Transfer printing device and transfer printing process

Abstract

The invention relates to the technical field of printing, and discloses a transfer printing device and a transfer printing technology.The transfer printing device comprises a first transfer printing unit and a second transfer printing unit, the first transfer printing unit comprises a first roll shaft structure and a first positioning assembly, the outer side wall of the first roll shaft structure is wrapped with an ink bearing base part, the ink bearing base part is elastically arranged, and the first positioning assembly is suitable for recognizing the rotation angle of the ink bearing base part; the jet printing assembly is arranged on the outer side of the ink bearing base part in a surrounding mode, is spaced from the ink bearing base part and is suitable for spraying patterns to the ink bearing base part; the second transfer printing unit comprises a second roll shaft structure and a second positioning assembly, the second roll shaft structure is parallel to the first roll shaft structure, the second roll shaft structure is suitable for being connected with the printing stock in a limiting mode, and the second positioning assembly is suitable for recognizing the rotation angle of the printing stock; the first driving assembly is at least connected with one of the first roll shaft structure and the second roll shaft structure in a matched mode and is suitable for driving the first driving assembly to rotate in the circumferential direction; and the second driving assembly is at least connected with one of the first roller shaft structure and the second roller shaft structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of printing technology, in particular to a pad printing device and a pad printing process. BACKGROUND

[0002] At present, for daily-use ceramic, such as cups, bowls and the like, the surface printing process generally adopts pad printing process. The pad printing process needs to first set a pattern with a certain depth on a substrate to make a concave plate, then fill the pattern with ink, and use a curved pad printing head made of silica gel material to dip the ink on the concave plate to the surface of the pad printing head. By pressing the pad printing head on the surface of the object to be printed, the pattern or text can be printed on the curved surface.

[0003] This process can realize printing on various curved surfaces. However, every time the pattern is changed, the concave plate needs to be re-made, which is costly. In addition, when multiple colors of patterns are needed, not only multiple single-color concave plates need to be made, but also multiple stations are needed to print the patterns, which is complicated and has low operation flexibility, and color position errors are prone to occur. SUMMARY

[0004] Therefore, the present application provides a pad printing device and a pad printing process to solve the problems of high cost, complicated process and prone to errors of the existing pad printing process.

[0005] In a first aspect, the present application provides a pad printing device, comprising: a first pad printing unit, comprising a first roller structure and a first positioning assembly, an ink-accepting base is wrapped on the outer side wall of the first roller structure, the ink-accepting base is elastically arranged, and the first positioning assembly is adapted to identify the rotation angle of the ink-accepting base; a spray printing assembly, which is wrapped outside the ink-accepting base and is arranged in a spaced manner with the ink-accepting base, is adapted to spray patterns on the ink-accepting base; a second pad printing unit, comprising a second roller structure and a second positioning assembly, the second roller structure is parallel to the first roller structure, the second roller structure is adapted to limit the connection of the printing object, and the second positioning assembly is adapted to identify the rotation angle of the printing object; a first driving assembly, which is cooperatively connected with at least one of the first roller structure and the second roller structure, is adapted to drive the rotation of the first roller structure and the second roller structure along the circumferential direction thereof; and a second driving assembly, which is connected with at least one of the first roller structure and the second roller structure, has a working state of driving the first roller structure and the second roller structure to approach each other so that the ink-accepting base abuts against the printing object, and a standby state of driving the first roller structure and the second roller structure to move away from each other.

[0006] Advantages:

[0007] The ink-accepting base for spraying and the printing object for carrying a pad printing pattern are arranged on the two roller shaft structures respectively, and the pattern transfer from the ink-accepting base to the printing object is realized by the abutment and synchronous rotation of the two roller shaft structures under the driving of the first driving assembly and the second driving assembly. In this way, the ink-accepting base on the first roller shaft structure is directly sprayed by the spraying assembly, and when the pattern needs to be changed, the sprayed pattern is changed, without the need to arrange multiple concave plates or replace the ink-accepting base, thereby saving materials and reducing costs.

[0008] Meanwhile, when a multi-color pattern is transferred, the entire multi-color pattern is sprayed on the ink-accepting base by the spraying assembly at one time, without the need to make multiple single-color concave plates for overprinting, thereby simplifying the process, improving work efficiency, and improving the precision and reducing the error of single-molding patterns.

