UV local cold stamp printing device with positioning function

Abstract

This invention relates to the field of cold foil stamping technology, and more particularly to a UV partial cold foil stamping device with positioning function. It includes a frame, a substrate unwinding shaft rotatably connected to one side of the frame, a traction roller assembly rotatably connected to the upper part of the frame, the traction roller assembly being located behind the substrate unwinding shaft along the conveying direction, a substrate rewinding shaft rotatably connected to the other side of the frame, a cold foil unwinding shaft and a cold foil rewinding shaft rotatably connected to the upper side of the frame, an upper impression roller and a lower impression roller rotatably connected to the middle of the frame, and a UV curing lamp fixedly installed on the downstream side of the frame. This invention establishes a lateral mechanical reference for the substrate through a side positioning retaining ring, and simultaneously constrains the lateral position of the cold foil through an axially adjustable retaining ring, achieving bidirectional lateral positioning of the substrate and the cold foil. This avoids lateral offset of the stamping pattern caused by roll material misalignment, ensuring the alignment accuracy of the pattern in the width direction of the substrate.

Description

Technical Field

[0001] This invention relates to the field of cold foil stamping technology, and more particularly to a UV spot cold foil stamping apparatus with positioning function. Background Technology

[0002] Cold foil stamping is a printing process that uses UV-cured adhesives to transfer the metallic coating on cold foil to the surface of the substrate. It is widely used in high-end printing fields such as packaging and labeling. Compared with traditional hot foil stamping, cold foil stamping does not require heating and has advantages such as low energy consumption, good safety, and wide applicability.

[0003] Existing UV spot cold foil printing equipment typically includes a frame, substrate unwinding shaft, traction roller group, substrate rewinding shaft, cold foil unwinding shaft, cold foil rewinding shaft, upper impression roller, lower impression roller, and UV curing lamp. During operation, the substrate is released from the unwinding shaft and drawn into the printing area between the upper and lower printing rollers by the traction roller group. At the same time, the cold foil is released from the unwinding shaft and also enters the printing area. The surface of the substrate is pre-coated with UV adhesive. Under the pressure of the printing rollers, the cold foil adheres to the substrate. Subsequently, the adhesive is cured by UV curing lamp, and the metal plating on the cold foil is transferred to the substrate. After use, the cold foil is wound up by the take-up shaft. However, during operation, because both the substrate and the cold foil are flexible rolls, they are prone to lateral deviation and longitudinal slippage during transport. This leads to misalignment, offset, and misregistration between the hot foil stamping pattern and the preset hot foil stamping area on the substrate, resulting in a large number of scraps. This seriously affects the hot foil stamping quality and product qualification rate, and also wastes cold foil material and increases production costs. Summary of the Invention

[0004] In order to overcome the shortcomings mentioned in the background art, the present invention provides a UV spot cold foil printing device with positioning function.

[0005] The technical solution of the present invention is: a UV partial cold foil stamping printing device with positioning function, comprising a frame, a substrate unwinding shaft rotatably connected to one side of the frame, a traction roller group rotatably connected to the upper part of the frame, the traction roller group being located behind the substrate unwinding shaft along the conveying direction, a substrate take-up shaft rotatably connected to the other side of the frame, a cold foil unwinding shaft and a cold foil take-up shaft rotatably connected to the upper side of the frame, an upper impression roller and a lower impression roller rotatably connected to the middle of the frame, the upper impression roller and the lower impression roller being arranged opposite each other and forming an impression area between them, and a UV curing lamp being fixedly installed on the downstream side of the frame.

[0006] Furthermore, a reference shaft is rotatably connected to the upper side of the frame, and a side positioning retaining ring is slidably connected to one side of the reference shaft. The side positioning retaining ring is slidably engaged with the side edge of the substrate. A guide roller is rotatably connected to the upper side of the frame, and an axially adjustable retaining ring is slidably installed on the outer side of the guide roller. The end face of the axially adjustable retaining ring is in mechanical contact with the edge of the cold foil. The axially adjustable retaining ring is used to constrain the lateral position of the cold foil. The side positioning retaining ring and the axially adjustable retaining ring are fixedly connected by a connecting plate. A guide rod is fixedly installed on the frame, and the connecting plate is slidably connected to the guide rod. A threaded rod is rotatably connected to the frame, and the threaded rod is threadedly connected to the connecting plate.

