CN211000515U

CN211000515U - Device for continuous high-speed printing on cylindrical surface

Info

Publication number: CN211000515U
Application number: CN201920752174.1U
Authority: CN
Inventors: 王凤斌; 韩刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2020-07-14
Anticipated expiration: 2029-05-23

Abstract

The utility model discloses a device for continuous high-speed printing on a cylindrical surface, which comprises a printing head, a plurality of workpiece fixing supports, a conveyor belt and a workpiece loading and unloading device, wherein the printing head is fixed, the workpiece fixing supports are provided with a plurality of parts and fixed on the conveyor belt, the parts are conveyed by the conveyor belt to pass through the printing head one by one, a cylindrical workpiece is placed on each workpiece fixing support, and the conveyor belt runs at a constant speed; the printing head is provided with a plurality of ink jetting ports, and the arrangement direction of the ink jetting ports, the uniform speed direction of the conveyor belt and the axial direction of the cylindrical workpiece are mutually parallel.

Description

Device for continuous high-speed printing on cylindrical surface

Technical Field

The utility model relates to an ink jet printing technology field especially relates to a device that carries out continuous high-speed printing on cylindrical surface.

Background

With the increasing market of product processing, personal customization, advertising promotion, group customization and the like, the traditional four-color printing on the outer surface of cylindrical articles such as pop-top cans, cosmetic bottles, water bottles, vacuum cups and the like has been applied in the technical field of color ink-jet printing for many years. When the printing process of the technology is complex, each color needs to be engraved separately, the time period is long, the plate making cost is high, the requirement on the printing surface is high, and the requirement of the user on image variability cannot be met only by uniformly and repeatedly printing patterns.

Digital ink-jet printing is non-contact printing on demand, does not need a complex process of engraving, does not need plate making, greatly saves production time, can meet the requirements of all users by variable and repeated image printing, is more environment-friendly compared with the traditional printing, and hardly has environmental pollution. Digital printing is a convenient means, different patterns can be replaced as desired, and attention and popularization of the industry are more and more attracted. However, the current method for printing on the outer surface of the cylindrical object basically depends on the function of expanding the flat-bed printer, namely, on the original flat-bed printer, the beam is stepped to be converted into the object rotating through the friction roller, so that the method still uses a nozzle reciprocating type and object stepping mode to print pictures on the surface of the object little by little. Although the method borrows the well-established flat-panel printer equipment, the implementation is relatively simple. Its drawbacks are also evident, and the main drawbacks are mainly three. One is that with the reciprocating printing method, after each line is printed, the article is rotated a little bit before the next line is printed. Therefore, only a narrow screen can be printed at a time, and the printing needs to be repeated many times, so that the printing efficiency is low. Secondly, because the printed surface is cylindrical, the distance between the ink jet printing head and the printed surface is inconsistent, and only a small part of spray orifices of the spray head can be utilized during each printing, and the spray head is easily damaged by the operation mode. Thirdly, when the flat printing mechanism is reused, only a few articles can be printed each time, and after printing is finished, the articles need to be replaced by new articles, so that the printing mode is an intermittent printing mode.

SUMMERY OF THE UTILITY MODEL

The utility model discloses one of the technical problem that will solve is to improve the printing speed on cylindrical workpiece surface to prevent that the ink jet dry and hard to block up.

In order to solve the technical problem, the utility model provides a device for continuous high-speed printing on a cylindrical surface, which comprises a printing head, a workpiece fixing support, a conveyor belt and a workpiece loading and unloading device, wherein the printing head is fixed, the workpiece fixing support is provided with a plurality of parts and is fixed on the conveyor belt, the parts are conveyed at a constant speed by the conveyor belt and pass through the printing head one by one, a cylindrical workpiece is placed on each workpiece fixing support, and the cylindrical workpiece is driven by the workpiece fixing support to rotate at a constant speed;

the printing head is provided with a plurality of ink jetting ports, and the arrangement direction of the ink jetting ports, the uniform speed direction of the conveyor belt and the axial direction of the cylindrical workpiece are mutually parallel;

the radius r of the cylindrical workpiece, the rotating speed s of the cylindrical workpiece, the conveying speed v of the conveyor belt, the firing frequency f of the spray head, the resolution d of the image to be printed, the effective printing distance L of the spray head and the number n of ink jetting openings in the printing device satisfy the relation v of L. f. n/2 π r. d.