[0009] In an optional embodiment, the first positioning assembly comprises: a first detection member, which is communicatively connected with the spraying assembly, the first driving assembly and the second driving assembly, and is arranged in a spaced manner with the first roller shaft structure; and at least one first trigger site, which is arranged in a circumferential distribution along the outer sidewall of the first roller shaft structure and / or the ink-accepting base. The first detection member is adapted to detect the position of the first trigger site.

[0010] In an optional embodiment, the second positioning assembly comprises: a second detection member, which is communicatively connected with the spraying assembly, the first driving assembly and the second driving assembly, and is arranged in a spaced manner with the second roller shaft structure; and at least one second trigger site, which is arranged in a circumferential distribution along the outer sidewall of the second roller shaft structure. The second detection member is adapted to detect the position of the second trigger site.

[0011] In an optional embodiment, the spraying assembly comprises a plurality of single-color spraying units, and the single-color spraying units are arranged in a circumferential distribution one by one along the ink-accepting base.

[0012] In an optional embodiment, the pad printing device further comprises: an avoidance groove arranged on at least the ink-accepting base and opening in a direction away from the axis of the first roller shaft structure, and adapted to avoid the to-be-avoided protrusion on the printing object.

[0013] In an optional embodiment, the avoidance groove is provided with the first trigger site at a projection position of the first roller shaft structure, and / or the to-be-avoided protrusion is provided with the second trigger site at a projection position of the second roller shaft structure.

[0014] In an optional embodiment, the pad printing device further comprises: a controller, which is communicatively connected with the spraying assembly, the first driving assembly, the second driving assembly, the first positioning assembly and the second positioning assembly respectively.

[0015] In the second aspect, the present application further provides a pad printing process, comprising: obtaining position information of a pad base, and spraying a corresponding pattern on the pad base; driving the pad base to rotate to a second preset angle; driving a first roller structure carrying the pad base to approach a second roller structure carrying a printing object, so that the pad base abuts against the printing object; driving the first roller structure to rotate by a third preset angle, and synchronously driving the second roller structure to rotate, so that the pattern on the pad base is transferred to the printing object.

[0016] In an optional embodiment, the step of "spraying a corresponding pattern on the pad base outside the first roller structure" comprises: driving the first roller structure to rotate, and spraying the pattern on the rotating pad base; and stopping the spraying when the first roller structure rotates to a first preset angle.

[0017] In an optional embodiment, before the step of "driving the first roller structure carrying the pad base to approach the second roller structure carrying the printing object", the process further comprises: obtaining position information of the second roller structure; and driving the second roller structure and the printing object thereon to rotate to a pad printing angle.

[0018] In an optional embodiment, before the step of "obtaining position information of the first roller structure", the process further comprises: judging whether the printing object is provided with a to-be-avoided protrusion; if yes, corresponding to the first roller structure provided with an avoiding slot; and if not, corresponding to the first roller structure not provided with the avoiding slot.

[0019] In an optional embodiment, after the step of "driving the first roller structure to rotate by a third preset angle, and synchronously driving the second roller structure to rotate", the process further comprises: driving the first roller structure and the second roller structure to move away from each other, so as to reset the first roller structure and the second roller structure. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0021] Figure 1 FIG. 1 is a structural schematic diagram of a pad printing device according to an embodiment of the present application;

[0022] Figure 2 FIG. 2 is a structural schematic diagram of another embodiment of the pad printing device shown in FIG. 1; Figure 1 FIG. 3 is a structural schematic diagram of another embodiment of the pad printing device shown in FIG. 1 at step S1;

[0023] Figure 3 FIG. 4 is a structural schematic diagram of another embodiment of the pad printing device shown in FIG. 1 at step S2; Figure 2The structure schematic diagram of the pad printing device in step S2 is shown.

[0024] Figure 4 For Figure 2 The structure schematic diagram of the pad printing device in step S3 is shown.

[0025] Figure 5 For Figure 2 The structure schematic diagram of the pad printing device in step S4 is shown.

[0026] Figure 6 For Figure 2 The structure schematic diagram of the pad printing device in step S5 is shown.

