A curved printing machine

Abstract

The present invention provides a curved surface printing machine, comprising: a frame, a transfer wheel and a rotating seat arranged on the frame, a driving device for driving the transfer wheel and the rotating seat to rotate, a plurality of printing devices arranged on the rotating seat, a conveying device movably connected to the printing device, a printing plate matched with the transfer wheel, and an ink system matched with the printing plate. The curved surface printing machine of the present invention can drive the cover body to roll along the transfer wheel without stopping the movement of the rotating seat, and adjust the position difference of the cover body exceeding the transfer wheel caused by the rotation of the rotating seat through an elastic member, so that the cover body is always close to the transfer wheel during printing, and the cover body leaves the transfer wheel after printing is completed, so that printing can be achieved on the cover body without stopping the transfer wheel and the rotating seat, thereby improving the overall working efficiency of the curved surface printing machine.

Description

Technical Field

[0001] The invention relates to the technical field of printing, and in particular to a curved surface printing machine. Background Art

[0002] Curved surface printing is a printing method for printing on substrates with curved shapes. It is mostly used for printing cylindrical or conical metal, plastic, glass containers or shaped objects, such as bottle caps. Curved surface printing requires that the text and image to be printed be made into a printing plate first, and then ink is applied to the printing plate. The printing plate is then printed on the transfer wheel, and then the transfer wheel is used to print on the cover.

[0003] The current curved printing machine rotates the cover body through a turntable until it contacts the transfer wheel and then stops. The transfer wheel rotates and drives the bottle cap to rotate through friction, and ink is applied to the cover body. After printing is completed, the cover body is removed for the next printing. This method of production has a slow rhythm and low production efficiency because the cover body needs to stop at the printing position. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies in the prior art and provide a curved surface printing machine.

[0005] One embodiment of the present invention provides a curved surface printing machine, comprising: a frame, a transfer wheel and a rotating seat arranged on the frame, a driving device for driving the transfer wheel and the rotating seat to rotate, a plurality of printing devices arranged on the rotating seat, a conveying device movably connected to the printing devices, a printing plate connected to the transfer wheel, and an ink system connected to the printing plate;

[0006] The printing device comprises a first guide, a base, a cap hanging head, an elastic member and a cap removing mechanism, wherein the first guide is arranged on the rotating base and extends in a direction away from the rotating axis of the rotating base, the base is movably arranged on the first guide, the cap hanging head is rotatably connected with the base, the elastic member is arranged between the cap hanging head and the rotating base, and the cap removing mechanism is arranged on the rotating base for separating the cap hanging head from the cover body;

[0007] In the first state, the cover on the cap hanging head abuts against the wheel surface of the transfer wheel, and the rotating seat rotates to make the cover body on the cap hanging head roll along the wheel surface of the transfer wheel, and the elastic member is compressed to generate elastic deformation;

[0008] The conveying device includes a conveying track and a guide surface, wherein the conveying track is arranged on the frame and located on one side of the rotating seat, and the guide surface is arranged at the exit of the conveying track, and in the rotating direction of the rotating seat, the guide surface gradually approaches the cap hanging head;

[0009] The printing device also includes a push rod arranged on the base;

[0010] In the second state, the rotating seat rotates to make the push rod extend into the conveying track, and the cap hanging head is located outside the conveying track. After the push rod pushes the cover body in the conveying track out, the cover body abuts against the guide surface and gradually fits with the cap hanging head under the guidance of the guide surface.

[0011] The frame is provided with a heating device and a driving surface located on one side of the rotating seat, and in the moving direction of the printing device, the conveying device, the heating device and the transfer wheel are arranged in sequence, and the driving surface is located between the rotating seat and the heating device;

[0012] In the third state, the rotating seat rotates to move the cap hanging head within the working area of ​​the heating device, and the cap hanging head abuts against the driving surface and rolls along the driving surface.

[0013] Compared with the prior art, the curved surface printing machine of the present invention can drive the cover body to roll along the transfer wheel without stopping the movement of the rotating seat, and adjust the position difference of the cover body exceeding the transfer wheel caused by the rotation of the rotating seat through the elastic member, so that the cover body is always close to the transfer wheel during printing. After printing is completed, the cover body leaves the transfer wheel, so that printing can be achieved on the cover body without stopping the transfer wheel and the rotating seat, thereby improving the overall working efficiency of the curved surface printing machine.

