CN113905889B

CN113905889B - Ink-jet printer and one-pass ink-jet printing method

Info

Publication number: CN113905889B
Application number: CN201980096520.8A
Authority: CN
Inventors: 张原�; 张征宇
Original assignee: Beijing Meikeyi Digital Technology Development Co Ltd
Current assignee: Beijing Meikeyi Digital Technology Development Co Ltd
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2023-05-23
Anticipated expiration: 2039-06-14
Also published as: WO2020248221A1; CN113905889A

Abstract

An ink jet printer and a printing method thereof are used for printing objects with cylindrical or conical image-text areas to be printed, the printer comprises at least two groups of printing units which are arranged along a printing cross beam (5) in a first direction, each group of printing units is provided with at least one printing spray head (7), the printing spray heads in each group of printing units are arranged along the length direction of the printing spray heads, namely a second direction, a conveying device (1) is arranged below the printing spray heads, at least two objects (9) to be printed are arranged on the conveying device (1) side by side along the first direction and are fixed in a jig (2) on the conveying device (1) along the second direction, the upper surface of the fixed object (9) to be printed is parallel to the second direction, the printing spray heads (7) spray ink when the object (9) to be printed rotates and continuously passes through the lower parts of the printing units along the second direction, and the image-text is formed after the object to be printed passes through once. The printer has compact structure, low cost and high printing efficiency.

Description

Ink-jet printer and one-pass ink-jet printing method

Technical Field

The invention relates to an ink-jet printer and a one-pass ink-jet printing method, in particular to an ink-jet printer which can print cylinders, cones or print areas with high efficiency and is cylinder/cone, and a one-pass ink-jet printing method.

Background

The simplest method of the prior art for printing exquisite patterns and characters on curved surfaces is to print on a planar carrier, and combine the carrier with a target curved surface, which is time-consuming and laborious and cannot guarantee the final effect. Chinese patent CN94115805.5 discloses a pattern transfer printing method, in which a pattern is transferred on a curved surface of a molded article, silk floss paper is used as transfer paper, a pattern is printed with high-temperature sublimation gas-dyeing ink, the surface of the molded article is pretreated, including cleaning, priming paint, thermal hardening of the priming paint, upper induction resin and hardening, a layer of induction adhesive is coated on the transfer paper, and the transfer paper is adhered on the curved surface, and is re-dissolved and fully adhered with the induction resin, and the transfer paper is not pressurized by a die, and the pattern is transferred on the curved surface realistically by using high-temperature gasification sublimation reaction, so that the molded article has the characteristics of beauty, durability and difficult falling.

The patent 200510045534.7 proposes a device for printing pictures and texts on the surface of a candle, which comprises an ink-jet printing unit, wherein the printing unit comprises a printing support, a printing head is arranged on the printing support, the printing head can reciprocate linearly relative to the support, two mutually parallel rotating shafts are arranged below the ink-jet printing unit, at least one rotating shaft is connected with a driving device, and the driving device and the ink-jet printing unit are connected with a circuit board. The candles to be printed are placed on two parallel rotating shafts, and the driving force of the candles is insufficient in the rotating process because the device is not provided with a pressing mechanism. In the printing process, the rotating shaft drives the candle to rotate step by step, and ink drops sprayed out of the printing head in the reciprocating process are attached to the surface of the candle. The printing method has low printing speed and low printing efficiency.

Patent 201821191887.7 proposes a printing device of a plurality of cylinders, the device print the dolly and remove along the frame, set up multiunit print head on the print dolly, set up multiunit transmission shaft and place the cylinder and print the substrate, every group print head and every group transmission shaft one-to-one of its below. The jet hole setting direction of each group of printing heads is vertical to the moving direction of the cylinder, and belongs to a scanning printing mode, and by using the printing mode, a plurality of cylinders can be synchronously printed, so that the printing efficiency is improved, but the number of required spray heads is large; in addition, when the positioning strip 10 is worn, the printing accuracy is affected, and if the positioning strips 10 at different positions are worn to different degrees, the printing effect of each printing substrate 100 is inconsistent; the device can print only cylindrical bodies and cannot print conical objects.

Summary of The Invention

Technical problem

The prior art adopts the inkjet printing device on the surface of the cylinder, which has the advantages of low printing speed, low efficiency, complex structure, large occupied space and high cost, and the cylinder printing device and method which have simple structure, are compact and small and have high printing efficiency are necessary to design, and can be compatible with printing objects to be printed with a cone and the like in various shapes and external dimensions, and span a larger size, so as to adapt to wider personalized customization requirements.

Solution to the problem

Technical solution

Aiming at the problems existing in the prior art, the invention aims to provide an ink-jet printer and a one-pass ink-jet printing method which can ensure the printing precision, improve the utilization rate of a spray head, improve the printing efficiency, reduce the occupied space and reduce the manufacturing cost.

In order to achieve the above object, the present invention provides an inkjet printer for printing objects to be printed, wherein the objects to be printed are cylindrical/conical, and the inkjet printer is characterized in that at least two groups of printing units are arranged along a printing beam, i.e. in a first direction, the bottom surfaces of the at least two groups of printing units are in the same plane, each group of printing units is provided with at least one printing nozzle, the printing nozzles in each group of printing units are arranged along a second direction (the length direction of the printing units) perpendicular to the first direction, a conveying device is arranged below the printing nozzles, the conveying device conveys the objects to be printed along the second direction, the objects to be printed are fixed on a jig on the conveying device along the second direction, the upper surfaces of the objects to be printed are parallel to the second direction, at least two objects to be printed are arranged side by side along the first direction, the conveying device continuously conveys the objects to be printed along the second direction and passes below the printing units, when the objects to be printed continuously pass below the printing units, the objects to be printed form graphics after passing through the printing units, and the objects to be printed form graphics after passing through the printing units continuously, and the graphics after passing through the printing units.