[0007] Furthermore, eccentric sleeves are rotatably connected to both sides of the frame, and a floating roller is rotatably connected between the two eccentric sleeves. The floating roller is located at the eccentric part of the eccentric sleeve and is located on the upstream side of the printing area. A worm gear is fixedly installed at one end of one of the eccentric sleeves, and a worm is rotatably connected to the frame. The worm meshes with the worm gear.

[0008] Furthermore, a cylinder is fixedly installed on the frame, a positioning plate is fixedly installed on the telescopic end of the cylinder, a detection head is installed on the lower side of the positioning plate through a magnetic sleeve, a probe is slidably connected to the lower part of the detection head, and there are multiple magnetic sleeves and multiple detection heads. A micro switch is fixedly installed inside the detection head.

[0009] Furthermore, the lower side of the positioning plate is provided with evenly distributed threaded holes, and the magnetic sleeve is slidably connected with a slide plate distributed at right angles. The side of the slide plate away from the magnetic sleeve is threadedly connected with a fixing bolt, and the fixing bolt is threadedly engaged with the threaded holes.

[0010] Furthermore, the side positioning retaining ring has a tapered guide structure on the side facing the printing substrate.

[0011] Furthermore, a mechanical tension stabilizing device is provided on the upper side of the frame. The mechanical tension stabilizing device includes a swing arm. One end of the swing arm is hinged to the upper side of the frame, and the other end of the swing arm is rotatably connected to the tension roller. A spring is fixedly installed between the frame and the middle of the swing arm.

[0012] Furthermore, a cooling roller assembly is provided on the downstream side of the frame, and a first cooling roller and a second cooling roller are provided inside the cooling roller assembly. The first cooling roller is located between the imprinting area and the UV curing lamp and is rotatably connected to the frame. The second cooling roller is located on the downstream side of the UV curing lamp and is rotatably connected to the frame. Both the first cooling roller and the second cooling roller are hollow roller bodies, and a circulating cooling medium is circulated inside the first cooling roller and the second cooling roller.

[0013] Furthermore, a UV lamp distance adjustment mechanism is disposed between the UV curing lamp and the frame. A guide rail is disposed inside the UV lamp distance adjustment mechanism. The guide rail is fixedly installed on the upper side of the frame. The UV curing lamp is slidably installed on the guide rail. An electric screw is rotatably connected to the frame. The UV curing lamp is threadedly engaged with the electric screw. Spiral guide channels are disposed inside the first cooling roller and the second cooling roller.

[0014] The beneficial effects are as follows: This invention establishes a lateral mechanical reference for the substrate by slidingly engaging the side positioning retaining ring fixedly installed on the reference shaft with the side edge of the substrate. At the same time, by rotating the threaded rod, the axially adjustable retaining ring is driven to move along the guide rod, so that the end face of the axially adjustable retaining ring mechanically contacts the edge of the cold foil, constraining the lateral position of the cold foil, realizing bidirectional lateral positioning of the substrate and the cold foil, avoiding lateral offset of the hot foil stamping pattern caused by the roll material running off-center, and ensuring the alignment accuracy of the pattern in the width direction of the substrate.

[0015] This invention drives the worm gear to rotate, causing the eccentric sleeve to rotate. This moves the axis of the floating roller in a plane perpendicular to the conveying direction, changing the path length of the cold foil around the floating roller. This achieves fine-tuning of the longitudinal phase of the cold foil relative to the substrate, avoiding longitudinal misalignment of the hot foil pattern caused by tension fluctuations or roll elongation. It ensures the alignment accuracy of the pattern in the conveying direction, and the self-locking characteristic of the worm gear ensures that the adjusted position remains stable, preventing deviation due to vibration during operation.