[0014] Further, a second guide member is provided on the frame, and the second guide member is arranged to extend along the edge of the transfer wheel;

[0015] The base is provided with a guide block, and in the first state, the guide block abuts against the second guide member and moves along the second guide member. When the cover is printing, the guide block and the second guide member can make the base move more stably.

[0016] Furthermore, a guide channel penetrating the cap hanging head is provided in the cap hanging head, and the cap removing mechanism comprises a push rod and a first power assembly, wherein the push rod is movably provided in the guide channel, and the first power assembly drives the push rod to extend out of the guide channel. The cap body hung on the cap hanging head is ejected by the push rod.

[0017] Furthermore, a gas passage penetrating the cap hanging head is provided in the cap hanging head, and the cap removing mechanism comprises an air pipe and an air source connected to the air pipe, and the air pipe is connected to the gas passage, so that the cap body hung on the cap hanging head is pushed out by air pressure.

[0018] Further, the conveying device includes a conveying track and a guide surface, the conveying track is arranged on the frame and located on one side of the rotating seat, the guide surface is arranged at the exit of the conveying track, and in the rotation direction of the rotating seat, the guide surface gradually approaches the cap hanging head;

[0019] The printing device also includes a push rod arranged on the base;

[0020] In the second state, after the rotating seat rotates, the push rod extends into the conveying track, the cap hanging head is located outside the conveying track, and after the push rod pushes the cover body in the conveying track, the cover body abuts against the guide surface and gradually fits with the cap hanging head under the guidance of the guide surface. In this way, the rotating seat can complete the hanging of the cover body on the cap hanging head without stopping.

[0021] Furthermore, the printing device further comprises a third guide and a second power assembly, wherein the third guide is arranged on the base and extends in a direction away from the cap hanging head, the push rod is movably arranged on the third guide, and the second power assembly drives the push rod to move along the third guide. When removing the cap, the push rod can be prevented from interfering with the removal of the cap.

[0022] Further, a fourth guide member is provided on the frame, and the fourth guide member is arranged to extend along the moving path of the base;

[0023] The base is also provided with a guide block, and in the second state, the guide block abuts against the fourth guide member and moves along the fourth guide member. When the cover body is hung, the guide block and the fourth guide member can make the base move more stably.

[0024] Furthermore, the frame is provided with a heating device and a driving surface located on one side of the rotating seat, and in the moving direction of the printing device, the conveying device, the heating device and the transfer wheel are arranged in sequence, and the driving surface is located between the rotating seat and the heating device;

[0025] In the third state, the rotating seat rotates to move the cap hanging head within the working area of ​​the heating device, and the cap hanging head abuts against the driving surface and rolls along the driving surface, so that the cap body can be evenly heated by driving the cap hanging head to rotate.

[0026] Furthermore, the cap hanging head is provided with an annular rack surrounding the cap hanging head, and the driving surface is provided with a rack, and in the third state, the annular rack and the rack are meshed with each other, so that the cap hanging head can be stably driven to rotate through the rack.

[0027] Furthermore, the curved printing machine includes at least four printing devices, which are evenly arranged on the rotating seat around the rotating axis of the rotating seat. After printing is completed, the cover body leaves the transfer wheel, and the rotating seat continues to rotate to drive the next cover body to print, thereby performing non-stop continuous printing, and the four printing devices can respectively enter the first state, the second state, the third state and the cover removal step.

[0028] In order to more clearly understand the present invention, the specific implementation of the present invention will be described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of one side of a curved printing machine according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 The schematic diagram of the local structure of the curved printing machine when the frame is hidden;

[0031] Figure 3 for Figure 1 The structural schematic diagram of the curved printing machine shown in FIG. 1 when the heating device is hidden;

[0032] Figure 4 It is a schematic structural diagram of a push rod of a curved printing machine according to another embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1 , which is a schematic diagram of the structure of one side of a curved printing machine according to an embodiment of the present invention, the curved printing machine includes: a frame 10, a transfer wheel 20 and a rotating seat 30 arranged on the frame 10, a driving device for driving the transfer wheel 20 and the rotating seat 30 to rotate, a plurality of printing devices 40 arranged on the rotating seat 30, a conveying device 50 movably connected to the printing device 40, a printing plate 60 connected to the transfer wheel 20, and an ink system 70 connected to the printing plate 60.