In one embodiment, the workpiece handling device removes the printed cylindrical workpiece by a robot and mounts the cylindrical workpiece to be printed on the workpiece fixing support.

In one embodiment, the printing head comprises a nozzle, a guide rail and a pneumatic sliding table, the nozzle is fixed on the pneumatic sliding table, and the pneumatic sliding table is arranged on the guide rail, so that the position of an ink jetting port can be adjusted.

In one embodiment, the workpiece holding fixture includes a guide bar and a pin holder in which the cylindrical workpiece is placed.

According to another aspect of the present invention, there is also provided a printing method for a cylindrical workpiece surface, the method comprising:

fixing a cylindrical workpiece on a workpiece fixing support, fixing the workpiece fixing support on a conveyor belt, and driving the workpiece fixing support to rotate at a constant speed;

the method comprises the following steps that a conveying belt is utilized to enable a cylindrical workpiece to pass through a fixed printing head one by one, a plurality of ink jetting ports are arranged in the printing head, and the arrangement direction of the ink jetting ports, the uniform speed direction of the conveying belt and the axial direction of the cylindrical workpiece are arranged to be parallel to each other;

In one embodiment, an automatic workpiece handling device is arranged on the conveyor belt for removing the printed cylindrical workpiece and mounting the cylindrical workpiece to be printed on the workpiece fixing bracket.

In one embodiment, a nozzle, a guide rail and a pneumatic sliding table are arranged in the printing head, the nozzle is fixed on the pneumatic sliding table, and the pneumatic sliding table is arranged on the guide rail, so that the position of an ink jetting port can be adjusted.

In one embodiment, a guide bar and a bottle holder are provided in the workpiece holding frame, and a cylindrical workpiece is placed in the bottle holder.

Compared with the prior art, the utility model discloses a key technology point and advantage as follows:

1. the utility model discloses a make cylindrical workpiece with the rotatory motion mode that advances in succession in limit, improved printing efficiency.

2. The utility model provides an all print the ink jet orifice array orientation and the advancing direction of cylindrical work piece is parallel, and consequently all print the ink jet orifice and be unanimous apart from the distance on cylindrical surface to guaranteed that all print the ink jet orifice and all can obtain utilizing, avoided because the ink jet orifice does not jet ink for a long time and the condition of ink jet orifice is blockked up to the ink dryout that causes.

3. The utility model provides a print the ink jet is fixed, and it is different from among the prior art and prints the shower nozzle and need be for work piece reciprocating motion's technological means to avoided owing to print the ink droplet skew that the shower nozzle caused owing to remove.

4. Based on the utility model discloses a high-speed printing device the utility model discloses still provide for obtaining the best printing effect, cylindrical workpiece radius r, cylindrical workpiece rotation rate s, conveyer belt transfer speed v, shower nozzle ignition frequency f, wait to print image resolution ratio d and the shower nozzle effectively prints the parameter relation that needs to satisfy between the distance L.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, together with the description of embodiments of the invention, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a printing apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a print head of a printing apparatus according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a workpiece fixing bracket of a printing apparatus according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a bottle holder of a printing device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a continuous high-speed printing apparatus according to the present invention. The utility model discloses a continuous high-speed printing device is including beating printer head 1, work piece fixed bolster 2, conveyer belt 3 and work piece handling device 4. The printing head 1 is fixed, the workpiece fixing supports 2 are provided with a plurality of parts and fixed on the conveyor belt 3, the parts are conveyed by the conveyor belt 3 to pass through the printing head 1 one by one, cylindrical workpieces are placed on each workpiece fixing support and driven by the workpiece fixing supports to rotate at a constant speed, and the conveyor belt 3 operates at a constant speed. The workpiece handling device 4 takes off the printed cylindrical workpiece through an automatic device and installs the cylindrical workpiece to be printed on the workpiece fixing bracket.

