A hot head mechanism for a gilding machine and a gilding machine

Abstract

The utility model relates to printing equipment technical field especially relates to a kind of head mechanism for gilding press and a kind of gilding press.The head mechanism includes head pedestal, gilding wheel, head base and upper fixed support, gilding wheel rotation is arranged at the left side of head pedestal, upper fixed support is fixedly connected to the right end of head pedestal, upper fixed support is located above head base, and is connected with head base by four connecting rods of rectangular distribution, the end of connecting rod and upper fixed support between, the end of connecting rod and head base between are respectively connected by hinged pivot, the middle part of connecting rod is connected with the cylinder fixing seat on head base by constant pressure cylinder, both ends of constant pressure cylinder are connected with corresponding connecting piece using hinged mechanism, constant pressure cylinder is equipped with constant pressure valve, and constant pressure cylinder can be driven to automatically extend and retract when connecting rod swings left and right.The utility model can facilitate to realize workpiece and gilding wheel to gilding foil exert constant pressure.

Description

Technical Field

[0001] This utility model relates to the field of printing equipment technology, and in particular to a hot stamping head mechanism for a hot stamping machine and a hot stamping machine. Background Technology

[0002] Hot stamping refers to the process of transferring electroplated aluminum foil onto the surface of a substrate under specific temperature and pressure. A hot stamping machine is the equipment used to perform this process. It primarily utilizes the principle of heat transfer, bringing the electroplated aluminum foil into contact with the stamping plate and substrate under pressure. The heating plate generates heat, which in turn heats the aluminum foil, causing the thermoplastic resin layer and adhesive to melt. The resin layer's adhesion decreases, while the adhesive's viscosity increases after melting. Simultaneously, the aluminum layer peels off from the aluminum foil base and is transferred to the substrate. As the pressure is released, the adhesive rapidly cools and solidifies, leaving the aluminum layer firmly attached to the substrate, completing the hot stamping process.

[0003] Conventional hot stamping machines such as Figure 1 As shown, the device includes a frame and a controller. The frame is equipped with a foil feeding mechanism, a hot stamping head mechanism, a foil collecting mechanism, and a workpiece moving mechanism. The workpiece moving mechanism includes a workpiece fixing base and a workpiece rotating base. The workpiece rotating base is rotatably mounted on the workpiece fixing base and is equipped with a first drive mechanism to drive its rotation. The workpiece rotating base is used to fix the workpiece. The hot stamping head mechanism includes a hot stamping head base and a hot stamping wheel. The hot stamping wheel is rotatably mounted on the hot stamping head base and is equipped with a second drive mechanism to drive its rotation. The hot stamping foil drawn from the foil feeding mechanism passes sequentially through the pre-hot stamping pressing wheel, the mating area between the workpiece and the hot stamping wheel, and the guide of the post-hot stamping pressing wheel before being collected by the foil collecting mechanism. The hot stamping head base is equipped with a cylinder to drive the hot stamping wheel downwards, thereby pressing the hot stamping foil onto the surface of the workpiece. Under the drag of the first drive mechanism, the hot stamping foil is pulled out by the friction between the hot stamping wheel and the workpiece. Under the high temperature of the hot stamping wheel, the pattern and texture of the hot stamping foil are transferred onto the workpiece. This hot stamping machine has a relatively simple structure and is suitable for hot stamping on regular cylindrical surfaces.

[0004] To accommodate non-circular workpieces, a moving mechanism is typically added to the workpiece base or the hot stamping head base to drive the workpiece or hot stamping wheel to achieve adaptive adjustment. For example, Chinese patent document CN221187819U discloses a hot stamping device, which includes a worktable; gold strip for hot stamping workpieces; an unwinding roller disposed on one side of the worktable for unwinding the gold strip; and a take-up roller disposed on the other side of the worktable for taking up the gold strip. The take-up roller and the unwinding roller are arranged opposite to each other. A sliding groove is provided on the upper end face of the worktable, extending along the length of the worktable. A sliding seat is provided at the sliding groove of the worktable, and the sliding seat is slidably connected to the upper end face of the worktable. A telescopic cylinder is provided inside the worktable, and the piston rod of the telescopic cylinder is fixedly connected to the sliding seat. The sliding seat is slidably connected to the sliding groove of the worktable. A rotary motor is provided inside the sliding seat, and the output shaft of the rotary motor passes through the sliding seat and is coaxially fixedly connected to a workpiece mold. A misshapen workpiece adapted to the workpiece mold is connected to the upper end face of the workpiece mold. When using the above technical solution to hot stamping irregularly shaped workpieces, the operator first tensions the gold strip using take-up and unwind rollers. Then, a rotary motor and a telescopic cylinder are activated. The rotary motor rotates to change the hot stamping surface of the workpiece, and the telescopic cylinder repeatedly extends and retracts to ensure that each hot stamping surface of the workpiece is in contact with the gold strip, thus ensuring complete hot stamping during continuous rotation processing. However, the telescopic cylinder in the above solution only ensures that each hot stamping surface of the workpiece is in contact with the gold strip (i.e., hot stamping foil), without considering pressure control. During the movement and adjustment process, the pressure applied by the workpiece and the hot stamping wheel to the gold strip fluctuates, which is detrimental to ensuring the quality of hot stamping. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides a hot stamping head mechanism for a hot stamping machine, which can facilitate the application of constant pressure between the workpiece and the hot stamping wheel on the hot stamping foil.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a hot stamping head mechanism for a hot stamping machine, including a hot stamping head base, a hot stamping wheel, a hot stamping head base, and an upper fixed bracket. The hot stamping wheel is rotatably located on the left side of the hot stamping head base, and the hot stamping wheel is equipped with a hot stamping wheel self-rotation drive mechanism to drive its rotation. The upper fixed bracket is fixedly connected to the right end of the hot stamping head base and is located above the hot stamping head base. It is connected to the hot stamping head base by four connecting rods arranged in a rectangular pattern. The ends of the connecting rods are connected to the upper fixed bracket and the ends of the connecting rods are connected to the hot stamping head base by hinged pivots. The axis of the hinged pivots is arranged horizontally in the front-back direction. The middle part of the connecting rod is connected to the cylinder fixed seat on the hot stamping head base by a constant pressure cylinder. Both ends of the constant pressure cylinder are connected to the corresponding connecting parts by hinged mechanisms. A constant pressure valve is installed at the air inlet of the constant pressure cylinder. When the connecting rod swings left and right, it can drive the constant pressure cylinder to automatically extend and retract.