In the above inkjet printer, the number of the printing units is the same as the number of the jigs, the number of the printing units is the same as the number of the objects to be printed installed on the conveying device, and the at least two objects to be printed synchronously rotate and are conveyed in the printing process.

In the above ink-jet printer, the graphics printed on the object to be printed may be the same or different.

In the above-mentioned inkjet printer, the at least two sets of printing units may be disposed on a print carriage; each group of printing units can be independently arranged on one printing trolley, and at least two printing trolleys are arranged along the first direction and can move along the first direction.

In the above-described inkjet printer, the head of each set of printing units may be provided with color ink and white/transparent/primer-based coating ink.

The invention provides a one-pass ink-jet printing method, which is characterized in that at least two groups of printing units are arranged along a printing beam, namely a first direction, the bottom surfaces of the at least two groups of printing units are parallel to the first direction and in the same plane, each group of printing units is provided with at least one printing nozzle, the printing nozzles in each group of printing units are arranged along a second direction (self length direction) perpendicular to the first direction, a conveying device is arranged below the printing nozzle, and a jig is arranged on the conveying device to mount at least two objects to be printed, and the method comprises the following steps:

the method comprises the steps of firstly, arranging objects to be printed on a jig, fixing the objects to be printed along a second direction, enabling the upper surface to be parallel to the second direction, and sequentially arranging at least two objects to be printed along the first direction;

the second step, the conveying device synchronously and continuously conveys at least two objects to be printed along the second direction at the same speed and passes below the printing unit;

thirdly, when the at least two objects to be printed pass under the at least two groups of printing units, the spray heads in the printing units synchronously spray ink, the objects to be printed respectively form images and texts after passing through for one time, and the objects to be printed rotate around the central shaft at a constant speed in the printing process;

and fourthly, after the printing of the at least two objects to be printed in the third step is finished, continuously and synchronously conveying the objects to be printed by the conveying device to carry out subsequent operation.

In the above-mentioned one-pass inkjet printing method, the printing process in the third step may further include simultaneously performing a curing operation on the object to be printed.

In the above-described one-pass inkjet printing method, the subsequent operation in the fourth step may include performing a full curing operation, a detection operation, or a discharging operation on the object to be printed.

In the above-mentioned one-pass inkjet printing method, the first step further includes adjusting the vertical distance between the upper surface of the object to be printed and the plane of the nozzle of the inkjet head to be the most suitable printing distance, typically 1-3 mm.

In the above-mentioned one-pass ink-jet printing method, the graphics formed by each printing unit in the third step may be the same or different; before formal printing, the system also comprises software calibration of ink-jet data for errors generated after mechanical installation of the spray heads, and the spray heads in each group of printing units spray ink drops according to the calibrated ink-jet data.

Advantageous effects of the invention

Advantageous effects

The beneficial effects of the design of the invention are as follows:

1. the printer designed by the invention has compact and ingenious structure, saves space and cost compared with an industrial assembly line type printing device, and is suitable for customers with high customization demands. And when a plurality of objects to be printed are printed at the same time, the images printed by each object to be printed can be the same or different, and the use is more flexible.

2. According to the invention, the objects to be printed synchronously rotate and print, so that the time is saved and the printing efficiency is improved. Meanwhile, an encoder is adopted to detect the rotation number of an object to be printed, a computer and a main board are adopted to control printing, and the control is simplified and the maintenance is convenient.

3. The plurality of groups of spray heads are arranged on the same plane, so that the spray heads can be maintained in a moisturizing way, the condition of inconvenient ink scraping and moisturizing caused by angles among the spray heads is avoided, and the design of the ink scraping maintenance device can prevent the spray heads for printing different colors of ink from generating cross color when scraping ink.

4. The invention has wider range of the objects to be printed, can be used for printing cylinders, cones, and can also be used for printing special-shaped objects with cylindrical or cone areas to be printed, such as printing wine bottles, cosmetic bottles and the like, and in addition, the spray painting quality of the objects to be printed with different sizes can be ensured.

5. The printer design of the invention can enable the object to be printed to form complete printing patterns after continuously passing through in one pass, thereby improving the working efficiency and simultaneously ensuring the printing effect.

Brief description of the drawings

Drawings

FIG. 1 is a schematic perspective view of an ink jet printer according to one embodiment of the present invention;

FIG. 2 is a front view of the ink jet printer of FIG. 1 with the front baffle 41 hidden;

FIG. 3 is a bottom view of a print carriage in one embodiment of the invention;

FIG. 4 is a schematic view of a wiping maintenance device corresponding to the print carriage of FIG. 3 according to the present invention;

FIG. 5 is a front view of an ink jet printer in another embodiment of the invention;

FIG. 6 is a schematic view of a fixture portion of a cone according to another embodiment of the present invention;

FIG. 7 is a flow chart of a method of inkjet printing according to one embodiment of the present invention;

FIG. 8 is a schematic perspective view of an ink jet printer according to still another embodiment of the present invention;

FIG. 9 is a flow chart of the operation of the ink jet printer of FIG. 8;

FIG. 10 is a schematic perspective view of an ink jet printer according to yet another embodiment of the present invention;

fig. 11 is a front view of fig. 10 in accordance with the present invention.