Fig. 2 shows in this implementation the structural schematic diagram of the printing head 1, a spray head 11, a guide rail 12, a pneumatic sliding table 13, an electromagnetic valve group 14, a control panel 15, a peristaltic pump 16, a diaphragm pump assembly 17, a secondary ink cartridge 18, an air bottle 19, a main ink bottle 110, a grating assembly 111 and a bottom plate 112, wherein the spray head 11 is fixed on the pneumatic sliding table 13, the pneumatic sliding table 13 is arranged on the guide rail 12, the pneumatic sliding table 13 and the guide rail 12 form a moving pair, the grating assembly 111 is arranged in parallel with the guide rail 12, and the electromagnetic valve group 14 is connected with the pneumatic sliding table 13. The base is provided with a bottom plate 112, and the guide rail 12, the electromagnetic valve group 14 and the grating component 111 are respectively fixed on the bottom plate 112. The electromagnetic valve group 14 is connected with a control panel 15, and the label printing device and the ink maintenance device are controlled and coordinated through the control panel 15 respectively. Grating subassembly 111 include the grating and with the grating encoder that the grating is connected, be equipped with shower nozzle electrical interface, solenoid valve electrical interface and grating encoder electrical interface on the control panel 15, shower nozzle electrical interface with shower nozzle 11 is connected, solenoid valve electrical interface with solenoid valve 14 is connected, grating encoder electrical interface with the grating encoder is connected. The ink maintenance device comprises a peristaltic pump 16, a diaphragm pump assembly 17, a secondary ink box 18, an air bottle 19 and a main ink bottle 110, wherein the diaphragm pump assembly 17 comprises a first diaphragm pump and a second diaphragm pump, an outlet of the main ink bottle 110 is connected with an inlet of the secondary ink bottle 18 through the first diaphragm pump, an outlet of the secondary ink bottle 18 is connected with an inlet of the main ink bottle 110 through the second diaphragm pump, an outlet of the secondary ink bottle 18 is connected with an inlet of the spray head 11, and an outlet of the spray head 11 is connected with an inlet of the main ink bottle 110 through the peristaltic pump 16. The head 11 in the print head 1 is a high-resolution tape, exclusive circulation channel head, and has a plurality of ejection ports arranged in a direction parallel to the conveyance direction of the conveyance belt 3.

Fig. 3 and 4 are schematic structural views of the workpiece fixing bracket 2 in this embodiment. Treat that the print work piece is fixed on work piece fixed bolster 2, work piece fixed bolster 2 has mounting panel 21, the last surface welding of mounting panel 21 has guide bar 24, and the top of guide bar 24 is provided with holds in the palm bottled ware 25, and hold in the palm bottled ware 25 bolt fastening on mounting panel 21, the left and right sides of guide bar 24 all is provided with the bearing frame, and the right side of bearing frame installs gas pole 23, and gas pole 23 fixes on mounting panel 21, the middle part of bearing frame is inlayed and is had processing platform X axle holder 22, and the left side of processing platform X axle holder 22 is provided with servo motor 26, and servo motor 26's rear is provided with locator 27. The workpiece fixing bracket 2 is arranged on the conveyor belt 3 and continuously moves along with the conveyor belt 3. The workpiece to be printed is held between the X-axis grippers 22 and rotated at high speed by the servo motor 26, the X-axis being parallel to the transport direction of the conveyor belt 3 and also parallel to the direction of the arrangement of the ink ejection openings.