[0007] In practical implementation, it can be used in conjunction with a conventional workpiece moving mechanism. The workpiece moving mechanism includes a workpiece fixed base and a workpiece rotating base. The workpiece rotating base is rotatably mounted on the workpiece fixed base and is equipped with a first drive mechanism to drive its rotation. The workpiece rotating base is used to fix the workpiece. The workpiece fixed base is fixed relative to the frame. The hot stamping head base can be close to the workpiece fixed base (i.e., the hot stamping wheel is close to the workpiece) so that the hot stamping foil led out from the foil feeding mechanism can pass through the mating area between the workpiece and the hot stamping wheel and complete the hot stamping process. With the above scheme, the upper fixed bracket is connected to the hot stamping head base through four rectangularly distributed connecting rods, forming a parallelogram-shaped double rocker mechanism. Its working characteristic is that the connecting rods swing, causing the upper fixed bracket to swing left and right. The hot stamping wheel is connected to the upper fixed bracket through the hot stamping head base. The hot stamping wheel contacts the workpiece through the hot stamping foil. The movement of the workpiece's trajectory drives the hot stamping wheel to swing back and forth with the upper fixed bracket. The reciprocating motion of the hot stamping wheel drives the connecting rods of the double rocker mechanism to swing left and right. The left and right swing of the connecting rods drives the piston rod of the constant pressure cylinder to reciprocate. The function of the constant pressure valve is to exhaust air when the constant pressure cylinder is compressed, and to close the valve when the piston rod of the constant pressure cylinder extends, thus maintaining a constant internal pressure in the constant pressure cylinder, thereby ensuring consistent contact pressure between the hot stamping wheel and the workpiece, and ensuring the quality of the hot stamping.

[0008] To ensure that the constant pressure amplitude of the constant pressure cylinder is within a certain range, this invention preferably controls the piston rod's travel stroke to a small value (generally not exceeding 50mm). To better adapt to irregular workpieces (where the radial dimension of their running trajectory differs significantly from the radial dimension of their rotation center), a further preferred embodiment of this invention includes a controller. A connecting rod limit switch for controlling the left and right swing stroke of the connecting rod is installed on the upper surface of the heating head base. The heating head base is mounted on the heating head base mounting base via a heating head screw nut moving pair, allowing the heating head base to move horizontally in the left and right directions relative to the heating head base mounting base. The heating head screw nut moving pair is equipped with a heating head screw drive motor. The connecting rod limit switch, the constant pressure cylinder, and the heating head screw drive motor are all electrically connected to the controller. When the linkage limit switch is triggered, the controller confirms that the constant pressure cylinder is fully compressed or fully extended. The controller outputs a command to drive the heating head screw drive motor to rotate forward or reverse, causing the heating head base to move a set distance (e.g., 30mm) in the left and right directions. During the entire hot stamping process, the pressure inside the constant pressure cylinder is autonomously adjusted by the constant pressure valve.

[0009] To make the structure simple and reliable, a further preferred solution is that the two connecting rods on the left side are fixedly connected in the middle position by a longitudinal beam, one end of the constant pressure cylinder is connected to the middle of the longitudinal beam, and the other end is connected to the cylinder mounting base.

[0010] To ensure a simple and reliable structure, a further preferred embodiment is that the hot stamping wheel rotation drive mechanism includes a hot stamping wheel rotation motor and a hot stamping wheel transmission belt, with the output shaft of the hot stamping wheel rotation motor being connected to the input shaft of the hot stamping wheel via the hot stamping wheel transmission belt.

[0011] Based on the aforementioned hot stamping head mechanism for a hot stamping machine, this utility model also provides a hot stamping machine. The main structure of the hot stamping machine can be implemented with reference to the prior art, including a frame and a controller. The frame is equipped with a foil feeding mechanism, a hot stamping head mechanism, a foil receiving mechanism, and a workpiece moving mechanism. The workpiece moving mechanism is located in the left area of ​​the hot stamping head mechanism. The workpiece moving mechanism includes a workpiece fixing base and a workpiece rotating base. The workpiece rotating base is rotatably mounted on the workpiece fixing base, and the workpiece rotating base is equipped with a first driving mechanism to drive its rotation. The workpiece rotating base is used to fix the workpiece. The workpiece fixing base and the hot stamping head base can approach each other so that the hot stamping foil led out from the foil feeding mechanism can pass through the mating area between the workpiece and the hot stamping wheel and complete the hot stamping process. The key point of this utility model is that the workpiece fixing base is fixed relative to the frame, and the hot stamping head mechanism can be the hot stamping head mechanism for hot stamping machine described above. The hot stamping head base is installed on the frame to ensure that the hot stamping head base can be close to the workpiece fixing base (i.e., the hot stamping wheel is close to the workpiece), so that the hot stamping foil led out from the foil feeding mechanism can pass through the mating area between the workpiece and the hot stamping wheel and complete the hot stamping process.

[0012] In the preferred hot stamping machine design, a linkage limit switch is installed on the upper surface of the hot stamping head base to control the left and right swing stroke of the linkage; the hot stamping head base is mounted on the hot stamping head base mounting base of the machine frame via a hot stamping head screw nut moving pair, so that the hot stamping head base can move horizontally in the left and right direction relative to the machine frame; the hot stamping head screw nut moving pair is equipped with a hot stamping head screw drive motor, and the linkage limit switch, constant pressure cylinder and hot stamping head screw drive motor are all electrically connected to the controller.

[0013] In some other preferred hot stamping machine designs, a foil powder adsorption device is installed on the left side of the workpiece movement mechanism of the machine frame. This device includes a negative pressure suction hood that covers the workpiece rotating seat. This design effectively removes dust from the workpiece movement area, further ensuring the quality of the hot stamping.

[0014] In some other preferred hot stamping machine designs, the output end of the foil feeding mechanism is equipped with a foil buffer constant tension mechanism. This mechanism includes a foil buffer base plate, which is vertically fixed to the frame. A load cell holder and a linear guide rail are fixedly mounted on the front of the base plate. A load cell is fixed to the upper end of the load cell holder. The linear guide rail extends vertically and is equipped with a fixed foil tensioning wheel holder and a floating foil tensioning wheel holder that move vertically. The fixed foil tensioning wheel holder is located above the load cell holder, with its bottom end pressing against the load cell probe. Multiple upper fixed foil tensioning wheels are arranged at left-right intervals on the front of the fixed foil tensioning wheel holder. The floating foil tensioning wheel holder is located below the load cell holder, with multiple floating foil tensioning wheels arranged at left-right intervals on its front. The foil feeding mechanism is located to the left of the foil buffer base plate, and a tension motor and a wire drum support are fixed to the left side of the foil buffer base plate below the feeding mechanism. A wire drum is mounted on a support seat, with one end connected to the output shaft of a tension motor via a torque transmission mechanism. This mechanism includes a magnetic powder clutch; its input end is connected to the output shaft of the tension motor, and its output end is connected to the wire drum. The load cell, magnetic powder clutch, and tension motor are all electrically connected to the controller. A wire rope fixing seat is fixed to the left end of the floating foil wheel seat, and a wire rope is wound around the outer circumference of the wire drum. One end of the wire rope is fixedly connected to the wire rope, and the other end is fixedly connected to the wire drum support after passing over one or more wire guide wheels. The floating foil wheel seat is equipped with a vertical stroke control mechanism. When the foil from the foil feeding mechanism alternately passes over the upper fixed foil wheel and the floating foil wheel from left to right and is in a preset tension state, the foil feeding mechanism stops releasing the foil. The length of foil released by the floating foil wheel seat from the lower end of its stroke to the upper end of its stroke is greater than the length of foil required for the foil processing of one workpiece.