The serial numbers in the figures are specifically expressed as: the conveying device 1, the jig 2, the supporting seat 3, the housing portion 4, the cross beam 5, the carriage 6, the head 7, the maintenance device for wiping 8, the object to be printed 9, the encoder 21, the pressing member 22, the guide rail 23, the slider 24, the rear roof block 25, the leveling part 26, the front barrier 41, the first head 71, the second head 72, the third head 73, the fourth head 74, the fifth head 75, the sixth head 76, the first blade 81, the second blade 82, the third blade 83, the fourth blade 84, the fifth blade 85, the sixth blade 86, the ink receiving tray 87, the first object to be printed 91, the second object to be printed 92, the cone 93, the first jig 211, the second jig 212, the third jig 213, the a jig 214, the B jig 215, the first conveying device 11, the second conveying device 12, the third conveying device 13, the a conveying device 14, and the B conveying device 15.

Best mode for carrying out the invention

The invention is described in further detail below with reference to the drawings and the specific examples.

Example 1

Fig. 1 and 2 show a perspective view and a front view (front view after hiding the front shutter 41) of an inkjet printer in the present embodiment, respectively, and as shown in fig. 1 to 2, the inkjet printer in the present embodiment includes a conveying device 1, a jig 2, a supporting base 3, a housing portion 4, a cross member 5, and a carriage 6. The conveying device 1 is disposed above the supporting seat 3, the jig 2 is disposed above the conveying device 1 to mount the objects 9 to be printed, the two objects 9 to be printed can be arranged side by side along the X axis, i.e. the first direction, on the jig 2, in this embodiment, the two objects 9 to be printed are two cylinders, which are respectively defined as a first object 91 to be printed and a second object 92 to be printed, the objects 9 to be printed are disposed along the Y axis, i.e. the second direction, i.e. the central/upper surface of the fixed and installed cone is parallel to the Y axis, i.e. the second direction, when the objects to be printed are cones, the upper surface of the fixed and installed cone is parallel to the Y axis, i.e. the second direction, the first direction is perpendicular to the second direction, the first object 91 to be printed and the second object 92 to be printed are connected to the same motor (not shown in the figure), the motor can control the first object 91 to be printed and the second object 92 to be printed to synchronously rotate around the rotation central axis of the motor, respectively, i.e. the second object 92 to be printed can synchronously reciprocate and convey the objects 9 to be printed along the Y axis, i.e. the second direction. A cross beam 5 is arranged above the jig 2, the cross beam 5 is arranged along an X axis, i.e. in a first direction, a printing trolley 6 is arranged on the cross beam 5, two groups of nozzle printing units are arranged on the printing trolley 6 in the embodiment, the two groups of nozzle printing units are arranged in the same plane side by side along the X axis, i.e. in the first direction, each group of nozzle printing units is arranged below and corresponds to an object to be printed and is used for printing the corresponding object to be printed, each group of nozzle printing units is provided with nozzles 7 (when each group of nozzle printing units is provided with only one printing nozzle, the nozzles are arranged along the length direction of the nozzle) which are sequentially connected in series along a Y axis, i.e. in the second direction (the length direction of the nozzle), and in theory, the ink drop track downwards ejected by the nozzle orifice of each group of nozzle printing units passes through or approaches to the radial direction of the object to be printed corresponding to the lower. As can be seen from the bottom view of the print carriage shown in fig. 3, in this embodiment, each group of nozzle printing units is sequentially connected in series with three nozzles along the Y axis, that is, the second direction, and the first nozzle printing unit is sequentially connected in series with a first nozzle 71, a second nozzle 72, and a third nozzle 73, where the first nozzle 71, the second nozzle 72, and the third nozzle 73 are used to perform image-text printing on a first object 91 to be printed below; the second nozzle printing unit is sequentially connected in series with a fourth nozzle 74, a fifth nozzle 75 and a sixth nozzle 76, and the fourth nozzle 74, the fifth nozzle 75 and the sixth nozzle 76 are used for performing image-text printing on a second object 92 to be printed below. Each set of nozzle printing units can be used for printing color ink (cyan ink C, magenta ink M, yellow ink Y, black ink K, light cyan ink LC, light magenta ink LM or other spot color ink) or coating ink (white ink W, transparent ink V or primer ink P and the like), each nozzle can be used for spraying ink with one or more colors, the actual printing color condition is determined according to the requirement, and the invention is not limited by the number of the colors of the printing ink of each nozzle and the arrangement mode of the inks with different colors. One end of the cross beam 5 is provided with an ink scraping maintenance device 8 (blocked by the housing part 4), the specific structure of the ink scraping maintenance device 8 is shown in fig. 4, two groups of ink scraping units are arranged corresponding to two groups of nozzle printing units, the two groups of ink scraping units are arranged side by side along the X axis, namely the first direction, the first group of ink scraping units comprises a first scraping blade 81, a second scraping blade 82 and a third scraping blade 83 which are sequentially connected in series along the Y axis, namely the second direction, and the first scraping blade 81, the second scraping blade 82 and the third scraping blade 83 are used for scraping ink of the first nozzle printing units, and specifically: when the carriage passes through the wiping maintenance device 8 in the first direction along the X axis, the first wiper 81 wipes the first head 71, the second wiper 82 wipes the second head 72, and the third wiper 83 wipes the third head 73; the second group of ink scraping units comprises a fourth scraping blade 84, a fifth scraping blade 85 and a sixth scraping blade 86 which are sequentially connected in series along the Y axis, namely in the second direction, wherein the fourth scraping blade 84, the fifth scraping blade 85 and the sixth scraping blade 86 are used for scraping ink of the second nozzle printing unit, and specifically: when the carriage passes through the wiping maintenance device 8 in the first direction along the X axis, the fourth blade 84 wipes the fourth head 74, the fifth blade 85 wipes the fifth head 75, and the sixth blade 86 wipes the sixth head 76. In addition, the wiping maintenance device 8 can still perform wiping maintenance operation in the case where one or two heads are provided for each set of head printing units; when each group of nozzle printing units is connected with four or more nozzles in series, each group of ink scraping units is also provided with the same number of scraping blades, and the principle is the same. When the wiper has wiped the nozzle holes, the waste ink flows into the ink receiving plate 87 and is discharged. The design of the ink scraping maintenance device 8 can be matched with two groups of nozzle printing units in the same plane, so that the nozzles can be rapidly scraped (the ink scraping movement range of the nozzles is reduced), and the nozzles for printing different colors of ink can be prevented from being cross-colored. When the printing is completed and the spray head needs to be moisturized, the printing trolley 6 moves to the upper part of the ink scraping maintenance device 8 along the X axis, namely the first direction, the ink scraping maintenance device 8 is driven to lift along the Z axis, namely the vertical direction, and the spray head can be moisturized and maintained by the buckle cover on the bottom plate of the spray head so as to prevent the spray hole of the spray head from being dry and blocked, and at the moment, the scraping blade is arranged in a groove (not shown in the figure) on the left side of the spray head. The printer is externally wrapped by the housing portion 4 to facilitate the aesthetic appearance of the machine.