[0027] Explanation of reference signs:

[0028] 1, first roller structure; 2, ink-accepting base; 21, avoiding groove; 3, first positioning assembly; 31, first detection piece; 32, first trigger point; 4, jet printing assembly; 41, single-color jet printing unit; 5, second roller structure; 6, second positioning assembly; 61, second detection piece; 62, second trigger point; 7, printing object; 71, to-be-avoided protrusion. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0030] As Figures 1-6 In a first aspect, the present application provides a pad printing device, comprising: a first pad printing unit, a jet printing assembly 4, a second pad printing unit, a first driving assembly and a second driving assembly.

[0031] The first pad printing unit comprises a first roller structure 1 and a first positioning assembly 3.

[0032] The first roller shaft structure 1 is specifically a single shaft roller, and as an alternative implementation, it can also be two or more. The outer side wall of the first roller shaft structure 1 is wrapped with an ink bearing base 2, which is connected to each other, and can be adhesive or interference fit. The ink bearing base 2 is an elastic member, preferably made of silicone material, used to carry the track of the inkjet assembly 4. The elastic member allows the ink bearing base 2 to adapt to the small deformation of the outer wall shape of the printing substrate 7 during the transfer process, facilitating accurate transfer. The first positioning assembly 3 is used to identify the rotation angle of the ink bearing base 2. In this embodiment, the first positioning assembly 3 indirectly identifies the rotation angle of the ink bearing base 2 by identifying the rotation angle of the first roller shaft structure 1. It can be understood that the rotation angle of the ink bearing base 2 can also be directly identified.

[0033] The inkjet assembly 4 is open towards the ink bearing base 2 and surrounds the outer side of the ink bearing base 2, and is spaced apart from the ink bearing base 2, and is suitable for spraying patterns to the outer side of the ink bearing base 2. Preferably, the nozzle of the inkjet assembly 4 is fixed in distance from the axis of the first roller shaft structure 1, and the distance between the inkjet assembly 4 and the ink bearing base 2 is adaptively adjusted according to the need of inkjet. It can be understood that the distance between the nozzle of the inkjet assembly 4 and the surface of the ink bearing base 2 can also be set as a fixed value. In this embodiment, the inkjet assembly 4 is movably connected with the first pad printing unit, the first roller shaft structure 1 is adapted to rotate relative to the inkjet assembly 4 under the drive of the first drive assembly, and is adapted to move together with the inkjet assembly 4 under the drive of the second drive assembly. As an alternative implementation, the inkjet assembly 4 can also be separately provided from the first pad printing unit.

[0034] The second pad printing unit includes a second roller shaft structure 5 and a second positioning assembly 6.

[0035] The second roller shaft structure 5 corresponds to the first roller shaft structure 1, and is also a single shaft roller. As an alternative implementation, it can also be two or more. The printing substrate 7 is detachably limited and connected to the second roller shaft structure 5. Specifically, the printing substrate 7 can be correspondingly adhered to the shaft end of the second roller shaft structure 5, or fitted on the outer side of the second roller shaft structure 5. In addition, the second roller shaft structure 5 is parallel to the first roller shaft structure 1, facilitating transmission by rotation, thereby meeting the transfer needs. Since the second positioning assembly 6 is adapted to identify the rotation angle of the printing substrate 7, in this embodiment, the second positioning assembly 6 indirectly identifies the rotation angle of the printing substrate 7 by identifying the rotation angle of the second roller shaft structure 5. It can be understood that the rotation angle of the printing substrate 7 can also be directly identified.

[0036] The first driving assembly is connected with the first pad printing unit, and specifically, the first driving assembly is connected with the first roller shaft structure 1 and is adapted to drive the first roller shaft structure 1 to rotate in the circumferential direction. As an alternative embodiment, the first driving assembly can be connected with the second roller shaft structure 5 and drive the second roller shaft structure 5 to rotate in the circumferential direction of the second roller shaft structure 5, or the first driving assembly can be connected with both the first roller shaft structure 1 and the second roller shaft structure 5 and drive both to rotate in the circumferential direction of each. Specifically, the first driving assembly can be a single or multiple driving motor, such as a step motor.

[0037] The second driving assembly has a working state and a standby state.