In this embodiment, the cylindrical work piece of waiting to print moves along the jet orifice array direction when self is rotatory, and along with waiting to print the work piece rotation and move forward, the jet orifice quantity increases gradually, when waiting to print the work piece and rotate a week, waits to print the work piece and should move forward the effective printing distance of a shower nozzle. Subsequently, the next printing is performed until the image is completely printed. Since the workpiece to be printed is continuously moved forward while rotating itself, the image to be printed is decomposed into several pieces of images divided according to the effective printing width of the heads, as shown in fig. … ….

The parameters for controlling the image printing include the radius r of the cylindrical workpiece, the rotating speed s of the cylindrical workpiece, the conveying speed v of the conveyor belt, the firing frequency f of the nozzle, the resolution d of the image to be printed and the effective printing distance L of the nozzle, when the cylindrical workpiece rotates for one circle, the cylindrical workpiece should move forward by one effective printing distance of the nozzle, and the following parameters are:

v＝L·s/2πr (1)

the resolution d of the image to be printed is related to the firing frequency f of the nozzle and the rotating speed s of the cylindrical workpiece, the unit of the resolution d of the image to be printed is dpi, namely the number of dots per inch, and the rotating speed s of the cylindrical workpiece is 1/s of the time of passing the nozzle per inch, so that

d＝f/s (2)

In conjunction with equation (1) there is:

v＝L·f/2πr·d

meanwhile, when the number of the ink jetting ports in the nozzle is n, the following are further provided:

v＝L·f·n/2πr·d (3)

therefore, the utility model discloses well conveyer belt functioning speed should satisfy formula (3).

In summary, the present embodiment has the advantages that:

1. the embodiment improves the printing efficiency by the movement mode of enabling the cylindrical workpiece to continuously advance while rotating.

2. In the embodiment, the arrangement directions of all the printing ink jetting ports are parallel to the advancing direction of the cylindrical workpiece, so that the distances from all the printing ink jetting ports to the cylindrical surface are consistent, all the printing ink jetting ports can be utilized, and the condition that the ink jetting ports are blocked due to ink drying caused by the fact that the ink jetting ports do not jet ink for a long time is avoided.

3. The printing ink jetting port in the embodiment is fixed, which is different from the technical means that the printing nozzle needs to move back and forth relative to the workpiece in the prior art, so that the ink drop offset caused by the movement of the printing nozzle is avoided.

4. The present embodiment of the high-speed printing apparatus based on the present embodiment also proposes a parameter relationship to be satisfied between the radius r of the cylindrical workpiece, the rotational speed s of the cylindrical workpiece, the transport belt transport speed v, the firing frequency f of the head, the resolution d of the image to be printed, and the effective printing distance L of the head, in order to obtain the optimum printing effect.

The above, only be the embodiment of the present invention, the protection scope of the present invention is not limited thereto, and any technical personnel familiar with the technology are in the technical specification of the present invention, to the modification or replacement of the present invention, all should be within the protection scope of the present invention.

Claims

1. A device for continuously printing on a cylindrical surface at high speed is characterized by comprising a printing head, a plurality of workpiece fixing supports, a conveyor belt and a workpiece loading and unloading device, wherein the printing head is fixed, the workpiece fixing supports are provided with a plurality of workpiece fixing supports and fixed on the conveyor belt, the workpiece fixing supports are conveyed by the conveyor belt at a constant speed and pass through the printing head one by one, a cylindrical workpiece is placed on each workpiece fixing support, and the cylindrical workpiece is driven by the workpiece fixing supports to rotate at a constant speed;

2. An apparatus for continuous high speed printing on cylindrical surfaces as in claim 1 wherein the workpiece handling device removes the printed cylindrical workpiece by automated means and mounts the cylindrical workpiece to be printed on the workpiece holding fixture.

3. The apparatus of claim 1 wherein the printhead includes a printhead, a guide rail and a pneumatic slide, the printhead being secured to the pneumatic slide, the pneumatic slide being disposed on the guide rail so as to permit adjustment of the position of the ink ejection port.

4. Apparatus for continuous high speed printing on cylindrical surfaces according to claim 1 wherein the workpiece holding fixture includes guide bars and a pin holder in which the cylindrical workpiece is placed.