[0016] This invention uses a cylinder to drive the positioning plate downwards, allowing multiple probes to simultaneously detect the positioning references on the substrate and the cold foil, and triggering a micro switch to send an alignment signal. This enables online automatic registration detection, avoiding subjective errors caused by manual visual judgment and efficiency losses due to downtime detection. At the same time, through the initial positioning of the magnetic sleeve and the final fixing of the fixing bolts and threaded holes, the position of the detection head can be flexibly adjusted according to the different widths and pattern positions of the substrate and the cold foil, adapting to the production needs of various specifications.

[0017] This invention applies constant tension to the cold foil using a tension roller, absorbing tension fluctuations during operation, thereby stabilizing the tension during the cold foil conveying process. This avoids stretching deformation, slippage, or wrinkling of the cold foil caused by sudden changes in tension, ensuring consistent positioning accuracy and hot foil printing quality.

[0018] This invention drives the UV curing lamp to move up and down along the guide rail by rotating the lead screw to change the irradiation distance, thereby actively suppressing the heat of UV curing. This prevents the substrate and cold foil from being overheated and causing thermal deformation, shrinkage or wrinkling, and prevents positioning misalignment and distortion of the hot foil pattern caused by thermal deformation. It is especially suitable for cold foil printing on easily deformable materials such as thin paper and heat-sensitive film. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a right-side sectional view of the three-dimensional structure of the frame of the present invention.

[0021] Figure 3 This is a three-dimensional structural diagram of the eccentric sleeve, floating roller, and worm gear of the present invention.

[0022] Figure 4 This is a three-dimensional structural diagram of the axially adjustable retaining ring, guide rod, and threaded rod of the present invention.

[0023] Figure 5 This is a three-dimensional structural diagram of the cylinder, positioning plate, and probe of the present invention.

[0024] Figure 6 This is a three-dimensional structural diagram of the detection head, probe, and micro switch of the present invention.

[0025] Figure 7 This is a three-dimensional structural diagram of the swing arm, tension roller, and spring of the present invention.

[0026] Reference numerals: 1-Frame, 2-Substrate unwinding shaft, 3-Traction roller group, 4-Substrate rewinding shaft, 5-Cold foil unwinding shaft, 6-Cold foil rewinding shaft, 7-Upper impression roller, 8-Lower impression roller, 9-UV curing lamp, 10-Reference shaft, 11-Side positioning retaining ring, 12-Guide roller, 13-Axially adjustable retaining ring, 14-Guide rod, 15-Threaded rod, 16-Eccentric sleeve, 17-Floating roller, 18-Worm gear, 19-Worm, 20-Cylinder, 21-Positioning plate, 22-Magnetic sleeve, 23-Detection head, 24-Probe, 25-Micro switch, 26-Threaded hole, 27-Slide plate, 28-Fixing bolt, 29-Swing arm, 30-Tension roller, 31-Spring, 32-First cooling roller, 33-Second cooling roller, 34-Guide slide rail, 35-Electric lead screw. Detailed Implementation

[0027] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0028] Example 1: A UV spot cold foil stamping printing device with positioning function, such as Figure 1 and Figure 2As shown, the machine includes a frame 1 that serves as an integral support. A substrate unwinding shaft 2 for unwinding the substrate is rotatably connected to the front side of the frame 1. A traction roller group 3 for pulling the substrate forward is rotatably connected to the middle of the rear side of the frame 1. The traction roller group 3 is located behind the substrate unwinding shaft 2 along the conveying direction. A substrate take-up shaft 4 for rewinding the printed substrate is rotatably connected to the rear side of the frame 1. A cold foil unwinding shaft 5 for unwinding cold foil and a cold foil take-up shaft 6 for rewinding waste cold foil are rotatably connected to the upper part of the frame 1. An upper impression roller 7 and a lower impression roller 8 are rotatably connected to the middle of the frame 1. The upper impression roller 7 and the lower impression roller 8 are arranged opposite each other and form an impression area between them for bonding the cold foil and the substrate. A UV curing lamp 9 for curing UV adhesive is fixedly installed on the downstream side of the frame 1.