[0015] The foil feeding and foil taking-up mechanisms are conventional technologies. The foil feeding mechanism generally includes at least a foil feeding motor, which has a built-in brake (i.e., a brake); the foil taking-up mechanism generally includes at least a foil taking-up motor. The working principle of this utility model is as follows: 1. For the first loading of hot foil, the hot foil is clamped on the foil feeding mechanism, the free end of the hot foil is pulled out, and it is wound according to the design path (including at least multiple upper fixed foil feeding wheels and multiple floating foil feeding wheels designed in this utility model). Finally, the free end is fixed on the foil taking-up mechanism of the hot foil machine. At this time, the foil feeding motor corresponding to the foil feeding mechanism is not powered on, and its output shaft is in a braking state, so foil feeding cannot be performed at this time.

[0016] 2. Tension Formation: When the tension motor is energized, its output shaft rotates, driving the input shaft of the magnetic powder clutch to rotate. A controllable excitation current is supplied to the control coil of the magnetic powder clutch, generating a certain torque on its output shaft. The wire drum rotates, winding the wire rope onto it. The tension in the wire rope pulls the floating foil tensioning wheel seat downwards, pulling the hot stamping foil. Since the bottom end of the fixed foil tensioning wheel seat presses against the probe of the load cell, the fixed foil tensioning wheel is essentially in a fixed state. Under the downward tension of the wire rope, the floating foil tensioning wheel keeps the hot stamping foil taut. The load cell calculates the tension within the hot stamping foil based on the pressure pressed against its detection head and transmits this information to the controller. The user adjusts the given parameters according to the controller's display results until the load cell's display results meet the requirements, thus achieving constant tension.

[0017] 3. Automatic Operation: The foil feeding motor is in a power-off braking state, while the tension motor is energized. A stable torque is generated through the magnetic powder clutch, creating constant tension on the hot stamping foil. During hot stamping, the workpiece and the hot stamping wheel press the foil between them. The foil maintains a certain tension, ensuring it evenly covers the workpiece surface. The rotational torque of the workpiece overcomes the foil tension, pulling the foil out. Since the foil feeding motor is power-off, the foil feeding function stops. Under the pull of the workpiece's rotational torque, the floating foil wheel moves upwards until the hot stamping is complete. Throughout the entire hot stamping process, the foil feeding motor does not perform its feeding action. The tension within the foil remains constant without disturbance from the foil feeding, ensuring the foil covers the workpiece surface evenly and without wrinkles.

[0018] 4. Automatic foil feeding: When a hot stamping cycle ends and workpieces are being picked up or placed, the foil feeding motor starts working, releasing the hot stamping foil into the foil buffer constant tension mechanism. Driven by the tension motor, the floating foil feeding wheel moves downwards until the floating foil feeding wheel seat reaches the lower end of its stroke, at which point the foil feeding ends. The tension motor continues to run to ensure that the tension within the hot stamping foil matches the given tension.

[0019] This invention features a foil buffer constant tension mechanism. The hot stamping foil alternately wraps around the upper fixed foil wheel and the floating foil wheel from left to right (forming multiple S-shaped wraps), buffering between them. The length of the buffered foil is greater than the length of foil required for stamping one workpiece (the length of foil released when the floating foil wheel moves from its lower end to its upper end of its stroke is greater than the length of foil required for stamping one workpiece). The output of the tension motor and the magnetic powder clutch pulls the floating foil wheel via a steel wire rope, maintaining a constant tension on the foil buffered between the upper fixed and floating foil wheels. The speed at which the foil is pulled out has no effect on the foil tension. This ensures that irregularly shaped workpieces are not affected by changes in their radius during rotation, guaranteeing the constant tension required for hot stamping. Traditional hot stamping machines perform foil take-up and release simultaneously. Releasing the foil causes some disturbance to the foil tension during operation, making it difficult to meet the stringent tension requirements of irregularly shaped workpieces and rendering the machine unusable. This invention utilizes a sufficient buffer of hot stamping foil, eliminating the need for a foil-feeding mechanism during the hot stamping process (zero disturbance). The friction between the workpiece and the hot stamping wheel pulls the foil. At the end of one hot stamping cycle, during the operator's workpiece handling, the foil-feeding mechanism feeds foil to the constant tension foil buffer, ensuring that foil feeding and hot stamping are always time-separated, thus guaranteeing constant foil tension. This solution is particularly suitable for workpieces with raised surfaces or irregular shapes requiring hot stamping.

[0020] In some other preferred hot stamping machine designs, a vertically extending rack is fixedly mounted on the front of the foil buffer base plate. A floating foil wheel holder anti-drop cylinder with its axis oriented in the front-rear direction is installed on the floating foil wheel holder. A rack engaging plate is fixedly mounted at the piston rod end of the floating foil wheel holder anti-drop cylinder. The rack engaging plate has a first state of engaging and fixing with the rack and a second state of being separated from the rack. When a roll of hot stamping foil is used up and needs to be refilled, the floating foil wheel holder anti-drop cylinder is vented, and the rack engaging plate extends and engages with the rack. At this time, the floating foil wheel holder is fixed relative to the foil buffer base plate. When the replacement hot stamping foil is installed, the air intake of the foil wheel holder anti-drop cylinder is closed, and the device returns to its original state. At this time, the rack engaging plate is in the second state of being separated from the rack, which does not affect the up-and-down movement of the floating foil wheel holder. During the replacement of hot stamping foil, the floating foil tensioning wheel seat anti-fall cylinder can effectively prevent the floating foil tensioning wheel seat from falling under the action of gravity, so as to facilitate the replacement of hot stamping foil.

[0021] In some other preferred hot stamping machine designs, a wire drum support is fitted with a wire brake cylinder on one side of the wire drum. The axial direction of the wire brake cylinder is along the radial direction of the wire drum. A wire locking block is fixedly installed at the end of the piston rod of the wire brake cylinder. The wire locking block has a first state of pressing and fixing the wire rope onto the wire drum and a second state of separating from the wire rope. When the machine is stopped and the power is off, the tension within the hot stamping foil will drag the floating foil wheel seat upward due to the de-energization of the magnetic powder clutch. At this time, the wire brake cylinder, which has been pre-operated to lock the wire rope onto the wire drum, can effectively prevent instantaneous impact.

[0022] In some other preferred hot stamping machine designs, the vertical stroke control mechanism of the floating foil wheel seat includes an upper limit switch and a lower limit switch mounted on the foil buffer base plate. Both the upper and lower limit switches are electrically connected to the controller. This implementation is simple and reliable, and can easily achieve automatic control of the vertical stroke of the floating foil wheel seat.

[0023] In some other preferred hot stamping machine designs, the input end of the magnetic powder clutch is connected to the output shaft of the tension motor via a synchronous belt drive mechanism, and the output end of the magnetic powder clutch is connected to the wire drum via a magnetic powder clutch torque output shaft. The magnetic powder clutch torque output shaft, the synchronous belt drive mechanism, and the magnetic powder clutch are all equipped with protective covers. This implementation scheme is simple and reliable, and the protective covers effectively protect the transmission structure.

