printed reaches the position of the station P1, pretreatment operation is carried out on the first object to be printed, and the first object to be printed rotates around a rotation central shaft of the first object to be printed in the treatment process; after the first object to be printed finishes the pretreatment work, the motor 66 and the divider 65 control the transmission turntable 60 to continuously drive the jig to rotate 90 degrees anticlockwise, then the transmission is stopped, the first object to be printed reaches the position of the station P2, and the printing unit of the station performs the inkjet printing operation on the first object to be printed, and the specific operation process is as follows: the first object to be printed continuously rotates at a constant speed around the rotation central shaft of the first object to be printed, the printing trolley 1 moves from an initial position to a final position along the direction of the cross beam 2, namely the X axis, ink drops are ejected to form images and texts when the ink drops pass over the area to be printed of the first object to be printed, meanwhile, the images and texts to be printed can be subjected to pre-curing treatment in the printing process, a UV lamp curing device 7 is arranged below the object to be printed as shown in fig. 1 for processing, pre-curing lamps can be arranged at two sides of the printing trolley or beside each spray head for processing, after the printing trolley 1 passes through the first object to be printed once, the spray painting operation of the images and texts is completed, and the printing trolley 1 moves from the final position to the initial position along the direction of the cross beam 2, namely the X axis and waits for the next object to be printed to be transmitted to the initial position for printing; when the first object to be printed finishes the printing operation, the motor 66 and the divider 65 control the transmission turntable 60 to continuously drive the jig to rotate anticlockwise for 90 degrees, then the transmission is stopped, the first object to be printed reaches the position of the station P3, the station is provided with an ultraviolet curing lamp for completely curing the image and text sprayed on the station P3, and the first object to be printed rotates around the rotation central shaft thereof in the curing process; after the first object to be printed completes the final curing operation, the motor 66 and the divider 65 control the conveying turntable 60 to continuously drive the jig to rotate 90 degrees anticlockwise, then stop conveying, and the first object to be printed returns to the position of the station P4, where the operator performs blanking on the first object to be printed after finishing the printing process and installs a new object to be printed, which can be performed manually or automatically.
It should be noted that, the above only takes the first object to be printed as an example, when each jig reaches the station P4, the feeding/discharging operation is performed, the object to be printed is installed in each jig in the normal working process, and each job at different stations is performed simultaneously. Each object to be printed is fixedly installed at the upper and lower working positions P4 and then is intermittently and sequentially conveyed in a rotating manner, each work of the pretreatment working position P1, the printing working position P2 and the complete curing working position P3 is returned to the upper and lower working positions P4 for discharging, when the rotation reaches each working position, the conveying device 6 stops conveying, corresponding working equipment carries out corresponding work on the object on each jig, the conveying stopping time is determined by the time required by the working position with the longest working time in the four working positions, the time is usually determined by the working time of the printing working position, and the required printing time is different according to different patterns and resolutions of printed pictures and texts, so that the conveying stopping time is adjusted accordingly. The transfer speed of the transfer device 6 from the previous station to the next station is constant and is controlled at the maximum speed as fast as possible.
The arrangement of the printing units at the printing station is described in detail below. Fig. 3 shows a bottom view of the print carriage in this embodiment, in which the spray heads 12 are mounted on the bottom plate 11 of the print carriage 1 as shown, four spray heads are mounted in this embodiment, the spray heads 12 are sequentially connected in series along their length directions at intervals, that is, the connecting line direction of the four spray heads sequentially connected in series is parallel to the rotation center axis direction of the object to be printed, each spray head can print two colors, the first spray head on the left side is used for spraying white (W) ink, or can spray white ink according to actual needs, the middle two spray heads are used for spraying magenta (M), yellow (Y), cyan (C) and black (K) ink, and the right spray head is used as a standby spray head, which can be used for spraying transparent (V) ink, or can be used for spraying other color inks or not spraying ink. The spray head arrangement mode can finish the printing of the whole image and text after the printing trolley passes through the area to be printed once along the X axis in the process of uniformly rotating the object to be printed around the central axis of the spray head arrangement mode, and the printing efficiency is improved. An ink cartridge for containing ink and a corresponding negative pressure control system may be provided on the carriage 1. The ink used by the spray head of the application is UV ink. The application can also be provided with other numbers of spray heads, and the arrangement sequence of the inks with different colors can be determined according to actual requirements, and the application is not limited in particular.