[0038] In the embodiment, the second driving assembly is connected with the second roller shaft structure 5. In the working state, the second driving assembly drives the second roller shaft structure 5 to move towards the first roller shaft structure 1, so that the first roller shaft structure 1 and the second roller shaft structure 5 are close to each other, and the second driving assembly stops driving when the ink receiving base 2 abuts against the printing object 7, and the second roller shaft structure 5 stops moving. In the standby state, the second driving assembly drives the second roller shaft structure 5 to move away from the first roller shaft structure 1, so that the first roller shaft structure 1 and the second roller shaft structure 5 are far away from each other. The second driving assembly can be a single or multiple driving motor, such as a step motor.

[0039] As an alternative embodiment, the second driving assembly can be connected with the first roller shaft structure 1. In the working state, the second driving assembly drives the first roller shaft structure 1 to move towards the second roller shaft structure 5, and in the standby state, the second driving assembly drives the first roller shaft structure 1 to move away from the second roller shaft structure 5.

[0040] As another alternative embodiment, the second driving assembly is connected with both the first roller shaft structure 1 and the second roller shaft structure 5. In the working state, the second driving assembly drives the first roller shaft structure 1 and the second roller shaft structure 5 to move close to each other, and the second driving assembly stops driving when the ink receiving base 2 abuts against the printing object 7, and the first roller shaft structure 1 and the second roller shaft structure 5 stop moving. Specifically, in the working state, the first roller shaft structure 1 and the second roller shaft structure 5 specifically move towards each other. In the standby state, the second driving assembly drives the first roller shaft structure 1 and the second roller shaft structure 5 to move away from each other. Specifically, in the standby state, the first roller shaft structure 1 and the second roller shaft structure 5 specifically move away from each other. In addition, in the working state or the standby state, the first roller shaft structure 1 and the second roller shaft structure 5 can move in the same direction, and only have a speed difference.

[0041] The ink-accepting base 2 carrying the sprayed pattern and the print 7 carrying the pad-printed pattern are respectively arranged on the two roller shaft structures, and the pattern transfer from the ink-accepting base 2 to the print 7 is realized by the abutment and synchronous rotation of the two roller shaft structures under the driving of the first driving assembly and the second driving assembly. In this way, the ink-accepting base 2 is directly sprayed on the first roller shaft structure 1 by the spray printing assembly 4, and when the pattern needs to be changed, the sprayed pattern is changed, without the need to arrange multiple concave plates or replace the ink-accepting base 2, thereby saving materials and reducing costs.

[0042] Meanwhile, when transferring a multi-color pattern, the entire multi-color pattern is only sprayed on the ink-accepting base 2 by the spray printing assembly 4 once, without the need to make multiple single-color concave plates for overprinting, thereby simplifying the process, improving work efficiency, and improving the precision and reducing the error of single-molding patterns.

[0043] In addition, the first positioning assembly 3 includes a first detection member 31 and a first trigger point 32.

[0044] The first detection member 31 is respectively in communication connection with the spray printing assembly 4, the first driving assembly and the second driving assembly, and is arranged in a spaced manner with the first roller shaft structure 1, and the first detection member 31 is adapted to detect the position of the first trigger point 32. Specifically, the first detection member 31 is a sensor, such as a photoelectric sensor.

[0045] In the embodiment, the number of the first trigger point 32 is single, and two or more can also be arranged, and the first trigger point 32 is arranged in a circumferential distribution along the outer side wall of the first roller shaft structure 1, and the specific arrangement position can be adjusted according to the spraying needs, and in the embodiment, the ink-accepting base 2 is tubular and does not completely cover the outer side wall of the first roller shaft structure 1, and the first trigger point 32 is arranged on the exposed outer side wall of the first roller shaft structure 1, and it can be understood that it can also be arranged in a circumferential distribution along the outer side wall of the ink-accepting base 2.

[0046] The first positioning assembly 3 can meet the detection of the rotation angle of the first roller shaft structure 1 or the ink-accepting base 2, and improve the accuracy of the sprayed pattern and the transferred pattern.

[0047] As a convertible embodiment, the first positioning assembly 3 can include a plurality of uniformly distributed first trigger points 32 and be provided with corresponding marks, and the rotation angle of the first roller shaft structure 1 or the ink-accepting base 2 is identified by manual identification.

[0048] Further, the second positioning assembly 6 includes a second detection member 61 and a second trigger point 62.