[0035] See also Figure 2 , which is Figure 1The schematic diagram of the partial structure of the curved printing machine when the frame 10 is hidden is shown, the printing device 40 includes a first guide member 41, a base 42, a capping head 43, an elastic member 44 and a capping mechanism, the first guide member 41 is arranged on the rotating seat 30, and extends in the direction away from the rotation axis of the rotating seat 30, the base 42 is movably arranged on the first guide member 41, the capping head 43 is rotatably connected with the base 42, the elastic member 44 is arranged between the capping head 43 and the rotating seat 30, and the capping mechanism is arranged on the rotating seat 30 for separating the capping head 43 from the cover body; in the first state, the cover on the capping head 43 abuts against the wheel surface of the transfer wheel 20, and the rotating seat 30 rotates to make the cover body on the capping head 43 roll along the wheel surface of the transfer wheel 20, and the elastic member 44 is compressed to produce elastic deformation. When the rotating seat 30 rotates, the movement path of the cover body is an arc shape relative to the transfer wheel 20. After the cover body continuously approaches and contacts the transfer wheel 20, the cover body abuts against the wheel surface of the transfer wheel 20. As the rotating seat 30 rotates, the base 42 is pressed toward the rotation axis of the rotating seat 30 by the transfer wheel 20, and the elastic member 44 is compressed to produce elastic deformation. After the cover body moves to the line connecting the rotation center of the transfer wheel 20 and the rotating seat 30, the cover body begins to move away from the transfer wheel 20. At this time, the elastic member 44 pushes the base 42 toward the transfer wheel 20, so that the cover body is still close to the transfer wheel 20 for a displacement until the cover body is separated from the transfer wheel 20. Among them, the distance that the cover body can roll along the wheel surface of the transfer wheel 20 can be adaptively designed in combination with the size of the cover body; in addition, it should be noted that when the cover body rolls along the transfer wheel 20, the transfer wheel 20 is also in a rotating state, and the rotation speed of the rotating wheel can be adjusted according to the rotation speed of the rotating seat 30. It should be noted that the first guide member 41 can be designed according to actual needs in combination with the structure of the base 42. For example, in this embodiment, a guide groove is used, and the base 42 partially extends into the guide groove. Of course, the second guide member 11 can also be a guide rod, a guide channel, etc.

[0036] See also Figure 3 , which is Figure 1 The structural schematic diagram of the curved printing machine when the heating device 80 is hidden is shown. In some optional embodiments, the frame 10 is provided with a second guide member 11, and the second guide member 11 is arranged to extend along the edge of the transfer wheel 20; the base 42 is provided with a guide block 421, and in the first state, the guide block 421 abuts against the second guide member 11 and moves along the second guide member 11. It should be noted that the second guide member 11 can be designed according to actual needs. For example, in this embodiment, a guide groove is used, and the guide block 421 partially or completely extends into the guide groove. Of course, the second guide member 11 can also be a guide block, and the guide block abuts against the guide block 421 for guidance.

[0037] It should be noted that the cover-off mechanism can be designed according to actual needs, for example, according to the structure of the cover body. In some optional embodiments, a gas channel penetrating the cover-off head 43 is provided in the cover-off head 43, and the cover-off mechanism includes an air pipe 45 and an air source connected to the air pipe 45. The air pipe 45 is connected to the air channel, and the cover body on the cover-off head 43 is pushed off by air pressure. Of course, in some optional embodiments, a guide channel penetrating the cover-off head 43 is provided in the cover-off head 43, and the cover-off mechanism includes a push rod and a first power assembly, wherein the push rod is movably arranged in the guide channel, and the first power assembly drives the push rod to extend out of the guide channel, wherein the ejection direction of the push rod is preferably parallel to the direction in which the cover body and the cover-off head 43 are engaged, so as to avoid the cover body from being stuck when the cover is off. It should be noted that the specific structure of the first power assembly can be designed according to actual needs. In this embodiment, a cylinder is used to push the push rod to move. Of course, the first power component can be a screw drive component, a rotary motor translation drive component, a belt translation component, a cylinder translation drive component or a linear motor translation drive component. The working principles of the rotary motor translation drive component, the belt translation component, the cylinder translation drive component or the linear motor translation drive component are the same as discussed above and will not be repeated here.