[0029] like Figure 2 and Figure 4 As shown, a reference shaft 10 serving as a lateral reference for the substrate is rotatably connected to the upper side of the frame 1. A side positioning retaining ring 11 for guiding the side edge of the substrate is slidably connected to one side of the reference shaft 10. The side positioning retaining ring 11 is slidably engaged with the side edge of the substrate. A guide roller 12 for guiding the cold foil is rotatably connected to the upper side of the frame 1. An axially adjustable retaining ring 13 for constraining the lateral position of the cold foil is slidably installed on the outer side of the guide roller 12. The end face of the axially adjustable retaining ring 13 is mechanically in contact with the edge of the cold foil. The axially adjustable retaining ring 13 is used to constrain the lateral position of the cold foil. The side positioning retaining ring 11 and the axially adjustable retaining ring 13 are fixedly connected by a connecting plate for synchronous adjustment. A guide rod 14 for guiding the sliding of the connecting plate is fixedly installed on the frame 1. The connecting plate is slidably connected to the guide rod 14. A threaded rod 15 for driving the axial movement of the connecting plate is rotatably connected to the frame 1. The threaded rod 15 is threadedly connected to the connecting plate.

[0030] like Figure 2 and Figure 3 As shown, eccentric sleeves 16 for generating eccentric motion are rotatably connected to both sides of the frame 1. A floating roller 17 for changing the path length of the cold foil is rotatably connected between the two eccentric sleeves 16. The floating roller 17 is located at the eccentric part of the eccentric sleeve 16 and is located on the upstream side of the printing area. A worm gear 18 for transmitting power is fixedly installed at one end of one of the eccentric sleeves 16. A manual or automatic worm gear 19 for driving the worm gear is rotatably connected to the frame 1. The worm gear 19 meshes with the worm gear 18.

[0031] like Figure 2 , Figure 5 and Figure 6As shown, a cylinder 20 for driving the lifting and lowering of the detection head is fixedly installed on the frame 1. A positioning plate 21 for supporting the detection head is fixedly installed at the telescopic end of the cylinder 20. A detection head 23 for supporting the probe is installed on the lower side of the positioning plate 21 through a magnetic sleeve 22 for preliminary positioning. A probe 24 for contacting the positioning reference is slidably connected to the lower part of the detection head 23. There are multiple magnetic sleeves 22 and detection heads 23 to accommodate different specifications. A micro switch 25 for sending trigger signals is fixedly installed inside the detection head 23.

[0032] like Figure 2 , Figure 5 and Figure 6 As shown, the lower side of the positioning plate 21 has evenly distributed threaded holes 26 for fixing the position of the detection head. The magnetic sleeve 22 is slidably connected to a slide plate 27 distributed at right angles for adjusting the lateral position. The side of the slide plate 27 away from the magnetic sleeve 22 is threadedly connected to a fixing bolt 28 for locking. The fixing bolt 28 is threadedly engaged with the threaded hole 26. The side positioning retaining ring 11 has a conical guide structure on the side facing the substrate for guiding the substrate to slide in.

[0033] like Figure 7 As shown, a mechanical tension stabilizing device for stabilizing the tension of the cold ironing film is provided on the upper side of the frame 1. The mechanical tension stabilizing device includes a swing arm 29 for absorbing tension fluctuations. One end of the swing arm 29 is hinged to the upper side of the frame 1, and the other end of the swing arm 29 is rotatably connected to a tension roller 30 for tensioning the cold ironing film. A spring 31 for providing constant elastic force is fixedly installed between the frame 1 and the middle of the swing arm 29.