[0049] The second detection member 61 is respectively in communication connection with the jet printing assembly 4, the second driving assembly, and the second driving assembly, and is spaced apart from the second roller structure 5. The second detection member 61 is adapted to detect the position of the second trigger site 62. Specifically, the second detection member 61 is a sensor, such as a photoelectric sensor or the like. In the embodiment, the number of the second trigger site 62 is single, and two or more second trigger sites 62 can also be provided. The second trigger site 62 is arranged in a circumferential distribution along the outer side wall of the second roller structure 5.

[0050] By providing the second positioning assembly 6, the rotation angle of the second roller structure 5 or the print substrate 7 can be detected, and the accuracy of the jet printing pattern and the transfer printing pattern can be improved.

[0051] As a convertible embodiment, the second positioning assembly 6 can include a plurality of uniformly distributed second trigger sites 62, and is provided with corresponding marks. The rotation angle of the second roller structure 5 or the print substrate 7 can be identified by manual identification.

[0052] In addition, the jet printing assembly 4 includes a plurality of single-color jet printing units 41. Each single-color jet printing unit 41 can be different from each other. The plurality of single-color jet printing units 41 are connected to each other and arranged in a circumferential distribution along the ink-accepting base 2.

[0053] Further preferably, the jet printing assembly 4 is detachably connected to the first pad printing unit. The arrangement position and the spraying shape of the single-color jet printing unit 41 in the jet printing assembly 4 are adjustable. This arrangement facilitates the replacement of different jet printing assemblies 4 as needed, realizes the adjustment of the jet printing image, and has low cost and simple steps.

[0054] In some embodiments, the pad printing device includes an avoidance slot 21.

[0055] The avoidance slot 21 is arranged on the ink-accepting base 2. Understandably, the avoidance slot 21 can also extend to the first roller structure 1. The avoidance slot 21 can be an arc slot or a square slot, and has an opening facing away from the central axis of the first roller structure 1. The avoidance slot 21 is used to avoid the avoidance position protrusion 71 on the print substrate 7. The avoidance position protrusion 71 is specifically a protruding structure at a position on the print substrate 7 that does not need to be transferred. When the print substrate 7 rotates with the second roller structure 5, the protruding structure will contact the ink-accepting base 2, causing the ink-accepting base 2 to be deformed in a large concave shape, and causing a pattern vacancy to appear at a position on the print substrate 7 that needs to be transferred, such as a cup handle structure of a cup. By providing the avoidance slot 21, the large protruding structure on the print substrate 7 is avoided to interfere with the transfer printing, and the smooth progress of the transfer printing process is ensured.

[0056] As a convertible embodiment, when the print substrate 7 is provided with the avoidance position protrusion 71, the avoidance slot 21 can also not be provided.

[0057] Preferably, when the pad printing device comprises the avoidance groove 21, the avoidance groove 21 is provided with the first trigger point 32 at the projected position on the first roller structure 1, and the avoidance position protrusion 71 is provided with the second trigger point 62 at the projected position on the second roller structure 5. At these positions, the trigger points facilitate the calculation of the position of the avoidance groove 21 or the avoidance position protrusion 71 based on the trigger points, and facilitate the accurate alignment of the avoidance and the accurate transfer. As a transformable embodiment, only the avoidance groove 21 can be provided with the first trigger point 32 at the projected position on the first roller structure 1, or only the avoidance position protrusion 71 can be provided with the second trigger point 62 at the projected position on the second roller structure 5.

[0058] As another transformable embodiment, the relative circumferential angle of the first trigger point 32 and the avoidance groove 21 is a fixed value, and the relative circumferential angle of the second trigger point 62 and the avoidance position protrusion 71 is a fixed value.

[0059] Preferably, the pad printing device further comprises a controller, which can be a single-chip microcomputer, a PLC, a PC, or the like, and is in communication connection with the inkjet assembly 4, the first driving assembly, the second driving assembly, the first positioning assembly 3, and the second positioning assembly 6, respectively. The controller is built-in with a counter and the like, and can control the working time and working opportunity of each assembly through the number and total amount proportion of servo pulse signals.

[0060] In a second aspect, the present application provides a transfer printing process, which is applicable to at least the above-mentioned pad printing device, comprising:

[0061] S1. Obtain the position information of the ink-accepting base 2 corresponding to the spraying pattern on the ink-accepting base 2.