[0024] In some other preferred hot stamping machine designs, the foil feeding mechanism includes a foil feeding motor, a foil feeding mechanism mounting base, a foil loading rod, and a foil clamping component. The foil feeding motor is fixedly connected to the foil buffer base plate via the foil feeding mechanism mounting base. The foil loading rod is driven by the output end of the foil feeding motor, and the foil clamping component is mounted on the foil loading rod. A foil guide wheel is provided on the left side of the front of the foil buffer base plate. The hot stamping foil led out from the foil clamping component first passes around the foil guide wheel, and then alternately passes around the upper fixed foil wheel and the floating foil wheel from left to right. The foil guide wheel allows for better control of the direction and angle of the hot stamping foil, further facilitating the control of its tension.

[0025] In some other preferred hot stamping machine designs, a front hot stamping foil roller and a rear hot stamping foil roller are mounted on the frame. This allows the hot stamping foil, drawn from the foil feeding mechanism, to sequentially pass through a foil buffer constant tension mechanism, the front hot stamping foil roller, the mating area between the workpiece and the hot stamping roller, and the guide of the rear hot stamping foil roller before being collected by a foil receiving mechanism. The front hot stamping foil roller comprises two foil rollers arranged opposite each other, allowing the hot stamping foil to pass between the corresponding two foil rollers. The front hot stamping foil roller is mounted on the frame via a foil moving mechanism, which includes a horizontal base plate fixed relative to the frame. The horizontal base plate is mounted via an X-axis lead screw and nut moving pair. The device includes an X-axis pressing seat capable of moving left and right, and a Z-axis pressing seat capable of moving up and down, mounted on the X-axis pressing seat via a Z-axis lead screw and nut sliding joint. A foil-pressing wheel is mounted on the Z-axis pressing seat via a foil-pressing rod. Both the X-axis and Z-axis lead screw and nut sliding joints are equipped with X-axis and Z-axis lead screw and nut sliding joints, respectively. Both motors are electrically connected to a controller with a preset control program. This controller automatically adjusts the position of the foil-pressing wheel based on the workpiece's movement trajectory using the X-axis and Z-axis lead screw and nut motors. By automatically adjusting the position of the foil-pressing wheel, the device ensures that the foil always contacts the workpiece at a suitable angle, thus ensuring that the foil always covers all sections of the workpiece surface and effectively guaranteeing the quality of the foil stamping. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a traditional hot stamping machine; Figure 2 This is a schematic diagram of the workpiece structure involved in this utility model; Figure 3 This is a schematic diagram of the overall structure of the hot stamping machine provided by this utility model; Figure 4 yes Figure 3 A schematic diagram of the foil buffer constant tension mechanism involved in the illustrated embodiment (without protective cover installed); Figure 5 yes Figure 4 The illustrated embodiment is shown as a structural diagram from another angle; Figure 6 yes Figure 3 A three-dimensional structural diagram of the hair-curling mechanism involved in the illustrated embodiment; Figure 7 yes Figure 6 A front view of the embodiment shown; Figure 8 yes Figure 3 The schematic diagram of the foil pressing wheel and foil pressing moving mechanism involved in the embodiment shown is shown.

[0027] The components in the diagram are labeled as follows: Frame 1, Foil powder adsorption device 10, Hot stamping front foil pressing wheel 11, Hot stamping rear foil pressing wheel 12, Foil feeding mechanism 2, Foil feeding motor 21, Foil feeding mechanism fixing seat 22, Foil loading rod 23, Foil clamping component 24, Hot stamping head mechanism 3, Hot stamping wheel 31, Hot stamping head base 32, Hot stamping head base 33, Upper fixing bracket 34, Connecting rod 35, Constant pressure cylinder 36, Cylinder fixing seat 37, Connecting rod limit switch 38, Hot stamping head lead screw drive motor 39, Constant pressure valve 310. Hot stamping wheel self-rotating motor 311, hot stamping wheel drive belt 312, hot stamping head base bottom slider 313, hot stamping head base mounting base 314, foil take-up mechanism 4, workpiece moving mechanism 5, hot stamping foil 6, workpiece 7, hot stamping inclined surface 71, hot stamping straight surface 72, hot stamping connecting angle 73, foil buffer constant tension mechanism 8, foil buffer base plate 81, upper fixed foil wheel 82, fixed foil wheel seat 83, weighing sensor 84, weighing sensor fixing seat 85, rack and pinion 86, floating foil Upper limit switch for the foil wheel seat 87, lower limit switch for the floating foil wheel seat 88, linear guide rail 89, foil guide wheel 810, tension motor 811, tension motor pulley 812, synchronous belt 813, magnetic powder clutch 814, magnetic powder clutch input synchronous pulley 815, magnetic powder clutch torque output shaft 816, wire drum 817, wire brake cylinder 818, wire drum support seat 819, wire guide wheel 820, wire rope 821, wire rope fixing seat 8 22, Floating foil tensioning wheel seat 823, Floating foil tensioning wheel seat anti-fall cylinder 824, Floating foil tensioning wheel 825, Protective cover 826, Linear slider 827, Steel wire locking block 828, Horizontal base plate 91, Foil pressing X-axis moving seat 92, Foil pressing Z-axis moving seat 93, Foil pressing rod 94, X-axis lead screw drive motor 95, Z-axis lead screw drive motor 96, X-axis guide rail 97, X-axis lead screw 98, Z-axis limit switch 99, Z-axis guide rail 910, Z-axis slider 911. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] like Figures 3 to 8As shown, the hot stamping machine of this utility model includes a frame 1 and a controller. The frame 1 is equipped with a foil feeding mechanism 2, a hot stamping head mechanism 3, a foil receiving mechanism 4, and a workpiece moving mechanism 5. The workpiece moving mechanism 5 includes a workpiece fixing base and a workpiece rotating base. The workpiece rotating base is rotatably mounted on the workpiece fixing base and is equipped with a first driving mechanism to drive its rotation. The workpiece rotating base is used to fix the workpiece 7. The hot stamping head mechanism 3 includes a hot stamping head base 32 and a hot stamping wheel 31. The hot stamping wheel 31 is rotatably mounted on the hot stamping head base 32 and is equipped with a hot stamping wheel self-rotation driving mechanism to drive its rotation. The workpiece fixing base and the hot stamping head base 32 can approach each other so that the hot stamping foil 6 led out from the foil feeding mechanism 2 can pass through the mating area between the workpiece 7 and the hot stamping wheel 31 and complete the hot stamping process. The main structures of the foil feeding mechanism 2, the hot stamping head mechanism 3, the foil taking-up mechanism 4, and the workpiece moving mechanism 5 can all be implemented with reference to existing technologies. For example, the foil feeding mechanism 2 generally includes at least a foil feeding motor 21 and a foil feeding rod 23, and the foil feeding motor 21 has a built-in brake (i.e., a brake); the foil taking-up mechanism 4 generally includes at least a foil taking-up motor and a foil taking-up rod; the hot stamping wheel rotation drive mechanism generally includes a hot stamping wheel rotation motor 311 and a hot stamping wheel transmission belt 312, and the output shaft of the hot stamping wheel rotation motor 311 is connected to the input shaft of the hot stamping wheel 31 through the hot stamping wheel transmission belt 312, which is equivalent to the output shaft of the hot stamping wheel rotation motor 311 driving the hot stamping wheel 31 to rotate around its own axis through the belt transmission structure; the first drive mechanism can generally adopt the form of servo motor drive, and the workpiece rotating seat is equipped with a fixed mounting structure for fixing the workpiece 7. According to the different external structures of the workpiece 7, a conventional fixed mounting structure can be designed accordingly. Regarding the electrical connection structure that is not explicitly defined in this utility model, the electrical components and power sources involved in the foil feeding mechanism 2, the ironing head mechanism 3, the foil collecting mechanism 4, and the workpiece moving mechanism 5 can all be electrically connected according to conventional technology and controllers.