Example two

Fig. 5 is a front view of an inkjet printer according to another embodiment of the present invention, in which three sets of nozzle print units are disposed on a print carriage 6, each set of nozzle print units is disposed side by side along an X axis, that is, a first direction, and disposed in the same plane, at least one nozzle is disposed in each set of nozzle print units, and when two or more nozzle print units are disposed in each set of nozzle print units, the nozzles are sequentially arranged in series along the Y axis, that is, a second direction (self length direction). Three objects 9 (cylinders) to be printed are respectively fixed on the conveying device 1 under the corresponding spray head printing units, the rotation central axes of the three objects 9 (cylinders) to be printed are parallel to the Y axis, namely the second direction, the three objects 9 to be printed are arranged side by side along the X axis, namely the first direction, and in theory, the ink drop tracks sprayed downwards by spray head spray holes of the spray head printing units of each group pass through or are close to the radial directions of the objects to be printed corresponding to the lower parts. Other structural designs, movement control modes and wiping maintenance modes of the printer are the same as those of the first embodiment, and are not repeated here.

Example III

Fig. 6 is a schematic view of a fixture 2 for fixing a cone according to another embodiment of the present invention, where the fixture 2 includes an encoder 21, a tightening member 22, a guide rail 23, a slider 24, a tail jack 25, a leveling part 26, and a supporting member. The bottom support plate of the jig 2 is provided with a guide rail 23 along the Y axis, namely in the second direction, the sliding block 24 is matched with the guide rail 23 to slide along the guide rail, namely in the second direction, the sliding block 24 is connected with the propping part 22 above, so that the propping part 22 can be driven to slide along the second direction, the tail propping block 25 on the propping part 22 is controlled to prop against the bottom of an object to be printed (the cone 93) and tightly prop against the bottom, the object to be printed is fixed on the opposite side of the propping part 22 along the Y axis, namely in the second direction, a driving motor (not shown in the figure) and an encoder 21 are arranged, the driving motor is used for driving the two cones 93 to be printed to synchronously rotate around the central axis of the driving motor, the encoder 21 is used for recording the rotation number or angle of the two cones 93 to be printed and feeding back information to the control system to control the inking printing of the object to be printed, and a parallel adjusting part 26 is also arranged below the jig, and the parallel adjusting part 26 is used for adjusting the upper surface of the side wall of the cone 93 arranged above the object to be parallel to the plane of the spray nozzle, namely parallel to the Y axis, namely in the second direction. When printing the cone, software is also required to calculate the corresponding ink data with different densities at different diameters. The difference from the printer of the first embodiment is that the first embodiment is provided with two cylinders of the same size, while the present embodiment is provided with two cones 93 of the same size, and the other printer arrangement principles are the same.

In summary, the present invention is not limited to the above three embodiments, and one or more of the nozzle printing units may be provided, where the number of nozzle printing units is consistent with the number of objects to be printed on the lower conveying device. In addition, besides the embodiment that one print trolley is arranged and a plurality of groups of spray head printing units are arranged on the print trolley, a plurality of print trolleys can be arranged, the positions of the print trolleys on the cross beam can be independently adjusted along the X axis, namely the first direction, and meanwhile, the positions of the objects to be printed corresponding to the lower parts can be adjusted along the X axis, namely the first direction, so that the track of ink drops downwards sprayed by spray head spray holes of the spray head printing units on each print trolley can be ensured to pass through or be close to the radial direction of the objects to be printed corresponding to the lower parts through adjustment of the two print trolleys.