[0062] S2. Drive the ink-accepting base 2 to rotate to a second preset angle;

[0063] S3. Drive the first roller structure 1 carrying the ink-accepting base 2 and the second roller structure 5 carrying the printing object 7 to approach each other, so that the ink-accepting base 2 abuts against the printing object 7; in the present embodiment, there is a preset length of interval between the first roller structure 1 and the second roller structure 5 before the movement of the two roller structures. In addition, the relative movement of the two roller structures, wherein the driven main body can be either one of or both of the first roller structure 1 and the second roller structure 5.

[0064] S4. Drive the first roller structure 1 to rotate by a third preset angle, and drive the second roller structure 5 to rotate synchronously, so as to transfer the pattern on the ink-accepting base 2 to the printing object 7.

[0065] In the present embodiment, S1, S2, S3, and S4 are sequentially performed, and as a transformable embodiment, step S2 and step S3 can be performed synchronously.

[0066] The pattern is sprayed on the ink-accepting base 2 of the first roller structure 1, and the pattern is transferred from the ink-accepting base 2 to the printing material 7 through the abutment and synchronous rotation of the two roller structures. The direct spraying method facilitates the replacement of the transferred pattern, does not require the setting of multiple concave plates or the replacement of the ink-accepting base 2, saves materials, has a lower cost, does not require overprinting for multi-color patterns, has a simple process, has a high work efficiency, and has a single pattern forming, high precision, and small error.

[0067] In step S1, the position information of the ink-accepting base 2 is obtained.

[0068] In this embodiment, the ink-accepting base 2 is synchronously rotated and moved with the first roller structure 1, the position of the first roller structure 1 is recognized by the first detection member 31 of the first positioning assembly 3, and then the position information of the ink-accepting base 2 carried by the first roller structure 1 is indirectly obtained. The position information refers to the angle turned by the ink-accepting base 2 relative to the positioning base. Specifically, the positioning base refers to the first trigger point 32 to be set or a selected first trigger point 32. Further, the position information can also include the real-time distance information between the ink-accepting base 2 and the printing material 7. This information can be obtained by setting the second driving assembly to drive the first roller structure 1 and the second roller structure 5 to move at a preset fixed speed, combining the controller to control the proportion of the number of pulse signals to the total number of pulse signals required for the preset length, and determining the real-time distance between the ink-accepting base 2 and the printing material 7.

[0069] As a convertible embodiment, the position information of the ink-accepting base 2 can also be detected by additional position sensors, angle sensors, etc.

[0070] In step S1, the corresponding pattern is sprayed on the ink-accepting base 2 outside the first roller structure 1, which includes:

[0071] S11. Drive the first roller structure 1 to rotate, and at the same time, spray a pattern on the rotating ink-accepting base 2.

[0072] S12. The first roller structure 1 is rotated to a first preset angle, and the spraying is stopped. The value of the first preset angle can be adjusted according to the different patterns required to be sprayed by the spraying assembly 4. In this embodiment, the main body driving the first roller structure 1 to rotate is the first driving assembly, and the main body of the spraying is the spraying assembly 4.

[0073] As a convertible embodiment, before step S11, step S10 is further included: driving the first roller structure 1 to roll back to the preset starting position of the spraying assembly 4 on the ink-accepting base 2. This setting can be matched with the avoidance groove 21, or in the case of continuous multiple transfer, it ensures the accuracy of the transfer and avoids the problem of misalignment and overlapping of residual ink and subsequent sprayed patterns.

[0074] Step S2. Drive the ink-accepting base 2 to rotate to a second preset angle. The main body driving the ink-accepting base 2 to rotate is the first driving assembly, which indirectly realizes the rotation driving of the ink-accepting base 2 through the driving of the first roller shaft structure 1. As a transformable embodiment, the ink-accepting base 2 only synchronously moves with the first roller shaft structure 1, and the ink-accepting base 2 can relatively rotate with the first roller shaft structure 1, both of which are movably sleeved, and the ink-accepting base 2 is connected with the first driving assembly.

[0075] Before step S3, it further includes: A1. Obtain the position information of the second roller shaft structure 5; A2. Drive the second roller shaft structure 5 and the printing substrate 7 thereon to rotate to a to-be-transferred angle. In addition, steps A1 and A2 can be performed synchronously with steps S1 and S2.