According to the invention, objects with different diameters can be printed, before printing, the plane of the spray hole of the spray nozzle on the printing trolley 1 is required to be adjusted to reach the most suitable printing distance (usually 1-3 mm) from the upper surface of the object 4 to be printed according to the diameter size of the object to be printed, and the conveying device 6 and the jig can not be adjusted to be lifted, so that the printing trolley 1 is designed to be lifted and lowered. When the object 4 to be printed is first installed or replaced, a set of nozzle protection mechanism 9 which can be lifted along with the printing trolley 1 is needed to ensure that the bottom surface of the nozzle cannot be scratched by the object 4 to be printed. As shown in fig. 4-5, the nozzle protection mechanism 9 includes a second sensor 91, a second sensor reflecting end 92, a screw motor 93, a first limit switch 94, a second limit switch 95, a slider 96, a guide rail 97, and a sensor cover 98, where in this embodiment, the second sensor 91 is illustrated as a laser ranging sensor, but may be any other sensor, and the invention is not limited thereto. The second sensor 91 is mounted on a screw rod of the screw rod motor 93 through a bracket (not shown in the figure), the screw rod motor 93 can drive the second sensor 91 to move up and down along the vertical direction, namely the Z-axis direction, the lowest end of the lifting range is provided with the first limit switch 94 for limiting, the highest end of the lifting range is provided with the second limit switch 95 for limiting, the bracket connected with the second sensor 91 is also connected with a sliding block 96, the sliding block 96 moves along a guide rail 97, the guide rail 97 is arranged along the vertical direction, namely the Z-axis direction, a guiding function is achieved, a transmitting hole 99 is arranged on a sensor cover plate 98, the transmitting hole 99 is a vertically arranged long hole, a light beam 90 emitted by the transmitting end of the second sensor 91 can irradiate to a second sensor reflecting end 92 on the opposite side, and is received by a receiving end of the second sensor 91 after being reflected back, and the distance that the light beam reaches an obstacle (namely the second sensor reflecting end 92) is calculated according to the received time, if the distance is within a preset range, no object to be printed in the middle is proved, a spray head below the printing trolley is in a safe state, and can work normally; if the object to be printed is higher than the light beam 90, the laser reflection distance fed back by the second sensor 91 is not consistent with the set distance, and at this time, it is proved that the object to be printed is shielded in the middle, and measures for protecting the spray head from being bumped need to be taken immediately.
It should be noted that, the second sensor 91 may also be a common laser sensor, where the second sensor reflecting end 92 is configured to receive the light beam, and may be a receiving plate covering the lifting range of the light beam emitted by the second sensor emitting end 91, or may be a receiving device that lifts and lowers synchronously along with the lifting of the second sensor emitting end 91, which is not limited in this invention.
The working procedure of the head protection mechanism 9 is specifically described below: the first step, the print carriage 1 and the second sensor 91 rise to the highest position along the Z-axis direction, and in this embodiment, the plane height of the spray hole when the print carriage 1 is at the highest position will be a distance higher than the height of the light beam emitted when the second sensor 91 is at the highest position, which is denoted as h herein; secondly, conveying the object to be printed to a printing station P2, stopping conveying by the conveying device 6, controlling the second sensor 91 to vertically move downwards along the Z-axis direction by the control system, and controlling the second sensor 91 to stop moving after the emitted light beam 90 is blocked by the object to be printed 4 by the control system, wherein the downward moving distance of the second sensor 91 from the highest position is recorded as H; third, the control system controls the second sensor 91 to move upwards to a position beyond the upper surface of the object to be printed by a distance d/2, where d represents the distance (usually 1-3 mm) between the upper surface of the object to be printed and the plane of the nozzle hole of the nozzle, and d=1.4 mm can be adopted in this embodiment; in the fourth step, the control system controls the print carriage 1 to descend from the highest position along the Z-axis direction by h+h-d, that is, the spray head reaches the optimal printing position, in this embodiment, the distance between the plane of the spray nozzle orifice of the print carriage 1 and the upper surface of the object to be printed is 1.4mm, at this time, the light beam 90 emitted by the second sensor 91 is located at the middle position between the plane of the spray nozzle orifice and the upper surface of the object to be printed, and when the height of the object to be printed exceeds the height of the light beam 90, the movement of the print carriage is stopped, so as to play a role in avoiding the rubbing of the object to be printed against the spray head.