[0038] In some optional embodiments, the conveying device 50 includes a conveying track 51 and a guide surface 52, wherein the conveying track 51 is arranged on the frame 10 and is located on one side of the rotating seat 30, and the guide surface 52 is arranged at the exit of the conveying track 51, and in the rotation direction of the rotating seat 30, the guide surface 52 gradually approaches the cap hanging head 43; the printing device 40 also includes a push rod 46 arranged on the base 42; in the second state, the rotating seat 30 rotates to make the push rod 46 extend into the conveying track 51, the cap hanging head 43 is located outside the conveying track 51, and after the push rod 46 pushes the cover body in the conveying track 51, the cover body abuts against the guide surface 52, and the push rod 46 continuously pushes the cover body so that the cover body slides along the guide surface 52 and gradually fits with the cap hanging head 43 under the guidance of the guide surface 52. In order to avoid the cover body not contacting the cap hanging head 43 after the push rod 46 pushes the cover body out of the conveying track 51, a supporting surface can be set below the guide surface 52 to prevent the cover body from falling, and the supporting surface is arranged along the moving path of the cap hanging head 43.

[0039] See also Figure 4, which is a schematic diagram of the structure of a push rod 46 of a curved printing machine in another embodiment of the present invention. In some optional embodiments, the printing device 40 further includes a third guide member 47 and a second power assembly 48. The third guide member 47 is arranged on the base 42 and extends in a direction away from the cap hanging head 43. The push rod 46 is movably arranged on the third guide member 47. The second power assembly 48 drives the push rod 46 to move along the third guide member 47. It should be noted that the specific structure of the second power assembly 48 can be designed according to actual needs. In this embodiment, a cylinder is used to push the push rod to move. Of course, the second power assembly 48 can be a screw drive assembly, a rotary motor translation drive assembly, a belt translation assembly, a cylinder translation drive assembly or a linear motor translation drive assembly. The working principle of the rotary motor translation drive assembly, the belt translation assembly, the cylinder translation drive assembly or the linear motor translation drive assembly is the same as that discussed above and will not be described in detail here.

[0040] In some optional embodiments, the frame 10 is provided with a fourth guide member 12, and the fourth guide member 12 is arranged to extend along the moving path of the base 42; the base 42 is also provided with a guide block 421, and in the second state, the guide block 421 abuts against the fourth guide member 12 and moves along the fourth guide member 12. It should be noted that the third guide member 47 can be designed according to actual needs. For example, in this embodiment, a guide groove is used, and the guide block 421 partially or completely extends into the guide groove. Of course, the third guide member 47 can also be a guide block, and the guide block abuts against the guide block 421 for guidance.

[0041] In some optional embodiments, the frame 10 is provided with a heating device 80 (not shown) and a driving surface (not shown) located on one side of the rotating seat 30. In the moving direction of the printing device 40, the conveying device 50, the heating device 80 and the transfer wheel 20 are arranged in sequence, and the driving surface is located between the rotating seat 30 and the heating device 80; in the third state, the rotating seat 30 rotates to make the cap hanging head 43 move within the working area of ​​the heating device 80, and the cap hanging head 43 abuts against the driving surface and rolls along the driving surface. It should be noted that the manner in which the driving surface drives the cap head 43 to rotate can be selected according to actual needs. For example, after the driving surface abuts against the cap head 43, friction is used to drive the cap head 43 to roll. At this time, the driving surface is made of a material with a higher friction coefficient. Of course, in some optional embodiments, the cap head 43 is provided with an annular rack 431 surrounding the cap head 43, and a rack is provided on the driving surface. In the third state, the annular rack 431 and the rack are meshed with each other, and when the cap head 43 moves, it is driven by the rack to rotate.

[0042] In some optional embodiments, the curved printing machine includes four printing devices 40, and the printing devices 40 are evenly arranged on the rotating base 30 around the rotation axis of the rotating base 30. It should be noted that the four printing devices 40 can respectively perform or will perform the first state, the second state, the third state and the decapping step, so that the four printing devices 40 can respectively perform capping, heating, printing and decapping at the same time. Of course, when there are other processing steps or some steps are reduced, the number of printing devices 40 can also be increased or decreased accordingly.