[0076] In the embodiment, the printing substrate 7 synchronously rotates and moves with the second roller shaft structure 5, the position of the second roller shaft structure 5 is recognized by the second detection piece 61 of the second positioning assembly 6, and then the position information of the printing substrate 7 carried thereby is indirectly obtained. The position information of the printing substrate 7 refers to the angle rotated by the printing substrate 7 relative to a positioning base. Specifically, the positioning base refers to a single second trigger site 62 or a selected one of the second trigger sites 62. Similarly, the position information can also include the real-time distance information between the ink-accepting base 2 and the printing substrate 7.

[0077] The main body driving the second roller shaft structure 5 and the printing substrate 7 thereon to rotate is the first driving assembly, which indirectly realizes the rotation driving of the printing substrate 7 through the driving of the second roller shaft structure 5. As a transformable embodiment, the printing substrate 7 only synchronously moves with the second roller shaft structure 5, and the printing substrate 7 can relatively rotate with the second roller shaft structure 5, both of which are movably connected, and the printing substrate 7 is connected with the first driving assembly.

[0078] Preferably, before step S1 “obtain the position information of the first roller shaft structure 1”, it further includes:

[0079] S01. Determine whether the printing substrate 7 is provided with a to-be-avoided protrusion 71;

[0080] S02. If yes, correspondingly select the first roller shaft structure 1 with the avoiding groove 21, and if not, correspondingly select the first roller shaft structure 1 without the avoiding groove 21.

[0081] Through the selection of the first roller shaft structure 1, the printing substrate 7 with the to-be-avoided protrusion 71 can be transferred, and the transfer failure can be avoided. As a transformable embodiment, only the first roller shaft structure 1 with the avoiding groove 21 can be used.

[0082] In step S3, the ink-accepting base 2 abuts against the printing material 7. In the present embodiment, the controller determines whether the ink-accepting base 2 has abutted against the printing material 7 by determining whether the ratio of the number of pulses used to control the second driving device to drive the first roller structure 1 to move by a preset length to the total number of pulses required to move by the preset length is equal to one. As a variant, the pressure sensor can be arranged between the first roller structure 1 and the ink-accepting base 2 to measure the pressure.

[0083] In step S4, the first roller structure 1 drives the second roller structure 5 to rotate synchronously. As a variant, the first roller structure 1 and the second roller structure 5 can be driven by the first driving assembly, respectively.

[0084] In addition, the third preset angle can be the angle at which the ink-accepting base 2 completes the transfer of the pattern to the printing material 7. In this case, the third preset angle can be identified by the first positioning assembly 3. As a variant, the third preset angle can be the angle at which the ink-accepting base 2 rotates after the printing material 7 rotates one revolution. In this case, the third preset angle can be identified by the second positioning assembly 6 or the controller can determine whether the ratio of the number of pulses corresponding to the real-time rotation of the printing material 7 to the number of pulses corresponding to one revolution of the printing material 7 is equal to one.

[0085] In addition, after step S4, the method further comprises:

[0086] S5. The first roller structure 1 and the second roller structure 5 are driven to move away from each other so as to reset the first roller structure 1 and the second roller structure 5. Specifically, the first driving assembly drives the first roller structure 1 and the second roller structure 5 to move towards each other and to move away from each other.

[0087] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope of the appended claims.

Claims

1. Pad printing apparatus, characterized in that The device comprises: a first pad printing unit, comprising a first roller structure (1) and a first positioning assembly (3), an ink-accepting base (2) is arranged on the outer side wall of the first roller structure (1), the ink-accepting base (2) is elastically arranged, and the first positioning assembly (3) is suitable for identifying the rotation angle of the ink-accepting base (2); a spraying assembly (4) is arranged outside the ink-accepting base (2) and is spaced apart from the ink-accepting base (2), and is suitable for spraying patterns on the ink-accepting base (2); a second pad printing unit, comprising a second roller structure (5) and a second positioning assembly (6), the second roller structure (5) is parallel to the first roller structure (1), the second roller structure (5) is suitable for limiting the connection of the printing object (7), and the second positioning assembly (6) is suitable for identifying the rotation angle of the printing object (7); a first driving assembly is connected with at least one of the first roller structure (1) and the second roller structure (5), and is suitable for driving the rotation of the first roller structure (1) and the second roller structure (5) along the circumferential direction thereof; a second driving assembly is connected with at least one of the first roller structure (1) and the second roller structure (5), and has a working state of driving the first roller structure (1) and the second roller structure (5) to approach each other so that the ink-accepting base (2) abuts against the printing object (7), and a standby state of driving the first roller structure (1) and the second roller structure (5) to move away from each other.