After the printing trolley 1 reaches the optimal initial printing position in the Z-axis direction, the printing trolley starts to move along the direction of the printing beam 2, namely the X-axis direction, towards the direction close to the object 4 to be printed and passes over the object 4 to be printed, when passing through the area to be printed of the object 4 to be printed, the software control system controls the spray heads to sequentially spray ink drops to form required images and texts, in the printing process, a motor arranged on the jig drives the object 4 to be printed to rotate at a constant speed around a rotating central shaft of the motor, and an encoder feedback signal on the jig finishes the printing operation after the printing trolley 1 passes through once. Then, the conveying device continuously rotates and conveys the object of each jig to the next station for operation. At this time, the print carriage 1 returns to the initial printing position along the beam direction and then rises along the Z-axis direction, when the next jig is conveyed to the printing station by the conveying device, if the new object to be printed has no size abnormality, the beam 90 cannot be touched, the nozzle protection mechanism 9 works normally, the print carriage 1 reaches the optimal printing position again, and the print job is performed on the new object to be printed below. Repeating the steps until all the objects to be printed in the batch are printed; it should be noted that, the print carriage 1 may also return to the initial print position along the beam direction, and no longer rise along the Z axis direction, and if the feedback time of the sensor allows, the risk of preventing the nozzle from being bumped may be achieved. The specific course of movement depends on the actual situation and the test and is not limited herein.
When the objects to be printed with different diameters are replaced, the second sensor 91 in the print carriage 1 and the nozzle protection mechanism 9 needs to rise to the highest position again, as described above, the upper surface position of the objects to be printed with the replaced diameters is found again, then the descent distance of the print carriage is obtained through the calculation of the same principle, and finally the print carriage is controlled to reach the proper printing height for printing operation.
In addition to the protection mechanism 9 of the spray head, which prevents the object to be printed from rubbing the spray head, another protection mechanism is provided for protecting spray holes of the spray head from solidifying when the UV lamp below the object to be printed irradiates in the printing process, and is recorded as the protection mechanism of the spray head from solidifying, the protection mechanism of the spray head from solidifying comprises a first sensor transmitting end 01 and a first sensor receiving end 02, as shown in fig. 4, the first sensor transmitting end 01 is positioned beside the UV lamp solidifying device 7, the first sensor transmitting end 01 transmits light beams upwards, the corresponding first sensor receiving end 02 is arranged above the printing beam 2 to receive the light beams transmitted by the first sensor receiving end 02, and the first sensor receiving end 02 is arranged on the top wall of the supporting frame 5 (as shown in fig. 1) of the printing device. The specific working principle is as follows: when the non-transparent object 4 to be printed is positioned between the first sensor transmitting end 01 and the first sensor receiving end 02 and the light beam emitted by the non-transparent object is shielded, a signal capable of working normally is fed back, and the control system controls the UV lamp to work normally and the printing operation to work normally; if the light beam between the first sensor transmitting end 01 and the first sensor receiving end 02 is not blocked, it indicates that the object to be printed does not reach the printing position or the object to be printed is transparent and is not subjected to light-proof treatment, and the UV lamp should not be turned on to irradiate the irradiation state at this time, so that the phenomenon that the ultraviolet light emitted by the UV lamp directly irradiates the nozzle hole of the spray head to cause dry and hard blockage of the nozzle hole is avoided.
In addition, a sensor is arranged on the lower support plate of the feeding and discharging station P4 on the conveying turntable 60, and a mark different from other jigs is arranged below one jig on the conveying turntable 60 to trigger the sensor, so that an object to be printed on which jig reaching the printing station can be calculated in a feedback manner.