[0034] First, initial settings are made. Based on the actual width of the substrate and the cold foil, as well as the position of the hot foil stamping pattern, the positions of the magnetic sleeve 22 and the detection head 23 are adjusted. The fixing bolt 28 is loosened, and the magnetic sleeve 22 is moved so that the probes 24 on the multiple detection heads 23 are aligned with the preset positioning references (such as color marks, punchings, or printing marks) on the substrate and the cold foil. Then, the fixing bolt 28 is tightened so that it is screwed into the corresponding threaded hole 26, fixing the magnetic sleeve 22 and the detection head 23. At the same time, the side positioning retaining ring 11 and the axially adjustable retaining ring 13 are driven to move along the guide rod 14 by rotating the threaded rod 15, so that the end face of the axially adjustable retaining ring 13 just contacts the edge of the cold foil but does not press it tightly, in order to constrain the lateral deviation of the cold foil. The end face of the side positioning retaining ring 11 just contacts the edge of the substrate but does not press it tightly, in order to constrain the deviation of the substrate. In addition, according to the material characteristics of the cold foil, the preload of the spring 31 is adjusted so that the tension roller 30 provides a suitable constant tension to the cold foil.

[0035] After the device is started, the main drive motor drives the traction roller group 3 and the lower printing roller 8 to rotate synchronously. The substrate unwinding shaft 2 is passively unwound under the action of traction force. The substrate is straightened and conveyed forward by the traction roller group 3. The side edge of the substrate slides into the positioning surface along the conical guide structure of the side positioning retaining ring 11, thereby ensuring that the position of the substrate in the transverse direction is always aligned with the reference axis 10. At the same time, the cold foil unwinding shaft 5 is passively unwound when the cold foil is pulled. The cold foil passes through the guide roller 12, the floating roller 17 and the tension roller 30 in sequence and enters the printing area. During this process, the tension roller 30 absorbs tension fluctuations through the swing arm 29 and the spring 31, so that the cold foil always remains straight and does not stretch.

[0036] When the substrate and the cold foil are running continuously, the cylinder 20 drives the positioning plate 21 to descend according to the set cycle, so that multiple probes 24 approach the surface of the substrate and the cold foil. When the tip of the probe 24 touches the positioning reference on the substrate, the probe 24 is lifted up and triggers the corresponding micro switch 25. Similarly, when another set of probes 24 touches the positioning reference on the cold foil, the corresponding micro switch 25 is triggered. If the positioning reference on the substrate and the cold foil reaches the detection position at the same time, all micro switches 25 are triggered at the same time, indicating that the alignment is accurate. The cylinder 20 then drives the detection head 23 to rise, and the device continues to print normally.

[0037] If only the positioning reference of the substrate is triggered while the positioning reference of the cold foil is not triggered, it indicates that the cold foil is lagging behind the substrate in the longitudinal direction (i.e., the pattern on the cold foil arrives at the printing area later). At this time, the worm gear 19 is rotated, which drives the worm wheel 18 to rotate. The worm wheel 18 drives the eccentric sleeve 16 to rotate in the bearing hole of the frame 1, causing the axis of the floating roller 17 to move in a plane perpendicular to the conveying direction. The path length of the cold foil around the floating roller 17 changes slightly. When the floating roller 17 shifts away from the straight direction of the cold foil, the path length increases, which is equivalent to releasing a small section of cold foil upstream of the printing area, thus delaying the arrival of the pattern on the cold foil at the printing area and compensating for the lag. Conversely, shifting towards the direction reduces the path length, allowing the pattern to arrive earlier. By slightly adjusting the rotation angle of the worm gear 19, precise alignment of the longitudinal phase can be achieved. The self-locking characteristics of the worm wheel 18 and worm gear 19 ensure that the position remains stable after adjustment.

[0038] If the positioning reference of the cold foil is triggered but the positioning reference of the substrate is not triggered, it means that the cold foil is ahead. Then, rotate the worm gear 19 in the opposite direction to make the floating roller 17 move in the opposite direction, shorten the path of the cold foil, and delay the arrival of the cold foil pattern. Repeat the adjustment until both types of micro switches 25 are triggered at the same time.

[0039] After positioning, cylinder 20 drives the detection head 23 to rise, causing probe 24 to detach from the substrate and cold foil to avoid wear. The substrate and cold foil simultaneously enter the printing area between the upper printing roller 7 and the lower printing roller 8 for bonding. Subsequently, the bonded composite passes under the UV curing lamp 9, where the ultraviolet light emitted by the UV lamp rapidly cures the UV adhesive. The metal plating on the cold foil is transferred to the surface of the substrate. The used cold foil waste is wound up by the cold foil take-up shaft 6, and the printed substrate continues to move forward.

