WO2015123884A1

WO2015123884A1 - Ink-jet printing device and printing method

Info

Publication number: WO2015123884A1
Application number: PCT/CN2014/072456
Authority: WO
Inventors: 张原�
Original assignee: 北京美科艺数码科技发展有限公司; 张原�
Priority date: 2014-02-24
Filing date: 2014-02-24
Publication date: 2015-08-27
Also published as: CN106029387A

Abstract

An ink-jet printing device, comprising: a feeding part (02) for loading and moving an object to be printed (4); a printing part (01) for positioning and driving a printing carriage (2) with at least one print head (21a, 21b, 21c, 21d) installed; a control system for controlling the operation of the print heads (21a, 21b, 21c, 21d) and the movement of the printing carriage (2) and the object to be printed (4); the printing carriage (2) is disposed directly above the central shaft of the object to be printed (4); the control system controls the stepping motion of the printing carriage (2) along the central shaft direction of the object to be printed (4), and controls the feeding part (02) to move the object to be printed (4) to rotate around the center shaft thereof. The ink-jet printing device has a simple structure and high printing efficiency, and can print objects to be printed (4) with different diameters by adjusting the distance between the printing carriage (2) and the object to be printed (4), and can be used for monochrome printing or color printing by setting the number of the print heads (21a, 21b, 21c, 21d) on the printing carriage (2) in the ink-jet printing device.

Description

Inkjet printing device and printing method

技术领域Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an ink jet printing apparatus, and more particularly to an ink jet printing apparatus and a printing method for performing image or text printing on a surface of a target to be printed in which a cylinder or a printing area is a cylinder.

背景技术Background technique

The simplest method of printing fine patterns and characters on curved surfaces in the prior art is to print on a flat carrier, which is combined with the target curved surface, which is time consuming and laborious and the final effect cannot be guaranteed. Chinese patent CN94115805.5 discloses a pattern transfer method, a printing method for transferring a line on a curved surface of a molded article, using a silk tissue paper as a transfer paper, and printing a pattern with a high-temperature sublimation gas dyeing ink to pre-form the surface of the molded product Treatment, including cleaning, priming, primer heat hardening, upper induction resin and hardening, and then applying a layer of inductive adhesive on the transfer paper, and the induction resin can be completely dissolved in the solution, and then the transfer paper is pasted On the surface of the curved surface, it is not necessary to pressurize the mold, and the high-temperature gasification sublimation reaction is used to make the pattern realistically transfer to the curved surface surface, which is aesthetically pleasing, durable and not easy to fall off.

With the increasing development of inkjet printing technology, people began to try to directly print ink on curved objects to form the desired pattern or text. U.S. Patent No. 6,100,295, 885, issued to U.S. Patent No. 6,100, 295, 885 issued to the disclosure of the entire entire entire entire entire entire entire entire entire entire entire entire entire disclosure Without moving, the printed object rotates about its central axis of rotation and advances along the central axis of rotation. The ink jet printing apparatus using this type of motion has a fast printing speed, but has a complicated structure and high printing cost.

Chinese Patent No. 200510045534.7 proposes a device for printing graphics on the surface of a candle, the device comprising an inkjet printing unit, the printing unit comprising a printing bracket, a printing head disposed on the printing bracket, the printing head being linearly reciprocable relative to the bracket, and inkjet printing Two mutually parallel rotating shafts are disposed under the unit, at least one rotating shaft is coupled to the driving device, and the driving device and the inkjet printing unit are connected to the circuit board. The candle to be printed is placed on two mutually parallel rotating shafts, and since the device is not provided with a pressing mechanism, the driving force of the candle during the rotation is insufficient. During the printing process, the rotating shaft drives the candle to rotate stepwise, and the ink droplets ejected on the surface of the candle during the reciprocating movement of the printing head. With this printing method, the printing speed is slow and the printing efficiency is low.

Japanese Patent No. JPH08207265A proposes a printing apparatus capable of printing high quality images on the surfaces of cylindrical printing objects of different diameters. The apparatus includes a printing unit for ejecting ink droplets onto a surface of a cylinder to be printed, on which a print head is mounted. The printing device provides an adjustment holding mechanism for adjusting and maintaining the height between the surface of the cylinder to be printed and the print head at a predetermined height. The adjustment and holding mechanism provides a pair of support shafts for supporting and driving the cylinder to be printed to rotate about a central axis, and a motor for driving at least one of the rotation shafts of the support shaft to rotate. The inkjet printing device comprises a double-axis driving mechanism, a lifting mechanism and a pressing mechanism, and the screw driving the printing unit to spray the ink droplets to the stepping movement around the central axis during the movement of the central axis of the printing cylinder Print on the object. The printing method also has the problems of slow printing speed and low printing efficiency.