After the feedback of each sensor is normal, normal printing work can be performed. Because the driving motor is independently arranged on each jig to drive the objects to be printed to rotate, the rotating speed of each object to be printed is different, and when the inkjet printing operation is carried out, software needs to know the specific rotating parameters of the objects to be printed which are currently positioned at the printing station, so that the accurate inking can be carried out in a targeted manner to ensure the inkjet printing quality. According to the invention, an independent encoder is arranged on each jig for feeding back a real-time rotation signal, a signal selection plate is designed to receive an enabling signal of an object to be printed on the jig reaching a printing station, and the rotation signal of the object to be printed fed back by the encoder is transmitted to a control plate, so that the object to be printed at the printing station is subjected to targeted inking control.
The signal selection plate is described in detail below. Fig. 6 is a schematic diagram of a signal selection board, and as shown, the signal switching board includes a first dual-layer connection terminal JP1, a second dual-layer connection terminal JP2, a signal selection terminal JP3, a first chip U20, a second chip U21, a third chip U22, a fourth chip U23, a single-ended rotation differential chip U30, a driving chip (not shown in the drawing), and an output terminal JP4. The first double-layer wiring terminal JP1 is connected with the first jig 61 and the second jig 62 and is used for receiving signals fed back by encoders on the first jig 61 and the second jig 62; the second double-layer connecting terminal JP2 is connected with the third jig 63 and the fourth jig 64 and is used for receiving signals fed back by encoders on the third jig 63 and the fourth jig 64; the signal selection end JP3 is respectively connected with the first jig 61, the second jig 62, the third jig 63 and the fourth jig 64, the jigs arrive at the printing station and send an enabling signal, and the signal selection end JP3 is used for receiving the enabling signal sent by which jig and transmitting the enabling signal to the chip of the corresponding jig; the first chip U20 is connected with the upper layer output end of the first double-layer wiring terminal JP1 and the signal selection end JP3, the second chip U21 is connected with the lower layer output end of the first double-layer wiring terminal JP1 and the signal selection end JP3, the third chip U22 is connected with the upper layer output end of the second double-layer wiring terminal JP2 and the signal selection end JP3, the fourth chip U23 is connected with the lower layer output end of the second double-layer wiring terminal JP2 and the signal selection end JP3, the first chip U20, the second chip U21, the third chip U22 and the fourth chip U23 are differential-to-single-ended chips, which jig transmitted by the corresponding double-layer wiring terminal is in a printing position is used for receiving an enabling signal of a single-end encoder feedback signal and a single-end encoder signal transmitted by the corresponding double-layer wiring terminal, the chip receiving the enabling signal converts the differential signal fed back by the encoder into a single-end signal, and continuously transmits the converted signal to the differential chip U30 and the driving chip, the single-end differential chip U30 receives an A term and a B term transmitted by the single-end encoder upper jig in the printing position and converts the single-end encoder signal into a single-end encoder driving signal, and the differential chip is used for enhancing the driving capability of the single-end encoder driving signal and the single-end driving device in the single-end driving position and the single-end driving device receiving jig is used for the single-end driving device; the signals converted and strengthened are output to the output terminal JP4, and the output terminal JP4 is an 8pin terminal and is used for being connected with a main board, so that the signals are transmitted to a nozzle main board to control the printer to work.
Besides, the circuit board is also provided with a switch power supply circuit, a filter circuit, an expansion circuit, a jumper wire selection power supply circuit, a matching electrical impedance interference circuit and the like.
The specific working process is as follows: taking the printing device with four stations as an example, four stations including a pretreatment station P1, a printing station P2, a complete curing station P3 and an upper and lower material stations P4 are preset, a first jig 61, a second jig 62, a third jig 63 and a fourth jig 64 which are uniformly arranged in a circumferential array are sequentially and intermittently rotated and transmitted through the four stations, each jig is provided with an independent driving motor and an encoder, the encoder feeds back a rotation signal, a trigger switch (a sensor) is arranged below the jig to feed back a signal of which jig reaches the printing station P2, the signal is recorded as an enabling signal, and the enabling signal is transmitted to a signal selection plate. Here, the third jig 63 reaches the printing station P2 as an example: the trigger switch (sensor) feeds back the third jig 63 to the position of the printing station P2 to be printed, the signal selection end JP3 receives an enabling signal which needs to be printed by the third jig 63, the upper layer of the second double-layer wiring terminal JP2 receives an encoder feedback signal on the third jig 63, the enabling signal and the encoder feedback signal are transmitted to the third chip U22, and after being processed by the single-ended differential chip U30 and [ LXH1], a signal which can be received by the circuit control board is transmitted to the output terminal JP4, and finally the output terminal JP4 is used for transmitting ink to the circuit control board to control a spray head.