In the above embodiment, the object to be printed may be a cylinder or a cone, or may be a special object with a cylindrical or cone printing area, such as a wine bottle, a cosmetic bottle, etc., which is matched with different jigs, and the external dimension of the object to be printed may be changed, so that good spray painting quality may be ensured.

In addition, the number of the spray heads arranged in each group of printing units is not limited, in the first embodiment, each group of spray head printing units is sequentially connected with three spray heads in series along the Y axis, namely the second direction, and only one spray head can be arranged or two/four/multiple spray heads can be sequentially connected with each other in series, so that the ink jet is designed, installed and controlled according to actual printing requirements.

The printer in the above embodiments is implemented by, as shown in fig. 7, firstly, placing objects to be printed in a jig 2, placing at least two objects to be printed side by side along an X axis, that is, a first direction, placing the objects to be printed along a Y axis, and adjusting a distance between an upper surface of the objects to be printed and a surface of a nozzle hole of a nozzle on a print carriage to be a most suitable distance for printing, typically 1-3 mm, wherein the upper surface of the objects to be printed is parallel to the Y axis, that is, a second direction; then a start button is started, the conveying device 1 drives at least two objects to be printed placed on the jig 2 to synchronously convey along a Y axis, namely a second direction, and the conveying process is continuous and has no stop; when the object to be printed passes below the printing units, the nozzles in each group of printing units sequentially jet ink to the object to be printed, which enters the printing area correspondingly below, so as to form images and texts, the images and texts on the objects to be printed are synchronously formed, as in the printer in the first embodiment, the first nozzle 71, the second nozzle 72 and the third nozzle 73 which are connected in series in the first nozzle printing unit sequentially jet ink to the area to be printed of the first object to be printed 91 which is transmitted below, and meanwhile, the fourth nozzle 74, the fifth nozzle 75 and the sixth nozzle 76 which are connected in series in the second nozzle printing unit sequentially jet ink to the area to be printed of the second object to be printed 92 which is transmitted below, and in the printing process, the first object to be printed 91 and the second object to be printed 92 rotate around the central axis at the same speed, and when the image and texts to be printed continuously pass through the printing trolley once, the required printing is completed. In this printing process, the ejected ink droplets may be subjected to a pre-curing process or a direct full-curing process, depending on the specific conditions such as image requirements, ink characteristics, etc. (the present invention is not limited thereto in detail); when the printing of each object to be printed is completed, the object to be printed can be subjected to subsequent complete curing operation or image spray painting quality detection operation (specific operation process is carried out according to actual needs), and when the required operation is completed, the conveying device 1 reversely conveys each object to be printed to an initial loading position along the Y axis, namely the second direction, and an operator carries out unloading operation on the object to be printed. Then judging whether an object to be printed needs to be printed or not, if yes, carrying out the steps again to feed, print and follow-up operation on the new object to be printed; if the ink is not supplied to the printing device, the whole printing is completed, the spray head of the printing trolley can be subjected to moisturizing maintenance operation, at the moment, the printing trolley moves to one side of the cross beam along the X axis, namely the first direction, and the lower ink scraping maintenance device is covered on the spray head in a buckling mode to keep the spray head moist, so that the spray hole is prevented from being dry and blocked.

Note that the graphics printed on the respective objects to be printed (the first object to be printed 91 and the second object to be printed 92) may be the same or different. Because of the mechanical manufacturing error of the base plate for installing the spray heads or the error generated when the spray heads are installed, the arrangement of the spray heads in each group of spray head printing units is not completely consistent, before formal printing, test printing is required to be carried out on objects to be printed at all positions respectively, software carries out error calibration on inking data of each group of spray head printing units according to test results, and then the calibrated data is used for controlling the printing operation of the spray heads.

When one (or more) motors are used for synchronously controlling two or more objects to be printed to synchronously rotate, the same encoder is used for feeding back the rotating angle information of at least two objects to be printed, a computer and a main board are used for controlling printing, two spray head control boards are arranged, and each spray head control board receives data issued by the main board and respectively controls different spray heads to spray ink drops.