The inkjet printing on the surface of the cylinder using the inkjet printing technology of the prior art is reciprocating on the horizontal rail by the inkjet head, and the object to be printed is conveyed by the roller with respect to the stepping motion of the printing head to realize the object to be printed. Print a pattern or text on the surface. This inkjet printing method has a slow printing speed and low printing efficiency.

发明内容Summary of the invention

In view of the problems in the prior art, an object of the present invention is to provide an ink jet printing apparatus and inkjet that realize variable data printing on a cylindrical surface with simple structure, simple motion control, fast printing speed, and high printing efficiency. Printing method.

In order to achieve the above object, the present invention provides an inkjet printing apparatus including a blanking portion for mounting and driving an object to be printed, a printing portion for mounting and driving a printing carriage, and at least one printing on the printing carriage. a control system for controlling the operation of the print head and the movement of the printing carriage and the object to be printed, the printing carriage being disposed above the central axis of rotation of the object to be printed; characterized in that the print head nozzle on the printing carriage is located The straight line is parallel to the first axis, and the control system controls the printing carriage to perform a one-way step movement along the first axis, and the control system controls the blanking portion to rotate the object to be printed around the second axis, and the rotation center axis of the object to be printed is the second axis. Its first axis is parallel to the second axis.

A print head is provided on the printing carriage in the above ink jet printing apparatus for printing a single color ink.

The plurality of print heads on the carriage of the above-described inkjet printing apparatus are sequentially arranged at equal intervals in the direction in which the head nozzles are arranged.

In the above inkjet printing device, the object to be printed is a cylinder or the area to be printed of the object to be printed is a cylinder, such as a bottle label printed on the bottle body.

The feeding portion of the inkjet printing device includes a feeding mechanism, the feeding mechanism includes a first rotating shaft, a second rotating shaft, and a first driving mechanism, and the object to be printed is placed on the first rotating shaft and the Between the second rotating shafts, the first driving mechanism is configured to drive the first rotating shaft and/or the second rotating shaft to rotate to drive the object to be printed to rotate.

In the above inkjet printing device, two rubber wheels are disposed on each of the first rotating shaft and the second rotating shaft, and the rubber wheel can move left and right along the axial direction of the first rotating shaft or the second rotating shaft.

The blanking portion of the inkjet printing device further includes a positioning mechanism including a positioning bead and a positioning bracket, the positioning bead being mounted on the positioning bracket and movable up and down along the positioning bracket in a vertical direction.

The blanking portion of the inkjet printing device further includes a lifting mechanism including a second driving mechanism, a guiding mechanism and a detecting mechanism, the second driving mechanism driving the object to be printed to ascend or descend, and the guiding mechanism ensures the object to be printed Moving in the vertical direction, the detecting mechanism is for detecting the distance of the object to be printed rising or falling in the vertical direction.

The blanking portion in the above inkjet printing device further includes a pressing mechanism fixedly disposed directly under the printing carriage and directly above the object to be printed, the pressing mechanism including the first optical axis and the first set in parallel Two optical axes, two pressing wheels are respectively disposed on the first optical axis and the second optical axis, and the third driving mechanism drives the first optical axis and the second optical axis to be synchronized along a third axis direction perpendicular to the first axis Close to or away from the object to be printed.

The printing portion in the above inkjet printing device comprises a printing carriage and a printing bracket, the printing bracket comprises a rail beam, a first motor and a first screw, a rail is mounted on the rail beam, and the first screw is mounted on the printing trolley The first wire mates, the first motor cooperates with one end of the first screw rod, and the first motor drives the first screw rod to rotate to drive the printing carriage to perform a stepping motion along the first axis.

The invention also provides a printing method of an inkjet printing device, characterized in that, in inkjet printing, the control system controls the printing carriage to perform a stepping motion along the first axis, and simultaneously controls the object to be printed to continuously rotate around the second axis. During the rotation of the object to be printed, the control system controls the print head on the carriage to eject ink droplets onto the object to be printed until the desired image is printed on the surface of the object to be printed.