Because each tool is provided with independent motor and encoder, the rotational speed of waiting to print the object on each tool will be different, through signal selection board, select and be in waiting to print the object rotation signal of printing that the station is ready to print to feed back its rotation signal in real time to the control board control inking and print, thereby ensure the print quality of waiting to print the object on this tool.
The conveying device is not limited to the number of the working stations and the jigs, and besides four jigs are arranged in a circumferential array mode around the rotation center axis in the embodiment, other jigs can be arranged, and the corresponding stations, namely the working procedures, are determined according to actual requirements.
Fig. 7 is a top view of a conveyor according to another embodiment of the present invention, in which twelve jigs are uniformly arranged on the conveyor 6 in a circumferential array manner, twelve objects to be printed are respectively placed, and twelve stations are correspondingly arranged around the conveyor 6 for completing all working processes, specifically: the first station S1, the second station S2, the third station S3, the fourth station S4, the fifth station S5, the sixth station S6, the seventh station S7, the eighth station S8, the ninth station S9, the tenth station S10, the eleventh station S11 and the twelfth station S12, wherein the third station S3 to the ninth station S9 are used as inkjet printing stations (seven stations can be all used or can reserve part of stations for standby, and the ink can comprise color ink and coating type ink such as white, transparent ink), and specific settings can be as follows: the first station S1 is used for a first-step pretreatment job before printing, the second station S2 is used for a second-step pretreatment job before printing (if no pretreatment job or only one-step pretreatment job is needed, the operation can be omitted), the third station S3 is used for printing ink of a first color, the fourth station S4 is used for printing ink of a second color, the fifth station S5 is used for printing ink of a third color, the sixth station S6 is used for printing ink of a fourth color, the seventh station S7 is used for printing ink of a fifth color, the eighth station S8 is used for printing ink of a sixth color, the ninth station S9 is used for printing ink of a seventh color, the tenth station S10 is used for performing a full-curing job, the eleventh station S11 is used for blanking job, and the twelfth station S12 is used for feeding job. The above is only one specific application of the device, and other modes of operation setting can be performed according to actual needs.
In terms of inking control of the twelve-station printing device, similar to the principle of the four-station printing device, independent driving motors and encoders are respectively installed on the jigs, the driving motors drive the objects to rotate around the central axes of the jigs, the encoders feed back the rotation information of the objects to be printed, a signal selection plate is still required to be arranged, as shown in fig. 8, the signal selection plate comprises signal receiving ends, signal selection ends, chips and signal output ends, the number of the receiving ports of the signal receiving ends is required to be greater than or equal to the set number of the jigs, each receiving port is respectively connected with the encoders installed on each jig and used for receiving signals sent by each encoder, according to which jig feeds back the enabling signals sent by each printing station to be sent by a trigger switch, the signal receiving end of the signal selection plate is used for receiving the enabling signals sent by each printing station, the signal receiving encoder feedback signals of the jigs on each printing station, the enabling signals and the encoder feedback signals of the corresponding jigs are respectively transmitted to the corresponding chips, the signal receiving signals are processed by the conversion chips and the driving chips, the signals are transmitted to the circuit to the control board for finally transmitting the signals to the ink jet heads to the objects to be printed at the lower positions, and the lower positions of the printing stations.
It should be noted that any modifications made to the embodiments according to the present invention do not depart from the spirit of the invention and the scope of the present invention as set forth in the appended claims.