[0040] Throughout the process, the tension roller 30 maintains a constant tension in the cold foil through the balancing action of the spring 31, preventing positioning deviation caused by tension fluctuations. When a batch of material is printed, the rolls of material on the substrate unwinding shaft 2 and the cold foil unwinding shaft 5 are exhausted, the device stops, and the process is repeated after replacing the rolls with new ones.

[0041] Example 2: Based on Example 1, such as Figure 2 As shown, a cooling roller assembly for suppressing thermal deformation is provided on the downstream side of the frame 1. The cooling roller assembly contains a first cooling roller 32 located between the imprinting area and the UV curing lamp and a second cooling roller 33 located downstream of the UV curing lamp. The first cooling roller 32 is located between the imprinting area and the UV curing lamp 9 and is rotatably connected to the frame 1. The second cooling roller 33 is located downstream of the UV curing lamp 9 and is rotatably connected to the frame 1. Both the first cooling roller 32 and the second cooling roller 33 are hollow roller bodies for introducing cooling medium. The interiors of the first cooling roller 32 and the second cooling roller 33 are filled with circulating cooling medium for removing heat.

[0042] like Figure 2 As shown, a UV lamp distance adjustment mechanism for adjusting the UV lamp irradiation distance is located between the UV curing lamp 9 and the frame 1. A guide rail 34 for guiding is provided inside the UV lamp distance adjustment mechanism. The guide rail 34 is fixedly installed on the upper side of the frame 1. The UV curing lamp 9 is slidably installed on the guide rail 34. An electric screw 35 for driving the UV curing lamp to rise and fall is rotatably connected to the frame 1. The UV curing lamp 9 and the electric screw 35 are threadedly engaged to change the irradiation distance. The first cooling roller 32 and the second cooling roller 33 are provided with spiral guide channels (not shown in the figure) to enhance heat exchange efficiency.

[0043] To suppress heat deformation of the substrate caused by the heat generated by the UV curing lamp 9, a heat deformation suppression system works in tandem: between the printing zone and the UV curing lamp 9, the first cooling roller 32 contacts the non-printing surface of the substrate, and its internal circulating cooling medium carries away heat through a spiral guide channel, reducing the temperature of the substrate to near room temperature before it enters the curing zone. Downstream of the UV curing lamp 9, the second cooling roller 33 performs secondary cooling on the hot-stamped substrate to ensure that the temperature is below 40°C. At the same time, depending on the heat sensitivity of the substrate material, the operator can rotate the electric screw 35 to drive the UV curing lamp 9 to move up and down along the guide rail 34, increasing or decreasing the distance between the UV lamp and the substrate to avoid heat deformation.

[0044] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A UV spot cold foil stamping printing device with positioning function, characterized in that: The machine includes a frame (1), one side of which is rotatably connected to a substrate unwinding shaft (2), the upper part of which is rotatably connected to a traction roller group (3), the traction roller group (3) being located behind the substrate unwinding shaft (2) along the conveying direction, the other side of which is rotatably connected to a substrate rewinding shaft (4), the upper side of which is rotatably connected to a cold foil unwinding shaft (5) and a cold foil rewinding shaft (6), the middle part of which is rotatably connected to an upper impression roller (7) and a lower impression roller (8), the upper impression roller (7) and the lower impression roller (8) being arranged opposite each other and forming an impression zone between them, and a UV curing lamp (9) being fixedly installed on the downstream side of the frame (1).