The above inkjet printing method further comprises: before the inkjet printing, the control system controls the blanking portion to descend to the lowest end, and the operator manually places an unprinted object to be printed on the stocking portion, and then controls a transmission support controlled by the system. The mechanism raises the object to be printed until the distance between the highest side of the object to be printed and the face of the print head nozzle on the printing carriage is the most suitable distance for printing.

The above inkjet printing method further includes, after the printing is finished, the control system controls the blanking portion to be lowered to the lowest position, the operator removes the already printed object to be printed, and places an unprinted object to be printed on the walking. On the material portion, and control the blank portion to rise until the distance between the highest surface of the object to be printed and the surface of the print head nozzle on the printing carriage is the most suitable distance for printing.

In the printing method of the above-described inkjet printing apparatus, the distance by which the printing carriage is stepped is determined by dividing the printing head printing distance by the number of PASSs that need to be printed, that is, the printing precision determined by the user in the stepping direction of the printing carriage.

In the printing method of the inkjet printing device described above, the object to be printed is a cylinder or the portion to be printed of the object to be printed is a cylinder.

In the printing method of the above ink jet printing apparatus, the most suitable distance for printing is 1 to 3 mm.

In the inkjet printing apparatus of the present invention, the object to be printed is placed between the first rotating shaft and the second rotating shaft, and since the at least one rotating shaft is coupled with the driving device, the rotation of the first rotating shaft and/or the second rotating shaft drives the object to be printed to rotate. The moving print head can print an image or a character on the outer peripheral surface of the cylinder of the object to be printed which is continuously rotated; since the paper feeding mechanism can move up and down with respect to the printing carriage in the vertical direction, the ink jet printing apparatus of the present invention can be applied to Cylindrical objects to be printed of different diameters. By adjusting the rising height of the paper feeding mechanism, the distance between the highest point of the object to be printed and the print head can be the most suitable distance for printing, and the device can be used by setting the number of print heads on the printing carriage in the inkjet printing device. Print in monochrome or color.

附图说明DRAWINGS

1 is a perspective view of an inkjet printing apparatus in accordance with an embodiment of the present invention;

Figure 2 is a bottom plan view of an arrangement of printheads in accordance with one embodiment of the present invention;

3 is a perspective view of a feeding mechanism according to an embodiment of the present invention;

Figure 4 is a front elevational view of the dredging mechanism in accordance with one embodiment of the present invention;

Figure 5 is a plan view of the dredging mechanism in accordance with one embodiment of the present invention;

Figure 6 is a perspective view showing the removing mechanism of the pressing mechanism in an embodiment of the present invention;

Figure 7 is a front elevational view showing the dredging mechanism with the pressing mechanism removed in an embodiment of the present invention;

Figure 8 is a perspective view of a pressing mechanism in an embodiment of the present invention;

Figure 9 is a perspective view showing another state of the pressing mechanism in one embodiment of the present invention;

Figure 10 is a perspective view showing the printing start stage of the ink jet printing apparatus of the present invention;

Figure 11 is a perspective view showing the printing process of the ink jet printing apparatus of the present invention;

Figure 12 is a perspective view showing the inkjet printing apparatus of the present invention at the end of printing.

具体实施方式detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in FIG. 1, an inkjet printing apparatus in one embodiment of the present invention includes a printing portion 01 and a stocking portion 02. The printing portion 01 includes a printing carriage 2 and a printing carriage. The printing carriage includes a rail beam 74 and a fourth driving unit. The mechanism, the printing carriage 2 is mounted on the rail beam 74, and a rail 73 is mounted on the rail beam 74. The fourth driving mechanism includes a first motor 72 and a first screw 71. The first screw 71 cooperates with a first wire mounted on the printing carriage 2, and the first motor 72 and the first screw 71 pass through a coupling. 76 is connected, and the first motor 72 drives the first screw 71 to rotate to drive the printing carriage 2 to perform a stepping motion along the first axis.

Anti-collision devices

75a and 75b are also mounted on both ends of the rail beam 74. The anti-collision device in one embodiment of the present invention employs a polyurethane block. A plurality of print heads are mounted on the print carriage 2, and an ink cartridge for accommodating ink and a corresponding negative pressure control system are further disposed on the print carriage 2.