Example IV

Fig. 8 shows a perspective view of an inkjet printer according to another embodiment, which includes a first jig 211, a second jig 212, a third jig 213, a first conveyor 11, a second conveyor 12, a third conveyor 13, a support base 3, a housing portion 4, a cross member, and a carriage (which has been blocked by the housing portion 4 in the figure). The first conveying device 11, the second conveying device 12 and the third conveying device 13 are arranged above the supporting seat 3 side by side along the X axis, namely the first direction, a first jig 211 is arranged above the first conveying device 11 and used for installing two objects to be printed, a second jig 212 is arranged above the second conveying device 12 and used for installing two objects to be printed, a third jig 213 is arranged above the third conveying device 13 and used for installing two objects to be printed, the two objects to be printed on each jig are arranged side by side along the X axis, namely the first direction, each object 9 to be printed is installed and fixed along the Y axis, namely the second direction, the first direction is perpendicular to the second direction, the rotation center axis of each object 9 to be printed before printing is parallel to the Y axis, namely the second direction (if the object to be printed is a cone, the upper surface of the cone is parallel to the Y axis, namely the second direction), each conveying device can reciprocate to convey the object to be printed on the cone along the Y axis, namely the second direction, and the objects to be printed can synchronously rotate around the center axis under the driving of a motor; a beam is arranged above the jig, the beam is arranged along an X axis, i.e. in a first direction, a print trolley is mounted on the beam, the print trolley can move back and forth along the X axis, i.e. in the first direction, two groups of spray head printing units are arranged on the print trolley, the two groups of spray head printing units are arranged side by side along the X axis, i.e. in the first direction, each group of spray head printing units respectively correspond to an object to be printed in the print jig, spray heads which are sequentially and serially arranged along a Y axis, i.e. in a second direction, are arranged on each group of spray head printing units (when only one spray head needs to be mounted, the spray heads are arranged along the length direction of the spray heads), in theory, the spray head spray holes of each group of spray head printing units spray downwards along or near the radial direction of the corresponding object to be printed below, referring to the bottom view of the print trolley as shown in fig. 3, and each group of spray head printing units are sequentially and serially arranged along the Y axis, i.e. in the second direction, three spray heads are sequentially arranged: the first group of spray head printing units are sequentially connected with the first spray head 71, the second spray head 72 and the third spray head 73 in series, the first spray head 71, the second spray head 72 and the third spray head 73 are used for performing image-text printing on an object to be printed on the left side of the lower jig, the second group of spray head printing units are sequentially connected with the fourth spray head 74, the fifth spray head 75 and the sixth spray head 76 in series, and the fourth spray head 74, the fifth spray head 75 and the sixth spray head 76 are used for performing image-text printing on the object to be printed on the right side of the lower jig. Each group of nozzle printing units can be provided with one, two, three or more nozzles, and color ink (cyan ink C, magenta ink M, yellow ink Y, black ink K, light cyan ink LC, light magenta ink LM or other spot color ink) or coating ink (white ink W, transparent ink V or primer ink P) can be printed in each group of nozzle printing units, and each nozzle can spray one color or multiple colors. One end of the cross beam is provided with an ink scraping maintenance device (not shown in the figure), the specific structure of the ink scraping maintenance device is shown in fig. 4, two groups of ink scraping units are arranged corresponding to two groups of nozzle printing units, the first group of ink scraping units scrape ink corresponding to the first group of nozzle printing units, and the second group of ink scraping units scrape ink corresponding to the second group of nozzle printing units. When the printing is completed and the spray head needs to be moisturized, the printing trolley is moved above the ink scraping maintenance device along the X axis, namely the first direction, the ink scraping maintenance device is driven to lift along the Z axis, namely the vertical direction, the spray head can be moisturized and maintained by the buckle cover on the bottom plate of the spray head, and the spray hole of the spray head is prevented from being blocked due to dry knot, and the working mode and the principle are the same as those of the first embodiment.

In the actual working process, the operator is located in front of the printer, and because the printing device has a compact structure, one operator can respectively perform loading and unloading operations on the three positions of the first jig 211, the second jig 212 and the third jig 213. The following illustrates an example of operation, the workflow is shown in fig. 9, but is not limited to only this manner of operation: the operator installs two objects to be printed on the second jig 212 first; after the installation is finished, the second conveying device 12 continuously conveys the two objects to be printed along the Y axis, namely the second direction, the two objects to be printed pass through the lower part of the printing cross beam, the motor controls the two objects to be printed on the second conveying device to synchronously rotate around the central axis of the second conveying device, meanwhile, the control system controls the printing trolley to move to the upper part of the second conveying device 12 along the cross beam, namely the first direction, when the two objects to be printed on the second conveying device 12 continuously pass through the lower part of the printing trolley, the spray head prints the two objects to be printed, after the printing of pictures and texts is finished after one pass, and in the process of conveying and printing by the second jig 212, an operator installs the other two objects to be printed on the first jig 211; when the print carriage finishes the print operation on the two objects to be printed on the second jig 212, the two objects to be printed are moved to the upper part of the first conveying device 11 along the beam, namely, the first conveying device 11 continuously conveys the two objects to be printed along the Y axis, namely, the second direction, the motor controls the two objects to be printed on the first conveying device 11 to synchronously rotate around the central axis of the motor, when the two objects to be printed on the first conveying device 11 continuously pass under the print carriage, the spray head prints the two objects to be printed, the printing of pictures and texts is finished after the two objects pass through once, meanwhile, the printed objects on the second jig 212 are completely cured (conveyed back to the initial feeding position after the curing is finished), and meanwhile, an operator continuously installs the two objects to be printed on the third jig 213; when the print carriage finishes the print operation of the two objects to be printed on the first jig 211, the two objects to be printed are moved to the upper part of the third conveying device 13 along the beam, namely the first direction, the third conveying device 13 continuously conveys the two objects to be printed along the Y axis, namely the second direction, the motor controls the two objects to be printed on the third conveying device to synchronously rotate around the central axis of the motor, when the two objects to be printed on the third conveying device 13 continuously pass under the print carriage, the spray head prints the two objects to be printed, the printing of pictures and texts is finished after the two objects to be printed pass through once, meanwhile, the printed objects on the first jig 211 are completely cured (conveyed back to the initial feeding position after the curing is finished), and meanwhile, an operator removes the two objects to be printed after the printing and the curing are finished on the second jig 212 conveyed back to the initial position and installs new objects to be printed; when the print carriage finishes the print operation of the two objects to be printed on the third jig 213 and then moves to the upper part of the second conveying device 12 along the beam, namely the first direction, the second conveying device 12 continuously conveys the two objects to be printed along the Y axis, namely the second direction, the motor controls the two objects to be printed on the second conveying device to synchronously rotate around the central axis of the motor, when the two objects to be printed on the second conveying device 12 continuously pass under the print carriage, the spray head prints the two objects to be printed, the printing of pictures and texts is finished after the two objects to be printed pass through once, meanwhile, the printed objects on the third jig 213 are completely cured (conveyed back to the initial feeding position after the curing is finished), and meanwhile, an operator removes the two objects to be printed after the printing and curing on the first jig 211 conveyed back to the initial position and installs the new objects to be printed; when the print carriage finishes the print operation on the two objects to be printed on the second jig 212, the two objects to be printed are moved above the first conveying device 11 along the beam, namely, the first conveying device 11 continuously conveys the two objects to be printed along the Y axis, namely, the second direction, the motor controls the two objects to be printed on the first conveying device to synchronously rotate around the central axis of the first conveying device, when the two objects to be printed on the first conveying device 11 continuously pass under the print carriage, the spray head prints the two objects to be printed, the printing of pictures and texts is finished after the two objects to be printed pass through once, meanwhile, the printed objects on the second jig 212 are completely cured (conveyed back to the initial feeding position after the curing is finished), and meanwhile, an operator removes the two objects to be printed which are finished to be printed and cured on the third jig 213 conveyed back to the initial position and installs a new object to be printed; when the print carriage finishes the print operation of the two objects to be printed on the first jig 211, the two objects to be printed are moved to the upper part of the third conveying device 13 along the beam, namely the first direction, the third conveying device 13 continuously conveys the two objects to be printed along the Y axis, namely the second direction, the motor controls the two objects to be printed on the third conveying device to synchronously rotate around the central axis of the motor, when the two objects to be printed on the third conveying device 13 continuously pass under the print carriage, the spray head prints the two objects to be printed, the printing of pictures and texts is finished after the two objects to be printed pass through once, meanwhile, the printed objects on the first jig 211 are completely cured (conveyed back to the initial feeding position after the curing is finished), and meanwhile, an operator removes the two objects to be printed after the printing and the curing are finished on the second jig 212 conveyed back to the initial position and installs new objects to be printed; .. the cycle is repeated until all the processes are waited for after it is determined that there is no object to be printed.