[0030] This invention first improves the ironing mechanism 3. The ironing mechanism 3 further includes an ironing base 33 and an upper fixing bracket 34. The hot stamping wheel 31 is rotatably mounted on the left side of the ironing base 32. The upper fixing bracket 34 is fixedly connected to the right end of the ironing base 32 and is positioned above the ironing base 33. It is connected to the ironing base 33 via four rectangularly distributed connecting rods 35. The ends of the connecting rods 35 are separated from the upper fixing bracket 34, and the ends of the connecting rods 35 are separated from the ironing base 33. The components are connected by a hinged pivot, with the axis of the hinged pivot arranged horizontally in the front-to-back direction. The middle part of the connecting rod 35 is connected to the cylinder fixing seat 37 on the heating head base 33 through the constant pressure cylinder 36. Both ends of the constant pressure cylinder 36 are connected to the corresponding connecting parts by a hinge mechanism (the corresponding connecting part at one end is the cylinder fixing seat 37, and the corresponding connecting part at the other end is the connecting rod 35 or a longitudinal beam set on the connecting rod 35). The constant pressure cylinder 36 is equipped with a constant pressure valve 310 at the air inlet. When the connecting rod 35 swings left and right, it can drive the constant pressure cylinder 36 to automatically extend and retract.

[0031] In operation, the hot stamping wheel 31 contacts the workpiece 7 via the hot stamping foil 6. The movement of the workpiece 7 causes the hot stamping wheel 31 to oscillate back and forth with the upper fixed bracket 34, which in turn drives the connecting rod 35 to oscillate left and right. The left and right oscillation of the connecting rod 35 drives the piston rod of the constant pressure cylinder 36 to reciprocate. The function of the constant pressure valve 310 is to release air when the constant pressure cylinder 36 is compressed, and to close the air release valve 310 when the piston rod of the constant pressure cylinder 36 extends, thus maintaining a constant internal pressure in the constant pressure cylinder 36. This ensures that the contact pressure between the hot stamping wheel 31 and the workpiece 7 is consistent, thereby ensuring the quality of hot stamping. The constant pressure cylinder 36 and the connecting rod 35 can be directly or indirectly connected. To make the force more balanced, the two connecting rods 35 on the left side are fixedly connected at their middle positions by a longitudinal crossbeam. One end of the constant pressure cylinder 36 is connected to the middle of the longitudinal crossbeam, and the other end is connected to the cylinder mounting base 37. In some alternative embodiments, the constant pressure cylinder 36 may be connected to any of the connecting rods 35.

[0032] In some embodiments, the heating head base 33 may be fixedly mounted relative to the frame 1. To ensure that the constant pressure amplitude of the constant pressure cylinder 36 is within a certain range, this utility model preferably controls the travel of the piston rod of the constant pressure cylinder 36 to a small value (generally not exceeding 50mm). In order to better adapt to irregular workpieces (when their running trajectory differs greatly from the radial dimension of their rotation center), a further preferred embodiment of this utility model is that the upper surface of the heating head base 33 is equipped with a connecting rod limit switch 38 for controlling the left and right swing travel of the connecting rod 35 (i.e., there are two connecting rod limit switches 38, one for controlling the left swing travel and the other for controlling the right swing travel); the heating head base 33 is mounted on the heating head base mounting base 314 through the heating head screw nut moving pair, so that the heating head base 33 can move horizontally in the left and right direction relative to the heating head base mounting base 314; the heating head screw nut moving pair is equipped with a heating head screw drive motor 39, and the connecting rod limit switch 38, the constant pressure cylinder 36 and the heating head screw drive motor 39 are all electrically connected to the controller. During installation, the heating head base mounting base 314 is fixedly mounted on the frame 1. The heating head screw and nut moving pair is a conventional existing mechanism. More specifically, the heating head screw and nut moving pair includes a bottom slider 313 of the heating head base, which is fixedly mounted on the heating head base 33. The bottom slider 313 can move back and forth on the guide rail of the heating head base mounting base 314. A nut is provided on the bottom slider 313. A screw connected to the nut is rotatably mounted on the heating head base mounting base 314. The heating head screw drive motor 39 drives the screw to rotate, thereby moving the heating head base 33 left and right. When the linkage limit switch 38 is triggered, the controller confirms that the constant pressure cylinder 36 is fully compressed or fully extended. The controller outputs a command to drive the heating head screw drive motor 39 to rotate forward or reverse, causing the heating head base 33 to move a set distance (e.g., 30mm) in the left and right directions. During the entire hot stamping process, the pressure inside the constant pressure cylinder 36 is autonomously adjusted by the constant pressure valve 310.

[0033] In practical applications, workpiece 7 may not only have a non-circular extension trajectory. For example... Figure 2 The workpiece 7 shown (a column-type air conditioner top cover) has a hot stamping surface consisting of a hot stamping bevel 71, a hot stamping straight surface 72, and a hot stamping connecting angle 73 (i.e., a raised structure) between the two. The following defects will occur when using a traditional hot stamping machine: (1) The hot stamping foil cannot completely cover the hot stamping surface corresponding to the hot stamping connection corner 73, resulting in a white exposed defect; (2) When the workpiece with an irregular shape is dragged by the first drive mechanism, the radius of each point on the hot stamping trajectory will change, causing the tension on the hot stamping foil 6 to fluctuate, and wrinkles or cracks in the hot stamping surface may occur. (3) For any part of the hot stamping slope 71, the radius of its outer edge trajectory is greater than the radius of its inner edge trajectory. The hot stamping foil 6 naturally adheres to this hot stamping slope 71, and wrinkles will inevitably appear in the inner area, which cannot meet the usage requirements. If the hot stamping foil 6 is to be completely adhered to the hot stamping slope 71 without wrinkles appearing in the inner area, the hot stamping foil 6 needs to be stretched and deformed to a certain extent. The size of the deformation is controlled by the tension applied to the hot stamping foil 6. If the tension is unstable, the deformation of the hot stamping foil 6 will fluctuate, which will cause wrinkles or cracks in the hot stamping, which also cannot meet the process requirements.