As shown in FIG. 2, the print carriages 2 in this embodiment are provided with four

print heads

21a, 21b, 21c, 21d for respectively ejecting cyan (C) ink, magenta (M) ink, yellow (Y) ink and Black (K) ink. The print heads of the

print heads

21a, 21b, 21c, and 21d have a straight line a-a axis, and the

print heads

21a, 21b, 21c, and 21d are sequentially arranged at equal intervals along the a-a axis. In the embodiment of the present invention, a row of nozzles is disposed on the print head, and the print head of the present invention may also be a print head provided with two rows of nozzles, but the spacing between the two rows of nozzles is preferably about 2 mm. Moreover, the print width D of the print head is preferably narrow, so that the print head enters the print area at a faster speed, which can improve the printing efficiency of a single print object.

As shown in FIG. 3-5, the stocking portion 02 in one embodiment of the present invention includes a stocking mechanism 1, a lifting mechanism 5, and a pressing mechanism 3, and the stocking portion 02 is used for mounting and driving the object to be printed 4 around the second. The shaft rotates or moves up and down in a vertical direction; a control system is used to control the operation of the print head and the movement of the carriage 2 and the object 4 to be printed. The printing carriage 2 is disposed above the rotation central axis (X axis) of the object 4 to be printed, and the control system controls the printing carriage 2 to move stepwise in the direction indicated by the arrow a of the first axis, and controls the feeding portion 02 to drive the object to be printed 4 to be wound. The rotation center axis (second axis) is rotated, and the print head on the carriage 2 is controlled to eject ink onto the surface of the object 4 to be printed to perform printing of an image or a character during the rotation of the object 4 to be printed. The object to be printed 4 of the present invention is a bottle 4 having a cylindrical body.

As shown in FIG. 6-7, the loading mechanism 1 in one embodiment of the present invention includes a first rotating shaft 12a, a second rotating shaft 12b and a first driving mechanism 11, and the first rotating shaft 12a and the second rotating shaft 12b are disposed in parallel with the feeding. At the upper end of the bracket 10, the first driving mechanism 11 is mounted on the left end of the loading bracket 10. The first driving mechanism 11 includes a first motor 18 and a belt pulley assembly 15, and the first motor 18 passes through the belt pulley assembly 15 and the first rotating shaft. 12a is coupled to the second rotating shaft 12b. The bottle 4 is placed between the first rotating shaft 12a and the second rotating shaft 12b. The diameter of the bottle 4 is larger than the distance between the first rotating shaft 12a and the second rotating shaft 12b, and the central axis of rotation of the bottle 4 and the first rotating shaft 12a and / Or the second rotating shaft 12b is parallel. The first driving mechanism 11 is for driving the first rotating shaft 12a and/or the second rotating shaft 12b to rotate to drive the bottle 4 to rotate. An encoder 14 is connected to one end of the second rotating shaft 12b opposite to the first driving mechanism 11, and the encoder 14 is for detecting the rotational speed of the second rotating shaft 12b, that is, the rotational speed of the bottle 4. The first drive mechanism 11 in the present invention can also individually drive the first rotating shaft 12a to rotate or separately drive the second rotating shaft 12b to rotate. The encoder 14 of the present invention can also be mounted on the first rotating shaft 12a. In order to prevent the outer surface of the bottle 4 from being rubbed off by the first rotating shaft 12a or the second rotating shaft 12b during the rotation, the first rotating shaft 12a and the second rotating shaft 12b may be respectively disposed near the ends of the bottle 4. The first rubber wheel 13a, the second rubber wheel 13b and the third rubber wheel 13c, the fourth rubber wheel 13d, the first rubber wheel 13a and the second rubber wheel 13b are axially slidable along the first rotating shaft 12a, and the third rubber wheel 13c And the fourth rubber wheel 13d can slide axially along the second rotating shaft 12b to ensure that the contact positions of the first rubber wheel 13a, the second rubber wheel 13b, the third rubber wheel 13c, the fourth rubber wheel 13d and the bottle 4 are located in the bottle 4 Outside the print area.

In one embodiment of the present invention, the stocking portion 02 of the ink jet printing apparatus further includes a positioning mechanism 16 disposed at the right end of the printer. Generally, the right end of the printer is a starting point. Of course, the positioning mechanism 16 in the present invention can also be disposed at the left end of the printer, and the left end of the printer is the starting point. The positioning mechanism 16 includes a positioning bead 161 and a positioning bracket 162. The positioning bead 161 is mounted on the positioning bracket 162 and can move up and down along the positioning bracket 162 in the vertical direction. The bottom of the bottle 4 rests on the positioning bead 161 throughout the ink jet printing process.