The operator carries out material loading, unloading operation respectively on each tool, the print dolly is moved to each conveyer top in proper order and is carried out one time print operation to the object that waits that the lower edge continuously passed through, because still need carry out the curing operation after the picture and text is accomplished, curing operation time is longer (for example, when spraying transparent ink and making the print image have the light effect, just need long-time solidification, the visual effect of long-time solidification is better than the visual effect of short-time solidification far away), in order to make the print dolly fully work not waste time (i.e. print dolly continuously works, do not wait for in situ), just set up three tool positions and correspond three conveyer, thereby can guarantee that the object that waits that has certain tool position all the time has ready to print, and then improve printer work efficiency.

It should be noted that, in the above embodiment, the feeding and discharging of the object to be printed are performed manually by an operator, and may also be achieved through automation.

The above is just a specific example, in actual operation, the order of placing the object to be printed on the first jig 211, the second jig 212 and the third jig 213 by the operator at the beginning may be arbitrarily interchanged, and the principle is unchanged.

Before printing color image, pre-processing operation (such as spraying primer ink) can be included in addition to feeding operation, after printing, other operations such as printing quality detection can be performed, and the operations are synchronously staggered according to the principle, so that the protection scope of the invention is not deviated, and in the printing process, UV curing operation can be performed while printing images and texts.

Example five

Fig. 10-11 illustrate yet another embodiment of the present invention, which differs from the fourth embodiment in that: the printer of this embodiment includes two jigs: the setting mode and the structure principle of the jig A214 and the jig B215 are the same as those of the above-mentioned embodiment, and the details are not repeated here. A cross beam 5 is arranged above the jig, the cross beam 5 is arranged along the X axis, namely in the first direction, a printing trolley 6 is arranged on the cross beam 5, the printing trolley 6 can move back and forth along the X axis, namely in the first direction, an ink scraping maintenance device is arranged at one end of the cross beam 5 and is shielded by the machine shell part 4, and the arrangement of the spray heads on the printing trolley 6, the printing mode, the structure and the working principle of the ink scraping maintenance device are the same as those described in the fourth embodiment.

In the actual working process, an operator is located in front of the printer, firstly installs two objects to be printed on the B jig 215, then presses a start button of the station, the B conveying device 15 continuously conveys the B jig 215 and the two objects to be printed installed on the B jig along the Y axis, namely the second direction, the two objects to be printed on the B jig are controlled by the motor to synchronously rotate around the central axis of the motor, meanwhile, the printing trolley 6 is controlled to move to the corresponding upper position of the B conveying device 15 along the beam 5, as shown in fig. 10, when the two objects to be printed on the B jig 215 continuously pass through the lower part of the printing trolley 6, the spray heads on the printing trolley 6 synchronously print the lower two objects to be printed, the printing of the pictures and texts is completed after one pass through, the curing treatment can be carried out at the same time of printing, the curing treatment can be independently carried out on the objects after the printing is completed, and the two objects to be printed are conveyed back to the initial position of the feeding along the reverse direction of the Y axis. After the two objects to be printed are installed on the B jig 215 by an operator, the other two objects to be printed are continuously installed on the A jig 214 by the operator in the process of conveying and printing the objects, when the printing trolley 6 finishes the printing operation of the two objects to be printed on the B jig 215, the objects to be printed are moved to the upper part of the A conveying device 14 along the cross beam 5, the two objects to be printed are continuously conveyed along the Y axis, namely the second direction by the A conveying device 14, the two objects to be printed on the A conveying device are synchronously rotated around the central axis by a motor, when the two objects to be printed on the A conveying device 14 continuously pass through the lower part of the printing trolley, the spray head prints the two objects to be printed, the printing of pictures and texts is finished after the printing operation is finished once, the curing treatment can be carried out at the same time, the curing treatment can be independently carried out after the printing operation is finished, and the two objects to be printed are conveyed back to the initial position of feeding along the reverse direction of the Y axis after the curing operation is finished. After the B jig 215 is returned to the initial position, the operator removes the object after the printing and curing is completed and then installs another two new objects to be printed, and the two new objects to be printed on the B jig 215 are again transferred, printed and cured in the above process, and likewise, after the a jig 214 is returned to the initial position, the operator removes the object after the printing and curing is completed and then installs another two new objects to be printed, and the two new objects to be printed on the a jig 214 are again transferred, printed and cured in the above process.