[0043] Compared with the prior art, the curved surface printing machine of the present invention can drive the cover body to roll along the transfer wheel without stopping the movement of the rotating seat, and adjust the position difference of the cover body exceeding the transfer wheel caused by the rotation of the rotating seat through the elastic member, so that the cover body is always close to the transfer wheel during printing. After printing is completed, the cover body leaves the transfer wheel, so that printing can be achieved on the cover body without stopping the transfer wheel and the rotating seat, thereby improving the overall working efficiency of the curved surface printing machine.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A curved surface printing machine, characterized in that: include: A frame, a transfer wheel and a rotating seat arranged on the frame, a driving device for driving the transfer wheel and the rotating seat to rotate, a plurality of printing devices arranged on the rotating seat, a conveying device movably connected to the printing devices, a printing plate matched with the transfer wheel, and an ink system matched with the printing plate; The printing device comprises a first guide, a base, a cap hanging head, an elastic member and a cap removing mechanism, wherein the first guide is arranged on the rotating base and extends in a direction away from the rotating axis of the rotating base, the base is movably arranged on the first guide, the cap hanging head is rotatably connected with the base, the elastic member is arranged between the cap hanging head and the rotating base, and the cap removing mechanism is arranged on the rotating base for separating the cap hanging head from the cover body; In the first state, the cover on the cap hanging head abuts against the wheel surface of the transfer wheel, and the rotating seat rotates to make the cover body on the cap hanging head roll along the wheel surface of the transfer wheel, and the elastic member is compressed to generate elastic deformation; The conveying device includes a conveying track and a guide surface, wherein the conveying track is arranged on the frame and located on one side of the rotating seat, and the guide surface is arranged at the exit of the conveying track, and in the rotating direction of the rotating seat, the guide surface gradually approaches the cap hanging head; The printing device also includes a push rod arranged on the base; In the second state, the rotating seat rotates to make the push rod extend into the conveying track, and the cap hanging head is located outside the conveying track. After the push rod pushes the cover body in the conveying track out, the cover body abuts against the guide surface and gradually fits with the cap hanging head under the guidance of the guide surface. The frame is provided with a heating device and a driving surface located on one side of the rotating seat, and in the moving direction of the printing device, the conveying device, the heating device and the transfer wheel are arranged in sequence, and the driving surface is located between the rotating seat and the heating device; In the third state, the rotating seat rotates to move the cap hanging head within the working area of ​​the heating device, and the cap hanging head abuts against the driving surface and rolls along the driving surface.

2. A curved surface printing machine according to claim 1, characterized in that: The frame is provided with a second guide member, and the second guide member is arranged to extend along the edge of the transfer wheel; A guide block is disposed on the base. In the first state, the guide block abuts against the second guide member and moves along the second guide member.

3. The curved surface printing machine according to claim 1, characterized in that: A guide channel penetrating the cap hanging head is arranged in the cap hanging head, and the cap removing mechanism comprises a push rod and a first power assembly, the push rod is movably arranged in the guide channel, and the first power assembly drives the push rod to extend out of the guide channel.

4. The curved surface printing machine according to claim 1, characterized in that: A gas passage penetrating the cap hanging head is arranged in the cap hanging head, and the cap removing mechanism comprises an air pipe and an air source connected to the air pipe, and the air pipe is connected to the gas passage.

5. The curved surface printing machine according to claim 1, characterized in that: The printing device also includes a third guide member and a second power assembly. The third guide member is arranged on the base and extends in a direction away from the cap hanging head. The push rod is movably arranged on the third guide member. The second power assembly drives the push rod to move along the third guide member.

6. The curved surface printing machine according to claim 1, characterized in that: The frame is provided with a fourth guide member, and the fourth guide member is arranged to extend along the moving path of the base; The base is also provided with a guide block, and in the second state, the guide block abuts against the fourth guide member and moves along the fourth guide member.

7. The curved surface printing machine according to claim 1, characterized in that: The cap hanging head is provided with an annular rack surrounding the cap hanging head, and the driving surface is provided with a rack. In the third state, the annular rack and the rack are meshed with each other.

8. The curved surface printing machine according to claim 1, characterized in that: The curved surface printing machine comprises at least four printing devices, and the printing devices are evenly arranged on the rotating base around the rotating axis of the rotating base.

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