The take-up portion 02 of the ink jet printing apparatus in one embodiment of the present invention further includes a lifting mechanism 5 which can be electrically, pneumatically or manually. The elevating mechanism 5 is for adapting the ink jet printing apparatus of the present invention to print cylinders of different diameters, or objects to be printed in which the area to be printed is a cylinder. The lifting mechanism 5 in one embodiment of the present invention includes a second driving mechanism, a guiding mechanism, a limiting mechanism and a lifting bracket 50, and the lifting bracket 50 is connected to the loading bracket 10 through the connecting

plates

17a, 17b. The second driving mechanism drives the up/down movement of the object to be printed 4, the guiding mechanism ensures that the object to be printed 4 moves in the vertical direction, and the limiting mechanism is used to detect the lowest position of the object 4 to be printed in the vertical direction. The second driving mechanism includes a second motor 51, a second lead screw 52 and a second spring (not shown). The second motor 51 is fixedly disposed on the lifting bracket 50, and the output shaft of the second motor 51 passes through the coupling. The second screw 56 is fixedly connected to the bottom of the loading bracket 10, and the second motor 51 is driven to drive the second screw. The rotation of 52 drives the second nut that cooperates with the second screw 52 to move up and down. Since the second nut is fixedly mounted on the loading bracket 10, and the loading mechanism 1 is mounted on the loading bracket 10, the second The operation of the motor 51 is finally to drive the stocking mechanism 1 and the bottle 4 placed on the stocking mechanism 1 to move up and down in the vertical direction. The guiding mechanism includes a first guiding optical axis 53a, a second guiding optical axis 53b, a third guiding optical axis 54a and a fourth guiding optical axis 54b, and the first guiding optical axis 53a and the second guiding optical axis 53b are symmetrically disposed on the second wire On both sides of the rod 52, the third guiding optical axis 54a and the fourth guiding optical axis 54b are symmetrically disposed on both sides of the second screw 52, and the first guiding optical axis 53a and the second guiding optical axis 53b are located at the third guiding light The inside of the shaft 54a and the fourth guide optical axis 54b. Both ends of the first guiding optical axis 53a and the second guiding optical axis 53b are respectively connected to the elevating fixing plate 18 and the elevating bracket 50 through the optical axis seat. Both ends of the third guiding optical axis 54a and the fourth guiding optical axis 54b are respectively connected to the loading bracket 10 and the lifting movable plate 19 through the optical axis seat.

The stocking portion 02 further includes a detecting mechanism including a grating 55 fixedly disposed on the lifting bracket 50 and a grating reading head 56 disposed on the lifting mechanism 5. In order to ensure the detection accuracy, the grating in the present invention is preferably a porcelain grid.

As shown in FIGS. 8-9, the pressing mechanism 3 in one embodiment of the ink jet printing apparatus of the present invention includes a double-head screw 36, a first optical axis 31a, and a second optical axis 31b, which are on the first optical axis 31a. The first pressure roller 32a and the second pressure wheel 32b are mounted thereon, and the first pressure roller 32a and the second pressure roller 32b are movable left and right along the axis of the first optical axis 31a; and the third pressure roller 32c is mounted on the second optical shaft 31b. And the fourth pressure wheel 32d, the third pressure wheel 32c and the fourth pressure wheel 32d are movable left and right along the axis of the second optical axis 31b by moving the distance between the first pressure roller 31a and the second pressure roller 31b, and the third The distance between the pressing wheel 31c and the fourth pressing wheel 31d is adapted to the printing of cylinders of different heights. A first gear 33a and a first adjustment block 34a are attached to the left end of the first optical axis 31a, and a second gear 33b and a second adjustment block 34b are attached to the right end of the first optical axis 31a. A third gear 33c and a third adjustment block 34c are attached to the left end of the second optical axis 31b, and a fourth gear 33d and a fourth adjustment block 34d are attached to the right end of the second optical axis 31b. A knob 35 is attached to one end of the double-head screw 36. The double-headed screw 36 includes a length of left-handed thread 361, a length of optical axis 362 and a length of right-handed thread 363. The first adjustment block 34a cooperates with the right-handed threaded section 363 of the double-headed screw 36, and the third adjustment block 34c cooperates with the left-handed threaded section 361 of the double-headed screw 36. The double-head screw 36 is mounted on the first rack 38a through the first mounting block 39a and the second mounting block 39b, and one end of the first optical axis 31a and one end of the second optical axis 31b pass through the first adjustment block 34a and the first The three adjustment block 34c is mounted on the double-head screw 36. The other end of the first optical axis 31a and the other end of the second optical axis 31b are mounted on the guiding optical axis 30 via the second adjusting block 34b and the fourth adjusting block 34d, respectively. The guide optical axis 30 is mounted on the second rack 38b via the third mounting block 39c and the fourth mounting block 39d. By rotating the knob 35, the first optical axis 31a and the second optical axis 31b can be brought close to each other or away from each other to accommodate the objects 4 to be printed of different diameters. The pressing mechanism 3 is fixedly mounted on the lifting bracket 50 by the first pressing bracket 30a, the second pressing bracket 30b, the third pressing bracket 30c, and the fourth pressing bracket 30d.