2. Pad printing apparatus according to claim 1, characterized in that The first positioning assembly (3) comprises: a first detection member (31) is in communication connection with the spraying assembly (4), the first driving assembly and the second driving assembly, and is spaced apart from the first roller structure (1); at least one first trigger point (32) is arranged along the circumferential direction of the outer side wall of the first roller structure (1) and / or the ink-accepting base (2), and the first detection member (31) is suitable for detecting the position of the first trigger point (32).

3. Pad printing apparatus according to claim 1, characterized in that The second positioning assembly (6) comprises: a second detection member (61) is in communication connection with the spraying assembly (4), the first driving assembly and the second driving assembly, and is spaced apart from the second roller structure (5); at least one second trigger point (62) is arranged along the circumferential direction of the second roller structure (5), and the second detection member (61) is suitable for detecting the position of the second trigger point (62).

4. The pad printing apparatus of claim 1, wherein The spraying assembly (4) comprises a plurality of single-color spraying units (41), and the single-color spraying units (41) are arranged one by one along the circumferential direction of the ink-accepting base (2).

5. Pad printing device according to any of claims 1 to 4, characterized in that Further comprising: an avoidance groove (21) is arranged on at least the ink-accepting base (2) and is opened in a direction away from the axis of the first roller structure (1), and is suitable for avoiding the avoidance position protrusion (71) on the printing object (7).

6. The pad printing device according to claim 5, wherein the avoidance groove (21) is provided with a first trigger point (32) at the projection position on the first roller structure (1); and / or, The second trigger point (62) is arranged at the projection position of the avoidance bit protrusion (71) on the second roller shaft structure (5).

7. Pad printing apparatus according to any of claims 1 to 4, 6, characterized in that Further comprising: A controller is in communication connection with the inkjet printing assembly (4), the first driving assembly, the second driving assembly, the first positioning assembly (3) and the second positioning assembly (6) respectively.

8. A process for transfer printing, characterised in that, Including: Obtaining position information of the ink-accepting base (2) corresponding to the spraying pattern on the ink-accepting base (2); Driving the ink-accepting base (2) to rotate to a second preset angle; Driving the first roller shaft structure (1) carrying the ink-accepting base (2) to approach the second roller shaft structure (5) carrying the printing material (7) to make the ink-accepting base (2) abut against the printing material (7); Driving the first roller shaft structure (1) to rotate by a third preset angle, and the second roller shaft structure (5) rotates synchronously to make the pattern on the ink-accepting base (2) transfer printed on the printing material (7).

9. The process according to claim 8, characterized in that The step of "spraying a corresponding pattern on the ink-accepting base (2) outside the first roller shaft structure (1)" comprises: Driving the first roller shaft structure (1) to rotate, and spraying a pattern on the rotating ink-accepting base (2) at the same time; The first roller shaft structure (1) rotates to a first preset angle, and the spraying is stopped.

10. The process according to claim 8, characterized in that Before the step of "driving the first roller shaft structure (1) carrying the ink-accepting base (2) to approach the second roller shaft structure (5) carrying the printing material (7)", further comprising: Obtaining position information of the second roller shaft structure (5); Driving the second roller shaft structure (5) and the printing material (7) thereon to rotate to a transfer printing angle.

11. The process according to any one of claims 8 to 10, characterized in that, Before the step of "obtaining position information of the first roller shaft structure (1)", further comprising: Judging whether the printing material (7) is provided with an avoidance bit protrusion (71); If yes, a first roller shaft structure (1) with an avoidance slot (21) is selected, and if not, a first roller shaft structure (1) without an avoidance slot (21) is selected.

12. The process according to any one of claims 8-10, characterized in that, After the step of "driving the first roller shaft structure (1) to rotate by a third preset angle, and driving the second roller shaft structure (5) to rotate synchronously", further comprising: Driving the first roller shaft structure (1) and the second roller shaft structure (5) to move away from each other to reset the first roller shaft structure (1) and the second roller shaft structure (5).

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