[0034] Another key technical point of this utility model is that the output end of the foil feeding mechanism 2 is equipped with a foil buffer constant tension mechanism 8. The foil buffer constant tension mechanism 8 includes a foil buffer base plate 81, which is vertically fixed on the frame 1. A weighing sensor fixing seat 85 and a linear guide rail 89 are fixedly arranged on the front side of the foil buffer base plate 81. A weighing sensor 84 is fixedly arranged at the upper end of the weighing sensor fixing seat 85. The linear guide rail 89 extends vertically and is equipped with a fixed foil tensioning wheel seat 83 and a floating foil tensioning wheel seat 823 that move vertically. The fixed foil tensioning wheel seat 83 is located above the weighing sensor fixing seat 85. In the weighing sensor 84, the bottom end of the fixed foil wheel seat 83 presses against the probe of the fixed foil wheel seat 84. Multiple upper fixed foil wheels 82 are mounted on the front of the fixed foil wheel seat 83 at left-right intervals. The floating foil wheel seat 823 is located below the fixed foil sensor seat 85. Multiple floating foil wheels 825 are mounted on the front of the floating foil wheel seat 823 at left-right intervals. The foil feeding mechanism 2 is located on the left side of the foil buffer base plate 81. A tension motor 811 and a wire drum support 819 are fixed on the left side of the foil buffer base plate 81 below the foil feeding mechanism 2. A rotatably mounted wire drum 817 is mounted on the wire drum support 819. One end of the wire drum 817 is connected to the output shaft of the tension motor 811 via a torque transmission mechanism. This torque transmission mechanism includes a magnetic powder clutch 814. The input end of the magnetic powder clutch 814 is connected to the output shaft of the tension motor 811, and the output end of the magnetic powder clutch 814 is connected to the wire drum 817. The weighing sensor 84, the magnetic powder clutch 814, and the tension motor 811 are all electrically connected to the controller. A wire rope fixing seat 822 is fixedly installed at the left end of the floating foil wheel seat 823. A wire rope 821 is wound around the outer circumference of the wire drum 817. One end of the wire rope 821 is fixedly connected to the other end of the wire rope 821. One or more wire guide wheels 820 are fixedly connected to the wire drum support 819 (in the preferred embodiment shown in the figure, there are two wire guide wheels 820); the floating foil wheel seat 823 is equipped with a vertical stroke control mechanism. When the foil 6 led out from the foil feeding mechanism 2 alternately passes around the upper fixed foil wheel 82 and the floating foil wheel 825 from left to right and is in a preset tension state, the foil feeding mechanism 2 stops releasing the foil 6 (that is, it uses its own brake to achieve a braking state). The length of the foil 6 released by the floating foil wheel seat 823 from its lower end of its stroke to its upper end of its stroke is greater than the length of the foil 6 required for the foil 6 hot stamping of a workpiece 7.

[0035] In practice, the hot stamping foil 6 alternately wraps around the upper fixed foil roller 82 and the floating foil roller 825 from left to right. Specifically, the hot stamping foil 6 first wraps around the first upper fixed foil roller 82 located on the left, then around the first floating foil roller 825 located on the left, then around the second upper fixed foil roller 82 located on the left, then around the second floating foil roller 825 located on the left, then around the third upper fixed foil roller 825 located on the left, and so on, alternating to form multiple S-shaped wraps. Of course, in some embodiments, it may first wrap around the first floating foil roller 825 located on the far left, and then around the first upper fixed foil roller 82 located on the left. Similarly, after the hot stamping foil 6 has alternately wrapped around all the upper fixed foil rollers 82 and floating foil rollers 825 from left to right, it may be drawn out from the rightmost floating foil roller 825 or from the rightmost upper fixed foil roller 82. The specific number of the fixed foil roller 82 and the floating foil roller 825 can be determined by comprehensively considering the buffer length requirements of the hot stamping foil 6 and the overall reliability of the mechanism. Figure 4 In the preferred embodiment shown, four upper fixed foil rollers 82 and three floating foil rollers 825 are designed. The hot stamping foil 6 first passes around the first upper fixed foil roller 82 located on the left, and then passes around the first floating foil roller 825 located on the left. After alternating passes, the hot stamping foil 6 is led out from the upper fixed foil roller 82 located on the far right. Two linear guides 89 are generally symmetrically arranged. The linear guides 89 are equipped with vertically movable fixed foil roller seats 83 and floating foil roller seats 823. The fixed foil roller seats 83 and floating foil roller seats 823 can be slidably configured (i.e., using sliders) or rolled (slider combined with ball bearings, or using rollers). Figure 4 In the preferred embodiment shown, both the fixed foil wheel seat 83 and the floating foil wheel seat 823 are slidably configured using a linear slider 827.

[0036] In some preferred embodiments, a vertically extending rack 86 is fixedly disposed on the front side of the foil buffer base plate 81. A floating foil wheel seat anti-fall cylinder 824 with its axis arranged in the front-rear direction is mounted on the floating foil wheel seat 823. A rack engaging plate is fixedly disposed at the end of the piston rod of the floating foil wheel seat anti-fall cylinder 824. The rack engaging plate has a first state of engaging and fixing with the rack 86 and a second state of being separated from the rack 86. The rack 86 can generally be designed at the middle position between the two linear guide rails 89, and the length of the rack 86 can be designed according to the travel of the floating foil wheel seat 823. When a roll of hot foil 6 is used up, it needs to be refilled. The floating foil wheel holder anti-fall cylinder 824 is vented, and the rack and pinion plate extends and engages with the rack 86. At this time, the floating foil wheel holder 823 is fixed relative to the foil buffer base plate 81. After the replacement hot foil 6 is installed, the air intake of the foil wheel holder anti-fall cylinder 824 is closed, and the device returns to its original state. The rack and pinion plate is now in a second state, separated from the rack 86, which does not affect the up-and-down movement of the floating foil wheel holder 823. During the replacement of the hot foil 6, the floating foil wheel holder anti-fall cylinder 824 effectively prevents the floating foil wheel holder 823 from falling under gravity, facilitating the replacement of the hot foil 6. In some alternative embodiments, a fixed limiting member at the bottom of the linear guide rail 89 can also be used to prevent the floating foil wheel seat 823 from falling under the action of gravity. However, this solution can only replace the hot stamping foil 6 at a fixed point (the position corresponding to the fixed limiting member at the bottom of the linear guide rail 89), and may cause impact to the fixed limiting member, which is relatively inconvenient and unreliable.

[0037] In some preferred embodiments, a wire drum support 819 has a wire brake cylinder 818 mounted on one side of the wire drum 817. The axial direction of the wire brake cylinder 818 is arranged along the radial direction of the wire drum 817. A wire locking block 828 is fixedly provided at the end of the piston rod of the wire brake cylinder 818. The wire locking block 828 has a first state of pressing and fixing the wire rope 821 onto the wire drum 817 and a second state of being separated from the wire rope 821. When the machine is stopped and the power is cut off, the tension in the hot stamping foil 6 will drag the floating foil wheel seat 823 upward due to the de-energization of the magnetic powder clutch 814. At this time, the wire brake cylinder 18 is pre-operated to lock the wire rope 821 onto the wire drum 817, which can effectively prevent instantaneous impact.