A UV curing device (not shown) is also disposed on the stocking portion 02 for curing the ink droplets ejected onto the object 4 to be printed.

As shown in FIG. 10, before the inkjet printing, the object 4 to be printed is placed between the first rotating shaft 12a and the second rotating shaft 12b of the feeding mechanism 1 of the stocking portion 02, and one end of the object to be printed 4 is placed against the positioning. On the positioning bead 161 of the mechanism 16, after the object 4 to be printed is mounted, the object 4 to be printed is moved upward in the vertical direction by adjusting the lifting mechanism 5, so that the plane of the print head on the printing carriage 1 is away from the object to be printed 4 to be printed. The distance between the faces is printed at the most suitable distance (by 1 to 3 mm), and the optimum distance for printing depends on the material of the printing object selected by the user and the performance of the printing ink. Taking two pass printing as an example, the first half nozzle of the first print head 21a enters the printing area at the start of inkjet printing, and the control system controls the first half of the nozzles of the print head 21a to eject ink droplets on the rotating object to be printed 4 during printing. The first half of the print head 21a and the print head 21b, the print head 21c, and the print head 21d are not ejected during the first pass printing process. The object to be printed 4 is continuously rotated around the bb axis during printing, and the object to be printed 4 is to be printed. After one rotation, the print head steps half of the print head along the aa axis in the direction indicated by arrow a.

As shown in FIG. 11, when all the print head nozzles enter the print area, the control system controls the print carriage 2 to move stepwise along the aa axis (first axis), and controls the movement portion 02 to drive the rotation of the object to be printed 4 around the object to be printed. The central axis bb axis (second axis) continuously rotates, and at the same time, the print head on the printing carriage 2 is sprayed with ink droplets on the rotating object to be printed 4, and the object to be printed 4 is rotated one week, and the control system controls the blanking portion to drive the trolley to be printed. 1 Stepping half of the print head along the first axis (x-axis), the printing carriage 1 stops after stepping, and the control system controls the print head on the printing carriage 2 to eject ink drops on the rotating object 4 to be printed, and the whole printing In the process, the control system controls the printing carriage 2 to perform a stepping motion along the first axis, and controls the object to be printed 4 to rotate at a constant speed.

As shown in Fig. 12, at the last pass phase of the end of the ink-jet printing, the

print heads

21a, 21b, 21c on the carriage 2 have completely left the print zone, the first half of the nozzles of the print head 21d have left the print zone, and the second half of the nozzles In the printing area, the control system controls the second half of the nozzles of the print head 21d to eject ink drops on the object to be printed 4 to complete the printing of the last pass. After the printing is finished, the control system controls the lifting mechanism 5 to drive the printed objects to be printed 4 Falling to the lowest position in the vertical direction, the operator removes the already printed object 4 to be printed, and places a new unprinted object 4 to be printed on the stocking mechanism 1, and the control system controls the lifting mechanism 5 to be The print object 4 is raised to a suitable print position for the print job of the next object to be printed.

The movement mode of the inkjet printing device of the present invention is the stepping motion of the printing carriage, and the object to be printed is continuously rotated, which makes the structure of the inkjet printing device simple and the printing efficiency is high. The inkjet printing device of the present invention prints a bottle for 30 to 50 seconds, whereas in the prior art, the movement mode is a reciprocating scanning motion of the printing carriage, and the time of printing the bottle by the inkjet printing device of the stepwise rotation of the object to be printed is 2~4 minutes. Thus, it can be seen that the ink jet printing apparatus of the present invention can remarkably improve printing efficiency in a structurally similar situation with respect to the prior art.