Each jig in the fourth embodiment and the fifth embodiment is provided with two objects to be printed, and may be designed as a jig for mounting one object to be printed or more objects to be printed, which is not particularly limited in the present invention.

In the practical application process, the number of the conveying devices and the corresponding jigs is specifically required to be set, the time of the printing operation and the time of the non-printing operation are related, the final purpose is to enable the printing trolley to be in an ideal state of the printing operation as continuously as possible without wasting time cost, and the general formula is summarized as follows: setting the number N of the conveying devices to be more than or equal to (T non-printing/T printing) +1, wherein the number N of the conveying devices is the smallest integer which meets the formula, T printing represents the printing operation time of the jet head for jetting ink, T non-printing represents the processing time of an object to be printed except the jet head for jetting ink, the processing time comprises the processing time before printing and the processing time after printing, and the processing time before printing comprises the feeding time of the object to be printed, the preprocessing time of the object to be printed, the conveying time of the object to be printed and the like; the processing time after printing comprises the complete curing time, the image-text detection time, the blanking time and the like of the image-text on the object to be printed. In addition to the two conveying devices or the three conveying devices in the above embodiments, a greater number of conveying devices may be provided according to practical situations, which is not particularly limited in the present invention.

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

1. An ink jet printer is used for printing a cylinder/cone or an object to be printed, wherein the image-text area to be printed is a cylinder/cone, at least two groups of printing units are arranged along a printing beam, namely a first direction, the bottom surfaces of the at least two groups of printing units are in the same plane, each group of printing units is provided with at least one printing spray head, the printing spray heads in each group of printing units are arranged along a second direction perpendicular to the first direction, namely the length direction of the printing spray heads, a conveying device is arranged below the printing spray heads, the conveying device conveys the object to be printed along the second direction, the object to be printed is fixed on a jig on the conveying device along the second direction, the upper surface of the fixed object to be printed is parallel to the second direction, at least two objects to be printed are arranged side by side along the first direction, the conveying device continuously conveys the object to be printed along the second direction and passes through the lower parts of the printing units, the spray heads spray ink when the object to be printed continuously passes through the lower parts of the printing units, the object to be printed forms images and texts after the object to be printed passes through the printing units once, and the object to be printed is rotated around a central shaft at a uniform speed in the printing process.

2. The inkjet printer according to claim 1, wherein the number of the printing units is the same as the number of the objects to be printed mounted on the conveying means, and the at least two objects to be printed are rotated and conveyed in synchronization during printing.

3. An ink jet printer according to claim 1, wherein the graphics printed on the object to be printed may be the same or different.

4. The inkjet printer of claim 1 wherein the at least two sets of printing units are disposed on a print carriage; each group of printing units can be independently arranged on one printing trolley, and at least two printing trolleys are arranged along the first direction and can move along the first direction.

5. The ink jet printer of claim 1 wherein the nozzles of each set of printing elements are capable of providing color ink and white/clear/primer based coating ink.

6. The one-pass ink jet printing method is characterized in that at least two groups of printing units are arranged along a first direction which is a printing beam, the bottom surfaces of the at least two groups of printing units are parallel to the first direction and are in the same plane, each group of printing units is provided with at least one printing spray head, the printing spray heads in each group of printing units are arranged along a second direction which is perpendicular to the first direction, namely the length direction of the printing spray heads, a conveying device is arranged below the printing spray heads, and a jig is arranged on the conveying device to mount at least two objects to be printed, and the one-pass ink jet printing method comprises the following steps:

7. The one-pass inkjet printing method according to claim 6 wherein the printing process in the third step further includes simultaneously curing the object to be printed.

8. The one-pass inkjet printing method according to claim 6 wherein the subsequent operations in the fourth step may include performing a full cure job, a check job, or a discharge job on the object to be printed.

9. The one-pass inkjet printing method according to claim 6 wherein the first step further includes adjusting the vertical distance between the upper surface of the object to be printed and the plane of the nozzle of the inkjet head to the most suitable printing distance, typically 1-3 mm.

10. The one-pass ink-jet printing method as claimed in claim 6, wherein the image-text formed by each printing unit in the third step may be the same or different; before formal printing, the system also comprises software calibration of ink-jet data for errors generated after mechanical installation of the spray heads, and the spray heads in each group of printing units spray ink drops according to the calibrated ink-jet data.