[0038] The vertical stroke control mechanism of the floating foil wheel seat 823 can be implemented with reference to various existing displacement monitoring mechanisms. In order to make the structure simple and reliable, in some preferred embodiments, the vertical stroke control mechanism of the floating foil wheel seat 823 includes an upper limit switch 87 and a lower limit switch 88 of the floating foil wheel seat mounted on the foil buffer base plate 81. Both the upper limit switch 87 and the lower limit switch 88 of the floating foil wheel seat are electrically connected to the controller.

[0039] The magnetic powder clutch 814 is an existing complete set of equipment. To make the structure simple and reliable, in some preferred embodiments, the input end of the magnetic powder clutch 814 is connected to the output shaft of the tension motor 811 via a synchronous belt drive mechanism. More specifically, the output shaft of the tension motor 811 is equipped with a tension motor pulley 812, and the input end of the magnetic powder clutch 814 is equipped with a magnetic powder clutch input synchronous pulley 815. The tension motor pulley 812 and the magnetic powder clutch input synchronous pulley 815 are connected by a synchronous belt 813. The output end of the magnetic powder clutch 814 is connected to the wire drum 817 via a magnetic powder clutch torque output shaft 816. The two ends of the magnetic powder clutch torque output shaft 816 can be fixedly connected to the transmission object, or they can be connected using a conventional key connection. To protect the internal transmission structure, the magnetic powder clutch torque output shaft 816, the synchronous belt drive mechanism, and the magnetic powder clutch 814 are equipped with protective covers 826.

[0040] To ensure structural simplicity and reliability, in some preferred embodiments, the foil feeding mechanism 2 includes a foil feeding motor 21, a foil feeding mechanism fixing base 22, a foil loading rod 23, and a foil clamping component 24. The foil feeding motor 21 is fixedly connected to the foil buffer base plate 81 via the foil feeding mechanism fixing base 22. The foil loading rod 23 is drivenly connected to the output end of the foil feeding motor 21. The foil clamping component 24 is mounted on the foil loading rod 23. A foil guide wheel 810 is provided on the left side of the front of the foil buffer base plate 81. The hot stamping foil 6 led out from the foil clamping component 24 first passes around the foil guide wheel 810, and then alternately passes around the upper fixed foil wheel 82 and the floating foil wheel 825 from left to right. The foil guide wheel 810 can better control the direction and angle of the hot stamping foil 6, further facilitating the control of its tension. The foil clamping component 24 can generally be designed as two symmetrically arranged components, which play a limiting and fixing role at both ends of the width direction of the hot stamping foil 6. The foil clamping component 24 can be set on the foil loading rod 23 in a conventional detachable fixing method.

[0041] In some embodiments, a foil powder adsorption device 10 is installed on the left side of the workpiece rotating mechanism 5 in the frame 1. The foil powder adsorption device 10 includes a negative pressure suction hood covering the workpiece rotating seat. It is understood that the installation structure of the negative pressure suction hood should not affect the installation and operation of the workpiece 7. The negative pressure suction hood can effectively remove dust from the workpiece operating area, further ensuring the hot stamping quality.

[0042] In some embodiments, the frame 1 is equipped with a pre-foil pressing roller 11 and a post-foil pressing roller 12, so that the foil 6 led out from the foil feeding mechanism 2 passes sequentially through the foil buffer constant tension mechanism 8, the pre-foil pressing roller 11, the mating area between the workpiece 7 and the foil pressing roller 31, and the guide of the post-foil pressing roller 12, before being collected by the foil receiving mechanism 4; the pre-foil pressing roller 11 includes two foil pressing rollers arranged opposite each other, and the foil 6 passes between the corresponding two foil pressing rollers; the post-foil pressing roller 12 can also generally be designed as a pair of foil pressing rollers (or multiple pairs of foil pressing rollers) arranged opposite each other; the pre-foil pressing roller 11 is mounted on the frame 1 via a foil pressing moving mechanism, which includes a horizontal base plate 91 fixed relative to the frame 1, the horizontal base plate 91... A foil-pressing X-axis moving seat 92, capable of moving left and right, is mounted on the workpiece 7 via an X-axis lead screw and nut moving pair. A foil-pressing Z-axis moving seat 93, capable of moving up and down, is mounted on the foil-pressing X-axis moving seat 92 via a Z-axis lead screw and nut moving pair. The foil-pressing wheel 11 is mounted on the foil-pressing Z-axis moving seat 93 via a foil-pressing rod 94. The X-axis lead screw and nut moving pair is equipped with an X-axis lead screw drive motor 95, and the Z-axis lead screw and nut moving pair is equipped with a Z-axis lead screw drive motor 96. Both the X-axis lead screw drive motor 95 and the Z-axis lead screw drive motor 96 are electrically connected to a controller. The controller has a preset control program to automatically adjust the position of the foil-pressing wheel 11 based on the movement trajectory of the workpiece 7 via the X-axis lead screw drive motor 95 and the Z-axis lead screw drive motor 96. Referring to the foil-pressing head base 33 described above, the X-axis lead screw and nut moving pair and the Z-axis lead screw and nut moving pair involved in the foil-pressing moving mechanism are also conventional complete mechanisms. In practice, a sufficient number of points are taken along the movement trajectory of workpiece 7, and the corresponding parameters of each point are set in the process parameters in the memory of the controller. At different points, the X-axis lead screw drive motor 95 and the Z-axis lead screw drive motor 96 are controlled to work, and the position of the hot stamping foil roller 11 is automatically adjusted and controlled. This ensures that the hot stamping foil 6 is always in contact with workpiece 7 at a suitable angle, thereby ensuring that the hot stamping foil 6 is always covered on each section of the surface of workpiece 7, effectively guaranteeing the hot stamping quality.