It is to be understood that any modifications may be made without departing from the spirit and scope of the invention.

Claims

An inkjet printing device comprising a blanking portion for mounting and driving an object to be printed; a printing portion for mounting and driving a printing carriage, at least one printing head mounted on the printing carriage; a control system for Controlling the operation of the print head and the movement of the printing carriage and the object to be printed, the printing carriage being disposed above the central axis of rotation of the object to be printed; characterized in that the line of the print head nozzle on the printing carriage is located with the first axis Parallelly, the control system controls the printing carriage to perform a one-way stepping motion along the first axis, and the control system controls the feeding portion to rotate with the object to be printed about the second axis, the second The axis is the central axis of rotation of the object to be printed.
The ink-jet printing apparatus according to claim 1, wherein a plurality of print heads on said carriage are sequentially and equidistantly arranged in the direction in which the head nozzles are arranged.
The ink-jet printing apparatus according to claim 1, wherein the object to be printed is a cylinder or a region to be printed on the object to be printed is a cylinder.
The ink-jet printing apparatus according to claim 1, wherein said stocking portion comprises a feeding mechanism, said feeding mechanism comprising a first rotating shaft, a second rotating shaft, and a first driving mechanism, said to be printed The object is placed between the first rotating shaft and the second rotating shaft, and the first driving mechanism is configured to drive the first rotating shaft and/or the second rotating shaft to rotate to drive the object to be printed to rotate.
The ink-jet printing apparatus according to claim 1, wherein said stocking portion further comprises a positioning mechanism, said positioning mechanism comprising a positioning bead and a positioning bracket, said positioning bead being mounted on the positioning bracket and It can be moved up and down along the positioning bracket in the vertical direction.
The ink-jet printing apparatus according to claim 1, wherein said stocking portion further comprises a lifting mechanism, said lifting mechanism comprising a second driving mechanism and a guiding mechanism, said second driving mechanism driving said waiting The printing object is raised or lowered, and the guiding mechanism ensures that the object to be printed moves in the vertical direction.
The ink-jet printing apparatus according to claim 1, wherein said stocking portion further comprises a pressing mechanism fixedly disposed directly under said printing carriage and said feeding mechanism Directly above, the pressing mechanism includes a first optical axis and a second optical axis disposed in parallel, and two pressing wheels are respectively disposed on the first optical axis and the second optical axis, and the third driving mechanism drives the first The optical axis and the second optical axis are synchronized toward or away from the object to be printed in a third axial direction perpendicular to the first axis.
A printing method for an ink-jet printing apparatus according to any one of claims 1 to 7, wherein, in the ink-jet printing, the control system controls the printing carriage to perform a stepping motion along the first axis while controlling the object to be printed to be wound around the second The axis performs a continuous rotation motion. During the rotation of the object to be printed, the control system controls the print head on the carriage to eject ink droplets onto the object to be printed until the desired image is printed on the surface of the object to be printed.
A printing method of an ink-jet printing apparatus according to claim 8, further comprising: before the ink-jet printing, the control system controls the dropping portion to descend to the lowest end, and the operator manually places an unprinted object to be printed On the stocking portion, the control system then controls the stocking portion to raise the object to be printed until the distance between the highest side of the object to be printed and the face of the print head nozzle on the printing carriage is the most suitable distance for printing.
A printing method of an ink-jet printing apparatus according to claim 9, further comprising: after the printing is finished, the control system controls the blanking portion to be lowered to the lowest position, and the operator removes the already-printed object to be printed. And placing an unprinted object to be printed on the blanking portion, and controlling the blanking portion to rise until the distance between the highest surface of the object to be printed and the surface of the printing head nozzle on the printing carriage is the most suitable for printing. distance.
The printing method of the inkjet printing device according to claim 8, wherein the object to be printed is a cylinder or the area to be printed on the object to be printed is a cylinder.
A printing method of an ink jet printing apparatus according to claim 8, wherein a distance that the carriage is stepped along the first axis is equal to a length of a line on which the nozzle is located on the print head divided by a number of passes (PASS number) .
A printing method of an ink jet printing apparatus according to claim 8, wherein the optimum distance for printing is 1 to 3 mm.