Claims (9)
1. The signal selecting board for the ink-jet printer is characterized by comprising a signal receiving end, a signal selecting end, a chip and a signal output end, wherein the signal receiving end is connected with at least two jigs, a driving motor and an encoder are respectively arranged on each jig, the signal receiving end is used for receiving signals sent by the encoders arranged on the jigs, the signal selecting end is used for receiving enabling signals sent by the encoders on the printing stations, the enabling signals are used for feeding back which jig is in a printing position to prepare a printing operation, the chip receiving the enabling signals converts the received encoder signals and sends out the signals, finally, the converted signals are transmitted to the signal output end, the signal output end transmits the signals to a control board, the signal selecting board is used for controlling the printer to print, one double-layer wiring terminal is respectively connected with the two jigs, the single-ended differential chip and the driving chip is used for receiving signals fed back by the encoders on each jig, the single-ended differential chip is respectively connected with all jigs, the single-ended jigs can reach the printing stations to enable the receiving end, the chip is correspondingly connected with the chip to enable the receiving end, the signal selecting end is correspondingly connected with the chip to the chip, the signal selecting end can be transmitted to the chip, the signal selecting end can be correspondingly connected with the signal receiving end, the signal selecting end can be continuously connected with the chip, the signal selecting end can be transmitted to the signal selecting end, the signal selecting end can be connected with the signal selecting end, and the signal selecting end can be continuously transmitted to the signal layer, the signal selecting end can be connected with the signal, and the signal chip can be respectively, and the signal can be converted to the signal, and can be converted, and can be converted, respectively, and can, and, the single-ended to differential chip and the driving chip receive, convert and strengthen signals and finally transmit the signals to the signal output end.
2. The signal select panel of claim 1, wherein the chip that does not receive the enable signal does not transmit the encoder signal.
3. The signal select board of claim 1, wherein the chips comprise differential to single-ended chips, and the number of differential to single-ended chips is the same as the number of jigs.
4. The signal select board of claim 1, wherein the signal select board further comprises a switching power supply circuit, a filter circuit, an expansion circuit, a jumper select power supply circuit, and a matched electrical impedance interference circuit.
5. The signal selection panel according to claim 1, wherein the object to be printed mounted on the jig is a cylinder, a cone, or an object with a print area of a cylinder/cone, and the object to be printed is rotated at a constant speed around its central axis during printing, and the encoder is configured to receive the rotation signal.
6. A signal selecting method using the signal selecting plate for an ink jet printer according to claim 1, comprising the steps of:
the method comprises the steps that at least two jigs intermittently rotate to transmit an object to be printed to a printing station for printing operation, a jig trigger switch reaching the printing station sends out an enabling signal, and the enabling signal is used for feeding back which jig reaches the printing station;
the second step, the signal selection board receives the enabling signals fed back by the printing stations, and controls the chips of the corresponding stations in the signal selection board to be in an enabling state, a motor and an encoder for driving the object to be printed to rotate are respectively arranged on each jig, the chips in the enabling state convert and transmit signals sent by the encoders arranged on the jigs reaching the printing stations, and the converted signals are finally transmitted to the signal output end;
thirdly, the signal output end transmits the converted signal to the control board;
And fourthly, the control board controls the spray head to print the object to be printed in the jig on the printing station according to the received signal.
7. The signal selecting method as claimed in claim 6, wherein the jig is provided with an object to be printed which is a cylinder, a cone or an object with a printing area of a cylinder/cone, respectively, and the object to be printed rotates at a constant speed around its central axis during the printing process.
8. The signal selection method as claimed in claim 6, wherein the signal transmitted from the encoder in the second step is received by the signal receiving terminal of the signal selection board and then transmitted to the corresponding chip.
9. A signal selecting method using the signal selecting plate for an ink jet printer according to claim 1, comprising the steps of:
The method comprises the steps that a conveying device intermittently rotates to convey at least two objects to be printed, the objects to be printed are fixed in a jig, the conveying device rotates for one circle to at least set two printing stations, each printing station is provided with an independent printing unit, a jig trigger switch reaching the printing station sends out an enabling signal, and the enabling signal is used for feeding back which jig reaches which printing station;
The second step, the signal selection board receives the enabling signals fed back by each printing station, controls the corresponding chip in the signal selection board, which receives the enabling signals, to be in an enabling state, and the chip in the enabling state respectively converts and transmits the signals sent by the encoders mounted on the jigs reaching the printing stations, and the converted signals are finally transmitted to the signal output ends respectively;
Thirdly, the signal output end respectively transmits the converted signals to the control board; and fourthly, respectively controlling the spray heads on the printing units in the printing stations to print the objects to be printed in the jigs on the printing stations by the control board according to the received signals.
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