2. The UV spot cold foil stamping device with positioning function as described in claim 1, characterized in that: A reference shaft (10) is rotatably connected to the upper side of the frame (1). A side positioning retaining ring (11) is slidably connected to one side of the reference shaft (10). The side positioning retaining ring (11) is slidably engaged with the side edge of the substrate. A guide roller (12) is rotatably connected to the upper side of the frame (1). An axially adjustable retaining ring (13) is slidably installed on the outer side of the guide roller (12). The end face of the axially adjustable retaining ring (13) is mechanically in contact with the edge of the cold stamping film. The axially adjustable retaining ring (13) is used to constrain the lateral position of the cold stamping film. The side positioning retaining ring (11) and the axially adjustable retaining ring (13) are fixedly connected by a connecting plate. A guide rod (14) is fixedly installed on the frame (1). The connecting plate is slidably connected to the guide rod (14). A threaded rod (15) is rotatably connected to the frame (1). The threaded rod (15) is threadedly connected to the connecting plate.

3. The UV spot cold foil stamping device with positioning function as described in claim 2, characterized in that: Both sides of the frame (1) are rotatably connected to eccentric sleeves (16), and a floating roller (17) is rotatably connected between the two eccentric sleeves (16). The floating roller (17) is located at the eccentric part of the eccentric sleeve (16) and is located on the upstream side of the printing area. One end of one of the eccentric sleeves (16) is fixedly installed with a worm gear (18). A worm (19) is rotatably connected to the frame (1) and the worm gear (19) meshes with the worm gear (18).

4. The UV spot cold foil stamping printing device with positioning function as described in claim 3, characterized in that: A cylinder (20) is fixedly installed on the frame (1). A positioning plate (21) is fixedly installed on the telescopic end of the cylinder (20). A detection head (23) is installed on the lower side of the positioning plate (21) through a magnetic sleeve (22). A probe (24) is slidably connected to the lower part of the detection head (23). There are multiple magnetic sleeves (22) and multiple detection heads (23). A micro switch (25) is fixedly installed inside the detection head (23).

5. A UV spot cold foil stamping printing device with positioning function as described in claim 4, characterized in that: The lower side of the positioning plate (21) is provided with evenly distributed threaded holes (26), and the magnetic sleeve (22) is slidably connected with a slide plate (27) distributed at right angles. The side of the slide plate (27) away from the magnetic sleeve (22) is threadedly connected with a fixing bolt (28), and the fixing bolt (28) is threadedly engaged with the threaded hole (26).

6. A UV spot cold foil stamping printing device with positioning function as described in claim 5, characterized in that: The side positioning retaining ring (11) has a conical guide structure on the side facing the substrate.

7. A UV spot cold foil stamping printing device with positioning function as described in claim 6, characterized in that: A mechanical tension stabilizing device is provided on the upper side of the frame (1). The mechanical tension stabilizing device includes a swing arm (29). One end of the swing arm (29) is hinged to the upper side of the frame (1), and the other end of the swing arm (29) is rotatably connected to the tension roller (30). A spring (31) is fixedly installed between the frame (1) and the middle part of the swing arm (29).

8. A UV spot cold foil stamping printing device with positioning function as described in claim 7, characterized in that: A cooling roller assembly is provided on the downstream side of the frame (1). The cooling roller assembly contains a first cooling roller (32) and a second cooling roller (33). The first cooling roller (32) is located between the imprinting area and the UV curing lamp (9) and is rotatably connected to the frame (1). The second cooling roller (33) is located on the downstream side of the UV curing lamp (9) and is rotatably connected to the frame (1). Both the first cooling roller (32) and the second cooling roller (33) are hollow rollers. The interiors of the first cooling roller (32) and the second cooling roller (33) are circulated with a cooling medium.

9. A UV spot cold foil stamping printing device with positioning function as described in claim 8, characterized in that: The UV lamp distance adjustment mechanism is located between the UV curing lamp (9) and the frame (1). A guide rail (34) is provided inside the UV lamp distance adjustment mechanism. The guide rail (34) is fixedly installed on the upper side of the frame (1). The UV curing lamp (9) is slidably installed on the guide rail (34). An electric screw (35) is rotatably connected to the frame (1). The UV curing lamp (9) and the electric screw (35) are threaded together. The first cooling roller (32) and the second cooling roller (33) are provided with spiral guide channels inside.

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