[0043] In a preferred embodiment of this utility model, its overall operation is as follows: 1. Initial loading of hot foil 6: The hot foil 6 is clamped on the foil feeding mechanism 2, the free end of the hot foil 6 is pulled out, and it is wound according to the design path (foil guide wheel 810, multiple upper fixed foil wheels 82 and multiple floating foil wheels 825, hot foil pressing wheel 11 before hot foil gilding, the mating area between the workpiece 7 and the hot foil wheel 31, and hot foil pressing wheel 12 after hot foil gilding), and finally the free end is fixed on the foil taking-up mechanism 5; 2. Install workpiece 7 on workpiece rotating mechanism 5, and adjust the rotating angle of workpiece rotating mechanism 5 through controller so that workpiece 7 is in the initial position of hot stamping. 3. Manually operate the heating head screw drive motor 39 to move the heating head base 33 to the left, which drives the hot stamping wheel 31 to move to the left in sync until the hot stamping wheel 31 presses the hot stamping foil 6 onto the hot stamping edge of the workpiece 7 with the required clamping force. 4. This puts the output shaft of the foil-feeding motor 21 corresponding to the foil-feeding mechanism 2 in a braking state, at which point foil feeding cannot be performed; 5. Tension Formation: The foil buffer constant tension mechanism 8 is used to adjust the tension of the hot stamping foil 6 to a preset fixed value; the foil release motor 21 is in a power-off braking state, the tension motor 811 is energized, and a stable torque is formed through the magnetic powder clutch 814, thereby forming a constant tension on the hot stamping foil 6. 6. Manually control the X-axis lead screw drive motor 95 and the Z-axis lead screw drive motor 96 to make the hot stamping foil pressing wheel 11 in the preset initial position; 7. Start the workpiece running mechanism 5 and start automatic operation: During the hot stamping process, the workpiece 7 and the hot stamping wheel 31 press the hot stamping foil 6 in the middle. The hot stamping foil 6 has a certain tension, so that it is evenly covered on the surface of the workpiece 7. The rotational torque of the workpiece 7 during hot stamping overcomes the tension of the hot stamping foil 6 and pulls out the hot stamping foil 6. Since the foil feeding motor 21 is in the power-off braking state, the foil feeding function stops. Under the pull of the rotational torque of the workpiece 7, the floating foil feeding wheel 825 moves upward as a whole until the hot stamping of the workpiece 7 is completed. During the entire hot stamping process, the foil feeding action of the foil feeding motor 21 is not executed. The tension in the hot stamping foil 6 is not disturbed by the foil feeding and remains constant, ensuring that the hot stamping foil 6 is evenly covered on the surface of the workpiece 7 without wrinkles. 8. Automatic foil feeding: When a hot stamping cycle ends and workpiece 7 is picked up or placed, the foil feeding motor 21 starts working and releases the hot stamping foil 6 into the foil buffer constant tension mechanism 8. Under the drag of the tension motor 811, the floating foil feeding wheel 825 moves down until the floating foil feeding wheel seat 823 reaches the lower end of its stroke, at which point the foil feeding ends; the tension motor 21 continues to run to ensure that the tension in the hot stamping foil 6 is consistent with the given tension.

[0044] This invention uses a foil buffer constant tension mechanism 8 to buffer a sufficient amount of hot stamping foil 6. During the hot stamping process, the foil release mechanism 2 does not work (the disturbance is zero). The friction force between the workpiece 7 and the hot stamping wheel 31 pulls the hot stamping foil 6. When one hot stamping cycle is completed, during the process of the operator picking up and putting down the workpiece 7, the foil release mechanism 2 releases foil to the foil buffer constant tension mechanism 8. The foil release and hot stamping are always kept in a time-avoiding manner, which completely ensures the constant tension of the hot stamping foil 6 and eliminates the defects of hot stamping wrinkles and exposed white areas.

Claims

1. A hot stamping head mechanism for a hot stamping machine, comprising a hot stamping head base (32) and a hot stamping wheel (31), wherein the hot stamping wheel (31) is rotatably disposed on the left side of the hot stamping head base (32), and the hot stamping wheel (31) is equipped with a hot stamping wheel self-rotation drive mechanism for driving its rotation, characterized in that, The device includes a hair curling head base (33) and an upper fixed bracket (34). The upper fixed bracket (34) is fixedly connected to the right end of the hair curling head base (32). The upper fixed bracket (34) is located above the hair curling head base (33) and is connected to the hair curling head base (33) by four rectangular connecting rods (35). The ends of the connecting rods (35) are connected to the upper fixed bracket (34) and the ends of the connecting rods (35) are connected to the hair curling head base (33) by hinge pivots. The axis of the hinge pivots is arranged horizontally in the front-back direction. The middle part of the connecting rods (35) is connected to the cylinder fixing seat (37) on the hair curling head base (33) through a constant pressure cylinder (36). Both ends of the constant pressure cylinder (36) are connected to the corresponding connecting parts by hinge mechanisms. A constant pressure valve (310) is installed at the air inlet of the constant pressure cylinder (36). When the connecting rods (35) swing left and right, the constant pressure cylinder (36) can automatically extend and retract.

2. The hot stamping head mechanism for a hot stamping machine according to claim 1, characterized in that, The device includes a controller and a connecting rod limit switch (38) installed on the upper surface of the heating head base (33) for controlling the left and right swing stroke of the connecting rod (35). The heating head base (33) is mounted on the heating head base mounting base (314) through the heating head screw nut moving pair, so that the heating head base (33) can move horizontally in the left and right direction relative to the heating head base mounting base (314). The heating head screw nut moving pair is equipped with a heating head screw drive motor (39). The connecting rod limit switch (38), the constant pressure cylinder (36) and the heating head screw drive motor (39) are all electrically connected to the controller.

3. The hot stamping head mechanism for a hot stamping machine according to claim 1, characterized in that, The two connecting rods (35) on the left side are fixedly connected in the middle position by a longitudinal beam. One end of the constant pressure cylinder (36) is connected to the middle of the longitudinal beam, and the other end is connected to the cylinder mounting seat (37).

4. The hot stamping head mechanism for a hot stamping machine according to claim 1, characterized in that, The hot stamping wheel rotation drive mechanism includes a hot stamping wheel rotation motor (311) and a hot stamping wheel transmission belt (312). The output shaft of the hot stamping wheel rotation motor (311) is connected to the input shaft of the hot stamping wheel (31) via the hot stamping wheel transmission belt (312).

5. A hot stamping machine, comprising a frame (1) and a controller, wherein a foil feeding mechanism (2), a hot stamping head mechanism (3), a foil receiving mechanism (4), and a workpiece moving mechanism (5) are mounted on the frame (1); the workpiece moving mechanism (5) is located in the left side region of the hot stamping head mechanism (3), the workpiece moving mechanism (5) comprises a workpiece fixing base and a workpiece rotating seat, the workpiece rotating seat is rotatably mounted on the workpiece fixing base, and the workpiece rotating seat is equipped with a first driving mechanism for driving its rotation, the workpiece rotating seat is used to fix the workpiece (7), characterized in that, The workpiece fixing base is fixed relative to the frame (1), and the hot stamping mechanism (3) adopts the hot stamping mechanism for hot stamping machine as described in any one of claims 1, 3 and 4. The hot stamping base (33) is mounted on the frame (1), and the workpiece fixing base and the hot stamping base (32) can approach each other so that the hot stamping foil (6) drawn out from the foil feeding mechanism (2) can pass through the mating area between the workpiece (7) and the hot stamping wheel (31) and complete the hot stamping process.

6. The hot stamping machine according to claim 5, characterized in that, The upper surface of the heating head base (33) is equipped with a connecting rod limit switch (38) for controlling the left and right swing stroke of the connecting rod (35); the heating head base (33) is mounted on the heating head base mounting base (314) of the frame (1) through the heating head screw nut moving pair, so that the heating head base (33) can move horizontally in the left and right direction relative to the frame (1); the heating head screw nut moving pair is equipped with a heating head screw drive motor (39), and the connecting rod limit switch (38), constant pressure cylinder (36) and heating head screw drive motor (39) are all electrically connected to the controller.

7. The hot stamping machine according to claim 5, characterized in that, The frame (1) is equipped with a foil powder adsorption device (10) on the left side of the workpiece moving mechanism (5). The foil powder adsorption device (10) includes a negative pressure suction hood covering the workpiece rotating seat.

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